考虑填充墙作用的框架结构Pushover分析

通过对"汶川地震"中框架填充墙的破坏情况进行调查分析,给出了框架填充墙的主要破坏形式,并总结发生破坏的原因;针对砌体填充墙框架结构在地震作用下的受力特点,提出结构简化计算模型(框架-斜撑模型),利用等效轴向刚度推导出斜撑宽度;结合实际工程,采用框架-斜撑模型对已建的框架填充墙结构进行Pushover分析,对结构的抗震能力做出评估。结果表明:①填充墙消耗了大量的地震能量,对周边部分构件起到了保护作用;②填充墙的参与,改变了结构的受力状态,结构薄弱部位也发生了变化。

Pushover Analysis on Frame Structure under Effect of Filling Walls

The investigation and analysis are made for the destruction of the frame filling walls in "Wenchuan Earthquake",the main failure modes of the frame filling walls are showed,and the reasons of damage are summarized;The simplified calculation model and frame bracing model are also proposed here based on the force characteristics of the frame structure for masonry filling walls,and the width of the bracing is derived by using the equivalent axial stiffness;Combined with practical engineerings,Pushover analysis are adopted for existing frame filling wall structure by using the simplified numerical model and frame bracing model,so as to assess the seismic capacity of the structure.The results show that: ① A lot of the earthquake energy is consumed by the filled walls,so the peripheral components could be protected.② Because of the filled walls,the state of force and the weak place of the structure would be changed.