Performance of the Transverse Connectivity in Simply Supported Girder Bridges and Its Strengthening Strategy
Publication: Journal of Performance of Constructed Facilities
Volume 31, Issue 5
Abstract
A critical problem in evaluating the structural behavior of simply supported girder bridges is the performance of the transverse connectivity of girders. Traditional structural calibration factors, which are based on loading test results, are only capable of evaluating the load-bearing capacity of girders. To resolve the difficulty in evaluating the transverse connectivity performance of existing simply supported girder bridges, two parameters and were proposed based on the loading tests results of 65 simply supported concrete girder bridges. Moreover, threshold values for these two parameters were specified according to statistical analysis of loading tests results: when or , the bridges perform well as a complete structure in the transverse direction, and only minor repairs are needed; when or , the bridges perform poorly in the transverse direction and necessary repairing measures should be taken. Based on the data of the two evaluation parameters of surveyed bridges, a detailed strengthening strategy was established and successfully implemented in 13 field projects. According to the strengthening strategy, the following steps are to be conducted: (1) remove the damage zones in bridges, (2) rebar embedding in hinge joints, (3) install reinforcing steel grids, and (4) concrete repair. Comparative tests were made on bridges before and after the strengthening process. The results confirmed the feasibility and efficiency of the proposed strategy.
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Acknowledgments
Financial support from the National Natural Science Foundation (Nos. 51578496 and 51608481) and the Zhejiang Provincial Natural Science Foundation (Nos. LZ16E080001 and LQ15E080010) of the People’s Republic of China is gratefully acknowledged.
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Published In
Journal of Performance of Constructed Facilities
Volume 31 • Issue 5 • October 2017
Copyright
©2017 American Society of Civil Engineers.
History
Received: Dec 11, 2016
Accepted: Mar 8, 2017
Published online: Jun 14, 2017
Published in print: Oct 1, 2017
Discussion open until: Nov 14, 2017
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