基于设计层面的优化桥梁计算模型研究

A Bridge Computational Model Based on Design Level Optimizeation

以工程实例为背景,对于一座人行异形钢管混凝土拱桥分别建立仅考虑最大冲刷线以上墩柱结构的局部模型和考虑桩土共同作用的整体模型,该桥的设计计算采用的是局部模型,即未考虑桩土之间共同作用的影响。通过两种有限元计算模型内力结果的比较分析,得到一些实用设计分析有益的结果;另外还通过选择不同钢管拱肋的壁厚和钢管直径,探讨分析了钢管壁厚、直径对拱肋的受力及桥梁基频的影响;本文的研究结果可为同类桥型的设计计算及概念设计提供参考。

This paper is based on a engineering example which is a pedestrian special-shaped concrete-filled steel tube arch bridge. Set up two models which are the pier structure of local model above the Maximum scour line and the overall model which consider pile-soil interaction. The bridge’s design and calculation uses the local model, namely not considering the influence of pile-soil interaction. Though compare and analyze the results of internal forces between the two kinds of finite element models, get some beneficial results about practical design and analysis.In addition, by choosing different wall thickness and pipe diameter of steel tube arch rib,analyzes the influence of the steel tube wall thickness, diameter on the stress of the arch rib and bridge’s fundamental frequency. The results of this paper could provide references about similar bridge’s design calculation and conceptual design.