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为了给混合配筋(混合配置FRP与钢筋)混凝土梁的设计应用提供参考,对已有抗弯承载力计算公式进行了对比分析,并通过将理论值与试验值的对比,证明了各公式的精确性和有效性。通过改变混凝土强度、钢筋强度、FRP筋种类、混凝土极限压应变以及有效配筋率等参数,采用理论分析的方法讨论了限定纵筋最大拉应变对理论计算结果的影响。结果表明:已有混合配筋混凝土梁抗弯承载力计算公式均是基于平截面假定,根据截面内应变协调和力的平衡得出,均能很好地预测试验结果,误差较小;但限定纵筋最大拉应变后的理论值偏于安全,因此,推荐设计时采用限定纵筋最大拉应变的混合配筋混凝土梁抗弯承载力计算公式。
In order to provide a reference for the design and application of concrete beams with mixed reinforcement (mixed FRP and reinforcement), the existing formula for flexural capacity was compared and analyzed. The comparison between the theoretical value and the experimental value proved that the formulas Accuracy and effectiveness. By means of changing the parameters of concrete strength, steel bar strength, FRP bar type, ultimate compressive strain of concrete and the effective reinforcement ratio, the influence of the maximum tensile strain of the longitudinal bar on the theoretical calculation results is discussed by theoretical analysis. The results show that the formulas for calculating the flexural capacity of existing hybrid reinforced concrete beams are all based on the assumption of flat section. According to the strain coordination and force balance in the section, the experimental results are well predicted with small errors. However, The theoretical value after the maximum tensile strain is biased to safety. Therefore, it is recommended to adopt the formula for calculating the flexural capacity of hybrid reinforced concrete beams that limits the maximum tensile strain of longitudinal reinforcement.