BIM-Based Educational and Facility Management of Large University Venues

: The aim of this paper was to provide a Building Information Modeling (BIM)-based management system for the Civil Engineering School (ETSICCP) at the Universidad Polit é cnica de Madrid with a long-term development perspective. A Building Information Modeling (BIM) management system for complex infrastructure facilities demands a detailed 3-Dimensional model according to future management requirements. In this study, the infrastructure of the ETSICCP was modeled on various phases and synchronized with not only external educational information but also with facility management (FM) parameters. The methodology followed in this study ranges from the blank paper to a BIM-based detailed FM system oriented to educational scheduling throughout the infrastructure providing real time information synchronized with spreadsheets and a 3-D model. The result of this paper provides multiples future management lines, like COVID-19 BIM-management or synchronization with local public transports’ applications (mainly metro and bus transport systems), through a public accessible Application Programming Interface (API). The signiﬁcance of this research relies on the generation of an information and management system, based on a BIM model of a university campus. This project was designed for all the agents involved in its operation, students, lecturers, and managers. All these agents have a level of access appropriate to their needs and functions within the institution.


Introduction
Building Information Modeling (BIM) is defined as a methodology of collaborative scope able to create an application environment that can host all the disciplines involved in a construction project with a great amount of information either ascribed or applicable to the different project stages, i.e., design, construction and service and maintenance management.
Under the concept of BIM multiple definitions are collected, such as the one given by ISO 29481-1:2010, which defines BIM as a digital representation of functionalities and characteristics of every built element. Most common research points BIM to a methodology of collaborative scope that hosts all disciplines and related information pertinent to a project development and the required execution phases. Each execution phase requires different types of information. This information can also be useful in future stages of the infrastructure life, using the BIM model as a tool for efficient management with accurate information [1] or even more considering possible future demolition phases [2,3]. This way, in any episode of the project life, a large amount of information is available due

Literature Review
The BIM model was focused on the infrastructure management of the ETSICCP. In this way, the BIM model needed to house a large amount of data [19][20][21] and to enable the provision of useful information related to updated drawings [3], quality control [27,28], space and energy management [19,29], or emergency situations [20]. Under this scope, BIM enhances its efficiency due to the incorporation of new technologies, like IoT, linking, and synchronizing with databases or 3-D scanning information ascribed to the model. Facing the synthesis of methodologies of such unequal nature, it gives rise to ontological problems based on the existing incompatibility of the generated information.

BIM and IoT Management
The development of this binomial status is an important feature to be implemented in the near future. The background records of the union of IoT and BIM models show notorious advantages in terms of infrastructure management based on different software developments [10]. The combination of BIM and IoT permits a large amount of real-time information to be available and this is the core of what is called Smart City [30,31]. Assuming Smart City to be an extension of Digital City, the main point of this concept is the digital environment. In such a sense, a BIM model synchronized with public transport systems, public parking or climate control applications provides the user with accessible information, not only about the infrastructure, but also about the Smart City in which it is integrated and in a homogeneous way.
Together, BIM and IoT shape a system synthesis applicable to all project phases with outstanding results, such as those shown for highway maintenance, by leveraging Big Data and BIM [32]. For the diffusion and application of this combined technology some common standards have been developed [10] with the goal of creating new beneficiaries of BIM, including the future occupants of the infrastructure who are unaware of the full potential of a useful operation of BIM information [33]. For that purpose, some standards have been developed in order to obtain different data types so that they are useful for future infrastructure management based on simple and intuitive interfaces [34].
The ETSICCP model contemplates the possibility of hosting IoT by means of sensor systems able to provide real time information to a database getting close to the concept of "Smart Building" [35] with great operation efficiency in terms of information handling [36,37] improving BIM information with real time data extremely important in special infrastructure, such as a Campus, airports, or even hospitals [38,39].

3-D Scanning
BIM usage is strongly associated with preconstruction phases, such as predesign, design, or even construction. However, new development points to postconstruction phases have appeared [2,3,19,[40][41][42]. Infrastructure management requires big volume of detailed data in order to achieve an efficient management system [1], making capture of data a critical step in order to achieve useful information for future managements based on standard frameworks for each management target [43].
If the capture of data supplies insufficient information for initial proposals, obtaining new complete data means large economic and time costs [20,[44][45][46][47][48]. To avoid this, data capture techniques are commonly used in existing building with the imaged-based or range-based techniques [4,49], usually executed with a laser scanner, standing out.
Given the progress of laser scanner methodology in the field of Cultural Heritage (CH) it has become an attractive alternative in order to create three-dimensional models from existing buildings or other constructed elements. Some remarkable cases are: the digital model of Pietá of Michelangelo Buonarrotti [50], the implement of a digital model of Nuestra Señora de los Desamparados [51], modeling of Minerva statue [52], the 3-D model of a Terracotta piece [53], and the elevation model of the lost ruins of the Coliseum in Rome [54]. This technology has been termed as Scan-to-BIM, and it is based on the process of capturing the main features and geometry of existing buildings or infrastructure in order to create a BIM model without any previous data. The most common technology used for this purpose is three-dimensional laser scanning.
A great deal of progress has been made by the use different scanning techniques developed in recent years, ranging from pure CH related techniques [55], focused on architectural, archaeological, and geological elevations [56], to more detailed ones, as well as aspects, such as point cloud processing [57], improvements of the optical triangulation [58][59][60], camera calibration as a function of the position [56,57], or the simplification of point-defined surfaces [61].
Highlighting the important evolution of the laser scanner as a source of information for BIM, research points to "scan-to-BIM" developments based on modeling the collected information in an automated way [4,47,[62][63][64].
The BIM model developed and herein reported was devised based on CAD information but this does not impede the future scanning of the building and the implementation to the model of the collected information. With the obtained data, point clouds and images will allow the verification of the initial CAD files and issue image patterns in the model useful for virtual internal routing.

