CN205843918U - Slab and girder load identification and the multi-function test stand of non-destructive tests - Google Patents
Slab and girder load identification and the multi-function test stand of non-destructive tests Download PDFInfo
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- CN205843918U CN205843918U CN201620814942.8U CN201620814942U CN205843918U CN 205843918 U CN205843918 U CN 205843918U CN 201620814942 U CN201620814942 U CN 201620814942U CN 205843918 U CN205843918 U CN 205843918U
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Abstract
This utility model discloses a kind of slab and girder load identification and the multi-function test stand of non-destructive tests, including T-slot platform, support means, mobile lifting tables, support means includes support post, the bottom of support post is arranged on T-slot platform, support post has 4, two row two row arrangements, mobile lifting tables is removably mounted on T-slot platform, the end face of mobile lifting tables is provided with vibrator A.This utility model can be simultaneously used for plate, the load identification of girder construction sample and Study on Damage Identification, it is also possible to the theoretical applied research for aspects such as the identification of Structure dynamic characteristics parameter and structure optimizations provides basis.
Description
Technical field
This utility model relates to Structural Dynamics field, particularly relates to a kind of slab and girder load identification and non-destructive tests
Multi-function test stand.
Background technology
Structural loads identification and non-destructive tests broadly fall into the Equations of The Second Kind inverse problem research category in Structural Dynamics.
Load identification technology is also called Load Reconstruction or load deconvolution.It is dynamic characteristic according to known structure and
The dynamic response of actual measurement carrys out a special kind of skill of the dynamic load of reverse structure.Load identification, as a kind of round-about way, is used for
Calculate load in the presence of a harsh environment or the load that directly can not be obtained by sensor.In order to solve inverse identification problem, knot
Structure model must be known.Under most of practical matter, load identification problem is ill, because not every state
Variable or initial condition are known.The concept of the dynamics problem of one good state meets following condition: 1. solution is unique；
All there is the solution of global definition in the most all reasonable data；3. solution depends on given data (stable state criterion) continuously.Load identification is asked
Inscribing relatively complicated, non-linear component, ill-condition equation affects, and theory is limited with the degree that is consistent of practical situation etc., is allowed to
Research difficulty increases, though the most existing many scholars propose some feasible method and theoretical systems, but still is current one
The research subject of individual hot topic, lacks effective recognition methods and laboratory facilities.
Load identification problem relates to the skyscraper bearing complex external dynamic load, wind turbine, at a high speed row
The structural vibration problem of car and aircraft etc..Known structure characteristic easily records dynamic response, but excitation load is but difficult to really
Fixed, but dynamic response analytical calculation, dynamics Optimization Design and the structure for former vibrational structure and new vibrational structure is strong
The problems such as health monitoring, it is necessary for solving dynamic load.Dynamic state loading identification and non-destructive tests inverse problem relate to linear system reason
Opinion, well-posedness theory, numerical modeling emulation, dynamic testing method, Digital Signal Analysis and Processing, updating dynamic model, calculating reverse
By numerical simulation example, multiple subject such as method and factor, the most only verify that proposed dynamic state loading identification and damage are known
Feasibility and the effectiveness of other solution of inverse problems method are inadequate, it is necessary to carried out it further by the method for experiment
Checking.Firstly, it is necessary to test specimen is carried out mode experiment, the result of mode experiment is used for the checking of numerical simulation model and repaiies
Just；Secondly, test one group of structural response of test specimen under various loading, the response data of this group experiment is used for suffered by test specimen
Dynamic load and the inverting identification of damage.
Along with the development of science and technology, project planner, must in order to ensure reasonability and the reliability of structure
The external dynamic load that it is born need be considered, and it is correctly estimated.Although structural outer dynamic loading is difficult to directly
Measure acquisition, but the system response that structure produces under dynamic load incentive action (strains, displacement, speed, accelerates
Degree) generally can measure and obtain, it is to have established certain test basis for Dynamic Load Identification technology.
The damage of structure first appears as appearance and the extension of crackle, and Crack Damage causes large and complex structure to destroy
One of the main reasons.Owing to the most initial fine crack is difficult to be found, is easily ignored by people, but the deep extension of crackle is past
Toward cause major disaster sexual behavior thus generation, such as aviation disaster, the fracture of bridge are caved in, the collapsing of ocean platform, Oil/Gas Pipe
The fracture leakage etc. of line, causes huge loss to country and society.Therefore, monitor and indicate the position that infant cracking occurs
With the degree of depth, prevention major accident occurs, is an important research direction in non-destructive tests field.In recent years, structural crack damage
The research of monitoring and recognition methods causes the extensive concern of Chinese scholars, becomes engineering structure health diagnosis and security evaluation
One of advanced subject of research.
