地震作用下底框架结构层间位移变形分析

Deformation Analysis on Story Displacement of Bottom Frame Structure under Earthquake Action

针对汶川地震中底层框架结构产生的震害,通过建立一个单跨4层模型,分别对裸框架、完全填充、上部3层填充而下部无填充墙的情况,按照两种不同的水平加载方式进行试验。研究表明,填充墙的存在极大地提高了结构抗侧刚度,施加水平荷载时,各层层高处模型的变形曲线呈明显的剪切型。建议在填充框架结构的设计中,应考虑填充墙的刚度影响,尽可能减轻结构震害。

The bottom frame structure caused serious seismic damage in Wenchuang earthquake,which shows that the earthquake resistant performance of the structure under the earthquake action is hard to be guaranteed by the current Chinese seismic design on the filled wall.Based on the seismic damage resulted from the bottom frame structure in Wenchuang earthquake,through building a single-span four story model,an experiment on bare frame,fully filled frame,and the frame with the upper three stories filled was conducted under two different lateral loading modes.The research indicated that the lateral stiffness was significantly enhanced by the presence of the filled wall,and the deformation curve of the model was apparent shear type while applying the horizontal loads on the floor of each story.It was suggested that the stiffness of the filled wall should be considered to minimize the earthquake damage in the design of the filled frame structure.