Damage to Cable‐Stayed Bridge during 1988 Saguenay Earthquake. II: Dynamic Analysis
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VIEW THE ORIGINAL ARTICLEPublication: Journal of Structural Engineering
Volume 119, Issue 5
Abstract
The November 25, 1988, Saguenay earthquake is the largest seismic event recorded in eastern Canada. The cable‐stayed Shipshaw bridge, which crosses the Saguenay river near Jonquière, Québec, suffered significant structural damage during the earthquake. One of four anchorage plates connecting the steel box girders to one abutment failed, apparently due to the ground shaking. This paper is the second of two companion papers describing the circumstances of the failure. This paper deals with the dynamic analyses and testing of the bridge that were performed to confirm the cause of failure. Free‐vibration analyses were undertaken to determine the natural frequencies and mode shapes of the bridge. These results were verified by field vibration measurements. A nonlinear dynamic model of the contact friction at the tie‐rod assembly was derived. The model was incorporated in nonlinear time‐step dynamic analyses using horizontal and vertical accelerograms recorded near the site. The results of these analyses confirm the hypothesis that the Saguenay earthquake was the direct cause of failure.
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Published In
Journal of Structural Engineering
Volume 119 • Issue 5 • May 1993
Pages: 1450 - 1463
Copyright
Copyright © 1993 American Society of Civil Engineers.
History
Received: Oct 5, 1992
Published online: May 1, 1993
Published in print: May 1993
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