CN107228726A - A kind of arch bridge drop shot stress in the bar high frequency dynamic test system and method - Google Patents
A kind of arch bridge drop shot stress in the bar high frequency dynamic test system and method Download PDFInfo
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- CN107228726A CN107228726A CN201710441355.8A CN201710441355A CN107228726A CN 107228726 A CN107228726 A CN 107228726A CN 201710441355 A CN201710441355 A CN 201710441355A CN 107228726 A CN107228726 A CN 107228726A
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- arch bridge
- suspension rod
- bracing wire
- short steeve
- stress
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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
- G01L5/0028—Force sensors associated with force applying means
- G01L5/0033—Force sensors associated with force applying means applying a pulling force
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- General Physics & Mathematics (AREA)
- Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)
Abstract
The invention discloses a kind of arch bridge drop shot stress in the bar high frequency dynamic test system and method, including the rotary angle transmitter I at the top of the arch bridge short steeve and rotary angle transmitter II installed in short steeve bottom, set simultaneously in the side of arch bridge short steeve and bracing wire displacement meter is installed, the top of bracing wire displacement meter is fixed on the top-side of arch bridge short steeve by fixing device；The bottom of bracing wire displacement meter is fixed on the bottom sides of arch bridge short steeve by fixing device；And bracing wire and the diameter parallel of short steeve of bracing wire displacement meter；Described rotary angle transmitter I, II and bracing wire displacement meter is connected with data collecting card.The dynamic acquisition of bridge boom stress can be achieved.The present invention is simple to operate, it is easy to use, can carries out high frequency dynamic acquisition to arch bridge short steeve using stay-supported displacement and rotary angle transmitter, real-time dynamic evaluation can be carried out to the fatigue damage of suspension rod, the health monitoring technique of arch bridge suspender is enriched, with extensive promotion prospect and value.
Description
Technical field
The present invention relates to arch bridge short steeve stress test field, it is mainly based upon stay-supported type displacement sensor and carries out suspension rod drawing
The test of stress, specifically discloses a kind of arch bridge drop shot stress in the bar high frequency dynamic test system and method.
Background technology
Suspension rod is the important primary structure member of arch bridge, and its service life determines the service life of whole bridge, therefore right
It is particularly important that health detection is carried out in the stress of suspension rod.Boom internal force test whether precise relation to Arch Bridge Construction control it is smooth
Implement, determine that arch bridge success is built.But due to by tester, computation schema, suspension rod anchorage style, length of boom
Etc. the influence of factor, certain error occurs in the monitoring of steeve tension, and there is also certain difference for different engineerings.Cause
This, chooses rationally effective test and analysis of the analysis method to arch bridge suspender stress significant.
The steeve tension of arch bridge and analysis of fatigue are an important parts in bridge, due to increasing for vehicle in recent years,
The Fatigue Damage Problem of suspension rod is more protruded, and short steeve is shorter due to length, and its bending rigidity suspension rod is in axial tension and moment of flexure
Fatigue fracture can occur under compound action.
The method of testing of common boom internal force has：Punching pressure sensor mensuration, stretch-draw jack mensuration, oil pressure
Jack mensuration, frequency method etc..First three methods belong to direct method, although its is simple and easy to apply, using more general in construction
Time, but it is costly, and the stretching force of bitter end head can only be measured.Steeve tension is tested using frequency method, measurement accuracy is high, and
Instrument is easy to carry, installed.But for short steeve in arch bridge, its boundary condition can not approximately be hinged processing, resist
The internal force influence of curved rigidity and boundary condition on suspension rod is very big.While it is worth noting that：When being monitored using frequency method, need
Spectrum Conversion is carried out to short steeve vibration signal, and Spectrum Conversion needs substantial amounts of data in itself, typically at least needs several seconds
The data of clock can just obtain more effective frequency values.And the vehicle speed per hour in general bridge on highway is at least up to 80km/
H, therefore, time of the car by a bridge block also with regard to several seconds.Therefore, when vehicle is passed a bridge, if being tested using frequency method,
It is only capable of obtaining a small amount of test data, it is impossible to capture the suspension rod variation of stress during vehicle is passed a bridge, and then the skill
Art, which obtains test result, can not be used for the vehicle fatigue life damage assessment of suspension rod.
The content of the invention
The present invention monitors problem to solve the fatigue stress of short steeve, it is proposed that one kind is based on stay-supported type displacement sensor
The method that steeve tension is tested with rotary angle transmitter.The test of steeve tension can be carried out using relatively inexpensive, succinct means,
And pass through the real-time Monitoring Data of wireless transmitting system, it is ensured that the safe operation of bridge；Its test general principle be：By suspension rod
Stress decomposition be axle power and moment of flexure partial stack value.
