Structure Analysis And Control Technology Study Of Yuncheng Xinhe Bridge

With the rapid development of modern science and technology, the continuous beam bridges increase extensively in bridge construction. Catering for needs of larger span, riding smoothness and comfortability, etc., prestressed concrete continuous beam bridges have become the main structural form of continuous beam bridge. Numbers of uncertain factors consist of the perplexity in the construction process of prestressed concrete continuous beam bridge. Therefore the priority issues in bridge constructions are the following: to guarantee the designated requirements of the bridge, to ensure the aesthetic performances, and to control stress in a reasonable range. So the analysis and construction control technology research of prestressed concrete continuous beam bridge structure is very necessary.This paper firstly introduces the development of concrete continuous beam bridges at home and abroad, the characteristics of continuous beam bridge construction and the necessity of construction control, secondly summarizes the relevant research of the continuous beam bridge construction control issues at home and abroad, and thirdly introduces the general situation of the continuous beam bridge construction control principle and the engineering background - Yuncheng Xinhe Bridge project. By researching on the theory and methods of continuous beam bridge structure analysis, the theoretical foundation is established for the analysis of the construction process and the application of the construction control technology.Subsequently this paper establishes the simulation model of Yuncheng Xinhe Bridge by means of finite element software midas Civil. With the assistance of structure simulation calculation, we comprehend the stress and deformation distributions and change regulations of the bridge beam in every construction stage, analyze shrinkage and creep effect and closure patterns of side span, and additionally setting precamber values, which applied to bridge construction control. The relevant work of construction monitoring are introduced in this paper, along with a brief introduction of the main bridge construction, on-site monitoring work, construction control and measures. We emphasize on the early age concrete compressive strength and elastic modulus test. The compressive strength and elastic modulus of concrete has great impacts on the structure analysis of large span prestressed concrete continuous girder bridge, while the early concrete strength property has greater impact on structure safety during the construction. And simultaneously we optimize the simulation model and analysis with the material parameters from experiments.Finally, this paper focuses on the optimization of construction method in state prediction. Based on modified Grey Model Theory, we make predictions and controls on elevation error. Analyzing the control results of Yuncheng Xinhe bridge construction, it is obviously proved the modified Grey Model Theory to be a success in the project: the bridge profile is aesthetic, and the bridge beam stress is controlled within safe range. This paper shows a successful construction control in the project, which to some extent deserves reference and application.