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Title
Japanese: 
English:Effect of Amplitude of Cyclic Loading on the Collapse Modes of I-Shaped Beams with Local Buckling 
Author
Japanese: 森 光士郎, 五十嵐 規矩夫, 三井 和也.  
English: Koshiro Mori, Kikuo Ikarashi, Kazuya Mitsui.  
Language English 
Journal/Book name
Japanese: 
English:Proceedings of the 11th International Conference on Behaviour of Steel Structures in Seismic Areas 
Volume, Number, Page         pp. 257–267
Published date July 3, 2024 
Publisher
Japanese: 
English: 
Conference name
Japanese: 
English:The 11th International Conference on Behaviour of Steel Structures in Seismic Areas 
Conference site
Japanese: 
English:Salerno 
DOI https://doi.org/10.1007/978-3-031-62884-9_23
Abstract In Japan, a series of destructive earthquakes (magnitude 7.0) occurred in a short period, resulting in a considerable interest in the low-cycle fatigue resistance of beam-end welds of beam-to-column connections with full-penetration welding. In the existing literature, various fatigue damage evaluation methods have been proposed based on the experimental results of stiffened beams aimed at preventing local buckling at the beam ends. However, because local buckling is expected to occur at the beam-ends of steel-framed structures, this study focused on conducting cyclic loading tests on I-shaped steel beams, allowing local buckling to occur at the beam-ends. In this study, we proposed novel fatigue curves based on the experimental results obtained from these tests. The experimental variables were the cross-sectional shape and constant amplitudes. Several constant loading amplitudes were applied to the same cross-sectional shape to investigate the effects of the constant amplitude and cross-sectional shape on the collapse mode. Based on these cyclic tests, when local buckling occurred, three collapse modes could be classified. These collapse modes were observed to vary depending on factors, such as the amplitude of the loading history and width-to-thickness ratio of the cross section. Additionally, this study revealed that the specimens that allowed for local buckling had larger deformation capacities until fracture than those that prevented local buckling at the beam ends.

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