Suggested Changes To The Non-conservative Low
Frequency Criteria For The Seismic Design
Spectrum Used In Intraplate Regions
Author(s)
J. M. Nichols
Abstract
The shape and the amplitude of the design spectrum are critical to the safe design
of structures. This paper presents suggested changes to the shape constraints for
the design spectrum in the 0.5 to 3 Hz range for large intraplate earthquakes. The
main recommendation arises because of the impact on a large pulse loading
within an intraplate earthquake with a frequency of 1 to 2 Hertz. Newmark and
Hall in 1978 established the seismic criteria for the design of nuclear power
plants. This criteria still forms an integral part of the legal framework in the
United States for the design of nuclear facilities. The earthquake spectrum
developed for the nuclear power plant design was based on an extensive analysis
of the seismicity of interplate regions and a rigorous mathematical review of the
wave and pulse constraints on the limits of the design spectrum. The shape of the
0.5 to 3 Hertz region of this design spectrum was based on a number of
mathematical assumptions in the analysis that were known in 1978 to be non-conservative
and requiring review with the collection of additional seismic
traces. Recent earthquake data from the secret Russian database held in the
Lamont Doherty Observatory database, data from the New Madrid Seismic
Zone, other large intraplate events and the recent 2004 Sumatra earthquake
provides sufficient data to reconsider the wave and pulse constraints used by
Newmark and Hall in the original mathematical review of the design spectrum.
The recommendations about the spectrum shape change for major intraplate are
applicable to other major structures with a low natural frequency.
Keywords: intraplate earthquakes, nuclear power plants, design spectrum.
Keywords
intraplate earthquakes, nuclear power plants, design spectrum.
Related Book
Other papers in this volume
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