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Nonlinear Computer Model for the Simulation of Lock‐in Vibration on Long‐Span Bridges
Author(s) -
Caracoglia Luca,
Noè Salvatore,
Sepe Vincenzo
Publication year - 2009
Publication title -
computer‐aided civil and infrastructure engineering
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.773
H-Index - 82
eISSN - 1467-8667
pISSN - 1093-9687
DOI - 10.1111/j.1467-8667.2008.00576.x
Subject(s) - vortex shedding , aeroelasticity , vibration , structural engineering , nonlinear system , wind tunnel , span (engineering) , deck , engineering , vortex induced vibration , computer simulation , finite element method , vortex , mechanics , aerodynamics , physics , simulation , acoustics , turbulence , aerospace engineering , quantum mechanics , reynolds number
The susceptibility of modern bridges to vortex‐shedding‐induced vibration is a major concern for researchers and designers. The relevance of this phenomenon is associated with the onset of large‐amplitude aeroelastic vibration at moderate wind‐velocity regimes due to synchronization, that is, lock‐in, of the vortex‐shedding frequencies with those corresponding to the natural modes of the structure. Recent observations, either recorded during the monitoring of full‐scale bridges or during experimental tests of deck models in wind tunnels, confirm the importance of these aspects during the operational life of the structure. In this article, a computer model for the simulation of the aeroelastic loading associated with vortex shedding in lock‐in regime is presented, for a direct application to dynamic analysis of long‐span bridges. This approach is based on earlier work focused on the response of slender vertical cylindrical chimneys to vortex‐shedding excitation, which is here extended to noncircular cross sections. The numerical model was employed in conjunction with a finite‐element code for time‐domain nonlinear simulation of the structural dynamic response. The validation of the procedure is performed through numerical simulation, conducted on two specific bridge examples.