CSMIP 94-04

"Correlation between Recorded Building Data and Non-Structural Damage during the Loma Prieta Earthquake of October 17, 1989"

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.