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Journal of the Korean Society of Hazard Mitigation 2011;11(4):31-40.
Published online August 31, 2011.
고속철 PSC 박스거더 교량의 통과차량 윤하중 동적해석
오순택, 이동준, 심영우, 김한수
Dynamic Analysis of a Wheel force for a Running High-Speed Vehicle on Railway PSC Box Girder Bridge
Soon-Taek Oh, Dong-Jun Lee, Young-Woo Shim, Han-Su Kim
Abstract
A dynamic analysis procedure is developed to provide a comprehensive estimation of the dynamic responses of locomotive`s wheels running over a Pre-Stressed Concrete (PSC) box girder bridge on the Korea high speed railway. Particularly, a three dimensional numerical model including the structural interaction between high speed vehicles, bridges and railway endures to analyze accurately and evaluate with in-depth parametric studies of the bridge lengths (25, 30, 35, 40 m) for dynamic responses of railway vehicle wheel forces due to the critical crossing speeds (300~315 km/h) on the bridges. The high-speed railway locomotive (KTX) is used as 38-degree of freedom system. Three displacements (vertical, lateral and longitudinal) as well as three rotational components (pitching, rolling and yawing) are considered in the 38-degree of freedom model. Three dimensional frame element is used to model the PSC box girder bridge, simply supported span length of 40m. The irregulation of rail-way is derived using the exponential spectrum density function under assumption of normal probability procedure. The results of dynamic analysis by Runge-Kutta method which are able to analyze considering the dynamic wheel forces between bridges and normal rail-ways are compared and contrasted. It is presented as an wheel forces spectrum that is varying either the bridge lengths or the critical crossing speeds.
Key Words: Wheel forces; PSC-box bridge; High-speed railway; Dynamic analysis; Runge-Kutta method
요지
현재 공용중인 고속철 차량(KTX)과 궤도 그리고 교량 구조물을 총괄적으로 고려한 해석모델을 개발하여 고속철 차량의 교량 통과시 임계속도(300~315 Km/h)에 대한 차량 윤하중의 동적 거동특성을 해석하였다. 해석차량은 적용가능한 모든 운동조건을 고려하여 고속철 동력차를 38자유도 모형으로 개발하였고, 차체와 대차의 연직 변위, 횡 변위, 종 변위 및 피칭, 롤링, 요잉을 모두 고려하였다. 대상교량은 PSC BOX 교량으로 각각 25 m, 30 m, 35 m, 40 m 경간길이를 갖는 단순교를 3차원 공간뼈대 요소를 사용하여 모형화 하였고, 궤도의 불규칙성은 정상 확률과정으로 가정하여 지수스펙트럼 밀도함수를 사용하여 설정하였다. 개발된 교량, 궤도, 열차모델을 총괄적으로 해석하여 주행하는 고속철 차량이 각 경간별 교량을 통과하는 과정에서 발생하는 차량 윤하중과 일반도상 통과시 발생하는 윤하중을 Runge-Kutta 기법으로 산출하여 비교 분석하고, 교량 경간길이 별 차량속도에 따른 윤하중 스펙트럼을 분석하고자 한다.
핵심용어: 윤하중; PSC박스 교량; 고속철차량; 동적해석; Runge-Kutta 기법
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