【摘要】 结构底层柱在爆炸冲击荷载作用下的破坏会导致整体结构连续性倒塌。本文以理论分析为基础,运用有限元软件LS-DYNA对爆炸冲击荷载作用下钢筋混凝土柱的动力响应进行数值模拟。通过建立三维实体钢筋混凝土柱模型,对混凝土材料采用了脆性损伤模型,分析了不同约束情况的柱在不同折合距离时的侧向位移和失效模式。结果表明,不同折合距离下的两端固接柱的压力云图和x向位移具有明显的对称性,相同折合距离下的一端固接一端简支柱的最大压力和x向最大位移均大于两端固接柱。更多还原

【Abstract】 The failure of the reinforced concrete( RC) column on the ground floor may result in progressive collapse of the whole building. In the paper,the finite element program LS-DYNA is used to simulate the dynamic response of RC column with different constraints subjected to blast pressure. A three dimensional solid model is established for the RC column and a brittle damage model is applied to simulate the concrete. The lateral displacement and failure mode of RC column with different scaled distance are investigated and discussed. The results indicate that the pressure nephogram and x direction displacement of fixed end column under different scaled distance have the obvious symmetry. Moreover,both the maximum pressure and x direction displacement of one end fixed and one end simply supported column are bigger than fixed end column with the same scaled distance.更多还原