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针对桥梁工程中常用的配斜筋钢筋混凝土梁剪压破坏的情况,视梁截面的剪力由剪压区混凝土、箍筋和斜筋共同承担,以修正压力场(MCFT)理论为基础,考虑斜筋对裂缝处应力的影响,通过建立平均应力和斜裂缝处局部应力平衡方程,结合混凝土的变形协调条件和材料的本构关系,分别对受压区和受拉区混凝土抗剪承载力做出计算,提出了极限抗剪承载力的计算方法,并与2根实验室自制配斜筋RC梁的抗剪承载力试验结果进行了对比。研究结果表明理论值与试验值吻合较好,验证了该方法的有效性,可为相关承载力计算提供参考。
Aiming at the shear failure of slant-reinforced concrete beams commonly used in bridge engineering, the shear of the cross-sectional area of beams is shared by concrete, stirrup and diagonal reinforcement in the shear zone. Based on the modified pressure field (MCFT) theory, By setting up the average stress and the local stress equilibrium equation at the diagonal crack, combining with the deformation coordination of the concrete and the constitutive relationship of the material, the shear strength of the concrete in the compression zone and the tension zone are respectively made Based on the calculation, the calculation method of ultimate shear capacity is proposed and compared with the test results of shear strength of two slab RC beams. The results show that the theoretical value is in good agreement with the experimental value, which verifies the validity of the method and provides a reference for the calculation of relevant bearing capacity.