Stiffness analysis of deck truss girder bridge of steel

The train and the deck truss girder bridge were coupled together as one composite system.Deck truss girder bridge was idealized as an assemblage of finite truss element and the vehicle space vibration model of two-stage suspension was used,which has 26 degrees of freedom.The equations of the train and deck truss girder bridges time varying system were set up by using the principle of total potential energy with stationary value in elastic system dynamics and theset-in-right-positionrule for forming structural matrices.By taking the actual measured snake-like oscillations of bogie as excitation sources,the vibration responses of train and bridge were calculated when the train had passed through a deck steel truss girder bridge at different speeds.The results show that the bridge has sufficient lateral and vertical stiffness.