CN106284075B - The parameter determination method of half parallel steel wire suspension cable of bifilar helix hot extruded polyethylene - Google Patents
The parameter determination method of half parallel steel wire suspension cable of bifilar helix hot extruded polyethylene Download PDFInfo
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- CN106284075B CN106284075B CN201610844845.8A CN201610844845A CN106284075B CN 106284075 B CN106284075 B CN 106284075B CN 201610844845 A CN201610844845 A CN 201610844845A CN 106284075 B CN106284075 B CN 106284075B
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- D—TEXTILES; PAPER
- D07—ROPES; CABLES OTHER THAN ELECTRIC
- D07B—ROPES OR CABLES IN GENERAL
- D07B5/00—Making ropes or cables from special materials or of particular form
- D07B5/005—Making ropes or cables from special materials or of particular form characterised by their outer shape or surface properties
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D19/00—Structural or constructional details of bridges
- E01D19/16—Suspension cables; Cable clamps for suspension cables ; Pre- or post-stressed cables
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- D—TEXTILES; PAPER
- D07—ROPES; CABLES OTHER THAN ELECTRIC
- D07B—ROPES OR CABLES IN GENERAL
- D07B2201/00—Ropes or cables
- D07B2201/20—Rope or cable components
- D07B2201/2083—Jackets or coverings
- D07B2201/2084—Jackets or coverings characterised by their shape
- D07B2201/2086—Jackets or coverings characterised by their shape concerning the external shape
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- D—TEXTILES; PAPER
- D07—ROPES; CABLES OTHER THAN ELECTRIC
- D07B—ROPES OR CABLES IN GENERAL
- D07B2201/00—Ropes or cables
- D07B2201/20—Rope or cable components
- D07B2201/2095—Auxiliary components, e.g. electric conductors or light guides
- D07B2201/2097—Binding wires
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- D—TEXTILES; PAPER
- D07—ROPES; CABLES OTHER THAN ELECTRIC
- D07B—ROPES OR CABLES IN GENERAL
- D07B2501/00—Application field
- D07B2501/20—Application field related to ropes or cables
- D07B2501/2015—Construction industries
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Abstract
A kind of parameter determination method of half parallel steel wire suspension cable of bifilar helix hot extruded polyethylene of the present invention, belongs to cable-stayed bridge field.Wind the bifilar helix of protrusion in the same direction on the outer surface of suspension cable, the diameter d of helix and the winding interval S of same helix are determined according to wind tunnel test, when finding out with the suspension cable of different-diameter winding bifilar helix, to the combining parameter values of aerodynamic drag minimum under the premise of pressing down wind and rain and shaking；Wherein, S is the multiple of suspension cable diameter D.The present invention can inhibit wind and rain to shake while have optimum pneumatic resistance again.
Description
Technical field
The invention belongs to cable-stayed bridge field of engineering technology more particularly to one kind, and wind and rain can be inhibited to shake while having again most
The half parallel steel wire suspension cable of bifilar helix hot extruded polyethylene and its parameter determination method of good aerodynamic drag effect.
Background technology
Suspension cable is one of main bearing member of cable-stayed bridge, and half parallel steel wire suspension cables of hot extrusion PE are most common at present
Suspension cable form.Numerous studies show：Suspension cable substantially vibrates frequent occurrence under specific wind and rain environment, is named as wind and rain
It shakes or rain wind induced vibration.When generation wind and rain shakes, the vibrational energy of suspension cable causes the destruction of cable-girder anchorage zone, cable-pylon anchorage zone,
Cause bitter end portion junction portion to generate fatigue rupture, destroys the corrosion protection system of suspension cable, suspension cable can be caused to fail when serious.Together
When, vibration can cause the phase mutual friction changing of the relative positions between suspension cable inner wire, damage the anti-corrosion material of steel wire surface so that corrosion
Steel wire fatigue strength afterwards reduces.In addition, for wind and rain shake vibration damping damping unit also often by the substantially vibration institute of suspension cable
It destroys.
In order to inhibit the generation of this vibration, currently used method to there is mechanical measure (setting damper etc.), structure to arrange
Apply (setting lazy halyard etc.) and aerodynamic Measures.With the increase of cable-stayed bridge across footpath, the length of suspension cable also increases therewith, in oblique pull
The effect of rope end set damper is limited；Suspension cable, which is connected together, using lazy halyard can destroy whole beauty, therefore this
Kind measure is using less；Aerodynamic Measures are considered as practical ways.
