Seismic control of benchmark cable-stayed bridges using variable friction pendulum isolator

Abstract

Earthquake response of phase-II benchmark cable-stayed bridge with variable friction pendulum Isolator (VFPI) is investigated. The performance of this isolator is compared with traditional friction pendulum system (FPS).The seismic response of the bridge is evaluated using the hysteretic model of these sliding isolators. In phase-II benchmark problem, the ground acceleration is applied in any arbitrary direction using both horizontal components of the earthquakes with a specified incidence angle. Multi-support excitations are also considered in this phase. A comparative performance study among these two selected sliding isolators for seismic response of the bridge is carried out. Varying the important parameters e-stayed bridge problem are evaluated and optimum values of the parameters are determined. Significant reduction in base shear, base moment and other responses are observed without large deck displacement by using the VFPI. Comparing the evaluation criteria of the benchmark problem, it is observed that the performance of VFPI is better than FPS.