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Thi paper summarizes the r e ult of compre sive tests of steel colums having perforated cover plate . T ests have been made of perforated plate columns with perfm·ations of the following hapes : Circular, ovaloid with the load parallel to the long axis, ovaloid with the load parallel to the shor t axis, ellip tical with the load parallel to the major axis, "square" with the load parallel to two sides, and "square" with the load parallel to a diagonal. In this paper, the ovaloid perforations were those having the shape of a quare with a semicircle erected on two oppo ite sides; the "square" perforations were squares with rounded corner , the radius of the fillets b eing about 0.086 times the length of the side of th e quare. The expression "perforated plate" is used here for a plate having a series of similar perforations uniformly distributed along its length. Tests in the elastic range have been made on 88 columns with perforated plate and on 17 columns

Perforated cover plates for steel columns: Summary of compressive properties