. Tests of eighteen concrete columns reinforced with cast •uj -bg >aci q-j ss^a+5 20 Technologic Papers of the Bureau of Standards. pawned f oyoi ivioi Reinforced Concrete Columns . 21 V. DETAILED DESCRIPTION OF COLUMNS OF THE SAME LENGTH AND VARIOUS CROSS SECTIONS (a) Columns 8 Feet Long.—For convenience of reference, Fig. 1and Table 2 give the details of construction and the results ofthe tests of the four 8-foot columns In Fig. 16B is given thestress strain and load strain for this set of columns. Column 3 was probably defective in some manner, as can beseen by the relati
. Tests of eighteen concrete columns reinforced with cast •uj -bg >aci q-j ss^a+5 20 Technologic Papers of the Bureau of Standards. pawned f oyoi ivioi Reinforced Concrete Columns . 21 V. DETAILED DESCRIPTION OF COLUMNS OF THE SAME LENGTH AND VARIOUS CROSS SECTIONS (a) Columns 8 Feet Long.—For convenience of reference, Fig. 1and Table 2 give the details of construction and the results ofthe tests of the four 8-foot columns In Fig. 16B is given thestress strain and load strain for this set of columns. Column 3 was probably defective in some manner, as can beseen by the relatively weak stress-strain curve. The initial stiffness of this group of columns for points previousto failure, with the exception of column 3, is proportional, or atleast in the same order as the values of E calculated from theformula on page 31. From these four columns it appears that variation of amountof concrete within the spiral and outside the cast-iron reinforce-ment has no appreciable effect. The concrete within the cast-iron core appears to increase the strength of the column 6500pounds for each square inch of this concrete fi
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