BIM and Facility Management
The distinctive concept of this project fully contemplates the techniques and research developed under the denomination of Facility Management (FM) based on real applications of BIM management methodologies in special infrastructure facilities [38,39]. The set-up of the 3-D model is considered as the database element in which the FM tools will be developed [65,66]. Although the number of tools referred to the infrastructure management database stands out, there are also great advantages in the implementation of BIM tools at earlier phases [67,68]. The inter-operability between different data sources, independently of the original stage or phase [68], is the main objective in the standard development, either for modeling or for the information management itself [69], thereby reducing the typical inter-operation framework in the construction industry [70].
The reason for the existence of the FM tools is based on completing the voids existing between BIM and the infrastructure management [71], providing a much more efficient methodology for building management [5,72]. Many compilations of FM techniques [73] or simple guidelines for different disciplines or involved entities improve the implementation of BIM in management stages [74,75].
The scope for this research in terms of application of FM tools is based on the Computer Aids Facility management (CAFM) with software tools in fields, such as firefighting [76], energy management [77], or real visualization and interaction with the model [78].

Educational Management in Universities
The management of university campuses differs depending on the nature of the institution. The infrastructure of this paper is considered a public institution facility. Thus, previous research published dealing with public infrastructure managements was gathered in this literature review.
Several publications have studied the management of important public institutions focusing on the FM and highlighting the importance of this. Jensen, in 2011 [79], argued that, while core business should add value to external customers, FM must create value for internal customers by supporting the core business. Another definition of FM is detailed by the Corporate Real Estate [80], assuming it to be an act of aligning the services with the main purpose of the infrastructure.
The exploitation and maintenance of facilities are considered to be the second largest cost of universities, ranging between 5-15% in Europe [81]. Various studies indicate that university facilities are designed with large capacity spaces but their utilization rates remain only within a range of from 20 to 40% [82][83][84][85]. Moreover, most university facilities in Europe were built in the 1960s and the 1970s, resulting in poor technical conditions with outdated designs for 2020.
Smart Campus is the main goal in terms of modern universities. The process comprises of three stages: traditional campus, e-campus, and digital campus as the final phase [86]. The traditional campus is based on a classical management where students and faculties need to meet face to face to share content. Related to FM, the traditional campus mainly relies on paper formats to manage spaces or other facilities in the whole campus. To reach the e-campus phase, the use of internet to disseminate the material to be learned should be widespread [86,87]. Digital campus demands a technical environment with IoT, mobile terminal accessing, radio frequency identification (RFID), and cloud computing.
In this context, this paper details the firsts steps to be taken at the ETSICCP and the UPM to approach the digital campus environment, employing BIM together with the technologies cited previously.

Methodology
The staff and teaching facilities of the Civil Engineering School (Escuela Técnica Superior de Ingeniería de Caminos, Canales y Puertos in Spanish) were moved in 1968 to the present infrastructure within the UPM Campus that today hosts these engineering studies. For more than 50 years, the infrastructure has experienced several changes inside the building, mainly in the use of classrooms and other spaces. These changes, along with the room geometry changes for change of use purposes, have not been recorded or documented. This situation is hardly plausible with a BIM model. The goal for developing this BIM model is to issue a useful tool for the school management, not only in terms of modifications records [3] but also for the rational use of spaces [19,29]. The idea of unifying static information (classroom capacities, existing connections, and fixed equipment) and dynamic information (such as lecture sessions or locker assignments) into the one database allows for totally accessibility for the staff personnel in charge of the ETSICCP management. However, developing a new management methodology implies some risks. New management not only needs to be more efficient than its predecessor, but it must also be developed by the same professional staff. With this idea as a starting point, the complexity and magnitude of the infrastructure also increments the mentioned risk. In this project, a total area of 38,971 m 2 was considered. More than 50 teaching rooms, 21 laboratories, and more than 4000 students are managed. This building hosts two doctoral programs, five master's degrees, and two bachelor's degrees. The school is one of the oldest civil engineering schools in the world, declared 5th by the Academic Ranking of World Universities 2020 in the field of Civil Engineering [100]. In this context, the BIM-based methodology developed in this study brings additional profits:

BIM-EDU Project
The development of the above cited 3-D BIM model of the ETSICCP has its origin in a broader project called BIM-EDU. The BIM-EDU Project objective is the production of a 3-D model of ETSICCP located in the campus of UPM and enables the integration of all the information of interest for the management staff for the use of the buildings or for educational purposes. This BIM model will help the management staff of the school, will improve the academic life of students, will make the teaching work of the lecturers easier, and will integrate the work of the Service and Administration Personnel (PAS).
The project involves a team of students from the module Smart Construction which is part of the master's degree in Civil Engineering. Said students were also working on their Final Master Thesis (TFM). The objective is to provide a solution that firstly satisfies all the real needs of this academic institution and serves as good training for the developers providing innovative proposals, thereby improving the quality of teaching. It is, therefore, a project consisting of several stages, starting with collecting information and generating a large amount of information that would grow or be reduced depending on the stage. The BIM-EDU Project was developed as a Design-thinking initiative [101].
BIM-EDU project could be divided in two main points, as seen in Figure 1: Infrastructure Modeling and BIM-based FM. Infrastructure modeling housed not only its own model creation but also collected all the retrieving information system. Thus, BIM-based FM included the infrastructure information flow through BIM model to final users.

