Abstract：Research purposes: 1 － 80 m prestressed concrete tied arch was used in yellow sand river bridge of guiyang － guangzhou railway，which is the largest prestressed concrete tied arch span( concrete arch) in china，with wide single box and three grid． There is no Clearly defined of The Effective width and thickness ratio of side and middle web，the same as Simplified model for horizontal ring box． According to 80m tied arch bridge’s 3D finite element analysis by the midas FEA software was done for structural safty，and also for the disscusion of the structure’s size and prestressing layout．
Research conclusions: The concrete stress of the bridge is at a reasonable level，the structure is safe and reliable; The distribution of the beam normal stress is non － uniform，beam stress distribution in section away from the arch foot is more uniform; The vertical and horizontal diaphragm separator system，which was made by the multiple webs and multi － diaphragm plates，can make a strong overall performance of the bridge structure of the Department，the maximum Transverse displacement difference is only 0． 51mm; It is necessary to set vertical prestressed tendons for the foot of the arch which can reduce the interface with the concrete beam principal tensile stress effectively，and enhance the interface shear strength．
Zhu Min，Wang Yujue，Yang Yongyi，etc． Research on the Design of Railway Tied Arch Bridge［J］． Journal of Railway Engineering Society， 2009( 10) : 32 － 35．
Wei Jian，Li Yan ． Research on the Design of Tied Arch Bridge of Chengdu Railway Third Ring Road Railway Interchange［J］． Railway Standard Design，2006 ( 2 ) : 36 － 38．
Cheng Xiangyun． Research on Lateral Calculation of Top Flanges for Twin － cell Box Girder ［J］． China Journal of Highway and Transport，1996( 4) : 65 － 69．
You Lihui． Experience Research of Stress Analysis about the Connection Area of the Beam and Arch of Reinforced Concrete Tied － arch Bridge［D］． Chengdu: Southwest Jiaotong University，2006．
Pei Ruojuan， Zong Jindong， Li Chaofeng． Stress Analysis of end Joint for Long – span Oblique Arch Bridge on High – speed Railway［J］． Journal of Railway Engineering Society，2002( 1) : 23 － 28．
2012, Vol. 29 
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