千米级斜拉桥施工过程中主梁的线形控制

将最优化计算理论引入到斜拉桥主梁的悬臂拼装计算中 ,采用 1阶分析法来确定斜拉桥的合理施工状态 ,用空间非线性有限元模拟了钢箱梁的悬臂拼装过程 ,求出各施工阶段节段的预抛高值 ,为某千米级斜拉桥的施工控制提供依据 .还讨论了该桥的主梁横联刚度及其对纵向主梁的弯矩的影响 .

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.