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A platform for research: civil engineering, architecture and urbanism
Cross-flow aerodynamics of bridge cables with wire meshes
https://orcid.org/0000-0002-0274-4340
Abstract Adverse weather conditions in the northern regions during winter might lead to accumulation of ice or snow on bridge cables and consequently trigger ice shedding. The falling ice poses a risk for the traffic and pedestrians below, which often results in bridge closures and/or insurance claims. A passive surface-modifying device in the form of a steel wire mesh tautened on the surface of a cable sheath was previously found to substantially reduce the risk associated with falling ice through improved ice retention. In this paper, the cross-flow aerodynamic behaviour of bridge cables fitted with steel wire meshes is investigated in detail. The wire mesh generally resulted in higher levels of aerodynamic drag when compared with a plain cable sheath, although the Reynolds number dependence was highly reduced. Several angles of attack were investigated and no instability issues with respect to the across-wind vibrations were observed for any of the tested wire mesh configurations based on the quasi-steady theory. Even though vortex shedding was still present in all cases, the intensity of the fluctuating lift forces was much lower than that of the plain cable. To investigate basic aspects of the flow structure produced by the wire mesh, two flow visualisation techniques, combined with streamwise wind speed measurements in the near wake, were further used and are discussed.
Highlights Innovative surface modifications of bridge cables are investigated in a wind tunnel. Three wire mesh configurations with a different number of wire ropes are compared. The wire mesh was designed to reduce the risk of ice shedding from bridge cables. The test methods include static tests, wake measurements and flow visualisation. Aerodynamic damping is evaluated using quasi-steady theory.
Cross-flow aerodynamics of bridge cables with wire meshes
https://orcid.org/0000-0002-0274-4340
Abstract Adverse weather conditions in the northern regions during winter might lead to accumulation of ice or snow on bridge cables and consequently trigger ice shedding. The falling ice poses a risk for the traffic and pedestrians below, which often results in bridge closures and/or insurance claims. A passive surface-modifying device in the form of a steel wire mesh tautened on the surface of a cable sheath was previously found to substantially reduce the risk associated with falling ice through improved ice retention. In this paper, the cross-flow aerodynamic behaviour of bridge cables fitted with steel wire meshes is investigated in detail. The wire mesh generally resulted in higher levels of aerodynamic drag when compared with a plain cable sheath, although the Reynolds number dependence was highly reduced. Several angles of attack were investigated and no instability issues with respect to the across-wind vibrations were observed for any of the tested wire mesh configurations based on the quasi-steady theory. Even though vortex shedding was still present in all cases, the intensity of the fluctuating lift forces was much lower than that of the plain cable. To investigate basic aspects of the flow structure produced by the wire mesh, two flow visualisation techniques, combined with streamwise wind speed measurements in the near wake, were further used and are discussed.
Highlights Innovative surface modifications of bridge cables are investigated in a wind tunnel. Three wire mesh configurations with a different number of wire ropes are compared. The wire mesh was designed to reduce the risk of ice shedding from bridge cables. The test methods include static tests, wake measurements and flow visualisation. Aerodynamic damping is evaluated using quasi-steady theory.
Cross-flow aerodynamics of bridge cables with wire meshes
https://orcid.org/0000-0002-0274-4340
Abstract Adverse weather conditions in the northern regions during winter might lead to accumulation of ice or snow on bridge cables and consequently trigger ice shedding. The falling ice poses a risk for the traffic and pedestrians below, which often results in bridge closures and/or insurance claims. A passive surface-modifying device in the form of a steel wire mesh tautened on the surface of a cable sheath was previously found to substantially reduce the risk associated with falling ice through improved ice retention. In this paper, the cross-flow aerodynamic behaviour of bridge cables fitted with steel wire meshes is investigated in detail. The wire mesh generally resulted in higher levels of aerodynamic drag when compared with a plain cable sheath, although the Reynolds number dependence was highly reduced. Several angles of attack were investigated and no instability issues with respect to the across-wind vibrations were observed for any of the tested wire mesh configurations based on the quasi-steady theory. Even though vortex shedding was still present in all cases, the intensity of the fluctuating lift forces was much lower than that of the plain cable. To investigate basic aspects of the flow structure produced by the wire mesh, two flow visualisation techniques, combined with streamwise wind speed measurements in the near wake, were further used and are discussed.
Highlights Innovative surface modifications of bridge cables are investigated in a wind tunnel. Three wire mesh configurations with a different number of wire ropes are compared. The wire mesh was designed to reduce the risk of ice shedding from bridge cables. The test methods include static tests, wake measurements and flow visualisation. Aerodynamic damping is evaluated using quasi-steady theory.
Cross-flow aerodynamics of bridge cables with wire meshes
Matejicka, Lubomir (author) / Koss, Holger H. (author) / Georgakis, Christos T. (author)
2022-02-15
Article (Journal)
Electronic Resource
English
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