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In this study, the authors conducted a fixed-point fatigue tests to evaluate the fatigue resistance of the Ultra High Strength Fiber Concrete using organic fibers. At first, the authors carried out the static loading tests, and examined the maximum load-bearing force and deformation behavior. Subsequently, after setting the load amplitude of 4 types, the authors conducted a fixed point fatigue test. In this case, the basis of the load amplitude was defined by using the results of the static tests. As a result of fixed point fatigue test, the correlation relationship of the loading times and load-bearing force ratio has been confirmed in the S-N curve. And then, the authors proposed the estimation equation for fatigue life. Furthermore, Ultra High Strength Fiber Reinforced Concrete using organic fibers was found to have utility and sufficient fatigue resistance.本研究は、有機繊維を用いた超高強度繊維補強コンクリートの耐疲労性を評価することを目的として、はり部材を用いて定点疲労試験を行った。実験では、まず静的載荷実験より、変形挙動および最大耐荷力に関する検討を行った。次に、静的載荷実験より得られた最大耐荷力を基準荷重として、荷重振幅を4種類設定して定点疲労試験を行い、曲げ疲労特性に関する検討を行った。その結果、耐荷力比と載荷回数から得られるS-N曲線において、これらの関係には相関性が得られることを示し、疲労寿命推定式を提案した。さらに、有機繊維を使用した超高強度繊維補強コンクリートは十分に耐疲労性が評価でき、実用性を有することを明らかにした。

FUNDAMENTAL STUDY ON BENDING FATIGUE CHARACTERISTIC OF ULTRA HIGH STRENGTH FIBER REINFORCED CONCRETE BEAM MEMBER USING ORGANIC FIBER