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Formulation for Reliability-based Fatigue Assessment of Car Body for High Speed Train Passing Through Tunnels  

Seo Sung-Il (한국철도기술연구원, 기존철도사업단)
Min Oak-Key (연세대학교 기계공학부)
Park Choon-Soo (한국철도기술연구원, 고속철도기술개발사업단)
Publication Information
Journal of the Korean Society for Railway / v.8, no.4, 2005 , pp. 348-353 More about this Journal
Abstract
In designing the structures of railway rolling stocks, deterministic methods associated with the concept of a safety factor have been traditionally used. The deterministic approaches based on the mean values of applied loads and material properties have been used as safety verification for the design of rolling-stock car body structures. The uncertainties in the applied loading for the high speed train and the strength of new materials in the rolling stocks require the application of probabilistic approaches to ensure fatigue safety in the desired system. Pressure loadings acting on the car body when the train passes through tunnels show reflected pressure waves for high-speed trains and they may cause a fatigue failure in vehicle bodies. Use of new material technology as body structures also introduces uncertainties in the material strength. A probabilistic approach is more adaptable in designing reliable structures when the pressure waves from the tunnels pounds and new material technology is adopted. In this paper, it is proposed that a fatigue design and assessment method based on a reliability which deals with the loading variations on a railway vehicle due to the pressure reflected in tunnels and the strength variations of material. Equation for the fatigue reliability index has been formulated to calculate the reliability assessment of a vehicle body under fluctuating pressure loadings in a tunnel. Considered in this formulation are the pressure distribution characteristics, the fatigue strength distribution characteristics, and the concept of stress-transfer functions due to the pressure loading.
Keywords
Reliability Index; Fatigue Assessment; Car body; High speed train; Pressure fluctuation;
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