宽幅钢箱梁若干设计要点研究

Research on Design Essentials of Wide-width Steel Box Girder

摘要:

随着经济建设的发展，桥梁宽度日益增加，宽幅钢箱梁被广泛的应用于各类工程实践，为探究此类结构的受力模式，以2×40 m跨径的宽幅钢箱梁为研究对象，建立三维数值分析模型。以典型工况为荷载条件，验证单梁法、梁格法及板壳单元法的设计精度，在此基础上，分析、归纳及总结了宽幅钢箱梁的受力特性，结合有限元分析成果及中外规范着重论述了宽幅钢箱梁横梁的受力模式及简化计算方法，提出了宽幅钢箱梁的设计建议，以期为类似结构的设计提供参考。

Abstract:

With the development of economic construction, the width of bridges is increasing. The wide-width steel box girder is widely used in various engineering practices. To explore the stress mode of such structures, taking a 2×40 m span wide-width steel box girder as an example, a 3D numerical analysis model is established. Based on the loading condition of a typical construction, the design accuracies of single-girder method, beam grillage method and shell element method are verified. On this basis, the stress characteristics of wide-width steel box girder are analyzed and summarized. Combined with the finite element analysis results and the standards at home and abroad, the stress mode and the simplified computation method of the cross beam of the wide-width steel box girder are specially discussed. The design proposal for the wide-width steel box girder is put forward, which can be referred for the design of the similar structures.