CN107014543A - A kind of cord force of cable-stayed bridge method of testing - Google Patents
A kind of cord force of cable-stayed bridge method of testing Download PDFInfo
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- CN107014543A CN107014543A CN201710301150.XA CN201710301150A CN107014543A CN 107014543 A CN107014543 A CN 107014543A CN 201710301150 A CN201710301150 A CN 201710301150A CN 107014543 A CN107014543 A CN 107014543A
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- cable
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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
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Abstract
The invention discloses a kind of cord force of cable-stayed bridge method of testing, it is related to bridge machinery field, comprises the following steps：S1, the obliquity sensor for obtaining automatic detection device obliquity information in real time and the mileage coder for obtaining automatic detection device positional information in real time are installed on bridge cable automatic detection device；S2, walked on suspension cable using bridge cable automatic detection device, multigroup positional information x is obtained by mileage coder1、x2…xn, obtained and the one-to-one multigroup angle information y ' of the positional information by obliquity sensor1、y′2…y′n；S3, positional information and angle information the calculating drag-line sag by measuring；S4, pass through drag-line sag calculate stay cable force.The cord force of cable-stayed bridge method of testing of the present invention can accurately measure Suo Li by drag-line sag, can improve Suo Li measurement accuracy and reliability, automaticity, reduce dependence of the cable force measurement to engineering experience and testing staff's technical merit.
Description
Technical field
The present invention relates to bridge machinery field, and in particular to a kind of cord force of cable-stayed bridge method of testing.
Background technology
With the development that China traffic base is built, the bridge construction accounting among the railway network and network of highways is very high, bridge
Beam must take hundreds of meters or even upper km when across river, valley, existing traffic route and other kinds specific buildings
Large span cable system bridge, and cable-stayed bridge occupies leading position due to its economy in Longspan Bridge.
During the periodic detection of cable-stayed bridge operation phase is assessed, the cable force measurement of suspension cable is exactly a very important content,
Suo Li test mainly has around-France pressure, magnetic flux method and Spectrum Method in the prior art.Pressure is around-France to be drawn when being bridge construction
Rope and anchored end lay pressure rings, measure the pressure suffered by pressure rings to calculate Cable power by fiber-optic grating sensor, but
The stress of pressure rings is circumferentially continuous scattered, if the axial direction by the discrete strain done to estimate suffered by whole pressure rings
Power is influenced by many factors；The sensor that magnetic flux method is used is made up of two layers of coil, and a circle is hot-wire coil, what it was produced
Electromagnetic field will magnetize drag-line, and magnetized drag-line magnetic field can produce induced electromotive force, its induction electric to another coil of sensor
Gesture and the internal stress of drag-line are more sensitive, by demarcating this relation, it is possible to monitor the change of the stress of rope.The advantage of this method
It is it in addition to drag-line is magnetized, any mechanics and physical characteristic of drag-line is not influenceed, it is however a drawback of the method that must scene mark
It is fixed and very big by the interference of temperature field, electromagnetic field, it should not be used in railway guy system bridge, and also it is costly；Frequency spectrum
It, using a kind of universal method in current bridge cable cable tension test, is specially that acceleration transducer is laid on rope, so that method, which is,
Afterwards by artificial or environmental excitation, the vibration frequency of rope is obtained, recycles vibration frequency and Suo Li simplification formula to make approximate place
Reason obtains Suo Li.But Spectrum Method this assumes that drag-line pin-ended, ignores the influence of sag, for being largely mounted with vibration damping
The drag-line of device also have ignored the influence of shock absorber.Therefore its measured result can not directly obtain accurate Suo Li, it is necessary to according to warp
Test and estimated, some drag-line same time, repeatedly measurement can obtain different as a result, it is desirable to binding isotherm parameter and engineering
Experience Comprehensive Evaluation.
Bridge stay cable must have certain sag because of Action of Gravity Field, and sag and Suo Li are the presence of strict corresponding relation
, it can be precisely calculated Suo Li sizes by measuring sag.But high-altitude is in the middle part of drag-line, the measurement of sag is difficult to realize,
Also it is difficult to accurately measure Suo Li by setting out.
The content of the invention
For defect present in prior art, it is an object of the invention to provide a kind of cord force of cable-stayed bridge method of testing,
By application bridge cable automatic detection device directly measuring setting out measures Suo Li, Suo Li measurement essence can be improved
Degree and reliability, automaticity, reduce dependence of the cable force measurement to engineering experience and testing staff's technical merit.
