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

作者：Dolati Abouzar; Taghikhany Touraj^*; Khanmohammadi Mohammad; Rahai Alireza

来源：Earthquakes and Structures, 2015, 8(3): 573-589.

DOI：10.12989/eas.2015.8.3.573

• highway bridge
• pulse-like ground motion
• 3-D non-linear modeling
• irregular bridge

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.

• 出版日期2015-3