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Temperature Effect Analysis of Large Segment Factory Manufacturing Alignment of Steel Box Girder
Deng Fuqiang,Wang Jinfeng,Yang Songwei,Xu Linghua,Xu Rongqiao 한국강구조학회 2024 International Journal of Steel Structures Vol.24 No.1
The construction of the cross-sea steel box girder bridge is gradually advancing and integrating, which particularly refl ects in the size of the bridge. The length of a single installation segment often exceeds 100 m. The alignment of the steel box girder is signifi cantly aff ected by the temperature eff ect during manufacturing. This paper investigates the impact of temperature gradient on corresponding alignment at the manufacturing stage for the large-segment steel box girder taking a large-span continuous steel box girder bridge as a case study. The inspection of temperature during the assembly procedure was carried out. After obtaining the data during welding, the infl uence of the temperature was evaluated using a fi nite element model. The results show that with the temperature gradient measured, the defl ection of the second suspension of the mid-span reaches 10.9 mm and the defl ection of the cantilever end reaches 17.1 mm, respectively. The deformation conforms to the code specifi cations when considering the infl uence of the temperature gradient eff ect. The corresponding pre-camber value should be set for the large segments assembled outdoor. At the same time, welding operation should be carried out under the preset temperature diff erence to partially eliminate the impact of temperature gradient.