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UNIVERSITY OF SOUTHERN CALIFORNIA
Department of Civil Engineering
IMPULSE RESPONSE ANALYSIS OF THE VAN NUYS 7-STORY HOTEL DURING 11
EARTHQUAKES (1971-1994): ONE-DIMENSIONAL WAVE PROPAGATION AND
INFERENCES ON GLOBAL AND LOCAL REDUCTION OF STIFFNESS DUE TO
EARTHQUAKE DAMAGE
by
Maria I. Todorovska and Mihailo D. Trifunac
Report CE 06-01
July, 2006
Los Angeles, California
www.usc.edu/dept/civil_eng/Earthquake_eng/
Object Description
| Title | Impulse response analysis of the Van Nuys 7-story hotel during 11 earthquakes (1971-1994): one-dimensional wave propagation and inferences on global and local reduction of stiffness due to earthquake damage, 2006 |
| Title (alternate) | Civil Engineering Technical Report Series - Strong Motion Group Contributions CE 06-01 |
| Type of alternate title | series |
| Description | The Van Nuys 7-story hotel, located in the Los Angeles metropolitan area, is a rare example of an instrumented reinforced concrete building that has been damaged by earthquakes. It was damaged by two earthquakes -- 1971 San Fernando, and 1994 Northridge, both of which were recorded in the building. In addition, strong motion data of other 10 earthquakes, which occurred over a 24 year period (1971-1994), are available. These recordings are invaluable for validation of structural health monitoring methods. In this report we present an analysis for one such method, and using the EW response of this building during 11 earthquakes.; Wave travel times of vertically propagating waves are measured from plots of impulse response functions computed by deconvolution of the recorded earthquake response. The changes in wave travel times are used to infer the local (between sensors) and global changes of structural stiffness, from one event to another, and with time during the earthquakes that damaged the building (San Fernando and Northridge). The measured wave travel times are also used to estimate the fundamental fixed-base frequency of the building, f sub 1. These estimates of f sub 1 are compared with independent estimates of the soil-structure system frequency f sub sys during the same earthquakes and during five ambient vibration tests, and are all found to be mutually consistent. For this building, f sub 1 during strong longitudinal (EW) motion changed between 1.35 Hz (at the beginning of the San Fernando earthquake) and 0.66 Hz (during the intervals of strongest shaking by the Northridge earthquake).; For three of the earthquakes, which produced the largest response (1971 San Fernando, 1994 Northridge, and 1992 Landers), the analysis is conducted for several time intervals, and changes in stiffness are detected relative to the initial time interval. The analysis shows that monitoring only the changes of f sub sys can be misleading for structural health monitoring and can lead to erroneous alarms, while monitoring changes of f sub 1 over suitably chosen time windows (before, during, and after excitation by strong earthquake motions) can be a powerful and robust tool for structural health monitoring. It is concluded that, under favorable conditions, this method can be used as a tool for structural health monitoring, provided the threshold changes in the system properties have been properly calibrated in terms of actually observed damage. |
| Subject (lcsh) |
Earthquake engineering Structural dynamics Structural engineering Buildings -- Earthquake effects Earthquake hazard analysis |
| Keyword | Earthquake response; Damage Detection; Structural health monitoring; wave propagation times; Impulse response function; Van Nuys hotel |
| Geographic subject (city or populated place) | Van Nuys |
| Geographic subject (state) | California |
| Geographic subject (country) | USA |
| Coverage date | circa 1971/1994 |
| Author |
Todorovska, Maria I. Trifunac, Mihailo D. (Mihailo Dimitrije) |
| Contributor | USC Viterbi School of Engineering |
| Publisher (of the digital version) | University of Southern California. Libraries |
| Date created | 2006-07 |
| Date issued | 2006-07 |
| Type |
texts images |
| Format (aat) | technical reports |
| Format (imt) | application/pdf |
| Language | English |
| Legacy record ID | uscfac-m36 |
| Part of collection | University of Southern California Faculty Research and Publications |
| Series | Civil Engineering Technical Report Series - Strong Motion Group Contributions |
| Rights | Earthquake Engineering – Strong Motion Research Group, Civil Engineering Department, Viterbi School of Engineering, University of Southern California, Los Angeles, CA 90089-2531; Tel. (213) 740-0603, fax (213) 744-1426; http://www.usc.edu/dept/civil_eng/Earthquake_eng/ |
| Repository name | Libraries, University of Southern California |
| Repository address | University of Southern California Digital Library, USC Libraries, 3550 Trousdale Parkway, University Park Campus, Los Angeles, CA 90089-0185 |
| Filename | uscfac-CE06-01 |
| Archival file | uscfac_Volume6/uscfac-CE06-01.pdf |
Description
| Title | Page 1 |
| Full text | UNIVERSITY OF SOUTHERN CALIFORNIA Department of Civil Engineering IMPULSE RESPONSE ANALYSIS OF THE VAN NUYS 7-STORY HOTEL DURING 11 EARTHQUAKES (1971-1994): ONE-DIMENSIONAL WAVE PROPAGATION AND INFERENCES ON GLOBAL AND LOCAL REDUCTION OF STIFFNESS DUE TO EARTHQUAKE DAMAGE by Maria I. Todorovska and Mihailo D. Trifunac Report CE 06-01 July, 2006 Los Angeles, California www.usc.edu/dept/civil_eng/Earthquake_eng/ |
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