Improvement Analysis Of Long-span Bridges
Flutter: Messina Bridge Example
Author(s)
J. Á. Jurado, A. León, F. Nieto & S. Hernández
Abstract
The hybrid methods used in the aeroelastic analysis of flutter for long-span
bridges are computational, but they use coefficients and functions obtained
experimentally in a wind tunnel. The experimental testings are carried out with a
deck sectional model and there are two types: an aerodynamic testing for
obtaining the aerodynamic coefficients such as drag, lift and moment, and an
aeroelastic testing for obtaining the flutter derivatives, that the model oscillates
under free vibration suspended by springs. In this paper, some improvements
were achieved in the experimental phase as well as in the computational phase of
the method. The influence of variation of the aerodynamic coefficients were
studied with Reynold’s number; different sets of springs were used to include a
wide range of reduced velocities that the flutter derivatives depend on; the
influence of deformation that the static wind load produces at the angle of attack
along the bridge span was studied; finally this angle of attack was taken into
account to determine the flutter derivatives used at each part of the deck. These
improvements were applied to the sectional and computational models of the
future Messina Strait Bridge in Italy.
Keywords: aeroelasticity, long-span bridges, flutter, sectional tests.
1 Introduction
The flutter condition on long-span bridges is critical during the design of these
structures. To avoid experimental tests of completed bridge models in large wind
tunnels that are complicated and expensive, it is necessary to use a hybrid
method which is computational based but needs experimental parameters.
Keywords
aeroelasticity, long-span bridges, flutter, sectional tests.
Related Book
Other papers in this volume
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