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Li Y.,Shenzhen City Bridge Bo Design Institute Co. | Li M.,Beijing Municipal Engineering Professional Design Institute Co. | Shi M.,Shenzhen City Bridge Bo Design Institute Co. | Li H.,Shenzhen City Bridge Bo Design Institute Co. | And 2 more authors.
Jianzhu Jiegou Xuebao/Journal of Building Structures | Year: 2013

Cantilever truss bridge with corrugated steel webs is a new type of bridge structure. Beam-wave interaction and corrugated steel web are mainly to solve the longitudinal shear problem of concrete-filled steel tubular truss. Cantilever mainly solves the problem of lateral bending problem. The bridge with corrugated steel webs forms longitudinal box structure, and concrete-filled steel tubular truss forms horizontal cantilever structure. The two cross sections formed during construction can effectively reduce the transverse width of box girder, and result in convenient transportation and installation. The upper end of the cantilever plate and the bottom of the box girder are fixed to the top and bottom of the truss respectively. The cantilever truss composite bridge with corrugated steel webs is then formed. The main bridge structure was analyzed using Midas/Civil 2010 finite element analysis program. The results show that, the space radiation concrete filled steel tubular piers stay in the elastic state; the first order natural frequency of the main beam is 2.65 Hz; the whole structure has a good rigidity; the first order buckling eigenvalue is 18.18, indicating good structure stability. Source


Li Y.,Shenzhen City Bridge Bo Design Institute Co. | Fang Q.,Huazhong University of Science and Technology | Zhang J.,Transportation Institute | Du H.,Shenzhen University | And 4 more authors.
Jianzhu Jiegou Xuebao/Journal of Building Structures | Year: 2013

The Shenzhen University 1# bridge adopt the double deck steel truss web prestressed concrete composite structure. The main structure of the space radiation concrete filled steel tubular piers can improve the beam flexure and torsion resisting performance without diaphragm condition. Steel truss web is an integral combination of nodes, using Twin-PBL bonding shear stud combination connection. Full bridge is prestressed by tri-directional steel wires. The upper and lower decks use both longitudinal and transverse prestressing to ensure the overall performance of structure, and a cantilever composite structure is formed; the triangular steel pipe concrete truss chord is prestressed to reduce the tensile bar stress, enhance the node connection, and satisfy the main beam shear demand in the absence of external prestressing. The main bridge is assembled without construction formwork. For the main bridge structure, Midas/Civil 2010 finite element analysis program was used for analysis. The results show that, the space radiation concrete filled steel tubular piers and the monolithic composite node stay in the elastic state; the first order natural frequency of the main beam is 1.13 Hz, the whole structure has good stiffness; the eigenvalue of the first order buckling is 74.6, indicating good structure stability. Source

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