Set The Continuous Girder Bridge Seismic Response Of The Viscous Dampers And Strengthening Research

In recent years, due to the frequent occurrence of earthquakes, tsunamis, typhoons and other natural disasters, the people of the world has suffered a great loss of life and property, to improve the overall anti-seismic and wind resistance performance of the existing infrastructure and buildings in civil engineering industry, has become a very important research direction. The bridge is an particularly important integral part of road, rail and urban road network.Damage of bridge caused by the cyclone, earthquake and flood as the main natural disasters of nature, structure, has been causing people more and more attention. For these reasons, many experts and scholars at home and abroad in the field of civil engineering have gradually begun research in this area, rich achievements on basic seismic isolation, energy dissipation and active intelligent vibration control,as the main research contents of the subject, have been achieved. Damper is the most popular method with experts:the most used one is the liquid viscous dampers. After installed on buildings it can work normally for a long time because of its mature technology and stable performance. Worldwide, in the past twenty years, there have been more than400bridges and buildings have been successfully equipped with fluid viscous dampers.Firstly, the mechanics characteristics, internal structure and working principle of viscous dampers are introduced in this paper. Then,the seismic response analysis model and the dynamic equation seismic of the bridge structure with fluid viscous damper are introduced in detail.Using the finite element analysis software,a model of a continuous beam bridge in Gansu Province as the engineering background,is established using the nonlinear dynamic time history analysis method to analyze seismic response, then, comparative analyzing different parameters and layout of damper analyzing dampers used to reinforce the system in practical engineering. The content of this paper can be divided into the following three parts:Firstly, the contents of the protective system, damping and energy distribution sense are explained in this paper introducing the basic theory, structural features, and layout theoretical model, optimize layout and parameters influence of viscous dampers and the seismic calculation method stated of bridges with viscous dampers with a detailed description of the three common methods and derivation calculation.Secondly, the actual engineering background, after setting the viscous damper damping by using different combinations of conditions on the bridge by the seismic wave structure of the pier at the end of their forces and the beam displacement analysis, which come in this article with the actual bridge projects viscous damper optimal damping, vibration analysis and comparison of the effect of the damper settings with or without viscous damper.Finally, seismic retrofitting existing bridges research have been done. Seismic strengthening methods commonly used are discussed listed compared and verified by calculation model analysis of different options to set the damper reinforcement seismic capacity analysis, the superiority of viscous damper reinforcement program.