Abstract:The seismic response of cable-stayed bridges in high intensity area is large, so it is very important to select a reasonable longitudinal and transverse constraint system. Based on an example of a concrete double-pylon cable-stayed bridge, the finite element models of cable pylon and main girder are respectively established for longitudinal and transverse consolidation, free and damped restraint systems. The conclusion is obtained that the longitudinal setting up of viscous damper and the transverse setting up of steel damper are the relatively optimal restraint systems. And by comparing the parameters, the setting of reasonable damper parameters makes the internal force and displacement of the key section of the bridge able to control better. In addition, because of the large difference of the natural vibration periods between the long-span cable-stayed bridge and the adjacent approach bridge, the collision or beam falling are easy under the strong earthquake. The collision contact element is arranged at the end of the model beam. The effects of collision stiffness and initial clearance on cross-section force and collision force are discussed. The result shows that the setting up of the elastic inhibiting device with the proper parameters can weaken the seismic response at the transitional pier.
