CN116227002A - Protection method for homodromous rotary inhaul cable - Google Patents
Protection method for homodromous rotary inhaul cable Download PDFInfo
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- 238000005299 abrasion Methods 0.000 description 9
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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
- E01D11/00—Suspension or cable-stayed bridges
- E01D11/04—Cable-stayed bridges
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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
- E01D19/14—Towers; Anchors ; Connection of cables to bridge parts; Saddle supports
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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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- G06F2119/04—Ageing analysis or optimisation against ageing
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Abstract
The invention discloses a protection method of a homodromous rotary inhaul cable, which has longitudinal rigidity and changes direction through a friction type or clamping type saddle, and comprises the following steps: the method comprises the steps of decomposing complex local radial force formed by a cable at the arc end into conventional radial distribution force and additional radial distribution force couple, superposing dual radial distribution force of the conventional radial distribution force and the additional radial distribution force couple based on relation analysis of the additional radial distribution force couple and the conventional radial distribution force, and determining a radial pressure concentration zone as a key protection zone of the homodromous rotary cable.
Description
Technical Field
The invention relates to the technical field of civil engineering, in particular to a protection method of a homodromous rotary inhaul cable.
Background
With the development of cable structure types and the improvement of physical properties, deflection cables are increasingly used in structural engineering, such as longitudinal tower-passing cables on short-tower cable-stayed bridges, external cables in prestressed concrete beams, homodromous rotary cables developed on conventional cable-stayed bridges in recent years, and the like. The cable is generally deflected by various types of saddle, and when a friction or clamping saddle is used, fretting wear occurs at the saddle bend, especially at the end of the saddle bend where the amount of fretting is large. If left uncontrolled, fatigue fracture due to abrasion will occur quickly at the end of the curved segment.
The abrasion fatigue theoretical model which is proposed earlier and measures the abrasion degree by the friction work is researched, the abrasion fatigue of the inhaul cable is independent of the radius and the rotation angle, and the principle of stress amplitude master control is utilized, so that the factor control problem of protecting inhaul cable deflection is primarily solved.
Because the inhaul cable has certain longitudinal rigidity, the conversion from the bending to the bending can be completed not only by the radial distribution force of the conventional cognition, but also by overcoming the longitudinal rigidity by an additional bending moment of the arc end part. Since the additional bending moment at the end of the curve is derived from a pair of opposite radial pressure forces along the cable, the two effects, when superimposed, will form a localized radial pressure concentration zone at the end of the curve. The stress of the inhaul cable in the area is more unfavorable, abrasion is increased, and important protection is needed. Therefore, the problems of the protection degree and the protection point for protecting the deflection inhaul cable are further solved, and the protection degree and the protection point are very necessary.
Disclosure of Invention
In view of the above-mentioned problems of the prior art, the present invention proposes a protection method for a co-rotating cable, which changes its direction by means of a friction-type or clamping-type saddle, and causes fretting abrasion in the bent section, possibly causing fatigue fracture. The protection method provides the radial distribution force value and the maximum radial distribution force position which consider the longitudinal rigidity for the cable deflection arc end, and solves the problems of protection degree and protection point for protecting cable deflection. In the technical scheme, the stress requirement of the inhaul cable with certain longitudinal rigidity for conversion from the bending is studied, and the complex radial distribution force formed at the end part of the arc line is decomposed into two simplified parts: first, the conventional radial distribution force q 1 Secondly, an additional radial distribution couple q for overcoming the longitudinal rigidity of the inhaul cable by an additional bending moment is formed 2 . The invention provides a protection method of a homodromous rotary inhaul cable, which comprises the following steps:
(1) Obtaining the conventional radial distribution force q of the inhaul cable at the end part of the arc line 1 ；
In this step of the process, the process is carried out,
wherein T is ae For the guy cable to longitudinally pull at the end of the arc line, R ae Is the bending radius of the guy cable at the end of the arc.
