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Title
Japanese:局部座屈および延性き裂により耐力劣化が生じる溶接組立Ｈ形断面梁部材の繰返し履歴下における性能評価 
English:EVALUATION OF STRUCTURAL PERFORMANCE OF BUILT-UP I-SHAPED BEAM MEMBERS WITH RESISTANCE DEGRADATION DUE TO LOCAL BUCKLING AND DUCTILE CRACK PROPAGATION UNDER CYCLIC LOADING 
Author
Japanese: 五十嵐 規矩夫, 三井 和也, 森 光士郎, 木村 征也, 内田 衞, 二階堂 真人, 桑田 涼平.  
English: Kikuo Ikarashi, Kazuya Mitsui, Koshiro Mori, Seiya Kimura, Mamoru Uchida, Masato Nikaido, Ryohei Kuwada.  
Language Japanese 
Journal/Book name
Japanese:日本建築学会構造系論文集 
English:Journal of Structural and Construction Engineering (Transactions of AIJ) 
Volume, Number, Page Vol. 91    No. 840    pp. 306–317
Published date Feb. 1, 2026 
Publisher
Japanese:一般社団法人 日本建築学会 
English:Architectural Institute of Japan 
Conference name
Japanese: 
English: 
Conference site
Japanese: 
English: 
File
DOI https://doi.org/10.3130/aijs.91.306
Abstract This study investigates the influence of member geometry and loading history on the deformation capacity of welded I-shaped steel beam members under cyclic loading that permits local buckling. Three ultimate limit states are defined, and deformation capacity curves up to each state are established based on the lower-bound results from constant-amplitude cyclic loading tests. It was confirmed that beam members experiencing large-amplitude cycles inducing local buckling exhibit improved deformation capacity compared to those with lower local buckling damage. This is attributed to strength degradation in the beam and the resulting mitigation of plastic strain accumulation at the welded ends.

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