多层装配式框架基础隔震结构的地震响应分析

Seismic Response Analysis of Isolated Structure of Multistory Assembled Frame Foundation

针对当前装配式建筑节点连接强度达不到传统现浇建筑的强度、稳定性及抗震性能不佳的弊端,以及基础与上部连接结构采用的是传统的结构形式,与装配化建筑发展不相适应的问题,提出了上部结构与基础构造之间的柔性连接方式,从而改善装配式建筑的抗震性能.通过ANSYS软件,建立三层的装配式钢筋混凝土框架结构民居,采用时程分析法,对地震作用下有无隔震技术的上部结构进行地震响应分析,探究此柔性基础隔震效果,为基础隔震装置的进一步研究提供一定依据.研究发现:(1)隔震技术应用后,装配式民居的自振周期明显延长;(2)三向罕遇地震波影响下,隔震装配式民居上部结构产生的层间位移、层间位移角和顶部最大加速度等均比非隔震装配式建筑更小,且兰州波作用下,隔震房屋仍处在弹性范围内使用,未进入塑性状态.综上表明基础隔震在装配式建筑中的应用具有良好的减震效果.

In view of the disadvantages that the joint strength of the current prefabricated buildings cannot reach the strength,stability and seismic performance of the traditional cast-in-place buildings,and the problems that the traditional foundation and upper connection structure form cannot adapt to the development of the prefabricated buildings,this paper puts forward the flexible connection between the upper structure and the foundation,so as to improve the seismic performance of the prefabricated buildings.Through the software of ANSYS,a three-story prefabricated reinforced concrete frame structure of residential buildings is established.The time history analysis method is used to analyze the seismic response of the superstructure with or without isolation technology under the earthquake action,to explore the isolation effect of flexible foundation,and to provide the basis for further research on the base isolation device.The results show that:after the application of the isolation technology,the natural vibration period of the prefabricated residential buildings is obviously prolonged;under the influence of three-dimensional rare earthquake wave,the interlayer displacement,displacement angle and the maximum acceleration of the top of the superstructure of the isolated prefabricated residential buildings are smaller than that of the non-isolated prefabricated buildings,and under the action of Lanzhou wave,the isolated buildings are still in the elastic range,not in the plastic state.In conclusion,the application of base isolation in prefabricated buildings has a good shock absorption effect.