CN110018044A - A kind of paving steel bridge deck modulus test device based on digital picture - Google Patents

A kind of paving steel bridge deck modulus test device based on digital picture Download PDF

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Publication number
CN110018044A
CN110018044A CN201910307433.4A CN201910307433A CN110018044A CN 110018044 A CN110018044 A CN 110018044A CN 201910307433 A CN201910307433 A CN 201910307433A CN 110018044 A CN110018044 A CN 110018044A
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CN
China
Prior art keywords
test specimen
test
bridge deck
composite
loading
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Pending
Application number
CN201910307433.4A
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Chinese (zh)
Inventor
姚波
周鲁晓冬
严金海
李木子
郭鹏成
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Nanjing University of Science and Technology
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Nanjing University of Science and Technology
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Priority to CN201910307433.4A priority Critical patent/CN110018044A/en
Publication of CN110018044A publication Critical patent/CN110018044A/en
Pending legal-status Critical Current

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    • GPHYSICS
    • G01MEASURING; TESTING
    • G01NINVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N3/00Investigating strength properties of solid materials by application of mechanical stress
    • G01N3/02Details
    • G01N3/06Special adaptations of indicating or recording means
    • G01N3/068Special adaptations of indicating or recording means with optical indicating or recording means
    • GPHYSICS
    • G01MEASURING; TESTING
    • G01NINVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N2203/00Investigating strength properties of solid materials by application of mechanical stress
    • G01N2203/0058Kind of property studied
    • G01N2203/0069Fatigue, creep, strain-stress relations or elastic constants
    • G01N2203/0073Fatigue
    • GPHYSICS
    • G01MEASURING; TESTING
    • G01NINVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N2203/00Investigating strength properties of solid materials by application of mechanical stress
    • G01N2203/02Details not specific for a particular testing method
    • G01N2203/06Indicating or recording means; Sensing means
    • G01N2203/0641Indicating or recording means; Sensing means using optical, X-ray, ultra-violet, infrared or similar detectors
    • G01N2203/0647Image analysis

Abstract

The invention discloses a kind of paving steel bridge deck modulus test device based on digital picture, including model unit, control unit, loading unit, test specimen fixed cell and digital image acquisition units, model unit includes composite beam test specimen, composite beam test specimen is compounded to form by T-steel beam with the bitumen layer for being located at T-steel beam upper layer, control unit includes computer, Main Control Tank, loading unit includes loading device, test specimen pressure head, test specimen fixed cell includes the workbench below test specimen pressure head, operating platform, the spherical bearing being set on workbench, first power transmission gasket and the second power transmission gasket, digital image acquisition units include the CCD camera being supported on operating platform by bracket, first and second lighting sources, composite beam test specimen can be carried on workbench by the spherical bearing.The present invention can be compatible with a variety of experimental conditions, and test data is accurate, easy to use, the stress under the more preferable simulation real work of energy.

