Auxiliary cable net system for vibration reduction of extra-large span bridge cables

Abstract

The invention relates to an auxiliary cable net system for vibration reduction of extra-large span bridge cables. The cable net system comprises auxiliary cable bodies (6) for connecting main cables, anchor devices (5) of the auxiliary cable bodies (6) and a cable net node device for connecting the anchor devices (5) and the main cables, wherein the cable net node device comprises cable clamps, and the cable clamps are clamped onto the main cables and connected with the anchor devices (5). With the adoption of the auxiliary cable net system, construction is convenient, durability is good, relaxation resistance is high, fatigue resistance is good, and tension can be adjusted and larger internal damping can be provided, so that the auxiliary cable net can well absorb vibration energy of the main cables, and the purpose of vibration elimination is achieved.

Description

technical field [0001] The invention relates to a bridge cable vibration damping system. It belongs to the technical field of building bridges. Background technique [0002] The span of modern cable-stayed bridges has exceeded 1,000 meters. At present, the world’s first-span cable-stayed bridge is the Sutong Bridge, and its main span is 1,088 meters. Modern cable-stayed bridges are developing towards larger spans. Suo also made more demands. As the span of the cable-stayed bridge increases, the length of the cables also increases, and the cable-stayed bridge and its cables are more and more prone to vibration. As the main component of a cable-stayed bridge, cable vibration may become a major problem related to bridge safety. As the important load-bearing parts of the cable-stayed bridge, the cost of the cable-stayed bridge is about 25%-30% of the whole bridge. With the increase of the span of the cable-stayed bridge, the proportion of the cost of the cable-stayed bridge w...

AI Technical Summary

Problems solved by technology

[0004] 1) Auxiliary cables generally use a cross connection between a whole rope and the main stay cable. The elastic modulus of the rope is small and the dispersion is large, so that the elastic elongation of the auxiliary cable is large and inconsistent when it is installed and tensioned.

In addition, there is no special design of the auxiliary cable anchorage structure, which leads to the difficulty of installing the auxiliary cable, the installation position cannot meet the design requirements, and the vibration reduction effect required by the design engineer cannot be achieved;

[0005] 2) The auxiliary cable is easy to relax during long-term use, and cannot maintain a certain tension, and cannot adjust the tension, so that the auxiliary cable in the cable net is loose, so that the cable net cannot absorb the vibration energy of the main cable;

[0006] 3) The auxiliary cable has poor anti-fatigue performance, cannot adapt to fretting fatigue, and is prone to fatigue damage;

[0007] 4) The auxiliary cable has poor durability and cannot reach the life of the main cable, so it needs to be replaced frequently;

[0008] 5) The auxiliary cable itself has no internal damping, and it will also generate vibration, which seriously affects the accuracy of the design and calculation of the auxiliary cable network system

[0009] In view of the above problems, although people realize that auxiliary cables can absorb shocks, they are not accepted by the majority of bridge designers and engineers in actual bridge engineering design, planning and construction.

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