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Journal of the Korean Society of Hazard Mitigation 2007;7(5):11-18.
Published online December 31, 2007.
고인성 섬유보강 시멘트 모르터의 휨피로거동
임남형, 이진옥, 장선재, 류효진
Flexural Fatigue Behavior of High Performance Fiber Reinforced Cement Mortar
Nam-Hyoung Lim, Chin-Ok Lee, Sun-Jae Jang, Hyo-Jin Ryu
Abstract
A laboratory investigation was conducted to characterize the flexural fatigue behavior of high performance fiber reinforced cement mortar. Five specimens for statics flexural test and fourteen specimens for the flexural fatigue test were made based on the fiber mixing ratio. Static flexural tests were firstly performed to obtain magnitudes of static failure loads and stress levels before flexural fatigue tests. The flexural fatigue behaviors were investigated based on the stress level and fiber mixing ratio. Also, the equations for the interrelation of the flexural fatigue stress levels with the number at loading cycle were proposed.
Key Words: Fiber reinforced cement; Flexural fatigue; Fatigue crack; Fiber mixing ratio
요지
고인성 섬유보강 시멘트 모르터의 휨피로 거동을 규명하고자 실내실험을 실시하였다. 정적 휨실험과 휨피로 실험을 위해 섬유혼입율에 따라 5개의 시험체와 14개의 시험체를 각각 제작하였다. 휨피로 시험에 앞서서 정적 파괴하중과 응력수준을 결정하기 위하여 정적 휨시험이 실시되었다. 피로응력수준과 섬유혼입율에 따른 휨피로 거동을 분석하였으며 휨피로응력수준과 파괴시 하중반복회수와의 상관관계식을 제안하였다.
핵심용어: 섬유보강 시멘트; 휨 피로; 피로 균열; 섬유 혼입율


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