Optimum Design of Resilient Sliding Isolation System for Seismic Protection of Equipments |
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| Authors: | Hirokazu Iemura Touraj Taghikhany Sarvesh K Jain |
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| Institution: | (1) Department of Civil Engineering Systems, Kyoto University, Kyoto, Japan;(2) Department of Civil Engineering, Amirkabir University, Tehran, Iran;(3) Department of Civil Engineering, Madhav Institute of Technology and Science, Gwalior, India |
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| Abstract: | Seismic isolation is one of the effective methods to protect equipments. It helps to keep seismic response accelerations in
equipment below its allowable limits. Among different types of isolation systems, the combination of restoring spring and
slider, also called as resilient sliding isolation (RSI) system, is the one which has been effectively used for protection
of equipment. Principal design parameters for this type of isolation system are period of system (stiffness of spring) and
friction coefficient of slider. There may be number of combinations of these design parameters which can enable the isolated
equipment to remain functional during and after the predicted seismic event. The optimum design of RSI system can be considered
as the one which maintains the response acceleration in the equipment below its allowable limit and at the same time keeps
the relative displacement between floor and the equipment to the minimum. This study deals with optimum design of resilient
sliding system. First the RSI system is modeled analytically by (i) precise and (ii) simplified SDOF models. The accuracy
of the model is then validated by shaking table tests. The validated simplified SDOF model is then used to determine optimum
design parameters for different levels of allowable accelerations. Results show that the optimum period decreases and the
optimum friction coefficient increases with higher allowable acceleration. |
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| Keywords: | Equipment Seismic isolation Resilient sliding system Optimum design Shake-table test |
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