EXTENDING FATIGUE LIFE OF CRACKED OUT-OF-PLANE GUSSET BY ICR TREATMENT

EXTENDING FATIGUE LIFE OF CRACKED OUT-OF-PLANE GUSSET BY ICR TREATMENT

Numerous fatigue cracks have been found in steel bridges. To maintain steel bridges, repair and retrofit methods of such fatigue cracks have been developed. One technique we developed was to produce plastic deformation of the steel surface near the crack in order to close crack opening by using air...

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Veröffentlicht in:Doboku Gakkai Ronbunshuu A 2010, Vol.66(2), pp.264-272
Hauptverfasser: ISHIKAWA, Toshiyuki, YAMADA, Kentaro, KAKIICHI, Takumi, LI, Hui
Format: Artikel
Sprache:eng ; jpn
Schlagworte:
Bending fatigue
Bridges (structures)
Crack propagation
Cracks
Fatigue failure
Fatigue life
fatigue strength improvement
Fatigue tests
ICR treatment
out-of-plane gusset plate
plate bending
Retrofitting
Structural steels
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Beschreibung
Zusammenfassung:Numerous fatigue cracks have been found in steel bridges. To maintain steel bridges, repair and retrofit methods of such fatigue cracks have been developed. One technique we developed was to produce plastic deformation of the steel surface near the crack in order to close crack opening by using air tool. This method is called Impact Crack Closure Retrofit treatment (ICR treatment). We carried out plate bending fatigue tests of out-of-plane gusset specimens. Fatigue cracks at turn-around welds and those which propagated 10mm were ICR-treated. Fatigue test results of specimens after ICR treatment showed significant improvement of the remaining fatigue life.
ISSN:1880-6023
1880-6023
DOI:10.2208/jsceja.66.264