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Steel and Composite Structures
  Volume 18, Number 6, June 2015 , pages 1451-1464

A study on the structural performance of new shape built-up square column under concentric axial load
Sun-Hee Kim, Kyong-Soo Yom and Sung-Mo Choi

    Recently, in recognition of their outstanding structural performance, the use of Concrete Filled Steel Tube (CFT) columns has been increased. New shape welded built-up square tube was developed by the authors for broader usability using thin steel plates which were bent to be L-shaped (Channel) and each unit members were welded to form square steel tube as an cost-efficient use of expensive steel. In addition, since the rib placed at the center of the tube width acts as an anchor; higher load capacity of buckling is achievable. In order to apply the new shape built-up square columns, the structural behavior and stress distribution with parameter width of thickness (b/t), with and without rib were predicted. The New shape welded built-up square tube effectively delayed the local buckling of the steel tube, which led to a greater strength and ductility than regular HSS.
Key Words
    built-up square column; composite effect; width of thickness; concentric axial load
(1) Sun-Hee Kim, Sung-Mo Choi:
Department of Architectural Engineering, University of Seoul, Cheonnong-dong 90, Dongdaemun-Gu, Seoul, 130-743, Republic of Korea;
(2) Kyong-Soo Yom:
Harmony Engineering, Guro-Gu Seoul 152-051, Republic of Korea.

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