内嵌CFRP板条加固超载损伤钢筋混凝土梁试验研究

为研究超载情况下内嵌CFRP板条加固损伤混凝土梁的抗弯性能，进行了5根钢筋混凝土梁的抗弯试验，模拟了超载损伤状态，研究了加固梁的破坏形态、承载能力和刚度，分析了超载重复次数和超载幅值对加固梁抗弯性能的影响.试验结果表明:内嵌CFRP板条加固损伤混凝土梁可以提高梁的承载能力，提高幅度在16%~27%.超载重复次数和超载幅值影响加固梁的屈服荷载、极限荷载和刚度，屈服荷载和极限荷载随着超载重复次数和超载幅值增加而降低，刚度随超载重复次数的增加而减小.建立了承载力计算公式，理论计算结果与试验结果吻合良好.

Experimental Research on Overloaded Damaged Reinforced Concrete Beams Strengthened with Near Surface Mounted CFRP Strips

In order to investigate the performance of damaged reinforced concrete beams strengthened with near surface mounted (NSM) carbon fiber reinforced polymer (CFRP) strips under overloading， the bending test of five reinforced concrete beams was carried out. The overloading state was simulated， and the failure mode， capacity and stiffness were studied. The influences of the overload cycle number and overload amplitude on the performance of reinforced concrete beams were also evaluated. The results show that embedding CFRP strips can enhance the capacity of overloaded damaged reinforced concrete beams to about 16% to 27%. The cycle number and overload amplitude affect the yield and ultimate load and stiffness in different ways. The yield and ultimate load decrease with the increase of cycle number and overload amplitude. The stiffness decreases with the increase of cycle number. The formula of ultimate bearing capacity is established， and the calculated results agree well with the experimental results.