CN108868184B - Carbon fiber reinforced steel structure and detection method - Google Patents
Carbon fiber reinforced steel structure and detection method Download PDFInfo
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- CN108868184B CN108868184B CN201810622060.5A CN201810622060A CN108868184B CN 108868184 B CN108868184 B CN 108868184B CN 201810622060 A CN201810622060 A CN 201810622060A CN 108868184 B CN108868184 B CN 108868184B
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04G—SCAFFOLDING; FORMS; SHUTTERING; BUILDING IMPLEMENTS OR AIDS, OR THEIR USE; HANDLING BUILDING MATERIALS ON THE SITE; REPAIRING, BREAKING-UP OR OTHER WORK ON EXISTING BUILDINGS
- E04G23/00—Working measures on existing buildings
- E04G23/02—Repairing, e.g. filling cracks; Restoring; Altering; Enlarging
- E04G23/0218—Increasing or restoring the load-bearing capacity of building construction elements
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
- G01N27/02—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance
- G01N27/04—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance by investigating resistance
- G01N27/041—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance by investigating resistance of a solid body
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Abstract
The invention provides a carbon fiber reinforced steel structure which comprises a reinforced structure body, wherein the reinforced structure body comprises a steel plate layer and a carbon fiber layer; the reinforced structure body further comprises a conductive connecting layer; the conductive connecting layer is made of a conductive adhesive; the steel plate layer and the carbon fiber layer are connected into a whole through the conductive connecting layer, and the steel plate layer and the carbon fiber layer are electrically conducted through the conductive connecting layer. The invention also relates to a carbon fiber reinforced steel detection method. The invention utilizes the self conductive property of the conductive adhesive to detect the deformation damage in the whole life cycle of the carbon fiber reinforced steel structure and carry out safety early warning by detecting the resistance change caused by the deformation of the reinforced structure body, thereby achieving the purpose of self-checking. The invention realizes the detection in a long-term whole life cycle, has low cost, does not need to use additional detection technology, can complete the detection only by arranging electrodes on the carbon fiber and the steel and measuring the resistance, has good universality and has the advantages of simple process and harmlessness.
Description
Technical Field
The invention relates to a steel structure, in particular to a carbon fiber reinforced steel structure and a detection method.
Background
In the steel structure buildings, because the environments of the steel structures are different, various damages and defects can be caused inevitably due to external loads or human factors, and the traditional reinforcing processes such as welding, bolt connection and the like have the limitation of more defects. However, as a novel reinforcing material, the carbon fiber material has an elastic modulus similar to that of steel, but has a strength five times that of a steel bar, has the advantages of light weight, easiness in forming, good corrosion resistance and durability, good fatigue resistance, convenience in construction and the like, and the advantages of the carbon fiber material can perfectly overcome the defects of the methods, so that the carbon fiber material can be widely applied to steel structure repair and reinforcement.
In recent engineering applications, there are the following methods of testing carbon fiber reinforced steel:
the principle of ray detection is as follows: when the X-ray transmitted by the X-ray tube meets the air holes, dregs, cracks, etc., the defects can reduce the absorption and scattering of the X-ray, so that the images with dense structures on the negative film or the fluorescent screen can be different to form images with different blackness, thereby judging the internal defects of the component. The following disadvantages mainly exist: (1) it is suitable for inspecting thin workpieces but not thick workpieces; (2) the detection cost is high; (3) the detection speed is slow; (4) the radiation is harmful to the human body.
II, an ultrasonic detection principle: the ultrasonic wave interacts with the member, reflected, transmitted and scattered waves are researched, and macroscopic defect detection, geometric characteristic detection and detection of change of tissue structure and mechanical property are carried out on the member, so that the characteristic of the member is evaluated. The following disadvantages mainly exist: (1) the device is suitable for inspecting structures with larger thickness and is not suitable for inspecting thinner structures; (2) irregular shapes and some structures of the workpiece can affect detection; (3) uneven or rough surfaces can affect coupling and scanning, thereby affecting detection accuracy and reliability.