Modeling and Management
The methodology adopted for the execution of this project consisted of several phases defined in the BEP in which different aspects were addressed together and resulted in one efficient model Appl. Sci. 2020, 10, 7976 7 of 28 based on BIM methodology. This project was focused on research and the development of an efficient BIM management methodology, only the main points related to UNE-ISO 19650-1 [25] and UNE-ISO 19650-2 [26] being considered. Asset Information Requirements (AIR) and Project Information Requirements (PIR) were also detailed in BEP. Given the nature of this project, other points, such as a responsibility matrix or Organization Information Requirements related to legal issues, were not considered. The phases were independently developed by having temporal coincidence, as is shown in Figure 2.

Modeling and Management
The methodology adopted for the execution of this project consisted of several phases defined in the BEP in which different aspects were addressed together and resulted in one efficient model based on BIM methodology. This project was focused on research and the development of an efficient BIM management methodology, only the main points related to UNE-ISO 19650-1 [25] and UNE-ISO 19650-2 [26] being considered. Asset Information Requirements (AIR) and Project Information Requirements (PIR) were also detailed in BEP. Given the nature of this project, other points, such as a responsibility matrix or Organization Information Requirements related to legal issues, were not considered. The phases were independently developed by having temporal coincidence, as is shown in Figure 2. The overall process is comprised of the following stages: (a) Modeling stage: was the longest phase because of the size of the infrastructure. This phase was sub-divided to improve efficiency depending on the degree of detail to be incorporated into the final result. The following parts of the single file of the BIM model were distinguished: (b) Base Model: in charge of modeling the infrastructure skeleton. In this phase, the recorded detail quality was low. The single BIM model file for this phase houses modeling based on common architectural elements, such as walls, floors, windows, or roofs. (c) Detailed model: it considered specific elements that allowed the differentiation and identification of the infrastructure. In this phase, the BIM model file starts to house unique components, such as lockers, desks, projectors, pictures, or textures that were modeled in detail separately, and inserted to the file with the complete infrastructure model afterwards. (d) Stage for data assignments to the model: was given 40-day duration and will take place simultaneously with the previous stage. A database is compiled using spreadsheets in which all the time-schedules of the 2019-2020 academic year are filled in for each of the two degrees and four masters. The database is compiled for each of the cited degrees and for each of the student groups and covers all the teaching offer in this School. (e) Synchronization stage: this stage required the completion of the previous stages. Some possible occasional modifications or improvements could be made in the database, though continuous modifications in this stage would not be acceptable. (f) Drafting stage: as in the previous stage, the wording and documentation of the Project is to be made after all preceding activities are finished, so that the results in terms of benefits and inconveniences of the modeling and methodology are incorporated.
As shown in Figure 3, the longest stages were the specific modeling and the data assignment stages due to the character of the infrastructure. With respect to stage simultaneity, the ones for data collection and assignment stand out. Contrarywise, the base model phases had a low simultaneity because subsequent activities are required. In addition, the synchronization stage had a low percentage of simultaneity. This was caused by the need of having a database structure and a set-up model in order to keep synchronization between model and data when a change is made. The overall process is comprised of the following stages: (a) Modeling stage: was the longest phase because of the size of the infrastructure. This phase was sub-divided to improve efficiency depending on the degree of detail to be incorporated into the final result. The following parts of the single file of the BIM model were distinguished: (b) Base Model: in charge of modeling the infrastructure skeleton. In this phase, the recorded detail quality was low. The single BIM model file for this phase houses modeling based on common architectural elements, such as walls, floors, windows, or roofs. (c) Detailed model: it considered specific elements that allowed the differentiation and identification of the infrastructure. In this phase, the BIM model file starts to house unique components, such as lockers, desks, projectors, pictures, or textures that were modeled in detail separately, and inserted to the file with the complete infrastructure model afterwards. (d) Stage for data assignments to the model: was given 40-day duration and will take place simultaneously with the previous stage. A database is compiled using spreadsheets in which all The graph also shows both duration periods and task simultaneity referring to the project execution by a single person. This graph would show big changes depending on the number of professionals involved, thereby obtaining an optimum simultaneity curve where the objective consists of increasing the task simultaneity, improving the efficiency, and reducing total task time.
The efficiency increase can be exemplified in the base model stage. The simultaneity of the execution at this stage by a single person is zero. However, this simultaneity can still be increased by a large percentage by making task batches, that is, the base modeling could be divided into sub-stages, such as levels and grids, façade modeling, or door type modeling, all with the objective of creating independent tasks that allow simultaneous work of several persons and so reducing the total execution time. CAD and BIM software must be checked. Moreover, BIM software model demands independent CAD information at a high level thus a restructuring of CAD information was developed to achieve the correct insertion of CAD data into BIM environment.
Once CAD information was restructured, it was necessary to create an appropriate level in BIM environment. Moreover, CAD information available only referred to floor plant and sectional dimensions, and were taken in situ, to provide real height to BIM levels completing BIM requirements of Flow chart.
Relating BIM to CAD data link, it was necessary to insert each CAD information and align it according to geometric infrastructure properties individually. Once it has been done, the modeling phase starts.

Case Study
In order to reach the main objectives of the case study shown in this paper, two main aspects were addressed. The first one was related to the infrastructure modeling and the development of the 3-D model of the ETSICCP. The second challenge was the implementation of the adequate tools for the management of the infrastructure through use of the BIM model of the building.

