Four simple supported RC beams (one of them is comparative RC beam ) strengthened with CFRP have been tested at the different level loads. It was mainly conducted to investigate the effects of CFRP sheets reinforcement of shear strength. The experimental results indicate that the CFRP sheets can better increase ultimate shear capacity and crack width and deflection of mid span beams decrease visibly. According to the analysis based on the results of the experiments, it is demonstrated that the calculated results from existing shear capacity formulas are greater than experiment ones, therefore it is not safe for application. So the shear capacity formula about considering secondary load is put forward. It meets the experiment results well and can give reference to the application.%通过4个不同持续荷载下的CFRP加固梁抗剪试验,其中1个对比梁,3个不同荷载下的加固梁.试验结果表明,加固梁的极限抗剪承载力得到了提高,裂缝宽度和跨中挠度有所减小.发现现有的抗剪承载力计算公式远大于试验值,这是不安全的,进而提出了考虑二次受力的抗剪承载力计算公式,和试验结果吻合良好,具有一定的参考价值.
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