Fourth Progress Report On The Column Tests At Lehigh University
Inge Lyse and C. L. Kreidler
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This is a-second report on Series 3 of the ACI column investigation and includes the results of columns main-tained 52 weeks under sustained loading and then loaded to failure. It was found that the rate of flow was greatest for the smallest and least for the lar centage of longitudinal reinforcement. The much per-lowwas when th rester when the columns were stored dry than ey were stored wet. The strength of the columnswhich had been subjected to working loads 52 weeks was essentially the same as the strength of their com- anion columns which had not been previously loaded. he ultimate strength of reinforced concrete columns may be considered equal to: (a) 75 percent of the cylinder strength of the concrete times the concrete area, (b) the total yield-point strength of the longitudinal reinforcement, and in case of spiral reinforce- ment, (c) the total yield-point strengt h of the spiral reinforcement times its effectiveness ratio.