广州赤沙车辆段盖板装配式全框支剪力墙结构缩尺振动台试验研究

Shaking table test of prefabricated cover plane frame supporting shear wall structure in Chisha, Guangzhou

由于轨道交通工艺和结构布置要求,盖下结构多为框支层,其抗震性能有待考察。同时,盖下和盖上结构竖向构件不连续,需要设置转换层协调传力。选取广州赤沙车辆段某上盖装配式全框支剪力墙结构为研究对象,该整体结构高度超限,且其厚板转换层传力机制复杂。因此,设计实施了1/10大比例缩尺模型模拟地震振动台试验,开展结构抗震性能评估。试验结果表明:在7度罕遇双向地震作用下,模型整体性能良好,厚板转换层及其相连构件均未出现破坏情况;模型的Y向加速度响应和位移响应均大于X向加速度响应和位移响应,且加速度放大系数包络值在上部结构中部和顶部有明显的放大。根据试验结果推出的原型盖下框架和盖上剪力墙结构在7度多遇、罕遇地震作用下Y向和X向层间位移角均满足现行抗震规范关于层间位移角限值要求。

Due to the requirements of rail technology and structural arrangement,the lower structures are mainly supported by frame,whose seismic performances need to be investigated.Because of the discontinuity of vertical components of upper and lower structures,it is necessary to set up a transfer story.The prefabricated cover plane frame supporting shear wall structure of over-track building in Chisha,Guangzhou was selected as the research object.The structural height exceeded the limit in Chinese seismic code,and the mechanism of thick plate transfer story was complicated.Therefore,a 1/10 scaled model was designed and the shaking table test was carried out to evaluate its seismic performance.The results show that under 7-degree rare seismic ground motions,it shows good overall seismic performance.No damage forms at the thick-slab conversion layer or its connected members.The acceleration and displacement responses of the model in the Y-direction are larger than those in the X-direction,and the envolop values of acceleration amplification coefficient are significantly amplified at the middle floor and top floor of the superstructure.The Y-direction and X-direction inter-story drifts of the prototype lower frame and upper shear wall structures meet the requirements of current Chinese seismic codes under frequent earthquake ground motions and rare earthquake ground motions of 7-degree.