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Method for determining the parameters of double-helix hot-extruded polyethylene semi-parallel steel wire stay cables

A double-helix, parameter-determined technology, applied to bridge parts, bridges, buildings, etc., can solve problems such as not considering aerodynamic resistance, and achieve the effect of small aerodynamic resistance

Active Publication Date: 2018-08-14
SHIJIAZHUANG TIEDAO UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Reducing the aerodynamic resistance on the stay cables can maximize the stress safety of the bridge while saving costs. However, the existing aerodynamic measures only consider the vibration suppression effect, and do not consider the change of aerodynamic resistance after the measures are taken.

Method used

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  • Method for determining the parameters of double-helix hot-extruded polyethylene semi-parallel steel wire stay cables
  • Method for determining the parameters of double-helix hot-extruded polyethylene semi-parallel steel wire stay cables
  • Method for determining the parameters of double-helix hot-extruded polyethylene semi-parallel steel wire stay cables

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] Specific parameters: For a commonly used stay cable with a diameter of 90mm, in the case of winding a double helix, the maximum winding distance that can suppress wind and rain vibration when the diameter of the helix is ​​0.8mm is 6 times the diameter of the stay cable; the diameter of the helix In the case of 1.2mm, the maximum winding spacing that can suppress wind and rain vibration is 8 times the diameter of the stay cable; when the diameter of the helix is ​​1.55mm, the maximum winding spacing that can suppress wind and rain vibration is 14 times the diameter of the stay cable.

[0044] Table 1-1 is a list of different helix parameter combinations that can suppress the vibration of the stay cable (diameter 90mm)

[0045] Helix diameter d(mm)

0.8

1.2

1.55

Helix winding pitch S(D)

6

8

14

[0046] What needs to be emphasized is that the occurrence of wind and rain vibration can only be suppressed under the appropriate parameter ...

Embodiment 2

[0073] For a commonly used stay cable with a diameter of 120mm, in the case of winding a double helix, the maximum winding distance that can suppress wind and rain vibration when the diameter of the helix is ​​1.2mm is 6 times the diameter of the stay cable; the diameter of the helix is ​​1.6mm The maximum winding pitch that can suppress the wind and rain vibration is 12 times the diameter of the stay cable under the condition of 2.0mm; the maximum winding pitch that can suppress the wind and rain vibration is 12 times the diameter of the stay cable when the diameter of the helix is ​​2.0mm.

[0074] Table 1-2 Combination table of different helix parameters that can suppress the vibration of the stay cable (diameter 120mm)

[0075] Helix diameter d(mm)

1.2

1.6

2.0

Helix winding pitch S(D)

6

12

12

[0076]Research shows that under the same parameters, increasing the diameter of the helix alone can also have the effect of suppressing vibrat...

Embodiment 3

[0085] Specific parameters: For a commonly used stay cable with a diameter of 160mm, in the case of winding a double helix, the maximum winding distance that can suppress wind and rain vibration is 12 times the diameter of the stay cable when the diameter of the helix is ​​0.8mm; the diameter of the helix In the case of 1.2mm, the maximum winding spacing that can suppress wind and rain vibration is 14 times the diameter of the stay cable.

[0086] Table 1-3 Combination table of different helix parameters that can suppress the vibration of the stay cable (diameter 160mm)

[0087] Helix diameter d(mm)

0.8

1.2

Helix winding pitch S(D)

12

14

[0088] Research shows that under the same parameters, increasing the diameter of the helix alone can also have the effect of suppressing vibration; reducing the winding distance alone can also have the effect of suppressing vibration. For example, in Table 1, d=0.8mm, S=12D can suppress vibration, d=1.2mm, S...

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Abstract

The invention discloses a method for determining the parameters of a double-helix hot-extruded polyethylene semi-parallel cable-stayed cable, which belongs to the field of cable-stayed bridges. Wind the raised double helix on the outer surface of the stay cable in the same direction, determine the diameter d of the helix and the winding distance S of the same helix according to the wind tunnel test, and find out the double helix winding with the stay cable of different diameter line, the combination of parameter values ​​with the smallest aerodynamic resistance under the premise of suppressing wind and rain vibration; where, S is the multiple of the diameter D of the stay cable. The invention not only can suppress the wind and rain vibration, but also has the best aerodynamic resistance.

Description

technical field [0001] The invention belongs to the technical field of cable-stayed bridge engineering, and in particular relates to a double-helix hot-extruded polyethylene semi-parallel steel wire cable-stayed cable capable of suppressing wind and rain vibration and having the best aerodynamic resistance effect and a parameter determination method thereof. Background technique [0002] Cable-stayed cables are one of the main stress-bearing components of cable-stayed bridges. Currently, hot-extruded PE semi-parallel steel wire cable-stayed cables are the most commonly used cable-stayed cables. A large number of studies have shown that: in a specific wind and rain environment, stay cables often vibrate greatly, which is named wind and rain vibration or wind and rain induced vibration. When wind and rain vibration occurs, the vibration of the stay cable can cause damage to the anchorage area of ​​the cable beam and the anchorage area of ​​the cable tower, cause fatigue damage...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E01D19/16
CPCE01D19/16D07B5/005D07B2201/2086D07B2201/2097D07B2501/203D07B2801/22
Inventor 刘庆宽郑云飞梁新华孙一飞刘小兵马文勇
Owner SHIJIAZHUANG TIEDAO UNIV
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