矩形FRP-钢复合管混凝土短柱的轴压试验研究

EXPERIMENTAL STUDY ON RECTANGULAR CONCRETE-FILLED FRP-STEEL COMPOSITE TUBE SHORT COLUMNS UNDER AXIAL COMPRESSION

本文通过9根矩形FRP-钢复合管混凝土短柱的轴压试验,研究截面倒圆角、FRP类型、FRP层数对其轴压性能的影响。研究结果表明,对于矩形FRP-钢复合管混凝土短柱,倒圆角可改善其截面角部的应力集中效应,改善FRP在截面角部的受力,提升FRP的增强效果;FRP约束能够延缓和抑制钢管的局部屈曲,相对于钢管混凝土对比柱,FRP-钢复合管混凝土柱的承载力和延性均有显著提高;对比不同FRP类型,CFRP对承载力及屈服后刚度的提高优于BFRP。

Axial compression loading test of nine rectangular concrete-filled FRP-steel composite tube short columns（ CFCTs） were conducted to investigate the effects of rounded corners,the FRP layers and the FRP types on axial compressive performance of CFCTs. The results show that rounded corners can improve the stress concentration effects and the stress distribution of the FRP at the corners of the section,and increase strengthening effects exerted by the FRP. The FRP confinement can delay and suppress local buckling of steel tube,compared to concrete-filled steel tube columns,the strength and the ductility of CFCTs were significantly improved. Comparing the different types of FRP,CFRP exhibits much better effects on the enhancement of the strength and the post-yielding stiffness than BFRP.