The mechanical properties of lead rubber bidirectional seismic isolated railway bridges under train loads were studied

and a real time modal synthesis method for researching the train-bridge coupling vibration responses of non-linear bridges was proposed.With respect to the problems in bidirectional seismic isolated railroad bridges

the solution by installing steel restrainers was presented

and then

the train-bridge coupling vibration dynamic response analysis of the bidirectional seismic isolated railway bridges with steel restrainers was carried out.The studies show that

when using the conventional isolation design approaches

the initial stiffness and yield strength of lead rubber bearing in the lateral direction cannot meet the requirements of the standard.However

after installing the steel displacement restrainer

the mechanical properties of bidirectional seismic isolated railroad bridges were improved greatly and each indicator can meet the demand of safety and stationarity for train operating.