Study On Reasonable Calculation Model Of The Stiffening Girder Of Suspension Bridge

The suspension bridge is used widely for its simple structure, clear force and high utilization efficiency of materials, especially in large long-span bridge. Along with development and progress of teleology, the suspension bridge' s stiffening girder, bridge decks and combinations of them have occurred the huge change. Mechanical Behavior of them are also different each other because of its combination of different forms.This thesis reviews the developing history and theoretical calculation method of suspension bridge. Based on Chongqing Zhongxian Yangtze River Bridge - a 560m single span suspension bridge with double articulations, this paper simulates and theoretically analyzes the current state of this bridge. It is concluded that the bridge decks of this kind long-span suspension bridge will work with stiffening girder and it also has negative effects to the stress of bottom chords of Stiffening Girder.To clear the stress relations between bridge decks and the steel tube truss stiffening girder of Zhongxian Yangtze River Bridge, this paper establishes two kinds space analysis model for this bridge, namely: the interaction model of the bridge decks work with the stiffening girder together and the traditional model not work with the stiffening beam. The result of the analysis and comparison between two models is the stiffening girder will be affected negatively by the bridge decks in live load. These are different from the traditional design theory - the stiffening girder is the main structure bearing load of the beam of Suspension Bridge. Obviously, the neglect of this influence will let the bridge being in risk. In order to verify this conclusion, the thesis also compares horizontally with the results of ABAQUS and MIDAS. The result is basically same. In addition, based on the theory calculation and analysis, the fact is verified by on-site load testing of ZhongXian Yangtze River Bridge, that the bridge decks work with Steel Tube truss Stiffening girder. According to the above, the Reasonable Calculation Model of steel tube truss stiffening girder of ZhongXian Yangtze River Bridge is the bridge decks working with stiffening girder together.