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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。
It is an important part of predicting the failure mechanism of structures under accidental loads and providing new load paths for anti-collapse design of special-shaped column frame structures. 1/3 ratio of the two sides 3 × 2 cross the bottom side columns, corner column sudden failure test and quasi-static collapse test. The test phenomenon, crack distribution, failure process and load-displacement of reinforced concrete special-shaped column space frame are analyzed to analyze the force process of special-shaped column space frame and to study the transformation process of mechanical mechanism of special-shaped column space frame structure. The results show that the effect of dynamic effect on the special-shaped column space frame is not significant. There was no phenomenon of steel bar being pulled out during the test, and the cracks mainly concentrated on the support of vertical members. The collapsing process of the side columns and corner columns of the special-shaped column space frame all experienced the elastic phase, the elastic-plastic phase, the plastic phase and the catenary phase , While the catenary effect exhibited by the side columns is much larger than that of the corner columns; the catenary effect produced by the steel bars of the slab and the beam plays an important role in the anti-collapse of the special-shaped column space frame.