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Seismic performance of stainless-steel built-up box columns subjected to constant axial loads and cyclic lateral deformations

Moghaddam, H ; Sharif University of Technology | 2021

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  1. Type of Document: Article
  2. DOI: 10.1016/j.istruc.2021.07.014
  3. Publisher: Elsevier Ltd , 2021
  4. Abstract:
  5. The seismic behavior of stainless-steel built-up box columns subjected to constant axial loads and cyclic lateral deformation that are used in special moment frames (SMFs) has been investigated through finite element (FE) analysis. A total of 208 numerical models were conducted to cover a range of parameters affecting the seismic behavior of the columns. These include the web slenderness ratio, flange slenderness ratio, global slenderness ratio, axial load level, and lateral loading protocol. The performance indices of overstrength factor, axial shortening, out-of-plane deformation, plastic hinge length, and rotation capacity were calculated and compared. Local buckling of the columns also was investigated and was shown to be responsible for a sharp rise in plastic strain and premature fracture. Predictive empirical formulas are proposed for calculating the plastic hinge length and axial shortening. All previous experimental data on built-up box columns composed of different types of steel materials were collected and added to the FE analysis results to form a reliable database. It was found that ASCE 41-17 conservatively calculated the plastic rotation angles of the built-up box columns. Furthermore, it was indicated that the highly ductile limits of AISC 341-16 for stainless-steel built-up box columns are satisfactory. © 2021 Institution of Structural Engineers
  6. Keywords:
  7. Built-up box ; AISC 341 ; ASCE 41 ; Performance indices ; Special moment frames ; Steel column ; Stainless steel
  8. Source: Structures ; Volume 33 , 2021 , Pages 4080-4095 ; 23520124 (ISSN)
  9. URL: https://www.sciencedirect.com/science/article/abs/pii/S2352012421006299