箍筋间距和轴压比对爆炸载荷作用下钢筋混凝土柱动态响应的影响

Effects of Transverse Reinforcement Ratio and Axial Load on the Blast Response of Steel Reinforced Concrete Columns

以钢筋混凝土柱毁伤特性和抗爆机理为背景,通过实验研究钢筋混凝土柱在近距离爆炸载荷作用下的动态响应,得到不同比例距离下钢筋混凝土柱的破坏特征。为准确快速地评估钢筋混凝土柱的爆炸响应,利用有限元显示动力分析软件LS-DYNA,建立钢筋混凝土柱的三维有限元模型,同时考虑震塌效应与材料应变率效应。数值模拟结果与实验结果对比发现,该数值模拟模型可以准确模拟钢筋混凝土柱在爆炸载荷作用下动态响应。采用参数化分析方法,进一步研究箍筋配筋率和轴向载荷对钢筋混凝土柱在近距离以及远距离爆炸载荷作用下动态响应和破坏模式的影响。参数分析结果表明:箍筋配筋率对钢筋混凝土柱弯曲响应影响不大,但是可以通过提高剪切承载力提高其抗爆性能;当轴压比为0.1时,钢筋混凝土柱的抗爆能力最高。

A series of blast tests were carried out to investigate the blast response of steel reinforced concrete(RC)columns subjected to close-in blast loading.The numerical model of RC columns is developed using software LS-DYNA,in which spalling effects are considered.The accuracy of the model to simulate the response of RC columns subjected to close-in blast loads is verified by comparing the numerically simulated results with the test results.Parametric studies are further performed to examine the effects of column transverse reinforcement ratios and axial load on the dynamic response of RC columns subjected to explosions.