Main Characteristics of the ETSICCP
The total area modeled for the ETSICCP was 38,970.84 m 2 . Regarding the useful area, it was 32,631.23 m 2 . The most outstanding were 26 and 27 as shown in Table 1. ETSICCP is used by more than 4000 students of different degree levels: Graduate, Master, and Ph.D. These figures give the idea of the magnitude of the school facilities as well as the excellent opportunity of implementing new management approaches for spaces, maintenance equipment and the relation with the staff, being aware of the impact that can be generated by a BIM methodology implementation. Table 1 shows the useful area of all the classrooms, with a total surface of 5,289.329 m 2 . The table was originated from the BIM model by making a constant relationship between the model and either a spreadsheet or any SQL database, so that any information in the model can be reflected instantly in the database and vice-versa.

Starting Documentation
The starting point of the modeling stage after the development of BEP is based on documentation in 2-D CAD format. The files did not have a specific date of expedition and possibly included elements that were not updated at the time of the model development. In turn, the received documentation consisted of plan drawings of the building floors at different levels but contained no section or elevation drawings nor aspects such as the floor height or the distance to the false ceilings. The option was to plot the geometry information and make in-place measurements of the missing data.

CAD-BIM Linking
With the existing and enhanced information, the modeling with BIM methodology started using BIM modeling Software. The modeling of different typologies of infrastructure not only differs in the construction typology but also in the used software and the workflow, which must be adapted according to the available tools. In this case, and with the described initial conditions, the option was to import files in CAD format referring to the plan views of ten different floor levels having previously preceded to the required drawing separation.
The used procedure and the methodology of execution are depicted in Figure 3. Firstly, a CAD data revision must be done searching for possible geometric infrastructure data omission or mistakes.
CAD and BIM software must be checked. Moreover, BIM software model demands independent CAD information at a high level thus a restructuring of CAD information was developed to achieve the correct insertion of CAD data into BIM environment.
Once CAD information was restructured, it was necessary to create an appropriate level in BIM environment. Moreover, CAD information available only referred to floor plant and sectional dimensions, and were taken in situ, to provide real height to BIM levels completing BIM requirements of Flow chart.
Relating BIM to CAD data link, it was necessary to insert each CAD information and align it according to geometric infrastructure properties individually. Once it has been done, the modeling phase starts.

Case Study
In order to reach the main objectives of the case study shown in this paper, two main aspects were addressed. The first one was related to the infrastructure modeling and the development of the 3-D model of the ETSICCP. The second challenge was the implementation of the adequate tools for the management of the infrastructure through use of the BIM model of the building.

Main Characteristics of the ETSICCP
The total area modeled for the ETSICCP was 38,970.84 m 2 . Regarding the useful area, it was 32,631.23 m 2 . The most outstanding were 26 and 27 as shown in Table 1. ETSICCP is used by more than 4000 students of different degree levels: Graduate, Master, and Ph.D. These figures give the idea of the magnitude of the school facilities as well as the excellent opportunity of implementing new management approaches for spaces, maintenance equipment and the relation with the staff, being aware of the impact that can be generated by a BIM methodology implementation.  Table 1 shows the useful area of all the classrooms, with a total surface of 5,289.329 m 2 . The table was originated from the BIM model by making a constant relationship between the model and either a spreadsheet or any SQL database, so that any information in the model can be reflected instantly in the database and vice-versa.

Internal and External Modeling
Thanks to the starting documentation and its adaptation to the new software, the modeling of each level could be carried out independently, starting with the floor system modeling and proceeding with the internal and external partitions modeling associated with each level. This phase was of great importance due to the geometrical character that the wall components give to the infrastructure. Internal and external, or façade, walls determine the skeleton of the internal and external infrastructure affecting the multiple component properties required by the space management.
In view of the possibilities of using the model by the School staff for its own management based on BIM technology, the modeling followed the guidelines established by the developed BEP, thereby allowing for a context and management standards. As a matter of example, Table 2 shows the naming of various types of components in the model. The modeling of the objects associated to each of the floor systems, as well as internal and external walls, was included in the base modeling stage described above with a very low percentage of simultaneity with respect to other stages. The required engagement for developing this stage was of great relevance for the whole Project.
The involved objects included in this base model contained some peculiarities that must be recognized, mainly in the modeling of walls. As commented in previous sections, the modeling was organized level by level and this procedure was of critical importance due to the particularities of the "wall" components. The initial temptation is to model walls, especially façades, considering the total height that a façade wall creates as beginning at level 0 and ending at level 3. Modeling with this methodology will lead to errors in terms of material measurements at a level. The origin of this error is the BIM software for wall accounting, that is, if a reform is intended partially affecting to level 2 of the infrastructure, the wall starting at level 1 through level 3 will not be accounted for. In order to have it accounted for by the software, the modeling must be organized level by level, which means having the façade modeled in several walls, one from level 0 to level 1, next from level 1 to level 2, and a third one from level 2 to level 3. In this way, the accounting will be exact, independently of the level at which the data is filtered.
With the objective of supplying the university with a model that can be used not only for space management but also for budgeting future reforms or changes in the infrastructure, modeling has been done according to the described methodology to avoid the cited errors. This is of key importance, as shown in the following case, where the error in quantities and budget of a partial reform in the ETSICCP was shown. The reform is supposed to affect only the first floor, which is level 1. The rehabilitation of the corridors close to classrooms 26 and 27, as shown in Figure 4, is intended. Shaded in blue in Figure 3, the walls affected by this reform are highlighted. In terms of location, the affected wall is similar in level 0 and level 1, having an end in level 2, so that if the wall has been modeled from level 0 through level 2, wrong modeling occurs, as is shown in Figure 5. When the data is filtered by the level and the acting zone, this wall will not be reflected in the quantities list. An example of quantities and budget with a wrong modeling is shown in Table 3. The unit price adopted for the reform is the one proposed by the official Price Generator of Madrid Community. Figure 3, the walls affected by this reform are highlighted. In terms of location, the affected wall is similar in level 0 and level 1, having an end in level 2, so that if the wall has been modeled from level 0 through level 2, wrong modeling occurs, as is shown in Figure 5. When the data is filtered by the level and the acting zone, this wall will not be reflected in the quantities list. An example of quantities and budget with a wrong modeling is shown in Table 3. The unit price adopted for the reform is the one proposed by the official Price Generator of Madrid Community.   Thanks to the correct modeling in the above described way, the quantities and budget are substantially different, as it is shown in Table 4. Comparing both modeling alternatives, the error affecting walls modeled in several levels can be clearly appreciated. This error can lead to significant cost differences, as shown in Figure 6.  Thanks to the correct modeling in the above described way, the quantities and budget are substantially different, as it is shown in Table 4. Comparing both modeling alternatives, the error affecting walls modeled in several levels can be clearly appreciated. This error can lead to significant cost differences, as shown in Figure 6. Comparing both modeling alternatives, the error affecting walls modeled in several levels can be clearly appreciated. This error can lead to significant cost differences, as shown in Figure 6.