Since the wind load on long span stayed-cable bridge suspension cable accounts for the major part of full-bridge wind load, uses and pneumatically arrange
The change for applying aerodynamic drag on rear suspension cable is also to need emphasis to consider the problems of in Bridge Design.Reduce and is pneumatically hindered on suspension cable
Power can ensure the stress safety of bridge to greatest extent in the case of cost-effective, however existing aerodynamic Measures are only examined
Consider inhibition of vibration, does not account for the variation of aerodynamic drag after taking measures.
Invention content
Technical problem to be solved by the invention is to provide a kind of half parallel steel wire suspension cables of bifilar helix hot extruded polyethylene
And its parameter determination method, wind and rain can be inhibited to shake while there is best aerodynamic drag again.
In order to solve the above technical problems, the technical solution used in the present invention is：A kind of bifilar helix hot extruded polyethylene half
Parallel steel wire suspension cable is wound with the bifilar helix of protrusion in the same direction on the outer surface of suspension cable.
Further technical solution, the winding interval S of same helix are the integral multiple of suspension cable diameter D.
Further technical solution, the diameter D=90mm-160mm of suspension cable, the diameter d=0.8mm-2mm of helix,
Wind interval S=6D-14D.
A kind of parameter determination method of half parallel steel wire suspension cable of bifilar helix hot extruded polyethylene, in the oblique pull of same diameter
The bifilar helix of different-diameter and different winding interval Ss is wound on the outer surface of rope in the same direction, by wind tunnel test, determination is inhibiting
The spiral linear diameter d of aerodynamic drag minimum is that optimal parameter combines with winding interval S under the premise of wind and rain shakes, the optimal parameter group
Close the spiral linear diameter d wound on the as suspension cable of same diameter and winding interval S.
Further technical solution, the wind tunnel test methods are as follows：
The influence of development test wind speed, rainfall, inclination angle, wind angle first, amplitude is most when finding suspension cable without helix
Parameter setting when big；
Secondly, based on these parameters, different-diameter, different spacing are successively wound on the suspension cable of same diameter
Helix investigates the influence of the winding interval S, diameter d of helix to inhibition of vibration, finds energy under identical environmental condition
The different parameters combination of enough vibration suppressions；And then by dynamometer check study these parameter combinations namely helix winding interval S and
Influences of the diameter d to aerodynamic drag selects to correspond to when the aerodynamic drag minimum on suspension cable under the premise of meeting inhibition of vibration
Helix parameter combination, that is, aerodynamic drag minimum parameter combination；
Using identical method, for the suspension cable of different-diameter, find out with inhibition of vibration and optimum pneumatic resistance
The parameter combination of helix.
Further technical solution, the wind tunnel test carry out in the atmospheric boundary layer wind tunnel of wind1 tunnel laboratory, simulation
Real scene；The wind-tunnel is that the double test sections of a series connection return/direct current boundary layer wind tunnel, and slow-speed test section is 4.4 meters wide, 3 meters high, long
24 meters, maximum wind velocity is more than 30 meter per seconds；High-speed test (HST) section is 2.2 meters wide, 2 meters high, 5 meters long, and maximum wind velocity is more than 80 meter per seconds, stream
Field is functional；Rainfall equipment is completed using the rainfall simulation system of custom-made, and the rainfall simulation system is by that can realize open loop
Or the control system of closed-loop control, water system, spray system composition, wherein spray system is by 4 in different spatial
The sprinkler composition of the different bores of group 12 adjusts pressure by control system, can be with accurate simulation from 10mm/h to 240mm/h
The rainfall of rainfall intensities at different levels, while being consistent with natural precipitation in terms of raindrop spectral property, the precision of rainfall intensity is
2%, rainfall ranging from wide 4m, down wind length 4m.
