中文摘要：

预知结构在偶然荷载作用下的失效机理和提供新荷载路径是异形柱框架结构抗倒塌设计的重要内容。进行1/3比例的两层3×2跨的底层边柱、角柱的突然失效试验及拟静力倒塌试验。分析钢筋混凝土异形柱空间框架的试验现象、裂缝分布、破坏过程及荷载-位移等,进行异形柱空间框架受力过程分析,研究异形柱空间框架结构的受力机制转换过程。研究结果表明：动力效应对异形柱空间框架的影响效果并不显著。试验中没有出现钢筋被拔出现象,裂缝主要集中在竖向构件支座处;异形柱空间框架的边柱、角柱倒塌破坏过程均经历了弹性阶段、弹塑性阶段、塑性阶段和悬链线阶段,边柱表现的悬链线效应远大于角柱的;楼板及梁的钢筋产生的悬链线效应在异形柱空间框架抗倒塌中发挥重要作用。

英文摘要：

It is very important to understand the failure mechanism and alternative load paths for the collapse resistance design of a RC specially-shaped-column frame under accidental loading. The collapse tests were carried out for a 1/3-scale 2-story 3multiplied 2-bay reinforced concrete specially-shaped-column space-frame with a sudden side column removal or a sudden comer column removal. Then the test was carried out by a quasi-static load method. The test phenomena, crack distribution, failure process and load-displacement of a specially-shaped-column space frame was studied. The loading process of a specially-shaped-column space frame was analyzed. The transmission process of loading mechanism of the frame was analyzed. The results show that the dynamic effect is not significant to a RC specially-shaped-column frame. There is no pullout reinforcement. The cracks are mainly focus on the vertical member supports. The specially-shaped-column space frame experiences an elastic stage, an elastic-plastic stage, a plastic stage and a catenary stage during a side column test or a comer column test. The catenaries action in a side column is more obvious than that in a comer column. The reinforcement in a slab and a beam is very important to resist the collapse of a specially-shaped-column space frame.