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Steel and Composite Structures
  Volume 44, Number 3, August10 2022 , pages 339-351

Tensile capacity of mortar-filled rectangular tube with various connection details
Chul-Goo Kim, Su-Min Kang, Tae-Sung Eom and Jang-Woon Baek

    A mortar-filled rectangular hollow structural section (RHS) can increase a structural section property as well as a compressive buckling capacity of a RHS member. In this study, the tensile performance of newly developed mortar-filled RHS members was experimentally evaluated with various connection details. The major test parameters were the type of end connections, the thickness of cap plates and shear plates, the use of stud bolts, and penetrating bars. The test results showed that the welded T-end connection experienced a brittle weld fracture at the welded connection, whereas the tensile performance of the T-end connection was improved by additional stud bolts inserted into the mortar within the RHS tube. For the end connection using shear plates and penetrating stud bolts, ductile behavior of the RHS tube was achieved after yielding. The penetrating bars increased load carrying capacity of the RHS. Based on the analysis of the load transfer mechanism, the current design code and test results were compared to evaluate the tensile capacity of the RHS tube according to the connection details. Design considerations for the connections of the mortar-filled RHS tubes were also recommended.
Key Words
    end-plate connection; mortar-filled tube (MFT); penetrating rebar; rectangular hollow section (RHS); shear end plate; spatial structures; steel truss; stud bolt connection; tensile test; welded T-end connection
Chul-Goo Kim:Department of Architectural and Urban Systems Engineering, Ewha Womans University, Seoul, 03760, Republic of Korea

Su-Min Kang:School of Architecture, Soongsil University, Seoul, 06978, Republic of Korea

Tae-Sung Eom:Department of Architectural Engineering, Dankook University, Gyeonggi, 16891, Republic of Korea

Jang-Woon Baek:Department of Architectural Engineering, Kyung Hee University, Gyeonggi, 17104, Republic of Korea

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