Seismic Fragility Analysis of Cable-Stayed Bridges Considering Different Sources of Uncertainties
Publication: Journal of Bridge Engineering
Volume 19, Issue 4
Abstract
Seismic fragility analysis is a complex process involving different sources of uncertainties. In this paper, an alternative procedure for seismic fragility analysis based on the uniform design method (UD) is proposed. UD is used to generate a reasonable sample to build probabilistic seismic demand models (PSDMs), which are used to generate the fragility curves of a cable-stayed bridge. Sensitivity analyses of different uncertainties are carried out by comparison of the fragility curves for different components. It is concluded that (1) the UD method can consider different sources of uncertainties in fragility analysis with reasonable accuracy; (2) the bridge system is more fragile than any component of bridges; and (3) the damage probability of fragility considering uncertainty in the ground motion, geometry, and material is larger than that considering only the uncertainty in the ground motion.
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Acknowledgments
This research is supported by the Ministry of Science and Technology of China under Grant No. SLDRCE09-B-08, Kwang-Hua Fund for College of Civil Engineering, Tongji University, and the National Natural Science Foundation of China under Grants No. 51278376 and No. 90915011. The support is gratefully acknowledged. The authors thank Dr. Wei Kai for his valuable help.
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Published In
Journal of Bridge Engineering
Volume 19 • Issue 4 • April 2014
Copyright
© 2013 American Society of Civil Engineers.
History
Received: Sep 21, 2012
Accepted: Oct 4, 2013
Published online: Oct 7, 2013
Published in print: Apr 1, 2014
Discussion open until: May 13, 2014
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