Journal
JOURNAL OF CONSTRUCTIONAL STEEL RESEARCH
Volume 60, Issue 7, Pages 1049-1068Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.jcsr.2003.10.001
Keywords
composite; high strength; concrete; steel design; columns; confinement circular hollow sections; tubes
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The behaviour of circular concrete-filled steel tubes (CFT) with various concrete strengths under axial load is presented. The effects of steel tube thickness, the bond strength between the concrete and the steel tube, and the confinement of concrete are examined. Measured column strengths are compared with the values predicted by Eurocode 4, Australian Standards and American Codes. 15 specimens were tested with 30, 60 and 100 N/mm(2) concrete strength, with a D/t ratio from 22.9 to 30.5. All the columns were 114 mm in diameter and 300 mm in length. The effect due to concrete shrinkage is critical for high-strength concrete and negligible for normal strength concrete. All three codes predicted lower values than that measured during the experiments. Eurocode 4 gives the best estimation for both CFT with normal and high-strength concrete. (C) 2003 Elsevier Ltd. All rights reserved.
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