The Strength Reduction Factors for Seismic-Isolated Bridges Characterized by SDOF Bilinear Systems in Far-Fault Areas |
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| Authors: | Yi-Feng Wu Hao Wang Ai-Qun Li Ben Sha Kai-Ming Bi |
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| Affiliation: | 1. Beijing Advanced Innovation Center for Future Urban Design, Beijing University of Civil Engineering and Architecture, Beijing, China;2. Key Laboratory of Concrete and Prestressed Concrete Structures of the Ministry of Education, Southeast University. Nanjing, China;3. Key Laboratory of Concrete and Prestressed Concrete Structures of the Ministry of Education, Southeast University. Nanjing, China;4. Centre for Infrastructural Monitoring and Protection, School of Civil and Mechanical Engineering, Curtin University, Kent Street, Bentley, WA, Australia |
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| Abstract: | This article presents a statistical study on strength reduction factors for seismic-isolated bridges in far-fault areas. 1410 ground motions are selected and modified to be compatible with the recommended response spectra. Then, they are divided into 60 groups to investigate the effects of PGA/PGV ratios, soil conditions and post-to-pre-yield stiffness ratio. Results show that reduction factors are significantly affected by the PGA/PGV ratio, while the latter two items are not as important as the first one. Finally, an improved equation to estimate the reduction factor is proposed, and the accuracy of the equation is verified by additional records. |
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| Keywords: | Strength Reduction Factor Seismic-Isolated Bridge SDOF System Response Spectra Regression Analysis |
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