Temperature Influence to the Section Deformation of the Steel Box Girder of a Cable-stayed Bridge During Cantilever Erection

Flat hollow steel box girder with truss-type diaphragms and internal webs are adopted in Zhanjiang Bay Bridge.The section deformation of the box girder is obviously different between the girder segment to be hoisted and the cantilever system supporting the walking crane during the cantilever erecting due to different applied loads.3D finite element models for girder segments are developed.The section deformations of the box girder and the temperature influence are computed.Analysis results show that it is feasible to adopt the steel box girder with truss-type diaphragms and internal webs in long span cable-stayed bridges,and the temperature has little influence to the relative deformation of the box girder.