Pod rain-line type damper suitable for stay cable

Abstract

The invention discloses a pod rain-line type damper suitable for a stay cable. The damper is wound on a stay cable tightly and closely and comprises a protective sleeve, a metal woven layer, cabin partition boards and particles enclosed in cabins. A rope-type cavity is formed by the metal woven layer. The cabin partition boards divide the cavity into a plurality of small cabins, and particles with different particle diameters are evenly distributed in each small cabin. The protective sleeve is coated outside the entire rope-type cavity. The pod rain-line type damper suitable for the stay cable has the advantages that vibration energy of the stay cable can be consumed through the forms such as motions of the particles in the pod rain-line type damper, collisions and frictions between the particles and collisions and frictions between the particles and cabin walls, so that the aim of vibration attenuation of the stay cable is achieved. Due to the fact that the pod rain-line type damper is wound on the stay cable tightly and closely, the aim of damaging of rain lines on the stay cable is achieved. Wind and rain vibrations of the stay cable can be reduced effectively. At the same time, internal damping of the stay cable is increased, so that vibrations in other forms are reduced.

Description

technical field [0001] The invention relates to the technical field of bridge systems, in particular to a pod rainline damper suitable for stay cables. Background technique [0002] With the increase of the span, the long-span cable-stayed bridge becomes softer and softer, which makes the cable-stayed bridge easy to be excited by various external factors and vibrate. The stay cables are prone to vibration because of their small stiffness, light weight, and low damping. And with the continuous increase of the span of the cable-stayed bridge, the cables are getting longer and longer, and the vibration problem of the cables is becoming more and more prominent. The problems of wind-induced vibration caused by aerodynamic instability and parametric vibration caused by structural interaction of stay cables are also becoming more and more prominent. Among them, the wind and rain-induced vibration of the cable is the vibration with the largest amplitude and the most serious disast...

AI Technical Summary

Problems solved by technology

[0004] Judging from several dampers that are widely used in engineering, the damping value provided by the high-damping rubber damper is limited, and the damping value required by the optimal design may not be met for the low-order mode shape; the oil pressure damper and the viscous The biggest disadvantage of the shear material damper is that its performance is highly temperature dependent, and the durability of the fuel consumption material is not very satisfactory; although the frictional damper is not affected by temperature and is easy to adjust, the damping cannot work at small amplitudes , may not be conducive to the fatigue damage of the cable, and the discrete characteristics of the material will also cause the instability of the damping performance; the magnetorheological damper is an adjustable parameter damper made of intelligent materials, which is a new technology with many Advantages, but its price is relatively expensive, etc.

[0005] In the damper introduced above, no matter what kind of damper is adopted, there will be a common effect that the position of the shock absorber is relatively close to the anchorage point of the cable, although it can effectively improve the damage caused by wind-induced vibration at the anchorage point. However, it is not ideal to slow down the amplitude of the middle part of the cable, especially the long cables of long-span cable-stayed bridges. Therefore, in long-span cable-stayed bridges, it is always necessary to rely on several measures for comprehensive consideration. From the perspective of bridge appearance From the point of view, the installation of the above-mentioned damper is also unsightly, and it needs to be solved by combining the pneumatic measures of the cable

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