摘要
为探究地震作用下斜拉桥横向合理抗震体系。以一座大跨径斜拉桥为例,提出了3种横向抗震体系布置,即横向全限位体系、横向滑动体系以及横向布置钢阻尼器的减隔震体系,建立非线性动力有限元模型,并采用非线性时程法对这3种抗震体系的横向地震响应进行了对比分析。结果表明:大跨径斜拉桥横向采用减隔震体系可以很好地控制结构的横向内力和变形,减隔震效果较好;在此基础上,继续研究了此体系钢阻尼器布置在主塔处、主塔和过渡墩处、主塔和过渡墩及辅助墩处3种布置方案下结构的横向地震响应规律,从中选择最优布置,并进一步对其布置参数进行分析。结果表明:大跨径斜拉桥横向在主塔和过渡墩处设置钢阻尼器,辅助墩处设滑动支座,且主塔和过渡墩处的钢阻尼器屈服强度之比为0.6~1.2时,结构横向抗震性能最优。该研究关于斜拉桥横向抗震设计的研究方法、体系布置方案,可为实际斜拉桥横向抗震体系的设计提供参考。
In order to explore the reasonable lateral seismic system of a cable-stayed bridge under earthquake,taking a long-span cable-stayed bridge as an example,three kinds of lateral seismic system arrangements were proposed,namely,the lateral full limit system,the lateral sliding system and the lateral seismic isolation system with steel dampers.The nonlinear dynamic finite element model was established,and the lateral seismic responses of these three seismic systems were analyzed by the nonlinear time history method.The results show that the lateral isolation system with dampers can well control the lateral internal force and deformation of the structure,and the effect of seismic reduction and isolation is rather good.On this basis,three kinds of layout schemes of steel dampers including setting at the main tower,at the main tower and transition pier,at the main tower and transition pier and auxiliary pier were selected,and the corresponding lateral seismic responses were compared.Furthermore,the parameters of the optimal layout were analyzed.The results show that the transverse seismic performance of the long-span cable-stayed bridge will be the best when steel dampers are set at the main tower and transition pier,a sliding bearing is set at the auxiliary pier,and the yield strength ratio of steel damper at the main tower and transition pier is between 0.6 and 1.2.The results and ideas of the transverse seismic design in the paper provide references to the design of transverse seismic system of cable-stayed bridges in practical projects.
作者
李立峰
尹会娜
唐嘉豪
胡睿
LI Lifeng;YIN Huina;TANG Jiahao;HU Rui(College of Civil Engineering,Hunan University,Changsha 410082,China)
出处
《振动与冲击》
EI
CSCD
北大核心
2022年第6期153-159,共7页
Journal of Vibration and Shock
基金
国家自然科学基金(51978257)。
关键词
桥梁工程
大跨径斜拉桥
抗震性能
减隔震体系
钢阻尼器
bridge engineering
long-span cable stayed bridge
seismic behavior
isolation system
steel damper
