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Volume 9
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Article

Random Field-Based Time-Dependent Reliability Analyses of a PSC Box-Girder Bridge

by
Zheheng Chen
1,
Tong Guo
2,*,
Shaobo Liu
3 and
Weiwei Lin
4
1
College of Civil and Transportation Engineering, Hohai University, Nanjing 210098, China
2
Key Laboratory of Concrete and Prestressed Concrete Structures, Ministry of Education, Southeast University, Nanjing 210096, China
3
School of Architecture and Civil Engineering, Nanjing Institute of Technology, Nanjing 211167, China
4
Department of Civil Engineering, Aalto University, Rakentajanaukio 4 A, 02150 Espoo, Finland
*
Author to whom correspondence should be addressed.
Appl. Sci. 2019, 9(20), 4415; https://doi.org/10.3390/app9204415
Submission received: 18 September 2019 / Revised: 12 October 2019 / Accepted: 16 October 2019 / Published: 18 October 2019
(This article belongs to the Special Issue Short-Term Forecasting in Civil Engineering with Multidisciplinary Approaches: Combined Numerical, Experimental and Statistical Methods)
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Abstract

The parameters affecting structural reliability are usually regarded as independent random variables in the current reliability analyses of bridge structures while the randomness of these structural parameters in spatial distribution is neglected. To overcome this disadvantage, the random field model should be used to describe their probability distribution. In this paper, a structural reliability analysis method considering the effect of a random field is proposed, and its validity is verified by three numerical case studies. A prestressed concrete (PSC) box-girder bridge with a main span of 150 m is selected for demonstration, and the importance sampling (IS) method is applied to estimate its failure probability, in which the influences of shrinkage and creep, stress relaxation, and shear lag on the time-dependent performance of the structure are taken into account. In addition, the random fields of the structure are discretized by using the local average method (LAM). Finally, the effects of random field parameters, such as the number of discrete elements, correlation model, and correlation length, on the reliability of the box-girder bridge are discussed.
Keywords: long-span box-girder bridge; random field; local average method; important sampling; creep and shrinkage; time-dependent reliability long-span box-girder bridge; random field; local average method; important sampling; creep and shrinkage; time-dependent reliability

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MDPI and ACS Style

Chen, Z.; Guo, T.; Liu, S.; Lin, W. Random Field-Based Time-Dependent Reliability Analyses of a PSC Box-Girder Bridge. Appl. Sci. 2019, 9, 4415. https://doi.org/10.3390/app9204415

AMA Style

Chen Z, Guo T, Liu S, Lin W. Random Field-Based Time-Dependent Reliability Analyses of a PSC Box-Girder Bridge. Applied Sciences. 2019; 9(20):4415. https://doi.org/10.3390/app9204415

Chicago/Turabian Style

Chen, Zheheng, Tong Guo, Shaobo Liu, and Weiwei Lin. 2019. "Random Field-Based Time-Dependent Reliability Analyses of a PSC Box-Girder Bridge" Applied Sciences 9, no. 20: 4415. https://doi.org/10.3390/app9204415

APA Style

Chen, Z., Guo, T., Liu, S., & Lin, W. (2019). Random Field-Based Time-Dependent Reliability Analyses of a PSC Box-Girder Bridge. Applied Sciences, 9(20), 4415. https://doi.org/10.3390/app9204415

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