基于能量变分法的连续槽型梁桥剪力滞效应分析

Anslysis of Continous U-Shaped Girder's Shear Lag Effect Based on the Principle of Energy

基于能量变分法,推导出等截面连续槽型梁的剪力滞系数计算公式。以宁启铁路八百河大桥为例,对基于能量变分法和通过有限元模型计算得到的剪力滞系数进行对比分析,同时计算出槽型梁主梁顶板与道床板的有效分布宽度。推导得到的剪力滞效应计算公式,以及总结的相关规律,可为同类型桥梁的设计研究提供借鉴。

In the paper, Resisner E＇ s method was adopted to build the governing equation of shear lag effect in continuous U-shape girder. The results of shear lag ratio of a （40 ＋ 64 ＋ 40）m railway continuous U-shaped girder in an actual bridge obtained by using the finite elements method were compared with those by using the analytical method. At the same time, the effective width of the girder was also calculated. The computational formula and distribution law of shear lag effect offered in this paper can be referenced for the design and research of the same style bridges in the future.