钢纤维钢筋混凝土纯扭构件的有限元分析

摘要

In order to study the torsional behavior of steel fiber reinforced concrete by nonlinear finite element analysis software,the finite element model with high precision is established by rational constitutive relation,element type,material model,convergence criteria and sub steps.The results show that with the adding steel fiber such performance as torsional ductility and stiffness of concrete member can be im-proved and the cracking torque and ultimate torque can also be increased because of the crack resistance of the steel fiber.In addition,it proves that the steel fiber,which to some extent has micro reinforcement effect on controlling the crack expanding,cannot replace the stirrups.%运用有限元分析软件对钢纤维混凝土纯扭构件进行了非线性分析，通过合理地选取本构关系、单元类型、材料模型、收敛准则以及子步数得到与试验数据具有较高精准度的有限元模型，然后运用该模型分析钢纤维钢筋混凝土梁的受扭性能。结果表明，由于钢纤维的阻裂性能，掺入钢纤维可以使混凝土构件的抗扭延性和刚度等性能得到明显地改善，并且提高了受扭构件的开裂扭矩和极限扭矩；同时得出钢纤维有微加筋的作用，能够在一定程度上抑制斜裂缝的发展，但是不能完全替代箍筋的作用。