Analysis Of The Long-Span P.C. Cable-Stayed Bridge's Behavior In The Construction Process

This thesis focuses on geometric nonlinear static analysis of long-span cable-stayed bridges. The basic theories of geometric nonlinear analysis about long span cable-stayed bridge are introduced. Then three principle factors that affect geometric nonlinearity of cable-stayed bridges are described, which are large displacement, effect of cable sag and combined effects of moment and axial force; then the finite element methods are introduced separately. And then, the finite element model of Chongqing Changshou Yangtze River Highway Bridge according to its scheme with single pylon is erected by MIDAS/Civil, a general finite element software. In this thesis presents the methods to simulate the real load-bearing condition of bridge structure, effects of cable sag and erecting and removing of element under construction stages. At last, the linear and nonlinear analysis of construction stages is made. According to the comparison between those results, conclusions aredrew.In this paper, the Rational Cable Force of Chongqing Changshou Yangtze River Highway Bridge were claimed on the basis of the control method about the construction of the cable-stayed bridge. At the same time, we pay more attention on the analysis of the main characteristics and the structure balance of the former stronghold cradle. And raise the method of the middle Cable Force of Cable-stayed Bridge. In the end, we give out the right middle Cable Force of Chongqing Changshou Yangtze River Highway Bridge base on the method we just introduce.