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利用能量变分原理推导了分析变截面连续箱梁剪力滞效应的微分方程 ;运用有限单元法求解微分方程 ,并分析了宁波通途桥在施工过程中的各个阶段与成桥后二期恒载作用下的剪力滞效应 ,得到了一些有助于设计的计算结果。
The differential equation of shear lag effect of continuous box girder with variable cross section is deduced by the theory of energy variation. The differential equation is solved by the finite element method. The influence of Ningbo Tongtu Bridge at different stages of construction process, Under the action of shear lag effect, some helpful results are obtained.