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Computers and Concrete Volume 23, Number 1, January 2019 , pages 1-10 DOI: https://doi.org/10.12989/cac.2019.23.1.001 |
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Seismic investigation of pushover methods for concrete piers of curved bridges in plan |
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Hamid Reza Ahmadi, Nariman Namdari, Maosen Cao and Mahmoud Bayat
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| Abstract | ||
| The use of non-linear analysis of structures in a functional way for evaluating the structural seismic behavior has attracted the attention of the engineering community in recent years. The most commonly used functional method for analysis is a non-linear static method known as the \"pushover method\". In this study, for the first time, a cyclic pushover analysis with different loading protocols was used for seismic investigation of curved bridges. The finite element model of 8-span curved bridges in plan created by the ZEUS-NL software was used for evaluating different pushover methods. In order to identify the optimal loading protocol for use in astatic non-linear cyclic analysis of curved bridges, four loading protocols (suggested by valid references) were used. Along with cyclic analysis, conventional analysis as well as adaptive pushover analysis, with proven capabilities in seismic evaluation of buildings and bridges, have been studied. The non-linear incremental dynamic analysis (IDA) method has been used to examine and compare the results of pushover analyses. To conduct IDA, the time history of 20 far-field earthquake records was used and the 50% fractile values of the demand given the ground motion intensity were computed. After analysis, the base shear vs displacement at the top of the piers were drawn. Obtained graphs represented the ability of a cyclic pushover analysis to estimate seismic capacity of the concrete piers of curved bridges. Based on results, the cyclic pushover method with ISO loading protocol provided better results for evaluating the seismic investigation of concrete piers of curved bridges in plan. | ||
| Key Words | ||
| curved bridges; pushover analysis; cyclic loading; incremental dynamic analysis | ||
| Address | ||
| Hamid Reza Ahmadi: Department of Civil Engineering, Faculty of Engineering, University of Maragheh, Maragheh, P.O. Box 55136-553, Iran Nariman Namdari: Department of Civil Engineering, Bandar Abbas Branch, Islamic Azad University, Bandar Abbas, Iran Maosen Cao: Department of Engineering Mechanics, Hohai University, 210098 Nanjing, Jiangsu, People\'s Republic of China Mahmoud Bayat: Department of Civil and Environmental Engineering, University of Pittsburgh, 3700 O\'Hara Street, 729 Benedum Hall, Pittsburgh, PA 15261, USA | ||