Connections of concrete slabs with edge columns
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AbstractSix full-scale reinforced concrete flat plate edge slab-column connections were constructed and loaded until failure. Shear and unbalanced moment were applied to the connections at a constant ratio to reflect conditions under gravity loading in a typical multi-storey structure. Analytical work was performed to insure that the connections correctly modelled the distribution of forces which occur, in the elastic region, in an actual structure. The main objective of this investigation was to check, experimentally, the design procedure for stud shear reinforcement suggested by Dilger and Ghali (1981) on reinforced concrete edge slab column connections. In addition several codes were studied and the shear capacities they predicted were compared to test values. Test variables included the flexural reinforcement ratio, the spacing of the shear studs, the placement of the shear studs in the spandrel strip, the size of the shear reinforced zone and the width of a plate to which the studs were welded. It was concluded that the North American codes were reasonably accurate when used to predict the shear capacity of specimens containing no shear reinforcement. A proposal has been included which might improve this accuracy further. In specimens containing shear studs, the symmetrical critical section suggested by the North American codes may be unsafe. The shear stud reinforcement produced impressive increases in both the strength and ductility of the connections in which they were used.
Bibliography: p. 174-175.