Design of Latticed Steel-Concrete Joint Section of Danjiangkou Reservoir Bridge
The Danjiangkou Reservoir Bridge is a two-pylon cable-stayed bridge with a main span of 760 m,featuring pairs of stay cables anchored to the ground.The stay cables are arranged in double cable planes.The superstructure in the main span consists of two lateral steel box girders connected by composite light deck panels of orthotropic steel plates and UHPC overlay.The superstructures in the side spans consist of two lateral PC box girders.The transition between the composite girders and the PC girders measures 6.0 m long,specifically a 1.0 m-long steel girder segment,a 3.0 m-long steel girder strengthening segment,and a 2.0 m-long steel-concrete joint segment.Against the exterior webs of the box girders and the cells of the wind vanes,a latticed section is created,with which a structure contains a steel latticed chamber and a rearing bearing plate is formed,aiming to allow the smooth stiffness transition between the steel and concrete box girders,alleviate stress concentration and facilitate the pouring of infill concrete in the latticed chamber.PBL connectors and shear studs are arranged for the connection of the steel and concrete components,to improve the shear strength and ductility of the joint section,and the reliability of the overall connection as well.The latticed chamber is filled with reactive powder concrete with a mix proportion optimized in accordance with the mechanical property of the structure and technical requirements,thereby enhancing the durability of the steel joint section and the construction reliability.The mechanical property analysis demonstrates that the load bearing performance of all the components meet the design requirements.
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