Wind and Structures

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Refined optimal passive control of buffeting-induced wind loading of a suspension bridge

  • Domaneschi, M. (Department of Civil and Environmental Engineering, Politecnico di Milano) ;
  • Martinelli, L. (Department of Civil and Environmental Engineering, Politecnico di Milano)
  • Received : 2012.11.24
  • Accepted : 2013.08.19
  • Published : 2014.01.25
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Abstract

Modern design of long suspension bridges must satisfy at the same time spanning very long distances and limiting their response against several external loads, even if of high intensity. Structural Control, with the solutions it provides, can offer a reliable contribution to limit internal forces and deformations in structural elements when extreme events occur. This positive aspect is very interesting when the dimensions of the structure are large. Herein, an updated numerical model of an existing suspension bridge is developed in a commercial finite element work frame, starting from original data. This model is used to reevaluate an optimization procedure for a passive control strategy, already proven effective with a simplified model of the buffeting wind forces. Such optimization procedure, previously implemented with a quasi-steady model of the buffeting excitation, is here reevaluated adopting a more refined version of the wind-structure interaction forces in which wind actions are applied on the towers and the cables considering drag forces only. For the deck a more refined formulation, based on the use of indicial functions, is adopted to reflect coupling with the bridge orientation and motion. It is shown that there is no variation of the previously identified optimal passive configuration.

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