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Steel and Composite Structures
  Volume 31, Number 3, May10 2019, pages 291-301

Mechanical behaviors of concrete-filled rectangular steel tubular under pure torsion
Fa-xing Ding, Shi-jing Sheng, Yu-jie Yu and Zhi-wu Yu

    Pure torsion loading conditions were not frequently occurred in practical engineering, but the torsional researches were important since it's the basis of mechanical property researches under complex loading. Then a 3D finite element model with precise material constitutive models was established, and the effectiveness was verified with test data. Parametric studies with varying factors as steel yield strength, concrete strength and sectional height-width ratio, were performed. Internal stress state and the interaction effect between encased steel tube and the core concrete were analyzed. Results indicated that due to the confinement effect between steel tube and core concrete, the torsional strength of CFT columns was greatly improved comparing to plain concrete columns. The steel ratio would greatly influence the torque share between the steel tube and the core concrete. Then the torsional strength calculation formulas for core concrete and the whole CFT column were proposed. The proposed formula could be simpler and easier to use with guaranteed accuracy. Related design codes were more conservative than the proposed formula, but the proposed formula presented more satisfactory agreement with experimental results.
Key Words
    concrete-filled steel tube (CFT); pure torsion; finite element analysis; torsional bearing capacity; section shearing stiffness
(1) Fa-xing Ding, Shi-jing Sheng, Yu-jie Yu, Zhi-wu Yu:
School of Civil Engineering, Central South University, Changsha 410075, P.R. China;
(2) Fa-xing Ding:
Engineering Technology Research Center for Prefabricated Construction
Industrialization of Hunan Province, Changsha 410075, P.R. China.

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