Research Of Mechanical Properties And Structure Detail For Railroad Two-Line Plate-Truss Composite Steel Truss Bridge

Along with our country high-speed railways rapid development, to the railroad bridge in the rigidity,the earthquake resistance performance, excellent dynamic behavior and so on has a higher request.Truss with orthotropic steel bridge deck is one of the relatively reasonable structural types in long-span bridges of high-speed railways,because of its great rigidty,good integrity, excellent dynamic behavior,making low noise etc.However,upper flanges of lower chords,longitudinal girders,transverse girders,transverse girders,as parts of the steel bridge deck,whose mechanical behavior are complex. Make design and analysis calculation rather difficult.In the dissertation, mechanical properties and Structure detail for railroad two-line Plate-truss composite steel truss bridge are studied deeply on the background of ZhaoZhai YingHe River bridge of the newly built railroad from Luohe to Fuyang.The main research works are as following:(1) The thesis reviewed the development of railroad steel truss bridge systematically and summarized the structural and the mechanical properties of plate-truss composite.Also the research status of calculation method was summarized.(2) On the basis of sufficient study on the constructive condition of the ZhaoZhai Yinghe River bridge,different types of bridges including bottom-road bridge steel box tie bar arched bridge,prestressed continuous concrete bridge and Plate-truss composite steel truss bridge were compared from economy, construction, design,etc. Plate-truss composite steel truss bridge was finally decided as the best optimized design scheme.(3) Research of structure size for Plate-truss composite steel truss bridge, the main truss shape and size reasonable choice, mechanical properties analysis of ZhaoZhai Yinghe River bridge has been made by using spatial panel-grider element and plane simplified calculation method.then,a sthdy and evaluation on different methods above in viem of calculation precision,computational cost and the applied range of analysis have been mead.(4) Calculation principle and matters needing attention for strength,stability, fatigue properties and connection are analyzed,also a bar member verification program has been compiled which was applied to check calculations the strength,stability, fatigue properties of the ZhaoZhai YingHe River bridge main truss.(5) Detail anaysis and research of Support,top-beam part,truss with orthotropic steel bridge deck for Plate-truss composite steel truss bridge.Combining with the analysis results,reasonale arrangement form and applicable range for long-span Plate-truss composite steel truss bridge with orthotropic steel bridge deck was discussed.