Bulletin of Earthquake Engineering

, Volume 17, Issue 3, pp 1739–1762 | Cite as

Seismic performance enhancement of high-voltage post insulators by a polyurethane spring isolation device

  • Tansu Gökçe
  • Ercan YükselEmail author
  • Engin Orakdöğen
Original Research


High-voltage (HV) post insulators are vulnerable components of the electrical substations during strong earthquakes. It is rather hard to repair them in service. There are two controversial approaches to increase their seismic safety. They are application of the base stiffening techniques and utilization of the base isolation systems. A new low-cost seismic isolation device that is mounted underneath of HV post insulator is being proposed here to provide period elongation and supplementary damping. The seismic isolator consists of two steel plates, four polyurethane springs and a steel rod. Its cost is insignificant compared with price of HV post insulator. Quasi-static and shake table tests were performed on fixed base and isolated specimens. A set of historical acceleration records selected according to IEEE-693 were utilized in the dynamic tests. The supplementary damping provided by the isolation system was determined between 4 and 8%. The accelerations as well as base shear and base moment of HV post insulator were reduced about 20–70% thanks to the isolation system. The generated numerical models reproduced the experimental results. Consequently, the isolation system is capable to enhance the seismic safety of HV post insulators.


Earthquake safety Seismic isolation Low-cost isolation Post insulator Polyurethane spring 



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). 550 kV HV post insulators were supplied by Güral Electric Company. The study was carried out in the Structural and Earthquake Engineering Laboratory (STEELab) of ITU. All supports are gratefully acknowledged.


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Copyright information

© Springer Nature B.V. 2018

Authors and Affiliations

  1. 1.Institute for Science and TechnologyIstanbul Technical UniversityMaslak, IstanbulTurkey
  2. 2.Faculty of Civil EngineeringIstanbul Technical UniversityMaslak, IstanbulTurkey

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