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基于Gjelsvik组合梁滑移模型中引入描述组合梁翼板横向非均匀分布的纵向位移翘曲函数,建立一个能够同时考虑界面滑移和翼板剪力滞双重效应的钢-混凝土组合梁模型,并推导了简支组合梁在均布荷载和悬臂梁在梁端集中荷载作用下的解析解。采用有限元方法验证了理论模型和解析解的正确性和适用性。算例分析表明,组合梁的剪滞效应和界面滑移效应存在耦合关系,界面剪切刚度的降低使剪力滞效应得到缓解,但是界面滑移和组合梁的挠度相应增大,翼板厚度对组合梁剪力滞效应影响不明显,不同荷载类型所产生的有效宽度系数沿梁轴方向的分布有显著差别。
Based on the Gjelsvik composite beam slip model, a longitudinal displacement warping function is introduced to describe the lateral non-uniform distribution of composite beams. A composite steel-concrete beam model which can simultaneously consider the dual effects of interface slip and wing shear lag is established. The analytical solutions of simply supported composite beams under uniformly distributed load and cantilever beam concentrated loads are deduced. The correctness and applicability of theoretical model and analytical solution are verified by finite element method. The case study shows that there is a coupling relationship between shear lag effect and interface slip effect, and the shear lag effect is alleviated by the decrease of interface shear stiffness, but the deflection of interface slip and composite beam increases correspondingly. The effect of shear lag effect on the composite beam is not obvious, and the distribution of effective width coefficient produced by different load types along the beam axis is significantly different.