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对一组无腹筋玻璃纤维增强塑料(Fiber Glass-reinforced Plastics,GFRP)筋混凝土梁的抗剪性能进行了试验研究,所有试验梁均为三分点加载,将6根试验梁按有效配筋率分为3组,每组包括1根钢筋混凝土梁和1根GFRP筋混凝土梁,且所有试验梁均为斜拉破坏;分析了试验梁的荷载-挠度关系、裂缝开展及抗剪承载力,并将各FRP筋设计规范或指南的抗剪承载力预测值与试验结果进行对比。结果表明:有效配筋率相同的钢筋混凝土梁和GFRP筋混凝土梁具有相近的抗剪承载力;修正的CAN/CSA-S6-06抗剪承载力预测结果与试验结果符合度最高,而ACI 440.1R-06的预测结果过于保守;建议的FRP筋混凝土梁抗剪承载力公式提高了承载力预测精度。
The shear performance of a group of non-reinforced reinforced concrete (GFRP) reinforced concrete beams was studied. All the test beams were loaded with one-third point. Six test beams were tested according to the effective reinforcement ratio Each group consists of one reinforced concrete beam and one GFRP reinforced concrete beam, and all the test beams are inclined to failure. The load-deflection relation, crack initiation and shear capacity of the test beam are analyzed. The predicted values of the shear capacity of each FRP tendon design specification or guideline are compared with the test results. The results show that the RC beams with the same effective reinforcement ratio and the GFRP tendons have similar shear capacity; the revised CAN / CSA-S6-06 shear strength prediction results are in good agreement with the test results, while the ACI 440.1 The prediction result of R-06 is too conservative. The proposed formula of shear strength of reinforced concrete beams increases the prediction accuracy of bearing capacity.