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Steel and Composite Structures
  Volume 23, Number 6, April30 2017 , pages 669-682

Analysis of circular steel tube confined UHPC stub columns
An Le Hoang and Ekkehard Fehling

    The use of ultra high performance concrete (UHPC) in composite columns offers numerous structural benefits, and has received recent research attention. However, the information regarding the behavior of steel tube confined concrete (STCC) columns employing UHPC has been extremely limited. Thus, this paper presents an overview of previous experimental studies on circular STCC columns with taking into account various concrete strengths to point out their distinctive features. The effect of the confinement factor and the diameter to thickness ratio on both strength and ductility in circular STCC columns employing UHPC was investigated. The applicability of current design codes such as EC4, AISC, AIJ and some available analytical models for concrete confined by steel tube was also validated by the comparison of ultimate loads between the prediction and the test results of Schneider (2006) and Xiong (2012). To predict the stress-strain curves for confined UHPC in circular STCC stub columns, a simplified model was proposed and verified by the comparison with experimental stress-strain curves.
Key Words
    UHPC; STCC columns; confinement factor; strength; ductility; concrete filled steel tube
Faculty of Civil and Environmental Engineering, Institute of Structural Engineering, University of Kassel, Kurt-Wolters-Straße 3, 34125, Kassel, Germany.

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