Experimental assessment of the cyclic behaviour of concrete-filled steel tubular beam-columns with octagonal sections

Junbo Chen, Tak Ming Chan, Ray Kai Leung Su, José Miguel Castro

Research output: Journal article publicationJournal articleAcademic researchpeer-review

5 Citations (Scopus)

Abstract

This paper presents an experimental investigation on concrete-filled steel tubular beam-columns with octagonal cross-sections (OCFST) under cyclic lateral loading with or without axial load. A total of nine specimens with different parameters, including the axial load level (n) ranging from 0 to 0.5 and concrete compressive cylinder strength (fc′) varying from 30 MPa to 90 MPa, were tested. The failure modes, ultimate strengths, displacement ductility, effective flexural stiffness and cumulative dissipated energy are presented. The results indicate that OCFST beam-columns exhibit a ductile plastic mode and excellent energy dissipation. With the increase of axial load level, the ductility and the energy dissipation capacity decreases, while the ultimate bending capacity firstly increases then drops. Concrete grades seem to have limited influence on the ultimate strength and energy dissipation capacity. The comparison results of the ultimate bending moments and effective flexural stiffness between predictions using EN 1994-1-1 and AISC 360-16 and test results reveal their applicability to the design of OCFST beam-columns.

Original languageEnglish
Pages (from-to)544-560
Number of pages17
JournalEngineering Structures
Volume180
DOIs
Publication statusPublished - 1 Feb 2019

Keywords

  • Beam-column
  • Concrete-filled steel tube
  • Cyclic behaviour
  • Octagonal section

ASJC Scopus subject areas

  • Civil and Structural Engineering

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