The influence of cable-deck interaction on the seismic response of cable-stayed bridges

John H. G. Macdonald, Christos Georgakis

Research output: Chapter in Book/Report/Conference proceedingArticle in proceedingsResearchpeer-review

Abstract

The natural frequencies of deck and local cable vibrations of cable-stayed bridges are in the same range, leading to the possibility of dynamic cable-deck interaction, while cables themselves exhibit significant geometric non-linearities. Bridge analyses often consider global bridge vibrations and local cable vibrations separately, ignoring any interaction, while previous studies of cable-deck interaction have often overlooked important aspects of the behaviour such as the influence of the cable on the deck, realistic levels of loading or the distribution of damping. In this paper, the influence of cable-deck interaction on the seismic response of cable-stayed bridges is examined in greater detail by considering the response of a simplified non-linear cable-deck model to earthquake loading. Responses from non-linear time-history analyses are compared with those from a linear analysis and from two other models considering the global and local cable vibrations separately. Significant interaction is apparent, including ‘parametric’ excitation of the cable due to end displacement at twice its natural frequency. However, this effect takes a long time to develop, and of greater relevance to earthquake loading is the converse non-linear effect of the cable on the deck. Also, greater dynamic cable tensions are caused by local cable vibrations than by global bridge vibrations, but the interaction appears to cause a slight reduction in the maximum total tension.
Keyword: cable-stayed bridges, cable dynamics, cable-deck interaction, geometric non-linearities, parametric excitation, seismic excitation
Original languageEnglish
Title of host publicationThe Twelfth European Conference on Earthquake Engineering
Number of pages6000
Place of PublicationLondon
PublisherElsevier
Publication date2002
ISBN (Print)978-0-08-044049-1
Publication statusPublished - 2002
Externally publishedYes
Event12th European Conference on Earthquake Engineering - London, United Kingdom
Duration: 1 Jan 2002 → …

Conference

Conference12th European Conference on Earthquake Engineering
CityLondon, United Kingdom
Period01/01/2002 → …

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