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Structural behaviour and design criteria of under-deck cable-stayed bridges subjected to seismic action

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Title: Structural behaviour and design criteria of under-deck cable-stayed bridges subjected to seismic action
Authors: Camara, A
Ruiz-Teran, AM
Stafford, PJ
Item Type: Journal Article
Abstract: Under‐deck cable‐stayed bridges are very effective structural systems for which the strong contribution of the stay cables under live loading allows for the design of very slender decks for persistent and transient loading scenarios. Their behaviour when subjected to seismic excitation is investigated herein and a set of design criteria are presented that relate to the type and arrangement of bearings, the number and configuration of struts, and the transverse distribution of stay cables. The nonlinear behaviour of these bridges when subject to both near‐field and far‐field accelerograms has been thoroughly investigated through the use of incremental dynamic analyses. An intensity measure that reflects the pertinent contributions to response when several vibration modes are activated was proposed and is shown to be effective for the analysis of this structural type. The under‐deck cable‐stay system contributes in a very positive manner to reducing the response when the bridges are subject to very strong seismic excitation. For such scenarios, the reduction in the stiffness of the deck because of crack formation, when prestressed concrete decks are used, mobilises the cable system and enhances the overall performance of the system. Sets of natural accelerograms that are compliant with the prescriptions of Eurocode 8 were also applied to propose a set of design criteria for this bridge type in areas prone to earthquakes. Particular attention is given to outlining the optimal strategies for the deployment of bearings.
Editors: Fajfar, P
Chopra, AK
Nakashima, M
Issue Date: 1-May-2013
Date of Acceptance: 3-Aug-2012
URI: http://hdl.handle.net/10044/1/14166
DOI: https://dx.doi.org/10.1002/eqe.2251
ISSN: 0098-8847
Publisher: Wiley
Start Page: 891
End Page: 912
Journal / Book Title: Earthquake Engineering and Structural Dynamics
Volume: 42
Issue: 6
Copyright Statement: © 2012 John Wiley & Sons Ltd. This is the pre-peer reviewed version of the following article: Camara, A. , Ruiz‐Teran, A. M. and Stafford, P. J. (2013), Structural behaviour and design criteria of under‐deck cable‐stayed bridges subjected to seismic action. Earthquake Engng Struct. Dyn., 42: 891-912., which has been published in final form at https://doi.org/10.1002/eqe.2251
Keywords: Science & Technology
Technology
Engineering, Civil
Engineering, Geological
Engineering
under-deck cable-stayed bridges
nonlinear dynamics
Eurocode 8
bridge bearings
seismic response
incremental dynamic analysis
near-field effects
intensity measure
DYNAMIC-ANALYSIS
0905 Civil Engineering
Strategic, Defence & Security Studies
Publication Status: Published
Online Publication Date: 2012-08-31
Appears in Collections:Faculty of Engineering
Civil and Environmental Engineering



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