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宽翼缘钢-混凝土组合梁结构中剪滞效应的存在将导致混凝土翼板、钢梁底板及腹板发生纵向翘曲变形,对组合梁截面应力和变形产生重要影响。为了深入分析其作用机理,该文基于最小势能原理,忽略界面滑移效应,在假定混凝土翼板、钢梁底板纵向变形沿板宽度方向呈近似抛物线分布的前提下,推导了宽翼缘双箱钢-混凝土组合梁结构考虑剪滞效应的控制微分方程。并求得在两端简支约束条件和集中荷载作用下的应力和变形解析表达式。通过数值算例,结合组合梁试验、有限元模拟三者相互比较分析,表明该文提出的方法为分析组合梁结构关于剪滞效应问题提供了理论基础,对工程应用具有一定的指导作用和参考价值。
The existence of shear lag effect in the wide flange steel-concrete composite beam structure will cause the longitudinal warping deformation of the concrete flange, the steel floor and the web, which will have an important influence on the cross-section stress and deformation of the composite beam. Based on the principle of minimum potential energy and neglecting the interface slip effect, based on the assumption that the longitudinal deformation of concrete slab and steel beam is nearly parabolic along the width of the slab, Control Differential Equations Considering Shear Lag Effect in Steel - Concrete Composite Beam Structure. The analytical expressions of stress and deformation under simple constraints and concentrated loads at both ends are obtained. The results of the numerical analysis and the experimental results show that the method proposed in this paper provides a theoretical basis for analyzing the shear lag effect of the composite beam structure and has some guidance for engineering application and reference value.