Analysis Of Cable-stayed Bridge On Construction Control With Three-Dimension Model

The cable-stayed bridge is a structure with high degrees, of which internal force and configuration are closed to the structural form and load. With the developing of science, the span of cable-stayed bridge is longer and longer, and the structure is lighter and handy. But the construction will bear cold, heat and same typical dynamic mater, such as seismic response, wind induced vibration and other load in the period of construction. Thus, it attaches importance to choosing a professional construction control system, and the static calculation and dynamic calculation is the core of the construction control.In this thesis, on the basic of studying domestic and international methods of construction control, establish a professional construction control system of cable-stayed bridge. Expatiate the necessity for adopting 3-D space modal in analysis of cable-stayed bridge calculation on construction control state, and introduce the methods of dummy member and how to use node dummy load in different modals.Taking the example of Yunyang Changjiang River Bridge, establish a 3-D space modal, compute and analyze the variety regulation from deformation inner force, stress, and cable tension. Then the distinct between the solutions of the two models is discussed.Because temperature effects that arise in bridges always perplex us in static analysis, it is advisable to choose appropriate methods at different time. In this paper, the temperature effects on the longest cantilever primary beam are computed. In the same time, data from surveying and calculation are made comparison particularly, what verifies the reliability of this method.Three-dimensional dynamic modal is also set up after expatiating the dynamic characteristics of cable- stayed bridges, and the contents of analysis with finite element method. Calculate the dynamic characteristics of the bridge that under different construction case.analyze its vibration dispersion and response when some load affect, discuss its advantages and appropriate ways to optimize the dynamic characteristics. Moreover, these conclusions can be deduced to analyze the distinct of dynamic characteristics between bridges of different structural forms and members, of which may provide reference in bridges of the same structure.