摘要:
组合箱梁结构刚度计算采用换算截面法没有考虑钢梁与混凝土翼板之间的滑移效应,使组合箱梁刚度较实际刚度偏大而变形较实测值偏小.利用Goodman弹性夹层假设,引入轴线滑移函数考虑组合箱梁轴线变形引起的滑移效应,通过组合箱梁受力平衡方程推导出钢-砼组合箱梁考虑滑移效应的变形平衡微分方程,得出方程相应的通解,根据边界条件获得钢-砼组合箱梁的变形表达式.算例应用计算结果表明,该分析方法能准确方便地求解钢-砼组合简支直箱梁变形,同时可得到钢-砼组合箱梁的内力,为钢-砼组合箱梁的安全设计提供理论依据.
Abstract:
On the basis of previous study,stiffness calculation of the steel-concrete composite box girders is adopted to the transformed section,and the effect of slipping is not be considered in the Rigidity calculation.Because of the effect of slipping,the calculated stiffness is slightly larger than the actual stiffness of the steel-concrete composite box girders but the deformation is relatively small,which is not safe in the deformation.Using Goodman elastic multiplayer assumption,the effect of slipping of the Axis Deformation is considered by the function of the Axis slip.On the basis of the force and geometric equilibrium equation,the deformation differential equation of the steel-concrete composite box girders based on the effect of slipping is presented,so the general solution is obtained.According to the boundary conditions,the computational expressions of the deformation based on the effect of slipping are acquired.By the application of an practical engineering example,the research results show that this theory is correct and convenient to solve the problem of the deformation of the steel-concrete composite box girders,and arbitrary crossinternal forces of the steel-concrete composite box girders are obtained.The research results can provide the theoretical basis for the safety design of the steel-concrete composite box girders.
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