介绍了薄壁箱梁的剪力滞效应及其变分计算方法,并结合一实桥悬臂箱梁算例详细阐述了变分法计算箱梁剪力滞效应的过程,结果表明：剪力滞效应在薄壁箱梁桥结构中的影响不容忽视,已成为影响设计的重要因素。%The paper introduces the shear lag effect of the thin-walled box girder and its variation calculation methods,illustrates the process of the shear lag effect of the box girder of the variation calculation by combining with the cantilevel box girder of the factual bridge,and proves by the results that the influence of the shear lag effect can not be neglected in the bridge structure of the thin-walled box girder,so it can be the important factor influencing the design.
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