Extremely Low Cycle Fatigue Assessment for Welded Joints Based on Peak Strain Approach

Hanji, Takeshi; Tateishi, Kensuke; Minami, Kuniaki; Kitoh, Kazuya

doi:10.2208/jsceja.62.101

Cited by 4 publications

(3 citation statements)

References 4 publications

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“…So the weld toe radius was 0.60mm. Flank angle was set as 45 o since its influence on the local strain distribution is negligible 13) . Then parameters a and b in Eq.…”

Section: (2) Analytical Resultsmentioning

confidence: 99%

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Extremely Low Cycle Fatigue Assessment Method for Un-Stiffened Cantilever Steel Columns

TATEISHI

Chen

Hanji

2008

Structural Eng./Earthquake Eng.

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This paper presents the results of un-stiffened cantilever column subjected to incremental or constant amplitude cyclic loading. The objectives of this study are to investigate the extremely low cycle fatigue life of the column and verify the proposed strain based approach. During the test, fatigue cracks initiated from the weld toe at the corner and propagated along the weld toe. Finally, the column ruptured without a local buckling. The failure of low cycle fatigue induced by large cyclic deformation has been elucidated. In a further step, the crack initiation life was estimated based on the local strain by proposed simple approach. It is indicated that correlation between the test result and the estimated life was good enough.

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“…So the weld toe radius was 0.60mm. Flank angle was set as 45 o since its influence on the local strain distribution is negligible 13) . Then parameters a and b in Eq.…”

Section: (2) Analytical Resultsmentioning

confidence: 99%

“…(1). We have already applied this concept to T shaped weld joint and obtained a successful result 13) . In this trial, the local strain at the weld toe was obtained by finite element analysis with fine mesh.…”

Section: Methodology Of Extremely Low Cycle Fatigue Assessmentmentioning

confidence: 99%

Extremely Low Cycle Fatigue Assessment Method for Un-Stiffened Cantilever Steel Columns

TATEISHI

Chen

Hanji

2008

Structural Eng./Earthquake Eng.

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“…Recently, it has been noted that the possibility of cracks or fractures in steel frame members occurs because of low or extremely low cycle fatigue in steel frame structures under severe ground motion (Hanji et. al., 1980;Sakano et al, 1997;Teran-Glimore et al, 2004;Hasegawa et al, 2014).…”

Section: Fracture Mechanism Focused Onmentioning

confidence: 99%

Seismic analysis method for steel frame structures considering fracture of structural members based on shaking table tests

Shiomi

2019

Mechanical Engineering Journal

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This paper proposes a seismic analysis method based on nonlinear dynamic analysis to consider the fracture of steel frame structural members during earthquakes. The approach corresponds to real fracture mechanism, especially low cycle fatigue failure. The fracture judgment condition in the analysis method was determined using the shaking table test for steel frame structures. In the shaking table tests, fractures at the column-beam connection which were considered to be due to fatigue cracks, were observed. From a fractographic study of the fracture surface and the Finite Element Analysis study after the test, these fractures were confirmed to be a result of low cycle fatigue; therefore, a low cycle fatigue evaluation method was integrated into the proposed analysis method. By applying both the proposed analysis method and the ordinal method which does not consider member fracture, the effects of member fracture on the seismic performance of a whole structure were examined. The effects on factors such as whole stiffness, equivalent periods and damage distributions after severe ground motion were marked. It is preferable that these effects be taken into account in seismic performance evaluations for very severe ground motions in which the occurrence of structural component failure is suspected.

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Extremely Low Cycle Fatigue Assessment Method for Un-Stiffened Cantilever Steel Columns

Tateishi

Chen

Hanji

2008

JSCE JOURNAL OF STRUCTURAL AND EARTHQUAKE ENGINEERING

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Extremely Low Cycle Fatigue Assessment for Welded Joints Based on Peak Strain Approach

Cited by 4 publications

References 4 publications

Extremely Low Cycle Fatigue Assessment Method for Un-Stiffened Cantilever Steel Columns

Extremely Low Cycle Fatigue Assessment Method for Un-Stiffened Cantilever Steel Columns

Seismic analysis method for steel frame structures considering fracture of structural members based on shaking table tests

Extremely Low Cycle Fatigue Assessment Method for Un-Stiffened Cantilever Steel Columns

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