Pneumatic structure for improving vortex-induced vibration performance of wide-width steel box superposed beam

Abstract

The invention discloses a pneumatic structure for improving the vortex-induced vibration performance of a wide-width steel box superposed beam. Tuyeres are symmetrically disposed on the outer side faces of two steel box type main longitudinal beam bodies respectively on the left and right. Each tuyere is structurally a right-angled triangle defined by a horizontal plate extending longitudinally along the corresponding main beam body, an oblique plate extending longitudinally along a corresponding vertical beam body and a vertical outer side face of the corresponding main beam body, wherein thebottom of the oblique plate is flush with the bottom face of the corresponding main beam body, in the right-angled triangle, the length of the other right-angled side is expressed in a formula that D=(0.15-0.22)*H, H refers to the height of the main beam body, and the angle alpha between the horizontal plate and the oblique plate is 30 degrees to 45 degrees. The pneumatic structure overcomes thedefects of high construction difficulty and low economic efficiency of traditional integrated tuyeres, fundamentally suppresses or weakens the formation of beam bottom vortexes, reduces the vortex amplitude of the main beam bodies, improves the use comfort of bridges and ensures the structural safety of the steel box superposed beam. The pneumatic structure has the advantages of being light in weight, convenient to construct, great in economic efficiency and the like.

Description

technical field [0001] The invention relates to the field of bridge wind-resistant engineering, in particular to an aerodynamic structure for bridge vortex-induced vibration control of wide steel box composite girders. Background technique [0002] Composite beam section bridges have been favored by Europe, America and other countries since they came out in the original West Germany in the 1970s, and have also been widely used in my country since the 1990s. According to the shape of the main longitudinal beam of composite beams, common composite beams can be divided into steel box composite beams (see figure 1 ) and I-type composite beams (see figure 2 ). figure 1 Middle 1 is the main longitudinal beam (steel box), 2 is the concrete bridge deck, 3 is the cantilever end, and 4 is the small longitudinal beam. [0003] From the perspective of aerodynamics, the section of box-type composite beam has obvious blunt body characteristics, and is a semi-open section, which provid...

AI Technical Summary

Problems solved by technology

This type of measure has the disadvantages of large changes to the beam body, high construction difficulty, and large steel consumption.

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