(2) Based on conventional radial distribution force q 1 And an additional radial distribution couple q 2 Acquiring additional distribution couple q of inhaul cable at arc end 2 The additional radial distribution couple is that the same-direction rotary inhaul cable is driven to be straightThe additional bending moment created in the transition to bending overcomes the longitudinal stiffness of the cable, it being understood that an additional radial distribution couple q is assumed 2 The action interval at the arc end part is 0 to 2a from the cable arc end part ae Then add a radial distribution couple q 2 Wherein a force near the end of the arc is equal to the normal radial distribution force q 1 In the opposite direction of the other force from the normal radially distributed force q 1 In the same direction, i.e. at a distance from cable curve end 0 to a ae Within the interval of (a), add radial distribution couple q 2 Is a force of (1) and a normal radial distribution force q 1 The directions are opposite; at a distance from the cable arc end a ae To 2a ae Within the interval of (a), add radial distribution couple q 2 Is a further force of (a) and a conventional radial distribution force q 1 In the same direction, i.e. at a distance from the cable arc end a ae To 2a ae In the section of the section, double radial distribution forces are overlapped, so that the abrasion fatigue of the section is aggravated, and the section is a section needing important protection.
In this step, a conventional radial distribution force q 1 And an additional radial distribution couple q 2 The relation of (2) is: q 2 ＝q 1 。
(3) Based on conventional radial distribution force q 1 And an additional radial distribution couple q 2 And (3) overlapping the dual radial distribution force, and determining a radial pressure concentration zone as a key protection zone of the homodromous rotary inhaul cable.
In the step, the key protection section of the homodromous rotary inhaul cable is a distance from the arc end part a of the inhaul cable ae To 2a ae Is used in the range of (a),
wherein sigma ae For the longitudinal tensile stress of the cable at the ends of the curve, < + >>
A ls Is the cross-sectional area of the inhaul cable; r is (r) ls The radius of gyration of the section of the inhaul cable.
According to the invention, a dual radial distribution force analysis method considering longitudinal rigidity is adopted for the arc end part of the homodromous rotary inhaul cable, so that the accurate positioning of a local radial pressure concentration area formed at the arc end part after the superposition of two actions is realized, and the problems of the protection degree and the protection point for protecting the deflection inhaul cable are solved.
Specifically, q in the above (2) 1 And q 2 The acquisition method of the relation of (1) comprises the following steps:
based on q 2 And q 1 The superposition of (2) should be such that at q 2 Density E of cable extrusion deformation energy generated in distribution section ae Highest solution q 2 The value of q is 2 The distribution interval is 0 to 2a from the arc end of the guy cable ae Specifically, the step includes:
(21) Obtaining an end energy density equation:
E ae ＝m ae [(q 1 -q 2 ) 2 +(q 1 +q 2 ) 2 ]，
wherein m is ae Parameters related to the characteristics of the inhaul cable material, the cross-sectional shape and the like;
(22) Solving for end energy Density E ae Maximum time q 2 Is the value of (1):
deriving the formula in (21),
i.e. along with q 2 Increased compression set energy E ae Also increasing, the constraint q is obtained based on the impossibility of disengaging the end of the cable arc from the saddle 2 ≤q 1 Obtaining q 2 ＝q 1 Therefore, the stress decomposition and the force calculation of the deflection inhaul cable at the end part of the arc line are realized.
Specifically, the parameter a of the important guard interval of the corotation cable in (3) above ae The acquisition method of (1) comprises the following steps: stress balance solving a based on arc end under additional radial distribution couple effect ae The method specifically comprises the following steps:
(31) The bending radius at the arc end of the guy cable is R ae Moment of couple M at the end of the time curve ae The method comprises the following steps:
M ae ＝E ls I ls y″ (1)
wherein E is ls For the elastic modulus of the inhaul cable, I ls The longitudinal rigidity of the inhaul cable is that y' is the curvature of the arc end part of the inhaul cable;
(32) By means of
q 2 ＝q 1 ，
I ls ＝A ls r ls 2 Substituting the above formulae (1) and (2) to obtain a ae Relation with modulus of elasticity of the cable, longitudinal tensile stress of curved end, radius of gyration of section of cable, i.e. above +.>
The protection method of the homodromous rotary inhaul cable has the following beneficial effects:
1. according to the invention, a dual radial distribution force analysis method considering longitudinal rigidity is adopted for the arc end part of the homodromous rotary inhaul cable, so that the accurate positioning of a local radial pressure concentration area formed at the arc end part after the superposition of two actions is realized, the quantitative and accurate protection is implemented, and the problems of the protection degree and the protection point for protecting the deflection inhaul cable are solved.
2. Based on the highest criterion of the extrusion deformation energy density of the cable arc end, a double radial distribution force decomposition mode considering the longitudinal rigidity and a calculation formula thereof are provided, and a cable deflection abrasion fatigue theoretical model of the system is formed.
3. The cable deflection protection device solves the problems of protection degree and protection point for protecting cable deflection, and provides innovative technical support for popularizing and applying cable deflection technology and simplifying cable system design.
