CN106149545A - Intelligent self-monitoring and self-repairing memory alloy composite beam - Google Patents
Intelligent self-monitoring and self-repairing memory alloy composite beam Download PDFInfo
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- CN106149545A CN106149545A CN201610642382.7A CN201610642382A CN106149545A CN 106149545 A CN106149545 A CN 106149545A CN 201610642382 A CN201610642382 A CN 201610642382A CN 106149545 A CN106149545 A CN 106149545A
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- Prior art keywords
- alloy
- memorial alloy
- memory alloy
- concrete slab
- monitoring
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- 238000012544 monitoring process Methods 0.000 title claims abstract description 16
- 229910001285 shape-memory alloy Inorganic materials 0.000 title abstract description 12
- 239000002131 composite material Substances 0.000 title abstract description 9
- 239000000956 alloy Substances 0.000 claims abstract description 76
- 229910045601 alloy Inorganic materials 0.000 claims abstract description 74
- 230000005284 excitation Effects 0.000 claims abstract description 15
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 10
- 239000010959 steel Substances 0.000 claims abstract description 10
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 9
- 229910052799 carbon Inorganic materials 0.000 claims abstract description 9
- 238000003466 welding Methods 0.000 claims description 8
- 238000010438 heat treatment Methods 0.000 claims description 6
- 230000003446 memory effect Effects 0.000 claims description 6
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 claims 1
- 239000010931 gold Substances 0.000 claims 1
- 229910052737 gold Inorganic materials 0.000 claims 1
- 229910000521 B alloy Inorganic materials 0.000 description 13
- 230000008859 change Effects 0.000 description 9
- 229910000734 martensite Inorganic materials 0.000 description 8
- 239000000463 material Substances 0.000 description 6
- 229920000049 Carbon (fiber) Polymers 0.000 description 5
- 229910001566 austenite Inorganic materials 0.000 description 5
- 239000004917 carbon fiber Substances 0.000 description 5
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 4
- 230000009429 distress Effects 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 238000011084 recovery Methods 0.000 description 3
- 230000035882 stress Effects 0.000 description 3
- 230000009466 transformation Effects 0.000 description 3
- 230000015271 coagulation Effects 0.000 description 2
- 238000005345 coagulation Methods 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 230000005611 electricity Effects 0.000 description 2
- 239000002689 soil Substances 0.000 description 2
- 229910000967 As alloy Inorganic materials 0.000 description 1
- 240000002853 Nelumbo nucifera Species 0.000 description 1
- 235000006508 Nelumbo nucifera Nutrition 0.000 description 1
- 235000006510 Nelumbo pentapetala Nutrition 0.000 description 1
- 239000012190 activator Substances 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000006870 function Effects 0.000 description 1
- 230000035876 healing Effects 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 230000036244 malformation Effects 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000005012 migration Effects 0.000 description 1
- 238000013508 migration Methods 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 238000010008 shearing Methods 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
Classifications
-
- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D19/00—Structural or constructional details of bridges
Landscapes
- Engineering & Computer Science (AREA)
- Architecture (AREA)
- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Testing Of Devices, Machine Parts, Or Other Structures Thereof (AREA)
Abstract
The invention discloses an intelligent self-monitoring and self-repairing memory alloy composite beam which comprises an upper concrete slab, a lower I-shaped steel, a memory alloy shear nail serving as a sensing element and a carbon fiber-memory alloy composite embedded in the upper concrete slab along the length direction of the beam, wherein the memory alloy shear nail is used for connecting the upper concrete slab and the lower I-shaped steel. The device also comprises an alloy resistance measuring circuit for measuring the fatigue crack condition in the upper concrete slab during the use of the structure and an alloy excitation driving circuit for resetting and deforming the carbon fiber-memory alloy composite after the memory alloy is electrified and heated from the outside. The invention adopts the shear nails made of memory alloy materials as the connecting pieces for connecting the upper part and the lower part of the combined beam, and mainly utilizes the super-elasticity characteristic of the memory alloy; meanwhile, the alloy wire can be used as a sensing element to realize effective self-monitoring according to the basic characteristics (mainly the characteristic that the resistance of the alloy wire changes along with strain) of the alloy wire.
