Seismic Response and Damage Detection Analyses of an Instrumented Steel Moment-Framed Building
Publication: Journal of Structural Engineering
Volume 132, Issue 10
Abstract
The seismic performance of steel moment-framed buildings has been of particular interest since brittle fractures were discovered at the beam–column connections in a number of buildings following the M 6.7 Northridge earthquake of January 17, 1994. A case study of the seismic behavior of an extensively instrumented 13-story steel moment frame building located in the greater Los Angeles area of California is described herein. Response studies using frequency domain, joint time–frequency, system identification, and simple damage detection analyses are performed using an extensive strong motion dataset dating from 1971 to the present, supported by engineering drawings and results of postearthquake inspections. These studies show that the building’s response is more complex than would be expected from its highly symmetrical geometry. The response is characterized by low damping in the fundamental mode, larger accelerations in the middle and lower stories than at the roof and base, extended periods of vibration after the cessation of strong input shaking, beating in the response, elliptical particle motion, and significant torsion during strong shaking at the top of the concrete piers which extend from the basement to the second floor. The analyses conducted indicate that the response of the structure was elastic in all recorded earthquakes to date, including Northridge. Also, several simple damage detection methods employed did not indicate any structural damage or connection fractures. The combination of a large, real structure and low instrumentation density precluded the application of many recently proposed advanced damage detection methods in this case study. Overall, however, the findings of this study are consistent with the limited code-compliant postearthquake intrusive inspections conducted after the Northridge earthquake, which found no connection fractures or other structural damage.
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Acknowledgments
The writers gratefully acknowledge the input of the following persons: Chris Stephens and Roy Tam of the USGS National Strong Motion Program Data Center, Ahmet Sanli of Uzun and Case Engineers, Howard Bundock of USGS, Steven Cloke and Michael Cholakian of the Los Angeles County Department of Public Works, Albert Chen of Black and Veatch, Inc., and James Anderson of the University of Southern California.
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Information & Authors
Information
Published In
Journal of Structural Engineering
Volume 132 • Issue 10 • October 2006
Pages: 1543 - 1552
Copyright
© 2006 ASCE.
History
Received: Oct 15, 2004
Accepted: Oct 10, 2005
Published online: Oct 1, 2006
Published in print: Oct 2006
Notes
Note. Associate Editor: Ahmet Emin Aktan
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