RC框架结构楼梯震害的试验研究及有限元分析  

Experimental research and finite element analysis on seismic damage for staircases of RC frame structures

作　　者：肖疆[1] 尹保江[1] 程绍革[1] 赵向丽[1] 

机构地区：[1]中国建筑科学研究院工程抗震研究所,北京100013

出　　处：《建筑结构》2014年第5期12-16,共5页Building Structure

基　　金：住房和城乡建设部支持项目(2009-k2-17);中国建筑科学研究院基金项目(20080122330730006)

摘　　要：汶川地震中楼梯间破坏严重,使得楼梯震害成为抗震设计中的一个热门研究课题。按照传统方法设计、制作了1/3缩尺的单层框架结构楼梯间模型,并对其进行了低周反复荷载试验。描述了楼梯间结构的破坏形态,再现了楼梯间的震害规律,分析了承载力骨架曲线、刚度退化、结构延性与耗能性能。试验结果表明,楼梯在整个弹塑性变形中提供了明显的支承力,其抗侧刚度不可忽略,且在楼梯间开裂后其耗能性能变化不大。最后还采用MSC.MARC有限元软件对试验模型进行了数值模拟分析,从裂缝开展、塑性铰形成机制及承载力骨架曲线几个方面与试验结果进行了对比,对比结果表明,有限元模拟结果与试验结果吻合较好。Staircases, which suffered serious damage in the Wenchuan Earthquake, have become a hot topic for seismic design. A I/3 scale staircase model, which was designed and constructed by traditional method, was set in a onestory RC frame structure to carry out the lowcyclic reversed loading test. The failure mode of staircases was represented and the damage law of staircases was reappeared. Skeleton curve of hearing capacity, stiffness degradation, ductility and dissipation capacity of the model were analyzed. Results indicate that the staircases provide certain supporting force during the elasto plastic deformation and its lateral stiffness should not be disregarded. The dissipation capacity of the model changes little after staircases crack. In the end, finite element software MSC. MARC was used to simulate the experimental model. The simulation results such as crack development, plastic hinge mechanism and skeleton curve of the finite element model agree very well with the experimental data.

关 键 词：框架结构 楼梯 低周反复荷载试验 楼梯震害 有限元分析 

分 类 号：TU375.4[建筑科学—结构工程]