Generation of Spaces
This is a part of the stage for assigning data to the model. It features the works of basic modeling of the floor systems and internal walls. Before the beginning of this phase, the spaces already exist in the model. Nevertheless, they have no properties. Thanks to the room component created, the spaces were given characteristics, and it was possible to assign them some properties that will be fundamental for management.
There are multiple properties that can be attributed to the School spaces. Some of them, like area, volume, and location, referring to the floor level, are automatically created. This real information can be filtered and made exportable to databases.
There is the chance of manually expanding the assignment of data related according to the requirement of the teaching institution. Some examples of new parameters developed and incorporated to the model are: (a) Department: to which the space belongs. (b) UPM Code: alphanumeric character string that the UPM uses to register all the spaces owned by the University. (c) Available connections: with this parameter the connections available to the classroom are assigned for teaching purposes. Some of the properties of this parameter are the existence of Computer USB ports, the type of computerized system, and version which are installed, computer available and its properties, type of video projector, etc. (d) Classroom occupation: this parameter is used to control the actual occupancy of the space and can be modified according to the nature of the activity occurring in the space. It provides information on the available seat number for a conventional class or for examination purposes. The parameter can be assigned due to the introduction of the typical seat bench units of the School, shown in Figure 7. By making an independent object for this case it is possible to increase the control capacity of these elements and also assign properties to the seat benches, such as functional state or the above mentioned UPM code.
Thanks to these new parameter designs and their properties, it was possible to elaborate data sheets as the one shown in Figure 8, referring to each of the classrooms where the main properties are depicted. These data sheets will be very useful for the teaching personnel and for the management staff. As a matter of sample, a data sheet is shown. It is worth noting the linking of it with the model because any change in the BIM model will be instantly reflected in the affected data sheet. That information transference is made possible due to the use of spreadsheets connecting the BIM model and the data sheets.
can be modified according to the nature of the activity occurring in the space. It provides information on the available seat number for a conventional class or for examination purposes. The parameter can be assigned due to the introduction of the typical seat bench units of the School, shown in Figure 7. By making an independent object for this case it is possible to increase the control capacity of these elements and also assign properties to the seat benches, such as functional state or the above mentioned UPM code. Thanks to these new parameter designs and their properties, it was possible to elaborate data sheets as the one shown in Figure 8, referring to each of the classrooms where the main properties are depicted. These data sheets will be very useful for the teaching personnel and for the management staff. As a matter of sample, a data sheet is shown. It is worth noting the linking of it with the model because any change in the BIM model will be instantly reflected in the affected data sheet. That information transference is made possible due to the use of spreadsheets connecting the BIM model and the data sheets.

Modeling of Special Elements
The modeling of this stage sometimes refers to very particular elements located in the infrastructure interior providing a greater precision considering the relevance of this outstanding part of the building above the pure space management.
Among the elements to be modeled in a very detailed way due to their singularity, Figure 9 shows that the roof of the School Library, the "noble zone" containing the main dependencies of the School and the big classrooms 26 and 27 stand out.

Modeling of Special Elements
The modeling of this stage sometimes refers to very particular elements located in the infrastructure interior providing a greater precision considering the relevance of this outstanding part of the building above the pure space management.
Among the elements to be modeled in a very detailed way due to their singularity, Figure 9 shows that the roof of the School Library, the "noble zone" containing the main dependencies of the School and the big classrooms 26 and 27 stand out.
The modeling of this stage sometimes refers to very particular elements located in the infrastructure interior providing a greater precision considering the relevance of this outstanding part of the building above the pure space management.
Among the elements to be modeled in a very detailed way due to their singularity, Figure 9 shows that the roof of the School Library, the "noble zone" containing the main dependencies of the School and the big classrooms 26 and 27 stand out.

BIM-Based Educational Management
The development of a BIM-based FM methodology is based on a correct identification of the infrastructure real needs which in turn will depend on the service to be performed. This Project has an educational scope where an efficient management is very important. An educational infrastructure contains multiple variables that traditionally have been considered independently. In the manner that BIM has meant a breakthrough in terms of infrastructure design because it can unify and combine different disciplines in a single model, in the management field this situation is quite similar. Thanks to the creation of the BIM model it is possible to integrate the totality of the management systems normally used in the School in an independent way. This situation can be exemplified by the locker management and classroom occupation, normally managed in parallel without mutual connections. Thanks to the BIM model and the considerations assumed at the modeling stage it is possible to have a common management system based on the BIM model, by considering parameters which have never been considered before in independent management, for example, the proximity of the student locker to his classroom.
The developed model boasts the capacity of acquiring new properties and enhancing the model by hosting a greater amount of information that can even be much more specific, like the maintenance of the classroom projector, assigning parameters, such as the maintenance revision periods or detected incidences. The availability of the BIM model also provides the possibility of putting together the maintenance of the cleaning equipment and activities with the occupation periods of classrooms or other spaces subjected to timing usage or occasional events.

