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以铁路客运专线大跨斜拉桥实际工程为研究背景,探讨了斜拉桥在纵、横向不同的抗震体系下结构的地震反应特点.通过大量的非线性时程反应分析,对黏滞液体阻尼器的布设位置及力学参数进行了优化分析.结果表明,沿纵桥向在塔梁间设置黏滞液体阻尼器,并合理选择阻尼器的力学参数,可显著降低主塔纵桥向的结构内力、塔顶位移以及塔梁间相对运动位移;沿纵桥向在塔梁间及辅助墩顶同时设置阻尼器则不仅可降低辅助墩及主塔的结构内力,还可有效提高塔顶位移及塔梁间相对运动位移的减震效果;沿横桥向仅在过渡墩、辅助墩顶设置阻尼器可显著降低过渡墩及辅助墩的墩身及其桩基础的横向地震反应.
Taking the actual project of long-span cable-stayed bridge on railway passenger dedicated line as the research background, the seismic response characteristics of the cable-stayed bridge under different vertical and horizontal seismic systems are discussed.By a large number of nonlinear time-history analysis, The results show that viscous liquid damper is installed along the longitudinal bridge between the tower and girder and the mechanical parameters of the damper are reasonably selected so that the structural internal force of the longitudinal bridge can be significantly reduced The displacement of the tower and the relative movement between the tower and the girder; the simultaneous arrangement of dampers along the longitudinal bridge between the tower girder and the auxiliary pier can not only reduce the structural internal forces of the auxiliary pier and the main tower, but also effectively increase the displacement of the tower and the tower The damping effect of the relative motion displacement between the beams can be obtained. The dam located only at the transitional pier and the auxiliary pier along the transverse bridge can significantly reduce the lateral seismic response of the pier body and the pile foundation of the transition pier and the auxiliary pier.