Preliminary Study Of Dynamic Analysis Of The Indoor Facilities Isolation And Structural Vibration Control System

The isolation floor and energy dissipation system is a new construction systemwhich sets an isolation floor used to withstand the upper load in the traditionalarchitectural structure floor. The original floors and the isolation floors are connectedby isolation and energy dissipation devices, and the effect of structure tuning can beachieved by the quality of upper floor isolation. Moreover, the seismic isolation ofindoor facilities can be done by the isolation floor and the additional dampingprovided by the isolation floor and energy dissipation system can reduce earthquakeresponse of the building. The indoor facilities isolation and energy dissipation systemconsists of the isolation bearing and the damping devices which are installed in theisolation floors. To adjust the parameters of isolating and energy dissipating systemscan able to achieve better damping effect of indoor facilities with the main structures.1. The seismic isolation technology, energy dissipation control, turned massdamper, the protection of secondary system and floor isolation and energy dissipationsystems are introduced briefly in this paper.2. This paper creates the differential equations of motion of the dissipation system.The influence of the transfer function of isolation and dissipation system by adjustingthe indoor facilities damping ratio, mass ratio and the displacement of the isolatedfloor is discussed in this article. And the combination method of pseudo excitation andhigh precise integration scheme is also adopted to study the change law of thestructure displacement and acceleration under the stationary and non-stationaryrandom earthquake excitation.3. The parameters of isolation floor and energy dissipation systems are optimizedin terms of the sum of displacement and velocity performance indicators of the mainstructures and isolation floors. And the optimum indoor facilities for isolation andenergy dissipation system parameters are archived by the GA toolbox. And the timehistory analysis is practiced in order to test the control effect of the dissipationsystem.4. The three-dimensional finite element analysis modal is created by using theSAP2000, the friction pendulum and the viscous damper devices are set in thesystems. Consider the influence of different loading layout and different coefficientsof viscous dampers; enter seven seismic waves to examine the effect of the systems.The random excitation theoretical analysis and finite element model analysisfound that the indoor facilities isolation and energy dissipation system can be betterable to protect the indoor facilities. The system has a damping effect on the mainstructure, select appropriate facilities isolation energy dissipation system parametersand to determine a reasonable structure damping control target is very necessary.Through this study, the main research results obtained are:（1） After setting the indoor facility isolation system，the acceleration of thesystem is significantly reduced, the peak acceleration decreased by48%, the averagevalue of the relative displacement of the floor is9.95cm, it is able to meet the requirements of the indoor use area.（2）The response of the main structure is under controlled, the main buildingstructure peak acceleration fell by an average16%, the peak displacement responsedecreased by20%.（3）Frictionpendulum and applications of viscous dampingcan give full playtothe isolation room amenities isolation system damping effect, end friction pendulumcan provide stiffness and damping and release the freedoms of floors under theearthquake.