Abstract：Abstract:Research purposes： In this paper，based on the design of Zhuhai City to the airj^ort intercity railway Jinhai Combined Road with Railway Cable - stayed Bridge with 480 m center span，the three - dimensional model of tlie long span combined road and railway cable - stayed bridge has been establislied when taking into account the factors that should be considered in the design of long span cable - stayed bridge. The purpose is to compare the influence of different auxiliary pier，tower and the type of girder on the mechanical properties of the structure，and this can determine reasonable structure form. Research conclusions:(1) By using combined rail and road of same layer，the cable - stayed bridge with 480 m center span has the advantages of reasonable structure，and convenient to transition of separate construction，and will provide a great stiffness and a good vehicle - bridge dynamic，wind resistance，seismic resistance performances that can meet the requirements of structural strength and stiffness under various design load. (2) Side span must set up auxiliary piers to improve structure stiffness，and reduce the fatigue of cable and beam. The number of auxiliary piers and the space between them depend on the construction scheme and cost of side span. (3 ) Separate flat steel - box - girder section has a larger torsional rigidity， and a good wind resistance stability， by an analysis of wind - vehicle - bridge coupling vibration，the girder structure can provide a high comfort and safety. (4) The research results can provide the valuable reference for the structure selection of highway - railway cable - stayed bridge.
2017, Vol. 34 
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