Damage Assessment Method includes the content of four aspects: (1) damages the judgement of existence；(2) construction damage positioning；
(3) demarcation of structural damage degree and evaluation；(4) residual life is estimated.Construction damage positioning more holds than the demarcation of degree of injury
Easily realize.Damage reason location can meet monitors most basic needs in real time, if it is possible to be accurately judged to the position of damage, so that it may
To measure injury severity score further by tradition damage detection technology.Although ultrasound wave, current vortex, magnetic powder, infrared identification
The detection methods such as method achieve certain achievement in crack detection, but these methods are usually applicable only to the inspection to static object
Survey.Damnification recognition method based on structural vibration is commonly referred to non-destructive tests (damage identification), belongs to structure
Whole detection category, compared with the static detection method of local, has non-destructive, easily and fast, inexpensively and be prone to online reality
The advantage such as now, becomes the indispensable important means of structural damage detection and identification, has a good application prospect.As greatly
The of paramount importance component units of type labyrinth, beam structure or component have in civil engineering structure the most widely should
With, the vibration analysis of the research plate-girder class formation containing crackle is theoretical and damnification recognition method is significant.
The physical quantity being commonly used in non-destructive tests has natural frequency, the displacement vibration shape, camber mode, strain mode, frequency response
Function etc..Wherein natural frequency can reflect the overall permanence of structure, and it is convenient to measure, can be by the shaking of any point in structure
Moving and obtain, and certainty of measurement is high, low-frequency range error is generally less than 1%.Therefore the damnification recognition method using natural frequency is
Practical, how to use what natural frequency data identification of damage state always people made earnest efforts to study a question.Due to natural frequency
Not high enough to susceptibility to damage, identification of damage position and some difficulty of the order of severity, can first take identification of damage position, so simultaneously
After the way of identification of damage degree again.
The general analysis method of damage includes: CRACKED BEAM recognition methods based on vibration, be wherein mainly used in is frequency
With Mode Shape；And the application that other intelligent algorithms are in Identification of Cracks: neural network algorithm, wavelet analysis method, heredity
Algorithm etc..Main damage method has, method for crack based on observing frequency.In application practice, change based on frequency
The recognition methods of ratio also exists deficiency: natural frequency is the most sensitive to structure earlier damage, is less than for stiffness injury
The slight damage of 60%, is sometimes difficult to obtain correct recognition result；If damage position is when the low stress zones of structure, profit
Will be unable to carry out non-destructive tests with the change of natural frequency；And that measures that frequency is not enough to provide required for non-destructive tests is enough
Information, is typically only capable to determine the existence of breakage, and cannot determine position and the degree of breakage.(2) crackle based on the observation vibration shape
Recognition methods.The vibration shape is the most sensitive to the localized variation of structure, may be used to determine the damage position that structure is possible.At vibration shape base
On plinth, it is proposed that other derivative damage criterions many, as mode confidence standard surveys (MAC), modal scale factor (MSF), coordinate
Mode confidence standard surveys (COMAC), coordinate modal scale factor (COMSF), Mode Shape curvature, Mode Shape curvature difference etc., this
A little damage criterions can characterize the damage characteristic of structure.Such method faces problems with: the identification of the vibration shape, easily by noise
Polluting, the vibration shape change that damage causes usually is covered by these test errors；Not cannot not also existing completely of actual observation Data of Mode
Whole property；Although high order mode is the most sensitive to damage, but being difficult to accurately measure in Practical Project cannot measure the most at all.
According to literature research, there is presently no and can be simultaneously used for the load identification of slab and girder sample and combining of non-destructive tests
Close test platform.
Utility model content
This utility model aims to provide a kind of slab and girder load identification and the multi-function test stand of non-destructive tests, can be simultaneously
For slab and girder sample load identification and non-destructive tests, it is also possible to for the identification of Structure dynamic characteristics parameter and structure optimization etc.
The theoretical applied research of aspect provides basis.
For reaching above-mentioned purpose, this utility model realizes by the following technical solutions:
Slab and girder load identification disclosed in this utility model and the multi-function test stand of non-destructive tests, put down including T-slot
Platform, support means, mobile lifting tables, described support means includes that support post, the bottom of described support post are arranged on T-shaped
On groove platform, support post has 4, two rows two row arrangements, described mobile lifting tables is removably mounted on T-slot platform,
The end face of mobile lifting tables is provided with vibrator A.
