钢-混凝土箱形结合梁斜拉桥在东海大桥的应用与展望

Application and Prospective of Cable-Stayed Spans of Steel-Concrete Composite Box Girder for East China Sea Bridge

介绍了东海大桥主航道桥首次采用钢-混凝土箱形结合梁斜拉桥方案的工程环境条件与技术构思,分析了这种新型结合梁斜拉桥的构造、力学、施工条件等特点及适用性。钢-混凝土箱形结合梁的采用拓宽了结合梁斜拉桥的应用范围,并在更大范围与混凝土梁、钢箱梁斜拉桥形成竞争,不仅为斜拉桥的发展增添了新的型式,也为今后大型跨海大桥采用斜拉桥提供了新的选择与实践经验。

This paper presents the environmental conditions and technical considerations for the cablestayed spans of steelconcrete composite box girder selected for the East China Sea Bridge over the main navigation channel, and analyzes the structures, mechanics, construction conditions and adaptability of such new type of cablestayed spans of composite girder. The application of the composite girder to the Bridge will broaden the range of the utilization of the cablestayed bridges, and still further, will make the cablestayed bridge of the composite girder better compete against those of the prestressed concrete girder and steel box girder, which will not only add new structure type to the development of the cablestayed bridges, but also will provide major cablestayed bridges over sea with new alternatives and practical experiences.