Air guide and vibration suppression system for long-span bridge

Abstract

The invention relates to the technical field of bridge engineering, in particular to an air guide and vibration suppression system for a large-span bridge, which comprises a main beam, air guide devices and feedback devices, the air guide devices are arranged on the upper surface and the lower surface close to the two side ends of the main beam, each air guide device comprises an air guide plate and a driving mechanism for driving the air guide plate to rotate, and the air guide plates are hinged to the main beam; and the feedback device comprises a processor, a plurality of vibration sensors and a wind speed detector, the vibration sensors and the wind speed detector are electrically connected with the processor, the plurality of vibration sensors are dispersedly arranged on the main beam, and the driving device is electrically connected with the processor. Different from an existing mode of singly and independently changing the wind load borne by the main beam by arranging fixed pneumatic accessories, the scheme changes the pneumatic shape of the main beam in time according to the simulation result of the vibration mode of the main beam, and is a dynamic control system with feedback and active adjustment; and vortex vibration can be quickly and effectively inhibited, and the adaptability is wide.

Description

technical field [0001] The invention relates to the technical field of bridge engineering, in particular to a wind guide and vibration suppression system for long-span bridges. Background technique [0002] Due to the application of new materials and new technologies in the field of bridge engineering, the bridge structure is developing towards a long-span and soft direction, which makes the structure rigidity continue to decrease, is more sensitive to the effect of wind, and is more prone to vortex vibration. As obvious or even very serious eddy vibrations occurred on several long-span bridges in China, which seriously threatened driving safety and caused traffic closures, they became the focus of attention for a while, and effective anti-vibration measures were essential. Traditional rigid aerodynamic measures have certain limitations, which are usually aimed at specific wind vibration phenomena; it is difficult to apply to all cross-section types and the wind resistance p...

AI Technical Summary

Problems solved by technology

Traditional rigid aerodynamic measures have certain limitations, which are usually aimed at specific wind vibration phenomena; it is difficult to universally apply to all cross-section types and the wind resistance performance of ultra-wide and ultra-long-span bridges is limited, and it is difficult to meet the requirements of high wind resistance indicators

[0003] Most of the existing technologies reduce the occurrence of vortex shedding by fixedly installing bridge accessories on both sides of the bridge that can change shape with the wind, but the above methods are all passive adaptations, and the change form is single, only changing the local airflow independently, which is different from There is no dynamic connection between the change of the vibration state of the whole bridge. Furthermore, because the disturbance of the airflow to the bridge is ever-changing, its wind speed and wind direction are uncertain. Vibration phenomenon strengthened

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