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Floor response spectra in isolated structures subjected to earthquakes weaker than the design earthquake. Part II, Isolation with magnetically controlled elastomeric bearings
Isaković, Tatjana ; Zevnik, Jaka, 1977- ; Fischinger, Matej
The stiffness of rubber bearings typically increases during weak earthquakes. This can reduce the efficiency of the isolation and jeopardize the equipment installed in structures isolated with such ...bearings. The problems and the parameters influencing the response of the equipment in structures isolated by high-damping rubber bearings (HDRB) have been systematically analyzed in the accompanying article. To improve the response of rubber isolators in the case of lower seismic intensities, a new isolation device, which adjusts itself to the intensity of the load, has been developed. It is made from a magnetically controlled elastomer (MCE), i.e. a rubber-like material whose stiffness can be varied by applying a magnetic field. The main topic of this research is the evaluation of the efficiency of this new device. In order to be able to test it, appropriate numerical models of the device and the control algorithm have been developed. The efficiency of the new MCE device for the protection of equipment subjected to weak earthquakes has been systematically studied using non-linear acceleration floor spectra. It was found that the majority of the parameters influencing the response in structures isolated by conventional HDRB also influence the effectiveness of the new device. Besides these parameters, the effectiveness of the new MCE was found to be heavily dependent on the stiffness of the superstructure and on the thresholds of the control algorithm of the device. The MCE is more effective in the protection of equipment installed in very stiff structures.
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