Evaluation of Optimal Intensity Measures in Fragility Analysis of Cablestayed Bridges

Abstract:

In this study, the finite element model of Polonggou cablestayed bridge is established using OpenSEES software considering multiple nonlinear effects. 80 pairs of ground motions are chosen from Pacific Earthguake Engineering Research Center(PEER), with the input of longitudinal and transvers direction. The five index: efficiency, practicality, proficiency, sufficiency and hazard computability, are adopted to discuss and compare the advantage and disadvantage of the five IMs, peak ground acceleration(PGA), peak ground velocity(PGV), SaT1、Sa02、Sa10(acceleration response spectrum at the period of the first mode, 0.2 s and 1.0 s). The results shows that PGA is the best in terms of the index of sufficiency and practicality, and relatively good in terms of the index of efficiency and proficiency. So the PGA is the selected as the best intensity measure(IM) for cablestayed bridges.