Further, described vibrator A is slidably matched with the end face of mobile lifting tables.
Further, the top of described support post is provided with air spring.
Further, the opposite flank of two support posts of same row is respectively provided with beam sample holding device, same row
Two support posts on two beam sample holding devices between be provided with traction steel wire, removable counterweight base and guide steel
Silk, described traction steel wire is connected with removable counterweight base, and the driving means of traction steel wire is motor, and traction steel wire level sets
Putting, the two ends of described guiding steel wire connect two beam sample holding devices, described removable counterweight base and guiding steel wire respectively
Being slidably matched, also include vibrator B, the bottom of described vibrator B is adaptive with T-slot platform.
Preferably, described beam sample holding device liftable, support post is for the side of mounting rail sample holding device
Indent.
Preferably, the size of described T-slot platform is 1500*1000*100mm, and material is 45# steel.
Further, described vibrator A, vibrator B are equipped with vibrator mounting seat.
Further, vibration isolation material is all laid in the bottom of described support post, the bottom of vibrator mounting seat.
Preferably, described vibration isolation material includes marble.
Further, this utility model also includes multiple for gathering pumping signal and the acceleration transducer of response signal
It is all connected with computer with ess-strain sheet, described acceleration transducer and ess-strain sheet；Described acceleration transducer and stress
Foil gauge is arranged on test plate or test beam.
The beneficial effects of the utility model are as follows:
One, utilize this testing stand that the structures such as plate-girder can carry out load identification, Study on Damage Identification, whole test platform structure
Simply, practical function, it is simple to install, practical.
When two, utilizing this testing stand to carry out structure sample testing, integral plate, beam and damage plate, Liang Jie can be carried out simultaneously
Structure, and have not damaged plate, the girder construction of different materials, different type of impairment carry out comparative test and analysis.
Three, whole experimental bench system cost is relatively low, strong operability, it is simple to basic research.
Four, transducer arrangements is optimized setting, obtains data maximally effective to structural loads identification and non-destructive tests.
Five, stand resonance effect is studied, provide theoretical and experiment basis for Optimal Structure Designing.
Accompanying drawing explanation
Fig. 1 is the structural representation of embodiment 1；
Fig. 2 is the structural representation of embodiment 2；
In figure: 1-T type groove platform, 2-support post, 3-air spring, 4-test plate, 5-vibrator A, 6-may move
Lifting platform, 7-traction steel wire, 8-guide steel wire, 9-tests beam, 10-vibrator B, 11-may move counterweight base, 12-beam sample
Clamping device.
Detailed description of the invention
In order to make the purpose of this utility model, technical scheme and advantage clearer, below in conjunction with accompanying drawing, to this reality
It is further elaborated with novel.
Embodiment 1
As it is shown in figure 1, the present embodiment includes T-slot platform 1, support means, mobile lifting tables 6, T-slot platform 1
A size of 1500*1000*100mm, material is 45# steel；Support means includes that support post 2, the top of support post 2 are provided with sky
Air spring 3, the bottom of support post 2 is arranged on T-slot platform 1, and support post 2 has 4, two row two row arrangements, removable
Being removably mounted at bottom lifting platform 6 on T-slot platform 1, the end face of mobile lifting tables 6 is provided with vibrator A5, vibrator A5
Being slidably matched with the end face of mobile lifting tables 6, vibrator A5 is provided with vibrator mounting seat；The bottom of support post, vibrator
Vibration isolation material is all laid in the bottom of mounting seat, and vibration isolation material includes marble.
The present embodiment also includes multiple for gathering pumping signal and the acceleration transducer of response signal and ess-strain
Sheet, acceleration transducer and ess-strain sheet are all connected with computer.
The present embodiment is applicable to the test of plate sample coupon, during use, is placed on air spring 3 by test plate 4, multiple
Acceleration transducer and ess-strain sheet are distributed on test plate 4, in order to carry out structural loads identification and non-destructive tests, need
First modal test, the natural frequency value of test structure, damping ratio, Mode Shape etc., analysis spectrum data and response are carried out
Time history, provides basis for platform system resonance effect research and structure optimization.Secondly, need slab and girder is vibrated
Response test, gathers response time course signal, can be hammered into shape by power or vibrator provides dynamic load signal, and signal generator is sent out
Go out simple signal, produce exciting force through power amplifier.Finally choose different response measuring points and carry out load identification and damage
Identify, the load value of identification and the measured value of force transducer are compared.The natural frequency value of verification stand and driving frequency
Value range, it is to avoid resonant frequency.
