After a series of famous accidents of box girder bridges in the last decade, extensive and elaborate research programs have been under way at various institutions aiming at establishing more reasonable design code of box girders.
The proper choice and determination of the cross section, layout, and steel for the stiffeners are of great importance for the economical and safe design of stiffened plates.
The interest of the proposed study is specifically focused on the effect of the large torsional rigidity of ribs, which in general practice has been neglected, upon the load carrying capacity of stiffened plates.
The proposed study consists of the experimental work and the theoretical analysis. In the experiment, the longitudinal ribs were made of rectangular tubes, and seven test specimens were subjected to the axial compression by universal testing machine, of which one was an unstiffened plate, three with single longitudinal rib, and three with two longitudinal ribs. The theoretical analysis consists of buckling analyses using finite element method and the Simplified Element Method which one of the authors developed.
The result of the proposed study shows that the effect of the large torsional rigidity of the ribs is quite beneficial as far as the buckling load is concerned ; however, this effect upon the ultimate strength was found not so eminent.
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