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为了研究CFRP加固冷弯薄壁槽钢短柱的稳定承载能力,对腹板和翼缘均粘贴CFRP的试件进行了偏心受压加载试验。7根试件长度均为750 mm,其中1根为未加固的初始试件,其余6根在试件内侧和外侧同时粘贴50 mm宽CFRP,间距分别为50、100 mm和150 mm三种,粘贴CFRP为1层和2层。试验结果表明:粘贴2层CFRP且间距为50 mm和100 mm的短柱局部屈曲迟滞于整体失稳,其余短柱均先发生局部屈曲,且所有加固短柱的局部屈曲荷载和承载力均有不同程度的提高。CFRP间距与短柱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层的。当间距为50 mm,层数为2层时,偏心受压稳定承载力提高幅度最大,为12.1%。最后,采用ANSYS有限元分析软件数值模拟构件的偏心受压性能,对比了试验数据和数值模拟结果,二者吻合较好。通过粘贴CFRP,可以迟滞薄壁压弯短柱的局部屈曲,当CFRP层数相同时,CFRP的间距越小,加固后其稳定承载能力提高越大。
In order to study the stability loading capacity of CFRP strengthened cold-formed thin-walled channel short columns, eccentric compression loading test was carried out on CFRP specimens with both webs and flanges affixed. The lengths of the seven specimens were all 750 mm, of which one was the un-consolidated initial specimen and the remaining six specimens were bonded to the inside and outside of the specimen with 50 mm wide CFRP at 50, 100 mm and 150 mm intervals, respectively. Paste CFRP for the 1st and 2nd floors. The experimental results show that the local buckling lag of short columns with two layers of CFRP and the spacing of 50 mm and 100 mm is the global buckling, and the other short columns all have local buckling first, and the local buckling loads and bearing capacities of all the short columns have Different levels of improvement. When the ratio of CFRP spacing to web height is less than 1, the reinforcement effect is better, and the reinforcement effect of 2-layer CFRP is better than 1 layer. When the distance is 50 mm and the number of layers is two, the stability of bearing capacity of eccentric compression increases most greatly, which is 12.1%. Finally, the ANSYS finite element analysis software is used to numerically simulate the eccentric compression performance of the member, and the experimental data and numerical simulation results are compared. By affixing CFRP, the local buckling of the thin-walled short columns can be delayed. When the number of CFRP layers is the same, the smaller the spacing of CFRP, the greater the stable loading capacity will be.