Description

A kind of paving steel bridge deck modulus test device based on digital picture
Technical field
The invention belongs to paving steel bridge deck detection technique field, a kind of specifically steel deck paving based on digital picture Die-filling amount test device.
Background technique
The composite construction that paving steel bridge deck is made of single-layer or multi-layer asphalt and steel bridge deck, each structure sheaf by Binding material is combined into entirety, and pave-load layer is closely coupled with steel bridge deck always in normal operation, common carrying and change Shape, the two are influenced each other, are mutually restricted.Pave-load layer modulus refers to pave-load layer the ratio between stress and strain under stress, is steel The important indicator of deck paving Scheme Choice.Influence of the pave-load layer modulus to pave-load layer stress is fairly obvious.The modulus of pave-load layer Bigger, the shear stress between pave-load layer and steel plate is bigger, and the growth rate of transverse shearing stress is greater than longitudinal shearing stress.Therefore, increase The modulus of big pave-load layer, can increase the rigidity of bridge deck, reduce the horizontal tensile stress of pave-load layer top surface, reduce Crack failure Possibility;But consequent is that interlaminar shear stress greatly increases, if adhesion strength is not able to satisfy the requirement of shear stress, meeting So that the bonding situation between pave-load layer and steel plate is no longer complete continuous state, significant changes will occur for the stress of pave-load layer.Cause This, the measurement of pave-load layer modulus has a very important significance.
The composite beam test model and test device that test uses both at home and abroad at present cannot fully meet test Steel Bridge Deck The needs of pave-load layer modulus.Such as one kind that Stuttgart University, Germany Otto-Ge Lafu research institute test model provides is used for The model of highway steel bridge beam asphalt concrete pavement layer modulus detection and deck paving seminar, Southeast China University use similar German simplified model and the composite beam test model suitable for being tested among MTS.But these models and method all exist Some problems: on the one hand, they often all use the loading method of imposed load on the steel plate, can not accurately simulate reality Working condition;On the other hand, complicated operation in terms of the Moduli data of measuring and calculating composite beam for existing test method and device, Also the needs for accurately calculating each layer Moduli data of composite beam are unable to satisfy.
Summary of the invention
The purpose of the present invention is to provide a kind of a variety of experimental conditions of compatibility, test data is accurate, easy to use is based on The paving steel bridge deck modulus test device of digital picture.
To achieve the goals above, The technical solution adopted by the invention is as follows:
A kind of paving steel bridge deck modulus test device based on digital picture, including model unit, control unit, load list Member, test specimen fixed cell and digital image acquisition units, the model unit include composite beam test specimen, the composite beam test specimen by T-steel beam is compounded to form with the bitumen layer for being located at T-steel beam upper layer, and described control unit includes computer, Main Control Tank, institute Stating loading unit includes loading device, test specimen pressure head, and the test specimen fixed cell includes that the work below test specimen pressure head is flat Platform, operating platform, the spherical bearing being set on workbench, the first power transmission gasket and the second power transmission gasket, the digitized map As acquisition unit include the CCD camera being supported in by bracket on operating platform, the first lighting source, the second lighting source and The image pick-up card being installed in computer, the composite beam test specimen can be carried on workbench by the spherical bearing.
Further, first lighting source and the second lighting source are set to the two sides of CCD camera.
Further, the Main Control Tank is connect with computer and loading device respectively by data line, the CCD camera It is connect by data line with computer and image pick-up card.
Compared with prior art, the present invention its remarkable advantage is:
(1) for composite beam load test, pave-load layer of the load action in composite beam test specimen, rather than the steel plate of composite beam On, in closer actual working state the case where Steel Bridge Deck Pavement, the reliability of test result is improved, model is improved Test effect;
(2) spherical bearing of the invention can be rotated up in each side, be conveniently adjusted, and can effectively solve Specimen Shape, ruler The very little influence of the factors to fatigue test such as irregular, can be effectively reduced the uncontrollable factor interference in test, improve test Reliability improves the deficiency of existing experimental rig, while spherical bearing can effectively solve the knot generated during specimen molding The problem of structure uneven surface is brought;
(3) DIC digital image correlation technique is used, thin material of seeing can be observed and deform and strain, so that data acquisition side The processing and analyst coverage of test result have significantly been expanded in formula diversification, help to carry out the research to Steel Bridge Deck Pavement;
(4) based on digital image correlation technique and with finite element tool, a kind of new Steel Bridge Deck Pavement mould is proposed Experiment calculation method is measured, establishes database to record and analyze existing test data, and arrived based on this by experimental observation Test piece deformation situation carrys out each layer modulus of inverse;
(5) connector of the invention, test specimen pressure head are absolute construction, convenient for being directed to the shape and ruler of different clamping test pieces It is very little that connector, test specimen pressure head are replaced, keep application range of the present invention more extensive, and when connector, test specimen pressure head occur It is conveniently replaceable when abrasion.
Detailed description of the invention
Fig. 1 is that the present invention is based on the structural schematic diagrams of the paving steel bridge deck modulus test device of digital picture.
Fig. 2 is the partial schematic diagram of model unit, loading unit, test specimen fixed cell.
Fig. 3 is the main view of spherical bearing.
Fig. 4 is the left view of spherical bearing.
Fig. 5 is the top view of spherical bearing.
