波折钢板-钢覆复合材料防撞设施抗撞性能

Crashworthiness performance of corrugated steel plate-steel clad composite anti-collision facilities

为探究撞击作用下波折钢板-钢覆复合材料防撞设施的撞击响应和破坏模式,采用非线性有限元软件LS-DYNA,建立了船-防撞设施-桥碰撞的数值仿真模型,比较计算结果与试验结果,验证数值模拟方法的有效性,并通过参数分析探明了船舶冲击速度、钢面板厚度、冲击角度对防撞设施防护性能的影响规律。结果表明:有限元方法可以准确模拟碰撞产生的钢箱变形,考虑钢材应变率效应方法获得的钢箱凹陷深度和加速度峰值与试验值误差均小于10%;冲击速度、钢面板厚度、冲击角度对防撞设施在实际应用中的防护效果有较大影响,防撞设施在不同撞击作用下均起到良好的防护效果,展现出其良好的抗冲击性能和广泛的适用性。

In order to investigate the impact response and failure mode of corrugated steel plate-steel clad composite anti-collision facilities,the nonlinear finite element model of ship striking bridge equipped with anti-collision facilities was built with LS-DYNA.The accuracy of numerical simulation method was verified by comparing the experimental and numerical results of impact tests on steel box.Parametric studies were conducted to clarify the influence of impact velocity,thickness of steel panel and impact angle on the performance of anti-collision facilities.The research results demonstrate that the finite element method can precisely predict the deformation of steel box.Considering the strain rate effect of steel material,the differences between the experimental and numerical results of sag depth and peak acceleration are both less than 10%.It is also found that impact velocity,steel panel thickness and impact angle have great influence on the protection effect of anti-collision structures.The anti-collision facilities have a good protective effect in different impact conditions,and exhibits its good impact resistance and wide applicability in bridge protection.