摘要
为了明确黏滞阻尼器参数设置对斜拉桥抗震的影响,以某座大跨双塔单侧混合梁斜拉桥为例,基于midas/Civil程序建立了桥梁的空间有限元模型,采用非线性时程方法分析了纵向黏滞阻尼器不同参数组合下地震动响应,着重探讨了阻尼器参数对称设置与不对称设置梁端位移与塔底响应减震效果.结果表明:在大跨斜拉桥塔梁连接处设置纵向黏滞阻尼器可以有效的降低桥塔、主梁关键位置的位移,从而降低主梁与引桥发生碰撞的概率;合理优化后的阻尼器参数组合可兼顾对位移及内力的减震,使其同时达到对结构最有利的减震效果;非对称设置时,在混合梁一侧的阻尼系数取较大值,钢主梁一侧阻尼系数取较小值时,塔底内力减震效果最优;阻尼器参数对称设置和非对称设置时最优参数组合都可以有效提高位移和弯矩的减震率,且两种参数组合下各响应的减震率相差不大.
In order to clarify the influence of viscous damper parameter setting on the earthquake resistance of cable-stayed bridge,taking a long-span cable-stayed bridge with double towers and one-sided hybrid beam as an example,the spatial finite element model of the bridge was established based on Midas/civil program,and the seismic response of longitudinal viscous damper with different parameter combinations was analyzed by nonlinear time-history method.The damping effect of beam end displacement and tower bottom response with symmetrical and asymmetrical dampers was emphatically discussed.The results show that setting longitudinal viscous damper at the connection of tower and girder of long-span cable-stayed bridge can effectively reduce the displacement of key positions of tower and girder,thus reducing the probability of collision between girder and approach bridge.The optimized combination of damper parameters can give consideration to the damping of displacement and internal force,so that it can achieve the most beneficial damping effect for the structure at the same time.Under asymmetric setting,when the damping coefficient on the side of the hybrid beam is larger and the damping coefficient on the side of the steel main beam is smaller,the damping effect of the internal force at the bottom of the tower is the best.The optimal parameter combination with symmetric and asymmetric damper settings can effectively improve the damping ratio of displacement and bending moment,and the damping ratio of each response has little difference under the two parameter combinations.
作者
邓育林
易磊
DENG Yulin;YI Lei(School of Transportation and Logistics Engineering School of Transportation, Wuhan University of Technology, Wuhan 430063, China)
出处
《武汉理工大学学报（交通科学与工程版）》
2022年第3期483-488,494,共7页
Journal of Wuhan University of Technology（Transportation Science & Engineering）
基金
国家自然科学基金(51678459)。
关键词
大跨斜拉桥
混合梁
非线性时程法
黏滞阻尼器
纵向减震体系
long-span cable-stayed bridge
nonlinear time history method
composite beam
viscous dampers
longitudinal damping system
作者简介
第一作者:邓育林(1977—),男,博士,副教授,主要研究领域为桥梁抗震。
