铁路简支槽形梁横向抗弯设计方法研究

Research on Transverse Flexural Design Method of Simply-Supported Trough Girder in Railway

结合48 m简支铁路槽形梁,通过三维有限元整体空间分析,得出了恒、活载作用下桥面板和端横梁的横向弯矩分布规律,以及桥梁一些特征尺寸对其产生的影响,并与国内外简化设计方法作对比,最终总结影响槽形梁横向弯矩的直接和间接因素,明确简化方法的适用条件,并提出经济合理进行槽形梁横向设计的原则是:弱桥面板,强端横梁。

In combination with a simply-supported trough girder of 48 m span in railway,and on the basis of three-dimensional finite element software,the holistic special analysis was worked out and the analysis results were obtained,including the transverse-bending distribution regularities of the bridge deck and the end crossbeam under the dead loads and live loads,and including the influences of the bridge characteristic dimensions on the trough girder.Further,in comparison with the simplified design methods at home and abroad,the direct and indirect influence factors on trough girder transverse bending were summarized,and the applicable conditions of the simplified method were defined.Finally,an economical and reasonable principle for transverse flexural design of trough girder was suggested,that is: weaken the bridge deck and strengthen the end crossbeam.