몬테카를로 시뮬레이션에 의한 대차 프레임의 구조 신뢰성 평가

초록

A railway vehicle is composed of two bogies and a car body. Bogie frame is the main structural element which supports loadings from the car body and wheels. Therefore, a strict structural reliability, more than 25 years’ durability, is needed. In the past, deterministic lifetime estimation was mostly applied. But in recent years, probabilistic approaches have been studied to consider the uncertain aspects of the various parameters related to the lifetime of structures. In this study, a limit state function using an equivalent stress was introduced, and Monte Carlo simulation method was applied. By using measured strain data, failure probability of the bogie frame after 25 years’ running was obtained.