Fatigue strength of steel girders strengthened with carbon fiber reinforced polymer patch

M. Tavakkolizadeh, Hamid - Saadatmanesh

Research output: Contribution to journalArticle

221 Citations (Scopus)

Abstract

Fatigue sensitive details in aging steel girders is one of the common problems that structural engineers are facing today. The design characteristics of steel members can be enhanced significantly by epoxy bonding carbon fiber reinforced polymers (CFRP) laminates to the critically stressed tension areas. This paper presents the results of a study on the retrofitting of notched steel beams with CFRP patches for medium cycle fatigue loading (R = 0.1). A total of 21 specimens made of S127×4.5 A36 steel beams were prepared and tested. Unretrofitted beams were also tested as control specimens. The steel beams were tested under four point bending with the loading rate of between 5 and 10 Hz. Different constant stress ranges between 69 and 379 MPa were considered. The length and thickness of the patch were kept the same for all the retrofitted specimens. In addition to the number of cycles to failure, changes in the stiffness and crack initiation and growth were monitored during each experiment. The results showed that the CFRP patch not only tends to extend the fatigue life of a detail more than three times, but also decreases the crack growth rate significantly.

Original languageEnglish (US)
Pages (from-to)186-196
Number of pages11
JournalJournal of Structural Engineering (United States)
Volume129
Issue number2
DOIs
StatePublished - Feb 2003

Fingerprint

Beams and girders
Steel
Carbon fibers
Polymers
Fatigue of materials
Crack propagation
Retrofitting
Crack initiation
Laminates
Aging of materials
Stiffness
carbon fiber
Fatigue strength
Engineers
Experiments

Keywords

  • Crack propagation
  • Fatigue
  • Fiber reinforced polymers
  • Flexure
  • Girders
  • Retrofitting
  • Steel

ASJC Scopus subject areas

  • Building and Construction
  • Civil and Structural Engineering

Cite this

Fatigue strength of steel girders strengthened with carbon fiber reinforced polymer patch. / Tavakkolizadeh, M.; Saadatmanesh, Hamid -.

In: Journal of Structural Engineering (United States), Vol. 129, No. 2, 02.2003, p. 186-196.

Research output: Contribution to journalArticle

@article{37ebacd4226e42b8bc47eefd0349d9e8,
title = "Fatigue strength of steel girders strengthened with carbon fiber reinforced polymer patch",
abstract = "Fatigue sensitive details in aging steel girders is one of the common problems that structural engineers are facing today. The design characteristics of steel members can be enhanced significantly by epoxy bonding carbon fiber reinforced polymers (CFRP) laminates to the critically stressed tension areas. This paper presents the results of a study on the retrofitting of notched steel beams with CFRP patches for medium cycle fatigue loading (R = 0.1). A total of 21 specimens made of S127×4.5 A36 steel beams were prepared and tested. Unretrofitted beams were also tested as control specimens. The steel beams were tested under four point bending with the loading rate of between 5 and 10 Hz. Different constant stress ranges between 69 and 379 MPa were considered. The length and thickness of the patch were kept the same for all the retrofitted specimens. In addition to the number of cycles to failure, changes in the stiffness and crack initiation and growth were monitored during each experiment. The results showed that the CFRP patch not only tends to extend the fatigue life of a detail more than three times, but also decreases the crack growth rate significantly.",
keywords = "Crack propagation, Fatigue, Fiber reinforced polymers, Flexure, Girders, Retrofitting, Steel",
author = "M. Tavakkolizadeh and Saadatmanesh, {Hamid -}",
year = "2003",
month = "2",
doi = "10.1061/(ASCE)0733-9445(2003)129:2(186)",
language = "English (US)",
volume = "129",
pages = "186--196",
journal = "Journal of Structural Engineering",
issn = "0733-9445",
publisher = "American Society of Civil Engineers (ASCE)",
number = "2",

}

TY - JOUR

T1 - Fatigue strength of steel girders strengthened with carbon fiber reinforced polymer patch

AU - Tavakkolizadeh, M.

AU - Saadatmanesh, Hamid -

PY - 2003/2

Y1 - 2003/2

N2 - Fatigue sensitive details in aging steel girders is one of the common problems that structural engineers are facing today. The design characteristics of steel members can be enhanced significantly by epoxy bonding carbon fiber reinforced polymers (CFRP) laminates to the critically stressed tension areas. This paper presents the results of a study on the retrofitting of notched steel beams with CFRP patches for medium cycle fatigue loading (R = 0.1). A total of 21 specimens made of S127×4.5 A36 steel beams were prepared and tested. Unretrofitted beams were also tested as control specimens. The steel beams were tested under four point bending with the loading rate of between 5 and 10 Hz. Different constant stress ranges between 69 and 379 MPa were considered. The length and thickness of the patch were kept the same for all the retrofitted specimens. In addition to the number of cycles to failure, changes in the stiffness and crack initiation and growth were monitored during each experiment. The results showed that the CFRP patch not only tends to extend the fatigue life of a detail more than three times, but also decreases the crack growth rate significantly.

AB - Fatigue sensitive details in aging steel girders is one of the common problems that structural engineers are facing today. The design characteristics of steel members can be enhanced significantly by epoxy bonding carbon fiber reinforced polymers (CFRP) laminates to the critically stressed tension areas. This paper presents the results of a study on the retrofitting of notched steel beams with CFRP patches for medium cycle fatigue loading (R = 0.1). A total of 21 specimens made of S127×4.5 A36 steel beams were prepared and tested. Unretrofitted beams were also tested as control specimens. The steel beams were tested under four point bending with the loading rate of between 5 and 10 Hz. Different constant stress ranges between 69 and 379 MPa were considered. The length and thickness of the patch were kept the same for all the retrofitted specimens. In addition to the number of cycles to failure, changes in the stiffness and crack initiation and growth were monitored during each experiment. The results showed that the CFRP patch not only tends to extend the fatigue life of a detail more than three times, but also decreases the crack growth rate significantly.

KW - Crack propagation

KW - Fatigue

KW - Fiber reinforced polymers

KW - Flexure

KW - Girders

KW - Retrofitting

KW - Steel

UR - http://www.scopus.com/inward/record.url?scp=0141998102&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=0141998102&partnerID=8YFLogxK

U2 - 10.1061/(ASCE)0733-9445(2003)129:2(186)

DO - 10.1061/(ASCE)0733-9445(2003)129:2(186)

M3 - Article

AN - SCOPUS:0141998102

VL - 129

SP - 186

EP - 196

JO - Journal of Structural Engineering

JF - Journal of Structural Engineering

SN - 0733-9445

IS - 2

ER -