钢-砼组合箱梁考虑滑移时剪力滞效应分析

在假定的位移模式及相应的假定条件下,根据组合箱梁的应变表达式,采用虚功原理推导出平衡和变形协调方程。通过分部积分得到组合箱梁考虑相对滑移和剪力滞效应的微分方程以及相应的边界条件,利用差分法来求解带有边界条件的微分方程组。以带有悬臂翼板的钢 砼组合箱梁为例分析其考虑滑移时的剪力滞效应,通过算例可以看出砼板的应力随剪力连接件的刚度增大而增加,钢箱梁的应力和组合箱梁的挠度随剪力连接件的刚度增大而减小。

Shear Lag Analysis of Steel-concrete Composite Box Girder in Consideration of Relative Slippage

According to the assumed displacement patterns of composite box girders and the corresponding conditions, equations of the compatibility of deformation and the equilibrium of forces are constituted by adopting the virtual work theory. According to part integral, differential equations and boundary conditions are established in which the relative slippage and shear lag are considered. Different method are applied to solve the differential equations with boundary conditions. An example of steel-concrete composite box girders with cantilever is cited to illustrate this method. The concrete slab stress increases with the rigidity of the shear connectors. The stress of the steel box girder and the deflection of the composite box girder decrease with the rigidity increment of the shear connectors.