新型客站随机地震响应的控制策略

高速铁路建造过程中出现的新型客站往往以房桥合一为特征,其综合了房屋建筑和桥梁结构二者的特点,抗震与减震设计必然不同于一般结构物。本文首先建立在新型客站中设置层间隔震和混合减震控制的基本模型,并基于随机地震输入和虚拟激励法推导高效计算表达式。在此理论基础上,研究层间隔震技术的减震效果和工作机理,指明层间隔震存在的缺陷。继而针对层间隔震的不足,在房桥合一客站中引入混合减震控制策略,其在层间隔震基础上通过设置连接阻尼器实现减小桥梁位移和避免梁体碰撞的目的,深入研究层间隔震与连接阻尼器的工作机理,提出混合减震策略的优化设计方法。研究表明:层间隔震与混合控制策略在房桥合一新型客站随机地震响应控制中是可行且有效的。

Control Strategy of Stochastic Seismic Responses of the New Type Station Structure

The new type station structure appearing during construction of high-speed railways is often characterized by station-bridge integrating and it combines the characteristics of both station and bridge,which means that it’s seismic design differs from conventional structures.In this paper,the fundamental numerical models of storey isolation and hybrid control of the integrated station-bridge structure were established,and by introducing the random input of earthquake responses and the pseudo-excitation method the efficient calculation expression was derived.On the basis of the theoretical derivation,the damping effect and working mechanism of the storey isolation technique were studied and its defects were also pointed out.In view of the deficlencies of storey isolation,the hybrid control strategy was proposed which was to install viscous dampers between adjacent bridges to achieve the aim of reducing bridge displacement and avoiding beam impact.The working mechanism of the hybrid control strategy covering storey isolation and viscous dampers connection was deeply studied,and accordingly the optimized design method was putforward.The research shows that the storey isolation and hybrid control strategy are feasible and effective in control of stochastic seismic responses of integrated station-bridge structures.