CFRP布加固钢筋混凝土梁的抗弯性能研究

摘要

首先,通过对一组外贴CFRP布加固的钢筋混凝土简支梁的抗弯承载力进行了理论公式计算,并总结出了各国加固规范给出的承载力计算公式的适用情况.其次,对同一组梁进行了有限元数值模拟,模拟了加固梁在四点弯曲荷载作用下的破坏过程,与试验数据进行了比较分析,验证了模型的合理性和有效性.最后,利用验证后的有限元模型进一步分析研究了相关参数对加固梁抗弯承载力的影响,提出了与配筋率相关的承载力修正系数,为加固工程实践提供了理论依据.%The theoretical formula to calculate the bending bearing capacity of simply supported RC beams strengthened with CFRP sheets was calculated firstly;and the applicable condition of strengthening codes in different countries was summarizd. Second;the finite element analysis was performed on the above RC beams. The failure process of four-point bending on the strengthened RC beams was simulated;and the comparative a-nalysis was done between the experimental results and the simulatied results. The correctness and effectiveness was verified. Finally;based on the finite element model which has been verified;further parameter studies on the bending bearing capacity of strengthened beams were carried out. The correction factor of bearing capacity related to reinforcement ratio was proposed. The model will provide theory basis for similar engineering strengthening.