System under Seismic Loadings and Seismic Response of Curve Bridge with Frictional Pendulum System under Multidimensional Seismic Excitation

Abstract

The earthquake exhibits significant abruptness and extensive destruction, while the bridge is crucial for linking the transportation hub pre- and post-earthquake. Ensuring the bridge's seismic resilience is vital for minimizing casualties and property damage, as well as facilitating rescue operations. This study examines the impact of multidimensional seismic excitation on the seismic performance of a curved bridge utilizing a friction pendulum. A finite element model of a four-span curved simply supported beam girder is developed using Sap2000. Seismic excitation artificially manufactured with MATLAB. The analysis focuses on the influence of the seismic wave's characteristic period and the friction coefficient of the friction pendulum on the seismic response of vibration-isolated bridges, employing the nonlinear time-distance method. The findings indicate that the characteristic period of seismic waves exerts varying effects on distinct locations of the bridge structure, with vertical seismic waves significantly impacting the seismic response of the abutment structure, the maximum rate of change exceeds 40%. Furthermore, as the friction coefficient escalates, the varying dimensions of seismic waves increasingly affect different locations of the bridge structure, while the seismic response of the abutment follows a consistent pattern of change, the minimal value is achieved at a friction factor of 0.07.