冲击作用下型钢混凝土柱动力响应分析

Dynamic ResponseAnalysis of Steel Reinforced Concrete Columns under Impact Load

为研究型钢混凝土柱在冲击作用下的动力响应,基于有限元软件LS-DYNA建立了型钢混凝土柱的数值模型,对型钢混凝土柱的损伤演化过程进行研究,针对冲击位置的时程曲线分析其动力响应,并通过参数分析研究了柱身动力响应对不同参数的敏感性。研究结果表明,在冲击作用下型钢混凝土柱的破坏模式为局部剪切型;混凝土的塑性破坏主要发生在冲击位置斜向下45°至柱底;由于冲击体在撞击过程中发生回弹,型钢混凝土柱在整个撞击过程可分为受迫振动阶段和自由振动阶段。

To study dynamic response of steel reinforced concrete(SRC)columns under impact load,numerical models of the SRC columns were established by using finite element software LS-DYNA.Damage evolution process of SRC columns was studied.Dynamic response of the SRC columns was analyzed based on time history curves of impact position.Moreover,sensitivity between different parameters and dynamic response of the SRC columns was studied through parametric analysis.The result shows that failure mode of the SRC columns under impact load was local shear failure.Shear diagonal crack was mainly developed from impact position to the bottom of columns at 45 degree angle due to plastic failure of concrete.The whole process of impact can be divided into force vibration stage and free vibration stage,because of the impact body bounced back.