填充墙对底框结构地震反应的影响

为研究填充墙对底层框架多层砌体房屋地震反应的影响,以典型的填充墙-底层框架多层砌体房屋为基础,建立有限元计算模型并进行了弹塑性动力时程分析。根据不同模型的计算结果以及填充墙的刚度和强度,分析了填充墙对底层框架多层砌体房屋自振周期、地震作用下房屋整体变形、底层框架的损伤以及填充墙与底层框架相互作用的影响。计算结果表明：填充墙对房屋整体地震反应产生明显影响,其影响不能忽略。在上部砌体结构质量和刚度不变的情况下,结构自振周期随着填充墙刚度的增加而降低;随着填充墙与底层框架之间连接作用的增强,结构整体的变形减小,底层框架的损伤增大。当填充墙与底层框架之间采用弱连接时,采用强度较高的填充墙可以提高结构整体的变形能力,从而提高结构整体的抗震能力。

Nonlinear Seismic Response Analysis of Multistory Masonry Building Supported by RC Frames Considering the Effects of Infill Walls

In order to study the seismic response of multistory masonry building supported by RC frames considering the effects of infill walls,a numerical model of a typical multistory masonry building supported by RC frames including infill walls was established with the finite element method and the elastic-plastic seismic response analysis for this model was performed.Based on the numerical results of different mo-dels,the stiffness and strength of the infill walls,the seismic behavior of the building considering the effects of infill walls,such as the natural cycle frequency of the building,the deformation,the damage of the first frame and the interactions between the infill walls and the first frame were analyzed.The numerical results show that the infill walls produce obvious influences on the seismic response of the building which can′t be ignored.In the condition of the same super structure and seismic load,the cycle frequency of the building decreases with the infill walls′ stiffness increasing,the deformation decreases and the damage of the first frame increases with the connection between infill walls and the first frame increasing.When the connection between infill walls and the first frame was weak,the deformation and the aseismic capability of the frame increase by using the high strength infill walls.