Development of Time Histories for Ieee693 Testing/Analysis and Their Validation By Numerical Simulations and Full-Scale Testing of Seismically Isolated Equipment


Abstract eng:
The main objective of the paper is to address current developments for seismic qualification per IEEE Standard 693, Recommended Practice for Seismic Design of Substations. An extensive study conducted in 2003 on a set of strong motions to be used for IEEE 693 seismic qualifications resulted in the development of three-component time histories called TestQke4IEEE. Based on a detailed analysis, the best candidate was selected from a large set of the strong motions available at that time. TestQke4IEEE was developed from a historic record obtained during the 1995 Lander earthquake by matching its spectra in the time domain to the current IEEE693-2005 spectra. For more than a decade, the time histories have been successfully used for seismic qualification testing and analysis. Recent developments (e.g., M9 project for Cascadia subduction zone earthquakes) and records from recent earthquakes (e.g., the 2015 Nepal and the 2010 Chile earthquakes) clearly show a need to re-evaluate the time histories and the spectral demand specified by IEEE693-2005. It was clearly demonstrated that the strong motions in these regions can have long duration and high energy in a low frequency range. To address this issue, a set of strong motions, which is much larger than the one studied earlier, is investigated in the paper. This paper accounts for new time history records from the recent major earthquakes and assesses their effect on the spectral demand specified by IEEE693-2005. As one of the study’s results, a set of time histories closely matching the IEEE693 spectra at 5% damping are developed which can be used for the seismic qualification of substation equipment without and with protection devices. A new annex that provides guidance for the use of seismic protective systems with substation equipment is one of many new changes proposed in the next version of the IEEE693 document. The paper describes the validation approach by means of numerical simulations and full-scale shaking table tests of a substation equipment with seismic isolation and damping devices. It is intended that future users of the new seismic protective systems annex will apply the time histories developed by this study.

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Conference Title:
Conference Title:
16th World Conference on Earthquake Engineering
Conference Venue:
Santiago (CL)
Conference Dates:
2017-01-09 / 2017-01-13
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 Record created 2017-01-18, last modified 2017-01-18


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