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Te t ,,'ere made to determine the mechanical properties of perforated co ,'er plates intended to be used as a subs titute for la ttice bars or batten plates in built-up box-type colunU1 S, These t es ts supplement and extend the range of perforation shapes beyond that described in preceding reports, Thi paper gives the results for seven plates having perforations of ovaloid shape, s ix with the long axis parallel to the load, and one with the short axis parallel to the load; three plates having ellipt ical perforation s with the major axis paraliel to the load; two plates having square perforations with round ed corners for one of which thc load was paralJel to t he side of the square, and for th e other of which the load was parallel to a diagonal. A column having a solid plate ,,'as also te ted for comparison with the columns having perforated plates, Tests \I'ere mad e to determine the sti ffness of the perforated platc columns relative to that of t he column having a solid plate, t he dist ribu tion of st ress on t he edge of the perforation, and the st rength of each column .

Perforated cover plates for steel columns; compressive properties of plates having ovaloid, elliptical, and 'square' perforations