摘要
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.
For the long-span cable-stayed bridges on a passenger-dedicated railway line, the structural seismic response features are discussed in the case of longitudinal and transverse aseismic systems, respectively. With a large amount of nonlinear time-history analysis conducted, optimization analysis of the layout and mechanical parameters for the viscous dampers is realized. The analysis results show that if mechanical parameters of the viscous dampers longitudinally installed between the main tower and the main girder are reasonably selected, the longitudinal structural internal force of the main tower, the longitudinal displacement of the main tower＇s top and the relative displacement between the main tower and the main girder can be significantly reduced;In addition, by longitudinally also installing viscous dampers between the auxiliary pier and the main girder, the longitudinal structural internal force of the auxiliary pier and the main tower can be reduced and, meanwhile, the damping effect for the displacement of the main tower＇s top and the relative displacement between the main tower and the main girder can be effectively improved; The transverse seismic responses for the auxiliary pier, the transition pier and their pile foundations can be remarkably reduced, with transverse viscous dampers installed between the auxiliary pier/the transition pier and the main girder.
出处
《应用基础与工程科学学报》
EI
CSCD
北大核心
2014年第1期160-169,共10页
Journal of Basic Science and Engineering
基金
国家自然科学基金项目(51368034
51068017)
长江学者和创新团队发展计划资助(IRT1139)
甘肃省高等学校基本科研业务费项目
关键词
客运专线
斜拉桥
抗震体系
黏滞液体阻尼器
非线性时程分析
passenger dedicated railway line
cable-stayed bridge
aseismic system
viscous liquid damper
nonlinear time-history analysis
