宽翼缘组合梁结构剪滞效应计算分析与试验研究

Analytic Solution and Experimental Study on Shear Lag Effect of Steel-Concrete Composite Beams With Wide Flanges

剪滞效应将导致钢-混凝土组合梁翼缘板纵向正应力沿翼板宽度方向分布不均,从而产生不利的横向裂缝.因此,有必要深入研究剪滞效应对宽翼缘组合梁结构的作用机理,以便加以防范.根据组合翼板微元的变形协调条件和平衡微分方程,建立了薄壁双箱组合梁翼板横截面法向应力微分方程.在考虑两端简支的边界条件下,利用解析解法求得其解析应力解.最后给出算例,通过与室内试验结果进行比较,表明该文方法具有较好的精度和实用性.

The sheer lag effect of the steel-concrete composite beam leads to nonuniform distri- bution of longitudinal stress along the width of flange, thus probably producing disadvantageous transverse cracks. And so, it is necessary to further study the mechanism of shear lag effect of the steel-concrete composite beams with wide flanges, in order to prevent those cracks. The cross-section normal stress differential equation was established for the thin-walled double- room box composite beams, based on the combination of flange micro-trait deformation com- patibility condition and equilibrium differential equation; and the analytic stress solution was obtained with the simple-support boundary condition at both ends of the composite beam con- sidered. Finally, the analytic solution was compared with the results of model tests, to prove the accuracy and applicability of the presented method.