内嵌碳纤维板条抗剪加固混凝土梁性能研究

Shear characteristics of reinforced concrete beams with near-surface mounted carbon fiber reinforced plastic(CFRP) strips

通过9根表层嵌入碳纤维增强塑料板条抗剪加固的钢筋混凝土梁和4根对比梁的静载试验,分析了构件的破坏形态、斜截面纤维应变分布特征及加固后极限承载力的影响因素。研究结果表明:嵌入式加固与外贴加固相比,可以明显地提高钢筋混凝土梁的抗剪承载力,并改变构件的变形性能。最后,在国内外研究资料的基础上,提出了加固后混凝土梁的受剪承载力计算公式,并对计算值与试验值进行了比较,结果吻合较好。

Based on the experiment of 13 reinforced concrete beams,the failure modes and strain distribution feature of CFRP strips by the oblique section and the influence factors of the ultimate bearing capacity of the strengthened beams were analysed. The beams included 9 beams strengthened in shear with near-surface mounted （NSM） carbon fibre reinforced plastic （CFRP） strips,2 beams strengthened in shear with external bonded reinforced（EBR） CFRP strips and 2 reinforced concrete beams. A calculation formulus of the bearing capacity for NSM CFRP was presented, which was verified by the experimental data. The experimental results indicate that NSM CFRP strips can evidently increase the shear strength and improve the ductility of the specimens compared to ERB CFRP strips.