Further technical solution, the determination of maximum aerodynamic drag：
First, according to basic wind speed V10Or the design wind speed V at bridge sites10And the benchmark of stay cable of cable-stayed bridge is high
Degree, determines the wind speed V at altitude datum ZzWith quiet gustiness Vg；
Second, according to quiet gustiness VgWith average annual temperature, humidity, air pressure calculate suspension cable Reynolds number, Re=UD/ ν,
Wherein U is arrives stream wind speed, and unit m/s, D are suspension cable model diameter, and unit m, ν are air movement viscosity；ν=μ/ρ,
Middle ρ is the density of air, units/kg/m3, μ is air dynamic resistance viscosity；
Third, the Reynolds number numerical value obtained according to suspension cable diameter calculation, in conjunction with suspension cable diameter and winding different parameters
The Reynolds number partition table of helix suspension cable, determines the region where Reynolds number；
4th, if quiet gustiness VgCorresponding Reynolds number is in close-to-critical range, according to suspension cable diameter and winds not
Same parameter helix suspension cable resistance coefficient statistical form determines the corresponding close-to-critical range resistance coefficient of suspension cable, and according to formula
(1) quiet gustiness V is calculatedgCorresponding aerodynamic drag, using counted aerodynamic drag as wind speed from as low as VgEntire wind speed range
Interior maximum aerodynamic drag；
In formula：ρ-atmospheric density, units/kg/m3
Vg- quiet gustiness
CDThe resistance coefficient of-stay cable of cable-stayed bridge
An- bridge stay cable down wind projected area m2；Its diameter is multiplied by its standoff height
5th, if quiet gustiness VgCorresponding Reynolds number is in critical zone, then resistance coefficient is quasi- by biquadratic function
Formula (2) is closed to calculate：
CD=aRe4+bRe3+cRe2+dRe+e (2)
The corresponding resistance coefficient of suspension cable and formula (2) are obtained according to experiment, determines the corresponding C of critical zone Reynolds numberD, then
The corresponding C of close-to-critical range Reynolds number determined in conjunction with the 4th stepD, draw CDWith the change curve of Reynolds number, according to this curve and public affairs
Formula (1) calculates and draws out aerodynamic drag with wind speed from as low as VgChange curve, find the pneumatic resistance of maximum in this curve
Power, as wind speed from as low as VgMaximum aerodynamic drag in entire wind speed range；
6th, if quiet gustiness VgCorresponding Reynolds number is in supercritical region, according to suspension cable diameter and winds not
Same parameter helix suspension cable resistance coefficient statistical form determines the resistance coefficient of the corresponding supercritical region of suspension cable, in conjunction with the 4th
The corresponding C of close-to-critical range Reynolds number that step, the 5th step determine respectivelyD, the corresponding C of critical zone Reynolds numberD, draw CDWith Reynolds number
Change curve calculate according to this curve and formula (1) and draw out aerodynamic drag with wind speed from as low as VgChange curve,
The maximum aerodynamic drag in this curve is found, as wind speed from as low as VgMaximum aerodynamic drag in entire wind speed range；
With the suspension cable of same diameter, the helix parameter combination that can inhibit vibration is reselected, repeats above-mentioned third
To the 6th step, the maximum aerodynamic drag of suspension cable under each group helix parameter is obtained, selects maximum aerodynamic drag numerical value minimum
Helix parameter combination when one group of helix parameter combination namely aerodynamic drag minimum, the helix parameter as optimization
Combination.
It is using advantageous effect caused by above-mentioned technical proposal：The present invention is outside half parallel steel wire suspension cables of hot extrusion PE
Bifilar helix is wound, a kind of aerodynamic Measures for making suspension cable be taken with good inhibition of vibration and aerodynamic resistance characteristics are led to
Influence of the helix interval S, diameter d wound on overtesting research different-diameter suspension cable to aerodynamic drag, makes suspension cable exist
Under the premise of with good inhibition of vibration, reach the parameter combination of aerodynamic drag minimum.
Description of the drawings
Fig. 1 is the structural schematic diagram of the embodiment of the present invention；
Fig. 2 is the structural schematic diagram in cross section of the present invention；
In figure：1, suspension cable；2, helix；3, PE wrap jackets；4, steel wire corrosion protective covering；5, steel wire grease is protected
Layer.
Specific implementation mode
The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.
Referring to attached drawing 1 of the present invention, bifilar helix is wound on the outer surface of suspension cable 1, spiral is determined according to wind tunnel test
The diameter d of line 2 and the winding interval S of same helix, when finding out with the suspension cable of different-diameter winding bifilar helix,
Press down the combining parameter values to aerodynamic drag minimum under the premise of wind and rain shakes；Wherein, S is the multiple of suspension cable diameter D.
