Abstract：Research purposes: Gives the best bridge types of NiuJiaoPing major double track bridge, and studys various possible bridge types by considerations of the factors of road bridge site, landform and geological survey.
Research methods: Giving the best bridge type through the dynamic behavior analysis and investment analysis of the different bridge types.
Research results: The research achievements consist of these bridge types ; 256 m steel truss arch , 256 m steel pipe concrete arch,(110+192+119 ) m prestressed concrete continual rigid frame and(144+192+144 ) m bottom-road bridge continual steel braced girder.
Research conclusions: To long span railway bridge , the dynamic behavior of deck arch bridge with light beam structure is easy to meet with. To railway continuous beam bridge with long span and high pier, the dynamic behavior is better when using light beam structure; using concrete beam structure is more economic.
2007, Vol. 24 
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