Heaving mesh cloth device for inhibiting flutter of sea-crossing bridge

Abstract

The invention belongs to the technical field of bridge wind-induced vibration control research, and provides a heaving mesh cloth device for inhibiting flutter of a sea-crossing bridge, which is characterized in that a large-area heaving mesh cloth which is immersed in water and is provided with a plurality of balancing weights is suspended below a main beam by using ropes. When the bridge vibrates due to wind, the device is driven to move in water, the gravity of the device and the water body generate huge additional mass force and additional damping force on the mesh cloth to do negative work on the main beam, the vibration energy of the bridge is consumed, and large-amplitude vibration of the bridge is efficiently restrained. The device adopts light and standardized components, is convenient to mount, dismount, transport and store, and has the advantages of safety, reliability, economy and practicability.

Description

technical field [0001] The invention belongs to the technical field of bridge wind-induced vibration control research and relates to a heave mesh cloth device for suppressing flutter of cross-sea bridges. Background technique [0002] Modern bridges are developing towards larger spans and more slenderness. Many long-span sea-crossing bridges have been built at home and abroad, and more and larger-span sea-crossing bridges will be built in the future. The structural stiffness and damping of long-span bridges are relatively small, and they are more sensitive to wind loads. The high wind speed and long duration at sea pose severe challenges to the wind safety of bridges. Wind-induced large-scale limit cycle vibration and divergent flutter of long-span bridges need to be eliminated. Bridge flutter control measures mainly include pneumatic measures, structural measures and mechanical measures. Aiming at some deficiencies in the traditional control measures for the flutter of l...

AI Technical Summary

Problems solved by technology

However, there are still some deficiencies in this device: (1) In order to ensure sufficient water resistance, a heave plate with a large enough size is required; in order to ensure the stiffness of the heave plate, it is necessary to increase the thickness of the plate or set a larger size and stiffeners or truss system, which will greatly increase the project cost and reduce its practicability and economy; (2) The device is large in size, inconvenient to disassemble and install, and it is placed at the bottom of the beam for a long time, posing safety hazards; (3) In order to reduce the project cost , it is necessary to reduce the mass of the heave slab as much as possible. On the one hand, when the heave slab rises, the work done by its own weight is small; Negative work is done in half a cycle of upward movement, resulting in less energy consumption and lower control efficiency

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