千米级斜拉桥的横向减震体系研究

Research on the lateral earthquake-reduction system of kilometer-scale cable-stayed bridge

为了确定千米级斜拉桥合理的横向减震体系,首先建立了千米级斜拉桥有限元模型,对其进行了横桥向的地震易损性分析,得到了横向地震易损性部位;然后在边墩、梁之间分别采用:滑动摩擦型支座,滑动摩擦型支座+液体粘滞阻尼器,FPI(Friction Pendulum Isolation)支座+液体粘滞阻尼器的三种方式建立了三种横向减震体系;其次分别对上述三种横向减震体系,进行了非线性动力时程分析,并且研究了横向减震参数的设置;最后进行了数据的分析,提出横向减震体系的设计要求,液体粘滞阻尼器设置的正确位置,并建议选用千米级斜拉桥的最合理的横向防震体系和分析方法。

In order to establish the lateral earthquake-reduction system of the long span cable stayed bridges (CSBs) over one kilometer, firstly a finite element model of CSBs longer than 1 km is set, on which the lateral seismic vulnerability analysis are performed, and the lateral seismic vulnerability parts of the bridge are obtained. Secondly,the sliding bearing,the sliding bearing + liquid viscous damper, and the friction pendulum isolation +liquid viscous damper,have been applied,between the side pier and beam to achiere, three lateral earthquake-reduction systems.Then several nonlinear time history analyses on the above three lateral earthquakereduction systems are conducted and the parameters of lateral earthquake-reduction have been determined.Last,the compute results of the model are discussed and compared and the rational lateral earthquake-reduction system and the analysing methods of CSBs longer than 1km are recommended.