Study on Linear Control of Girders in Construction State for a Thousand-meter Scale Cable-stayed Bridge

This paper introduces the optimization theory and method for the calculation of cantilever construction of girders. The first order optimization method is used to determine the rational construction state of a cable-stayed bridge.Using spatial nonlinear finite element method(FEM),the actual cantilever construction process of steel box-shaped girders is simulated,and the prearranged height of girders during construction is obtained. The results provide the basis for the construction control of a thousand-meter scale cable-stayed bridge.At the same time,the influence of the bending rigidity between transverse beams on the bending moment of lengthways girders in the finished dead state is discussed.