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Ambient Vibration Testing of the Vasco da Gama Bridge, Portugal

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.

 

Below a series of pictures of the bridge are shown. They show it during and after construction:

 

The Vasco da Gama bridge

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

 

The Vasco da Gama bridge

The main span consist of a cable stayed bridge.

 

The Vasco da Gama bridge

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

 

The Vasco da Gama bridge

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

 

The Vasco da Gama bridge

The bridge during construction.

 

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.

 

The Vasco da Gama bridge Modal Analysis

Crystal 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.

 

The Vasco da Gama bridge Modal AnalysisThe Vasco da Gama bridge Modal Analysis

The Vasco da Gama bridge Modal AnalysisThe Vasco da Gama bridge Modal Analysis

The Vasco da Gama bridge Modal AnalysisThe Vasco da Gama bridge Modal Analysis

The Vasco da Gama bridge Modal AnalysisThe Vasco da Gama bridge Modal Analysis

The Vasco da Gama bridge Modal AnalysisThe Vasco da Gama bridge Modal Analysis

 

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.