弯剪共同作用下的RPC梁截面分析程序探讨

为了研究配箍率对高强箍筋活性粉末混凝土梁抗剪性能的影响，开展6根配置HRB400级箍筋RPC梁的抗剪试验，考虑RPC的材料特征参数与钢纤维对斜截面承载力的影响，分析有腹筋与无腹筋梁在剪力传递机理及裂缝控制方面的差异，基于修正压力场理论，对开裂混凝土在拉、压应力下的本构关系及裂缝处的应力平衡条件进行适当修正，将弯矩效应叠加至纯剪作用建立RPC梁在弯剪复合作用下的分析模型,并根据弯剪复合作用采用MATLAB软件编制RPC梁斜截面抗剪强度分析计算程序,对RPC简支梁进行受剪强度分析，并将试验结果与计算结果进行对比分析，研究结果表明该计算程序能够较好地预测高强钢筋RPC梁的受剪承载力，具有一定的参考和实用价值。

Discuss the Sectional Analysis Program of RPC Beams under the Compound Action of the Bending and Shearing

In order to explore the influence of shear span ratio on shear behavior of RPC beams with high-strength stirrups, we tested six RPC beams with HRB400 Stirrups. Considering the characteristic parameters of RPC and steel fiber influence on the bearing capacity of inclined section, I constructed the section analysis model of RPC beam under the action of bending shear according to the difference between the RPC beams with and without stirrups in the shear force transfer mechanism and the crack control of the beam. I made a appropriate revision of constitutive relation of cracking concrete under tension and compression stress and stress equilibrium condition of cracks based on the modified compression field theory. The pure shear was overlaid with bending moment, I established an analysis model of RPC beams under the compound action of the bending and shearing and used MATLAB software to write a calculation and analysis procedure for shear strength on inclined section of RPC beams around it. The accuracy of the calculation method is analyzed by the ratio of the test results and the calculated results. The results show that the method can well predict the shear capacity of RPC beams, and it has a certain reliability and practicability.