ON AN APPROXIMATE ANALYSIS OF SIMPLY SUPPORTED BOX GIRDER BRIDGE

抄録

As a means of the beam bridge design, hitherto, has been adopted two-dimensional calculation method ; hence, main beams, floor systems and floor slabs were calculated separately. With the recent progress and development of steel highway bridge constructions and the generalization of stress measurings, it is insufficient to treat in customary means the beam bridge design, and the necessity of three-dimensional consideration has been recognized. Inasmuch as main beams of box girder bridges have especially considerable width, it is evidently inadequate to treat them as an assemblage of rods. Accordingly, in this paper, the deformation and stress of a simply supported box girder bridge with steel plate floor were three dimensionally analyzed and its approximate solution was proposed, the reliability of which was confirmed by model experiment. Further the cooperation of the floor slab in the load distribution was considered.