Bulletin of the Seismological Society of America
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Bulletin of the Seismological Society of America; August 2007; v. 97; no. 4; p. 1334-1345; DOI: 10.1785/0120060148
© 2007 Seismological Society of America
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Propagating Waves in the Steel, Moment-Frame Factor Building Recorded during Earthquakes

Monica D. Kohler1, Thomas H. Heaton2 and Samuel C. Bradford3

1 Center for Embedded Networked Sensing
University of California, Los Angeles
Los Angeles, California 90095-1596
 (M.D.K.)
2 Department of Civil Engineering
California Institute of Technology
Pasadena, California 91125
 (T.H.H.)
3 Jet Propulsion Laboratory
4800 Oak Grove Drive, 299-101
Pasadena, California 91109-8099
 (S.C.B.)

Wave-propagation effects can be useful in determining the system identification of buildings such as the densely instrumented University of California, Los Angeles, Factor building. Waveform data from the 72-channel array in the 17-story moment-resisting steel frame Factor building are used in comparison with finite- element calculations for predictive behavior. The high dynamic range of the 24-bit digitizers allows both strong motions and ambient vibrations to be recorded with reasonable signal-to-noise ratios. A three-dimensional model of the Factor building has been developed based on structural drawings. Observed displacements for 20 small and moderate, local and regional earthquakes were used to compute the impulse response functions of the building by deconvolving the subbasement records as representative input motions at its base. The impulse response functions were then stacked to bring out wave-propagation effects more clearly. The stacked data are used as input into theoretical dynamic analysis simulations of the building’s response.






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