Analysis of Behavior of Train and Track at Transition Zone between Floating Slab Track and Conventional Concrete Slab Track
플로팅 슬래브궤도와 일반 콘크리트궤도 접속부에서의 열차 및 궤도의 거동 분석
- 장승엽 (한국철도기술연구원, 초고속열차연구실) ;
- 양신추 (한국철도기술연구원, 차륜궤도연구실) ;
- 박만호 (한국철도시설공단, KR연구원) ;
- 조수익 (한국철도시설공단, KR연구원)
- Published : 2009.05.21
It is of great importance to assure the running safety and ride comfort in designing the floating slab track for the mitigation of train-induced vibration. In this paper, for this, analyzed are the system requirements for the running safety and ride comfort, and then, the behavior of train and track at the transition zone between the floating slab track and the conventional concrete slab track according to several main design variables such as spring constant, damping coefficient, spacing and arrangement of isolators and slab length, using the dynamic analysis technique considering the train-track interaction. The results of numerical analysis demonstrate that the discontinuity of the support stiffness at the transition results in a drastic increase of the vertical vibration acceleration of the train body, wheel-rail interaction force, rail bending stress and uplift force. The increase becomes higher with the decrease of the spring constant of isolators and the increase of the isolator spacing, but the damping ratio does not significantly affect the behavior of train and track at the transition. Therefore, to assure the running safety and ride comfort, simultaneously increasing the effectiveness of vibration isolation, it is effective to minimize the relative vertical offset between the floating slab and the conventional track slab by adjusting the spring constant and spacing of isolators at the transition.