Wind-resistant design of cables for the Tatara bridge

Miyata, Toshio; Yamada, Hitoshi; Fujiwara, T; Hojo, Tetsuo

doi:10.5169/seals-59830

1998

DOI: 10.5169/seals-59830

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Wind-resistant design of cables for the Tatara bridge

Toshio Miyata¹,

Hitoshi Yamada²,

T Fujiwara³

et al.

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Control of flow around a circular cylinder using a patterned surface

Hojo

2015

Computational Methods and Experimental Measurements XVII

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Controlling the flow around a circular cylinder by the use of patterned surface roughness is investigated. In this study, experimental work to reduce drag coefficient of a circular cylinder was carried out with particular attention to change in the distribution of surface roughness. Drag coefficient of a circular cylinder having discretely patterned surface was compared with uniformly roughened surface. When the circular concave and convex patterns with relative surface roughness of about 1% of the diameter were added discretely to the surface, drag coefficient of a cylinder of the patterned roughness is lower than a cylinder with uniform surface roughness of the same degree, and remains approximately constant beyond the critical Reynolds number. Measurement of the pressure distribution indicated that circular cylinders with a lumped patterned roughness made it possible to reproduce a supercritical state in lower Reynolds number range. It was considered that the lumped patterned roughness changed the flow around the circular cylinder, causing a combining of the laminar separation and the turbulent separation. The drag force characteristics of the circular cylinders were well explained by the results of the pressure distribution measurement. In conclusion, it was found that density and arrangement of lumped roughness was the key factors in controlling the drag characteristics of a circular cylinder. It seems to be possible to adjust those two factors to optimize the drag coefficientReynolds number relationship. Methods in this study to control the drag characteristics in the vicinity of the critical Reynolds number can be applied to all of cylindrical structures in various fields.

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Control of flow around a circular cylinder using a patterned surface

Hojo

2015

Computational Methods and Experimental Measurements XVII

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Aerodynamic Characteristics of Indent Stay Cables of Tatara Bridge

Fukunaga¹,

Takeguchi²

2014

IABSE Reports

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<p> Since the longest stay cables of the Tatara Bridge are about 460 m, various wind tunnel tests were carried out. As a result of the tests, it was found that an indent cable is very effective against rain vibration and the indent cables were applied to the bridge for the first time in the world. It was also found that smooth wind flow without rain is possible to generate large amplitude vibration. As it was thought that this vibration was rarely generated due to actual wind condition, it was decided that countermeasures against this vibration were studied based on monitoring results, if necessary. Monitoring of the cables has been conducted with measurement of wind and rain fall. Although medium amplitude vibration, which was not rain vibration, was observed on the short indent stay cables, harmful vibration such as rain vibration has not been observed until now. Therefore, it was confirmed that the indent cable is effective against rain vibration.</p>

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Wind-resistant design of cables for the Tatara bridge

Cited by 2 publications

References 0 publications

Control of flow around a circular cylinder using a patterned surface

Control of flow around a circular cylinder using a patterned surface

Aerodynamic Characteristics of Indent Stay Cables of Tatara Bridge

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