Description
Technical field
The present invention relates to a kind of intelligence monitoring selfreparing memorial alloy combination beam certainly, belong to bridge beam slab field.
Background technology
Bridge beam slab component is the main supporting member of bridge superstructure, directly bears the vehicle lotus that top vehicle transmission comes
Carrying, it using circumstance complication, long term service, if there is serious damage and deformation, can largely effect on the steady of bridge structure itself
Qualitative and safety, brings bigger disaster accident sometimes--and bridge floor entirety collapses.
Steel-concrete composite beam commonly used top concrete in engineering, bottom I-steel, use shearing resistance between the two even
Fitting is connected in one.That this kind of mode is primarily present problematically, conventional composite beam often occurs two kinds of fatigue ruptures: coagulation
The fatigue crack of soil beam slab itself destroys the fatigue fracture of the shear connector between concrete and steel.
The fatigue crack damage or other that should not be continuing with in use it is likely to occur for actual science of bridge building
Type rift defect problem, the present invention proposes a kind of novel combination beam that can certainly supervise selfreparing internal fissure defect.
Summary of the invention
In order to overcome the drawbacks described above that in existing engineering, steel-concrete composite beam exists, the present invention provides a kind of intelligence certainly
Monitoring selfreparing memorial alloy combination beam.
The technical solution used in the present invention is:
Intelligence is from monitoring selfreparing memorial alloy combination beam, including top concrete slab and bottom i shaped steel, its feature
It is: also include the memorial alloy WELDING STUDS as sensing element and be embedded in the carbon in the concrete slab of top along beam length direction
Fiber-memorial alloy complex, described memorial alloy WELDING STUDS is for connecting described top concrete slab and bottom I-shaped
Shaped steel.
Further, described carbon fiber-memorial alloy complex is for driving element, for enclosed member under current excitation
Crack.
Further, described memorial alloy uses one-way memory effect alloy, and described one-way memory effect alloy is relatively
Deform under low temperature, after heating, can have the shape before efficient recovery deformation.Heating condition is mainly by being energized to memorial alloy
Method；It is embodied as alloy and uses Ti-49.8Ni-50.2 and Ti-50.8Ni-49.2.
Further, also including that resistance alloys measures circuit and alloy excitation drive circuit, described resistance alloys measures electricity
Road occurs the situation of fatigue crack during structure uses for measuring inside the concrete slab of top；Described alloy excitation is driven
Carbon fiber after memorial alloy electrified regulation-memorial alloy complex reset is deformed by galvanic electricity road for outside.
Combination beam of the present invention is designed with in the concrete slab of top imbedding based on carbon fiber composite along beam length direction
The memorial alloy complex that material prepares, complex employing carbon fiber is as matrix, mainly by the tensile strength of its high intensity,
Use memorial alloy as the activator of selfreparing, exist mainly by memorial alloy (electrified regulation) under temperature variations
Huge shrinkage stress can be produced during conversion between martensite and austenite, can effectively promote crack closure.
The present invention use WELDING STUDS that memorial alloy makes as connecting the connector at the upper and lower position of combination beam, mainly profit
The super elastic characteristics having with memorial alloy itself, its big strain having, nonlinear dampling and high elastic modulus effect are permissible
It is used to make accumulator, vibrating controller.Simultaneously according to the fundamental characteristics of B alloy wire, (mainly B alloy wire resistance becomes with strain
Change characteristic), effective self-monitoring can be realized as sensing element.
