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| Analysis on shear-lag effect of composite girders based on different parabolic warping displacement function |
| HE Yu-liang, XIANG Yi-qiang, LI Shao-jun, LIU Li-si |
| College of Civil Engineering and Architecture,Zhejiang University, Hangzhou 310058, China |
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Abstract A theory model was proposed for steel-concrete composite girders with considering the slip between the steel beam and concrete slab, shear deformation in the steel beam and the shear lag effect in the concrete slab. Different parabolic warping shape function accounting for the non-uniform transverse distribution of longitudinal displacements in the concrete slab and steel floor and transverse shear deformation of the girder web were introduced into the Newmark's model of the theory. Then analytical solutions for the simply supported composite girder under the uniform distribution load and concentrated load are derived. The theory model and the correctness of the analytical solution were verified by the results obtained on the model experimental study. Further analysis results of the parameters show that the shear lag coefficients in the concrete flange plate on the web and between two webs in the mid-span section decrease with increasing thickness of concrete flange plate and depth of steel beam. the shear lag coefficient in the concrete flange plate on the web decreases with decline of the ratio of width and span for composite girder and the shear lag coefficient in the center between two webs in the mid-span section increases with it. Compared with the case under the uniform distribution load, the shear lag effect in the mid-span section is more significant under concentrated load for composite girder. The variation of the slip stiffness has a negligible effect to the shear lag coefficient.
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Published: 01 November 2014
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基于不同抛物线翘曲函数组合箱梁剪力滞
为了建立一个能够同时考虑界面滑移、剪切变形和剪力滞三重效应的组合箱梁分析理论模型，在该理论模型中，基于Newmark组合梁滑移模型引入不同幂次抛物线翘曲函数描述组合箱梁顶底板应力横向非均匀分布，推导了简支组合箱梁在均布荷载和集中荷载作用下的解析解.采用试验验证了理论模型和解析解的正确性.参数分析结果表明，随着混凝土板厚和钢梁高度的增加，在跨中腹板和顶板中部处剪力滞系数下降；当宽跨比减少时，在腹板处剪力滞系数下降，在顶板中部处剪力滞系数略增加；与均布荷载相比，集中荷载对跨中截面的剪力滞系数影响较明显；由推导公式的计算结果表明，可以忽略滑移刚度变化对剪力滞系数影响.
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