Further technical solution, the bifilar helix spiral winding in the same direction are as shown in Figure 1.Fig. 2 is the cross-section of the present invention
Face figure, suspension cable 1 be steel wire strand, per share steel wire outer wrapping steel wire grease protective layer 5, core outer wrapping steel wire corrosion protective covering 4,
Outermost layer is hot extrusion PE wrap jackets 3, and helical wound is outside PE wrap jackets.
In order to study the winding interval S of the helix wound on different-diameter suspension cable, diameter d to the shadow of aerodynamic drag
It rings, is simulated the wind tunnel test of real scene.Wind tunnel test is carried out in the atmospheric boundary layer wind tunnel in wind laboratory.
The wind-tunnel is that the double test sections of a series connection return/direct current boundary layer wind tunnel.Its slow-speed test section is 4.4 meters wide, 3 meters high, 24 meters long, maximum
Wind speed is more than 30 meter per seconds；High-speed test (HST) section is 2.2 meters wide, 2 meters high, 5 meters long, and maximum wind velocity is more than 80 meter per seconds, and Flow Field Performance is good
It is good.Rainfall equipment is completed using the rainfall simulation system of custom-made, and the system is by achievable open loop or the control of closed-loop control
System, water system, spray system composition, wherein spray system are by the 4 groups 12 different bores in different spatial
Sprinkler composition adjusts pressure by control system, can be with the drop of at different levels rainfall intensities of the accurate simulation from 10mm/h to 240mm/h
Rain, while being consistent with natural precipitation in terms of the characteristics such as raindrop size distribution.The precision of rainfall intensity is 2%, and rainfall is ranging from wide
4m, down wind length 4m.
In order to compare the vibration suppression of helix as a result, having studied the factors such as the test wind, rainfall, inclination angle, wind angle first
Influence, have found parameter setting when no helix suspension cable amplitude maximum.Based on these test parameters, in suspension cable
The helix of upper priority winding different-diameter, different spacing, has investigated the influence of helix interval S, diameter d to inhibition of vibration,
Have found the parameter combination with good inhibition of vibration.And then the influence of helix interval S, diameter d to aerodynamic drag is had studied,
Under the premise of meeting inhibition of vibration, the parameter combination of aerodynamic drag minimum is had found.
The present invention considers two key factors：First, wind and rain can be inhibited to shake；Second, inhibition of vibration can reached
All parameters in, corresponding parameter when selecting the parameter namely wind load minimum of aerodynamic drag minimum, as gas of the invention
Dynamic measure.
The principle of the invention：Under specific wind and rain environment, the surface of suspension cable can form a waterline, and the formation of waterline changes
The circular cross section of suspension cable is become so that the suspension cable section with waterline becomes aerodynamic instability section, so as to cause vibration
Occur.The purpose of winding screw line is exactly to form continuous waterline in order to prevent.
Due to a diameter of 90mm to 160mm of common suspension cable, the present invention is by taking 90mm, 120mm, 160mm as an example to this
Invention is explained in detail.It should be noted that the corresponding spiral linear diameter d of different-diameter suspension cable cited by the present invention and
Winding interval S is best parameter combination, and other parameter combinations can also reach inhibition of vibration, in addition removes what the present invention referred to
Outside common suspension cable, for the suspension cable that the present invention does not refer to, test method provided by the present invention can also be used, is reached
To under the premise of meeting inhibition of vibration, the parameter combination of aerodynamic drag minimum is obtained.
Embodiment 1
Design parameter：For the suspension cable of common 90mm diameters, in the case where winding bifilar helix, spiral linear diameter
It is 6 times of suspension cable diameters that can inhibit the maximum winding spacing that wind and rain shakes in the case of for 0.8mm；The a diameter of 1.2mm of helix
In the case of can inhibit the maximum winding spacing that wind and rain shakes to be 8 times of suspension cable diameters；The case where helix a diameter of 1.55mm
It is 14 times of suspension cable diameters that can inhibit the maximum winding spacing that wind and rain shakes down.