To achieve the above objectives, the present invention is adopted the technical scheme that：
A kind of cord force of cable-stayed bridge method of testing, is implemented using the bridge cable automatic detection device that can be creeped along suspension cable,
This method comprises the following steps：
S1, offer one have obliquity sensor and the bridge cable automatic detection device of mileage coder；
S2, walked on suspension cable using bridge cable automatic detection device, positional information collected by mileage coder,
Angle information corresponding with the positional information is collected by obliquity sensor；
S3, positional information and angle information the calculating drag-line sag by measuring；
S4, pass through drag-line sag calculate stay cable force.
On the basis of above-mentioned technical proposal, in the step S2, multigroup positional information x is collected by mileage coder1、
x2…xn, collected and the one-to-one multigroup angle information y ' of the positional information by obliquity sensor1、y′2…y′n。
On the basis of above-mentioned technical proposal, the step S3 specifically includes following steps：
S31, bridge stay cable institute planar, reference frame and mathematical modeling are set up, by the line of bridge stay cable
Shape is set as conic section, lists the functional relation of the positional information and the angle information；
S32, the functional equation by the multigroup positional information of simultaneous and the angle information, obtain the positional information
With the physical relationship formula of the angle information；
The maximum sag of S33, the maximum for trying to achieve bridge stay cable bias, i.e. bridge stay cable.
On the basis of above-mentioned technical proposal, the step S3 specifically includes following steps：
S301, bridge stay cable institute planar, with bridge stay cable bottom anchor point position origin, with suspension cable top
The line of anchor point and bottom anchor point be x-axis set up plane right-angle coordinate, by bridge stay cable it is linear be set as it is secondary
Curve：
Y=ax2+bx
Then the angle change function of drag-line is
Y '=2ax+b
S302, by solving following linear equation in two unknowns group obtain a, b：
S303, the maximum for trying to achieve yThat is the maximum sag of bridge stay cable.
On the basis of above-mentioned technical proposal, the Suo Li F of the step S4 Bridge suspension cables are especially by below equation
Calculate：
Wherein, α is the angle of bridge stay cable and bridge floor, and q is the deadweight in bridge stay cable unit length, and L is bridge
The effective length of suspension cable.
On the basis of above-mentioned technical proposal, the effective length L of bridge stay cable subtracts two anchoring for the overall length of drag-line
The length in area.
On the basis of above-mentioned technical proposal, in the step S4, before the effective length L of bridge stay cable is calculated,
Judge whether bridge stay cable is provided with shock absorber, if it has not, then calculating as stated above；If any then having calculating drag-line
When imitating length L, the length and shock absorber of two anchorage zone are subtracted with the overall length of drag-line to the guy cable length between bridge floor anchorage zone
Sum.
Compared with prior art, the advantage of the invention is that：
(1) cord force of cable-stayed bridge method of testing of the invention is led to by the accurate measurement to setting out and correlation computations
Cross drag-line sag and accurately measure Suo Li, Suo Li measurement accuracy and reliability, automaticity can be improved, reduce cable force measurement
Dependence to engineering experience and testing staff's technical merit.
(2) cord force of cable-stayed bridge method of testing of the invention is completed by application bridge cable automatic detection device, step letter
Folk prescription just, can realize Suo Li synchro measure while other damages such as drag-line outward appearance are detected, time-saving and efficiency, economy is strong.
Brief description of the drawings
Fig. 1 is the mathematical modeling structure chart of cord force of cable-stayed bridge method of testing in the embodiment of the present invention；
In figure：1- bridge cable automatic detection devices, 2- bridge stay cables, 3- tops anchor point, 4- bottoms anchor point.
Embodiment
The present invention is described in further detail below in conjunction with drawings and Examples.
Shown in Figure 1, the embodiment of the present invention provides a kind of cord force of cable-stayed bridge method of testing, using can be creeped along suspension cable
Bridge cable automatic detection device implement, the bridge cable automatic detection device used in the embodiment of the present invention can be used as in
The detecting system and bridge cable automatic detection device of bridge cable described in state patent CN201310115722.7.
The inventive method comprises the following steps：
S1, offer one have obliquity sensor and the bridge cable automatic detection device of mileage coder.It can specifically use
Obliquity sensor for obtaining automatic detection device obliquity information in real time is installed on existing highway bridge drag-line automatic detection device
Realized with the mode of the mileage coder for obtaining automatic detection device positional information in real time.
