The Structural Engineer > Archive > Volume 75 (1997) > Issues > Issue 23/24 > Large-Scale Tests on Slender, Reinforced Concrete Columns
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Large-Scale Tests on Slender, Reinforced Concrete Columns

Large-scale tests were carried out on 26 slender; reinforced concrete columns with 1ength:depth ratio in the range 15-31.7; the compressive strengths of concrete ranged from 31 -96N/mm². The pin-ended columns were subjected to short-term eccentric axial loads with load-eccentricity:depth ratio of 0.25 and 0.5. All the columns were reinforced with four high-yield deformed bars having a nominal strength of 460N/mm² ith steel ratio varying from 1.34%-3.35%. The test results were compared with the values predicted using ACI318: 1995, BS 8110:1985, and EC2:1992. These tests, which for the first time enabled the provisions for slender columns in the Codes to be checked against experimental values, have indicated that the Codes are safe design documents for concrete strength as high US 96N/mm². Compared with those of BS 811O, the slender-column recommendutions of EC2 are more conservative, closer to those of ACI, and more complex to use. P.H. Chuang and Professor F.K. Kong