Improvement of the polyurethane spring isolation device for HV post insulators and its evaluation by fragility curves

Tansu Gökçe, Engin Orakdöğen, Ercan Yüksel*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

8 Citations (Scopus)

Abstract

A novel seismic base isolation system has been developed for high-voltage (HV) porcelain post insulators. The seismic isolation device consists of two steel plates, four polyurethane springs, and a steel rod, which are low-cost components compared to the post insulators. Two alternative designs of the device are experimentally and numerically assessed in this article. A simple and robust numerical model consisting of linear line elements and nonlinear springs was generated, and subsequently validated using the experimental results. Incremental dynamic analyses (IDAs) were then performed to obtain fragility curves. Ten historical earthquake profiles, scaled to intensities between 0.1 and 2.0 g, were then applied to the numerical models. The fragility curves, generated according to the latest version of IEEE-693, demonstrate that the seismic isolation devices are highly effective in diminishing the base moment of the porcelain insulator. It should be noted that relatively large displacements at the top of the pole must be accounted for by ensuring adequate slackness in the flexible conductors.

Original languageEnglish
Pages (from-to)1677-1697
Number of pages21
JournalEarthquake Spectra
Volume37
Issue number3
DOIs
Publication statusPublished - Aug 2021

Bibliographical note

Publisher Copyright:
© The Author(s) 2021.

Funding

The author(s) disclosed receipt of the following financial support for the research, authorship, and/or publication of this article: The first author was sponsored by Bideb 2211 Program of Scientific and Technological Research Council of Turkey (TUBITAK). The study was sponsored by the research funds of Istanbul Technical University (ITU BAP 39552).

FundersFunder number
Bideb 2211 Program of Scientific and Technological Research Council of Turkey
TUBITAK
International Technological University
Istanbul Teknik ÜniversitesiBAP 39552

    Keywords

    • Earthquake safety
    • fragility curve
    • polyurethane spring
    • post insulator
    • seismic isolation

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