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Sensors 2013, 13(12), 17346-17361; doi:10.3390/s131217346
Article

A Practical Monitoring System for the Structural Safety of Mega-Trusses Using Wireless Vibrating Wire Strain Gauges

1,2
,
1,2
,
2
 and
2,*
1 Department of Architectural Engineering, Yonsei University, 134 Shinchon-dong, Seoul 110-732, Korea 2 Center for Structural Health Care Technology in Buildings, Yonsei University, 134 Shinchon-dong, Seoul 110-732, Korea
* Author to whom correspondence should be addressed.
Received: 4 October 2013 / Revised: 9 December 2013 / Accepted: 10 December 2013 / Published: 16 December 2013
(This article belongs to the Section Sensor Networks)
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Abstract

Sensor technologies have been actively employed in structural health monitoring (SHM) to evaluate structural safety. To provide stable and real-time monitoring, a practical wireless sensor network system (WSNS) based on vibrating wire strain gauges (VWSGs) is proposed and applied to a building under construction. In this WSNS, the data measured from each VWSG are transmitted to the sensor node via a signal line and then transmitted to the master node through a short-range wireless communication module (operating on the Industrial, Scientific, and Medical (ISM) band). The master node also employs a long-range wireless communication module (Code Division Multiple Access—CDMA) to transmit the received data from the sensor node to a server located in a remote area, which enables a manager to examine the measured data in real time without any time or location restrictions. In this study, a total of 48 VWSGs, 14 sensor nodes, and seven master nodes were implemented to measure long-term strain variations of mega-trusses in an irregular large-scale building under construction. Based on strain data collected over a 16-month period, a quantitative evaluation of the construction process was performed to determine the aspects that exhibit the greatest influence on member behavior and to conduct a comparison with numerical simulation results. The effect of temperature stress on the structural elements was also analyzed. From these observations, the feasibility of a long-term WSNS based on VWSGs to evaluate the structural safety of an irregular building under construction was confirmed.
Keywords: vibrating wire strain gauge; structural health monitoring; wireless network; mega-truss; temperature stress; long-term monitoring; irregular building vibrating wire strain gauge; structural health monitoring; wireless network; mega-truss; temperature stress; long-term monitoring; irregular building
This is an open access article distributed under the Creative Commons Attribution License (CC BY 3.0).
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Park, H.S.; Lee, H.Y.; Choi, S.W.; Kim, Y. A Practical Monitoring System for the Structural Safety of Mega-Trusses Using Wireless Vibrating Wire Strain Gauges. Sensors 2013, 13, 17346-17361.

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