S2, walked on suspension cable using bridge cable automatic detection device, multigroup position is obtained by mileage coder
Information x1、x2…xn, obtained and the one-to-one multigroup angle information y ' of the positional information by obliquity sensor1、y′2…
y′n。
S3, positional information and angle information the calculating drag-line sag by measuring；
Step S3 may particularly include following steps：
S301, set up mathematical analysis model.Due to bridge stay cable, line style is similar to parabola under gravity, and by
3 points point-blank not can determine that a plane, therefore, and stress can be simplified in bridge oblique pull when carrying out mathematical modeling
Determined by rope in plane.With bridge stay cable bottom anchor point position origin, with suspension cable top anchor point and bottom anchor point
Line set up plane right-angle coordinate for x-axis, then it is obvious, origin (oblique pull is being crossed determined by bridge stay cable in plane
Rope bottom anchor point) perpendicular to the straight line of x-axis it is y-axis, take from suspension cable bottom anchor point to suspension cable top anchor point side
, then can be oblique by bridge to for x-axis positive direction, taking suspension cable bottom anchor point to be upwards y-axis positive direction perpendicular to the direction of x-axis
The linear foundation and calculating for being set as conic section, carrying out mathematical modeling of drag-line：
Y=ax2+bx
Now then the angle change function of drag-line is the derivative of the conic section：
Y '=2ax+b
S302, by solving following linear equation in two unknowns group obtain a, b：
S303, pressTry to achieve y maximum, then | ymax| it is the maximum sag of bridge stay cable.
S4, pass through drag-line sag calculate stay cable force.The Suo Li F of step S4 Bridge suspension cables are especially by following public affairs
Formula is calculated：
Wherein, α is the angle of bridge stay cable and bridge floor, and q is the deadweight in bridge stay cable unit length, and l is bridge
The effective length of suspension cable.
Because the bridge stay cable line style considered in above-mentioned modeling is similar to parabola, the suspension cable length calculated is also pressed
Handled according to parabola length, therefore when calculating the effective length l of bridge stay cable, two anchor is subtracted using the overall length of drag-line
Gu Qu length, i.e., only consider that two anchoring interval is similar to parabolical length, it is to avoid systematic error.
It is actual by gravity because the devices such as the shock absorber installed on suspension cable can cause bridge stay cable sag to change
The Parabolic guy cable length formed can be reduced further, and it deviates the parabolic type of above-mentioned calculating in founding mathematical models
Cause calculation error.To avoid correlated error, in step s 4, bridge can be judged before the effective length l of bridge stay cable is calculated
Whether beam suspension cable is provided with shock absorber, if it has not, then calculating as stated above；If any then in the effective length l of calculating drag-line
When, the length and shock absorber of two anchorage zone are subtracted with the overall length of drag-line to the guy cable length sum between bridge floor anchorage zone.
The present invention is not limited to the above-described embodiments, for those skilled in the art, is not departing from
On the premise of the principle of the invention, some improvements and modifications can also be made, these improvements and modifications are also considered as the protection of the present invention
Within the scope of.The content not being described in detail in this specification belongs to prior art known to professional and technical personnel in the field.
Claims (7)
1. a kind of cord force of cable-stayed bridge method of testing, is implemented using the bridge cable automatic detection device that can be creeped along suspension cable, its
It is characterised by, this method comprises the following steps：
S1, offer one have obliquity sensor and the bridge cable automatic detection device of mileage coder；
S2, walked on suspension cable using bridge cable automatic detection device, positional information is collected by mileage coder, passed through
Obliquity sensor collects angle information corresponding with the positional information；
S3, positional information and angle information the calculating drag-line sag by measuring；
S4, pass through drag-line sag calculate stay cable force.
2. cord force of cable-stayed bridge method of testing as claimed in claim 1, it is characterised in that：In the step S2, compiled by mileage
Code device collects multigroup positional information x1、x2…xn, collected and the one-to-one multigroup angle of the positional information by obliquity sensor
Spend information y '1、y′2…y′n。
3. cord force of cable-stayed bridge method of testing as claimed in claim 2, it is characterised in that：The step S3 specifically includes following step
Suddenly：
S31, bridge stay cable institute planar, set up reference frame and mathematical modeling, linear by bridge stay cable sets
It is set to conic section, lists the functional relation of the positional information and the angle information；
S32, the functional equation by the multigroup positional information of simultaneous and the angle information, obtain the positional information and institute
State the physical relationship formula of angle information；
The maximum sag of S33, the maximum for trying to achieve bridge stay cable bias, i.e. bridge stay cable.
