Structural performance of concrete-filled cold-formed high-strength steel octagonal tubular stub columns

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Abstract

This paper presents a comprehensive experimental and numerical study on the structural performance of concrete-filled cold-formed high-strength steel octagonal tubular stub columns. Stub column specimens formed using high-strength steel and infilled concrete with grades C50 and C90, and with three different plate width-to-thickness ratios were tested. The ultimate loads, load-displacement responses and failure modes of the structures were observed and discussed. In addition to the experimental investigations, a finite element model validated using the stub column test results was developed. A series of parametric studies were subsequently conducted to obtain supplementary data for concrete-filled cold-formed high-strength steel octagonal tubular stub columns with a wide range of plate width-to-thickness ratios and different concrete compressive strengths. The applicability of existing design approaches in European and American standards and in literature provided for concrete-filled steel tubular structures with rectangular, circular or octagonal cross-sections were evaluated using the results obtained from the experimental and numerical study. The accuracy of design predictions for concrete-filled cold-formed high-strength steel octagonal tubular stub columns using different design approaches was discussed. A design approach that more accurately incorporates the strength contributions from steel tubes and concrete infill was also proposed for structural design.

Original languageEnglish
Article number112360
JournalEngineering Structures
Volume239
DOIs
Publication statusPublished - 15 Jul 2021

Keywords

  • Cold-formed
  • Concrete-filled steel tubes
  • High-strength steel
  • Numerical study
  • Octagonal cross-section
  • Structural design
  • Stub columns
  • Testing

ASJC Scopus subject areas

  • Civil and Structural Engineering

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