Control Of Wind-induced Nonlinear
Oscillations In Suspension Bridges
Author(s)
M. Abdel-Rohman
Abstract
In this paper, the along-wind response and across-wind response of the
suspended cables and the bridge deck of a suspension bridge are studied. The
mean wind direction is assumed to be perpendicular to the plane of the
suspended cable. It is shown that the suspended cable, if constructed alone,
gallops in the across-wind direction when the mean wind speed exceeds a critical
wind speed. Similarly, the bridge deck if constructed alone will gallop when the
wind speed exceeds a certain critical wind speed. The construction of a
suspension bridge through coupling the bridge deck with the suspended cables
via vertical hangers will increase the critical wind speed at which galloping
occurs for the bridge. This paper discusses the means of further increasing the
critical wind speed for a suspension bridge using a passive or active control
mechanism.
Keywords: control mechanisms, nonlinear vibrations, structural control,
suspended cables, suspension bridges, wind induced vibrations.
1 Introduction
Long steel suspended cables such as those used in suspension bridges and
electric transmission lines are prone to vibration induced by wind loads. When
the suspended cable and bridge deck are subjected to wind, and because of the
coupling between the bridge deck and the suspended cable, the system behaves
nonlinearly. Significant vibrations may result due to moderate wind speed
combined with the presence of rain or ice on the suspended cables. The rain or
ice accumulated frequently on the cable results in D- and U-shaped crosssections,
which are irregular and prone to galloping at low wind speeds. The
galloping phenomenon can be quite destructive to structures due to the large
Keywords
control mechanisms, nonlinear vibrations, structural control,
suspended cables, suspension bridges, wind induced vibrations.
Related Book
Other papers in this volume
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