Analysis Of Reasonable Force System Of Dual-use Road And Rail Partially Cable-stayed Bridge

The partially cable-supported girder bridge is a new type of bridge structure inrecent years, which combines features of hardness and softness of both. We can makefull use of their strengths on the basis of their merits, such a bridge is becomingincreasingly broad. In terms of its structure type, main beam height is greater, sarasotais higher, cable-stayed is relatively is more; in terms of structural mechanicalcharacteristics, since the height of the main beam is higher, which bears a large part ofthe internal forces; the cable-stayed as a secondary load-bearing structure, which bears alot of tension. When the cable-stayed bridge is used as dual-use road and rail bridge, itsmain beam height increases, as a result, the main beam stiffness becomes bigger, andhas a larger bending、torsional capacity, also cable-stayed is needed to enhance therigidity of the main beam. Therefore, this kind of bridge could combine cable-stayedwith the main beam effectively, making a greater span of such bridge and forcing thestructure more reasonable.Taking Dongshuimen Yangtze River Bridge in Chongqing as relying engineering,we will arrive at a reasonable theoretical data through more detailed theoretical analysis,on this basis, which would support the design and construction of such bridges. SinceDongshuimen Yangtze River Bridge is a single cable plan dual-use road and rail bridge,this bridge is a single cable plane surface, therefore, in road and rail traffic loads,proposing the higher requirements for this cable-stayed structure, combined with thestructural characteristics of the bridge, from the various structural parameters of thebridge,which we study on the impact of the reasonable force system, ultimately weextract the reasonable parameters. This paper will be focusing on studying theseparameters: tower span ratio, the main high-span ratio, changes of zone without cable anso on. Which are some sensitivity performance parameters of the bridge. Thus wesummary up the overall structure of the force characteristics of Dongshuimen YangtzeRiver and the reasonable force system, providing a reference for the same type of bridgedesign.This paper takes the maximum positive moment, the main minimum negativemoment, the main beam minimum displacement and the moment of bottom of the toweras the structure force indicators. This indicators are very sensitive to the change ofstructural design parameters, thus we must take indicators into account when studyingthese parameters. But the data of indicators are very large, also the internal and displacement units are not the same. In order to facilitate research, the structure forceindicators are converted into dimensionless index, we can draw the cable-stayed bridgereasonable force system by studying into these dimensionless indexes.