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Advances in Concrete Construction
  Volume 7, Number 3, May 2019, pages 183-189

Probabilistic seismic demand of isolated straight concrete girder highway bridges using fragility functions
Mahmoud Bayat, Hamid Reza Ahmadi, Mehdi Kia and Maosen Cao

    In this study, it has been tried to prepare an analytical fragility curves for isolated straight continues highway bridges by considering different spectral intensity measures. A three-span concrete isolated bridge has been selected and the seismic performance of the bridge has been improved by Lead Rubber Bearing (LRB). Incremental Dynamic Analysis (IDA) is applied to the bridge in longitudinal direction. A suite of 14 earthquake ground motions from medium to sever motions are scaled and used for nonlinear time history analysis. Fragility function considers the relationship of earthquake intensity measures (IM) and probability of exceeding certain Damage State (DS). A full three dimensional finite element model of the isolated bridge has been developed and analyzed. A wide range of different intensity measures are selected and the optimal intensity measure which has the less dispersion is proposed.
Key Words
    straight highway bridge; fragility curve; Incremental Dynamic Analysis (IDA); finite element modeling
Mahmoud Bayat: Jiangxi Provincial Key Laboratory of Environmental Geotechnical Engineering and Disaster Control,
Jiangxi University of Science and Technology, Ganzhou, Jiangxi, 341000, People\'s Republic of China; Department of Civil and Environmental Engineering, University of Pittsburgh, 3700 O

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