To achieve these goals, the present invention proposes following technical scheme：
A kind of arch bridge drop shot stress in the bar high frequency dynamic test system, including the rotation angular sensing at the top of arch bridge short steeve
The device I and rotary angle transmitter II installed in short steeve bottom, bracing wire displacement is provided with while being set in the side of arch bridge short steeve
Meter, the top of described bracing wire displacement meter is fixed on the top-side of arch bridge short steeve by fixing device；Described bracing wire position
The bottom for moving meter is fixed on the bottom sides of arch bridge short steeve by fixing device；And bracing wire and the short steeve of bracing wire displacement meter
Diameter parallel；Described rotary angle transmitter I, II and bracing wire displacement meter is connected with data collecting card.
Further, described rotary angle transmitter I, II are used for the corner for detecting short steeve, and then obtain what suspension rod was born
Moment of flexure.
Further, described bracing wire displacement meter is used for the length change for detecting short steeve.
The method tested using said apparatus is as follows：
Step one, the short steeve in arch bridge is chosen, device bracing wire displacement meter is consolidated respectively sideways at the top and bottom of suspension rod
Determine device, then arrange stay-supported type displacement sensor；
Step 2, on suspension rod top and bottom arrangement rotary angle transmitter I, rotary angle transmitter II；
Step 3, during vehicle is travelled on bridge, the length of suspension rod and the top and bottom corner of suspension rod can occur
This change can be converted into electric signal and exported by change, stay-supported type displacement sensor and rotary angle transmitter, utilize dynamic collecting instrument
The electric signal is acquired；
The top corners collected and bottom comers are carried out data processing by step 4；The curvature value of suspension rod is obtained, and then
Obtain the moment of flexure that suspension rod is born；
The stress that step 5, superposition axle power and moment of flexure are produced, the high frequency for finally obtaining suspension rod stress according to the above method is moved
State variation of stress.
Further, curvature value C=(A1-A2)/L of described suspension rod, wherein A1 represent that suspension rod top corners, A2 are represented
What boom foot corner A2, L were represented is the length of suspension rod.
Further, moment M=EIC that described suspension rod is born, wherein EI represent rotational stiffness, and C represents the song of suspension rod
Rate value.
Further, stress σ=N/A+My/ (I) that the superposition axle power and moment of flexure are produced, N represents axle power, passes through bracing wire
Formula displacement transducer is measured；The cross-sectional area of A suspension rods, M represents moment of flexure, and y represents the distance apart from neutral axis；I represents the moment of inertia.
Beneficial effects of the present invention are as follows：
The present invention proposes a kind of arch bridge drop shot stress in the bar high frequency dynamic test system and method, and bridge boom can be achieved
The dynamic acquisition of stress.The present invention is simple to operate, is easy to use, can be to arch bridge drop shot using stay-supported displacement and rotary angle transmitter
Bar carries out high frequency dynamic acquisition, can carry out real-time dynamic evaluation to the fatigue damage of suspension rod, enriches the health prison of arch bridge suspender
Survey technology, with extensive promotion prospect and value.
Brief description of the drawings
The Figure of description for constituting the part of the application is used for providing further understanding of the present application, and the application's shows
Meaning property embodiment and its illustrate be used for explain the application, do not constitute the improper restriction to the application.
Fig. 1 is that by axle power and moment of flexure fatigue fracture schematic diagram is occurred for arch bridge short steeve.
Fig. 2 driving conditions jackshaft beam vibrations and spectrum analysis schematic diagram.
Fig. 3 is the general principle of this appraisal procedure.
Fig. 4 is the schematic diagram of this appraisal procedure.
In figure, 1,2 be bracing wire displacement meter top, base fixture, and 3 be guy type displacement meter, and 4 be bracing wire, 5,6 be top,
The rotary angle transmitter of bottom, 7 be high-frequency data capture card, and 8 be sensor cable, 9 suspension rods.
Embodiment
It is noted that described further below is all exemplary, it is intended to provide further instruction to the application.Unless another
Indicate, all technologies used herein and scientific terminology are with usual with the application person of an ordinary skill in the technical field
The identical meanings of understanding.
It should be noted that term used herein above is merely to describe embodiment, and be not intended to restricted root
According to the illustrative embodiments of the application.As used herein, unless the context clearly indicates otherwise, otherwise singulative
It is also intended to include plural form, additionally, it should be understood that, when in this manual using term "comprising" and/or " bag
Include " when, it indicates existing characteristics, step, operation, device, component and/or combinations thereof.
As background technology is introduced, in the prior art, when vehicle is passed a bridge, if being tested using frequency method, only it is only capable of
Obtain a small amount of test data, it is impossible to capture the suspension rod variation of stress during vehicle is passed a bridge, and then the technology is obtained
The vehicle fatigue life damage that test result can not be used for suspension rod is assessed, and in order to solve technical problem as above, the application is carried
A kind of arch bridge drop shot stress in the bar high frequency dynamic test system and method are gone out.
