Wind and Structures

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A parametric study of indicial function models in bridge deck aeroelasticity

  • Borri, C. (CRIACIV, Dipartimento di Ingegneria Civile, Universita degli Studi di Firenze) ;
  • Costa, C. (CRIACIV, Dipartimento di Ingegneria Civile, Universita degli Studi di Firenze)
  • Received : 2003.10.31
  • Accepted : 2004.08.30
  • Published : 2004.12.25
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Abstract

In common approaches, bridge dynamics under wind action is analyzed by modeling the interaction between fluid and structure by means of transient wind loads acting over the structure itself. Amid various possible manners to describe such types of loads, a representation based on families of 'indicial functions' is adopted here. The aim is to investigate its flexibility to capture the main features of wind-bridge interaction. A set of coefficients is involved in indicial functions. The values that one may attribute to them suffer uncertainties coming from experimental errors affecting data. Here, the sensitivity of a 2-DOF schematic model to the variations of these coefficients is investigated at fixed values of dynamic derivatives and for various types of indicial functions. It is shown how parameter variations influence phase portraits.

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References

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