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■■■■■■■■■■■■■■■■■■■ 川崎製鉄技報 KAWASAKI STEEL GIHO Vol. 22(1990) No.1 ■■■■■■■■■■■■■■■■■■■ |
| 建築用低降伏比高張力鋼を用いた柱梁接合部の構造特性 Full-Scale Experiment on Elastic-Plastic Behaviour of Beam-to-Colomn Connection Fabricated from High Strength and Low Yield Ratio Steel for Building Use 永易 正光(Masamitsu Nagayasu) 安田 博和(Hirokazu Yasuda) 弟子丸 慎一(Shin’ichi Deshimaru) 藤野 博(Hiroshi Hujino) 内田 清(Kiyoshi Uchida) |
| 要旨 : 建築用低YR53，60キロ級鋼を用いて，母材および各種溶接継手部の性能試験，柱梁接合部の極低サイクル疲労試験および実大曲げ実験を行い，以下のことから鉄骨構造物に当該鋼を適用した場合の健全性，安全性を実証した。(1)TMCP製53キロ鋼および2相域焼入れ製60キロ鋼はそれぞれの母材目標性能を十分満足し，また耐溶接割れ性にも優れている。(2)大入熱溶接された場合，熱影響部が軟化するが，継手強度は十分で，靭性も目標値を確保することができる。(3)柱梁接合部の巨大地震時における繰返し強度は問題ない。(4)60キロ鋼による柱梁接合部の曲げ耐力および変形能力は低YR化によって向上し，優れている。 |
| Synopsis : Mechanical properties of the base metal and welded joints as well as low cycle fatigue strength of the beam-to-column connection using low YR (yield ratio) 53 and 60kgf/mm2 steel plates, which have been newly developed for building use, have been investigated. The flexual strength of the beam-to-column connection in full-scale using the materials mentioned above also has been examined. Each steel plate has been demonstrated to be safe and reliable when applied to the steel structure. The principal results obtained are as follows:(1) Steel plates with low YR 53kgf/mm2 produced by TMCP and 60kgf/mm2 produced by ferrite and austenite dual-phase region quenching meet aimed properties and have good anti-cracking characteristics. (2) Tensile strength and toughness of the joint are satisfactory, although HAZ softening occurs at welding with a large heat input. (3) Fatigue strength of the beam-to-column connection against the severe earthquake is sufficient. (4) Flexual strength and deformability of the beam-to-column connection with 60kgf/mm2 steel plates are superior, and improved owing to its low YR. |
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