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Steel and Composite Structures
  Volume 34, Number 3, February10 2020 , pages 377-391

Numerical study on the axial compressive behavior of built-up CFT columns considering different welding lines
Mahdi Shariati, Morteza Naghipour, Ghazaleh Yousofizinsaz, Ali Toghroli and Nima Pahlavannejad Tabarestani

    A concrete filled steel tube (CFT) column with stiffeners has preferable behavior subjected to axial loading condition due to delay local buckling of the steel wall than traditional CFT columns without stiffeners. Welding lines in welded built-up steel box columns is expected to behave as longitudinal stiffeners. This study has presented a numerical investigation into the behavior of built-up concrete filled steel tube columns under axial pressure. At first stage, a finite element model (FE) has been built to simulate the behavior of built-up CFT columns. Comparing the results of FE and test has shown that numerical model passes the desired conditions and could accurately predict the axial performance of CFT column. Also, by the raise of steel tube thickness, the load bearing capacity of columns has been increased due to higher confinement effect. Also, the raise of concrete strength with greater cross section is led to a higher load bearing capacity compared to the steel tube thickness increment. In CFT columns with greater cross section, concrete strength has a higher influence on load bearing capacity which is noticeable in columns with more welding lines.
Key Words
     built-up CFT; welding lines; stiffeners; FEM; strength
Mahdi Shariati: 1Division of Computational Mathematics and Engineering, Institute for Computational Science,
Ton Duc Thang University, Ho Chi Minh City, Vietnam;
Faculty of Civil Engineering, Ton Duc Thang University, Ho Chi Minh City, Vietnam
Morteza Naghipour, Ghazaleh Yousofizinsaz and Nima Pahlavannejad Tabarestani: Department of Civil, Babol Noshirvani University of Technology, Babol, Iran
Ali Toghroli: Institute of Research and Development, Duy Tan University, Da Nang 550000, Viet Nam

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