This paper presents a new passive vibration control system for reducing excessive traffic-induced vibration of bridges. The proposed system is developed by combining merits of king-post and tuned mass damper mechanism. The king-post mechanism that increases the stiffness of the bridge is used to reduce transient response of bridges when vehicles are on the bridge and the tuned mass damper mechanism that absorbs vibration energy is used to reduce steady-state response after vehicles cross the bridge. To verify the performance of the proposed system, a numerical simulation conducted on the existing bridge undergoing vibration problems due to moving vehicles. The simulation results show that the maximum displacement and acceleration at mid-span are more efficiently diminished than king-post or tuned mass damper alone. Therefore, the proposed system can be used to improve the serviceability and the structural safety of bridges under serious traffic-induced vibration.
