弹性限位对不同高度隔震结构动力响应影响分析

Seismic response analysis of elastic limitations on base-isolated structures with different heights

通过弹性限位器对隔震结构的隔震层进行限位,是减小隔震层变形,保障隔震结构在大震下安全的有效措施。为研究弹性限位装置对建筑高度不同的隔震结构动力响应的影响,运用OpenSees有限元软件,建立了5、10、15层3种带弹性限位的钢框架基础隔震结构模型,选取6条地震动,进行8度极罕遇地震动作用下360个工况的动力计算。通过计算结果的对比分析发现,弹性限位对中低层隔震结构应用效果较好,对高层建筑结构效果不佳;隔震层限位会导致上部结构的层间位移角和楼层加速度均增大。为取得目标限位效果,需对限位参数优化设计。

Elastic limitation device could be installed on the isolation layer to reduce the deformation of the isolation layer and ensure the safety of the isolation structure under the rare earthquake.In order to study the influence of elastic limitation device on dynamic response of isolated structures with different building heights,5-storey,10-storey and 15-storey,with elastic limitation are modeled by finite element software OpenSees.The dynamic responses of three structures of 360 limitation tests are compared and analyzed under extremely rare earthquakes of 8-degree seismic fortification zone.The results show that the elastic limit has a remarkable effect on the middle and low rise structure,but a poor effect on the high-rise structure.The elastic limitation will lead to the increase of the inter-storey drift angle and floor acceleration of the superstructure.In order to achieve the target limit effect,it is necessary to optimize the limitparameters.