混合配箍混凝土梁最小配箍率分析
Analysis of Minimum Stirrup Ratio of Mixed Stirrup Concrete Beams

为研究基于等耐久性原理的混合配筋梁最小配箍率，对混合配筋构件最小配箍率的影响因素进行了分析，对各国规范最小配箍率的计算公式进行了介绍。进行了9根混合配箍混凝土梁的抗剪试验，验证了破坏模式以及最小配箍率下纤维增强复合材料（FRP）箍筋的应变范围。在美国ACI规范中混合配筋梁抗剪承载力公式及中国规范最小配箍率公式的基础上，对混合配筋梁的最小配箍率进行了理论分析，提出了混合配筋构件的最小配箍率计算公式。结果表明：该公式考虑了纵筋刚度对梁抗剪承载力的影响，简化后的公式形式简单明确，可以用于所有配箍梁，适合工程应用。
In order to study the minimum stirrup ratio of a mixed reinforcement beam based on the principle of equal durability，the influence factors of the minimum stirrup ratio of the mixed reinforcement component were analyzed, and the calculation formula of the minimum stirrup ratio in various countries was introduced. The shear test of 9 mixed reinforced concrete beams was carried out to verify the failure mode and the strain range of the FRP stirrups under the minimum reinforcement ratio. Based on the formula of shear strength of the mixed reinforced beam and the formula of minimum stirrup ratio in China, the minimum stirrup ratio of the mixed reinforcement beam was theoretically analyzed in the ACI code of the United States, and the formula for calculating the minimum stirrup ratio of the mixed reinforcement members was proposed. The results show that the formula takes into account the effect of the stiffness of the longitudinal reinforcement on the shear bearing capacity of the beam. The simplified formula is simple and clear. It can be used for all stirrup beams and is suitable for engineering applications