Effects of pier design on superstructure vibration

: Based on three span simple supported beam structure, this paper deals with the effects of pier design on beam vibration aiming at natural frequency and vehicle bridge vibration of the structure. The calculating model has been established. Some new ideas such as the critical rigidity of pier, the critical height of pier and the critical rigidity ratio of beam to pier are put forward in the paper. These ideas, which can abate beam vibration, are very useful in the pier design.