超大跨度斜拉桥的横向约束体系

为了确定超大跨度斜拉桥的合理横向抗震约束体系,以苏通长江公路大桥为研究对象,采用非线性时程分析方法,分析了3种边墩、梁横向约束体系即横向滑动体系、全限位体系和减隔震体系(流体黏滞阻尼器连接体系)对超大跨度斜拉桥地震反应的影响,重点研究了阻尼器的合理设置方式及阻尼器参数。结果表明:对于超大跨度斜拉桥,横向滑动体系和全限位体系均不是理想的抗震体系;而在边墩、梁之间设置横向流体黏滞阻尼器可以显著减小边墩的横向内力以及梁端的横向位移,流体黏滞阻尼器应分散设置在各边墩上。

Lateral Constraint Systems for Super-long-span Cable-stayed Bridge

In order to find out the appropriate lateral seismic constraint system for super-long-span cable-stayed bridges,the seismic responses of super-long-span cable-stayed bridges with three lateral connection systems between side piers and girder were investigated,taking the Sutong Yangtze River Highway Bridge as studying object,and using the nonlinear time-history analysis method.The influences of three constraint systems,ie lateral sliding system,fixed system,and seismic isolation system adding fluid viscous dampers on the seismic response of cable-stayed bridge were investigated with focus on the damper arrangement and damper parameters.The results indicate that,for a superlong-span cable-stayed bridge,lateral sliding system and fixed system are all not appropriate constraint system;adding lateral fluid viscous dampers can effectively reduce the lateral internal forces of side piers and lateral displacement at the end of girder,and the dampers shall be placed on each side pier.