The Experimental Research Of Shaking Table On Earthquake Simulation Of Intelligent Base-isolation Structure

The basic isolation technique is one of the efficient ways to withstand and resist the effect of an earthquake. By putting an isolation layer between the basis and the upper structure, it can reduce the transfer of the earthquake energy to the upper structure, so, the upper structure and the internal establishment could be protected efficiently in strong shocks.However, one problem with the normal isolation technique is that it enlarges the drift of the isolation layer when it reduces the response of the main structure to the earthquake, especially near the epicenter, the large velocity of the impulse which is the character of the ground motion will engender a larger drift for the isolation layer.The blend controlling algorithm was developed to make the rubber isolation more practicable, that is, adding the semi-active or passive control component to the normal basic isolation system, then, using the modern controlling theory to control the response of the structure simultaneously. The results show that application of blend isolation can improve not only the applicability of basic isolation system but also the isolation effect.Magnetorhelolgical (MR) fluid dampers, one of the semi-active control devices, have been developed recently. It is the most promising device because of its low power requirement. In this paper, the characters and properties of MR intelligent material and damper were introduced, and the merits and demerits of mechanics model of some primary MR dampers were introduced in detail.A new multi-layer ferroconcrete frame model was designed and made, and a simplified mechanics model was also built in this work. Five types structures were simulated, that is, the original structure, the ordinary basic isolation with rubber isolation pad, attached with MR dampers under passive-off, passive-on and semi-active controlling, respectively. Three simulated analysis modules were built by the use of the fuzzy semi-active controlling algorithm, the three modules were time course, fuzzy controlling and semi-active controlling Simulink simulated analysis, respectively.To investigate the effect of the semi-active controlling, a series of earthquake vibration platform experiments on horizontal earthquake function were carried our, and the kinetic characters and responses of the original and controlled structures were measured. The results show that using of the rubber pad can significantly reduce the acceleration and the inter-story drift, however, the drift of the isolation layer is excessive and this affect the safety of the structure. The performance of MR intellectual base-isolation system which is a safe and practiced device, is better than that of passive isolation device. The controlling effect under fuzzy intelligent controlling algorism is better than that of the passive-off, passive-on and passiveisolation controlling algorithm. Comparing the simulation results and experimental results, the validity of simulation method and the fuzzy intelligent controlling algorithm can also be proved.