Paper Title: Influence of Ground Motion Characteristics on the Seismic Vulnerability of Bridges

Shivang Shekhar, & Vivek Singh

2022-11-14

This study focuses on understanding and quantifying the differences in vulnerability of highway bridges when subjected to near-field pulse-like ground motions and long-duration records as compared to widely available far-field ground motions that are short duration. For this purpose, a case-study highway bridge located in the Himalayan region is selected. Suites of near-field pulse-like and long-duration ground motions are selected that are spectrally equivalent to recorded far-field short-duration ground motions widely adopted for the design and assessment of bridges. A detailed FE model of the bridge is developed, and a set of nonlinear time history analyses is performed for each ground motion suite at numerous scaled intensity levels to develop seismic fragility curves. Results reveal that there is a 33% difference in the median fragility estimates of complete damage state between short- and long-duration