Effect of Geometric Nonlinearity on Deformation of Extra-Long-Span Cable-Stayed Bridge

To fully take the effect of geometric nonlinearity on the deformation of extra-long-span cable-stayed bridges into account, the effect of geometric nonlinearity on the deformation of a cable-stayed bridge with a main span of 1 088 m, as an example, was analyzed on the basis of the girder initial fabrication profile and three calculation modes, i.e., linearity, partially geometric nonlinearity without considering the sag of stay-cables and fully geometric nonlinearity, and the effects during the cantilever construction and after bridge closing were investigated.The research results show that the geometric nonlinear effect enhances distinctly with the increases of cable length and cantilever length and the sag effect of stay-cables stands out more prominently in the three geometric nonlinearity factors.