A Sanchaji Mechanical Properties Of Self-anchored Suspension Bridge With Steel Box Girder Welding Anchor Box Space

Based on the self-anchored suspension bridge in Changsha, and in allusion to the novelty of its anchorage box formation and unique connection by entire welding, the mechanics performance was investigated by the spatial finite element method. This paper has been done in following aspects:1. The finite element model without initial imperfections which is in accordance with the anchorage box of the Sanchaji Bridge is established by the finite element common software. Spatial stress and its distribution rule of each plate have been gotten, and the local stability of the web which bears worst load is especially confirmed.2. Welding-induced residual stresses and distortion in anchorage box are emphasized. Their conception and formation mechanism are also presented. Besides, this paper presents a finite element simulation technique for predicting welding-induced residual stresses. Moreover, such method is validated, and residual stresses induced by web and horizontal plate welding have been gained finally.3. Finite element model with welding-induced distortion and finite element model with welding-induced residual stresses and distortion are established. Elastic buckling analysis is done to the two models, such analysis is also done to the model without any initial imperfections. Each model's elastic buckling mode and critical load have been received. Influence of welding-induced imperfections to the elastic critical load of anchorage box has also been received by comparing the three models.4. This paper brings forward the essentiality to reduce welding-induced imperfections, and it sums up several methods to decrease them.