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

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Abstract

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.

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Authors and Affiliations

  1. Department of Mechanical and Industrial Engineering, University of Thessaly, Volos, 38334, Greece

    Evaggelos Ntotsios, Ioannis Nikolaou & Costas Papadimitriou

  2. Institute of Engineering Seismology and Earthquake Engineering, P.O. Box 53, 55102, Finikas, Thessaloniki, Greece

    Christos Karakostas, Vasilios Lekidis & Thomas Salonikos

  3. Egnatia Odos S.A., Capital Maintenance Department, 6th km Thessaloniki-Thermi, P.O. Box 30, 57001, Thermi, Greece

    Panagiotis Panetsos

Authors
  1. Evaggelos Ntotsios
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  2. Christos Karakostas
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  3. Vasilios Lekidis
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  4. Panagiotis Panetsos
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  5. Ioannis Nikolaou
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  6. Costas Papadimitriou
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  7. Thomas Salonikos
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Correspondence to Christos Karakostas.

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Ntotsios, E., Karakostas, C., Lekidis, V. et al. Structural identification of Egnatia Odos bridges based on ambient and earthquake induced vibrations. Bull Earthquake Eng 7, 485–501 (2009). https://doi.org/10.1007/s10518-008-9074-5

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  • DOI: https://doi.org/10.1007/s10518-008-9074-5

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