Synchronization of BIM Model and Teaching Schedules
The classroom occupation in the teaching time is the first goal of this Project for establishing a global management model based on BIM methodology. In turn, this methodology is based on the compilation of data for further selected assignment and visualization of information by the use of spreadsheets that allow linking with the BIM model by means of the Software Navisworks that has a total linking with the BIM software tool used for modeling.
The cited database contains a great deal of information due to the wide range of studies offered in the School infrastructure. The data reflects the classroom occupation for all groups and semesters of the following studies: The hierarchical process for completing the final database to be synchronized is shown in the following diagram in Figure 10. The process starts with the compilation of the time schedules as included in the Teaching Guidelines of the different offered studies. This time schedule called "General Week" reflects the timing for each day of the week generically, with no allusion to the exact date or the specific classroom.
Then the data is independently considered for each of the studies, semesters, and groups. This step is of vital importance due to the large volume of the final database. By separating the information, the chance of error is less and it increases the chance of quick detection of possible inconveniences when trying to synchronize the data with the model.
The generation of the teaching calendar consists of giving a specific date to each of the subjects, that is, transforming the information structure from a generic weekday to a specific weekday. The volume of data in the spreadsheet referring to a generic timetable is only 6.8% of the final timetable with the total days of the week. The generation of this timetable is done with programming formulation included in the spreadsheet.
Finally, the exportation of the spreadsheets was realized by means of a Comma Separated Value (.CSV) format as required by the worksheet software used. In addition, a Macro routine is developed in order to automatize the process of semester generation and data exportation and make the updating process by the School staff easier. The aspects contemplated in the Macro are orange-shaded in the above diagram.
Thanks to the existence of the cited database, it is possible to extract precise data. This can be seen in Figure 11, where the timetable required for the first academic year is shown. This data can be synchronized with the BIM model, and, in this way, it is possible to graphically show the location of the different teaching hours for each grade. Additionally, the possible connection of IoT with the model allows the incorporation of real-time information and gives a permanent updating of the database. IoT in BIM entails real time data information. The data flow starts from IP video cameras, counting entrances and exits of people from each room, as well as reporting humidity and temperature, by sending the captured data to the SQL database, which is in constant synchronization The process starts with the compilation of the time schedules as included in the Teaching Guidelines of the different offered studies. This time schedule called "General Week" reflects the timing for each day of the week generically, with no allusion to the exact date or the specific classroom.
Then the data is independently considered for each of the studies, semesters, and groups. This step is of vital importance due to the large volume of the final database. By separating the information, the chance of error is less and it increases the chance of quick detection of possible inconveniences when trying to synchronize the data with the model.
The generation of the teaching calendar consists of giving a specific date to each of the subjects, that is, transforming the information structure from a generic weekday to a specific weekday. The volume of data in the spreadsheet referring to a generic timetable is only 6.8% of the final timetable with the total days of the week. The generation of this timetable is done with programming formulation included in the spreadsheet.
Finally, the exportation of the spreadsheets was realized by means of a Comma Separated Value (.CSV) format as required by the worksheet software used. In addition, a Macro routine is developed in order to automatize the process of semester generation and data exportation and make the updating process by the School staff easier. The aspects contemplated in the Macro are orange-shaded in the above diagram.
Thanks to the existence of the cited database, it is possible to extract precise data. This can be seen in Figure 11, where the timetable required for the first academic year is shown. This data can be synchronized with the BIM model, and, in this way, it is possible to graphically show the location of the different teaching hours for each grade. Additionally, the possible connection of IoT with the model allows the incorporation of real-time information and gives a permanent updating of the database. IoT in BIM entails real time data information. The data flow starts from IP video cameras, counting entrances and exits of people from each room, as well as reporting humidity and temperature, by sending the captured data to the SQL database, which is in constant synchronization with the BIM model. With all databases available in terms of use, the linking of the information with the BIM model can be carried out. The linking unit between the database and the model is the name of the spaces, that is, the classroom name. It is of key importance to succeed with the linking to have identical identification words of the classrooms in the database and in the BIM model. This way the automatic linking is obtained for each task, that is, for each class with the corresponding room identification and location in the model, thanks to the classroom name. For the described synchronization process in this paper, teaching schedule was considered. Thus, it must be considered that the synchronization process was variable depending on the information required to be synchronized with the BIM model.
The incorporation of the teaching calendar can result in a Gantt Diagram, in which each activity means a given lesson, shown in Figure 12. It is worth noting that the origin of Gantt Diagrams is for construction activities which normally have a duration of days. In our case, the class duration is a few hours maximum and this makes the Gantt Diagram very long in comparison to the ones normally used in construction works.
The structure used in the teaching visualization of the model is made by establishing shades of different colors depending on the offered grades, the visualization is shown in Figure 12. Of course, these criteria can be modified depending on the future needs of the School.

