RC框架结构抗连续倒塌分析

Analysis on Prevention of Progressive Collapse of RC Frame Structure

参考美国规范,运用拆除构件法,基于SAP2000通用有限元软件,对一按照我国现行规范设计的RC框架结构进行抗连续性倒塌分析,分析了移除失效柱后,剩余框架柱柱轴力的变化趋势,对比分析了柱失效位置对结构抗连续性倒塌性能的影响,并研究了层高对结构抗连续性倒塌性能的影响,得出在不考虑地震荷载作用时:角柱失效对结构影响最大;柱失效后,剩余结构的内力重分配只集中在失效跨内,失效点上方柱基本失去支撑作用;层高对结构抗连续性倒塌性能影响较小,建议结构层高取值在3.6m～4.2m之间。

Reference to American norm and based on SAP2000, alternate path method is used to analyze progres- sive collapses resistance of RC flame structures research designed according to the current design code. The paper analyzes the variation trends of axial forces of the remaining frame columns after removing the failure column, and the influence of column failure position to progressive collapses of RC frame structures and the floor height. The re- sults without considering the role of seismic loads show that： the influence of failure corner column to structure is the greatest, after column failure, the inner forces of remaining structure redistribution exist in the column-removed span. The column loses the effect of support above column-removed point. The influence of floor height is small for progressive collapses resistance of RC frame structure. The floor height of structure value is suggested between 3.6m and 4.2m.