Table 1-1 is the different helix parameter combination tables that suspension cable (diameter 90mm) can be inhibited to vibrate
| Spiral linear diameter d (mm) | 0.8 | 1.2 | 1.55 |
| Helical wound interval S (D) | 6 | 8 | 14 |
It is emphasized that could only inhibit the generation that wind and rain shakes, unsuitable parameter group under parameter combination appropriate
The generation of vibration, the instead generation of excited vibrational cannot not only be inhibited by closing.Numerous studies show with helix interval S, helix
Diameter d is parameter, and there are many kinds of the combinations that disclosure satisfy that inhibition of vibration.Which kind of helix parameter conduct is selected in Practical Project
Vibration suppression measure, it is necessary to consider influence of the helix parameter to suspension cable aerodynamic drag, make the aerodynamic drag on suspension cable as possible
Reach minimum.
Studies have shown that under same parameter, individually increase the diameter of helix, equally there is inhibition of vibration；Individually subtract
Small winding spacing similarly has inhibition of vibration.For example, d=1.2mm, S=8D energy vibration suppression, d=1.55mm, S=8D can also press down
It shakes, d=1.2mm, S=6D also can vibration suppressions.
According to《Highway bridge wind force proofing design specification》Regulation, the wind load on bridge member in addition to girder are normally only examined
Consider the drag effect on wind action direction.It is calculated according to specification prescriptive procedure pneumatic on winding different parameters helix suspension cable
Resistance, selection is so that the helix parameter of aerodynamic drag minimum is wound.
When aerodynamic drag calculates, for the suspension cable with circular cross section, reynolds number effect is problem needed to be considered.
In sub-critical Reynolds number region, resistance coefficient does not change substantially with the change of Reynolds number；In critical Reynolds number area, resistance system
Number reduces with the increase of Reynolds number.For the same suspension cable and identical air conditions, Reynolds number is directly proportional to wind speed,
Therefore in critical Reynolds number region, resistance coefficient reduces with the increase of wind speed, due to the quadratic sum of aerodynamic drag and wind speed
Resistance coefficient is directly proportional, and resistance coefficient reduces while wind speed increases so that the corresponding aerodynamic drag of maximum wind velocity is not necessarily
Maximum aerodynamic drag in entire wind speed range.Illustrate the computational methods of maximum aerodynamic drag below.
First, according to basic wind speed V10Or the design wind speed V at bridge sites10And the benchmark of stay cable of cable-stayed bridge is high
Degree, determines the wind speed V at altitude datum ZzWith quiet gustiness Vg。
Second, according to quiet gustiness VgWith average annual temperature, humidity, air pressure calculate suspension cable Reynolds number, Re=UD/ ν,
Wherein U is arrives stream wind speed, and unit m/s, D are suspension cable model diameter, and unit m, ν are air movement viscosity；ν=μ/ρ,
Middle ρ is the density of air, units/kg/m3, μ is air dynamic resistance viscosity.
Third, according to the parameter of suspension cable diameter and helix, and the Reynolds number numerical value that is calculated, by table 2-1,
Determine the region where Reynolds number.
Reynolds number subregion (the Reynolds number unit of table 2-1 winding different parameters helix suspension cables (a diameter of 90mm)：104)
Note："/" is the parameter combination without inhibition of vibration
4th, if quiet gustiness VgCorresponding Reynolds number is in close-to-critical range, and it is corresponding that the 3-1 that tables look-up obtains suspension cable
Resistance coefficient, and quiet gustiness V is calculated according to formula (1)gCorresponding aerodynamic drag, using counted aerodynamic drag as wind speed
From as low as VgMaximum aerodynamic drag in entire wind speed range.
Table 3-1 winds different parameters helix suspension cable (a diameter of 90mm) resistance coefficient statistical form
Note："/" is the parameter combination without inhibition of vibration
In formula：ρ-atmospheric density (kg/m3)
Vg- quiet gustiness
CDThe resistance coefficient of-stay cable of cable-stayed bridge
An- bridge stay cable down wind projected area (m2)；Its diameter is multiplied by its standoff height
5th, if the corresponding Reynolds numbers of quiet gustiness Vg are in critical zone, resistance coefficient is quasi- by biquadratic function
It closes formula (2) to calculate, parameter a, b, c, d, e in formula can be obtained by inquiry table 4-1.