It is dynamic there is provided a kind of arch bridge drop shot stress in the bar high frequency as shown in Figure 4 in a kind of typical embodiment of the application
State test system, including the rotary angle transmitter 5 at the top of arch bridge short steeve and the rotation angular sensing installed in short steeve bottom
Device 6, bracing wire displacement meter is provided with while being set in the side of arch bridge short steeve, and the top of described bracing wire displacement meter 3 passes through admittedly
Determine the top-side that device 1 is fixed on arch bridge short steeve；The bottom of described bracing wire displacement meter 3 is fixed on by fixing device 2
The bottom sides of arch bridge short steeve；And the bracing wire 4 of bracing wire displacement meter and the diameter parallel of short steeve；Described rotary angle transmitter I,
II and bracing wire displacement meter are connected by sensor cable 8 with data collecting card 7.
Further, described rotary angle transmitter I, II are used for the corner for detecting short steeve, and then obtain what suspension rod was born
Moment of flexure.
Further, described bracing wire displacement meter is used to detecting the length change of short steeve, and then or its axle power.
Heretofore described short steeve refers to suspension rod shorter on arch bridge, and easily by the suspension rod of fatigue damage.
A kind of above-mentioned method of testing of arch bridge drop shot stress in the bar high frequency dynamic test system is done into one below in conjunction with the accompanying drawings
Step explanation, it is specific as follows：
Step one, the short steeve in Fig. 4 arch bridges is chosen, the fixation of device bracing wire displacement meter is distinguished at the top and bottom of suspension rod
Device 1,2, then arranges stay-supported type displacement sensor 3；
Step 2, on suspension rod top and bottom arrangement rotary angle transmitter 5,6；
Step 3, during vehicle is travelled on bridge, the length of suspension rod and the top and bottom corner of suspension rod can occur
This change can be converted into electric signal and exported by change, stay-supported type displacement sensor 3 and rotary angle transmitter 5,6, be adopted using dynamic
Collection 7 pairs of electric signals of instrument are acquired；
Step 4, data processing is carried out by the top corners A1 collected and bottom comers A2.Obtain the curvature value of suspension rod
For:C=(A1-A2)/L, and then obtain moment M=EIC that suspension rod is born；
Step 5, such as Fig. 3 are superimposed the stress that axle power and moment of flexure are produced：σ=N/A+My/ (I), is finally obtained according to the above method
Obtain the high frequency dynamic stress changing rule of suspension rod stress.
Wherein A1 represents that suspension rod top corners, A2 represent that what boom foot corner, L represented is the length of suspension rod；EI is represented
Rotational stiffness, C represents the curvature value of suspension rod；N represents axle power,
Measured by stay-supported type displacement sensor；The cross-sectional area of A suspension rods, M represents moment of flexure, and y is represented apart from neutral axis
Distance；I represents the moment of inertia.
The dynamic acquisition of bridge boom stress can be achieved.The present invention is simple to operate, is easy to use, using stay-supported displacement and
Rotary angle transmitter can carry out high frequency dynamic acquisition to arch bridge short steeve, can carry out real-time dynamic evaluation to the fatigue damage of suspension rod,
The health monitoring technique of arch bridge suspender is enriched, with extensive promotion prospect and value.
Although above-mentioned the specific implementation method of the present invention is described with reference to accompanying drawing, not to present invention protection model
The limitation enclosed, one of ordinary skill in the art should be understood that on the basis of technical scheme those skilled in the art are not
Need to pay various modifications or deform still within protection scope of the present invention that creative work can make.
Claims (7)
1. a kind of arch bridge drop shot stress in the bar high frequency dynamic test system, it is characterised in that including at the top of arch bridge short steeve
Rotary angle transmitter I and the rotary angle transmitter II installed in short steeve bottom, while arch bridge short steeve side set install
There is bracing wire displacement meter, the top of described bracing wire displacement meter is fixed on the top-side of arch bridge short steeve by fixing device；Institute
The bottom for the bracing wire displacement meter stated is fixed on the bottom sides of arch bridge short steeve by fixing device；And the bracing wire of bracing wire displacement meter
With the diameter parallel of short steeve；Described rotary angle transmitter I, II and bracing wire displacement meter is connected with data collecting card.
2. a kind of arch bridge drop shot stress in the bar high frequency dynamic test system as claimed in claim 1, it is characterised in that described turns
Angle transducer I, II are used for the corner for detecting short steeve, and then obtain the moment of flexure that suspension rod is born.
3. a kind of arch bridge drop shot stress in the bar high frequency dynamic test system as claimed in claim 1, it is characterised in that described drawing
Displacement of the lines meter is used for the length change for detecting short steeve.
