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对6根无机胶(氯氧镁水泥)粘贴CFRP布加固混凝土梁、1根有机胶(环氧树脂)粘贴CFRP布加固混凝土梁和2根对比混凝土梁进行了受弯试验研究,分析了无机胶粘贴CFRP布加固混凝土梁的受弯破坏特征、承载力、刚度、延性,并探讨了粘结胶类型、CFRP布加固量、纵筋配筋率、锚固情况等因素的影响。试验结果表明,无机胶加固梁都发生剥离破坏,梁底CFRP布发挥的有效拉应变约为0.005;无机胶粘贴CFRP布能提高梁的刚度、承载力、约束裂缝发展。根据试验分析,建议了无机胶粘贴CFRP布加固混凝土梁受弯剥离承载力的计算方法,计算结果与试验数据吻合较好。研究结论对推动碳纤维布加固混凝土结构技术的发展具有一定参考价值。
CFRP-reinforced concrete beams with 6 inorganic gels (magnesium oxychloride cements), 1 organic glue (epoxy resin) bonded CFRP-reinforced concrete beams and 2 comparative concrete beams were subjected to flexural tests. The effects of inorganic gels The flexural failure characteristics, bearing capacity, stiffness and ductility of concrete beams strengthened with CFRP sheets are also discussed. The effects of adhesive type, CFRP sheet reinforcement, longitudinal reinforcement ratio and anchorage condition are discussed. The test results show that both the inorganic beam and the reinforced concrete beams are peeled and damaged, and the effective tensile strain of the CFRP cloth at the beam bottom is about 0.005. The inorganic glued CFRP cloth can improve the rigidity, bearing capacity and restrained crack development. According to the experimental analysis, the calculation method of flexural peel bearing capacity of CFRP-reinforced concrete beams with inorganic adhesive is suggested. The calculation results are in good agreement with the experimental data. The conclusions of the research have some reference value to promote the development of the technology of CFRP reinforced concrete structure.