CFRP-混凝土-钢管组合柱抗爆响应数值分析

Numerical analysis of anti-explosion response of CFRP-concrete-steel double skin tubular columns

为了研究CFRP-混凝土-钢管组合柱抵抗爆炸冲击波作用的能力,基于大型显示动力分析软件ANSYS/LS-DYNA,应用ALE多物质流固耦合算法对CFRP-混凝土-钢管组合柱进行了抗爆动态响应研究,并分析了截面含钢率、截面空心率及轴压比等因素对组合柱抗爆性能的影响。研究结果表明:在爆炸荷载下,CFRP-混凝土-钢管组合柱的抗侧刚度和延性比普通混凝土-钢管组合柱更大,能有效地延缓组合柱的开裂与变形;增加含钢率可以有效地减少CFRP-混凝土-钢管组合柱柱中峰值位移和残余位移,提高组合柱的抗爆性能;在一定范围内增大空心率可以提高组合柱的抗爆性能,但过大的空心率会降低组合柱抗爆性能;在临界值内增大轴压比能够显著提高组合柱抗爆性能,但超过临界值后,再增加轴压比会削弱组合柱抗爆性能。研究结果可为该类构件的抗爆设计提供参考。

In order to study the ability of CFRP-concrete-steel double-skin tubular columns to resist explosion shock waves,based on large-scale display dynamic analysis software ANSYS/LS-DYNA,the multi-material fluid-solid coupling algorithm was applied to the CFRP-concrete-steel double skin tubular columns.The effects of factors such as section steel rate,section hollow rate and axial compression ratio on the anti-explosion performance of the composite column were studied.The results show that under the blast load,the lateral stiffness and ductility of CFRP-concrete-steel double skin tubular columns are larger than that of ordinary concrete-steel tubular double skin tubular columns,which can effectively delay the cracking and deformation;Increasing the steel rate can effectively reduce the peak displacement and residual displacement of the CFRP-concrete-steel double skin tubular columns and improve the anti-explosion performance;Increasing the hollow ratio within a certain range can improve the anti-explosion performance of the double skin tubular columns,but the excessive hollow ratio will reduce the explosion resistance;Increasing the axial compression ratio within the critical value can significantly improve the anti-explosion performance of the double skin tubular columns,but after exceeding the critical value,increasing the axial compression ratio will weaken the anti-explosion performance.The research results can provide reference for the anti-explosion design of this type of components.