The Effect of Seismic Isolation on the Dynamic Behavior of Cable-Stayed Bridges

Abstract

The earthquake effects on cable-stayed bridges isolated by single concave friction pendulum (SCFP) are investigated in this study. Reducing ways of the destructive earthquake effects are getting vital important for researchers and engineers. One of the most accepted ways for reducing the effects of earthquake is using seismic isolation systems. The result obtained from an analytical study on the seismic responses of Manavgat Cable-Stayed Bridge with and without seismic isolation system are compared each other. The selected bridge is the first cable-stayed bridge of Turkey and has 202m length between its side supports. In order to determine the contributions of isolation systems to the bridge dynamic behavior, 3D finite element model (FEM) of the bridge is created in Sap2000 [1]. Time history analysis is performed for 3D FEM. Three different earthquake ground motions having transverse and longitudinal directions are used in analyses. Comparison of dynamic behavior of the bridge with and without the SCFP systems under three different earthquake motions has been conducted. The results obtained from analyses of the bridge are presented by graphics and tables in detail. It is seen that using of isolation system reduces the destructive effects of earthquakes on the bridge.