Error Analysis In Construction Control Of Long Span Steel Box Girder Cable-Stayed Bridge

With the development of technology and traffic, the structure of cable-stayed bridge is widely applied for both its good capacity and beautiful shape in the modern structure of bridge. The construction of cable-staye bridge is a complex process, construction control is a critical factor to ensure the quality and security of bridge.Based on the construction control of Yangtze River Highway Bridge from Suzhou to Nantong, in this thesis , the construction process of cable-stayed bridge has been simulated with nonlinear software NLABS to find out unstress configuration of steel box girder and unstress length of cable for the completed bridges. From the basic ideal of geometric construction control method, the response of bridge under changes of various parameters, such as selfweight of steel box girder, stifness of cable , temperature, temporary load during construction process, has been analysed and corresponding conclusions have been achieved in order to ensure unstress configuration of steel box girder and unstress length of cable.A general concept of random structure system has been introduced to parameter identification of segment during construction process with regarding to correlation of construction factors and also related information of segment parameters has been introduced to identification process by considering the characteristics under changes of structure system during construction process. a method called posterior probability has been applied to identify parameter of bridge on the basis of construction data.