预应力混凝土梁受力全过程有限元分析

采用考虑材料非线性的有限元方法,选取适当的混凝土、普通钢筋和预应力筋的本构关系和单元类型,对6根预应力混凝土梁的受力全过程变形性能进行了非线性有限元分析,获得了梁的跨中弯矩-挠度曲线,受压边缘混凝土和预应力筋的荷载-应变曲线以及屈服位移、极限位移和位移延性系数等计算成果,与试验成果对比符合良好表明,基于ANSYS程序建立的有限元数值模型用于研究预应力混凝土受弯构件的变形性能是可行的.

Full-procedure Finite Element Analysis of Prestressed Concrete Beams Loaded

Based on the finite element method considering the nonlinear property of materials, the rational constitutive model and the element type of concrete, normal reinforcement and strand are selected, the full-procedure of load to deformation of 6 prestressed concrete beams are analyzed. The empirical results of the mid-span flexure to deflection curves of the heams, the load to strain curves of concrete at edge of compressed area and strand, the yield deflection, the ultimate deflection and the displacement ductility factors are obtained, which are in good agreement with the test results,this shows that the nonlinear finite element analysis based on ANSYS program is feasible to research the ductility property of prestressed concrete flexural members.