钢筋混凝土框架梁柱子结构抗连续倒塌动力分析

Dynamic Analysis of Reinforced Concrete Frame Beam-column Structure against Progressive Collapse

为了研究钢筋混凝土(RC)框架梁柱子结构的动力抗连续倒塌性能。通过有限元软件建立的精细化模型对两榀中柱移除的RC框架梁柱子结构静力试验进行了数值模拟。从数值模拟获取的荷载-位移曲线及破坏模态与静力试验结果对比基本吻合,能够较好地预测RC框架梁柱子结构在中柱失效后破坏的全过程。通过采用瞬间去柱的加载方式,在验证完成的RC框架梁柱子结构精细化模型基础上进行动力响应分析,并基于能量法进一步研究了结构的动力性能。研究表明:在荷载达到第一峰值荷载之前,在相同位移下采用有限元分析得出的动力抗力要高于能量法分析所得结果,但更接近实际情况。

To study the dynamic progressive collapse resistance of reinforced concrete(RC)frame beam column structure,the static test of two RC frame beam column structures with middle column removed was numerically simulated by the refined model established by the finite element software.The load displacement curve and failure mode obtained from the numerical simulation were basically consistent with the static test results.It can better predict the whole process of failure of RC frame beam column structure after the failure of the central column.By using the instantaneous column removal loading method,the dynamic response analysis was carried out on the basis of verifying the completed refined model of RC frame beam column structure,and the dynamic performance of the structure was further studied based on the energy method.Under the same displacement,the dynamic resistance obtained by finite element analysis is higher than that by energy method,but closer to the actual situation.