Synchronization of the Lockers
The management of an educational infrastructure encompasses various aspects in addition to classroom management. The physical properties of this building characterized by its large extension makes it even more important to have one efficient and complete management beyond the pure educational aspects. The school has several cleaning teams, some of them working in the evening and some at night, as well as maintenance personnel for computer equipment and for mechanical and electrical equipment of heating and air conditioning, among others. The enriching of the model and the incorporation of assigned information over time will continue to develop different management methodologies. This Project, in addition to setting-up some criteria for classrooms, also includes a specific system for locker management, as is shown in Figure 13. The methodology proposed for the locker management of the infrastructure is based on the linking in real time between a database consisting of spreadsheets and a BIM model. By this methodology, a student register is made for a specific locker, and the model would recognize the student particularities and retrieve the information about the locker positioning or distance to the student classroom.
The communication process between the database and the BIM model is exemplified in Figure 13. The process starts with the generation of some parameters in the BIM model, and then they are assigned to the corresponding objects. In this case, study the parameters are the ones referring to the locker owner, the rental period, and the student register and Identity Card. The naming at both sides, that is, in both the model and the database, must be identical; otherwise, the system will not be able to show the information included in the database. The methodology proposed for the locker management of the infrastructure is based on the linking in real time between a database consisting of spreadsheets and a BIM model. By this methodology, a student register is made for a specific locker, and the model would recognize the student particularities and retrieve the information about the locker positioning or distance to the student classroom.
The communication process between the database and the BIM model is exemplified in Figure  13.
The process starts with the generation of some parameters in the BIM model, and then they are assigned to the corresponding objects. In this case, study the parameters are the ones referring to the locker owner, the rental period, and the student register and Identity Card. The naming at both sides, that is, in both the model and the database, must be identical; otherwise, the system will not be able to show the information included in the database.
The linking in real time of the database and the BIM model is achieved by means of Dynamo programming that allows the possibility of detecting the database, reading the information and The linking in real time of the database and the BIM model is achieved by means of Dynamo programming that allows the possibility of detecting the database, reading the information and assigning it to the pertinent object. The communication is bi-directional so that the modifications made in the model are automatically reflected in the database, and vice-versa. Dynamo permitted the synchronization of the locker information in datasheets with the model. Some further programming by means of C# and python was performed in order to synchronize other features of the model.
The original idea of the locker management is based on the filling of the database by the competent staff personnel of the school but there are modifications leading to a higher efficiency of the system thanks to the database used. The spreadsheet used for the locker registration can be connected to a web environment accessible to all students, thereby allowing on-line registration that is in real time and instantly reflected in the BIM model.

3-D Scanning
Scanning technology applications are commonly applied in BIM methodologies, mainly in the existing infrastructure management. As is mentioned in present and future developments of BIM point of this paper, 3-D Laser Scanning is the most common tool in terms of capturing data for BIM modeling purposes, thus the main applicable sector is for already existing infrastructure built with no BIM information providing owners and managers with a building BIM model.
The application of 3-D Scanning technology is not conventional for this developed project of the ETSICCP. While the Scanning should have been implemented before the modeling phase in order to obtain a cloud of points as a modeling base, the BIM ETSICCP took CAD information as the first stone for the BIM model. by means of C# and python was performed in order to synchronize other features of the model.
The original idea of the locker management is based on the filling of the database by the competent staff personnel of the school but there are modifications leading to a higher efficiency of the system thanks to the database used. The spreadsheet used for the locker registration can be connected to a web environment accessible to all students, thereby allowing on-line registration that is in real time and instantly reflected in the BIM model.

3-D Scanning
Scanning technology applications are commonly applied in BIM methodologies, mainly in the existing infrastructure management. As is mentioned in present and future developments of BIM point of this paper, 3-D Laser Scanning is the most common tool in terms of capturing data for BIM modeling purposes, thus the main applicable sector is for already existing infrastructure built with no BIM information providing owners and managers with a building BIM model.
The application of 3-D Scanning technology is not conventional for this developed project of the ETSICCP. While the Scanning should have been implemented before the modeling phase in order to obtain a cloud of points as a modeling base, the BIM ETSICCP took CAD information as the first stone for the BIM model.   Leica systems provide an adjustable cloud of points. For this project, the cloud was upgraded with real UTM coordinates taken by the Topography department of the ETSICCP. Once UTM coordinates are registered, the UTM coordinate is assigned to different points of the cloud, and the Leica software system automatically autocorrects the position of the total cloud of points, locating all the infrastructure in a real placement. With this implementation, we open the path of incorporating the ETSICCP infrastructure to developed technologies, like Google maps, joining street view with internal infrastructure paths. Leica systems provide an adjustable cloud of points. For this project, the cloud was upgraded with real UTM coordinates taken by the Topography department of the ETSICCP. Once UTM coordinates are registered, the UTM coordinate is assigned to different points of the cloud, and the Leica software system automatically autocorrects the position of the total cloud of points, locating all the infrastructure in a real placement. With this implementation, we open the path of incorporating the ETSICCP infrastructure to developed technologies, like Google maps, joining street view with internal infrastructure paths.

