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为了研究悬链线效应对钢筋混凝土(RC)框架结构抗连续倒塌能力的影响,基于OpenSees建立可以考虑悬链线效应的RC框架宏模型,通过两个RC框架子结构在移除中柱后的竖向承载力试验结果对比,验证了所采用宏模型的合理性,并研究了悬链线效应对RC框架子结构抗连续倒塌能力的影响。分别采用备用荷载路径法中的非线性静力方法和非线性动力方法对1栋10层RC框架结构进行抗连续倒塌能力分析,研究悬链线效应对RC框架整体结构抗连续倒塌能力的影响。结果表明:不考虑悬链线效应的影响将低估RC框架结构的抗连续倒塌能力;在移除底层中柱情况下,不考虑悬链线效应分析得到的荷载放大系数最大值小于2.0,而考虑悬链线效应分析得到的荷载放大系数最大值则超过2.0。
In order to study the effect of catenary effect on the continuous collapse resistance of reinforced concrete (RC) frame structure, an RC frame macro model that can consider catenary effect was established based on OpenSees. After two RC frame substructures were removed, The vertical bearing capacity test results contrast, verify the rationality of the macromodel used, and study catenary effect on RC frame substructure anti-continuous collapse ability. The anti-continuous collapse capability of a 10-story RC frame was analyzed by using the nonlinear static method and the nonlinear dynamic method in the alternate load path method. The effect of catenary effect on the continuous collapse resistance of the RC frame was studied. The results show that the effect of catenary without considering the effect of catenary will underestimate the resistance to continuous collapse of RC frame structure. When the bottom column is removed, the maximum value of load amplification factor without catenary effect analysis is less than 2.0 The maximum coefficient of load amplification obtained by catenary effect analysis is over 2.0.