长细比对CFRP-铝合金管混凝土柱轴压性能影响研究

Numerical Analysis of Axial Compression Behavior of Concrete Columns Confined with CFRP Aluminum Alloy Tubes

为研究CFRP-铝合金管约束混凝土柱轴压性能,基于可靠的模型对铝合金管强度、长细比和CFRP层数进行了拓展分析,探讨了各影响参数对CFRP-铝合金管约束混凝土柱轴压性能的影响。研究结果表明,有限元软件模拟结果与试验结果吻合良好,极限承载力误差在10%以内;应力分析表明,该种组合柱的破坏特征为CFRP的断裂,在CFRP断裂之前铝合金管尚未屈服,达到峰值点后铝合金发挥约束作用,避免了脆性破坏;铝合金管强度的增大提高了对核心混凝土的约束,弥补了弹性模量较小的缺点,极限承载力最大提高了17.1%;长细比的增大导致试件发生失稳,从而降低了承载力;随着CFRP层数的提高,在试验范围内承载力最大提高了19.1%,层数在1~3层时提升效率较高。稳定系数与长细比的计算关系,吻合较好。

In order to study the axial compression performance of CFRP aluminum alloy tube confined concrete columns,the ABAQUS finite element software was used to model and verify the existing literature.Based on reliable models,the strength and slenderness ratio of aluminum alloy tubes were expanded and analyzed,and the effects of various influencing parameters on the axial compression performance of CFRP aluminum alloy tube confined concrete columns were discussed.The research results show that the simulation results of the finite element software agree well with the experimental results,and the error of the ultimate bearing capacity is within 10%;Stress analysis shows that the failure characteristic of this composite column is CFRP fracture.Before the CFRP fracture,the aluminum alloy tube has not yet yielded,and after reaching the peak point,the aluminum alloy plays a restraining role,avoiding brittle failure.The increase in the strength of aluminum alloy pipes improves the constraint on the core concrete,making up for the disadvantage of low elastic modulus,and the maximum ultimate bearing capacity increases by 17.1%.The increase in slenderness ratio leads to instability of the specimen,which reduces its bearing capacity.With the increase of the number of CFRP layers,the maximum bearing capacity increased by 19.1%within the experimental range,and the improvement efficiency was higher when the number of layers was 1-3.The calculation relationship between the stability coefficient and the slenderness ratio is proposed,and the calculated results agree well.