Fabrication Error Propagation Properties of Key Components of Large-Span Cable-Stayed Bridges with Steel Box Girder

To clarify the fabrication errors' propagating properties in the construction control of a large-span cable-stayed bridge, the effect characteristics of the manufacture errors of key components during the whole construction procedure were investigated. An error propagation equation was developed based on geometrically nonlinear equilibrium equations. By taking Sutong bridge, a typical large-span cable-stayed, as research object, an in-depth discussion concerning the forming process, effect characteristics and propagation properties of manufacturing errors was carried out. The research results show that the theoretical method established is feasible and appropriate to analyze and expound the error effects accompanying whole-procedure construction control. There are significant differences among the fabrication error propagation properties of different types of components. With the increase of cantilever length, the error effect of the angle fabrication error between main girder segments is convergent, while the error effect of the length fabrication error is not, so scientific error control schemes are necessary for better control effect.