爆炸荷载作用下FRP管-混凝土-钢管组合柱动态响应的数值模拟研究

Numerical Simulation of Dynamic Response of FRP Pipe-concrete-steel Pipe Combination Columns Subjected to Explosive Loading

针对FRP(纤维增强复合材料)管-混凝土-钢管组合柱的抗爆性能,采用非线性有限元软件ANSYS/LSDYNA进行数值模拟研究。分析了组合柱在爆炸荷载作用下的破坏形态、不同比例距离以及不同厚径比情况下的动态响应。结果表明:在爆炸荷载作用下,组合柱损伤程度明显降低;随着比例距离逐渐增大,FRP材料组合柱的中部水平位移峰值显著降低;随着厚径比增大,组合柱刚度逐渐增强,组合柱中部水平位移峰值也显著降低。因此,该类组合柱具有优越的抗爆性能。可为该类型组合柱的抗爆设计以及进一步研究提供参考。

In this paper,the nonlinear finite element software ANSYS/LS-DYNA was employed to simulate blast resisting performance of FRP（ fiber reinforced compite） pipe-concrete-steel pipe combination column. Failure modes of the combination column exposure to blast shock loading,dynamic response of the combination column at different proportional distances,and the ratio of thickness to diameter were analyzed. The results show that under explosive shock loading,damage degree of the combination column is obviously decreased; with the increase of the proportional distances,the peak value of the middle part displacement of all kinds of combination columns significantly reduced; with the ratio of thickness to diameter increasing,stiffness of the combination column gradually increased,and the displacement peak in the middle of the combination column is significantly reduced. It is concluded that the combination column has excellent antiknock performance. It can provide reference for the further research with design of the FRP pipe-concrete-steel pipe combination column under blast loading.