A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
The invention belongs to the technical field of bridge wind resistance, and particularly relates to a semi-active device for controlling bridge flutter, which comprises a main beam, and an anti-flutter mechanism is mounted in a web of the main beam; under the action of rotation of an outer rack of a driving gear, a driven wheel drives a flow guide rigid plate to synchronously rotate along the outer circle face of a fixed shaft, the flow guide rigid plate rotates in a main beam and inclines to a certain angle, and then the airflow flowing characteristic of a groove in the center of the main beam can be improved; the flow guide rigid plate is rotated to a proper angle, so that the additional lift force of the flow guide rigid plate in the flowing process is reduced, the torsional force of the flow guide rigid plate under the clamping of gravity is further reduced, and the torsional force of the main beam blown by wind is reduced and kept stable; through the elastic characteristic of the spring, the fixing sleeve pulls the main beam against wind power, the internal structure of the main beam is prevented from deviating, the flutter effect is reduced, relative rotation in the main beam under clamping of the torsional force of the main beam is effectively prevented, and the flutter force is reduced.
本发明属于桥梁抗风技术领域，尤其为一种控制桥梁颤振的半主动装置，包括主梁，主梁的腹板内部安装有防颤振机构；在主动齿轮的外齿条旋转作用下，使得从动轮带动着导流刚性板沿着固定轴的外圆面同步旋转，导流刚性板在主梁的内部旋转并倾斜至一定的角度，进而可以改善主梁中央开槽处的气流流动特性，根据风力方向，使得导流刚性板旋转到适宜角度，减小导流刚性板在流动过程中的附加升力，进而减小导流刚性板在重力加持下的扭转力，从而减小主梁在风里吹动下的扭转力并保持稳定；通过弹簧的弹性特质，使得固定套逆着风力“拉住”主梁，防止主梁内部结构偏移并减小颤振效果,且有效防止主梁扭转力的加持下的主梁内部的相对转动并减小颤振力度。
The invention belongs to the technical field of bridge wind resistance, and particularly relates to a semi-active device for controlling bridge flutter, which comprises a main beam, and an anti-flutter mechanism is mounted in a web of the main beam; under the action of rotation of an outer rack of a driving gear, a driven wheel drives a flow guide rigid plate to synchronously rotate along the outer circle face of a fixed shaft, the flow guide rigid plate rotates in a main beam and inclines to a certain angle, and then the airflow flowing characteristic of a groove in the center of the main beam can be improved; the flow guide rigid plate is rotated to a proper angle, so that the additional lift force of the flow guide rigid plate in the flowing process is reduced, the torsional force of the flow guide rigid plate under the clamping of gravity is further reduced, and the torsional force of the main beam blown by wind is reduced and kept stable; through the elastic characteristic of the spring, the fixing sleeve pulls the main beam against wind power, the internal structure of the main beam is prevented from deviating, the flutter effect is reduced, relative rotation in the main beam under clamping of the torsional force of the main beam is effectively prevented, and the flutter force is reduced.
本发明属于桥梁抗风技术领域，尤其为一种控制桥梁颤振的半主动装置，包括主梁，主梁的腹板内部安装有防颤振机构；在主动齿轮的外齿条旋转作用下，使得从动轮带动着导流刚性板沿着固定轴的外圆面同步旋转，导流刚性板在主梁的内部旋转并倾斜至一定的角度，进而可以改善主梁中央开槽处的气流流动特性，根据风力方向，使得导流刚性板旋转到适宜角度，减小导流刚性板在流动过程中的附加升力，进而减小导流刚性板在重力加持下的扭转力，从而减小主梁在风里吹动下的扭转力并保持稳定；通过弹簧的弹性特质，使得固定套逆着风力“拉住”主梁，防止主梁内部结构偏移并减小颤振效果,且有效防止主梁扭转力的加持下的主梁内部的相对转动并减小颤振力度。
Semi-Active Fuzzy Logic Control of Suspension Bridge Flutter
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Active control of flutter of a suspension bridge
| Elsevier | 1992
Aerodynamic Control of Bridge Deck Flutter by Active Surfaces
| Online Contents | 1998
Suspension bridge flutter revisited
| Engineering Index Backfile | 1967