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工程力学  2015 

撞击荷载下钢筋混凝土柱动力响应的数值研究

Keywords: 撞击荷载,钢筋混凝土柱,动力响应,数值分析,失效模式

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Abstract:

为了研究撞击荷载下钢筋混凝土柱的动力响应,该文基于有限元软件LS-DYNA建立了钢筋混凝土构件碰撞模拟分析的数值模型。对经典钢筋混凝土梁落锤试验进行数值模拟,分析表明该数值模型能够较好的模拟钢筋混凝土构件碰撞过程中的撞击力和变形发展。基于该模型该文研究了不同因素对刚体碰撞钢筋混凝土柱动力变形和撞击力的影响,包括撞击体速度、质量和形状,钢筋混凝土柱纵向配筋率、配箍率和混凝土轴心抗压强度以及材料应变率。分析表明钢筋混凝土柱在撞击作用下的破坏模式主要包括:局部损伤型、整体破坏型和局部破坏型。影响撞击力曲线变化的因素可分为三种:撞击体自身的因素,影响柱体刚度的因素和影响柱体材料强度的因素。各种因素对撞击力峰值、撞击力平台值和撞击持时分别具有不同的影响规律。这些规律将为建立建筑结构倒塌分析的简化撞击力模型提供参考。

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