Epoxy bonded Steel Plate Method is a reinforcement method for repairing cracked and damaged RC slabs of bridge. In the method, a steel skin plate is adhered to the bottom surface of damaged concrete slab with epoxy resin.The aim of this paper is to examine the reliability of this method. Model slabs were tested under the repetition of truck wheel loading in both the states before and after repairs. From various observations on deflection-growth, cracking in concrete, and strain-increase in steel bar and skin plate, it is concluded that the method is fairly reliable even if the repair is done at the stage of so severe damage as to cause diagonal tension (shear) cracks in the concrete section of slab.
A design method based on the column approach is proposed for evaluating the ultimate strength of orthogonally stiffened wide plates with some heavy longitudinal stiffeners (stringers) in steel box girder bridges including the main box girders of cable stayed bridges. The method is verified by the elasto-plastic and large deflexion analysis (F. E. M.). It is shown that the dimensions of transverse stiffeners in orthogonally stiffened wide plates with small aspect ratio can be greatly reduced without significant variation of the ultimate strength either by increasing the size of the longitudinal stiffeners or by replacing some longitudinal stiffeners with stringers so proportioned that the elastic buckling strength remains constant. The required stiffness of the flange plate of the stringer to avoid lateral-torsional buckling is also investigated by the F. E. M.
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