CD=aRe4+bRe3+cRe2+dRe+e (2)
Table 4-1 winds different parameters helix suspension cable (a diameter of 90mm) resistance coefficient calculating parameter table
According to table 2-1, table 3-1 and formula (2), the corresponding C of critical zone Reynolds number is determinedD, determined in conjunction with the 4th step
The corresponding C of close-to-critical range Reynolds numberD, draw CDIt calculates and draws according to this curve and formula (1) with the change curve of Reynolds number
It is fast from as low as V with the wind to go out aerodynamic draggChange curve, the maximum aerodynamic drag in this curve is found, as wind speed from as low as Vg
Maximum aerodynamic drag in entire wind speed range.
6th, if quiet gustiness VgCorresponding Reynolds number is in supercritical region, straight according to suspension cable by table 3-1
Diameter determines the resistance coefficient of the corresponding supercritical region of suspension cable with winding different parameters helix suspension cable resistance coefficient statistical form,
The corresponding C of close-to-critical range Reynolds number determined respectively in conjunction with the 4th step, the 5th stepD, the corresponding C of critical zone Reynolds numberD, draw CD
With the change curve of Reynolds number, according to this curve and formula (1), calculates and draw out aerodynamic drag with wind speed from as low as VgChange
Change curve, the maximum aerodynamic drag in this curve is found, as wind speed from as low as VgThe pneumatic resistance of maximum in entire wind speed range
Power.
Other helix parameter combinations of vibration can be inhibited by reselecting, and repeat above-mentioned third to the 6th step, be obtained each
The maximum aerodynamic drag of suspension cable under group helix parameter, selects one group of helix parameter of maximum aerodynamic drag numerical value minimum,
Namely helix parameter combination when aerodynamic drag minimum, the helix parameter as optimization.
Embodiment 2
For the suspension cable of common diameter 120mm, in the case where winding bifilar helix, a diameter of 1.2mm of helix
In the case of can inhibit the maximum winding spacing that wind and rain shakes to be 6 times of suspension cable diameters；In the case of a diameter of 1.6mm of helix
It is 12 times of suspension cable diameters that can inhibit the maximum winding spacing that wind and rain shakes；It can press down in the case of a diameter of 2.0mm of helix
The maximum winding spacing that wind and rain processed shakes is 12 times of suspension cable diameters.
Table 1-2 can inhibit the different helix parameter combination tables that suspension cable (diameter 120mm) vibrates
| Spiral linear diameter d (mm) | 1.2 | 1.6 | 2.0 |
| Helical wound interval S (D) | 6 | 12 | 12 |
Studies have shown that under same parameter, individually increase the diameter of helix, equally there is inhibition of vibration；Individually subtract
Small winding spacing similarly has inhibition of vibration.Such as table 1, d=1.6mm, S=12D energy vibration suppressions, d=2.0mm, S=12D
Energy vibration suppression, d=1.6mm, S=6D also can vibration suppressions.
Calculate and select the process of the helix parameter of aerodynamic drag minimum with reference to embodiment 1, corresponding table see 2-2,
3-2、4-2。
Reynolds number subregion (the Reynolds number unit of table 2-2 winding different parameters helix suspension cables (a diameter of 120mm)：
104)
Table 3-2 winds different parameters helix suspension cable (a diameter of 120mm) resistance coefficient statistical form
Table 4-2 winds different parameters helix suspension cable (a diameter of 120mm) resistance coefficient calculating parameter table
Embodiment 3
Design parameter：For the suspension cable of common 160mm diameters, in the case where winding bifilar helix, helix is straight
Diameter can inhibit wind and rain to shake maximum winding spacing in the case of being 0.8mm is 12 times of suspension cable diameters；Helix is a diameter of
It is 14 times of suspension cable diameters that can inhibit the maximum winding spacing that wind and rain shakes in the case of 1.2mm.
Table 1-3 can inhibit the different helix parameter combination tables that suspension cable (diameter 160mm) vibrates
| Spiral linear diameter d (mm) | 0.8 | 1.2 |
| Helical wound interval S (D) | 12 | 14 |
Studies have shown that under same parameter, individually increase the diameter of helix, equally there is inhibition of vibration；Individually subtract
Small winding spacing similarly has inhibition of vibration.Such as table 1, d=0.8mm, S=12D energy vibration suppressions, d=1.2mm, S=12D
Energy vibration suppression, d=0.8mm, S=10D also can vibration suppressions.
