斜交箱梁桥剪滞效应的有限元分析

将薄板弯曲问题的广义协调元与平面应力问题的薄膜单元组合，得到平板壳元以分析斜交连续箱梁桥的剪滞效应．通过对模型试验值与有限元计算值的比较，证实了这一分析方法的有效性．以某斜交箱梁为例。分析了集中荷载、均布荷载作用下不同斜度斜交箱梁剪滞效应的纵、横向分布规律，并与相应正交箱梁进行了比较．结果表明，斜交箱梁的剪滞效应比正交箱梁更为显著，设计时必须充分考虑其剪滞效应．

Finite Element Analysis of Shear Lag Effect of Skew Box Girder Bridges

The generalized conforming element for thin plate bending and the membrane element for plane stress were combined to obtain a plane shell element to analyze the shear lag effect for continuous skew box girder bridges. Comparison between experimental and computed results proved the effectiveness of this analytical method in the three-dimensional analysis of skew box girder bridges. As an example, skew box girders with different degrees of skew were analyzed respectively to investigate longitudinal and transversal distributions of shear lag effect under concentrated or uniform force, and were compared with the corresponding right box girders. The result shows that a skew box girder has more remarkable shear lag behavior than a right box girder. Shear lag effect must be fully considered in the design of a skew box girder.