Structural identification of Egnatia Odos bridges based on ambient and earthquake induced vibrations |
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| Authors: | Evaggelos Ntotsios Christos Karakostas Vasilios Lekidis Panagiotis Panetsos Ioannis Nikolaou Costas Papadimitriou Thomas Salonikos |
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| Institution: | (1) Department of Mechanical and Industrial Engineering, University of Thessaly, Volos, 38334, Greece;(2) Institute of Engineering Seismology and Earthquake Engineering, P.O. Box 53, 55102 Finikas, Thessaloniki, Greece;(3) Egnatia Odos S.A., Capital Maintenance Department, 6th km Thessaloniki-Thermi, P.O. Box 30, 57001 Thermi, Greece |
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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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| Keywords: | Modal identification Model updating Ambient vibrations Earthquake excitations Bridges |
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