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Smart Structures and Systems
  Volume 6, Number 4, May 2010, pages 373-388

Finite element model updating of Komurhan highway bridge based on experimental measurements
Alemdar Bayraktar, Ahmet Can Altunisik, Baris Sevim and Temel Turker

    The updated finite element model of K??han Highway Bridge on the Flrat River located on the 51st km of Elazl-Malatya highway is obtained by using analytical and experimental results. The 2D and 3D finite element model of the bridge is created by using SAP2000 structural analyses software, and the dynamic characteristics of the bridge are determined analytically. The experimental measurements are carried out by Operational Modal Analysis Method under traffic induced vibrations and the dynamic characteristics are obtained experimentally. The vibration data are gathered from the both box girder and the deck of the bridge, separately. Due to the expansion joint in the middle of the bridge, special measurement points are selected when experimental test setups constitute. Measurement duration, frequency span and effective mode number are determined by considering similar studies in literature. The Peak Picking method in the frequency domain is used in the modal identification. At the end of the study, analytical and experimental dynamic characteristic are compared with each other and the finite element model of the bridge is updated by changing some uncertain parameters such as material properties and boundary conditions. Maximum differences between the natural frequencies are reduced from 10% to 2%, and a good agreement is found between natural frequencies and mode shapes after model updating.
Key Words
    ambient vibration; finite element model updating; highway bridge; operational modal analysis; peak picking method.
Alemdar Bayraktar, Ahmet Can Altunisik, Baris Sevim and Temel Turker: Department of Civil Engineering, Karadeniz Technical University, 61080, Trabzon, Turkey

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