Three Examples Of Flutter Analysis Of
Cable-stayed Bridges
Author(s)
J. Á. Jurado, S. Hernández, F. Nieto & A. Baldomir
Abstract
There are multiple configurations permitted for a cable stayed bridge such as the
number of spans, tower shapes, and cable arrangements. Therefore it is always
important to study the behaviour of these types of structures against strong winds
so that aeroelastic instabilities do not appear. This paper contains detailed
aeroelastic analyses of three cable stayed bridges of very different
configurations. Talavera Bridge over the Tagus River in Spain has only a single
span of 315 m with a single pylon. The bridge has a central stay cable plane that
supports the deck and two skewed planes of rear cables that allow the overall
balance. The project of Miradoiros Bridge over La Coruña estuary in Spain has a
classical configuration with a main span of 658 m and two secondary spans of
270 m each. The bridge has two lateral stay cable planes and an aerodynamic
box girder. Finally, the future cable stayed bridge over the Forth in Scotland is
studied. It has three mono-towers with a symmetrical arrangement resulting in
two 650 m main spans and 325 m side spans. The deck superstructure is a single
cell box girder with the stay cables anchored along the centre, so the bridge has
two corridors. The software that analysed the aeroelastic instabilities of these
bridges has been developed by the School of Civil Engineering at the University
of La Coruña and it is based on hybrid methods. The hybrid methods are
computational, although they need some coefficients and functions which must
be obtained experimentally in an aerodynamic wind tunnel working with a deck
sectional model. These experimental data permit the analysis of the complete
structure considering the fluid-structure interaction between the wind flow and
the deck.
Keywords: aeroelastic analysis, cable stayed bridges, wind tunnel tests, flutter,
modal analysis.
Keywords
aeroelastic analysis, cable stayed bridges, wind tunnel tests, flutter,
modal analysis
Related Book
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