CN108692848A - The cable tension test method of complicated quality requirements downhaul - Google Patents
The cable tension test method of complicated quality requirements downhaul Download PDFInfo
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- CN108692848A CN108692848A CN201810568530.4A CN201810568530A CN108692848A CN 108692848 A CN108692848 A CN 108692848A CN 201810568530 A CN201810568530 A CN 201810568530A CN 108692848 A CN108692848 A CN 108692848A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L5/00—Apparatus for, or methods of, measuring force, work, mechanical power, or torque, specially adapted for specific purposes
- G01L5/04—Apparatus for, or methods of, measuring force, work, mechanical power, or torque, specially adapted for specific purposes for measuring tension in flexible members, e.g. ropes, cables, wires, threads, belts or bands
- G01L5/045—Apparatus for, or methods of, measuring force, work, mechanical power, or torque, specially adapted for specific purposes for measuring tension in flexible members, e.g. ropes, cables, wires, threads, belts or bands for measuring the tension across the width of a band-shaped flexible member
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- Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)
- Bridges Or Land Bridges (AREA)
Abstract
The invention discloses a kind of cable tension test methods of complicated quality requirements downhaul, cable tension test based on frequency method is most common method in arch bridge suspender cable tension test, in order to which suspender replacement facilitates stay cable end often to install anchorage, and the jack bound when tensioning further changes the dynamic characteristics of drag-line, this will cause Suo Li-frequency relation of drag-line that larger change occurs, to influence the precision that nominal frequencies method measures Suo Li.Present invention combination Practical Project studies influence of the jack mass action bound on stay cable end device and rope to its vibration characteristics, the Suo Li-frequency relation being fitted under the complexity quality and rigidity condition.Engineering test the result shows that, the relationship of stretching rope power and practical frequency with consider that Suo Li-frequency relation more coincide under complicated quality and rigidity condition, then differs greatly with conventional Suo Li-frequency relation, demonstrating the present invention, there are certain engineering values.
Description
Technical field
The present invention relates to Cable power technical field of measurement and test, and in particular to a kind of Suo Li surveys of complexity quality requirements downhaul
Method for testing, the frequency method for being related to stay cable end anchor set and the jack of binding measure Suo Li, that is, it is (non-to be directed to heterogeneous sunpender
Pulling anchor cable stage anchor set acts on, pulling anchor cable stage jack mass action and anchor set effect).
Background technology
Become today of bridge big country of the world in China, half through or through arch bridge is widely used.And sunpender conduct
Important Force transmission parts cause many bridge security accidents because being rusted or breaking etc..It is studied based on this many scholar,
Dragon jump has been made to summarize and has proposed corresponding maintenance measure to the disease of drag-line.Open the elegant detection of sunpender in pairs, maintenance is ground
Study carefully, proposes the suggestion replaced to dangerous sunpender.Sun Zhenhai studies the anchor set of sunpender, is proposed for hanging
Extruded anchoring tool is more applicable for the replacement agility of bar.Subsequent father-in-law's brightness et al. has studied Extrusion anchor ground tackle and arch bridge suspender is replaced
Peculiar advantage.And being widely used on sunpender with anchor set, the too complicated practical application of analytic method are relatively low, it is different
For many years to frequency method research, although there are many Practical Formula, mostly be the drag-line for specification to scholar;Existing FInite Element considers
It is larger that the Cable of end property grows the calculating of the Suo Li at 30m deviation.In addition the effect of jack is not both considered.
Currently, the present situation and deficiency of the research field are summarized as follows:
1, existing literature also only considers the effect of anchor set for heterogeneous sunpender, does not consider that pulling anchor cable stage is tied up
Prick the mass action of jack.
2, the FInite Element of existing heterogeneous sunpender is larger for the cable force measurement error of tackline, and the length of sunpender is most
It is shorter.
3, analytic method and the conventional finite element method are difficult to obtain accurate Suo Li frequency relations, and Suo Li frequency relations is accurate
Property directly affect actual measurement Suo Li accuracy.
Invention content
The purpose of the present invention is to solve drawbacks described above in the prior art, provide a kind of complicated quality requirements downhaul
Cable tension test method, this method combination Practical Project, using finite element software simulate stay cable end rigidity and quality be mutated.
Heterogeneous sunpender is established in finite element software first and obtains modified Suo Li frequency relations, reality is then obtained by practical frequency
Measuring rope power substantially increases the accuracy of cable tension test.
The purpose of the present invention can be reached by adopting the following technical scheme that:
A kind of cable tension test method of complexity quality requirements downhaul, the cable tension test method include the following steps:
S1, two models that heterogeneous sunpender (pulling anchor cable stage and non-pulling anchor cable stage) is established using FEM-software ANSYS,
Obtain corresponding Suo Li frequency relations.
