Response of Long-Span Bridges to Spatially Varying Ground Motion
Publication: Journal of Structural Engineering
Volume 122, Issue 5
Abstract
Results of stationary and transient response analyses of the Golden Gate suspension bridge, and the New River Gorge and Cold Spring Canyon deck arch bridges, to a general spatially varying earthquake ground motion (SVEGM) model are presented. The results are compared with responses computed using identical and delayed excitations. The use of identical excitations is in general unacceptable for these long-span bridges, and the use of delayed excitations is acceptable only for the longitudinal response of short arch bridges. Surprisingly, the transient lateral displacements of the suspension bridge center span significantly overshoot the corresponding stationary displacements for the filtered Kanai-Tajami excitation power spectrum; this spectrum may therefore be unsuitable for analyzing very flexible structures. The qualitative effects of SVEGM on stationary and transient force responses are found to be similar.
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Information & Authors
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Published In
Journal of Structural Engineering
Volume 122 • Issue 5 • May 1996
Pages: 476 - 484
Copyright
Copyright © 1996 American Society of Civil Engineers.
History
Published online: May 1, 1996
Published in print: May 1996
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