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为统一中国对加筋高性能砂浆加固RC梁抗剪性能的认识,以中国所做66根加筋高性能砂浆加固的钢筋混凝土矩形梁抗剪性能试验研究为基础,分析抗剪加固梁的力学性能和破坏机理;借助桁架-拱模型,考虑一次受力、二次受力、持载程度、加固筋类型、加固筋数量、混凝土强度等级等因素影响,建立加固梁抗剪承载力计算公式。研究结果表明:该加固技术采用高强钢绞线、钢筋网、钢丝网作为受力材料,虽然三者受力性能存在显著差异,但构件力学性能和破坏机理相似,按统一计算公式进行承载力设计是可行的;所提公式计算值与试验值之比的平均值为0.926,标准差为0.178,二者符合良好,且计算结果偏于安全,公式可用于实际工程计算。
In order to unify the Chinese understanding of the shear properties of reinforced RC beams strengthened with high performance mortar, based on the experimental study of shear behavior of reinforced concrete rectangular beams reinforced with 66 reinforced high performance mortar made in China, the mechanical analysis of shear strengthened beams Performance and failure mechanism of the reinforced concrete beam. Based on the truss-arch model, the calculation formula of the shear strength of the reinforced beam is established considering factors such as primary stress, secondary stress, load bearing capacity, type of reinforcement, number of reinforcing bars and concrete strength grade. The results show that: the reinforcement technology uses high-strength steel wire, steel mesh, steel mesh as a force material, although the three stress performance there are significant differences, but the mechanical properties and failure mechanism of the components are similar, according to the unified formula for bearing capacity design Is feasible; the calculated value of the formula and the ratio of the average value of 0.926, the standard deviation of 0.178, both in good agreement, and the results are biased to safety, the formula can be used for actual engineering calculations.