Study on the Influence of Bending-torsion Coupling Effect in Curved Steel Box Girder Incremental Launching Construction
The effect of bending and torsion coupling during the incremental launching construction of curved steel box girders has a significant influence on the mechanical properties of the structure.Tak-ing the incremental launching construction project of a curved continuous steel box girder bridge as the background,the finite element software was used to establish the incremental launching construction analysis model,and calculate the bending torsion coupling effect during incremental launching con-struction process of the curved steel box girder.In addition,the results were compared and analyzed with relevant measured data.The results show that the influence of bending-torsion coupling on stress and internal force is more obvious than that on structural deformation.The influence coefficient of pedestal bearing reaction force is more than 0.8 at the highest,and under the same conditions,the in-fluence of bending-torsion coupling on the front pedestal bearing reaction force is the largest.Moreo-ver,other factors will enhance the bending-torsion coupling in the low-stress area,while the influence on the high-stress area is small.
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