Full-scale Component Testing of Seismic Isolation Devices and Verification of Their Performance in Full-scale System Level Tests on a Shaking Table
Shakhzod Takhirov1, Eric Fujisaki2, Leon Kempner3, Michael Riley4, Brian Low5
1 Engineering Manager of Structures Laboratory, CEE, UC Berkeley
Berkeley, California, USA
takhirov@berkeley.edu
2 Chair of IEEE693 Working Group
e.fujisaki.01@gmail.com
3 Principal Structural Engineer, Bonneville Power Administration
Vancouver, WA 98666
lkempnerjr@bpa.gov
4 Structural Engineer, Bonneville Power Administration
Vancouver, WA 98666
mjriley@bpa.gov
5 Principal Civil Engineer, Pacific Gas and Electric
San Ramon, CA 94583
bslc@pge.com
Abstract. The technology of seismic isolation and other seismic protective devices has evolved quite significantly in the recent years. Nowadays, manufacturers offer a wide variety of such devices that have well-defined properties customizable to almost any practical application. To expand the application of the seismic protective devices to protection of high-voltage substation this study was undertaken. The paper describes results of extensive component testing of seismic protective devices and system level tests of seismically isolated high-voltage equipment conducted at the University of California, Berkeley. The component-testing program followed the requirements of newly developed Annex W that is proposed for inclusion into upcoming version of IEEE693 document. The experimental program of the full-scale systems was mainly focused on moderate-weight and lightweight-equipment tested at the moderate performance level anchored at 0.5g. The tests on fixed base abd isolated base systems clearly demonstrated the benefits of seismic isolation. Based on the results of the system level tests, the isolation reduced demand on the system by a factor close to 2.5.
Keywords: IEEE693, seismic qualification; numerical modeling and time history analysis; seismic isolation; damping device; high-voltage substation equipment.
