碳纤维布加固钢筋混凝土梁受力性能的试验的研究.pdfVIP

学科代码： 碳纤维布加固钢筋混凝土梁受力性能的试验研究 董江峰，王清远，邱慈长，何东，谭莲飞 （四川大学 建筑与环境学院，四川成都 610065 ） 摘 要：通过对 根矩形截面钢筋混凝土梁的静力加载试验，研究了碳纤维布不同加固方式对钢筋混凝土梁的破坏形态、刚度变 8 化、极限承载力、变形能力和裂缝开展情况的影响。试验分析了碳纤维布粘贴层数、粘贴角度、截面高度、试验梁是否预裂和混 凝土强度对加固效果的影响。试验结果表明，两种碳纤维布粘贴方式均可明显增强加固梁的极限承载力，改变加固梁的破坏形 态，改善加固梁的延性，延缓混凝土裂缝的发展，提高加固梁的整体刚度，加固效果明显；同时碳纤维布粘贴层数越多，加固梁 的极限承载力越大，但其提高程度并不与粘贴层数成正比；预裂梁加固后其极限承载力明显得到提高，但延性有所降低，变形能 力减弱；混凝土强度越高，加固后试验梁的极限承载力和变形能力提高程度越大，其中加固梁的变形能力受混凝土强度的影响较 大。 关键词：钢筋混凝土梁；承载力；力学性能；碳纤维布；试验研究 中图分类号： 文献标识码： 文章编号： Experimental study on mechanical behavior of reinforced concrete beams strengthened with CFRP sheets DONG Jiang-feng, Wang Qing-yuan, QIU Ci-chang, HE Dong, TAN Lian-fei (Department of Architecture and Environment, Sichuan University, Chengdu 610065, China) Abstract: This paper presents research on eight rectangular section beams strengthened with external bonded CFRP sheets to the tensile face or lateral face of the beam under monotonous loads. The failure modes , rigidity, ultimate strength, deformability and crack development are studied. The main experimental parameters including the amount of CFRP sheets in use, the angle of bonded CFRP sheets, the height of beam, whether or not the beam has been precracked, and the concrete strength. The test results indicate that both the way of bonded CFRP sheets can increase the carrying capacity greatly, change the failure mode, delay the crack development, and increase the rigidity of the strengthened beams. The ultimate strength and the ductility increase greatly with the numbers of CFRP sheets, but not proportional to the reinforcement numbers. Damage in advance may result in an increase in strength but a decrease in ductility. The higher