Sliding Isolated Structure Numerical Analysis Of The Energy Transfer

The laws of energy transmission and dissipation of base-isolated plain sliding systems of building structures under ground motions are studied based on Simulink/Matlab in this thesis, main works and results are shown as follows:1 Based on the relative and absolute energy balance equations of sliding structures, Simulink models and Matlab programs calculating and evaluating energy responses are established and some related problems are explained.2 Plain sliding base-isolated systems of building structures under harmonic excitation are researched, the effect of design factors and operational factors of structures on the initial sliding moment of isolation layer is discussed, the discrepancy of relative and absolute input energy is analyzed, the effect of design factors of isolation layer on isolation effectiveness is discussed based on the concept of energy in the end, investigations show that friction coefficients and excitation have a remarkable influence on the initial sliding moment of isolation layer and the discrepancy of relative and absolute input energy, however the discrepancy will diminish gradually with the prolonged duration of earthquake action, the mass and stiffness of isolation layer have a remarkable and intricate influence on the isolation efficiency .3 Structural properties of sliding structures under ground motion are analyzed , the behaviour of damping energy-dissipation of superstructure and isolation layer is studied, the change law of two energy quota system of system under different level of friction coefficient is discussed, relative studies of energy spectrum of sliding structures have been carried out, research indicates that there is a relationship between superstructure's damping energy-dissipation and natural vibration period; the damping energy-dissipation of isolation layer can be ignored because of its smallness; the responses of sliding structures not always reach its maximum on condition that ground motion is strongest, and the friction energy- dissipation of system not always reach its maximum on condition that the friction coefficient is larger; the input energy of system is affected greatly by the mass ratio of isolation layer to superstructure and the natural vibration period of superstructure.