Abstract
For the purpose of researching the strength and the rigidity etc. of box type girders used for overhead travelling cranes, full-sized model experiments were conducted. Two model girders were used. The top deck and two web plates of one model (girder 2) were reinforced by longitudinal stiffners, while those of the other (girder 1) were not. Load was applied on the top of the inner web plate at the center of the span of the each girder, which was supported at its ends. Results are as follows : (1) The stress distributions on the plate surfaces were generally irregular, while deflections, buckling loads, failure loads of girders and shapes of plates after failures were coincident with their calculated values. (2) The effects of longitudinal stiffners on the strength of girder 2 appeared clearly. (3) The torsion produced by the eccentric load had not remarkably bad effect upon the box type girders used for the present experiment.
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