CFRP加固冷弯薄壁C型钢长构件的轴压承载力

Axial compression of slender cold-formed thin-walled steel channels strengthened with CFRP

为了研究CFRP加固冷弯薄壁C型钢长构件的承载能力,对腹板和翼缘均粘贴CFRP的试件进行了轴心受压加载试验。7根长度均为1 400mm的试件,其中1根为未加固的控制试件,其余6根封闭缠绕外贴50mm宽CFRP间距为50、100、150mm 3种情况,层数为1层和2层。试验结果表明,在轴心荷载作用下的破坏模式为整体弯扭失稳,与控制试件相比,加固后试件的稳定极限承载力均有不同程度的提高;当CFRP间距与腹板高度的比值小于1时,加固效果较理想,且2层CFRP的加固效果好于1层。最后,采用有限元对模型进行数值模拟,对比试验数据和数值模拟结果,二者吻合较好。

To study the stability capacity of long cold-formed thin-wall channel columns reinforced with CFRP, the axial compression loading test was carried out on them with CFRP around their webs and flanges. Seven columns, which are 1 400 mm long each, are consisted with one initial specimen and six strengthened with 50 mm width CFRP. The CFRP space is divided into three sorts, 50 mm, 100 mm and 150ram. And the CFRP layer has two kinds： one and two layers. The experimental results show that the global buckling happens to all the specimens. All the ultimate bearing capacity of the reinforced members is improved in different degrees. Meanwhile, the effect of the reinforced specimens wrapped with two layers CFRP is better than the others wrapped with one layer CFRP. Finally, based on the experiment, thenumerical simulation is carried out, and the test and numerical results show in good agreement.