A vortex and gallop vibration control device for box-section steel tower columns

Abstract

The invention discloses a vortex-induced vibration and galloping control device used for a box-shaped section steel tower column. Two flow restraining boxes are welded to each transverse-bridge-direction steel board of the steel tower column, the flow restraining boxes are arranged along the height of the whole steel tower column, each flow restraining box comprises two side boards which are parallel to each other and vertically welded to the corresponding transverse-bridge-direction steel board, an edge board parallel to the corresponding transverse-bridge-direction steel board is connected between the two side boards of each flow retraining box, a plurality of partition boards are welded in a box-shaped structure formed by the side boards, the edge boards and the transverse-bridge-direction steel boards, the partition boards are distributed in the height direction of the steel tower column at intervals, and the side boards and / or the edge boards are provided with reinforcing ribs. By changing the pneumatic appearance of the box-shaped section steel tower column, the vortex-induced vibration amplitude of the steel tower column is effectively controlled, galloping instability is prevented, and guarantee is provided for structural safety, running safety and comfort. Meanwhile, the vortex-induced vibration and galloping control device is simple in structure, economical and practical, has a positive effect on improving the visual effect of a bridge, and is mainly applied to the box-shaped section steel tower column of a cable-stayed bridge or a suspension bridge.

Description

technical field [0001] The invention belongs to the fields of bridge engineering and disaster prevention engineering, and in particular relates to a bridge wind-resistant structure. Background technique [0002] Box-section steel tower columns are widely used in the field of bridges at home and abroad. They are simple in shape, convenient in construction, and good in mechanical performance. They are suitable for various span cable-stayed bridges and suspension bridges. [0003] Vortex vibration is a kind of wind-induced limiting vibration with self-excited nature that is easy to appear in the steel tower column of the bridge under low wind speed. Will have a certain impact on vortex shedding. Although vortex vibration is a kind of amplitude-limiting vibration, when the amplitude is large, it will also affect driving safety and cannot be ignored. [0004] At present, since vortex vibration is a kind of amplitude-limited vibration, there will be no catastrophic consequences,...

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Problems solved by technology

[0006] At present, the galloping control of steel tower columns mostly adopts octagonal cross-section with better galloping stability, but the steel plate structure of steel tower columns with this cross-section form is more complicated than box-shaped, especially the structure at the connection nodes is very cumbersome, and the construction is not as good as box-shaped. Shaped cross-section is convenient

Another galloping control method is to make a small corner at the four corners of the box-shaped steel tower column, and install deflectors at the corners to improve galloping stability, but the installation of the deflectors is inconvenient. And it will affect the appearance of the bridge tower to a certain extent, and the treatment of corners also makes the structure of the steel tower column complicated and inconvenient for construction

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