Fig. 6 is test specimen FEM model schematic diagram.
In figure, 1- composite beam test specimen, 2- the first power transmission gasket, 3- the second power transmission gasket, 4- loading device, 5- ball Shape support, 6- bracket, 7- Main Control Tank, 8- test specimen pressure head, 9- workbench, 10- operating platform, 11-CCD video camera, The first lighting source of 12-, the second lighting source of 13-, 14- image pick-up card, 15- computer.
Specific embodiment
With reference to the accompanying drawings of the specification, the present invention is further illustrated.
In conjunction with Fig. 1-5, a kind of paving steel bridge deck modulus test device based on digital picture, including model unit, control Unit, loading unit, test specimen fixed cell and digital image acquisition units, the model unit includes composite beam test specimen 1, described Composite beam test specimen 1 is compounded to form by T-steel beam with the bitumen layer for being located at T-steel beam upper layer, and described control unit includes meter Calculation machine 15, Main Control Tank 7, the loading unit include loading device 4, test specimen pressure head 8, and the test specimen fixed cell includes being located at examination Workbench 9, the operating platform 10, the spherical bearing 5 being set on workbench 9, the first power transmission gasket 2 of 8 lower section of part pressure head With the second power transmission gasket 3, the digital image acquisition units include the CCD camera shooting being supported on operating platform 10 by bracket 6 Machine 11, the first lighting source 12, the second lighting source 13 and the image pick-up card 14 being installed in computer 15;
Composite beam test specimen 1 is carried on workbench 9 by spherical bearing 5;
The vertical actuator lower end of loading device 4 connects test specimen pressure head 8;
CCD camera 11 is placed on operating platform 10 by the control height of bracket 6, horizontal with composite beam test specimen 1 and be directed at and answer The middle position upper surface of beam test specimen 1 is closed, lighting source 12,13 is placed on 11 two sides of CCD camera, and image pick-up card 14 is installed In the computer 15;
Main Control Tank 7 is connect respectively with computer 15, loading device 4 to complete the operation of fatigue test by two data lines The collecting work of control and test data.CCD camera 11 is connect by data line with computer 15, image pick-up card 14 with complete At the collecting work of digital picture.
In the following, illustrating the specific implementation process for carrying out paving steel bridge deck modulus test using the present invention:
1. test prepares
Steel and asphalt composite beam test specimen 1 are got out, the length and width dimensions of test specimen are 800mm × 100mm, sheet steel sections Thickness can be 8-20mm, and pave-load layer segment thickness can be 40-100mm, depending on real work surface conditions;Digitized map is debugged As device and computer.
2. the process of test
Computer 15, Main Control Tank 7, the data line between fatigue tester 4, start-up loading device 4 and Main Control Tank 7 are connected, Load parameter is set by computer 15, so that vertical actuator is passed through test specimen pressure head 8 along the vertical direction and presses power transmission repeatedly downwards Gasket 2 and 3 transfers the load to composite beam test specimen 1, collects composite beam test specimen by CCD camera 11 and image pick-up card 14 Deformation.The vertical range most preferably 0-100kN that loading device 4 applies, the frequency that loading device 4 is further applied load Range most preferably 0.01-50Hz.
(1) after testing preparation, in the middle section of composite beam test specimen 1 (i.e. CCD camera 11 shoots position) Speckle coating is coated, composite beam test specimen 1 is placed on spherical bearing 5, and adjusts position and keeps alignment, by power transmission gasket 2 and 3 point It is not fixed on the both ends span centre center position of composite beam test specimen 1.Test specimen pressure head 8 is connected to the vertical actuator of loading device 4 Lower end.CCD camera 11 and lighting source 12,13 are placed according to designated position, image pick-up card 14 is installed in computer 15, The data line between computer 15, CCD camera 11 is connected, and carries out debugging efforts.
(2) computer 15, Main Control Tank 7, the data line between fatigue tester 4, start-up loading device 4 and Main Control Tank are connected 7, load parameter is set by computer 15, so that vertical actuator is passed through test specimen pressure head 8 along the vertical direction and presses biography repeatedly downwards Power gasket 2 and 3 transfers the load to the pave-load layer part of composite beam test specimen 1.The vertical range that loading device 4 applies Most preferably 0-100kN, the frequency range that loading device 4 is further applied load most preferably 0.01-50Hz.
At the same time, composite beam examination is collected by the digital image system that CCD camera 11 and image pick-up card 14 form The image information of part deformation condition.
(3) paving steel bridge deck identical with sample dimensions is constructed using ABAQUS finite element software on computer 15 to calculate Model, and grid division, as shown in Figure 6.
One is set separately to test specimen computation model and girder steel part and pave-load layer part and estimates Moduli data, and to the meter It calculates model and applies load identical with loading device 4, with finite element simulation calculation, obtain the deformation of the model, then will The test piece deformation image being collected into the deformation of each grid marked off in model and (2) compares.
Repeat above step using computer 15, and according to the modulus number of the comparing result adjustment setting obtained every time According to comparing result can be constantly close to fitting.Until obtain a difference within an acceptable range as a result, the group set mould Amount data are the paving steel bridge deck modulus that experimental test obtains.
Basic principles and main features and advantage of the invention have been shown and described above.The technical staff of the industry should Understand, the present invention is not limited to the above embodiments, and the above embodiments and description only describe originals of the invention Reason, without departing from the spirit and scope of the present invention, various changes and improvements may be made to the invention, these changes and improvements It all fall within the protetion scope of the claimed invention.The claimed scope of the invention is by appended claims and its equivalent circle It is fixed.

