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Analysis of Effect of Local Structure on Fatigue Performance of Critical Welding Seams of Steel Box Girder
Pages: 43-49
Year: Issue:  2
Journal: Bridge Construction

Keyword:  steel box girderlocal structurewelding seamfatigue stressorthotropic steel bridge decklongitudinal stiffening trussfinite element method;
Abstract: To provide basis for the fatigue design of the steel box girder under the action of vehicle load,the effect of the local structure of the girder on the fatigue performance of the critical welding seams of the girder was studied.The finite element method was used to calculate the stress curves of the welding seams of the girder under the single wheel moving load and on the basis of the calculation,the effect of the longitudinal stiffening truss arranged in the girder on the stress ranges and fatigue damages of the critical welding seams was analyzed.The results of the calculation and analysis show that the longitudinal stiffening truss increases the vertical stiffness of the top plate of the girder in the adjacent area of the truss and also changes the force conditions of the welding seam details nearby,which makes the fatigue stress and fatigue damages of the welding seams nearby far less than those of the welding seams in the same position without the stiffening truss.The effect of the differences of the local structure on the fatigue performance of the critical welding seams in the girder deck is significant and in the fatigue design of the girder, the effect should be appropriately taken into account.
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