Parametric Analysis of Friction Pendulum System Inter-Story Isolation Structure Based on Benchmark Model

Abstract

Given the limitation that the base isolation technology is easy to overturn and collapse in the application of high-rise structures, and at present, high-rise structures also need an isolation control system that can effectively control the structural response under earthquake to reduce seismic damage. Combined with the advantages of friction pendulum system (FPS) and inter-story isolation technology, the friction pendulum system inter-story isolation technology is proposed and applied to high-rise structures. Based on the 20-story benchmark model, the parametric analysis of the friction pendulum system inter-story isolation structure is carried out. Firstly, based on the theoretical model of friction pendulum system, the structural motion equation of friction pendulum system inter-story isolation structure is proposed and the simulation model of the system is established by MATLAB/Simulink. The effects of slideway radius, friction coefficient, and structural damping ratio on the objective function are studied. The results show that the energy consumption ratio of friction pendulum system decreases with the decrease of mass ratio of superstructure to lower structure. The change of top floor acceleration tends to be smaller at both ends and larger in the middle with the increase of mass ratio. The slideway radius does not affect the frictional energy consumption of the friction pendulum system and the base shear ratio of the structure. With the decrease of damping ratio and friction coefficient, the energy consumption of the structure itself increases.