S-Space College of Engineering/Engineering Practice School (공과대학/대학원) Dept. of Civil & Environmental Engineering (건설환경공학부) Theses (Master's Degree_건설환경공학부)
Framework for Reliability-Based Fatigue Life Evaluation of Deteriorated Steel Structural Members
노후 강부재의 신뢰도기반 피로수명 산정 기법 프레임워크
- 공과대학 건설환경공학부
- Issue Date
- 서울대학교 대학원
- Deteriorated Steel Structural Member; Fatigue Life Evaluation; Reliability Analysis; Scenario of Deterioration
- 학위논문 (석사)-- 서울대학교 대학원 : 공과대학 건설환경공학부, 2018. 2. 김호경.
- This thesis presents a framework for reliability-based fatigue life evaluation of deteriorated steel structural members. A technique is suggested to perform fatigue life evaluation when crack or corrosion is detected on deteriorated steel members.
Firstly, fatigue lives associated with crack or corrosion are calculated based on the linear elastic fractures mechanics and the stress-strain approach. Stress concentration factors of corrosion pits are determined by finite element analysis and regression analysis for fatigue notch factors in the stress-strain approach. Secondly, scenarios according to the type of defect found in the inspection and the limit states for each scenario are set. Lastly, a case study is conducted for the existing steel bridge using field monitoring data and confirmed the effectiveness of the proposed procedures. A reasonable condition criteria for a deteriorated steel structural member is presented using the reliability index obtained from the reliability analysis. When the results are compare to the existing condition criteria, it is possible to present a quantitative measure and confirmed that the engineering basis can be secured because the criteria was set based on the reliability index.