复合扭转作用下钢纤维混凝土梁极限扭矩计算方法的研究

Study on the ultimate torsion of beams Reinforced with bars and steel fibers in bending,shear and torsion

根据钢纤维混凝土梁在弯矩、扭矩和剪力共同作用下的受力性能,考虑钢纤维对极限扭矩的影响,对三种破坏型式下钢纤维混凝土梁的极限承载力公式进行推导,并给出相应的计算公式.然后给出了实际构件破坏类型的判别公式及极限扭矩的计算方法.在公式推导过程中采用的原理、方法及推导出的公式形式与普通钢筋混凝土梁十分相似,具有良好的衔接性和实用性,为钢纤维混凝土梁进一步的研究应用及纤维混凝土规范的修订提供了有价值的参考.

Based on the mechanics capacity of beams reinforced with bars and steel fibers in bending,torsion and shear,and taking into account the influence of the steel fiber on ultimate torsion,the formulas on ultimate torque are given using the variable angle space truss model in three failure modes. Moreover the determination method of failure mode and ultimate torsion of beams in practice are given. The formulas suggest the same theory and method with the calculation formulas of common reinforced concrete beams,which can joint each other well. So the formulas can provide valuable reference for the use and modification of code of steel concrete.