Pre-camber should be set for the steel-concrete composite beam to offset the deflection caused by loads,con-crete shrinkage and creep and other factors.In this paper,plate and shell elements and solid elements are used to describe the steel box girder and reinforced concrete bridge deck.The finite element model of long-span steel-concrete composite simply-supported beam is established,and the equivalent cooling method and the effective modulus method are used to de-scribe the effect of concrete shrinkage and creep.The long-term variation of the steel-concrete composite beam deflection is analyzed.Besides,the rationality of the calculation is verified by comparison with the measured value.Results show that the long-term deflection with shrinkage and creep of concrete is only 58％of the empirical pre-camber,which is not conducive to the linear control of the completed bridge.
关键词
钢混组合梁/预拱度/挠度/有限元/收缩和徐变
Key words
steel-concrete composite beam/camber/deflection/finite element/shrinkage and creep
维普
万方数据