Calculate and select the process of the helix parameter of aerodynamic drag minimum with reference to embodiment 1, corresponding table see 2-3,
3-3、4-3。
Reynolds number subregion (the Reynolds number unit of table 2-3 winding different parameters helix suspension cables (a diameter of 160mm)：
104)
Table 3-3 winds different parameters helix suspension cable (a diameter of 160mm) resistance coefficient statistical form
Table 4-3 winds different parameters helix suspension cable (a diameter of 160mm) resistance coefficient calculating parameter table
From the above embodiment test data comparison it is found that the diameter d for the helix that the suspension cable of different-diameter is wound and
Winding interval S is not exactly the same, and the suspension cable of different-diameter can obtain with inhibition of vibration while have minimum aerodynamic drag
Helix parameter, as the helix parameter of optimization, and select parameter in addition to this, can also reach the effect of vibration suppression
Fruit.
The present invention compared with prior art, has as follows significantly a little：
After suspension cable surface wrap bifilar helix, it can reach vibration suppression wind and rain by preventing continuous waterline formation and shake
Effect.After the helix parameter selected is wound as optimal helix, compared with the case where winding other helixes, suspension cable
Aerodynamic drag is minimum.
Claims (3)
1. a kind of parameter determination method of half parallel steel wire suspension cable of bifilar helix hot extruded polyethylene, which is characterized in that in oblique pull
The bifilar helix of protrusion is wound on the outer surface of rope (1) in the same direction；
The winding interval S of same helix is the integral multiple of suspension cable (1) diameter D；
The diameter D=90mm-160mm of suspension cable (1), the diameter d=0.8mm-2mm of helix (2) wind interval S=6D-
14D；
Wind the bifilar helix of different-diameter and different winding interval Ss in the same direction on the outer surface of the suspension cable (1) of same diameter,
By wind tunnel test, helix (2) the diameter d of aerodynamic drag minimum and winding interval S under the premise of inhibiting wind and rain to shake are determined
Combined for optimal parameter, optimal parameter combination be on the suspension cable (1) of same diameter helix (2) the diameter d that winds with
Wind interval S；
The determination of maximum aerodynamic drag：
First, according to basic wind speed V10Or the design wind speed V at bridge sites10And the altitude datum of stay cable of cable-stayed bridge, really
Determine the wind speed V at altitude datum ZzWith quiet gustiness Vg；
Second, calculate the Reynolds number of suspension cable according to quiet gustiness Vg and average annual temperature, humidity, air pressure, Re=UD/ ν, wherein
U is arrives stream wind speed, and unit m/s, D are suspension cable model diameter, and unit m, ν are air movement viscosity；ν=μ/ρ, wherein ρ
For the density of air, units/kg/m3, μ is air dynamic resistance viscosity；
Third, the Reynolds number numerical value obtained according to suspension cable diameter calculation, in conjunction with suspension cable diameter and winding different parameters spiral
The Reynolds number partition table of line suspension cable, determines the region where Reynolds number；
4th, if quiet gustiness VgCorresponding Reynolds number is in close-to-critical range, according to suspension cable diameter and winding different parameters
Helix suspension cable resistance coefficient statistical form determines the corresponding close-to-critical range resistance coefficient of suspension cable, and is calculated according to formula (1)
Quiet gustiness VgCorresponding aerodynamic drag, using counted aerodynamic drag as wind speed from as low as VgIn entire wind speed range most
Big aerodynamic drag；
In formula：ρ-atmospheric density, units/kg/m3
Vg- quiet gustiness
CDThe resistance coefficient of-stay cable of cable-stayed bridge
An- bridge stay cable down wind projected area m2；Its diameter is multiplied by its standoff height
5th, if quiet gustiness VgCorresponding Reynolds number is in critical zone, then resistance coefficient passes through biquadratic function fitting formula
(2) it calculates：
CD=aRe4+bRe3+cRe2+dRe+e (2)
The corresponding resistance coefficient of suspension cable and formula (2) are obtained according to experiment, determines the corresponding C of critical zone Reynolds numberD, in conjunction with
The corresponding C of close-to-critical range Reynolds number that 4th step determinesD, draw CDWith the change curve of Reynolds number, according to this curve and formula
(1), it calculates and draws out aerodynamic drag with wind speed from as low as VgChange curve, find the maximum aerodynamic drag in this curve,
As wind speed from as low as VgMaximum aerodynamic drag in entire wind speed range；
6th, if quiet gustiness VgCorresponding Reynolds number is in supercritical region, according to suspension cable diameter and winding different parameters
Helix suspension cable resistance coefficient statistical form determines the resistance coefficient of the corresponding supercritical region of suspension cable, in conjunction with the 4th step, the 5th
The corresponding C of close-to-critical range that step determines respectivelyD, the corresponding C of critical zone Reynolds numberD, draw CDWith the change curve of Reynolds number, root
Curve and formula (1) accordingly calculate and draw out aerodynamic drag with wind speed from as low as VgChange curve, find in this curve
Maximum aerodynamic drag, as wind speed from as low as VgMaximum aerodynamic drag in entire wind speed range；
With the suspension cable of same diameter, the helix parameter combination that can inhibit vibration is reselected, repeats above-mentioned third to the
Six steps obtain the maximum aerodynamic drag of suspension cable under each group helix parameter, select one group that maximum aerodynamic drag numerical value is minimum
Helix parameter combination when helix parameter combination namely aerodynamic drag minimum, the helix parameter combination as optimization.
