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Cable-stayed bridge stay rope capable of resisting aerodynamic instability

A cable-stayed bridge and wire rope technology is applied in the cable-stayed bridge field to achieve the effects of suppressing dry cable galloping vibration, avoiding wind and rain-induced vibration, and restraining wind and rain-induced vibration.

Inactive Publication Date: 2012-02-08
SHANGHAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the current aerodynamic vibration reduction measures cannot suppress the occurrence of these two aerodynamic instability phenomena at the same time. Therefore, it is necessary to propose new aerodynamic vibration reduction measures and develop stay cables that can simultaneously suppress galloping vibrations of dry cables and wind and rain-induced vibrations.

Method used

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  • Cable-stayed bridge stay rope capable of resisting aerodynamic instability
  • Cable-stayed bridge stay rope capable of resisting aerodynamic instability
  • Cable-stayed bridge stay rope capable of resisting aerodynamic instability

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] see Figure 4 , Figure 5 and Figure 6 , a cable-stayed bridge cable 1 capable of resisting aerodynamic instability, including a central wire rope 2 and a surface sheath 3 wrapping the central wire rope, characterized in that the outer sheath of the surface sheath 3 is covered with a corrugated opening cover 5. The perforated holes on the wave-shaped perforated cover 5 will allow rainwater to flow into the inner gap of the wave-shaped perforated cover 5, blocking the formation of rain lines on the surface of the wave-shaped perforated cover 5, thereby avoiding wind and rain-induced vibration of the cables Simultaneously, this hole improves the airflow turbulence acting on the surface of the cable, also destroys the formation of the regular rainwater line, and suppresses the occurrence of wind and rain-induced vibration; the wave-shaped opening cover 5 can destroy the Karman vortex in the wake area of ​​the cable. The regularity of the axial flow and axial vortex dest...

Embodiment 2

[0033] This embodiment is basically the same as Embodiment 1, and the special features are:

[0034] The wave-shaped opening cover 5 is wave-shaped along the axial direction of the cable 1, and an effective gap is maintained between the inner side of the wave-shaped opening cover 5 and the surface sheath 3, which is suitable for the circulation of rainwater; At an effective distance, it is fixedly connected with the surface sheath 3 through an annular connecting piece 4 with a hole.

[0035] The thickness of the wave-shaped perforated cover 5 is 1-3 mm, and the material is metal or high molecular polymer; along the axial direction, every 200-500 mm is fixedly connected to the surface sheath 3 through an annular connector 4 with holes; The distance between the inner side of the shape opening cover 5 and the surface sheath 3 is 10-30mm.

Embodiment 3

[0037] This embodiment is basically the same as embodiment two, and the special features are:

[0038]The annular perforated connector 4 is a ring, and its radial dimension should be the distance between the inner side of the wave-shaped perforated outer cover 5 and the surface sheath 3, and radial screw holes are evenly distributed along the circumference, through which the screws 7 are connected. The corrugated opening cover 5 and the surface sheath 3 are fixedly connected; the axial through holes 8 on the inner side are evenly distributed along the circumferential direction to provide channels for the inflowing rainwater.

[0039] The installation method is:

[0040] refer to Figure 4 , the cable-stayed bridge cable with the wave-shaped hole cover in this embodiment, the wave-shaped hole cover 5 is made according to the diameter of the stay cable 1 and the installation spacing, and then the wave-shaped hole cover 5 is set on the surface of the cable 1 The appearance of t...

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Abstract

The invention relates to a cable-stayed bridge stay rope capable of resisting the aerodynamic instability, which comprises a center steel wire cable and a surface sheath, wherein the surface sheath covers the center steel wire cable, a wave-shaped open hole outer cover is covered on the periphery of the surface sheath, rain can be leaked from holes of the outer cover, the formation of rain lines on the surface of the outer cover is blocked, and the wave-shaped open hole outer cover can also damage the regularity of the Karman vortex street in the tail current region of the stay rope and the regularity of the axial flow and the axial vortex, so the occurrence of the stay rope wind-rain induced vibration can be avoided, the occurrence condition of dry galloping can be damaged, and the safety of the stay cable is improved.

Description

technical field [0001] The invention relates to a cable-stayed bridge cable, in particular to a cable-stayed bridge cable capable of resisting aerodynamic instability. Background technique [0002] Cable-stayed bridges are one of the main forms of long-span bridges due to their beautiful appearance and large spanning capacity. Cable-stayed cables are the main load-bearing components of cable-stayed bridges. They have the characteristics of small self-weight, high flexibility, and low damping. Under the action of wind load or the combined action of wind and rain, they are prone to aerodynamic instability, resulting in wind-induced vibration of the cables. The large vibration of the cable-stayed cables will cause fatigue of the cables, fatigue cracks at the cable-anchor joints, damage to the anti-corrosion system of the cables, etc., seriously endangering the safety of the cable-stayed bridge and causing psychological panic for pedestrians. [0003] There are many forms of ae...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E01D19/16
CPCD07B5/006D07B5/005D07B2201/2086D07B2401/202D07B2501/203
Inventor 杜晓庆张烨陈柳花
Owner SHANGHAI UNIV
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