For the process of test data, data acquisition instrument the collection number passed back at acceleration transducer and foil gauge
According to, Computer Storage data.And voltage signal is converted to corresponding acceleration signal, rate signal, displacement signal, stress is believed
Number or strain signal etc..Experimental data is carried out abnormal value elimination simultaneously, eliminates trend term, filter, statistical analysis, sensitive
Degree is analyzed and is processed.For acceleration transducer and the deployment scenarios of ess-strain sheet of slab and girder subjects, due to plate
Girder construction is all the structure of comparison rule, therefore can arrange the most intensive acceleration in the case of sensor model number allows
Sensor and ess-strain sheet.And as far as possible in the position of loaded load and the location arrangements sensing as much as possible with damage
Device and foil gauge.
In test process, mobile lifting tables 6 arbitrarily can move on T-slot platform 1, realizes vibrator A on it whereby
Mobile.
Embodiment 2
As in figure 2 it is shown, the difference of the present embodiment and embodiment 1 is:
Remove the mobile lifting tables 6 in embodiment 1 and vibrator A5, increase with lower part:
The opposite flank of the indent of two support posts 2 of same row is respectively provided with liftable beam sample holding device
12, traction steel wire 7, removable counterweight are set between two beam sample holding devices 12 on two support posts 2 of same row
Base 11 and guiding steel wire 8, traction steel wire 7 is connected with removable counterweight base 11, and traction steel wire 7 uses motor to drive, traction
Steel wire 7 is horizontally disposed with, and the two ends guiding steel wire 8 connect above-mentioned two beam sample holding device 12 respectively, removable counterweight base
11 are slidably matched with guiding steel wire 8, and vibrator B10 is arranged on T-slot platform 1, and as required, vibrator B10 can have many
Individual, vibrator B10 is provided with vibrator mounting seat, and vibration isolation material is all laid in the bottom of vibrator mounting seat, and vibration isolation material includes greatly
Gypsum Fibrosum.
The present embodiment is applicable to the test of beam sample coupon, during use, the two ends of test beam 9 is connected to two beam examinations
Sample clamping device 12, multiple acceleration transducers and ess-strain sheet are arranged on test beam 9, and four support posts 2 support
Two test beams 9, can be used for complete beam and damage beam and the contrast test of the beam non-destructive tests of different materials.
Control motor speed and realize the applying of the mobile load under friction speed, by removable counterweight base 11
The counterweight adding different quality carrys out controlled loading magnitude of load.Two position adjustable vibrator B10 can be laid under girder construction, with
This applies sine sweep signal, linear frequency sweep, sinusoidal fixed frequency wait load signal, or can be directly structure by modal forces hammer
Pulse shock load is provided；Carry out the collection of structural response data.
The process of response data is similar with embodiment 1, therefore repeats no more.
Certainly, this utility model also can have other various embodiments, spiritual and essence without departing substantially from this utility model
In the case of, those of ordinary skill in the art can make various corresponding change and deformation according to this utility model, but these phases
Change and the deformation answered all should belong to the scope of the claims appended by this utility model.
Claims (10)
1. the identification of slab and girder load and the multi-function test stand of non-destructive tests, it is characterised in that: include T-slot platform, support
Device, mobile lifting tables, described support means includes that support post, the bottom of described support post are arranged on T-slot platform
On, support post has 4, and two row two row arrangements, described mobile lifting tables is removably mounted on T-slot platform, may move
The end face of lifting platform is provided with vibrator A.
Slab and girder load identification the most according to claim 1 and the multi-function test stand of non-destructive tests, it is characterised in that:
Described vibrator A is slidably matched with the end face of mobile lifting tables.
Slab and girder load identification the most according to claim 1 and the multi-function test stand of non-destructive tests, it is characterised in that:
The top of described support post is provided with air spring.
4. according to the slab and girder load identification described in claim 1,2 or 3 and the multi-function test stand of non-destructive tests, its feature
Being: the opposite flank of two support posts of same row is respectively provided with beam sample holding device, two supports of same row are vertical
It is provided with traction steel wire, removable counterweight base between two beam sample holding devices on post and guides steel wire, described traction
Steel wire is connected with removable counterweight base, and the driving means of traction steel wire is motor, and traction steel wire is horizontally disposed with, described guiding steel
The two ends of silk connect two beam sample holding devices respectively, and described removable counterweight base is slidably matched with guiding steel wire, also wraps
Including vibrator B, the bottom of described vibrator B is adaptive with T-slot platform.