2. the parameter determination method of half parallel steel wire suspension cable of bifilar helix hot extruded polyethylene as described in claim 1, special
Sign is that the wind tunnel test methods are as follows：The influence of development test wind speed, rainfall, inclination angle, wind angle first is found tiltedly
Parameter setting when drag-line is without helix when amplitude maximum；
Secondly, based on these parameters, successively wound on the suspension cable of same diameter different-diameter, different spacing spiral
Line investigates the influence of the winding interval S, diameter d of helix to inhibition of vibration, finding can press down under identical environmental condition
The different parameters combination shaken；And then these parameter combinations namely the winding interval S and diameter of helix are studied by dynamometer check
Influences of the d to aerodynamic drag, under the premise of meeting inhibition of vibration, corresponding spiral shell when selecting the aerodynamic drag minimum on suspension cable
The parameter combination of spin line, that is, aerodynamic drag minimum parameter combination；
Using identical method, for the suspension cable of different-diameter, the spiral with inhibition of vibration and optimum pneumatic resistance is found out
The parameter combination of line.
3. the parameter determination method of half parallel steel wire suspension cable of bifilar helix hot extruded polyethylene as described in claim 1, special
Sign is that the wind tunnel test carries out in the atmospheric boundary layer wind tunnel of wind1 tunnel laboratory, simulation of real scenes；The wind-tunnel is one
The double test sections of series connection return/direct current boundary layer wind tunnel, and slow-speed test section is 4.4 meters wide, 3 meters high, 24 meters long, and maximum wind velocity is more than 30
Meter per second；High-speed test (HST) section is 2.2 meters wide, 2 meters high, 5 meters long, and maximum wind velocity is more than 80 meter per seconds, and Flow Field Performance is good；Rainfall equipment
It is completed using the rainfall simulation system of custom-made, the rainfall simulation system is by that can realize the control system of open loop or closed-loop control
System, water system, spray system composition, wherein spray system by the 4 groups 12 different bores in different spatial spray
Head composition adjusts pressure by control system, can be with the drop of at different levels rainfall intensities of the accurate simulation from 10mm/h to 240mm/h
Rain, while being consistent with natural precipitation in terms of raindrop spectral property, the precision of rainfall intensity are 2%, the ranging from wide 4m of rainfall,
Down wind length 4m.
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| CN107059620A (en) * | 2017-04-13 | 2017-08-18 | 北京市第三建筑工程有限公司 | Prestressing force monaural drag-line and its method for stretching |
| CN109388912A (en) * | 2018-11-09 | 2019-02-26 | 石家庄铁道大学 | A kind of determination method, system and the terminal device of suspension cable aerodynamic drag |
| CN109446703B (en) * | 2018-11-09 | 2021-07-27 | 石家庄铁道大学 | Stay cable aerodynamic resistance determination method and device and terminal equipment |
| CN109241688B (en) * | 2018-11-09 | 2021-08-03 | 石家庄铁道大学 | Method and system for determining pneumatic resistance of stay cable and terminal equipment |
| CN111636292A (en) * | 2020-06-30 | 2020-09-08 | 湖南大学 | Pneumatic control device and method for inhaul cable high-order vortex vibration |
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