A model considering the longitudinal track–bridge interaction in ballasted railway bridges subjected to high-speed trains

Abstract In this paper, a dynamic interaction model of the coupled system railway bridge, foundation, subsoil, ballast, track, and high-speed train is presented, with special emphasis on longitudinal between track bridge structure, taking into account flexibility ballast. After description system, equations motion are given separately for each subsystem. The discretization bedded rails performed by two different approaches. first approach, deflection expanded eigenfunctions finitely long beam representing rails. second, simplified response represented superposition static infinitely due to concentrated load. coupling structure achieved component mode synthesis technique, which in approach leads representation state-space. A discrete substructure technique used couple subsystem model. presented strategies verified comparison results finite element system. Several application examples reveal influence horizontal track–bridge other modeling parameters response.