Comparative Analysis of the Tensioning Schemes of the Prestressed Concrete Wide Box Girder of Guanyinsi Changjiang River Bridge

For the prestressed concrete side main beam of Guanyinsi Changjiang River Bridge, the finite element model (FEM) of the standard girder segment is established based on Midas FEA, a nonlinear finite element analysis software of civil structure. In this paper, two kinds of transverse tendons tensioning schemes are developed, and the forces of the segment under different schemes are compared. The results show that the tensioning sequence of transverse tendons directly affects the spatial distribution of stress and deformation of the segment in various construction stages. When the tendons of the top plate are first tensioned, the deformation of the segment used as the end formwork is small, which meets the precision requirement of the short-line method. In addition, to improve the safety of construction, it is necessary to tension longitudinal tendons to reduce the stress of the bottom plate.