Research Information System
Structures, vol.25, pp.35-46, 2020 (SCI-Expanded)
This study presents an experimental and numerical investigation on sandwich type cold formed tubular braces, which include awhich has load bearing member, inner buckling controller, outer buckling controller and end stiffeners. A total of 4 tubular brace specimens, using square HSS sections as a buckling controller and load bearing member, werewas tested under quasi-static cyclic loading. As suggested by previous research,, including a conventional tubular brace and tube in tube systems previously suggested by some researcherswas also used. All details related to the specimens, including equations used for the design, are presented in full. The specimens is presented in detail along with the related equations used to design. The performance of the specimens wereas experimentally tested under quasi static cyclic loading and . Also, strain distribution patterns were numerically evaluated. Combined, as well as and individual effects, of the outer buckling controller, inner buckling controller and end stiffeners on the load bearing member were also carefully examined. The sSandwich type tubular brace system showed symmetric and stable cyclic behavior until a 3 % drift ratio along with no and did not showed global buckling throughout the cyclic loadings. MMoreover, multiple minor buckling spread along the load bearing member. This desired damage condition was first reported for buckling controlled tubular braces in this study. Energy dissipation capacity increased almost 6 times according to the conventional tubular brace specimen. Unlike results from previous studies as evidenced in the the other studies in the literature, the usage only outer buckling controller and end stiffeners provided global buckling control only. This type of design, therefore, was did not effective to control local buckling and did not provided significant energy dissipation when compared with the conventional tubular braces.