Recent Developments On Bridge Flutter Stability
Estimation Accounting For Errors In The
Aeroelastic Loading
Author(s)
L. Caracoglia
Abstract
State-space stochastic modeling (Itô-type) is employed in this study to
numerically investigate the relevance of modeling errors in the aeroelastic
loading on the flutter stability of a long-span bridge. The main features of the
numerical model are: (i) linear time-domain representation of aeroelastic load
based on indicial-function formulation, perturbed by a suitable \“parametric
error”; (ii) turbulence-induced buffeting load still retained in the dynamic
equations; (iii) linear bridge response restricted to fundamental bending and
torsional mode of the moving deck and cables. The flutter velocity is determined
by using the definition of second- and third-moment stability of the random
dynamic vector. A simplified bridge model is employed to investigate the
feasibility of the proposed approach. Two numerical algorithms for the solution
of stochastic stability are implemented. The comparison of the results is based on
statistical properties of the random state vector at incipient flutter (initial time),
which includes the \“parametric error” variable.
Keywords: long-span bridges, flutter, modeling errors, stochastic calculus,
moment stability.
1 Introduction
Long-span bridges are large-period and low-damping complex structures,
affected by wind hazards. Accurate assessment of flutter velocity is of relevance
to the bridge designer, since this phenomenon may lead to structural collapse.
Recent studies by the author aim at the development of numerical methods for
Keywords
long-span bridges, flutter, modeling errors, stochastic calculus,
moment stability
Related Book
Other papers in this volume
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