S2, vibrating sensor is bound on drag-line, frequency-domain analysis is carried out to vibration signal, picks up each rank peak value of spectrogram
Frequency can be obtained each rank natural frequency of vibration of suspension cable.
S3, actual measurement Suo Li is determined by practical frequency by Interpolation Principle.
Further, the step S1, specific operation process are as follows:
(1) input and output for convenience are needed model parameter input and output result to be stored with array form, used
ARRAY numeric type arrays define, and using * DIM command definition array parameters, array parameter assignment is inputted using * SET orders.
(2) foundation of drag-line geometrical model and mesh generation, have anchorage dress for heterogeneous drag-line (non-pulling anchor cable stage) end
The drag-line set, the quality and rigidity of anchor set segment unit need to be set according to Practical Project, and structure is as shown in Figure 1;For non-equal
Matter drag-line (pulling anchor cable stage) is other than anchor set section considers, jack Duan Yin merely adds mass action, therefore jack Duan Dan
Member only needs to increase line density, and model is as shown in Figure 2.
(3) drag-line need to be considered by applying boundary condition and the numerical value of Suo Li, Suo Li.
(4) initial internal force calculates under Suo Li static(al)s effect, and there are self-balancings in the case where bearing dead weight and prestressing force effect by Yin Suo
State, therefore need to consider geometrical non-linearity.
(5) Suo Li frequency relations calculate, and kinematic analysis uses lumped mass matrix, and specifying equation solver, (EQSLV is ordered
Enable), prestressing force switch is opened, the frequency carried out under rope circuit power solves.
The finite element model of the different tensile states of two kinds of heterogeneous drag-line is as shown in Figure 3 and Figure 4.
Further, in the step S2, live frequency collection is as shown in figure 5, using dynamic signalling analysis instrument
(east China DHDAS5906), sensor use piezoelectric transducer, are generally carried out according to jack number of units when cable tension symmetrical same
Shi Zhangla can avoid influencing each other so to greatest extent, dynamic test set employed herein for different test environments,
The parameters such as sample frequency and channel information can be pre-set, testing ground can more the characteristics of measuring simultaneously.In addition spectrum analysis
It can be analyzed in real time or ex-post analysis, it is efficient to obtain pulling anchor cable stage drag-line frequency.
Further, in the step S3, linear interpolation principle is that the fields such as mathematics, computer graphics are widely used
A kind of simple interpolations method.The correspondence of Suo Li frequencies is obtained by step S1, such as (ω0,F0) and (ω1,F1), it to obtain
Dao [ω0,ω1]F values, that is, F=(ω-the ω of a certain measured value ω on straight line in section0)/(ω1-ω0)*(F1-F0)+F0。
(note:ω refers to practical frequency, ω0,ω1Refer to the frequency of FEM calculation, F refers to actual measurement Suo Li, F0,F1Refer to the rope that finite element applies
Power).
The present invention has the following advantages and effects with respect to the prior art:
1) the Suo Li frequency relation speed that finite element software calculates is fast, substantially increases the efficiency of cable tension test;
2) this technology application considers that drag-line or boom end anchor set and binding jack effect, Suo Li calculate accuracy
It is higher.
Description of the drawings
Fig. 1 is heterogeneous sunpender (non-pulling anchor cable stage) schematic diagram;
Fig. 2 is heterogeneous sunpender (pulling anchor cable stage) schematic diagram;
Fig. 3 is the FEM model schematic diagram of heterogeneous sunpender (non-pulling anchor cable stage);
Fig. 4 is the FEM model schematic diagram of heterogeneous sunpender (pulling anchor cable stage);
Fig. 5 is heterogeneous suspender tension stage frequency test schematic diagram;
Fig. 6 is finite element Suo Li-frequency relation cycle calculations flow chart;
Fig. 7 is sunpender various ways Suo Li result of calculation contrast schematic diagrams under different conditions.
Specific implementation mode
In order to make the object, technical scheme and advantages of the embodiment of the invention clearer, below in conjunction with the embodiment of the present invention
In attached drawing, technical scheme in the embodiment of the invention is clearly and completely described, it is clear that described embodiment is
A part of the embodiment of the present invention, instead of all the embodiments.Based on the embodiments of the present invention, those of ordinary skill in the art
The every other embodiment obtained without making creative work, shall fall within the protection scope of the present invention.
Embodiment
The present embodiment Main Basiss FEM-software ANSYS establishes heterogeneous drag-line, considers end rigidity and quality mutation
Under cable force measurement method, be as follows shown in:
R1, in cable tension, bind jack when measure its vibration frequency f1;
R2, after the completion of cable tension, measured when jack is laid down its vibration frequency f2;
R3, finite element establish drag-line whether there is or not model different under jack, when no jack modeling consider end anchorage
The diameter and line density of device have jack in addition to considering anchor set, also need to consider the increased line density of jack section, to
Different Suo Li frequency relations are calculated;
R4, the frequency f according to actual measurement1And f2It substitutes into different Suo Li frequency relations and calculates rope force value, since jack is bound
Front and back rope force value is constant, therefore the rope force value deviation calculated will not be very big.
