The Earthquake Response And Control Analysis Of Isolation Structure With Piezoelectric Friction Damper

The base isolation is developed fully for its advantage of structure and theory simple and clear, effect notable and so on, so it has become a new tendency of structure anti-earthquake developing. At the same time, piezoelectric materials also become a new center of vibration control research for its outstanding feature. In order to get more well effect and reduce the destructiveness of earthquake, a piezoelectric damper is designed with the feature of piezoelectric materials, and then a new kind of intelligent isolation system is formed using the damper, which the frictional force can be controlled.To illustrate the feasibility and effectiveness of the above system, a series of theory analysis and calculating program is presented in this paper. The following work is done:First, A friction damper is designed which the frictional force can be changed according to the feature of piezoelectric materials and consulting the old experience of designing damper. Based on the constitution of piezoelectric materials, the damp modal of the friction damper is given which is put forward the theory foundation of this damper's using. At the same time, the factor that affects the feature of the damper is analyzed.Secondly, LQR and GPC chose as the control algorithm according to the feature of the damper. The characteristic of these two kinds of algorithm is analyzed and is used in the civil engineering vibration controlling.At last, a new intelligent isolation system combining the above damper with laminated rubber bearing is proposed and is used in a practical example. Then the LQR and GPC chose as the control algorithm. MATLAB program is compiled to conduct time history analysis of super-structure of the structure under the earthquake. The non-isolation structure and passive isolation structure are compared with the above system to demonstrate the effectiveness of this isolation system.Through the above analysis it can be seen that the performance of above new isolation device is excellent, the seismic response of the super-structure is significantly reduced. The drift displacement and floor acceleration of the structure is significantly reduced at the same time; in addition this system is also effective whenever in frequently occurred earthquake or seldomly occurred earthquake for the damping force can be changed of the frictional damper. All the research lay foundations for further theoretical analysis and engineering application of piezoelectric materials using in the civil engineering vibration control.