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中文摘要：
本文针对翼板沿截面宽度方向变厚度的混凝土箱梁,利用势能变分原理,建立单室混凝土箱梁的剪滞效应分析方法。基于选定的剪力滞翘曲位移函数,提出变厚度翼板的广义截面常数计算公式。针对常见的简支梁和悬臂梁,导出集中力和均布荷载作用下的考虑剪滞效应的纵向应力和竖向挠度计算公式。通过对算例混凝土简支箱梁的剪力滞效应采用板壳数值解和本文理论解的对比分析,验证本文分析方法的精度。通过改变翼板厚度,研究混凝土箱梁翼板厚度变化对剪力滞效应的影响规律。
英文摘要：
Directing against concrete box beams with flange thicknesses varying along the orientation of cross section,the variational principle of potential energy was applied to form the shear lag effect analysis method for single-cell concrete box beams. Based on the defined warping displacement functions, the formula for calcula- tion of generalized sectional constants of thickness varying flanges was put forward. For simplely-supported beams and cantilever beams under the action of concentrated forces and uniformly distributed loads, the formula for calculation of longitudinal normal stresses and vertical deflections was deduced in consideration of the shear lag effect. Comparing with the shell finite element solution to the shear lag effect of simply-supported concrete box beams in the numerical example, the theoretical results of the proposed formulae show good agreement. By changing the thicknesses of varying flanges, the law of varying flange thicknesses of concrete box beams influ- encing the shear lag effect was studied.
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