Containing two-way circuit in the combination beam of the present invention, a road is SMA memorial alloy drive circuit, for outside to memory
B alloy wire electrified regulation, promotes memorial alloy complex to carry out the deformation that resets, effectively closed fatigue crack；Another road is SMA note
Recall resistance alloys and measure circuit, for measuring top beams of concrete intralaminar part during structure uses, the shape of fatigue crack occurs
Condition.
Relation between resistance variations and the concrete deformation of memorial alloy when the present invention obtains malformation by test, from
And obtaining the curve linear relationship between fracture width and resistance change rate, SMA resistance is detected and can realize concrete by utilization
The lossless real-time monitoring of beam damage, it is judged that whether inside concrete crack is in secure section；Imbed in advance in beam simultaneously
SMA alloy implement corresponding voltage drive, under the function of current, along with B alloy wire temperature raise, crystal inside state by
Martensite changes to austenite, and the plastic deformation produced in the martensitic state deforms therewith and produces restoring force and acts on coagulation
Soil, it is achieved oneself's healing of distress in concrete.
Compared with prior art, the invention have the advantage that
1. use memory alloy material make WELDING STUDS as connect the upper and lower parts of combination beam connector, mainly because of
For memorial alloy, there is non-linear super elastic characteristics, during its essence is by stress-induced martensitic phase transformation and reverse transformation thereof
In-fighting causes.During thermoelastic martensitic transformation, the anelasticity at each interface (twin plane, just body interface) in material
Migration needs to absorb substantial amounts of energy, and the stress-strain thus resulting in SMA material is non-linear, produces sluggish cyclical effect；
2. employing SMA material is not merely with its distinctive mechanical characteristic, and can be according to memorial alloy with temperature, strain amplitude
Relation under the situation of change of value, between alloy strain and resistance change rate, it is achieved that to the self-monitoring of distress in concrete and
Oneself's early warning；
3. using memorial alloy complex as the driving element of composite beam, reason is that it can be effective under current excitation
Enclosed member crack.
Accompanying drawing explanation
Fig. 1 is the prison selfreparing schematic diagram certainly of the combination beam of the present invention.
Fig. 2 is the cross-sectional view of the combination beam of the present invention.
Fig. 3 a and Fig. 3 b be respectively the combination beam of the present invention excitation before and after distress in concrete situation of change.
Detailed description of the invention
Seeing figures.1.and.2, intelligence is from monitoring selfreparing memorial alloy combination beam, including top concrete slab 1 and bottom work
Shaped steel 2, also includes the memorial alloy WELDING STUDS 3 as sensing element and is embedded in the concrete slab of top along beam length direction
Carbon fiber-memorial alloy complex 4, described memorial alloy WELDING STUDS 3 for connect described top concrete slab 1 and under
Portion's i shaped steel 2.
Further, described carbon fiber-memorial alloy complex 4, for driving element, is used for closing structure under current excitation
Part crack.
Further, described memorial alloy uses one-way memory effect alloy, and described one-way memory effect alloy is relatively
Deform under low temperature, after heating, can have the shape before efficient recovery deformation.
Further, also including that resistance alloys measures circuit 5 and alloy excitation drive circuit 6, described resistance alloys measures
Circuit 5 occurs the situation of fatigue crack during structure uses for measuring inside the concrete slab of top；Described alloy swashs
Encourage drive circuit 6 for outside to carbon fiber after memorial alloy electrified regulation-memorial alloy complex reset deformation.
Because implementing the difference of operation object, the Memory Alloy metal kind of selection and content and diameter are the most different,
Therefore the enforcement of the present embodiment mainly includes the following two stage:
1, preliminary stage mainly measures the material properties of B alloy wire, specifically includes that B alloy wire self character, shape memory
Alloy changes with plastic strain amplitude, the mechanical characteristic of variations in temperature, and resistance characteristic etc., particular content is as follows: the 1) Ovshinsky of B alloy wire
Bulk modulus, martensite elastic modelling quantity；2) low-temperature martensite load-deformation curve；3) high temperature austenite stress-strain is bent
Line；4) resistance change rate of differently strained lower B alloy wire；5) under current excitation heating state, differently strained B alloy wire correspondence is produced
Raw recovery stress situation.
