Structural identification of Egnatia Odos bridges based on ambient and earthquake induced vibrations

The dynamic characteristics of two representative R/C bridges on Egnatia Odos motorway in Greece are estimated based on low amplitude ambient and earthquake-induced vibrations. The present work outlines the instrumentation details, algorithms for computing modal characteristics (modal frequencies, d...

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Bibliographic Details
Published in:Bulletin of earthquake engineering 2009-05, Vol.7 (2), p.485-501
Main Authors: Ntotsios, Evaggelos, Karakostas, Christos, Lekidis, Vasilios, Panetsos, Panagiotis, Nikolaou, Ioannis, Papadimitriou, Costas, Salonikos, Thomas
Format: Article
Language:English
Subjects:
Bridges
Civil Engineering
Earth and Environmental Science
Earth Sciences
Earthquakes
Environmental Engineering/Biotechnology
Geophysics/Geodesy
Geotechnical Engineering & Applied Earth Sciences
Hydrogeology
Instrumentation
Original Research Paper
Piers
Seismic activity
Seismic engineering
Structural engineering
Structural Geology
Vibration analysis
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Summary:The dynamic characteristics of two representative R/C bridges on Egnatia Odos motorway in Greece are estimated based on low amplitude ambient and earthquake-induced vibrations. The present work outlines the instrumentation details, algorithms for computing modal characteristics (modal frequencies, damping ratios and modeshapes), modal-based finite element model (FEM) updating methods for estimating structural parameters, and numerical results for the modal and structural dynamic characteristics of the two bridges based on ambient and earthquake induced vibrations. Transverse, bending and longitudinal modes are reliably identified and stiffness-related properties of the piers, deck and elastomeric bearings of the FEMs of the two bridges are estimated. Results provide qualitative and quantitative information on the dynamic behavior of the bridge systems and their components under low-amplitude vibrations. Modeling assumptions are discussed based on the differences in the characteristics identified from ambient and earthquake vibration measurements. The sources of the differences observed between the identified modal and structural characteristics of the bridges and those predicted by FEMs used for design are investigated and properly justified.
ISSN:1570-761X
1573-1456
DOI:10.1007/s10518-008-9074-5