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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。
Based on the analysis of the failure characteristics and the shear mechanism of the steel-fiber reinforced concrete beam-column joints, the effect of randomizing the cracks to the distributed steel fibers is equivalent to the effective tensile stress of the steel fibers. Based on the modified pressure field theory (MCFT), the calculation model of the shear behavior of steel fiber reinforced concrete beam and column joints was established. The influence of steel fiber volume fraction and horizontal stirrup ratio in the core of core on shear strength was analyzed. The results show that with the increase of steel fiber volume fraction and horizontal stirrup, the shear strength of joints increases, but the effect of volume fraction of steel fiber is smaller than that of horizontal stirrup. Finally, a simplified formula for calculating the shear strength of beam-column joints of steel fiber reinforced concrete is proposed, which is connected with the formula of shear capacity of common reinforced concrete beam-column joints.