2, follow-up phase mainly carries out the prison selfreparing stage certainly of SMA alloy combination beam internal fissure.With steel-concrete
As a example by combination beam, structural cracks the answering from monitoring selfreparing that top concrete is made along beam length direction embedment SMA alloy
Zoarium, complex, before embedment, need to carry out ultra stretching work, and reserved certain pre-stretching strain, B alloy wire is geneva at normal temperatures
Body, with being austenite after electrical heating.The most external two-way circuit, a road is that SMA material drives exciting circuit, for memorial alloy
Electrified regulation；Another road is that resistance alloys measures circuit, is used for measuring beams of concrete B alloy wire resistance during strain cracking
The change of value.
The concrete memorial alloy that the present embodiment uses is Ti-49.8Ni-50.2 B alloy wire, and its parameter see table 1.For
Drive exciting circuit to use low-voltage dc power supply, be made up of control module, voltage regulating module and rectification module.Adjustable voltage is: 0～
18V；Output electric current is: 0～80A.In case study on implementation, exciting current is the low-voltage DC of 25A, and the resistance wire of different resistance needs
It is equipped with the different magnitudes of current.
Table 1Ti-49.8Ni-50.2 B alloy wire specification and parameter
Entrance adds/unloads and after excitation phase, and be energized excitation to the SMA-carbon fiber complex in Transducers Embedded in Concrete, such as figure
3a and Fig. 3 b show complex and encourages the situation of change of forward and backward concrete crack width.After excitation, along with the increasing of alloy temperature
Adding, the martensitic phase in alloy is to austenite phase transition and produces bigger restoring force, and this restoring force acts on top concrete
Beam so that occur crack closure.
The measure mode of the present invention is also not restricted to the described embodiments, other any spirit without departing from the present invention
With the change made under principle, modify, substitute, combine, simplify, all should be the substitute mode of equivalence, be included in the present invention's
Within protection domain.
Claims (4)
1. intelligence is from monitoring selfreparing memorial alloy combination beam, and including top concrete slab and bottom i shaped steel, its feature exists
In: also include that the memorial alloy WELDING STUDS as sensing element and the carbon being embedded in the concrete slab of top along beam length direction are fine
Dimension-memorial alloy complex, described memorial alloy WELDING STUDS is for connecting described top concrete slab and bottom I shape
Steel.
2. intelligence as claimed in claim 1 is from monitoring selfreparing memorial alloy combination beam, it is characterised in that: described carbon is fine
Dimension-memorial alloy complex is for driving element, for enclosed member crack under current excitation.
3. intelligence as claimed in claim 2 is from monitoring selfreparing memorial alloy combination beam, it is characterised in that: described memory is closed
Gold uses one-way memory effect alloy, and described one-way memory effect alloy deforms at a lower temperature, can be the most extensive after heating
Shape before multiple deformation.
