Finite element analysis of square CFST beam strengthened by CFRP composite material

Ahmed W. Al Zand, Wan Hamidon Wan Badaruzzaman, Azrul A Mutalib, A. H. Qahtan

Research output: Contribution to journalArticle

21 Citations (Scopus)

Abstract

Concrete-filled steel tubes (CFSTs) have become the most recommended composite structural members in many modern structures. These members may need upgrading or strengthening like any conventional structural members for many reasons. In this research, Finite element (FE) models are prepared to investigate the behavior of square CFST beams, partially strengthened with carbon fiber-reinforced polymer (CFRP) sheets. The proposed FE models are verified with existing experimental test results. Several parameters are studied in this research, including various CFRP wrapping lengths/layers, steel tube yielding strengths, depth-to-thickness (D/t), and length-to-depth (L/D) ratios. The application of CFRP to strengthen the CFST models found less improvement in the elastic range compared with the significant improvement in the plastic range. The CFRP is found to be not very effective if applied along 50% of models length compared with those applied along 75% or more of their length because of the delamination failure. Load improvement ratios achieved close values when strengthening the models along 75% and 100% of their length with CFRP sheets up to three layers. Better load improvement ratios were observed for the strengthened models with higher L/D and D/t ratios and for the models with lower steel yield strength when adopting the same strengthening scenario.

Original languageEnglish
Pages (from-to)348-358
Number of pages11
JournalThin-Walled Structures
Volume96
DOIs
Publication statusPublished - 3 Nov 2015

Fingerprint

Carbon fibers
Concretes
Finite element method
Steel
Composite materials
Polymers
Structural members
Delamination
Yield stress
Plastics

Keywords

  • CFRP
  • CFST beam
  • Composite beam
  • Finite element analysis
  • Strengthening

ASJC Scopus subject areas

  • Mechanical Engineering
  • Building and Construction
  • Civil and Structural Engineering

Cite this

Finite element analysis of square CFST beam strengthened by CFRP composite material. / Al Zand, Ahmed W.; Wan Badaruzzaman, Wan Hamidon; A Mutalib, Azrul; Qahtan, A. H.

In: Thin-Walled Structures, Vol. 96, 03.11.2015, p. 348-358.

Research output: Contribution to journalArticle

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