Research On Efficiency For Double Slipping-surfaced Fps Seismic Isolating System

Modern isolation technology is rapidly developing. Double slipping-surfaced FPSseismic isolating system is one of the effective isolation technology. Since Zayas putforward to the concept of FPS and preliminary mode in1985, many scholars have comeup with theoretical and experimental research. FPS is widely used in bridges andbuildings. DFPS isolation system raised on the basis of FPS, DFPS consumes earthquakeenergy on the slider by the friction, through the slider rotating and sliding to adaptearthquake, extend the natural cycle of the structure effectively. Therefore, there are twocontrol factors affecting the effect of DFPS isolation system, that is slide radius r andslide friction coefficientμ.The research objectives are seven-storey frame structure, one of which set the DFPSisolation system between the foundation and superstructure. Through actual calculation,the state of motion under seismic action has been studied. According to Lagrangeequation, motion equations of the DFPS isolation system structure and none isolationsystem structure were established. The state of motion in the ground motion was solvedbased on the Runge-Kutta method and the MATLAB software. By comparing maximuminter-storey drifts, maximum storey drifts, maximum storey velocities and maximumstorey accelerations of the two situations, the optimal combination of control factorswhen the DFPS isolation system gets the best isolation effect.Through calculation and comparison, the following conclusions are obtained.Maximum storey drifts, maximum inter-storey drifts, maximum storey velocities andmaximum storey accelerations are significantly reduced, which means DFPS isolationsystem has a good isolation effect, slide radius played a small role in DFPS isolationsystem, the influence of the friction coefficient is larger, when the friction coefficientbetween0.01~0.15, the effect of DFPS isolation is better.