爆炸荷载下不同比例距离H型钢梁的动态响应

Dynamic response of H-section steel beam with different proportional distances under blast load

利用LS-DYNA软件,采用数值分析方法对爆炸荷载作用下不同比例距离的简支H型钢梁的动态响应进行了研究,结果表明,随着比例距离的减小,梁由弹性变形阶段转变为塑性变形阶段.当药量很小时,爆炸点正下方的梁顶翼缘边缘出现塑性变形且随比例距离的减小而增大.由于考虑了钢材的应变率效应,在比例距离较小(药量较大)的爆炸荷载作用下钢材的动态屈服强度提高至静态屈服强度的3倍.

Using LS-DYNA software,the dynamic response of simply supported H-section steel beams with different proportional distances under blast load was studied by numerical analysis method.It is found that with the decrease of proportional distance,the beam changes from elastic deformation stage to plastic deformation stage.When the charge quantity is very small,plastic deformation occurs at the flange edge of the top of the beam just below the explosion point and increases with the decrease of the proportional distance.Considering the strain rate effect of steel,the dynamic yield strength of steel under explosive loading with smaller proportional distance(larger charge) is increased by three times as much as that of static yield strength.