Thirdly, the principle of magnetic particle detection: after the ferromagnetic material is magnetized, the magnetic force lines on the surface of the component are locally distorted to generate magnetic flux leakage, and the magnetic powder on the surface of the component is adsorbed to show discontinuous positions, shapes and sizes. The following disadvantages mainly exist: (1) surface and near-surface defects can be inspected and cannot be used for inspecting internal defects; (2) the shape and size of the workpiece sometimes have an effect on detection, and are difficult to magnetize and thus cannot be detected.
Fourthly, the principle of penetration detection: the surface of the member is coated with penetrant containing fluorescent dye or coloring dye, the penetrant can permeate into the surface opening defect after a period of time under the action of capillary, then the developer is coated on the surface, the permeation liquid in the defect is absorbed back into the developer, and under the action of a certain light source, the penetrant trace is realized, so that the shape and the distribution state of the defect are detected. The following disadvantages mainly exist: (1) the defect of the surface opening can be detected, but the buried defect or the closed surface defect cannot be detected; (2) the detection procedures are multiple, and the speed is low; (3) the material is expensive and the cost is high; (4) some materials are flammable and toxic.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention aims to provide a carbon fiber reinforced steel structure, which utilizes the conductive characteristic of a conductive adhesive and detects the deformation damage of the carbon fiber reinforced steel structure in the whole life cycle by detecting the resistance change caused by the deformation of a reinforced structure body and carrying out safety early warning. Because the binder for connecting the steel and the carbon fiber is originally non-conductive, the invention uses the conductive adhesive, thereby changing the whole reinforced structure body into a conductive structure, and obtaining the deformation damage information of the structure by using the resistance change of the body so as to achieve the purpose of self-checking.
The invention provides a carbon fiber reinforced steel structure which comprises a reinforced structure body, wherein the reinforced structure body comprises a steel plate layer and a carbon fiber layer; the reinforced structure body further comprises a conductive connecting layer; the conductive connection layer is made of a conductive adhesive; the steel plate layer and the carbon fiber layer are connected into a whole through the conductive connecting layer, and the conductive connecting layer is electrically conducted with the steel plate layer and the carbon fiber layer.
Preferably, a carbon fiber reinforced steel structure further comprises at least two electrodes; the electrodes are fixedly arranged on the surface of the steel plate layer or the surface of the carbon fiber layer.
Preferably, at least two of the electrodes are fixedly mounted on the surface of the carbon fiber layer while at least two of the electrodes are fixedly mounted on the surface of the steel plate layer.
Preferably, four electrodes are fixedly mounted on the carbon fiber layer.
Preferably, the steel plate layer, the conductive connecting layer and the carbon fiber layer are sequentially stacked to form the reinforced structure body; and a plurality of pairs of electrodes are symmetrically distributed on two sides of the reinforced structure body.
Preferably, the conductive adhesive is a conductive resin.
A carbon fiber reinforced steel detection method comprises the following steps:
electrifying, wherein any two electrodes on the reinforced structure body are connected with a constant current source or a constant voltage source and are electrified and conducted;
measuring, wherein two active electrodes on the reinforced structure body are connected into a voltage detection circuit to detect the voltage between the two electrodes;
monitoring, namely obtaining a monitoring resistance value of the reinforced structure body between the two active electrodes according to ohm's law and comparing the monitoring resistance value with a standard threshold value, and if the monitoring resistance value exceeds the standard threshold value, marking the monitoring resistance value as abnormal and giving an alarm.
Preferably, the two electrodes connected to the constant current source or the constant voltage source are simultaneously located on the carbon fiber layer of the reinforced structure body, and the two electrodes connected to the voltage detection circuit are also simultaneously located on the carbon fiber layer of the reinforced structure body.
Preferably, the two electrodes connected to the constant current source or the constant voltage source are respectively located on the carbon fiber layer and the steel plate layer of the reinforced structure body, and the electrodes connected to the voltage detection circuit are also respectively located on the carbon fiber layer and the steel plate layer of the reinforced structure body.
Preferably, the two electrodes connected to the constant current source are symmetrically distributed on two sides of the reinforced structure body, and the electrodes connected to the constant current source are the same as the electrodes connected to the voltage detection circuit.