Claims (7)

1. a kind of paving steel bridge deck modulus test device based on digital picture, which is characterized in that single including model unit, control Member, loading unit, test specimen fixed cell and digital image acquisition units, the model unit includes composite beam test specimen (1), described Composite beam test specimen (1) is compounded to form by T-steel beam with the bitumen layer for being located at T-steel beam upper layer, and described control unit includes Computer (15), Main Control Tank (7), the loading unit include loading device (4), test specimen pressure head (8), the test specimen fixed cell Including being located at workbench (9), operating platform (10), the spherical branch being set on workbench (9) below test specimen pressure head (8) Seat (5), the first power transmission gasket (2) and the second power transmission gasket (3), the digital image acquisition units include being propped up by bracket (6) Support on operating platform (10) CCD camera (11), the first lighting source (12), the second lighting source (13) and be installed on meter Image pick-up card (14) in calculation machine (15), it is flat that the composite beam test specimen (1) can be carried on work by the spherical bearing (5) On platform (9).
2. the paving steel bridge deck modulus test device according to claim 1 based on digital picture, which is characterized in that described First lighting source (12) and the second lighting source (13) are set to the two sides of CCD camera (11).
3. the paving steel bridge deck modulus test device according to claim 1 based on digital picture, which is characterized in that described Main Control Tank (7) is connect with computer (15) and loading device (4) respectively by data line, and the CCD camera (11) passes through number It is connect according to line with computer (15) and image pick-up card (14).
4. the paving steel bridge deck modulus test device according to claim 1 based on digital picture, which is characterized in that described The length and width dimensions of composite beam test specimen (1) are 800mm × 100mm.
5. the paving steel bridge deck modulus test device according to claim 4 based on digital picture, which is characterized in that described T-steel beam with a thickness of 8-20mm, the asphalt thickness is 40-100mm.
6. the paving steel bridge deck modulus test device according to claim 1 based on digital picture, which is characterized in that described Loading device (4) vertical range is 0-100kN.
7. the paving steel bridge deck modulus test device according to claim 6 based on digital picture, which is characterized in that described The frequency range that loading device (4) is further applied load is 0.01-50Hz.
CN201910307433.4A 2019-04-17 2019-04-17 A kind of paving steel bridge deck modulus test device based on digital picture Pending CN110018044A (en)

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2006170680A (en) * 2004-12-14 2006-06-29 Shigeyuki Matsui Wheel tracking test method for pavement by means of random travel wheel load and wheel tracking tester for pavement by means of random travel wheel load
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CN103439190A (en) * 2013-08-30 2013-12-11 东南大学 Testing device for evaluating crack resistance of steel bridge deck pavement
CN205506548U (en) * 2016-02-26 2016-08-24 江苏省沙钢钢铁研究院有限公司 Brittle material compression test anchor clamps
WO2017132414A1 (en) * 2016-01-28 2017-08-03 Coe William B Rolling cyclic fatigue test platform for determining asphalt ductility
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Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2006170680A (en) * 2004-12-14 2006-06-29 Shigeyuki Matsui Wheel tracking test method for pavement by means of random travel wheel load and wheel tracking tester for pavement by means of random travel wheel load
CN103278387A (en) * 2013-06-03 2013-09-04 哈尔滨工业大学 Method for measuring parameters of flexible composite material combining finite element software simulation and experiment
CN103439190A (en) * 2013-08-30 2013-12-11 东南大学 Testing device for evaluating crack resistance of steel bridge deck pavement
WO2017132414A1 (en) * 2016-01-28 2017-08-03 Coe William B Rolling cyclic fatigue test platform for determining asphalt ductility
CN205506548U (en) * 2016-02-26 2016-08-24 江苏省沙钢钢铁研究院有限公司 Brittle material compression test anchor clamps
CN108519276A (en) * 2018-03-30 2018-09-11 河南工业大学 Bridge deck pavement is bubbled the measurement method of interfacial fracture toughness

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