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| Design and Analysis of Railway T - frame Cable - stayed Bridge |
| LI Tian – en |
| (China Railway First Survey ; Design Institute Group Co. Ltd，Xi’an，Shaanxi 710043，China) |
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Abstract Research purposes ： The low tower cable - stayed bridge is between PC continuous beam bridge and PC cable - stayed bridges，which has good technical and economical index. But this kind of bridge is rarely applied in railway. This paper took a (136 A 136) m railway low tower cable - stayed bridge as an example， introduced the design characteristics，and drew some reference conclusions through analysis of the design. Research conclusions ：( 1 ) The stress characteristic of low tower cable - stayed bridge is quite the same as beam bridge. Suspension cable is equivalent to the external prestressed cable of main girder. Bridge tower is equal to the steering equipment of external prestressed cable. The stress of bridge is clear and the cable is efficient. (2) Height of the tower has little effect on stiffness，but contributed significantly to the main beams，and cable has an obvious effect for girder main tensile stress. (3) The structure of the main girder is large，the stress amplitude of cable is small，and the fatigue resistance is improved obviously compared with the full cable - stayed bridge. (4) For cable - stayed bridge，the vertical load sharing rate of cables is influenced by human factors，so low tower cable - stayed bridge cannot be defined by cable vertical load share ratio. (5 ) Under some special conditions， low tower cable - stayed bridge has great competitive advantage in the field of railway construction.
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Received: 14 October 2015
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2016, Vol. 33 
