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  Volume 1, Number 4, October 2016, pages 297-313

Flexural strength of circular concrete-filled tubes
Minsun Lee and Thomas H.-K. Kang

    The flexural strength of circular concrete-filled tubes (CCFT) can be estimated by several codes such as ACI, AISC, and Eurocode 4. In AISC and Eurocode, two methods are recommended, which are the strain compatibility method (SCM) and the plastic stress distribution method (PSDM). The SCM of AISC is almost the same as the SCM of the ACI method, while the SCM of Eurocode is similar to the ACI method. Only the assumption of the compressive stress of concrete is different. The PSDM of Eurocode approach is also similar to the PSDM of AISC, but they have different definitions of material strength. The PSDM of AISC is relatively easier to use, because AISC provides closed-form equations for calculating the flexural strength. However, due to the complexity of calculation of circular shapes, it is quite difficult to determine the flexural strength of CCFT following other methods. Furthermore, all these methods give different estimations. In this study, an effort is made to review and compare the codes to identify their differences. The study also develops a computing program for the flexural strength of circular concrete filled tubes under pure bending that is in accordance with the codes. Finally, the developed computing algorithm, which is programmed in MATLAB, is used to generate design aid graphs for various steel grades and a variety of strengths of steel and concrete. These design aid graphs for CCFT beams can be used as a preliminary design tool.
Key Words
    flexural strength; circular concrete-filled tube; computing algorithm; design aid graph
Minsun Lee and Thomas H.-K. Kang: Department of Architecture and Architectural Engineering, Seoul National University,1 Gwanak-ro, Gwanak-gu, Seoul 08826, Korea

Thomas H.-K. Kang: Department of Civil and Environmental Engineering, University of Illinois at Urbana-Champaign,
205 North Mathews Ave., Urbana 61810, USA

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