Abstract：Research purposes: To get more clear height of overpass railway bridge in electrified upgrading of existing railway，the structure with lower height should be designed to replace the existing beam，and in the meantime the upgrading work should not disturb the traffic of the existing railway．The application of orthotropic deck through steel plate girder to replace the existing 16 m prestressed concrete beam is discussed in this paper
Research conclusions:The orthotropic deck through steel plate girder is a kind of structure with two main girders connected with steel bridge deck stiffened by longitudinal and transverse beams to transfer the loads from bridge deck and longitudinal and transverse beams to main girders．Compared with prestressed concrete girder，this steel plate girder can reduce structural height and can be prefabricated in factory and assembled and erected in construction site．Replacement of existing concrete girder can be done and completed in skylight time，which can speed up the construction process．In addition，the ballast can be laid directly on steel deck，which call reduce the maintenance difficulty caused by open bridge floor．The mechanical performance of orthotropie deck through steel plate is discussed as well in this paper．This structure has already used in electrified upgrade of Beijing—Kowloon Railway successfully．
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TB 10002．2005．Code for the Designs of the SteelStructures in the Railway Bridges[S]．
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2010, Vol. 27 
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