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Operational Modal Analysis of the Vasco da Gama Bridge

The results presented here were obtained by performing a re-analysis with ARTeMIS Modal Pro of the database created by Professors Alvaro Cunha and Elsa Caetano (Laboratory of Vibrations and Structural Monitoring of the Faculty of Engineering of the University of Porto, Portugal) during the dynamic tests performed on the Vasco da Gama Bridge at the commissioning stage, under contract with Novaponte ACE
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.

In the table below the modes are presented. The mode 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: 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.


Pictures from the Test

The Vasco da Gama bridge in its full length, seen from northern edge of the Tejo (Tagus) river:

The main span consist of a cable stayed bridge:

The main span seen from the northern edge of the Tejo river:

The main span seen from the southern edge of the Tejo river:

The bridge during construction:





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