Bridge Vortex Vibration Control With Sliding Wind Shields
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Solution Overview
Problem
Long-span bridges experience vortex-induced vibration at low wind speeds due to poor aerodynamic performance, leading to structural instability and potential damage.
Innovation Solution
A control device comprising a control unit with sliding sheets and a wind shielding structure at the bridge's bottom, which includes a mounting rod with spherical hinges, allowing for movement and adjustment to counteract vortex-induced vibrations by altering airflow direction and reducing deformation stress.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a box girder is used for the bridge structure, then the dead weight is reduced and rigidity is improved, but aerodynamic performance deteriorates and vortex-induced vibration occurs
Solution Approach 1:
A control device is introduced as an intermediary between the box girder and the airflow. This device includes a control unit with sliding sheets and wind shielding structures that can be adjusted to intercept and redirect vortices, preventing them from directly acting on the box girder while preserving the structural advantages of the box girder design
Solution Approach 2:
The control device incorporates movable sliding sheets that can dynamically adjust their position in response to vortex-induced vibrations. The sliding sheets move along sliding grooves to change the configuration of wind shielding structures, adapting to varying vibration conditions and airflow patterns to maintain optimal aerodynamic performance
2Reliability
If wind shielding structures are added to control vortex-induced vibration, then vibration amplitude is reduced, but device complexity increases
Solution Approach 1:
The control device is divided into multiple independent control units, each comprising sliding sheets and wind shielding structures. These segmented units can be independently adjusted and controlled, allowing for localized response to vortex-induced vibrations without requiring complex system-wide control mechanisms
Solution Approach 2:
The sliding sheets are designed to automatically respond to vortex-induced vibrations through their mechanical connection to the bridge structure. The vibrations themselves drive the sliding sheets to adjust the wind shielding configuration, eliminating the need for external sensors, actuators, or control systems
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The control device effectively reduces the amplitude of vortex-induced vibrations by changing airflow direction and preventing deformation of the bridge structure, ensuring safer and more stable bridge operations.
Implementation Method 1
The base is formed with a sliding groove along a length direction, a wedge block is provided in the sliding groove in a sliding mode... An end of each of the sliding sheets is provided with wedge surfaces matched with the wedge block
Implementation Method 2
The mounting rod also includes a middle rod. An upper end of the middle rod is connected with the upper rod through a first spherical hinge and a lower end of the middle rod is connected with the lower rod through a second spherical hinge
Implementation Method 3
Vortex-induced vibration is a wind-induced vibration of a long-span bridge at a low wind speed... any bluff body when located in fluid flowing at a constant flow rate, may alternately cause vortices off the surface of the body on both sides of the body. Karman Vortex Street effect is similar to this
Data Source
AI summary
A control device for bridge vortex vibration comprising a control unit arranged at a bottom of a bridge. The control unit includes several controllers which include a base and several sliding sheets. The base is formed with a sliding groove along the length direction. A wedge block is slidably provided in the sliding groove. Each side of two sides of the base is provided with several sliding holes. Each of the sliding sheets is arranged in a corresponding one of the sliding holes. An end of each of the sliding sheets is provided with a wedge surface matched with the wedge block. A bottom of each of the sliding sheets is provided with a wind shielding structure. The object of the disclosure is to solve the technical problem of possible vortex vibration of a bridge under the condition of a low wind speed.