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利用变角空间桁架模型,根据钢纤维混凝土梁在扭转作用下的受力性能,考虑钢纤维的影响,根据力的平衡,得出钢纤维混凝土梁在纯扭作用下极限扭矩的计算公式。公式将钢纤维的作用等效为纵向和横向钢筋的面积来进行计算,与普通混凝土结构极限扭矩的计算公式衔接较好。最后,将公式计算的极限扭矩结果与已有文献中的试验结果进行比较,结果表明:公式计算精度较高,具有一定的使用价值。
Based on the truss model of variable angle space and considering the effect of steel fiber, the calculation formula of the ultimate torque of steel fiber reinforced concrete beam under pure torsional moment is obtained according to the force performance of steel fiber reinforced concrete beam under torsion and the balance of force. The formula calculates the effect of steel fiber equivalent to the area of longitudinal and transverse steel bars, which is in good agreement with the calculation formula of the ultimate torque of common concrete structure. Finally, comparing the result of the limit torque calculated by the formula with the test results in the existing literature, the results show that the calculation accuracy of the formula is high and has a certain value of use.