Application Of Displacement Dependent Friction Damper In Base Isolated Structure

At present in the seismic base isolated technology in architecture has been the development of more mature, and the corresponding standards and norms are marked in isolation technology practical stage, however, most of researches focus on the conventional seismic records, on the near fault earthquake records of the base isolation is less, consider the blank displacement related friction damper used in rubber structure, a friction dampers model, through theoretical and numerical calculation, the seismic performance of the isolated structure installed in different types of friction dampers inder earthquake. The main contents of this paper are the following three aspects.(1)This paper proposes a new displacement friction damper model, and establish the mechanical model of the damper, and rubber bearings using Bouc-Wen differential hysteretic classical model, according to the mechanical model of isolation bearings and dampers, establishes the dynamic equations of a two degree of freedom system, then use the harmonic balance method to calculate the equation analytical solutions in sine wave loads, Runge-Kutta method and classical calculate the numerical solution of the equation, through the numerical solution to verify the correctness of the analytical solution. The three parameter is also investigated friction damper(initial compression, spring stiffness, slope angel)changes, the analytical solution of the equation and the numerical solution of the influence of the match result. Finally, using Runge-Kutta method to calculate the response of the structure installed in a conventional friction damper isolation structure under strong earthquake records.(2)To a five layer frame installed isolation layer shear type as an example, set up the dynamic equation of isolation structure with friction damper, and then select the appropriate seismic wave records(conventional seismic wave, synthetic near fault pulse near fault pulse type of seismic wave, the actual impact type seismic wave), artificial seismic wave simulation method is based on conventional seismic wave as the bottom wave superposition, and then Dicleili the equivalent pulse and wave motion. Finally, study the non isolated structure installed in all kinds of friction dampers under earthquake seismic response, the control effect of seismic response of the structure after installing friction dampers analysis, numerical results that installed friction damper isolation structure to control the seismic displacement response of the good.(3)To a still installed five layer frame isolation layer as an example, the establishment of dynamic equation of frame structure. The difference between the curves of conventional seismic wave and seismic wave respectively. The effect of near earthquake energy, studied in conventional seismic wave and the real near fault earthquake, there is no isolated structure, installed in all kinds of friction dampers under earthquake energy curve, the results show, no installation of friction when the damper, almost all the earthquake input energy is consumed by rubber bearings, and after the installation of the friction damper, earthquake input energy is composed of bearing and friction damper jointly sonsumed, and from the side show the friction damper control displacement of the isolation structure in response to the good.