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http://dx.doi.org/10.11112/jksmi.2014.18.2.108

Fatigue Evaluation of a Steel Bridge in Service through Stress History Measurement and Consideration of Stress Category  

Na, Sung-Ok (경상대학교 토목공학과)
Kwon, Min-Ho (경상대학교 토목공학과)
Cha, Cheol-Jun (한국시설안전공단)
Kim, In-Ho (한국시설안전공단)
Publication Information
Journal of the Korea institute for structural maintenance and inspection / v.18, no.2, 2014 , pp. 108-116 More about this Journal
Abstract
The proper stress history measurement should be conducted in order to examine the accurate cause of fatigue cracks or the fatigue safety in the steel bridge. Only one strain gauge is generally installed in the field for the stress history examination because of the field circumstances, economic feasibility, workability, and so on. However, this method may not consider the actual size of the specific structure, the gauge length, and the affect of stress concentration in the welded joint. In addition, it is difficult to apply for the stress analysis. Therefore, this study suggests improvements that are a great number of gauge installations, the gauge location adjustment, and the use of the minimum length gauge. It is drived the correlative equation of strain for the distance between the welding toe and the strain gauge installation, and compare correlative equation with equation of IIW. Also, this study could estimate the remaining life and fatigue damage of bridge in service by selecting the suitable stress category. In conclusion, it is possible to understand the member which is high in the fatigue cracks, and the quantitative relations between the welding toe and the strain gauge installation distances. The proposed approach in this study can make an more accurate fatigue damage and a remaining life prediction so that the improved method should be applied in measuring the strain of bridges from now on.
Keywords
Improved method; Correlative equation; Stress category; Fatigue damage; Remaining life;
Citations & Related Records
Times Cited By KSCI : 1  (Citation Analysis)
연도 인용수 순위
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