It is as shown in table 1 that further verification, sunpender parameter now are made to the present invention by taking the heterogeneous sunpender of prosperous bridge as an example.
1. heterogeneous sunpender parameter list of table
For step R1, R2, now analyzed with the Suo Li measured values before and after the heterogeneous suspender tension of prosperous bridge, it is non-equal
Matter sunpender is whether there is or not the practical frequency under jack tension is as shown in table 2
The prosperous booms on large bridge parameter of table 2.
For step R4, in terms of this technology finite element Suo Li under the identical Suo Li states of heterogeneous drag-line difference tensile state
It calculates result to compare, different calculation methods Suo Li calculated values of practical frequency under different tensile states are as shown in table 3.
The prosperous bridge of table 3. surveys rope force value
Wherein △1=(T1-T2)/T2, △2=(T3-T4)/T4, △3=(T3-T1)/T1, △4=(T4-T2)/T2, T1For f1
Frequency is based on the Suo Li of heterogeneous drag-line (pulling anchor cable stage) FEM calculation;T2For f2Frequency is based on heterogeneous drag-line (non-tensioning rank
Section) FEM calculation Suo Li;T3For f1The Suo Li that frequency is calculated based on uniform drag-line;T4For f2Frequency is based on uniform drag-line meter
The Suo Li of calculation.
Upper table two kinds of practical frequencies under drag-line different conditions are based on different model result of finite element and compare such as Fig. 7 institutes
Show, it can be seen that:1) the Suo Li T calculated based on this paper models1And T2As a result it approaches, within ± 10%, maximum deviation is deviation
9.8%;2) the Suo Li T that practical frequency is calculated based on uniform Cable power-frequency relation3And T4Deviation is larger, and deviation exists
12%~86% range, the wherein deviation of tackline are maximum, and the Suo Li deviations of wd1 have reached 85.8%, as rope is grown from 5.481m
13.460m is gradually risen to, the deviation ratio of Suo Li significantly decreases;3) f is measured based on the cable tension stage1Sheet used
Literary method scrapes the Suo Li result errors of mud calculating in 22%~92% range, the Suo Lishou of tackline with uniform Cable power-frequency
The influence arrived is more notable, and maximum deviation reaches 91.1%, and with the increase that rope is grown, deviation ratio is declined, but minimum inclined
Poor ratio also reaches 22.8%, is still unacceptable deviation amplitude for the cable force measurement in Practical Project;4) it is based on drag-line
Pulling anchor cable stage measures f2Context of methods used and uniform drag-line model Suo Li result of calculations deviation in 6%~45% range,
Increase deviation with rope length reduces.
The rope that the finite element model established by two different phases (whether there is or not jack) of heterogeneous drag-line is calculated
Force value deviation is smaller, shows under identical Suo Li, different boundary conditions, and the deviation of computational methods provided herein is smaller,
Result of calculation closure degree is higher, there is certain application value;The presence or absence of Suo Li frequency relations calculating using homogeneous drag-line thousand
Suo Li result error ranges in the case of jin top are big, show Suo Li-frequency of the presence or absence to drag-line of jack and anchorage
Rate relationship has larger change, in particular for tackline, if carried out to it using Suo Li-frequency relation of traditional uniform drag-line
It calculates, the required precision in engineering cannot be met;Based on the frequency profit measured in heterogeneous cable tension stage (having jack)
The Suo Li result errors calculated with context of methods and homogeneous drag-line model change greatly, and based in the non-pulling anchor cable stage of heterogeneous drag-line
The Suo Li result errors that the frequency utilization context of methods that (no jack) measures is calculated with homogeneous drag-line model are slightly smaller compared with, table
It is bright for tackline, it is necessary to consider end anchorage device and jack effect, just can obtain accurately and reliably cable tension test as a result, anchor
It is smaller to the influence of end effect of long rope to have device, but jack effect still be can not ignore.
It, can be in conclusion FEM-software ANSYS has convenient, rapid characteristic in Suo Li-frequency analysis of rope
The file of programming is directly read, and file is written in result of calculation, has not only facilitated the modification of original program, but also is facilitated to calculating number
According to processing.The result of model analysis can be by simply recycling in the frequency write-in array needs, and each Suo Li changes
Or the change of rope length can reload calculating by case-deleted models by obtain, and because analyze speed is very fast every time, several
Different Suo Li-frequency relations (thousands of a data) of the rope of different length can also calculate completion as long as more than ten minutes.Based on having
One group of Suo Li of cycle of limit meta software ANSYS obtains a set of frequencies, and one group of rope of cycle is grown to obtain one group of Suo Li, and obtained number
Set form is output to ' order ' file according to this, as shown in Figure 6.
