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通过10片普通钢筋混凝土(RC)梁及4片部分预应力混凝土(PPC)梁采用CFRP板抗剪加固的试验研究和非线性有限元分析,研究不同损伤程度、剪跨比、配箍率及预应力水平等因素对CFRP板加固RC&PPC梁抗剪性能的影响。结果表明:采用CFRP板对RC&PPC梁进行抗剪加固能够有效抑制斜裂缝的开展,提高加固梁斜截面抗剪承载能力,并改善梁的延性;RC梁损伤后加固,随着配箍率的增大以及剪跨比的减小,将提高加固RC梁的斜向开裂荷载、箍筋屈服荷载以及抗剪极限承载能力;随着预应力水平的提高,PPC加固梁的极限承载力增大,CFRP板抗剪加固效果比较显著;非线性有限元模型能够预测CFRP加固RC/PPC梁的抗剪性能,有限元计算结果与试验结果吻合良好;在进行CFRP板抗剪加固设计时,应对CFRP板的强度进行有效折减。
The experimental research and nonlinear finite element analysis of 10 RC beams and 4 PPC beams are carried out by using CFRP plate to study the effects of different damage degree, shear span ratio, stirrup ratio, Influence of Prestress Level and Other Factors on Shear Performance of RC & PPC Beams Strengthened with. The results show that the shear strengthening of RC & PPC beams can effectively suppress the development of oblique cracks and improve the shear capacity of RC beams, and improve the ductility of RC beams. The RC beams are strengthened after damage, As the prestressing force increases, the ultimate bearing capacity of PPC reinforced beams increases, and the ultimate load-carrying capacity of CFRP The shear-strengthening effect of the plate is more significant. The nonlinear finite element model can predict the shear resistance of CFRP-strengthened RC / PPC beams. The calculated results are in good agreement with the experimental results. When CFRP plate is subjected to shear reinforcement design, Effective reduction of intensity.