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以广东李家沙大桥为工程背景,对斜拉桥线性和非线性地震反应方法进行了讨论,结果表明:在纵向+竖向地震动输入下,由于弹性地震反应方法无法考虑边墩滑动支座的摩擦耗能等非线性因素的影响,可能导致较大计算误差,而在横向+竖向地震动输入下,由于横向基本上不受滑动支座等非线性因素的影响,弹性反应谱法与非线性时程计算结果相差较小;在纵桥向合理设置阻尼器,能够有效减小斜拉桥纵向在地震作用下的反应。
Taking the Lijia Sha Bridge in Guangdong Province as the engineering background, the linear and nonlinear seismic responses of cable-stayed bridges are discussed. The results show that under the input of longitudinal + vertical ground motions, the elastic abutment sliding bearings The frictional energy dissipation and other non-linear factors may lead to large calculation errors. However, under the input of lateral + vertical ground motions, the elastic response spectrum method is not affected by nonlinear factors such as sliding bearings in the transverse direction The results of nonlinear time-history show a small difference. When the damper is set in the longitudinal direction, the response of the cable-stayed bridge under earthquake can be effectively reduced.