考虑竖向地震作用的振动控制及其优化研究

目前,MRD结构的分析通常只考虑水平地震动而不考虑竖向地震动的影响,地面的水平运动和竖向运动具有相关性,从而影响控制效果．因此对双向地震耦合作用下MRD结构的理论进行研究,建立动力分析模型并得出运动微分方程．以8层MRD结构为例进行地震反应分析,研究表明,考虑和不考虑竖向地震作用,MRD对结构均有良好的控制作用,但是竖向地震作用的存在,使结构各层的层间位移峰值有不同程度的增加,其增量随着竖向地震作用的增加而增加,因此建议在高烈度地区的建筑物考虑竖向地震作用对结构的影响．建立MRD结构优化设计模型,采用IHGA程序对结构进行优化设计．结果表明, MRD结构在各种工况下的各项地震反应均得到更好的控制．

SEISMIC RESPONSE CONTRAL OF STRUCTURES WHEN THE EFFECT OF VERTICAL EARTHQUAKE IS CONSIDERED AND ITS OPTIMIZATION

Only the action of horizontal earthquake was considered generally when structure with MRD was analyzed. The correlation of movements in horizontal and vertical directions was not well studied. This paper considers the structure with MRD under bidirectional coupling earthquake. The dynamic analysis model is set up, kinetic differential equations are obtained, and dynamic time history analysis is made. Taking an 8-story structure with MRD for example, the results show that the seismic responses of the structure with MRD increase in some extent under the action of earthquake in vertical direction. Therefore, it is highly recommended that the influence of vertical earthquake action on such structures should be taken into account in high-intensity earthquake regions. The optimal model for structures with MRD is set up. The various earthquake responses of structures with MRD under various loading conditions can be better controlled after the optimization with IHGA.