钢-混凝土组合简支箱梁剪力滞效应分析

对于钢－混凝土组合箱梁，根据组合冀板微元的变形协调和平衡条件，建立横截面翼板法向应力微分方程。在两端简支的边界条件下采用分离变量法求解偏微分方程，得到用级数表示的应力解，然后根据剪力滞系的定义即可得到组合箱梁冀板的剪力滞系数。通过算例验证了该方法具有收敛较快、计算精度高等特点，且只需简单的计算不可得到较满意的结果。

A Shear Lag Analysis for a Simply Supported Steel-Concrete Composite Box Girder

A differential equation for calculating the normal stress at the transverse section of the flange of a steel concrete composite box girder is derived based on the compatibility of strain and the equilibrium of forces on an micro element of the flange section. Separation of variables is employed to solve the differential equation under the boundary condition of two ends of the girder being simply supported, and the solution of stress is obtained in the form of Fourier series. The shear lag coefficient is then obtained according to its definition. An application example proves the quick convergence and high accuracy of the calculating method presented in this paper, which also shows that satisfactory results are achieved through simple calculations.