预应力钢筋混凝土轻轨桥梁的有限元分析

建立了武汉轻轨桥梁的三维有限元模型,对普通钢筋采用一种分层的等效方法,对预应力钢筋采用修正的等效载荷法.将结构要素都纳入到有限元模型中,计算了几种典型工况作用下轻轨桥梁的应力和变形,并对计算结果进行了详细的分析和对比.验证了该桥梁的安全性,提出了对于该桥梁设计及三维有限元方法应用于轻轨桥梁设计的一些建议.

Finite Element Analysis of Prestressed Reinforced Concrete Light Rail Bridge

The stress distribution and dimensional work performance were studied by finite element method.An equivalent load method for prestress,laminated model of reinforcing steel bar in prestressed concrete were investigated.The geometry model including the toothed board,peephole were built.The material properties of concrete and steel were specified in AYSYS model and the design loads of the bridge were analyzed and transformed into the FEM code.The prestressed effects were calculated by equivalent load method based on Moorman's formula.The numerical computations were carried out with considerations of curve or linear prestress steel rebar,gravity,static loads and varying loads of the rails of the bridge.The results show that there exist lower compression stresses and very few tension stresses during light rail operations and the prestress plays a major role in the strength of the bridge while the reinforced steel bar only bear the local bending stress and shear stress effectively.