表层嵌贴CFRP板加固RC梁的抗弯性能

Flexural behavior of RC beams strengthened with near surface mounted CFRP strips

利用ABAQUS有限元软件对表层嵌贴碳纤维增强复合材料(carbon fiber reinforced polymer/plastic,CFRP)板加固钢筋混凝土(reiforced concrete,RC)梁的抗弯性能进行非线性有限元分析.通过模拟5根表层嵌贴CFRP板加固RC梁,并将数值模拟结果与试验结果、理论计算结果进行对比,以此验证所建模型的正确性.利用验证后的有限元模型深入分析嵌贴长度、开槽数量、加固方式、纵向配筋率对RC梁抗弯性能的影响.模拟结果表明:嵌贴长度和纵向配筋率对RC梁的抗弯性能影响较大;开槽数量、加固方式对RC梁的抗弯性能影响较小.另外,提出了CFRP板的界限加固量公式.

This paper uses the finite element software ABAQUS for nonlinear finite ele- ment analysis of the flexural behavior of reinforced concrete （RC） beams with near-surface mounted （NSM） carbon fiber reinforced polymer/plastic （CFRP） strips. Through simulation of 5 beams with NSM CFRP strips from the test, the experimental and theoretical results were compared to verify accuracy of the model. Using the verified finite element model, the influence of factors were analyzed such as FRP length, groove number, reinforcement method and longitudinal reinforcement ratio on the flexural behavior of RC beams. The results show that the CFRP length and longitudinal reinforcement ratio have a larger impact on the flexural behavior of the RC beams, while the impacts of groove number and reinforcement method are limited. This paper also proposes a boundary reinforcement quantity formula for CFRP strips.