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Preventing the wind-induced vibration of arches during construction

 Preventing the wind-induced vibration of arches during construction
Auteur(s): , , , ,
Présenté pendant IABSE Congress: Resilient technologies for sustainable infrastructure, Christchurch, New Zealand, 3-5 February 2021, publié dans , pp. 311-318
DOI: 10.2749/christchurch.2021.0311
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Arches are the most prominent architectural feature of tied-arch bridges and offer a dramatic visual impact. Arches rarely exhibit aerodynamic instabilities once tied to the bridge deck; however, d...
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Détails bibliographiques

Auteur(s): (RWDI, Inc., Guelph, Ontario, Canada)
(RWDI, Inc., Guelph, Ontario, Canada)
(RWDI, Inc., Guelph, Ontario, Canada)
(RWDI, Inc., Guelph, Ontario, Canada)
(RWDI, Inc., Ottawa, Ontario, Canada)
Médium: papier de conférence
Langue(s): anglais
Conférence: IABSE Congress: Resilient technologies for sustainable infrastructure, Christchurch, New Zealand, 3-5 February 2021
Publié dans:
Page(s): 311-318 Nombre total de pages (du PDF): 8
Page(s): 311-318
Nombre total de pages (du PDF): 8
DOI: 10.2749/christchurch.2021.0311
Abstrait:

Arches are the most prominent architectural feature of tied-arch bridges and offer a dramatic visual impact. Arches rarely exhibit aerodynamic instabilities once tied to the bridge deck; however, during construction they typically have low fundamental frequencies, low inherent structural damping and low mass. This combination makes them especially vulnerable to wind-induced vibrations. The three-dimensionality of the arch shape is best examined through aeroelastic model wind tunnel testing as opposed to sectional model based approaches. In many cases vortex-induced oscillations have been observed for certain discrete stages of arch construction. In some cases, the loads induced by these vortex-induced oscillations can be tolerated by the structure; however, in other cases the responses can be sufficiently large that they must be prevented. Therefore, to prevent vortex-induced oscillations of the arches during construction, different damping strategies have been employed. Two practical methods that have been recently deployed include: (i) an in- line cable damper attached by a cable to the arch and anchored to a firm foundation, and (ii) tuned mass dampers (TMD). In this paper a background on the sources of wind-induced vibrations is presented along with methods to predict the response followed by several mitigation strategies.

Mots-clé:
pont bow-string