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Case Studies: |
Modal Survey of the Vasco da Gama Bridge
The results presented
here were obtained by
performing a re-analysis
with ARTeMIS Extractor
Pro of the database
created by Professors
Álvaro 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
you can download an AVI
movie animating the mode
showed above. The mode
has been estimated with
the Enhanced Frequency
Domain Decomposition
estimator available in
the ARTeMIS Extractor
Handy and ARTeMIS
Extractor Pro versions.
Download AVI movie
Hint: To get the
maximum out of the
downloaded AVI movie,
please set your AVI
movie player to "Repeat
Forever".
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 paper:
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.
The re-analysis made
with ARTeMIS Extractor
is described in the
following paper:
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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