减隔震装置在飘浮体系斜拉桥纵桥向的应用

Application Analysis of Seismic Isolation Devices on Longitudinal Seismic Response of Floating System Cable stayed Bridge

摘要:

以某双塔飘浮体系斜拉桥为工程背景，对比分析了拉索限位器和黏滞阻尼器两种减隔震装置在飘浮体系斜拉桥纵桥向的减震特点，并进一步探讨了拉索限位器和黏滞阻尼器联合使用方式对飘浮体系斜拉桥纵桥向地震响应的影响.结果表明：拉索限位器同黏滞阻尼器相比，可以更有效地控制结构位移，而黏滞阻尼器在内力控制上具有一定的优越性；联合使用方式有助于发挥各自的优势，达到拉索限位器控制梁端位移、黏滞阻尼器改善塔底受力的理想状况，是一种更为经济有效的减震措施，且在脉冲型地震动作用下同样具有良好的减震效果.

Abstract:

On the background of a double pylon cable stayed bridge of floating system, the aseismic characteristics of cable displacement restrainers and viscous dampers was compared. The effect of hybrid application of cable displacement restrainers and viscous dampers on the longitudinal seismic response of floating system cable stayed bridge was discussed. The results show that the cable displacement restrainer is able to control the displacement response effectively compared with the viscous damper, but the viscous damper has certain advantages in the internal force control. The hybrid application can achieve the goal that cable displacement restrainers control the displacement at beam ends and viscous dampers improve the force situation at the tower bottom, which is a more cost effective seismic measure and has an excellent earthquake mitigation effect under pulse ground motions.