by S. Rihal
April 1994, 65 pp.
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A study of non-structural damage observed in the instrumented Santa Clara County Government
Center, during the Loma Prieta, California, earthquake of October 17, 1989, has been carried
out, to correlate the recorded CSMIP response data with observed nonstructural component
damage. A methodology is presented to assess the performance and behavior of non-structural
building components during earthquakes. One main objective of this seismic case-study was
to investigate the relationship between seismic response parameters, e.g., peak response
acceleration levels, frequency content and inter-story drift levels and corresponding
nonstructural damage observed during the Loma Prieta earthquake. Significant non-structural
component damage was observed to have occurred particularly at the 7th and 11th floor levels.
Comparison of the observed non-structural damage and peak recorded accelerations at the 7th
floor (0.2579) and at the 12th floor (0.2949) shows the thresholds of response accelerations
that produce non-structural component damage. It is suggested that one factor contributing
to the extensive non-structural damage during the 1989 Loma Prieta earthquake may be the
large number of floor acceleration cycles with amplitudes greater than 0.05 g. A nonstructural
component damage index expressed as a percentage of components damaged is proposed as a means
of characterizing observed non-structural component damage data.