基于MCFT理论的钢筋钢纤维混凝土梁柱节点受剪性能计算方法

在分析钢筋钢纤维混凝土梁柱节点破坏特征及受剪机理的基础上,将裂缝处乱向分布钢纤维的作用等效为钢纤维有效拉应力。基于修正压力场理论(MCFT),建立了钢筋钢纤维混凝土梁柱节点受剪性能的计算模型,分析了钢纤维体积率和节点核心区水平配箍率对受剪承载力的影响。结果表明,随钢纤维体积率和水平配箍率的增加,节点受剪承载力均有提高,但钢纤维体积率的影响较水平配箍率小。最后,提出了与普通钢筋混凝土梁柱节点受剪承载力计算公式相衔接的钢筋钢纤维混凝土梁柱节点受剪承载力简化计算公式。

Calculation method for shear behavior of steel fiber reinforced concrete beam-column joints based on modified compression field theory

Through analyzing the failure characteristic and shear mechanism of steel fiber reinforced concrete (SFRC) beam-column joints, the action of steel fibers disorderedly distributed in concrete can be treated by the effective tension stress. On the basis of the modified compression field theory (MCFT), a new calculation method for shear behavior of SFRC beam-column joints is established, and the influence of the steel fiber volume ratio and horizontal stirrup ratio on the shear capacity is studied. The results show that the shear capacity increases with the steel fiber volume ratio and horizontal stirrup ratio, but the efficiency of steel fibers is smaller than stirrups. Finally, the simplified calculation formula for shear capacity of SFRC beam-column joints has been set up in conjunction with that for calculating reinforced concrete beam-column joints.