关键词: 钢筋混凝土, T形适筋梁, 表层嵌贴法加固, CFRP板条, 承载力与变形, 抗剪加固影响参数

Abstract: In order to recognize the effects of the pre-cracked degree and the shear strengthening parameters on the performance of the reinforced concrete beams, 9 T-section pre-cracked reinforced concrete beams strengthened with near surface mounted CFRP sheets are tested. The failure modes, internal force and deflections of the strengthened concrete beams are analyzed. The results show that the reinforcement by embedding the CFRP sheets remarkably improves the flexural ultimate bearing capacity. Under the micro-crack condition, the failure mode of all the beams strengthened with CFRP sheets is the debonding of the CFRP sheets from the adhesive layer of epoxy. The pre-cracked degree of the beams has little influence on both the ultimate bearing capacity and the failure modes of the strengthened concrete beams, but has bigger effect on the beam deflection. The bigger the pre-cracked degree is, the more the beam deflects. A better bending performance of the strengthened beams can be achieved if reliable shear strengthening is assured.