Abstract
On-site investigation has revealed that substation equipments are very vulnerable to severe earthquakes. Base isolation is one of the effective ways to improve their seismic performance. In previous studies, the isolation bearings were usually simplified as a equivalent linear spring. In this paper, the bilinear hysteretic model has been adopted for bearings which can simulate the variation of the stiffness with displacement. FEM model of the Ultra-High Voltage (UHV) capacitor structures installed with lead rubber bearing was established by using ANSYS. Parametric studies on seismic performance of UHV capacitor structures with various lead rubber bearings were carried out by dynamic time history analysis. Displacement response and porcelain root bending stress were compared and analysed to explore the effect of critical design parameters (such as post-yielding stiffness and characteristic strength) on damping effect. Suggestions on the design of base isolation design for UHV electrical equipment are proposed.
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