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| Research on the Structure Form of Bridge Deck System of Steel Truss Girder Bridge for Sino - Russian Tongiang Bridge |
| LI En – liang |
| (The Third Railway Survey and Design Institute Group Corporation，Tianjin 300142，China) |
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Abstract Research purposes ： Normally，with the length of steel truss over 80 m，bridge deck system should set stringer break - joint, to reduce joint force the bridge deck system bears in main structure. 108 m steel truss decking of Tongjiang Heilongjiang Railway Bridge adopts light - weight deck structure with pretensioned prestressing concrete track bed by bolting horizontal and longitudinal beams. In order to adapt to the layout of track bed，improve the smoothness of the track and reduce maintenance workload of bridge structure， comparative analysis is conducted through the establishment of finite element model，to investigate feasibility of setting continuous vertical beams in the steel truss deck system of the bridge.
Research conclusions:With continuous vertical beam，the effect on bridge deck system within the integral steel beam is enhanced，to alleviate the stress on the main truss，especially the lower chord. Axial tension of the longitudinal beam increases significantly，causing the enlargement of external bending moment of the horizontal beam especially the end of it，and the enlargement of the horizontal deflection. The setting of joint brackets causes slight increase in the longitudinal axial tension，but greatly reduces the external bending moment of horizontal beam and horizontal deflection，longitudinal cross - section should appropriately increase to meet the needs of its own strength. The research results can provide valuable reference for the design of similar bridges.
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Received: 22 July 2015
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2015, Vol. 32 
