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Title:The Effect of Asynchronous Earthquake Motion on Complex Bridges
Author(s):Burdette, Nicholas J.; Elnashai, Amr S.; Lupoi, Alessio; Sextos, Anastasios G.
Subject(s):MAE Center
Abstract:Based on observed damage patterns from previous earthquakes and a rich history of analytical studies, asynchronous input motion has been identified as a major source of unfavorable response for long span structures, such as bridges. This study is aimed at quantifying the effect of geometric incoherence and wave arrival delay on complex straight and curved bridges using state-of-the-art methodologies and tools. Using fully parameterized computer codes combining expert geotechnical and earthquake structural engineering knowledge, suites of asynchronous accelerograms are produced for use in inelastic dynamic analysis of the bridge model. Two multi-degree-of-freedom (MDOF) analytical models are analyzed using 2,000 unique synthetic accelerograms. Results from this study indicate that response for the 344 meter study structure is amplified significantly by non-synchronous excitation, with displacement amplification factors between 1.6 and 3.4 for all levels of incoherence. This amplification was not constant or easily predicable, demonstrating the importance of inelastic dynamic analysis using asynchronous motion for assessment and design of this class of structure. Additionally, deck stiffness is shown to significantly affect response amplification, through response comparison between the curved and an equivalent straight bridge. Study results are used to suggest an appropriate domain for consideration of asynchronous excitation as well as an efficient methodology for analysis.
Issue Date:2006-12
Publisher:Mid-America Earthquake Center
Citation Info:Burdette, N.J., Elnashai, A.S., Lupoi, A., Sextos, A.G. (2006). “The Effect of Asynchronous Earthquake Motion on Complex Bridges,” Mid-America Earthquake Center, University of Illinois at Urban-Champaign, CD Release 06-03
Series/Report:MAE Center CD Release 06-03
Publication Status:published or submitted for publication
Sponsor:National Science Foundation EEC-9701785
Date Available in IDEALS:2008-08-19

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