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根据弹性状态下的斜弯理论及塑性状态下的沙堆比拟法,建立了钢纤维混凝土纯扭构件开裂扭矩的计算公式。以薄壁筒空间桁架比拟受扭开裂后的构件,依据空间桁架模型理论,将薄壁筒中钢纤维按体积相等原则等效为钢筋混凝土受扭构件中的箍筋和纵筋,建立了符合我国规范形式的钢纤维混凝土纯扭构件极限扭矩计算公式。通过对已有文献中139个构件的试验数据对比分析表明,建议的计算公式与试验值符合良好。
According to the oblique bending theory under elastic condition and the sand pile analogy under plastic condition, the formula for calculating the cracking torque of pure torsion steel fiber reinforced concrete members is established. Based on the theory of spatial truss model, the principle of equal volume of steel fiber in thin-walled tube is equivalent to the stirrups and longitudinal ribs in the torsion member of reinforced concrete Calculation Formula of Ultimate Torque of Steel Fiber Concrete Pure Torsion Member in China. The comparative analysis of the experimental data of 139 components in the existing literature shows that the proposed calculation formula is in good agreement with the experimental data.