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용환선(Hwan Sun Yong),정경섭(Kyong Sup Jung) 한국강구조학회 1989 韓國鋼構造學會誌 Vol.1 No.1
On this condition of steel bridge member having a crack, occasionaly it is impossible to measure of stress history and to extract test specimen. Under this situation, tried to estimate remaining service life from statistical data on traffic and existing results of fatigue test without measuring of stress history and fatigue test. The main results are as following (1) Stress history of simple beam estimated from Montecallo simulation method with probabilistic model of traffic can be use to estimate remaining fatigue life instead of measuring of stress history. (2) In such a case measuring of remaining fatigue life at bridge member having a crack, influences of RMS model and RMC model on fatigue crack growth rate are not differ without difference of applied stress range. (3) Application of cut off method may be overestimate remaining fatigue life.
김태봉,박종인,구봉근,정경섭 충북대학교 건설기술연구소 1992 建設技術論文集 Vol.11 No.1
This study is attempeted to predict experimentally the fatigue crack propagation behavior of steel plates with circular holes for various hole size. To establish the evaluation of the initiation life of fatigue crack and life of failure in structural steel SS41, fatigue test for crack growth with constant load-amplitude accomplished and to investigate the effect of hole size, stress intensity factors are considered as functions of normalized crack length for various types of hole size. Fatigue crack length were measured by the eye-observation and beach mark method The results indicate a strong dependence of the stress concentration factor around hole for various hole size.