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Scenario-based seismic performance assessment of regular and irregular highway bridges under near-fault ground motions

  • Dolati, Abouzar (Department of Civil and Environmental Engineering, Amirkabir University of Technology) ;
  • Taghikhany, Touraj (Department of Civil and Environmental Engineering, Amirkabir University of Technology) ;
  • Khanmohammadi, Mohammad (School of Civil Engineering, College of Engineering, University of Tehran) ;
  • Rahai, Alireza (Department of Civil and Environmental Engineering, Amirkabir University of Technology)
  • Received : 2013.11.01
  • Accepted : 2014.06.19
  • Published : 2015.03.25

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 near-fault 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.

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