修復領域を持つ短繊維補強コンクリート造円筒殻の耐力

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The strength of fiber chip reinforced concrete cylindrical shells with a retrofitted region was investigated, both experimentally and numerically. Features of the fiber chip reinforcement include good resistance to rust, acid and corrosion, and a light weight body. Nevertheless the strength of not only the fiber chip reinforced concrete shells but also their retrofitted shells can not be evaluated. This paper therefore focuses on the strength of carbon fiber chip reinforced concrete shells with retrofitted region, where the damaged region was confined to only within the local region on the shell structure. Carbon and vinylon fiber chips were separately applied as reinforcing materials on a concrete shell and their effects on strength were compared each other. Three kinds of retrofits, precut, filler, and sheeting, were defined and applied to the shells with damaged region. Firstly, precut retrofit was defined as the method for cutting the region adjacent to the damaged boundary to be smoothed in order to avoid stress concentration. Secondly, filler retrofit was defined as the method for filling the region with non-contracted mortar after precut retrofit. Finally, sheeting retrofit was defined as the method for covering the surface of the region with carbon fiber sheets after filler retrofit. Loading experiments were conducted on small-scale models with one-point concentrated load. Furthermore material and geometrical nonlinear FEM analysis considering fluctuations of the shell thickness was carried out to investigate the experimental results. By comparing experimental results with numerical ones, the strength of the concrete shell with retrofitted region was discussed taking into account different materials reinforced with carbon and vinylon fiber chips.
一般社団法人日本建築学会の論文
2011-03-25

修復領域を持つ短繊維補強コンクリート造円筒殻の耐力

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