Compared with the prior art, the invention has the beneficial effects that:
the invention provides a carbon fiber reinforced steel structure which comprises a reinforced structure body, wherein the reinforced structure body comprises a steel plate layer and a carbon fiber layer; the reinforced structure body further comprises a conductive connecting layer; the conductive connecting layer is made of a conductive adhesive; the steel plate layer and the carbon fiber layer are connected into a whole through the conductive connecting layer, and the steel plate layer and the carbon fiber layer are electrically conducted through the conductive connecting layer. The invention also relates to a carbon fiber reinforced steel detection method, which comprises the following steps: electrifying, wherein any two electrodes on the reinforced structure body are connected with a constant current source or a constant voltage source and are electrified and conducted; measuring, wherein two active electrodes on the reinforced structure body are connected into a voltage detection circuit to detect the voltage between the two electrodes; monitoring, namely obtaining a monitoring resistance value of the reinforced structure body between the two active electrodes according to ohm's law and comparing the monitoring resistance value with a standard threshold value, and if the monitoring resistance value exceeds the standard threshold value, marking the monitoring resistance value as abnormal and giving an alarm. According to the invention, the deformation damage of the carbon fiber reinforced steel structure in the whole life cycle is detected and safely warned by utilizing the conductive characteristic of the conductive adhesive and detecting the resistance change caused by the deformation of the reinforced structure body. Because the binder for connecting the steel and the carbon fiber is originally non-conductive, the invention uses the conductive adhesive, thereby changing the whole reinforced structure body into a conductive structure, and obtaining the deformation damage information of the structure by using the resistance change of the body so as to achieve the purpose of self-checking. The technology provided by the invention can be used for detecting in a long-term whole life cycle, is low in cost, does not need to use an additional detection technology, can complete detection only by arranging electrodes on carbon fibers and steel and measuring resistance, is good in universality, and has the advantages of simple process and harmlessness.
The foregoing description is only an overview of the technical solutions of the present invention, and in order to make the technical solutions of the present invention more clearly understood and to implement them in accordance with the contents of the description, the following detailed description is given with reference to the preferred embodiments of the present invention and the accompanying drawings. The detailed description of the present invention is given in detail by the following examples and the accompanying drawings.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the invention and together with the description serve to explain the invention without limiting the invention. In the drawings:
FIG. 1 is a first structural schematic view of a carbon fiber reinforced steel structure according to the present invention;
FIG. 2 is a schematic structural view of a carbon fiber reinforced steel structure according to the present invention;
FIG. 3 is a schematic structural view III of a carbon fiber reinforced steel structure according to the present invention;
fig. 4 is a schematic structural diagram of a carbon fiber reinforced steel structure according to the present invention.
In the figure: steel plate layer 1, carbon fiber layer 2, conductive connecting layer 3, electrode 4.
Detailed Description
The present invention will be further described with reference to the accompanying drawings and the detailed description, and it should be noted that any combination of the embodiments or technical features described below can be used to form a new embodiment without conflict.
A carbon fiber reinforced steel structure comprises a reinforced structure body, as shown in figure 1, the reinforced structure body comprises a steel plate layer 1 and a carbon fiber layer 2; the reinforced structure body further comprises a conductive connecting layer 3; the conductive connection layer 3 is made of a conductive adhesive; the steel plate layer 1 and the carbon fiber layer 2 are connected into a whole through the conductive connecting layer 3, and the conductive connecting layer 3 is electrically connected with the steel plate layer 1 and the carbon fiber layer 2. In an embodiment, a carbon fiber reinforced steel structure further comprises at least two electrodes 4; as shown in fig. 1, two electrodes 4 are fixedly mounted on the surface of the steel plate layer 1 or the surface of the carbon fiber layer 2; correspondingly, the carbon fiber reinforced steel detection method comprises the following steps:
electrifying, wherein any two electrodes on the reinforced structure body are connected with a constant current source or a constant voltage source and are electrified and conducted;
measuring, wherein two active electrodes on the reinforced structure body are connected into a voltage detection circuit to detect the voltage between the two electrodes;
monitoring, namely obtaining a monitoring resistance value of the reinforced structure body between the two active electrodes according to ohm's law and comparing the monitoring resistance value with a standard threshold value, and if the monitoring resistance value exceeds the standard threshold value, marking the monitoring resistance value as abnormal and giving an alarm. The standard threshold value is a resistance value range when the carbon fiber reinforced steel structure is effective; in the power-on process, the power-on can be carried out in a mode of pulse constant current, pulse constant voltage or continuous safe constant current and continuous safe constant voltage, so that the safety is ensured.
