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Earthquakes and Structures Volume 8, Number 3, March 2015 , pages 573-589 DOI: https://doi.org/10.12989/eas.2015.8.3.573 |
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Scenario-based seismic performance assessment of regular and irregular highway bridges under near-fault ground motions |
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Abouzar Dolati, Touraj Taghikhany,Mohammad Khanmohammadi and Alireza Rahai
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| Abstract | ||
| In order to investigate the seismic behavior of highway bridges under near-fault earthquakes, a parametric study was conducted for different regular and irregular bridges. To this end, an existing regular viaduct Highway Bridge was used as a reference model and five irregular samples were generated by varying span length and pier height. The seismic response of the six highway bridges was evaluated by three dimensional non-linear response history analysis using an ensemble of far-fault and scenario-based nearfault records. In this regard, drift ratio, input and dissipated energy as well as damage index of bridges were compared under far- and near-fault motions. The results indicate that the drift ratio under near-fault motions, on the average, is 100% and 30% more than far-fault motions at DBE and MCE levels, respectively. The energy and damage index results demonstrate a dissipation of lower energy in piers and a significant increase of collapse risk, especially for irregular highway bridges, under near-fault ground motions. | ||
| Key Words | ||
| highway bridge; pulse-like ground motion; 3-D non-linear modeling; irregular bridge | ||
| Address | ||
| Abouzar Dolati, Touraj Taghikhany,Alireza Rahai: Department of Civil and Environmental Engineering, Amirkabir University of Technology, Tehran, Iran Mohammad Khanmohammadi: School of Civil Engineering, College of Engineering, University of Tehran, Iran | ||