THE STUDY ON DYNAMIC INTERACTIONS BETWEEN VIADUCT AND JOINTLESS TURNOUT IN HIGH-SPEED RAILWAY

With the rapid development of modern high-speed railway, more and more switches will be settled on bridge or viaduct, including some continuous welded switches. It colligates technical characteristics and difficulties of jointless track and continuous welded switch, which haven't been researched systematically in and abroad. This article bases on the development and application requirement of the continuous welded switch paved on bridge, using the theory of vehicle-turnout bridge interactions, focusing on the No. 18 moveable-turnout, build the vehicle-turnout-bridge coupling dynamic modal. This article originally uses a large-scale general finite element software ABAQUS to study the dynamic interaction of vehicle-turnout-bridge system. When the train running through the turnout straight at the velocity of 350 km/h, Dynamic behaviours of the system were mainly studied and effects of different velocities to the system's dynamic characters were comparatively analysed. Stiffness of fasteners and bridges were also taken into account with controlling variable method to analyse their effects to dynamic behaviours of the system.