Kou kouzou rombunshuu
Online ISSN : 1884-0329
Print ISSN : 1880-9928
ISSN-L : 1880-9928
A PREDICTION METHOD OF LOCAL STRAIN RANGE AT WELD TOE OF VARIOUS JOINTS
Masaru SHIMIZUKazuo TATEISHITakeshi HANJINaoya HONDA
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2018 Volume 25 Issue 97 Pages 97_61-97_66

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Abstract

Welded joints in steel structures are subjected to high strain amplitude during earthquake, which could cause a low cycle fatigue crack. To assess low cycle fatigue strength of welded joints, an estimation method based on local strain range at a crack initiation point has been established. In this method, an FE model with extremely-fine mesh is needed to obtain the local strain range accurately. In this paper, a prediction method of the local strain range from a model with relatively coarse mesh was proposed. Strain ranges obtained from coarse-mesh models were related to the local strain ranges from fine-mesh models. A prediction formula of the local strain range which is applicable to T-shaped joints, cruciform joints and out-of-plane gusset joints was established.

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© 2018 Japanese Society of Steel Construction
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