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| Parameters Analysis of Structure System of Super Long-span Highway- Railway Combined Suspension Bridge |
| LUO Shi-Bong，XIA Zheng-chun , Yan Ai-guo |
| China Railway Siyuan Survey and Design Group Co. Ltd，Wuhan，Hubei 430063，China |
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Abstract Research purposes: The combined highway and railway bridge is a preferred choice for large span bay bridge，is also the needs of economic and social development. But，super long-span highway-railway suspension bridge is beyond the current design codes，and so far there is no the project instance which main span exceeds 2 000 m. Therefore，further studies are needed on some key technologies. Taking the feasibility study of a bay twin towers three span suspension bridge as the engineering background，this paper analyzes the effects of main design parameters on the suspension structure，which provide reference for theory research and engineering design in the future.
Research conclusions:(1)The reasonable side-middle span ratio of main cable is 0. 22-0. 33，and that of stiffened girder is 0.05-0.10. (2)The vertical stiffness and lateral stiffness can be improved through increasing the dead load of stiffened girder. ( 3)Increasing the train length can reduce the uneven force on the main cable， which avoid local large deflection of stiffened girder.(4)Reducing the rise-span ratio of main cable can improve the stiffness of the structure , but which led to increase the axis force of the main cable and the construction scale of the anchorage. (5)This paper concludes some rules and conclusions，which have valuable references to the similar super long-span bridge.
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Received: 30 December 2013
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2014, Vol. 31 
