Conceptual Design And Structural Analysis Of 1200m Cable-Stayed Bridge With Steel Box Girder

Based on the Humen Second Bridge in Guangzhou, the static and dynamic behavior performance of the design of a 1200 meters cable-stayed bridge with dual cable planes are studied. The analysis about the design is proposed, which is made according to the hydrological and geological condition of Nizhou Channel, to verify the feasibility of the design. The finite element model involving beam elements of the entire bridge is developed by large FEM program MIDAS/CIVIL2006.Firstly, the review of the development and structural characters of the cable-stayed bridge at home and abroad is briefly introduced, the project background and the modeling simulation of the bridge analysis is also presented. Then the stresses and deformations in different construction and operation stages are analyzed, and during operation stage the load actions are combined with dead load, live load, temperature variations and wind loads. At the same time the author calculates the free vibration periods and modes using the subspace iteration method, and analyzes the earthquake response with the method of spectrum and time history analysis. Finally, the solid model of the entire bridge is built with the general fem programm ALGOR, and the finite static calculation of the entire bridge with the consideration of constrution stages is executed, as well the force of the main components, including the top or button of the steel box girder and diaphragm, is also analyzed in detail.Therefore, the static and dynamic characteristics of the large span cable-stay bridge with dual cable planes are well understood and the analysis method of similar bridges is also mastered by the author.