Discussion
Public institutions make efforts to improve the quality and efficiency of their management. Even traditional techniques based on paper formats are used in many cases. Little improvements implementing technologies, such as identification systems or real time data, have been carried out in the previous years. This BIM-FM system is available and accessible for all infrastructure staff and users. A single management system allows managing rooms, equipment, or climatic conditions. It should be mentioned that the sensors to monitor temperature, humidity and occupation are not still placed in all the rooms, though the BIM-FM has been designed to do so and supports this possibility. This has been achieved and checked through prototypes and the overall implementation depend on future investments of the university. BIM-FM has also solved other problems, such as the interoperability, accessibility, integrity, and high initial investments. This integral solution goes one step beyond the current management techniques.
Smart campus is a general concept, without a single process to reach it. The methodology adopted by this project entailed the BIM implementation. This showed several pros and cons that are discussed in this section.
The paper gathers the first steps of applying several emerging technologies in order to achieve the smart campus category. These steps are the final phase of a process that transforms a traditional campus into an intelligent one. The process has three stages: traditional campus, e-campus, and digital campus as the final phase [86].
Considering BIM as a virtual representation of all the elements of the infrastructure throughout their lifecycle or BIM as a central point of information storage [3,[5][6][7] and through synchronization with other technologies, it could reach an advanced smart campus concept.
IoT or sensor implementation without BIM may provide real-time information in different databases formats. However, IoT and sensors, together with BIM-FM, can be synchronized and provide real-time information not only in database formats but can also reflect all the information to each infrastructure element providing the user with a total visualization. Real-time occupation in this project is registered by sensors and the data is sent to a SQL database. With the BIM-FM methodology, the institution offers the users a range of colors applied to a floor plan to easily locate this real-time occupation.
Managing the university assets by RFID is one of the most common practices in the university environment. However, the proposal of this study was to manage the university assets through the BIM model, showing remarkable benefits. In this case, all assets are located and boast detailed geometry and special characteristics. Moreover, the visualization of the environment, allowed by the model, simplifies the use of the tool. This permits interaction with all the infrastructure elements and characteristics or the parameters could be consulted.
Additionally, BIM-FM implementation is a complex process that demands the virtual construction of a BIM model. Moreover, BIM information formats attach multiple problems in terms of interoperability and the sector demands international standards, such as the Construction Operations Building Information Exchange (COBIE) standard [3]. Other challenges and drawbacks of the BIM-FM implementation are the legal issues related to responsibilities or confidential information in the total collaborative environment established in BIM [102,103].

Conclusions
This project developed a new BIM-based FM system for ETSICCP. As a result of the research, a complete BIM model was performed, hosting all the parameters associated with day-to-day management tasks. The BIM-FM system enables the management of classrooms, sport facilities, locker assignment, or any location information. This management encompasses the possibility of making reservations, placing academic scheduling, reading temperature and humidity, reveal sitting capacity, or showing equipment maintenance. For that purpose, new software was developed, allowing the interaction of the BIM model, through use of sensors and SQL databases. Both the model and its management software are hosted in a public server with total accessibility through an internet web page. The BIM-FM system supports the possibility to update real-time information from sensors that can monitor temperature, humidity, occupation, and any other information that sensors may provide in the future.
The development of this project under the BIM-EDU concept opens up the research path on BIM-based educational management holding concepts related to either pure infrastructure management or to educational terms. Moreover, implementing a new detailed BIM management system involves many challenges in order to achieve the completion with total success. Both the Social implementation process which deals with barriers, such as lack of software skills, and the resistance of changing work traditional methodologies stand out. In this sense, the main purpose of this research was to make the BIM management benefits accessible for all entities involved within the infrastructure management, even without any BIM skills.
As a result of the project, BIM model has been developed considering open mind properties in terms of adding new outstanding technologies, such as Big Data and IoT. Synchronizing real time data with a 3-D model of the infrastructure, as well as the possibility of saving historical information into a Big database, are the main targets of the project. A huge amount of data to be managed could be expected not only given the large size of the infrastructure but also given those real-time information demands. In that regard, spreadsheets as a database management were not considered efficient enough. Therefore, Big Data technologies, like SQL databases, were used because they allow this possibility.
However, not only social barriers have been found, but programming aspects related to file formats have also been detected. Furthermore, BIM modeling software boasts many peculiarities in terms of object properties that could directly affect the extracted data.
Overcoming those social and computer science challenges could be possible, thanks to BIM modeling, making the management of educational infrastructure much more efficient. Those detailed facts are quite common in the literature review for this project. A specific review for BIM environment is attached to the paper. Starting with standard definitions and applications of BIM provided by published research and expanding into the pure management BIM concept and new technologies synchronized with BIM, such as IoT and GIS.
Overall, literature review and research experience have many common points related to barriers for BIM implementation. Once those barriers were overcome, BIM management system provides a highly efficient operation and a more productive information flow for all the members associated with the infrastructure handling, especially in complex buildings, like university venues. Moreover, future developments, such as management protocols against COVID-19, could be implemented. Thanks to the new management tools, management staff could handle all spaces and internal movements, thanks to BIM model and BIG DATA databases.
In this study, BIM-FM was applied in new and broader ways for educational management, showing multiple benefits for future applications. Collecting and registering information in digital format is one of the most important gains attained, making the information for users or management staff more accessible. Another outstanding advantage is providing the ETSICCP with the BIM model. As a living organism where live scheduling information is given graphically, the model provides a great number of possibilities. This allows the management staff to manage the availability of a wide amount of spaces along the building or the cleaning protocols in a more efficient way. The large amount of detail in the model of the elements and parameters, i.e., connection box, capacity, air conditioning, or projector characteristics, which are detailed for each space and official documents attached to the website allow the lecturers to select the optimal space considering significantly more variables than with the traditional methods. Moreover, with the current COVID situation, digital and real time information can be of greater significance than in previous circumstances. BIM model, as the key point of the management methodology, provides detailed geometric information and allows the user to show real time data in a graphical way. Reducing the use of paper format, tracking down energetic consumption, and online FM were the outstanding points detailed for the management staff. It is important to highlight that a BIM methodology implementation demands training in BIM and software skills for the staff and the rest of the users. However, in this study, a total accessible internet webpage hosts all BIM information. Thus, no training is required. This turns the proposed methodology into the first BIM methodology with total accessibility and with the minimum social barriers related to its implementation. Funding: The APC was funded by the UPM through the Educational Innovation Project IE1920.0409.