Diversion device for flat steel box beam bridge vortex vibration control

Abstract

The invention discloses a diversion device for flat steel box beam bridge vortex vibration control. The diversion device comprises a diversion plate which is arranged on the inner side of a detecting rail in the bridge direction. The diversion plate is oblique relative to a bottom plate of a flat steel box beam, and a field angle between the diversion plate and the bottom plate of the flat steel box beam faces outwards. One end of the diversion plate is connected with the bottom plate of the flat steel box beam in a welding mode, the diversion plate is connected with the bottom plate of the flat steel box beam in a welding mode through diversion plate stiffening plates arranged at intervals, and the diversion plate stiffening plates are arranged corresponding to diaphragm plates of the flat steel box beam. Two angular points where the diversion plate stiffening plates and the diversion plate are connected are respectively provided with an over-welding hole. The diversion device is mainly applied to cable-stayed bridges or suspension bridge flat steel box beams, the flat steel box beam bridge vortex-induced amplitude can be effectively restrained, guarantee is provided for traffic safety and comfort, and the measures are simple, economical and practical.

Description

technical field [0001] The invention belongs to the fields of bridge engineering and disaster prevention engineering, and in particular relates to a wind-resistant structure for flat steel box girder bridges. Background technique [0002] Flat steel box girders are widely used in bridges at home and abroad. They are streamlined and have good wind resistance. They are the preferred form of the main girder section of long-span bridges. [0003] Vortex-induced vibration is a kind of wind-induced vibration phenomenon that is easy to occur in long-span bridges under low wind speed. It is mainly generated by the airflow vortex shedding at the end of the cross-section, with certain self-excited characteristics. influences. Therefore, vortex induced resonance is a kind of wind-induced limiting vibration with self-excited nature. Although vortex-induced vibration will not cause devastating damage like flutter and galloping, it is a common form of vibration at low wind speeds, and i...

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Problems solved by technology

[0004] In the previous bridge design, it was considered that the wind resistance performance of the flat steel box girder section was good, and the phenomenon of vortex-induced vibration was not significant, but the influence of vortex shedding generated by the maintenance track and other appendages on the main structure was not considered. Experience has found that the vortex shedding produced by these appendages often has a greater impact on the structure, and has a greater impact on the safety and comfort of driving, which cannot be ignored

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