Preliminary Processing of the Lotung LSST Data.
Preliminary Processing of the Lotung LSST Data.
(1863 K)
Glaser, S. D.; Leeds, A. L.
NIST GCR 96-690; 57 p. March 1996.
Sponsor:
National Institute of Standards and Technology,
Gaithersburg, MD
Available from:
National Technical Information Service
Order number: PB96-165972
Keywords:
signals; data processing; earthquakes; clay; sand
Abstract:
Possibly the best set of data for earthquake excitation
of soils exists for the test site operated by the
Electric Power Research Institute (EPRI) and the Taiwan
Power Company at Lotung, Taiwan. At this site, two
locations are instrumented with three-component
accelerometers at depths of 47, 17, 11, 6 meters, and at
the surface. One array is in the free-field while the
other is adjacent to a one-quarter scale nuclear
containment vessel. The site is also well instrumented
with piezometers at various depths and locations. The
simplified soil profile consists of 30 to 35 m of silty
sand and sandy silt with some gravel, overlaying a thick
clay and silt deposit. The water table is within half a
meter of the ground surface. This area is seismically
active, and strong shaking generated by many earthquakes
exhibiting a wide range of magnitudes have been recorded
since 1986. This report summarizes the data and signal
processing that was done to the EPRI Lotung data at the
Colorado School of Mines. The over 2000 files were
organized into MATLAB experiments by event. The
provided acceleration data were carefully doubled
integrated to yield velocity and displacement time
history records. The data are now in proper format to
begin system identification analysis.
Building and Fire Research Laboratory
National Institute of Standards and Technology
Gaithersburg, MD 20899