钢箱梁结构在S形曲线桥梁中的应用研究

Application Research of Steel Box Girder Structure in S-shaped Curved Bridges

摘要:

相较于混凝土梁桥，钢箱梁结构具有轻质高强、抗弯扭刚度大、施工便捷及对周边环境低影响等优势，且更能满足曲线梁弯扭耦合效应显著的受力特性。以陇西渭河桥为工程背景，从桥位线形选择、结构选型、设计施工难点控制对S形曲线钢箱梁开展设计研究，重点分析了跨径、梁高、支座布置、板件稳定性、耐久性等关键设计因素。研究结果表明，钢箱梁结构对小半径曲线大跨梁桥具有很好的适应性，陇西渭河桥工程设计可为国内同类桥梁设计提供参考。

Abstract:

Compared to concrete beam bridges, steel box girder structures offer advantages such as lightweight and high strength, large bending-torsional stiffness, construction convenience, and minimal environmental impact. They are particularly well-suited for curved beams with significant bending-torsion coupling effects. Taking the Longxi Weih River Bridge as an engineering case study, this research focuses on the design of S-shaped curved steel box girders, analyzing key factors including bridge alignment selection, structural configuration, and construction challenges. The critical design aspects are studied such as span length, girder height, support arrangement, plate stability, and durability. The results demonstrate that steel box girders exhibit excellent adaptability for small-radius, large-span curved beam bridges, providing valuable reference for similar domestic bridge designs.