Tests on plain and reinforced concrete beams . ith cor-rugations to prevent slipping rolled on its four sides. It ishigh carbon steel breaking suddenly in the cold bend testwhen bent about 90 degrees. The coefficient of elasticity isabout 50,000,000 and its elastic limit 60,000 lbs., per squareinch. The bar was used in two sizes nominally l/2 and 0/4inches, tlie actual average areas of these including the cor-rugations being .2 and .365 square inches respectively, -le cor-rugations .in bars need alternated inste;.d of being continuous a s shown in figure. The Kahn bar is of entirely different
Tests on plain and reinforced concrete beams . ith cor-rugations to prevent slipping rolled on its four sides. It ishigh carbon steel breaking suddenly in the cold bend testwhen bent about 90 degrees. The coefficient of elasticity isabout 50,000,000 and its elastic limit 60,000 lbs., per squareinch. The bar was used in two sizes nominally l/2 and 0/4inches, tlie actual average areas of these including the cor-rugations being .2 and .365 square inches respectively, -le cor-rugations .in bars need alternated inste;.d of being continuous a s shown in figure. The Kahn bar is of entirely different form as is shown be-low. It is designed especially to resist the diagonal tensilestresses developed in connection with the shearing this purpose the sides are sheared at intervals and bentup at an angle of 45 degrees. The tv/o sizes used were nomi-nally 1/2 and 3/4 inches; the actual areas are and inches On the 1/2 inch size the sheareddiagonals are 6 inches long and on the 3/4 inch size 12 9. The iJteel is ratrier soft, the yield point beinp; at 35,000ll3S. , per sq. in. or less. It does not break readily in thecold bend test.
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Keywords: ., bookcentury1900, bookdecade1900, booksubjecttheses, bookyear1904
