수직진동하중을 받는 궤도형 구조물의 거동

Abstract

철도궤도시스템은 레일과 침목, 도상, 보조도상 및 노반으로 구성되는데 이들 요소들은 다른 역학적 특성을 지니고 있어 그 역할과 거동양상이 서로 독특하며, 그 거동과 음력의 규명은 어려운 일이다.

본 연구에서는 철도궤도시스템을 궤도와 지반으로 단순화시킨 궤도형 구조물에 대한 동역학적 거동을 규명하기 위한 동적해석을 수행하였다. 수직진동하중 하에서의 적용될 하중 진폭을 산정하기 위한 예비해석으로 대상지반의 극한지지력을 구하였으며, 다층의 궤도지반에 대한 변위함수와 진동수와의 관계를 밝혔다. 또한 궤도지반의 공진진동수와 실제 궤도지반에서 측정되는 진동수 범위의 수직진동하중 하에서 동적응답과 도상타입의 변화가 동적해석 시 각각 지지력 변화에 미치는 영향을 알아보기 위하여 FLAC을 이용한 수치해석이 수행 되었다.

In general the rail-tie-soil system is composed rail, tie, ballast, subballast and subgrade, because of this elements have different dynamic peculiarity, the roles and the movements are peculiar, then the examine of movements and stresses is very difficult.

On study the dynamic analysis were worked for examine dynamical movements about the rail-tie-soil system which is simplified rail and soil medium. The ultimate bearing capacity of the subject soil medium was worked preparation explanation for estimate force amplitude. Under the vertical vibrated loads which is in the natural frequency and another frequency ranges the dynamic response of soil medium and the effects of the various features associated with the ballast type was worked

In general the rail-tie-soil system is composed rail, tie, ballast, subballast and subgrade, because of this elements have different dynamic peculiarity, the roles and the movements are peculiar, then the examine of movements and stresses is very difficult.

On study the dynamic analysis were worked for examine dynamical movements about the rail-tie-soil system which is simplified rail and soil medium. The ultimate bearing capacity of the subject soil medium was worked preparation explanation for estimate force amplitude. Under the vertical vibrated loads which is in the natural frequency and another frequency ranges the dynamic response of soil medium and the effects of the various features associated with the ballast type was worked