预应力钢箱梁的应力分析

Stress Analysis of Steel Box Girder with Prestressed Tendons

根据预应力简支钢箱梁的受力特性,考虑预应力索与钢箱梁的相互作用,应用有限元软件ANSYS、MIDAS/Civil建立了预应力简支钢箱梁的有限元计算模型,有限元计算值与实测值吻合较好。采用有限元法对预应力钢箱梁跨中截面正应力进行了详细的分析,并对预应力索的不同布置形式及双折线索水平段长度变化对梁中应力分布的影响进行了讨论。

A finite element model of simply supported steel box girder with prestressed tendons was established in terms of the mechanical characters and the interaction of tendons and girder using software ANSYS and MIDAS/Civil. The calculation results of the model were found to be in good agreement with the experimental data. The normal stress of steel box girder with prestressed tendons at mid-span was analysed in detail by the method of finite element. Factors affecting girder stress were discussed, such as cable layout and length of horizontal segment in the case of beam with two deviators.