by S. Hilmy, S. Werner, A. Nisar and J. Masek
Hilmy, S., S. Werner, A. Nisar and J. Masek (1996). Analysis of Strong Motion Records from a Parking Structure During the January 17th Northridge Earthquake. SMIP96
Seminar on Seismological and Engineering Implications of Recent Strong-Motion Data, p. 1 - 18.
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The parking structure studied in this investigation is the first parking structure from which significant strong-motion
data has been obtained during January 17, 1994 Northridge earthquake. Although the structure did not suffer significant
damage, the study of the recorded motions was conducted to evaluate the seismic response of parking structures during
strong ground shaking and the adequacy of the current seismic design provisions for such structures.
An important element of this research project was the use of system identification of the recorded motions in the
parking structure, in order to estimate normal modes of vibration excited in the structure during the Northridge
Earthquake. These normal modes were then used to calibrate a detailed finite element model of the structure which, in
turn, was used to carry out detailed seismic analyses of the structure. The analyses indicated that proper modeling of
all the elements of the parking structure including soil flexibility led to reasonable prediction of the main dynamic
response characteristics of the parking structure. From this, several design recommendations were proposed in this
study to improve the current modeling techniques and the code design provisions of parking structures.