4. the method tested using any described devices of claim 1-3, it is characterised in that as follows：
Step one, the short steeve in arch bridge is chosen, the fixed dress of device bracing wire displacement meter is distinguished sideways at the top and bottom of suspension rod
Put, then arrange stay-supported type displacement sensor；
Step 2, on suspension rod top and bottom arrangement rotary angle transmitter I, rotary angle transmitter II；
Step 3, during vehicle is travelled on bridge, the length of suspension rod and the top and bottom corner of suspension rod can change,
This change can be converted into electric signal and exported by stay-supported type displacement sensor and rotary angle transmitter, using dynamic collecting instrument to the electricity
Signal is acquired；
The top corners collected and bottom comers are carried out data processing by step 4；The curvature value of suspension rod is obtained, and then is obtained
The moment of flexure that suspension rod is born；
The stress that step 5, superposition axle power and moment of flexure are produced, the high frequency for finally obtaining suspension rod stress according to the above method dynamically should
Power changing rule.
5. utilize the method for the test described in claim 4, it is characterised in that as follows：
Curvature value C=(A1-A2)/L of described suspension rod, wherein A1 represent that suspension rod top corners, A2 represent boom foot corner
What A2, L were represented is the length of suspension rod.
6. utilize the method for the test described in claim 4, it is characterised in that moment M=EIC that described suspension rod is born, its
Middle EI represents rotational stiffness, and C represents the curvature value of suspension rod.
7. utilize the method for the test described in claim 4, it is characterised in that the stress σ that the superposition axle power and moment of flexure are produced
=N/A+My/ (I), N represents axle power, is measured by stay-supported type displacement sensor；The cross-sectional area of A suspension rods, M represents moment of flexure, y tables
Show the distance apart from neutral axis, I represents the moment of inertia.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201710441355.8A CN107228726B (en) | 2017-06-13 | 2017-06-13 | A kind of arch bridge drop shot stress in the bar high frequency dynamic test system and method |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201710441355.8A CN107228726B (en) | 2017-06-13 | 2017-06-13 | A kind of arch bridge drop shot stress in the bar high frequency dynamic test system and method |
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| CN107228726A true CN107228726A (en) | 2017-10-03 |
| CN107228726B CN107228726B (en) | 2019-05-10 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112213092A (en) * | 2020-10-09 | 2021-01-12 | 广西交科集团有限公司 | Measuring method for testing internal force increment of arch bridge suspender by adopting inertia method |
| CN115388758A (en) * | 2022-08-19 | 2022-11-25 | 重庆科技学院 | Method for monitoring angle change of hanger rod of self-anchored track suspension bridge structure |
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| CN102230833A (en) * | 2011-04-22 | 2011-11-02 | 华北水利水电学院 | Frequency method-based suspender tension determining method |
| CN102230927A (en) * | 2011-04-22 | 2011-11-02 | 华北水利水电学院 | Suspender damage identification method for half-through and through arch bridges |
| CN103557978A (en) * | 2013-11-15 | 2014-02-05 | 广西交通科学研究院 | Method for accurately measuring cable force of short boom of boom arch bridge |
| CN105698975A (en) * | 2016-01-26 | 2016-06-22 | 华北水利水电大学 | Suspension rod tension force measurement method in variable temperature environment based on frequency method |
| CN106442541A (en) * | 2016-09-12 | 2017-02-22 | 东南大学 | Cable structure monitoring method based on long gauge optical fiber grating sensors |
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2017
- 2017-06-13 CN CN201710441355.8A patent/CN107228726B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102230833A (en) * | 2011-04-22 | 2011-11-02 | 华北水利水电学院 | Frequency method-based suspender tension determining method |
| CN102230927A (en) * | 2011-04-22 | 2011-11-02 | 华北水利水电学院 | Suspender damage identification method for half-through and through arch bridges |
| CN103557978A (en) * | 2013-11-15 | 2014-02-05 | 广西交通科学研究院 | Method for accurately measuring cable force of short boom of boom arch bridge |
| CN105698975A (en) * | 2016-01-26 | 2016-06-22 | 华北水利水电大学 | Suspension rod tension force measurement method in variable temperature environment based on frequency method |
| CN106442541A (en) * | 2016-09-12 | 2017-02-22 | 东南大学 | Cable structure monitoring method based on long gauge optical fiber grating sensors |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112213092A (en) * | 2020-10-09 | 2021-01-12 | 广西交科集团有限公司 | Measuring method for testing internal force increment of arch bridge suspender by adopting inertia method |
| CN115388758A (en) * | 2022-08-19 | 2022-11-25 | 重庆科技学院 | Method for monitoring angle change of hanger rod of self-anchored track suspension bridge structure |
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| CN107228726B (en) | 2019-05-10 |
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