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Steel and Composite Structures
  Volume 16, Number 6, June 2014 , pages 639-655

A study on bending strength of reinforced concrete filled steel tubular beam
Alifujiang Xiamuxi, Akira Hasegawa and Akenjiang Tuohuti

    The mechanical characteristic of reinforced concrete filled steel tubular (RCFT) structures are differed from that of concrete filled tubular steel (CFT) structures because the reinforcement in RCFT largely affects the performance of core concrete such as ductility, strength and toughness, and hence the performance of RCFT should be evaluated differently from CFT. To examine the effect axial reinforcement on bending performance, an investigation on RCFT beams with varying levels of axial reinforcement is performed by the means of numerical parametric study. According to the numerical simulation results with 13 different ratios of axial reinforcement, it is concluded that the reinforcement has obvious effect on bending capacity, and the neutral axis of RCFT is different from CFT, and an evaluation equation in which the effect of axial reinforcement is considered for ultimate bending strength of RCFT is proposed.
Key Words
    RCFT; axial reinforcement; numerical simulation; neutral axis; bending strength
(1) Alifujiang Xiamuxi, Akenjiang Tuohuti:
College of Architecture and Civil Engineering, Xinjiang University, Urumqi 830047, China;
(2) Akira Hasegawa:
Department of Environmental and Civil Engineering, Hachinohe Institute of Technology, Hachinohe, Japan.

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