大跨度异形分叉钢箱梁设计与分析

Design and Analysis of Long-span Special-shaped Forked Steel Box Girder

摘要:

桥梁建设中匝道桥与主线桥交会区域往往呈现出多种非标准的分叉形态，以适应复杂地形和交通需求。以具体工程实例为依托，通过理论分析与工程实践相结合的方式，深入探讨了异形分叉钢箱梁的设计思路、腹板布置、构造细节，以及针对各跨桥梁宽度变化所采取不同的结构处理措施。并通过建立板单元有限元模型，对钢箱梁的应力分布及挠度变形进行了计算分析，结果表明结构各项指标均满足要求，整体变形协调良好，可为类似结构的设计提供了新的思路和实践参考。

Abstract:

In bridge construction, the intersection area between ramp bridges and mainline bridges often presents various non-standard bifurcation forms to adapt the complex terrain and traffic demands. Based on a specific engineering case, the design concept, web arrangement and construction details of the special-shaped forked steel box girder, and the different structural treatment measures for changes in bridge width with various spans are deeply discussed through the combined method of theoretical analysis and engineering practice. By establishing a finite element model of the plate elements, the stress distribution and deflection deformation of the steel box girder are calculated and analyzed. The results show that all indicators of the structure meet the requirements, and the overall deformation is well-coordinated, which can provide the new ideas and practical references for the design of similar structures.