Long Span Curve Structure And Properties Of Continuous Girder Bridge And Construction Of Control Technology Research

With consultant of plenty of related literatures at home and abroad, this paper summarizes the designation and construction methods of curved girder bridge and expounds the current situation of curved girder bridge study and its development. What's more, the properties of mechanics and its main influencing factors are analyzed in this paper, and a conclusion of analyzing theories is made as well. Taking the great bridge over Feiyun river as an illustration, this paper mainly performs the research of internal force of the inner and outer web plates, the reaction force of the media and lateral support saddles, and the girder deformation caused by various reasons through building the calculating model with the use of MIDAS software for different curve radius at different loading conditions. It proved that when the main span is 80m and the radius isn't less than 3500m, the linearity bridge analysis should be adopted with the consideration of the influence of centrifugal force, which accumulates invaluable experiences for the designation of the same type bridge.According to the characteristics of the cantilever construction continuous girder beam, some comparative analysis of the construction control methods have been presented in the paper based on the construction control of Feiyunjiang Bridge. Through taking adaptive control approach to conduct construction control, using Limit Element Method to simulate the construction phase, the internal force and deflection in each cantilever casting phase could be figured out. Besides, the errors have been analyzed by comparing with the measured data during the construction, so the next formwork elevation could be adjusted. Thus the results could be applied to the construction control of Feiyunjiang Bridge.Sensitivity analysis of parameters which will affect the alignment of the main beam has been investigated in this project. Through the calculation of the last cantilever phase as well as the whole bridge closed phase, it can be known that during the construction phase the main parameters that will affect the alignment of the beam are prestressing force, concrete volume-weight and concrete elastic modulus. And the influence of concrete creep can not be ignored in the construction control of long span girder bridge. In this paper, grey control theory which estimate and forecast structure state has been described in details, and it was applied in the construction control of Feiyunjiang bridge. Moreover, its application has realized a higher precision of linearity.