Application Of Friction Pendulum Systems In Seismic Retrofit Of Frame Structures

Friction pendulum bearing is the seismic isolation bearing that possesses excellent performance. Basing on summarizing the abroad and domestic papers and reports about FPS, surrounding the main purpose referred to the structure foundation seismic retrofit of FPB, with the practical engineerings, using with the finite element simulation method, this paper has made a comprehensive study on the energy dissipation isolation structure with FPB from the calculation model to isolation result.The main research contents of this paper are as follows:1The paper has discussed two kinds of analysis models of FPS, including equivalent linear model and nonlinear link element model, where, the nonlinear link element is on the basis of the equivalent linear model.2) The paper has established a three-dimensional seismic isolation structure model of some existed framework structure, to study on the natural vibration characteristic of original structure and seismic isolation structure through modal analysis method. It chose and designed earthquake and parameters of FPBs, for obtaining the original stiffness value and equivalent stiffness value of calculation model through calculating.3) Under the frequent earthquakes, the upper structure adopted linear elastic model, and FPB used nonlinear link element model in the system analysis model. The time history analysis shows that the FPBs have played fine seismic isolation role in interstory displacement angle, absolute acceleration of floor and the reaction of base shear.4) Under the rare earthquakes, the beams and columns of the structure used rod end plastic hinge model, and the FPBs used nonlinear link element model in the system analysis model. The paper counted up and analyzed the situations of plastic hinges in every piece of structure framework. The nonlinear time history analysis shows that the FPBs not only effectively reduces elastic-plastic interstory displacement angle and interstory remnant displacement, but also alleviates the rotation demand of beam column plastic hinges, so that it can mitigate the damage degree of the structure in the earthquakes.