An aerodynamic structure to improve the flutter performance of double-deck highway steel truss girder suspension bridges

Abstract

The invention discloses a pneumatic structure for improving the flutter performance of a dual-layer road steel truss suspension bridge. The pneumatic structure is arranged on the dual-layer road steel truss suspension bridge and used for improving flutter stability of the bridge. Two vertical steady plates are installed below a lower-layer truss bridge face in the length direction, are symmetrically arranged on the two sides of the truss bottom and penetrate through cross beams of a lower-layer truss; the lower edges of the steady plates are attached to the upper planes of detector car rails of the truss bottom to form a whole; and thus the steady plates and the detector car rails form the pneumatic structure for improving the flutter performance jointly. The pneumatic structure is arranged below the lower-layer bridge face and combined with the detector car rails, the steady plates can be used as longitudinal beams to participate in structural stress and share chord loads, the effective height of the pneumatic structure and the integral rigidity of the bridge are increased, and the flutter stability of the bridge is improved.

Description

technical field [0001] The invention relates to the field of bridge wind engineering, in particular to the field of flutter control of double-layer highway steel truss girder suspension bridges. Background technique [0002] Steel truss girders have high rigidity and strong bearing capacity, and are often used as stiffening girders in long-span suspension bridges. However, compared with streamlined steel box girders, highway steel truss girder suspension bridges have weaker flutter performance, and aerodynamic measures are usually required to improve their flutter stability. Traditional single-deck steel truss girder suspension bridges usually use upper and lower stabilizer plates to improve the flutter performance of the bridge ( figure 1 ). For double deck steel truss girder suspension bridges ( figure 2 ), due to the special structure, there is serious flow interference between the upper and lower decks, and the aerodynamic characteristics are very complex. The tradit...

AI Technical Summary

Problems solved by technology

For double deck steel truss girder suspension bridges ( figure 2 ), due to the special structure, there is serious flow interference between the upper and lower bridge decks, and the aerodynamic characteristics are very complicated. Traditional aerodynamic measures cannot effectively improve the flutter performance of the stiffened beam, and sometimes even deteriorate its flutter performance

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