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    Ambient Vibration Testing of the Vasco da Gama Bridge, Portugal

    Ambient Vibration Testing of the Vasco da Gama Bridge, Portugal

    The Vasco da Gama bridge is located near Lisbon and is the second crossing of the Tejo river. Three types of test were done: Ambient vibration test, free vibration test and measurements in the stay cables. The results shown below are based on the ambient vibration test. The equipment used were 6 triaxial GeoSIG seismographs synchronized by a portable PC.

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    The modal analysis has been performed using the Crystal Clear Stochastic Subspace Identification estimator available in the ARTeMIS Modal Pro version. Below a screen dump show the stabilization diagram obtained from one of the Test Setups. In addition, the Modal Assurance Criterion (MAC) between all the modes is shown, and reveal that the mode shapes a orthogonal.

    Ambient Vibration Testing of the Vasco da Gama Bridge, PortugalCrystal Clear Stochastic Subspace Identification of the modes of the bridge.

    Below the modes are presented. The modes has been estimated with default settings of the Crystal Clear Stochastic Subspace Identification estimator available in the ARTeMIS Modal Pro version.

    Related Information

    Laboratory of Vibrations and Structural Monitoring of FEUP VIBEST has their own web site at: www.fe.up.pt/vibest. A detailed description of the test they did can be found in the following papers:

    Cunha Á., Caetano E. and Delgado, R.
    Dynamic Tests on a Large Cable-Stayed Bridge. An Efficient Approach.
    Journal of Bridge Engineering, ASCE, Vol. 6, No.1, pp.54-62, 2001.

    Cunha Á., Caetano E., Brincker R., Andersen P.
    Identification from the Natural Response of Vasco da Gama Bridge
    22nd International Modal Analysis Conference (IMAC), Dearborn, Michigan, 2004.

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    Palle Andersen
    Managing Director, Ph.D.
    Niels Jernes Vej 10
    9220 Aalborg East, Denmark

    Ambient Vibration Testing of the Vasco da Gama Bridge, Portugal

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    Structural Vibration Solutions
    Niels Jernes Vej 10
    9220 Aalborg East, Denmark
    CVR: 3245213456

    Ambient Vibration Testing of the Vasco da Gama Bridge, Portugal