偏心支撑对钢管混凝土组合柱框架抗连续倒塌性能的影响

摘要

To research on the progressive collapses in the models of the concrete-filled steel tubular composite column frame and the composite column the eccentrically braced,PERFORM-3D software is used to establish the 10-story space model,then these models are designed by the alternate path method which is to demolish corner,side and middle part in the bottom of the structure. Then nonlinear dynamic analysis is carried out on the remaining structure.After these works,for the frame, analysis result shows that when the composite column is broken,the plastic rotation of the beam is greater than the specification value,the structure will collapse. But for the composite column-the ec-centrically braced system,the plastic rotation of the beam is less than the specification value,the structure will not collapse.So the eccentric braces can improve the ability to resist collapse of struc-ture,and at the same time it concludes that the eccentric brace of A-form for the ability of collapse re-sistance is the best.%对钢管混凝土组合柱结构框架、框架偏心支撑结构进行连续倒塌研究,采用PERFORM-3D软件建立10层空间模形,采用拆除构件法即分别拆除底层角柱、边柱及位于结构中间的柱子,对剩余结构进行非线性动力分析.分析结果表明,当组合柱失效,与之相连的梁端的塑性转角大于规范值,即结构会发生连续倒塌.增加偏心支撑,梁端的塑性转角小于规范值,不会发生倒塌,提高结构抗倒塌能力,同时判断出偏心支撑的A形支撑抗倒塌能力最强.