Passive Control Of Tian Xing Zhou Bridge Caused By Brake And Seismic Response

Tianxinzhou Bridge is the transportation key project, which is heavily invested in economy and has important influence on national economy. The bridge takes the structural style of the main floating girder, which can reduce the force of structure but can increase displacement of main girder. Once destructed in earthquake, it will make huge economic loss. Braking can caused the longitudinal displacement dynamic response of main girder of the railway bridge. There are four lane of train in main deck The influencing of braking to the vibration of main deck can not neglect. The longitudinal vibration of main deck of the Tianxinzhou Bridge under earthquakes and braking excited must be control in order to satisfied designer demand. The installation of viscous dampers in the long-span bridge can't increase the stiffness of the structure and the deck of the bridge can deform freely because of temperature fluctuation. At the same time it can reduce the vibration response of the long-span bridge, because viscous dampers can consume a lot of energy created by earthquake and braking. So it is an ideal earthquake reduction technique for the long-span. The research on the design method of the fluid damper which will be used to control the longitudinal vibration of main deck of the Tianxinzhou Bridge under earthquakes and braking excited are proposed. Then the coefficient of viscous dampers was modulated by suboptimal control method. This paper has studied some relative research work as following.(1) The hook model of train has the high non-linear characteristic, this article uses the iteration method which changes the stiffness of the model process train first kind of fraction point question of the model and build equation of hook and braking. The result indicated that the method which changes the stiffness of the model be able fast get the vehicle stress on hook.(2) Build the three-dimensional finite element model of bridge and analysis the dynamic response of the bridge model. 8 dampers have been set up on the junction of bridge tower and the main beam, study the effect of the main deck vibration response control by viscous dampers. (3) Optimum the parameter of viscous dampers. Minimum Error Excitation Method and Minimum Norm Method were used to search the parameter of the fluid damper which is close to the effect obtained with the active control method. Then the coefficient related to the control force and the longitudinal displacement was modulated to make that both the control force and the longitudinal displacement of the main deck were reduced to a reasonable level.