[1] Lu Guanya, Wang Kehai, Zhang Panpan, et al. Performance-based system seismic assessment for long-spansuspension bridges under two-level seismic hazard [J]. Journal of Southeast University (English Edition), 2019, 35 (4): 464-475. [doi:10.3969/j.issn.1003-7985.2019.04.009]

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Performance-based system seismic assessment for long-spansuspension bridges under two-level seismic hazard()

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Journal of Southeast University (English Edition)[ISSN:1003-7985/CN:32-1325/N]

Volumn:

35

Issue:

2019 4

Page:

464-475

Research Field:

Traffic and Transportation Engineering

Publishing date:

2019-12-30

Info

Title:

Performance-based system seismic assessment for long-spansuspension bridges under two-level seismic hazard

Author(s):

Lu Guanya¹;  Wang Kehai¹;  2;  Zhang Panpan²

¹School of Transportation, Southeast University, Nanjing 210096, China
²Research Institute of Highway, Ministry of Transport, Beijing 100088, China

Keywords:

suspension bridge;  fragility curve;  seismic hazard analysis;  repair cost ratio;  system seismic performance

PACS:

U448

DOI:

10.3969/j.issn.1003-7985.2019.04.009

Abstract:

Since there are few studies on the performance-based seismic evaluation of the long-span suspension bridge system under two-level earthquake hazard in Chinese code, the developed procedure of this study can be regarded as a general program to assess the seismic performance of the overall system for long-span suspension bridges. In the procedure, the probabilistic seismic demand models of multiple bridge components were developed by nonlinear time-history analyses incorporating the related uncertainties, and the component-level fragility curves were calculated by the reasonable definition of limit states of the corresponding components in combination with seismic hazard analysis. The bridge repair cost ratios used to evaluate the system seismic performance were derived through the performance-based methodology and the damage probability of critical components. Furthermore, the repair cost ratios of the overall bridge system that was retrofitted with fluid viscous dampers for the main bridge and changed restraint systems for the approach bridges were compared. The results show that peak ground velocity and peak ground acceleration can be selected as the optimal intensity measurements of long-span suspension bridges using the TOPSIS(technique for order preference by similarity to an ideal solution). The bridge repair cost ratios can serve as accurate evaluation indicators to provide an efficient evaluation of retrofit measures. The seismic evaluation of long-span bridges is misled when ignoring the interaction of adjacent structures. However, the repair cost ratios of a bridge system that has optimum seismic performance are less sensitive to the relative importance of adjacent structures.

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Memo

Memo:

Biographies: Lu Guanya(1990—), male, Ph.D. candidate; Wang Kehai(corresponding author), male, doctor, professor, kh.wang@rioh.cn.
Foundation item: Basic Scientific Research Service Project of Central-level Public Welfare Research Institute(No.2016-9018).
Citation: Lu Guanya, Wang Kehai, Zhang Panpan.Performance-based system seismic assessment for long-span suspension bridges under two-level seismic hazard[J].Journal of Southeast University(English Edition), 2019, 35(4):464-475.DOI:10.3969/j.issn.1003-7985.2019.04.009.

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