钢筋钢纤维混凝土梁柱节点受剪承载力基于八面体强度的计算模型

针对钢筋钢纤维混凝土梁柱节点的受剪性能与承载力计算方法，采用混凝土八面体强度模型，并以国内外钢筋钢纤维混凝土梁柱节点相关试验数据为基础，对其进行了理论研究。建立了梁柱节点破坏时核心区混凝土正应力与剪应力之间的关系，提出了钢筋钢纤维混凝土梁柱节点受剪承载力计算方法，并分析了影响钢筋钢纤维混凝土梁柱节点受剪承载力的因素。结果表明，钢筋钢纤维混凝土梁柱节点受剪承载力随柱端轴压比、混凝土强度、节点核心区配箍率以及钢纤维含量特征参数的增加而增大；梁柱截面高度比对受剪承载力的影响较小。基于相关的试验数据，通过趋势分析验证了所提出的计算方法能够综合反映柱端轴压比、混凝土强度、节点核心区箍筋以及钢纤维含量特征参数的影响。研究结果可为钢筋钢纤维混凝土梁柱节点受剪承载力计算提供理论依据。

Calculation model for shear bearing capacity of steel fiber reinforced concrete beam-column joints based on octahedral strength

Aiming at the shear performance and shear bearing capacity calculation method of steel fiber reinforced concrete (SFRC) beam-column joints, on the basis of the octahedral strength model of concrete and the test data of SFRC beam-column joints with reinforcements in China and abroad, the theoretical research was studied. The correlation between the normal stress and shear stress of concrete in the joint core at failure was determined; a new calculation method for shear capacity of SFRC beam-column joints was established; and the influence of the factors on the shear capacity of SFRC beam-column joints was further studied. The results show that the shear capacity of SFRC beam-column joints increases with the increasing of the axial compression ratio, concrete strength, stirrup ratio and steel fiber content characteristic parameter in the joint core area, but depends little on the joint aspect height ratio. Finally, based on the experimental data, a trend analysis confirms that the proposed calculation method can synthetically consider the various affecting factors mentioned above. The research results can provide a theoretical reference for the calculation of the shear bearing capacity of SFRC beam-column joints.