中小跨径梁桥地震易损性研究

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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.

Key words： bridge system seismic vulnerability series-parallel system Copula function bridge components

Received: 08 May 2019 Published: 28 April 2020

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	Articles by authors
	SONG Shuai1
	WANG Shuai1
	WU Gang2
	XU Baishun3

Cite this article:

SONG Shuai1,WANG Shuai1,WU Gang2, et al. Seismic vulnerability analysis of small and medium span girder bridges[J]. JOURNAL OF VIBRATION AND SHOCK, 2020, 39(9): 118-125.

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http://jvs.sjtu.edu.cn/EN/ OR http://jvs.sjtu.edu.cn/EN/Y2020/V39/I9/118

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