基于LS-DYNA的钢筋混凝土梁落锤冲击响应分析

Analysis of Impact Response of Reinforced Concrete Beams Based on LS-DYNA

基于LS-DYNA显示动力分析程序,对3种不同配筋梁的冲击试验进行了数值模拟,通过参数分析探究了不同落锤高度下系统总能和各部件能量在整个冲击过程中的变化规律以及不同时间下剪应力沿梁长的分布情况。结果表明:随着落锤高度增加,落锤动能与梁体内能交换会出现滞后现象,落锤高度对梁体内各部件的耗能比例没有显著影响,冲击过程中惯性效应不明显;通过分析梁体内的剪应力分布情况,揭示了梁体在冲击过程中剪应力的传播规律和落锤高度对梁体抗剪性能的影响。

The impact tests of three different reinforced beams were simulated based on the LS-DYNA explicit dynamic analysis program,and the change law of the total energy of the system and the energy of each component during the entire impact process under different drop weight heights and the distribution of shear stress along the beam length at different times were studied through parameter analysis.The results show that with the increase of the drop weight height,the kinetic energy of the falling weight and the energy in the beam body show a hysteresis phenomenon,and the drop weight height has no significant effect on the energy consumption ratio of various components in the beam body,and the inertial effect is not obvious during the impact process.The effects of the shear stress propagation law and the drop weight height on the shear resistance of the beam during the impact process are revealed by analyzing the distribution of shear stress.