薄壁箱梁剪力滞效应计算方法研究

能量变分法是计算箱梁剪力滞效应常用的一种方法。随着我国交通的发展,大跨径、宽箱梁桥和曲线箱梁桥越来越多,大量的工程实际调查结果显示,用变分法计算出的结果与实际的箱梁的剪力滞效应有所出入。针对这一情况,运用能量变分法和有限元法两种方法对薄壁箱梁在集中力和均布荷载情况下的剪力滞效应加以计算,并对比分析二者计算结果的差异,从而为薄壁宽箱梁剪力滞效应计算提供一些参考。

Calculation of Shear Lag Effect of Thin-Walled Box Girder

Variation method is widespread adopted to calculate shear lag effect in thin-walled box girder under vertical bending currently. With the development of China＇s transportation, the number of long-span, wide and curved box girder bridges are increasing. According to a large number of engineering surveys, it is indicated the shear lag effect result are different between the variation theories and the actual engineering. Focus on the situation, the two methods of variation principle and finite element method are used to calculate the shear lag effect of thin-walled box girder in both concentration and the case of uniform load. Comparative analysis of the differences between the two results provides some reference for shear lag effect calculation of the wide thin-walled box girder.