多向地震耦合作用下MRD结构的地震反应分析

地面的竖向运动和水平运动具有相关性,因此竖向地震作用会影响磁流变阻尼器(MRD)减震效果.对多向地震耦合作用下MRD结构的理论进行研究,建立了MRD结构在水平与竖向耦合地震作用下的运动微分方程.分析了竖向地震作用对结构的影响.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,结构的地震反应有不同程度的增加.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MRD结构考虑竖向地震作用对结构的影响.

Seismic Responses of MRD Configuration Under Coupled Action of Multi-Directional Earthquake

The horizontal ground movement correlates to its vertical movement and, therefore, the vertical earthquake action will exert an influence on the damping effect the magnetorhrological damper(MRD) is available to obtain. The structure of MRD under the action of earthquake in both horizontal and vertical direction is studied theoretically with a kinematic differential equation given to analyze how the vertical action affects the structure of MRD. The results show that MRD has a good controllable effect whether the vertical action of earthquake is considered or not. However, the seismic responses from MRD structure increase differently with the vertical of earthquake, i.e., the greater the vertical action, the higher the increment. It is thus highly recommended that the influence of vertical earthquake action on various MRD structures shall be taken into account in highintensity earthquake regions.