4. the intelligence as described in one of claims 1 to 3 is from monitoring selfreparing memorial alloy combination beam, it is characterised in that: also wrap
Including resistance alloys and measure circuit and alloy excitation drive circuit, described resistance alloys measures circuit and uses in structure for measuring
During the situation of fatigue crack occurs inside the concrete slab of top；Described alloy excitation drive circuit is used for outside to memory
After alloy electrified regulation, carbon fiber-memorial alloy complex resets and deforms.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610642382.7A CN106149545A (en) | 2016-08-04 | 2016-08-04 | Intelligent self-monitoring and self-repairing memory alloy composite beam |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201610642382.7A CN106149545A (en) | 2016-08-04 | 2016-08-04 | Intelligent self-monitoring and self-repairing memory alloy composite beam |
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| CN106149545A true CN106149545A (en) | 2016-11-23 |
Family
ID=57329177
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| CN201610642382.7A Pending CN106149545A (en) | 2016-08-04 | 2016-08-04 | Intelligent self-monitoring and self-repairing memory alloy composite beam |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107083962A (en) * | 2017-06-16 | 2017-08-22 | 浙江科技学院（浙江中德科技促进中心） | A kind of device that Shield-bored tunnels have been deformed based on marmem reparation |
| CN108798062A (en) * | 2018-07-10 | 2018-11-13 | 大连理工大学 | Steel-concrete interface damage monitoring based on marmem and reinforcement means |
| CN108917584A (en) * | 2018-07-10 | 2018-11-30 | 大连理工大学 | Composite structure column system is actively adjusted from perception based on marmem |
| CN111138137A (en) * | 2020-01-03 | 2020-05-12 | 重庆高途新材料科技有限公司 | Concrete with self-monitoring, diagnosis and repair functions and preparation method thereof |
| CN114263126A (en) * | 2021-12-30 | 2022-04-01 | 山东省路桥集团有限公司 | Method for intelligently controlling crack threshold of concrete beam through strain of SMA wire material or reinforcement material |
| CN114319154A (en) * | 2021-12-30 | 2022-04-12 | 山东省路桥集团有限公司 | Method for intelligently controlling deflection threshold of concrete beam through strain of SMA wire material or rib material |
| CN114438907A (en) * | 2021-12-30 | 2022-05-06 | 山东省路桥集团有限公司 | Method for intelligently controlling deflection threshold of concrete beam by resistivity of SMA wire material or rib material |
| CN117973079A (en) * | 2024-03-28 | 2024-05-03 | 山东科技大学 | Layered combined roof energy storage calculation method and system |
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Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107083962A (en) * | 2017-06-16 | 2017-08-22 | 浙江科技学院（浙江中德科技促进中心） | A kind of device that Shield-bored tunnels have been deformed based on marmem reparation |
| CN107083962B (en) * | 2017-06-16 | 2020-03-17 | 浙江科技学院（浙江中德科技促进中心） | Device for repairing deformed subway shield tunnel based on shape memory alloy |
| CN108798062A (en) * | 2018-07-10 | 2018-11-13 | 大连理工大学 | Steel-concrete interface damage monitoring based on marmem and reinforcement means |
| CN108917584A (en) * | 2018-07-10 | 2018-11-30 | 大连理工大学 | Composite structure column system is actively adjusted from perception based on marmem |
| CN111138137A (en) * | 2020-01-03 | 2020-05-12 | 重庆高途新材料科技有限公司 | Concrete with self-monitoring, diagnosis and repair functions and preparation method thereof |
| CN114263126A (en) * | 2021-12-30 | 2022-04-01 | 山东省路桥集团有限公司 | Method for intelligently controlling crack threshold of concrete beam through strain of SMA wire material or reinforcement material |
| CN114319154A (en) * | 2021-12-30 | 2022-04-12 | 山东省路桥集团有限公司 | Method for intelligently controlling deflection threshold of concrete beam through strain of SMA wire material or rib material |
| CN114438907A (en) * | 2021-12-30 | 2022-05-06 | 山东省路桥集团有限公司 | Method for intelligently controlling deflection threshold of concrete beam by resistivity of SMA wire material or rib material |
| CN114319154B (en) * | 2021-12-30 | 2024-03-12 | 山东省路桥集团有限公司 | Intelligent control method for deflection threshold of concrete beam by using SMA wire or rib strain |
| CN114438907B (en) * | 2021-12-30 | 2024-03-12 | 山东省路桥集团有限公司 | Method for intelligently controlling deflection threshold of concrete beam by using resistivity of SMA wire or rib |
| CN117973079A (en) * | 2024-03-28 | 2024-05-03 | 山东科技大学 | Layered combined roof energy storage calculation method and system |
| CN117973079B (en) * | 2024-03-28 | 2024-06-11 | 山东科技大学 | Layered combined roof energy storage calculation method and system |
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