Seismic vulnerability analysis of small and medium span girder bridges
SONG Shuai1,WANG Shuai1,WU Gang2,XU Baishun3
1.School of Civil Engineering, Taiyuan University of Technology, Taiyuan 030024, China;
2.School of Civil Engineering and Architecture, East China Jiaotong University, Nanchang 330013, China;
3.Transportation Institute, Inner Mongolia University, Hohhot 010021, China
Abstract:In order to accurately evaluate the seismic vulnerability of bridge systems, a new vulnerability analysis method of the bridge system based on series-parallel system and Copula function technology is proposed.The pier is a control component in the bridge and is difficult to be repaired after earthquakes.Bridge piers are combined by a series system.For bridge abutments and bearings which are less difficult to be repaired, a parallel system is used to simulate them.The three types of component classes are then connected in the series form, and a series-parallel system of the bridge system is developed.A three-span continuous box girder bridge is used to illustrate the seismic vulnerability analysis method of bridge systems based on the series-parallel system.The results are compared with the system vulnerability based on the series system.The results show that the vulnerability of the small and medium span continuous bridge system is significantly overestimated based on a simple series system.Compared with the series-parallel system, deviations of the vulnerability medians in the longitudinal direction are 22.2%, 20.7%, 20.5% and 24.6% for slight, medium, severe and complete limit states, respectively.The deviations in the transverse direction are respectively 30.0%, 16.1%, 9.8% and 11.3% for the four limit states.The seismic vulnerability of the bridge system based on the series-parallel system is more realistic and reasonable.
宋帅1,王帅1,吴刚2,徐佰顺3. 中小跨径梁桥地震易损性研究[J]. 振动与冲击, 2020, 39(9): 118-125.
SONG Shuai1,WANG Shuai1,WU Gang2,XU Baishun3. Seismic vulnerability analysis of small and medium span girder bridges. JOURNAL OF VIBRATION AND SHOCK, 2020, 39(9): 118-125.
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