钢混互为强约束下板梁拓宽设计建造方法

Steel-Concrete Mutually Rigidly Restrained Slab-Girder Widening Design and Construction Method

摘要:

为兼顾桥梁拓宽工程的安全、美观和经济性，以某沿海桥梁为工程背景，提出一种采用钢混组合结构为旧桥横桥向结构外延进行桥面拓宽的改造方法。重点介绍了桥梁拓宽方法的具体结构设计和施工方法，通过理论计算验算了结构的承载能力和抗裂性能，并通过荷载试验进一步验证了拓宽后的桥梁工作性能。研究表明，基于桥梁拓宽方法，钢混可互相形成强约束，在确保了结构性能安全可靠的同时具有很好的景观效果和优良的经济性。

Abstract:

To balance safety, aesthetics, and economy in bridge widening projects, using a coastal bridge as an engineering case study, a widening method involving the transverse extension of the existing bridge deck using a steel-concrete composite structure is proposed. Detailing the structural design and construction methodology of this widening approach is focused on. The structural bearing capacity and crack resistance were verified through theoretical calculations, and the performance of the widened bridge was further validated via load testing. The proposed widening method facilitates strong mutual constraint between the steel and concrete components is demonstrated which ensures the structural performance is safe and reliable while simultaneously achieving excellent aesthetic integration and superior cost-effectiveness.