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| Design of Main Bridge Deck System of DaoQingzhou River Crossing Passage in Fuzhou |
| WANG Fan1, MA Zheng2, CAI Luan1 |
1. China Railway Major Bridge Reconnaissance & Design Institute Co., Ltd., Wuhan Hubei 430056, China;
2. Wuhan Technical College of Communications, Wuhan Hubei 430065, China |
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Abstract The main bridge of the Daoqingzhou river crossing adopts a double-layer variable-height prestressed steel truss composite girder scheme. The web members are triangular trusses. The main span is 276 m, the standard truss height is 9.5 m, and the truss height near the fulcrum is increased from 9.5 m to 23.0 m. This bridge is a dual-purpose bridge for road and rail. Its biggest structure features: larger span, lower truss height, and heavier load. In order to share part of the main truss force, the upper road deck of the main bridge of Daoqingzhou cross-river passage adopts steel dense beams + concrete slabs which are combined with the beam system. The concrete slab and the steel beam are connected by shear nails. The prestress of the concrete slab is anchored on the steel beam; The lower track bridge deck adopts the integral bridge deck system of longitudinal and transverse beams + orthotropic slabs. The partial weighted section adopts a box structure, and the interior is filled with iron sand concrete for weight. In the position of truss height change, the advantages and disadvantages of two kinds of bridge deck systems, flat chord and no flat chord, are compared. At the same time, in order to meet the architectural appearance requirements of the triangular truss structure, the lower rail bridge deck adopts an innovative form of bridge deck structure at the variable height position, and it is the point-supported integral bridge deck system. The side longitudinal beams and box shaped crossbeams are set on the bridge deck system. A stable plane frame formed by side longitudinal beams and box shaped crossbeams, And through vertical supports, the rail deck system is supported on the corbels extended by the inclined web rods, and the structure is clearly stressed. In the aspect of force, a detailed structrucal calculation for the upper deck and the lower deck of the standard section is made. The calculation results show that the structural stiffness and stress are within the requirements of the specification. The more prominent torsion problem of the crossbeam is analyzed in-depth, and transverse bridge frame model and local finite element model are built for structural safety verification. In addition, for the position of Corbel force transmission, fine structural finite element calculation is carried out. Then the stress state of each component plate in this part is analyzed to ensure the safety of the structure.
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Received: 22 March 2021
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2023, Vol. 17 
