A wind-induced vibration control method for long-span bridges with adaptive swing flaps

Abstract

The invention relates to a method for controlling wind vibration of a long-span bridge with adaptive swing flaps, and relates to a method for controlling wind vibration of a bridge. Select the flap and determine the size. The shape of the flap is streamlined. The installation spacing of the flaps in the span direction is determined according to the Storohad number of the bridge girder, the cross-sectional size of the bridge girder and the wind tunnel test; the flaps should be arranged symmetrically on both sides of the girder , the relative position of the flap and the nozzle is determined by combining the spanwise vortex interaction area in the wake area of ​​the bridge and the dredging airflow area outside the nozzle; the support center of the flap is the centroid position of the flap, and the flap has torsional stiffness around its central axis and damping, installation shafts are arranged at intervals along the span direction of the main girder, and installation holes are opened on the central axis of the flaps to be rotated and installed on the installation shafts. The spanwise arrangement of the flaps can effectively increase the critical wind speed of flutter and greatly weaken the amplitude of vortex-induced vibration, and improve the wind resistance capacity of long-span bridges. The structure is simple and easy to implement.

Description

technical field [0001] The invention relates to a bridge wind vibration control method, in particular to a long-span bridge wind vibration control method with adaptive swing flaps, belonging to the field of bridge engineering. Background technique [0002] With the continuous increase of bridge span, the structural stiffness and damping continue to decrease, resulting in the increase of bridge sensitivity to wind. Typical wind-induced effects such as flutter, buffeting, and vortex-induced vibration have gradually become key factors that need to be considered in the design of long-span bridges. Among the various wind-induced effects on the main girder of long-span bridges, flutter is a wind-induced vibration with a very obvious vibration response. Once it occurs, it will cause the danger of collapse and damage to the main girder of the bridge. Vortex-induced vibration will cause fatigue damage to the bridge structure. . Therefore, suppressing flutter and vortex-induced vibra...

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Problems solved by technology

[0004] However, since the current flow control form is fixed and cannot be adjusted with changes in wind conditions, the improvement of wind resistance stability has great limitations, and in some special cases it will be detrimental to the suppression of wind-induced vibration

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