A wind guide and vibration suppression system for long-span bridges

Abstract

The invention relates to the technical field of bridge engineering, in particular to a wind guide and vibration suppression system for a long-span bridge, which includes a main girder, an air guide device and a feedback device. The device includes a wind deflector and a driving mechanism that drives the rotation of the wind deflector. The wind deflector is hinged to the main girder. The feedback device includes a processor, multiple vibration sensors and wind speed detectors, and the vibration sensors and wind speed detectors are electrically connected to the processor. , a plurality of vibration sensors are dispersedly arranged on the main beam, and the driving device is electrically connected with the processor. This solution is different from the existing method of changing the wind load on the main girder individually and independently by setting fixed aerodynamic accessories. This solution changes the aerodynamic shape of the main girder in a timely manner through the simulation results of the vibration mode of the main girder. The dynamic control system with feedback and active adjustment has fast and effective suppression of eddy vibration and wide adaptability.

Description

technical field [0001] The invention relates to the technical field of bridge engineering, in particular to a wind-guiding and vibration-suppressing system for large-span bridges. Background technique [0002] Due to the application of new materials and new technologies in the field of bridge engineering, bridge structures are developing in a long-span and gentle direction, which makes the structural rigidity continue to decrease, and is more sensitive to the effect of wind and more prone to vortex vibration. With the occurrence of obvious and even very serious vortex vibration in several large-span bridges in China, which seriously threatens driving safety and causes traffic closure, it has become the focus of attention for a while, and effective vibration suppression measures are essential. The traditional rigid aerodynamic measures have certain limitations, which are usually aimed at specific wind vibration phenomena; it is difficult to universally apply all cross-section...

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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