Axial load behavior of stiffened concrete-filled steel columns

Chiung-Shiann Huang*, Y. K. Yeh, G. Y. Liu, H. T. Hu, K. C. Tsai, Y. T. Weng, S. H. Wang, M. H. Wu

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

226 Scopus citations

Abstract

This study investigates the axial load behavior of concrete-filled steel tubular (CFT) columns with the width-to-thickness ratios between 40 and 150, and proposes an effective stiffening scheme to improve the mechanical properties of square cross-sectional CFT columns. Seventeen specimens were tested to examine the effects of cross-sectional shapes, width-to-thickness ratios, and stiffening arrangements on the ultimate strength, stiffness, and ductility of CFT columns. Moreover, nonlinear finite element analysis was also conducted to investigate cross-sectional axial stress distribution at the ultimate strength. Comparing the measured ultimate strength with estimates by using some current specifications suggested that current specifications may considerably underestimate the ultimate strength of circular CFT columns, particularly for columns with a small width-to-thickness ratio. Results in this study demonstrate that the proposed stiffening scheme can significantly enhance the ultimate strength and ductility of square CFT columns.

Original languageEnglish
Pages (from-to)1222-1230
Number of pages9
JournalJournal of Structural Engineering
Volume128
Issue number9
DOIs
StatePublished - 1 Jan 2002

Keywords

  • Axial loads
  • Finite element method
  • Steel columns
  • Stiffening
  • Tubes

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