提出了箱梁剪力滞效应计算中翘曲位移函数定义的新方法。由竖向弯曲荷载下箱梁截面的剪力流分布规律，定义符合箱梁各翼板剪切变形规律的剪力滞翘曲位移函数，该定义方法与箱梁剪力滞效应的力学定义完全吻合。通过对顶、底板具有不同厚度和内、外顶板具有不同宽度两种情况下的算例筒支粱在跨中集中力作用下的剪力滞效应对比分析，验证了基于剪切变形规律的剪滞翘曲位移函数对于箱梁剪力滞效应分析的精度和适用性。%A new theory is proposed to definition the shear-lag warping displacement tuncttons ot box girders. The distribution law of shear flow of box girder under vertical bending is calculated. Warping displacement functions corresponding to mechanism of shear lag effect is defined according to shear de- formation of flange plates. In order to verify applicability of new functions,shear lag of a simple suppor- ted girder with concentrated force acting on mid span is analysed concerning two models, which one is that top and bottom flanges have different thickness and another is that internal and external top flanges have different width. Comparising with shell finite method and reference results, it' s proved results based on the new warping displacement are more accurate.
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