STUDY ON FRACTURE TOUGHNESS AND CRITICAL CRACK LENGTH OF EXISTING STEEL HIGHWAY BRIDGE MEMBERS

STUDY ON FRACTURE TOUGHNESS AND CRITICAL CRACK LENGTH OF EXISTING STEEL HIGHWAY BRIDGE MEMBERS

In this study, fracture toughness of existing steel highway bridge members was investigated by CTOD and Charpy Impact tests, and critical crack length, at which fatigue crack shifts to the brittle fracture, was discussed. Critical CTOD value, δc became 0.058mm(-30℃) and 0.027mm(-50℃) based on the lo...

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Veröffentlicht in:Kou kouzou rombunshuu 2012/03/29, Vol.19(73), pp.73_53-73_64
Hauptverfasser: MURAKOSHI, Jun, SAWADA, Mamoru
Format: Artikel
Sprache:eng ; jpn
Schlagworte:
Bridges (structures)
Brittle fracture
Charpy impact test
Crack opening displacement
Crack propagation
Critical crack length
Fatigue crack
Fatigue failure
Fracture mechanics
Fracture toughness test
Highway bridges
Steel bridge
Structural steels
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Zusammenfassung:In this study, fracture toughness of existing steel highway bridge members was investigated by CTOD and Charpy Impact tests, and critical crack length, at which fatigue crack shifts to the brittle fracture, was discussed. Critical CTOD value, δc became 0.058mm(-30℃) and 0.027mm(-50℃) based on the lower value obtained by the CTOD tests (4 bridges) and Charpy impact tests (13 bridges). Based on δc, critical crack length was estimated for fatigue crack growth at web gusset welded joints of steel I-girder bridges.
ISSN:1880-9928
1884-0329
DOI:10.11273/jssc.19.73_53