Structure of Gusset Plate Part of Steel Box Girder for Bridge

摘要

The present invention relates to a gusset plate structure of a steel box girder for road bridges, which is constructed for cross beam connection on one side of the girder in order to connect the girder and the girder with a cross beam in a road bridge. The edge weld joint of the gusset plate is improved with a novel structure that can reduce stress concentration and improve fatigue stiffness.;The gusset plate structure of the steel box girder for road bridges according to the present invention, the upper flange 12, the lower flange 14, and the abdominal plate 16 is bonded to both left and right sides to form a box-shaped cross-section, the abdominal plate ( 16) In a steel bridge box girder, in which a gusset plate for connecting with an adjacent box girder and a cross member 4 is provided laterally, the gusset plate 30 is located on the side of the abdominal plate 16. Intermediate flange 28 is installed from the middle of the (16), the main plate 32 for connecting the cross member 4 is installed between the upper flange 12 and the intermediate flange 28, A support plate 34 is installed between the intermediate flange 28 and the lower flange 14, and the inclined flange 40 is attached to the end inclined surface 34a of the support plate 34, and the lower flange 14 is provided. ) And inclined flange 40 and intermediate flange The edge (34c) having a predetermined distance away from the end of each of the flanges (14, 28, 40) corresponding to the end edge of the support plate 34 at the portion where the inclined flange (40) meets (28) It is characterized in that the relief groove 34b recessed in a round shape from the 34c) is formed.;The present invention has a shape in which the corner portion of the gusset plate 30 is recessed inwardly by the relief groove 34b so that the vertical load of the traffic vehicle passing through the bridge can be easily distributed. By ensuring the welding distance with each flange 14, 28, and 40, the stress concentration phenomenon which arises in the edge part of a support plate is suppressed, and it has a structure strong against fatigue.