4. Promotes the innovation of the inhaul cable system and the development of the structural technology, and achieves remarkable technical effects and economic and social effects.
Drawings
FIG. 1 is a schematic diagram of a novel yaw cable-the co-rotating cable layout;
FIG. 2 is a schematic diagram of a novel yaw cable-the co-rotating cable structure;
FIG. 3 is a schematic view of the arc end of the novel yaw cable-the co-rotating cable.
In the figure: 1-deflecting a guy cable; 2-a clamping saddle; 3-cable towers; 4-arc end; 5-single steel strand.
Detailed Description
The invention will now be described in detail with reference to the drawings and specific examples. The following examples are given on the premise of the technical scheme of the present invention, and detailed embodiments, specific operation processes and quantitative calculation results are given, but the protection scope of the present invention is not limited to the following examples.
Referring to fig. 1, in order to fundamentally solve the problem of cracking of the traditional anchor cable of the cable tower and reduce the materials and the manufacturing cost of the anchor cable of the cable tower, the design provides a novel deflection cable 1, namely a homodromous rotary cable, which deflects and anchors at a large angle on a cable tower 3 through a clamping type saddle 2.
Referring to fig. 2, the deflection cable 1 is composed of 22 steel strands and is pulled longitudinally at the curved end 4
T ae ＝2200KN，R ae =2m. Modulus of elasticity E of the material ls ＝1.95×10 5 MPa, longitudinal tensile stress sigma at the ends of the arc ae =720 MPa, single steel strand 5 section radius of gyration r ls ＝4.5mm。
Referring to fig. 3, the complex localized radial pressure developed by the deflection cable 1 at the curved end 4 can be broken down into a conventional radial distribution force q 1 Additional radial distribution couple q 2 。q 1 、q 2 Q 2 Distribution interval 2a ae The calculation is carried out by adopting a formula based on the highest criterion of the extrusion deformation energy density of the cable arc end:
q 1 ＝2200/2＝1100kN/m；
q 2 ＝q 1 ＝1100kN/m；
referring to fig. 3, the above calculation result can accurately determine that the magnitude of the superimposed two radial distribution forces acting on the cable reaches 2200kN/m from 74.1mm to 148.2mm away from the cable arc end 4, which is doubled compared with the conventional calculation, so that the abrasion fatigue is aggravated, and the section requiring important protection is provided.
The cable deflection digital model solves the problems of the protection degree and the protection point of the novel deflection cable, namely the same-direction rotation cable, and supports innovation of a cable system and development of a structural technology.
The present invention is not limited to the above-described specific embodiments, and various modifications may be made by those skilled in the art without inventive effort from the above-described concepts, and are within the scope of the present invention.
Claims (9)
1. A method of protecting a co-rotating cable, wherein the deflecting cable has a longitudinal stiffness and is redirected by a friction or clamp saddle, the method comprising:
(1) Obtaining the conventional radial distribution force q of the inhaul cable at the end part of the arc line 1 ；
(2) Based on conventional radial distribution force q 1 And an additional radial distribution couple q 2 Acquiring additional distribution couple q of inhaul cable at arc end 2 The additional radial distribution couple is generated by overcoming the longitudinal rigidity of the cable by an additional bending moment formed in the conversion of the same-direction rotary cable to the bending moment;
(3) Based on conventional radial distribution force q 1 And an additional radial distribution couple q 2 And (3) overlapping the dual radial distribution force, and determining a radial pressure concentration zone as a key protection zone of the homodromous rotary inhaul cable.
2. The method for protecting a co-rotating cable according to claim 1, wherein,
q in the above (1) 1 The method comprises the following steps:
wherein T is ae For the guy cable to longitudinally pull at the end of the arc line, R ae Is the bending radius of the guy cable at the end of the arc.
3. The method of claim 1, wherein the force q is distributed in a radial direction in the step (2) 1 And an additional radial distribution couple q 2 The relation of (2) is: q 2 ＝q 1 。
4. The method for protecting a co-rotating cable according to claim 1, wherein q in (2) 1 And q 2 The acquisition method of the relation of (1) comprises the following steps:
based on q 2 And q 1 The superposition of (2) should be such that at q 2 Density of cable extrusion deformation energy generated in distribution section E ae Highest solution q 2 The value of q is 2 The distribution interval is 0 to 2a from the arc end of the guy cable ae Is defined in the above-described specification.
