Seismic Fragility Analysis of Multi-span Continuous Girder-rigid Frame Bridges

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Seismic Fragility Analysis of Multi-span Continuous Girder-rigid Frame Bridges

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[1]LIANG Yan,ZHANG Zhuohang,BAN Yayun,et al.Seismic Fragility Analysis of Multi-span Continuous Girder-rigid Frame Bridges[J].Journal of Zhengzhou University (Engineering Science),2023,44(01):96-102.[doi:10.13705/j.issn.1671-6833.2022.04.003]

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Journal of Zhengzhou University (Engineering Science)[ISSN 1671-6833/CN 41-1339/T] Volume: 44卷 Number of periods: 2023 01 Page number: 96-102 Column: Public date: 2022-12-06

Title:: Seismic Fragility Analysis of Multi-span Continuous Girder-rigid Frame Bridges

Author(s):: LIANG Yan; ZHANG Zhuohang; BAN Yayun; WANG Yan; School of Civil Engineering, Zhengzhou University, Zhengzhou 450001, China

Keywords:: bridge engineering; seismic performance; fragility; pier; durability

CLC:: U442. 5

DOI:: 10.13705/j.issn.1671-6833.2022.04.003

Abstract:: In order to study the seismic fragility of multi-span continuous girder-rigid frame bridges, based on OpenSEES platform, a non-linear seismic response analysis model of the actual bridge was established. Through incremental dynamic analysis, fragility curves of bridge components such as piers, supports, and abutments were established. Time-varying seismic fragility of piers of key anti-seismic components of bridges in the whole life cycle was analyzed. The failure probability of bridge structure system was estimated by boundary method, and system fragility of bridges was studied as an example. The analysis results showed that in the same damage state, 1# and 4# piers were more likely to be damaged, followed by 5# piers, and 2# and 3# piers had the least probability, as to the pier height, material strength and restraint of pier crest all affected its fragility. The bearing at abutment was more likely to cause damage than the bearing at pier; the slope of the fragility curves of the two abutments was larger, and there was no significant difference in their probability of the same damage. The probability of slight, medium and serious damage of pier increased significantly after endurance damage in the whole life cycle, moderate damage state beyond the probability increased by 3.1%, 11.3%, 20.9%, 29.1%, 34.1%, respectively, and severe damage state increased by 3.9%, 13.5%, 25.1%, 33.4%, 35.4%, respectively. Bridge systems were more fragile than individual components, and using the fragility of a single component to evaluate the fragility of the bridge could overestimate the seismic performance of the bridge.

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Last Update: 2022-12-07