低降伏点鋼を用いた鋼管補剛平鋼ブレースの疲労特性に関する実験的研究

概要

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Recently low vield stress steel has been used for hysteretic dampers. Use of such low yield stress steel ensures yielding relatively small strain. For design of hysteretic dampers with low yield stress steel quantification of hysteretic characteristics and deformation capacity are very important. In this paper, a fatigue characteristic of low yield stress steel and a fatigue performance of flat-bar brace with low yield stress steel stiffened by square tube are discussed. In order to investigate the fatigue characteristic of low yield stress steel which strength are 100 N/mm^2, 160 N/mm^2 and 235 N/mm^2 and a fatigue life of brace member, fatigue tests were carried out. The conclusion of this study can be summarized as follows; 1) The fatigue characteristic of this brace can be expressed by the Manson-Coffin law. 2) By estimating a strain of a fracture part, the fatigue life of this brace is possible to be expressed by the fatigue life of the material on low strain amplitude. 3) The fatigue life of welded joint of flat-bar brace was decided in stress concentrating by a welding toe of weld under 1%. The fatigue life of flat-bar brace can be long with improved detail of welded joint. 4) This welded joint of this brace is not fractured due to a repeating buckling deformation over 1% strain amplitude.
社団法人日本建築学会の論文
2000-04-30