In an embodiment, as shown in fig. 2 and fig. 3, in order to avoid the influence of the self resistance of the lead of the electrode 4, the two electrified electrodes are two electrodes for non-measurement, wherein the two electrodes near the outer side are the electrified electrodes, the two electrodes near the inner side are the two electrodes detected by the voltage detection circuit in the measurement step, in practical application, as shown in fig. 2, at least two electrodes 4 are fixedly installed on the surface of the carbon fiber layer 2 while at least two electrodes 4 are fixedly installed on the surface of the steel plate layer 1, the two electrodes connected to the constant current source are respectively located on the carbon fiber layer 2 and the steel plate layer 1 of the reinforced structure body, and the electrodes connected to the voltage detection circuit are also respectively located on the carbon fiber layer 2 and the steel plate layer 1 of the reinforced structure body; the method for detecting the carbon fiber reinforced steel adopts a different-side four-electrode method, a constant-current power supply or a constant-voltage power supply is connected to two electrodes close to the outer side, a voltage detection circuit is connected to the two electrodes close to the inner side to detect voltage, the resistance of a reinforced structure body between the two electrodes close to the inner side is obtained through ohm's law, and is compared with a standard threshold value to judge whether to give an alarm or not; as shown in fig. 3, the four electrodes 4 are fixedly mounted on the carbon fiber layer 2, two electrodes connected to the constant current source are simultaneously located on the carbon fiber layer 2 of the reinforced structure body, and two electrodes connected to the voltage detection circuit are also simultaneously located on the carbon fiber layer 2 of the reinforced structure body; the method for detecting the carbon fiber reinforced steel adopts a same-side four-electrode method, a constant-current power supply or a constant-voltage power supply is connected to two electrodes close to the outer side, a voltage detection circuit is connected to the two electrodes close to the inner side to detect voltage, the resistance of a reinforced structure body between the two electrodes close to the inner side is obtained through ohm's law, and is compared with a standard threshold value to judge whether to give an alarm or not; as shown in fig. 1 and 3, the same-side electrode is suitable for the situation that the electrode is not conveniently arranged on the steel structure, and is especially suitable for reinforcing a bridge by carbon fiber.
The steel plate layer 1, the conductive connecting layer 3 and the carbon fiber layer 2 are sequentially stacked to form the reinforced structure body; as shown in fig. 4, a plurality of pairs of the electrodes 4 are symmetrically distributed on two sides of the reinforced structure body, two electrodes connected to the constant current source are symmetrically distributed on two sides of the reinforced structure body, the electrodes connected to the constant current source are the same as the electrodes connected to the voltage detection circuit, as shown in fig. 4, 5 pairs of the electrodes 4 are symmetrically distributed on two sides of the reinforced structure body, each pair of the electrodes 4 are simultaneously connected to the constant current source and the voltage detection circuit, and a segmented electrode method is adopted to measure the resistance value of the reinforced structure body between each pair of the electrodes, so that segmented monitoring of the reinforced structure body is realized, particularly, more accurate measurement is needed for the most fragile point during bridge span, and a segmented multi-electrode method is adopted, so that.
Preferably, the conductive adhesive is a conductive resin. For example, conductive epoxy resin, a conductive polymer material obtained by compounding epoxy resin as a matrix material and a conductive filler material; among them, the epoxy resin itself is a linear polymer, and is different depending on the structure and molecular weight. Is liquid or solid at normal temperature and can be dissolved in various organic solvents. When in use, the resin and a curing agent react to generate a crosslinking reaction to form the crosslinking thermosetting plastic, and the generated resin is a polymer material with good mechanical property and electrical property. The epoxy resin has strong bonding force, and can be compounded with conductive materials (carbon black or silver powder) to form a conductive cementing agent and a conductive coating.
