爆炸作用下高层钢筋混凝土框架结构的连续倒塌机理分析

摘要

为了探究爆炸作用下高层钢筋混凝土框架结构的连续倒塌机理，采用ANSYS／LS-DYNA软件，对外部爆炸荷载作用下结构的连续倒塌进行了模拟。建立了结构的多尺度模型并验证其有效性；分别分析了炸药位于角柱和边中柱正前方时框架结构的破坏及倒塌情况；对比了两种工况下建筑物的倒塌过程和倒塌程度。结果表明：多尺度建模方法可以有效模拟框架结构在爆炸作用下的动力响应过程；爆炸荷载作用下目标柱损伤严重，失去承载力，结构内力重分配使相邻结构损伤，最后发生连续倒塌；炸药位于不同位置时，结构的倒塌范围有显著的不同。%In order to investigate the progressive collapse mechanism of the high-rise reinforced concrete frame structure under blast loading , the progressive collapse of the high-rise reinforced concrete frame structure under ex-ternal explosion load were simulated using the ANSYS /LS-DYNA software .The multi-scale model of the structure was set up and verified .The frame structure damage was respectively analyzed and collapsed when the explosives in angle column and side column .The process and degree of collapse of the building at the above cases were contras-ted.The results show:multi-scale modeling method can effectively simulate the process of frame structure response under blast loading .The target column damage is serious under blast loading , and the target column loss of bearing capacity .The adjacent structure is damaged because internal force redistribution .At last , the progressive collapse is happened .The scope of collapse is significantly different when the explosives are located in different location .