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中文摘要：
不同于以往将荷载作用于箱梁的肋板处研究剪力滞效应，采用将对称的荷载作用于上翼缘板的其他横向位置，结合数值模拟的结果，以二次抛物线作为箱梁翼缘板的纵向位移函数，通过能量变分法，推导出荷载作用在横向任意位置时箱梁的应力，从而得到荷载在不同横向位置时箱梁剪力滞效应的变化规律．
英文摘要：
Different from the study of shear lag effect that load act on costal board of box beam, the shear lag effect of symmetrical loads acting at other lateral position of box beam is studied, and a quadric parabolic function is adopted to simulate axial displacement of box beam flange. In the procedure the energy method is used to educe stress and shear lag effect of the box beams,and the change rule of shear lag effect of the box beams with different lateral loading position is obtained in this paper.
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Analyses of the shear lag effect on the top and bottom plates of box beams with varying loading loca
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