Rehabilitation and strengthening of high-strength rectangular CFST beams using a partial wrapping scheme of CFRP sheets: Experimental and numerical study

Ahmed W. Al Zand, Wan Hamidon Wan Badaruzzaman, Azrul A Mutalib, Salam J. Hilo

Research output: Contribution to journalArticle

11 Citations (Scopus)

Abstract

Recently, concrete-filled steel tubular (CFST) members are becoming highly recommended by engineers for use in composite structures. Lately, carbon fiber-reinforced polymer (CFRP) composite materials have been used for strengthening steel and CFST flexural members. Both experimental and numerical studies are adopted in this research to further investigate the behavior of various sections of rectangular CFST beams strengthened and/or repaired with unidirectional CFRP sheets. The effects of the U-shaped wrapping scheme using multiple CFRP layers applied at various beam lengths was studied. In general, the results demonstrated that the moment capacity of strengthened CFST beams increased significantly with increasing CFRP layers; for example, it increased by approximately 40% and 55% for beams with compact and slender sections, respectively, when wrapped with 4 CFRP layers. The capacity of damaged CFST beams has improved over 65% when repaired with 2 CFRP layers. Moreover, the effects of wrapping the beam along 75% of its length achieved a similar enhancement ratio and behavior as that of the beam with wrapping along 100% of its length for the same CFRP layers.

Original languageEnglish
Pages (from-to)80-91
Number of pages12
JournalThin-Walled Structures
Volume114
DOIs
Publication statusPublished - 1 May 2017

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Strengthening (metal)
Patient rehabilitation
Carbon fibers
Concretes
Steel
Polymers
Composite structures
Engineers
Composite materials

Keywords

  • CFRP sheet
  • CFST beam
  • Fatigue
  • Finite element analysis (FEA)
  • Partial strengthening

ASJC Scopus subject areas

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

Cite this

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title = "Rehabilitation and strengthening of high-strength rectangular CFST beams using a partial wrapping scheme of CFRP sheets: Experimental and numerical study",
abstract = "Recently, concrete-filled steel tubular (CFST) members are becoming highly recommended by engineers for use in composite structures. Lately, carbon fiber-reinforced polymer (CFRP) composite materials have been used for strengthening steel and CFST flexural members. Both experimental and numerical studies are adopted in this research to further investigate the behavior of various sections of rectangular CFST beams strengthened and/or repaired with unidirectional CFRP sheets. The effects of the U-shaped wrapping scheme using multiple CFRP layers applied at various beam lengths was studied. In general, the results demonstrated that the moment capacity of strengthened CFST beams increased significantly with increasing CFRP layers; for example, it increased by approximately 40{\%} and 55{\%} for beams with compact and slender sections, respectively, when wrapped with 4 CFRP layers. The capacity of damaged CFST beams has improved over 65{\%} when repaired with 2 CFRP layers. Moreover, the effects of wrapping the beam along 75{\%} of its length achieved a similar enhancement ratio and behavior as that of the beam with wrapping along 100{\%} of its length for the same CFRP layers.",
keywords = "CFRP sheet, CFST beam, Fatigue, Finite element analysis (FEA), Partial strengthening",
author = "{Al Zand}, {Ahmed W.} and {Wan Badaruzzaman}, {Wan Hamidon} and {A Mutalib}, Azrul and Hilo, {Salam J.}",
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T1 - Rehabilitation and strengthening of high-strength rectangular CFST beams using a partial wrapping scheme of CFRP sheets

T2 - Experimental and numerical study

AU - Al Zand, Ahmed W.

AU - Wan Badaruzzaman, Wan Hamidon

AU - A Mutalib, Azrul

AU - Hilo, Salam J.

PY - 2017/5/1

Y1 - 2017/5/1

N2 - Recently, concrete-filled steel tubular (CFST) members are becoming highly recommended by engineers for use in composite structures. Lately, carbon fiber-reinforced polymer (CFRP) composite materials have been used for strengthening steel and CFST flexural members. Both experimental and numerical studies are adopted in this research to further investigate the behavior of various sections of rectangular CFST beams strengthened and/or repaired with unidirectional CFRP sheets. The effects of the U-shaped wrapping scheme using multiple CFRP layers applied at various beam lengths was studied. In general, the results demonstrated that the moment capacity of strengthened CFST beams increased significantly with increasing CFRP layers; for example, it increased by approximately 40% and 55% for beams with compact and slender sections, respectively, when wrapped with 4 CFRP layers. The capacity of damaged CFST beams has improved over 65% when repaired with 2 CFRP layers. Moreover, the effects of wrapping the beam along 75% of its length achieved a similar enhancement ratio and behavior as that of the beam with wrapping along 100% of its length for the same CFRP layers.

AB - Recently, concrete-filled steel tubular (CFST) members are becoming highly recommended by engineers for use in composite structures. Lately, carbon fiber-reinforced polymer (CFRP) composite materials have been used for strengthening steel and CFST flexural members. Both experimental and numerical studies are adopted in this research to further investigate the behavior of various sections of rectangular CFST beams strengthened and/or repaired with unidirectional CFRP sheets. The effects of the U-shaped wrapping scheme using multiple CFRP layers applied at various beam lengths was studied. In general, the results demonstrated that the moment capacity of strengthened CFST beams increased significantly with increasing CFRP layers; for example, it increased by approximately 40% and 55% for beams with compact and slender sections, respectively, when wrapped with 4 CFRP layers. The capacity of damaged CFST beams has improved over 65% when repaired with 2 CFRP layers. Moreover, the effects of wrapping the beam along 75% of its length achieved a similar enhancement ratio and behavior as that of the beam with wrapping along 100% of its length for the same CFRP layers.

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KW - Fatigue

KW - Finite element analysis (FEA)

KW - Partial strengthening

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