4. cord force of cable-stayed bridge method of testing as claimed in claim 3, it is characterised in that：The step S3 specifically includes following step
Suddenly：
S301, bridge stay cable institute planar, with bridge stay cable bottom anchor point position origin, with suspension cable top anchor
The line of point and bottom anchor point sets up plane right-angle coordinate for x-axis, and linear by bridge stay cable is set as conic section：
Y=ax2+bx
Then the angle change function of drag-line is
Y '=2ax+b
S302, by solving following linear equation in two unknowns group obtain a, b：
S303, the maximum for trying to achieve yThat is the maximum sag of bridge stay cable.
5. cord force of cable-stayed bridge method of testing as claimed in claim 2, it is characterised in that：The step S4 Bridge suspension cables
Suo Li F are calculated especially by below equation：
Wherein, α is the angle of bridge stay cable and bridge floor, and q is the deadweight in bridge stay cable unit length, and L is bridge oblique pull
The effective length of rope.
6. cord force of cable-stayed bridge method of testing as claimed in claim 5, it is characterised in that：The effective length L of bridge stay cable is
The overall length of drag-line subtracts the length of two anchorage zone.
7. cord force of cable-stayed bridge method of testing as claimed in claim 5, it is characterised in that：In the step S4, bridge is being calculated
Before the effective length L of beam suspension cable, judge whether bridge stay cable is provided with shock absorber, if it has not, then calculating as stated above；
If any then when calculating the effective length L of drag-line, the length of two anchorage zone and shock absorber to bridge floor are subtracted with the overall length of drag-line
Guy cable length sum between anchorage zone.
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Cited By (6)
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| CN109371837A (en) * | 2018-11-02 | 2019-02-22 | 中铁大桥科学研究院有限公司 | A kind of suspension cable damper for taking into account cable tension test |
| CN110837705A (en) * | 2019-10-28 | 2020-02-25 | 江苏科技大学 | A force-finding method for suspension bridge cables |
| CN111366319A (en) * | 2020-03-24 | 2020-07-03 | 安阳工学院 | Device for determining damage of cable structure sample based on frequency method and using method |
| CN112381190A (en) * | 2020-11-03 | 2021-02-19 | 中交第二航务工程局有限公司 | Cable force testing method based on mobile phone image recognition |
| 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 |
| CN118332761A (en) * | 2024-03-06 | 2024-07-12 | 西南交通大学 | Inclined cable bridge monitoring method and system based on cable force and bridge deck acceleration |
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| CN105568864A (en) * | 2016-03-02 | 2016-05-11 | 东北林业大学 | Integrated algorithm for determining reasonable construction cable force of cable-stayed bridge |
| CN105865695A (en) * | 2016-05-05 | 2016-08-17 | 郑州大学 | Method for measuring cable-stayed bridge cable tension by means of GPS receiver |
| CN106500901A (en) * | 2016-10-19 | 2017-03-15 | 石家庄铁道大学 | Inclined cable force test method |
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| CN101788357A (en) * | 2009-12-16 | 2010-07-28 | 中铁大桥局股份有限公司 | Cable force monitoring method in stayed cable construction of polycarbonate (PC) steel strands |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109371837A (en) * | 2018-11-02 | 2019-02-22 | 中铁大桥科学研究院有限公司 | A kind of suspension cable damper for taking into account cable tension test |
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| CN110837705A (en) * | 2019-10-28 | 2020-02-25 | 江苏科技大学 | A force-finding method for suspension bridge cables |
| CN110837705B (en) * | 2019-10-28 | 2023-11-28 | 江苏科技大学 | A force-finding analysis method for suspension bridge cables |
| CN111366319A (en) * | 2020-03-24 | 2020-07-03 | 安阳工学院 | Device for determining damage of cable structure sample based on frequency method and using method |
| CN112381190A (en) * | 2020-11-03 | 2021-02-19 | 中交第二航务工程局有限公司 | Cable force testing method based on mobile phone image recognition |
| 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 |
| CN118332761A (en) * | 2024-03-06 | 2024-07-12 | 西南交通大学 | Inclined cable bridge monitoring method and system based on cable force and bridge deck acceleration |
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Application publication date: 20170804 |