New Type of Composite Girder Design and Research on Key Mechanical Behavior of JiaoJiang Second Bridge

摘要

JiaoJiang second bridge is a 5-span continuous cable-stayed bridge with double pylons and double cable planes whose main span is 480m. The main girder's cross section has used a new type of composite beams --Semi-enclosed steel box composite girder, this article describes the design concept of this new type of composite girder, researched and analyzed the overall mechanical behavior of the composite girder, the spatial bearing behavior of the composite girder's connecting piece, the segmental assembling technology of the composite girder and the mechanical behavior of its connecting piece by means of experiment and finite element calculation, then looks forward to the popularization and application prospect of this new type of composite girder.