断続繊維で補強された鋼繊維補強コンクリートの強度に関する研究 (第3報)

概要

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Recent studies have shown that concrete reinforced with short lengths of steel fibers possesses some improved characteristics when compared to ordinary concrete. Steel fiber reinforced concrete (SFRC) is reinforced with short and discontinuous fibers, randomly oriented and uniformly dispersed. Because of the relatively small cracking strain of Portland cement concrete or mortal, initial cracking occurs at a relatively early stage. The matrix crack is bridged by discontinuous fibers. As the result, a signficant contribution of the fibers occurs after the matrix starts cracking. The authors carried out a series of pull-out tests on SFRC subjected to tensile loading. Empirical formula was obtained of peak pull-out loads of straight and/or inclined fibers. The authors also carried out the probabilistic analysis of the number of fibers contributing to tensile strength. In the present paper, the authors carried out theoretical analysis of the expected strength of SFRC. It was confirmed that the expected strength of SFRC could be increased by aligning the fibers with the loading direction.
社団法人日本船舶海洋工学会の論文
1982-12-30