Engineering and Contracting . or a plain concrete column per 1 per centof reinforcement ranges from to 332 ENGINEERING-CONTRACTING Vol. XXIX. No. 23. for the columns witli spiral rein-forcement and to with bands. Attention shouldbe called to the fact that the columns rein-forced with spiral will sustain higherloads, as well as shorten more, than tliccolumns reinforced with bands. It is not and part lo the effect of the presence of thehooping upon the density of the the colurrtus reinforced with bandsthere is a fair agreement in the v
Engineering and Contracting . or a plain concrete column per 1 per centof reinforcement ranges from to 332 ENGINEERING-CONTRACTING Vol. XXIX. No. 23. for the columns witli spiral rein-forcement and to with bands. Attention shouldbe called to the fact that the columns rein-forced with spiral will sustain higherloads, as well as shorten more, than tliccolumns reinforced with bands. It is not and part lo the effect of the presence of thehooping upon the density of the the colurrtus reinforced with bandsthere is a fair agreement in the value ofthis additional strength per 1 per cent ofreinforcement for all the 12-in. columns rc-g;irdless of the amount of reinforcement. 1—Hi—3 concrete, and that the differencein the strength of these columns seems toshow up mainly through a difference in thestrength of the concrete itself. It shouldbe recalled, however, that the hooped col-umn with 1—4—8 concrete is much lessstiff through the second stage than is that. I m zz±7s^3: k«^ r§s htdt o-/2mffa/i^.hoope^ Columns o -/f/pff Corfioff jp/ra/- hooped Co/um/r4_/T//4 Jft*/ ^fffra/^oop^d Fig. OfFoenfiT/on P£p uniT of lcngthFig. 3—Stress Deformation Diagram for SpiralHooped Columns. known wdiether the concrete bulged outmore between the spirals than between thehoops, but this condition seems of Hooped Columns.—In Table IV are given the loads carried by the col-umns reinforced with bands, and in Table V those with spiral reinforcement. Fig. 4shows the results graphically. It is evident(hat hooping adds strength and that the ex-cess of strength over that of plain concretecolumns is proportional to the amount ofreinforcement. The full effect of the hoop-ing is not clearly shown in Fig. 4 since theconcrete in each column has its individualstrength. A better comparison is made byfirst estimating the strength of the con-crete for each column as found in of Elasticity and CompressiveDeforma
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