Slab and girder load identification the most according to claim 4 and the multi-function test stand of non-destructive tests, it is characterised in that:
Described beam sample holding device liftable, support post is for the side indent of mounting rail sample holding device.
Slab and girder load identification the most according to claim 1 and the multi-function test stand of non-destructive tests, it is characterised in that:
The size of described T-slot platform is 1500*1000*100mm, and material is 45# steel.
Slab and girder load identification the most according to claim 4 and the multi-function test stand of non-destructive tests, it is characterised in that:
Described vibrator A, vibrator B are equipped with vibrator mounting seat.
Slab and girder load identification the most according to claim 7 and the multi-function test stand of non-destructive tests, it is characterised in that:
Vibration isolation material is all laid in the bottom of described support post, the bottom of vibrator mounting seat.
Slab and girder load identification the most according to claim 8 and the multi-function test stand of non-destructive tests, it is characterised in that:
Described vibration isolation material includes marble.
Slab and girder load identification the most according to claim 4 and the multi-function test stand of non-destructive tests, its feature exists
In: also include multiple for gathering pumping signal and the acceleration transducer of response signal and ess-strain sheet, described acceleration
Sensor and ess-strain sheet are all connected with computer；Described acceleration transducer and ess-strain sheet be arranged in test plate or
On test beam.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620814942.8U CN205843918U (en) | 2016-07-28 | 2016-07-28 | Slab and girder load identification and the multi-function test stand of non-destructive tests |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201620814942.8U CN205843918U (en) | 2016-07-28 | 2016-07-28 | Slab and girder load identification and the multi-function test stand of non-destructive tests |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106092479A (en) * | 2016-07-28 | 2016-11-09 | 西南交通大学 | Slab and girder load identification and the multi-function test stand of non-destructive tests |
| CN107179172A (en) * | 2017-06-08 | 2017-09-19 | 福州市公路局 | Bridge pier based on jump bit washes away condition monitoring system and method |
| CN107705292A (en) * | 2017-09-12 | 2018-02-16 | 武汉大学 | A kind of saddle camber building damnification recognition method based on digitlization modal coordinate |
| CN108414367A (en) * | 2018-03-13 | 2018-08-17 | 北京科技大学 | A kind of simply supported beam bending stiffness measuring system and method based on resonance |
| CN111982442A (en) * | 2020-09-04 | 2020-11-24 | 北京无线电测量研究所 | Resonance actuator |
| CN114088322A (en) * | 2021-11-18 | 2022-02-25 | 天元建设集团有限公司 | Experimental platform for simulating seismic force response numerical value of bridge connecting assembly |
| CN115791972A (en) * | 2023-01-18 | 2023-03-14 | 河北铁达科技有限公司 | Steel structure column health state evaluation method, evaluation terminal and storage medium |
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2016
- 2016-07-28 CN CN201620814942.8U patent/CN205843918U/en not_active Expired - Fee Related
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106092479A (en) * | 2016-07-28 | 2016-11-09 | 西南交通大学 | Slab and girder load identification and the multi-function test stand of non-destructive tests |
| CN106092479B (en) * | 2016-07-28 | 2018-08-14 | 西南交通大学 | Slab and girder load identifies and the multi-function test stand of non-destructive tests |
| CN107179172A (en) * | 2017-06-08 | 2017-09-19 | 福州市公路局 | Bridge pier based on jump bit washes away condition monitoring system and method |
| CN107705292A (en) * | 2017-09-12 | 2018-02-16 | 武汉大学 | A kind of saddle camber building damnification recognition method based on digitlization modal coordinate |
| CN108414367A (en) * | 2018-03-13 | 2018-08-17 | 北京科技大学 | A kind of simply supported beam bending stiffness measuring system and method based on resonance |
| CN108414367B (en) * | 2018-03-13 | 2024-05-28 | 北京科技大学 | System and method for measuring bending stiffness of simply supported beam based on resonance |
| CN111982442A (en) * | 2020-09-04 | 2020-11-24 | 北京无线电测量研究所 | Resonance actuator |
| CN114088322A (en) * | 2021-11-18 | 2022-02-25 | 天元建设集团有限公司 | Experimental platform for simulating seismic force response numerical value of bridge connecting assembly |
| CN114088322B (en) * | 2021-11-18 | 2023-04-28 | 天元建设集团有限公司 | Experimental platform for seismic force response numerical simulation of bridge connecting assembly |
| CN115791972A (en) * | 2023-01-18 | 2023-03-14 | 河北铁达科技有限公司 | Steel structure column health state evaluation method, evaluation terminal and storage medium |
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