5. The method for protecting a co-rotating cable according to claim 4, wherein q in (2) 1 And q 2 The acquisition method of the relation of (1) comprises the following steps:
(21) Obtaining an end energy density equation:
E ae ＝m ae [(q 1 -q 2 ) 2 +(q 1 +q 2 ) 2 ]，
wherein m is ae Parameters related to the characteristics of the inhaul cable material, the cross-sectional shape and the like;
(22) Solving for end energy Density E ae Maximum time q 2 Is a value of (2).
6. The method for protecting a co-rotating cable according to claim 5, wherein the end energy density E is determined in (22) ae Maximum time q 2 Comprises: at q 2 ≤q 1 Solving q for constraint 2 。
7. The method for protecting a co-rotating cable according to claim 1, wherein,
the key protection section of the homodromous rotary inhaul cable in the step (3) is a distance from the arc end part a of the inhaul cable ae To 2a ae Is used in the range of (a),
wherein sigma ae For the longitudinal tensile stress of the cable at the ends of the curve, < + >>
A ls Is the cross-sectional area of the inhaul cable; r is (r) ls The radius of gyration of the section of the inhaul cable.
8. The method for protecting a co-rotating cable according to claim 7, wherein the parameter a of the important protection zone of the co-rotating cable is ae The acquisition method of (1) comprises the following steps:
stress balance solving a based on arc end under additional radial distribution couple effect ae 。
9. The method for protecting a co-rotating cable according to claim 8, wherein the parameter a of the important protection zone of the co-rotating cable is ae The acquisition method of (1) comprises the following steps:
(31) The bending radius at the arc end of the guy cable is R ae Moment of couple M at the end of the time curve ae The method comprises the following steps:
M ae ＝E ls I ls y″ (1)
(32) By means of
Substituting the above formulae (1) and (2) to obtain a ae And the elastic modulus of the inhaul cable, the longitudinal tensile stress of the arc end part and the radius of gyration of the cross section of the inhaul cable. />
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| CN202310334945.6A CN116227002B (en) | 2023-03-31 | 2023-03-31 | Protection method for homodromous rotary inhaul cable |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2062050A (en) * | 1979-10-31 | 1981-05-20 | Ici Ltd | Protective building structures |
| CN103669208A (en) * | 2013-12-05 | 2014-03-26 | 东南大学 | Anchoring method applicable to large-tonnage FRP inhaul cable |
| CN110258329A (en) * | 2019-06-13 | 2019-09-20 | 中铁大桥科学研究院有限公司 | A kind of FRP inhaul cable anchor and its installation method |
| CN112100713A (en) * | 2020-08-18 | 2020-12-18 | 东南大学 | Cable force automatic identification method based on variable-pitch grid |
| CN112985671A (en) * | 2021-02-23 | 2021-06-18 | 中冶建筑研究总院有限公司 | Damage judgment method based on full-cable-system cable force test and error adaptive analysis |
| CA3213133A1 (en) * | 2021-08-31 | 2023-03-09 | Ls Cable & System Ltd. | Optical cable |
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Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2062050A (en) * | 1979-10-31 | 1981-05-20 | Ici Ltd | Protective building structures |
| CN103669208A (en) * | 2013-12-05 | 2014-03-26 | 东南大学 | Anchoring method applicable to large-tonnage FRP inhaul cable |
| CN110258329A (en) * | 2019-06-13 | 2019-09-20 | 中铁大桥科学研究院有限公司 | A kind of FRP inhaul cable anchor and its installation method |
| CN112100713A (en) * | 2020-08-18 | 2020-12-18 | 东南大学 | Cable force automatic identification method based on variable-pitch grid |
| CN112985671A (en) * | 2021-02-23 | 2021-06-18 | 中冶建筑研究总院有限公司 | Damage judgment method based on full-cable-system cable force test and error adaptive analysis |
| US20230003595A1 (en) * | 2021-02-23 | 2023-01-05 | Central Research Institute Of Building And Construction Co., Ltd. Mcc | Damage identification method based on cable force tests of cable system and test error self-adaptive analysis |
| CA3213133A1 (en) * | 2021-08-31 | 2023-03-09 | Ls Cable & System Ltd. | Optical cable |
Non-Patent Citations (1)
| Title |
|---|
| 黄宇翔;: "关于斜拉桥斜拉索弯曲应力及其控制对策分析", 交通世界, no. 36, 25 December 2016 (2016-12-25), pages 44 - 49 * |
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