鉄筋コンクリートシェルは、柱の無い大きな空間を覆う構造形式として主に建築屋根として用いられてきた。これまでに鉄筋コンクリートシェルの耐力を評価する研究は、理論的研究に基づく方法、座屈耐力に基づく方法、数値解析に基づく方法、実験的研究に基づく方法など多くの研究成果が報告されてきた。国内外で竣工後50-60年が経過した鉄筋コンクリートシェルは、経年劣化やコンクリートのひび割れによる耐力低下が懸念されているため、コンクリートのひび割れ抑制および修復を施したシェル耐力を適切に評価することは重要となる。%Concerning with the conventional steel reinforced concrete shell, some serious problems such as, carbonation in concrete with joints or cracks, low strength against tensile force, etc. have been shown. However newly innovated materials for reinforcement on a concrete shell in order to be able to improve the above problems occurred recently. These are glass fiber chips, carbon fiber chips, carbon fiber sheets, etc. Up to now, the retrofitted strength of concrete shells focusing on both mixed-in fiber and steel reinforcements has hardly been reported and evaluated. In this paper, newly focusing on both mixed-in fiber and steel reinforcements, the retrofitted strength of reinforced concrete cylindrical shells was investigated, both experimentally and numerically. This paper treats the case of shell structure damaged only within alocal region. Three kinds of retrofits consisting of precut retrofit, filler retrofit and sheeting retrofit to the damaged shells were adopted. An experimental study was conducted on smalt-scale models under a one-point concentrated load. Furthermore a numerical study was conducted by material and geometrical nonlinear FEM analysis considering fluctuations of the shell tiiickncss. The retrofitted strength of mixed-in fiber and steel reinforced concrete shells was discussed based on the results of experiments and numerical analyses.
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