The Design And Functions Of Bridge's Fluid Viscous Damper

The vibration technology on engineering structure has been improved a lot from the traditional design method on damping vibration to the structural vibration control method. So it can be said to be an anti-seismic monument of engineering structure in history. Structural vibration control technology means to install some special devices, such as Metal Damper, Lock-up Device, Friction damper and Fluid Viscous Damper in structure. These devices can be used to diminish the damage of earthquake or gale on the Engineering structure and to improve the astigmatic capability of a bridge.The research aims at studying the Fluid Viscous Damper, which is usually installed in the middle of the deck of the bridge and the supporting abutment and piers. When the bridge changes normally (such as thermal expansion and slow transformation etc), Fluid Viscous Damper will not have a bad effect on it. While it vibrates violently (such as earthquake, explosion, gales and so on), the Fluid Viscous Damper will move with the structure. The damping medium changes the input energy into heat, and then dissipates it when it flows through the hole in the piston. This can diminish the damage on the structure when the earthquake happens, which greatly improves the capacity of the anti-seismic power of the structure.The paper has analyses the working principles of the Fluid Viscous Damper. The transfer and consumption of energy can be realized by whole shrink energy consumption and viscous energy consumption when the viscous medium flows through holes. Based on the analysis of energy consumption principle, a theoretical formula of double out rod pore type on Fluid Viscous Damper can be made out, providing a theoretical basis for Fluid viscous dampers design. It also analyzes the structure, material and reasons on leakage. The research carries out effective measures on how to prevent the Fluid Viscous Damper from leakage, how to choice the proper material and how to design a proper structure.However, the testing level on the Fluid Viscous Damper can't meet the need because of the limitations of the domestic testing equipment. Based on the fact, the research carries out a method that is to test the functions of the Fluid Viscous Damper through simulated full-scale model testing. The detailed operating processes are as follows. Firstly, build a model in pro/E and put the model into ANSYS ICEN. The goal is to have an accurate model on the Fluid Viscous Damper. Then, transfer the model into ANSYS CFX and analyze it by the method applied on CFD.The paper is mainly about the dynamic testing on Fluid Viscous Damper testing by stimulated model of CFD. By loading different frequencies and amplitude of the sine harmonic load, the curve of the damping force, displacement and speed can be got to analyze the related functions of the Fluid Viscous testing. According to the research, the stimulated method on CFD can be proved to be correct. Therefore, the model can be used to be a way to test the Fluid Viscous Damper, which provides a new verifying means for the design on Viscous Damper.