The above embodiment is a preferred embodiment of the present invention, but embodiments of the present invention are not by above-described embodiment
Limitation, it is other it is any without departing from the spirit and principles of the present invention made by changes, modifications, substitutions, combinations, simplifications,
Equivalent substitute mode is should be, is included within the scope of the present invention.
Claims (6)
1. a kind of cable tension test method of complexity quality requirements downhaul, which is characterized in that the cable tension test method includes
The following steps:
S1, heterogeneous sunpender is established respectively in two models of pulling anchor cable stage and non-pulling anchor cable stage, obtain corresponding Suo Li frequencies
Relationship;
S2, vibrating sensor is bound on drag-line, frequency-domain analysis is carried out to vibration signal, picks up each rank crest frequency of spectrogram
It can be obtained each rank natural frequency of vibration of drag-line;
S3, actual measurement Suo Li is determined by practical frequency by Interpolation Principle.
2. the cable tension test method of complexity quality requirements downhaul according to claim 1, which is characterized in that the step
In rapid S1, established respectively using FEM-software ANSYS heterogeneous sunpender pulling anchor cable stage and non-pulling anchor cable stage two models,
Obtain corresponding Suo Li frequency relations.
3. the cable tension test method of complexity quality requirements downhaul according to claim 2, which is characterized in that the step
Rapid S1 processes are as follows:
Model parameter input and output result are stored with array form, defined using ARRAY numeric type arrays, is ordered using * DIM
Order is defined arrays parameter, and * SET orders is used to input array parameter assignment;
Drag-line geometrical model is established and mesh generation has end on the heterogeneous drag-line of anchor set, anchor in non-pulling anchor cable stage
The quality and rigidity for having device segment unit need to be set according to Practical Project;In non-pulling anchor cable stage, for heterogeneous drag-line in addition to anchor
It is outer to have the consideration of device section, jack Duan Yin merely adds mass action, therefore jack segment unit only needs to increase line density;
Apply boundary condition and Suo Li, Suo Li range and uses formula according to a preliminary estimate using analytic method;
Initial internal force calculates under Suo Li static(al) effects, Yin Lasuo in the case where bearing dead weight and prestressing force effect there are self-balancing state,
Therefore it needs to consider geometrical non-linearity;
Suo Li frequency relations calculate, and kinematic analysis uses lumped mass matrix, specify equation solver, open prestressing force switch,
The frequency carried out under rope circuit power solves.
4. the cable tension test method of complexity quality requirements downhaul according to claim 1, which is characterized in that the step
In rapid S2, in cable tension, the frequency f of its vibration is measured when binding jack1, after the completion of cable tension, jack unloads
The frequency f of its vibration is measured when falling2, finite element establishes drag-line whether there is or not using different models under jack, when no jack
Modeling considers the diameter and line density of end anchorage device, has jack in addition to considering anchor set, also needs to consider jack section
Increased line density, to which different Suo Li frequency relations be calculated.
5. the cable tension test method of complexity quality requirements downhaul according to claim 1, which is characterized in that the step
In rapid S2, using dynamic signalling analysis instrument, wherein dynamic signalling analysis instrument, can be pre- for different test environments
First sample frequency is set and channel information parameter, testing ground are measured simultaneously using more;
Sensor uses piezoelectric transducer, carries out symmetrical simultaneous tension according to jack number of units when cable tension.
6. the cable tension test method of complexity quality requirements downhaul according to claim 1, which is characterized in that the step
In rapid S3, the correspondence of Suo Li frequencies is obtained by step S1 in advance:(ω0,F0) and (ω1,F1), then get Dao [ω0,
ω1]The F values of a certain measured value ω on straight line in section, i.e. F=(ω-ω0)/(ω1-ω0)*(F1-F0)+F0, wherein ω
Refer to practical frequency, ω0,ω1Refer to the frequency of FEM calculation, F refers to actual measurement Suo Li, F0,F1Refer to the Suo Li that finite element applies.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| 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 |
| CN113218556A (en) * | 2021-04-20 | 2021-08-06 | 广西大学 | Weight fixing device and method for measuring cable force of short cable by using weight |
| CN113322810A (en) * | 2021-04-22 | 2021-08-31 | 西北工业大学 | Debugging and installing system and method for stay cable of anti-seismic support |
| CN114878053A (en) * | 2022-06-02 | 2022-08-09 | 辽宁省交通高等专科学校 | Novel high accuracy cable force device of piezoelectric type |
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