|
Title |
The Effects of Braking of Trains and Roughness of Rails on the Dynamic Behaviors of Bridges
|
|
Keywords |
차량과 교량의 상호작용 ; 교각에 작용하는 열차 동하중 ; 조도성분 ; 제동효과 ; train-bridge Interaction ; dynamic train loads acting on piers ; roughness ; braking effect |
|
Abstract |
The effects of braking of trains and roughness of rails on the dynamic behavior of bridges are studied. The train-bridge interaction is considered by solving Lagrange's equation of motions. Newmark's direct integration is used to solve the governing equations. Dynamic train loads acting on piers at each time step are evaluated, and the wheel-rail roughness effect is considered by using the PSD curve of the rail. The model of braking forces in bridge section is based on the change of deceleration mentioned in ASTM(American Society for Testing and Materials) E503-82. Only skidding frictions without considering rolling frictions are modeled, and the friction coefficient of 0.25 is assumed. Parametric studies in a simply supported PC Box girder bridge are carried out to verify the present method and to analyze the effects of train speed, wheel-rail roughness, braking forces on dynamic train loads.
|