To fully take into account the effect of geometric nonlinearity on the deformation of extra-long-span cable-stayed bridges, a cable-stayed bridge with a main span of 780m was analyzed on the basis of the girder initial erection profile and three calculation modes, i.e., linearity, partially geometric nonlinearity without including cable sag, fully geometric nonlinearity, and the cantilever construction. The result shows that the geometric nonlinearity enhances distinctly with the increasing of cable length and cantilever length and cable sag stands out more prominently due to the three geometric nonlinearity factor. After the main girder closure, the geometric nonlinearity which caused by cable sag becomes slight. The research shows that it ensures the erection profile and final bridge geometry to take geometric nonlinearity into account.
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