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对6根预应力斜箍筋加固混凝土简支梁和1根对比梁进行了受剪性能试验。结果表明,该加固方法对混凝土梁的斜截面开裂荷载和极限荷载均有不同程度的提高,对梁斜裂缝宽度有一定的限制作用。基于桁架-拱模型理论,推导出预应力斜箍筋加固混凝土梁的理论计算公式。根据试验实测数据的回归分析,得到预应力斜箍筋加固混凝土梁在不同加固工况下预应力箍筋贡献的抗剪计算公式,计算结果与试验值吻合较好。
The shear performance of six prestressed concrete with stirrup and one comparative beam were tested. The results show that the reinforcement method can increase the crack load and the ultimate load of inclined section of concrete beam to some extent, and has a certain limiting effect on the width of oblique crack of the beam. Based on truss-arch model theory, the theoretical formula of reinforced concrete beam with prestressed stirrund is deduced. According to the regression analysis of the experimental data, the shear buckling formula contributed by the prestressing stirrup under different reinforcement conditions is obtained, which is in good agreement with the experimental data.