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高強度せん断補強筋の開発

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川崎製鉄技報

KAWASAKI STEEL GIHO Vol. 23(1991) No.2

高強度せん断補強筋の開発

Development of Super-High-Strength Shear Reinforcement for Structural Reinforced Concrete Members

柴田 正隆(Masataka Shibata) 中澤 淳(Atsushi Nakazawa) 白石 環(Tamaki Shiraishi) 山本 昇(Noboru Yamamoto) 小阪 清(Kiyoshi Kosaka) 志賀 勝利 (Katsutoshi Shiga) 要旨 : 鉄筋コンクリート建築物における部材のせん断補強用鉄筋に,高強度PC鋼棒リバーボン を採用することで高強度せん断補強筋の開発を進めてきた。実験は,建研式載荷装置を用 いて,柱,梁に関する部材実験を行い,破壊にいたる力学的性状を調査した。その結果, 実験耐力は,既往のRC規準に示される許容せん断力式および終局耐力設計での修正荒川 min式に比較して,すべて安全側を示した。さらに,最大耐力時以降に補強筋に生じる 応力が,軸力が高い場合には100kgf/mm2以上に達することを明らかにし,降伏応力 度 130kgf/mm2クラスのせん断補強筋が鉄筋コンクリート部材のせん断耐力向上お よび靱性の確保に効果的であることを立証した。 Synopsis :

Super-high-strength shear reinforcement having 130kgf/mm2 yield stress has been developed for reinforced concrete members in buildings. Experimental investigation has been carried out on reinforced columns and beams to examine their strength and ductility against shear force in the seismic design. The result shows that experimental strengths are well above design loads which are estimated by shear strength formulae. It is also shown that the strength of the material is fully exerted over 100kgf/mm2 in interior reinforcing hoops, when the columns are loaded with higher axial thrust in addition to horizontal storey shear. Therefore, it is suggested that application of the super-high-strength lateral reinforcements in members of high-rise buildings exerts high efficiency in both the structural design and construction works at site.

(c)JFE Steel Corporation, 2003

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