双向地震耦合作用对基础摩擦隔震结构的影响

采用多质点层间剪切型模型,建立了基础摩擦隔震多层砌体结构在水平与竖向耦合地震作用下的运动微分方程及滑动与啮合状态判别准则·通过数值计算,分析了竖向地震作用对隔震结构的影响,研究表明,竖向地震作用的存在,使隔震结构下部各层,特别是首层的层间位移,层间剪力增加,隔震层加速度增加,且随地震烈度,竖向加速度峰值增大而增加,并使隔震层的滑动位移幅值有增大的可能·建议在高烈度震区考虑竖向地震作用对结构反应的影响·

Coupling Effect of Bidirectional Earthquake on Multi-storey Structures on Isolated Frictional Base

A kinematic differential equation and criterion to discriminate sliding from joggling state were developed by virtue of an interstorey shearing model with multi-degree of freedom considered for those multi-storey masonry structures which are built on an isolated frictional base and under the action of earthquake in both horizontal and vertical directions, which a numerical analysis is made to the influence of vertical action on earthquake-isolated structures. The results show that the vertical action enables the lower storeys especially the ground or 1st storey to displace. Thus, the interstorey shear and displacing acceleration will increase and go on further with the higher peak value of vertical acceleration when the earthquake intensity is increasing. It is also possible that the sliding displacement amplitude will increase then. So, it is highly recommended that the influence of vertical earthquake action on such structures shall be taken into account in high-intensity earthquake regions.