The deformation damage in the whole life cycle of the carbon fiber reinforced steel structure is detected and safely warned by utilizing the conductive characteristic of the conductive adhesive and the resistance change caused by detecting the deformation of the reinforced structure body. Because the binder for connecting the steel and the carbon fiber is originally non-conductive, the invention uses the conductive adhesive, thereby changing the whole reinforced structure body into a conductive structure, and obtaining the deformation damage information of the structure by using the resistance change of the body so as to achieve the purpose of self-checking. The technology provided by the invention can be used for detecting in a long-term whole life cycle, is low in cost, does not need to use an additional detection technology, can complete detection only by arranging electrodes on carbon fibers and steel and measuring resistance, is good in universality, and has the advantages of simple process and harmlessness.
The foregoing is merely a preferred embodiment of the invention and is not intended to limit the invention in any manner; those skilled in the art can readily practice the invention as shown and described in the drawings and detailed description herein; however, those skilled in the art should appreciate that they can readily use the disclosed conception and specific embodiments as a basis for designing or modifying other structures for carrying out the same purposes of the present invention without departing from the scope of the invention as defined by the appended claims; meanwhile, any changes, modifications, and evolutions of the equivalent changes of the above embodiments according to the actual techniques of the present invention are still within the protection scope of the technical solution of the present invention.
Claims (9)
1. A carbon fiber reinforced steel structure comprises a reinforced structure body, wherein the reinforced structure body comprises a steel plate layer (1) and a carbon fiber layer (2); the method is characterized in that: the reinforced structure body further comprises a conductive connection layer (3); the conductive connection layer (3) is made of a conductive adhesive; the steel plate layer (1) and the carbon fiber layer (2) are connected into a whole through the conductive connecting layer (3), and the conductive connecting layer (3) electrically conducts the steel plate layer (1) and the carbon fiber layer (2); also comprises at least two electrodes (4); the electrodes (4) are fixedly arranged on the surface of the steel plate layer (1) or the surface of the carbon fiber layer (2).
2. The carbon fiber reinforced steel structure of claim 1, wherein: at least two electrodes (4) are fixedly arranged on the surface of the carbon fiber layer (2) and at least two electrodes (4) are fixedly arranged on the surface of the steel plate layer (1).
3. The carbon fiber reinforced steel structure of claim 1, wherein: and the electrodes (4) are fixedly arranged on the carbon fiber layer (2).
4. The carbon fiber reinforced steel structure of claim 1, wherein: the steel plate layer (1), the conductive connecting layer (3) and the carbon fiber layer (2) are sequentially stacked to form the reinforced structure body; the two sides of the reinforced structure body are symmetrically provided with a plurality of pairs of electrodes (4).
5. A carbon fibre reinforced steel structure as claimed in any one of claims 1 to 4, wherein: the conductive adhesive is a conductive resin.
6. The detection method for the carbon fiber reinforced steel is characterized by comprising the following steps:
powering on, any two electrodes on the reinforced structure body of claim 1 are connected to a constant current source or a constant voltage source and are electrically conducted;
measuring, wherein two active electrodes on the reinforced structure body are connected into a voltage detection circuit to detect the voltage between the two electrodes;
monitoring, namely obtaining a monitoring resistance value of the reinforced structure body between the two active electrodes according to ohm's law and comparing the monitoring resistance value with a standard threshold value, and if the monitoring resistance value exceeds the standard threshold value, marking the monitoring resistance value as abnormal and giving an alarm.
7. The method for detecting the carbon fiber reinforced steel as claimed in claim 6, wherein: two electrodes connected with a constant current source or a constant voltage source are simultaneously positioned on the carbon fiber layer (2) of the reinforced structure body, and two electrodes connected with a voltage detection circuit are also simultaneously positioned on the carbon fiber layer (2) of the reinforced structure body.
8. The method for detecting the carbon fiber reinforced steel as claimed in claim 6, wherein: two electrodes connected with a constant current source or a constant voltage source are respectively positioned on the carbon fiber layer (2) and the steel plate layer (1) of the reinforced structure body, and electrodes connected with a voltage detection circuit are also respectively positioned on the carbon fiber layer (2) and the steel plate layer (1) of the reinforced structure body.
9. The method for detecting the carbon fiber reinforced steel as claimed in claim 8, wherein: the two electrodes connected to the constant current source are symmetrically distributed on two sides of the reinforced structure body, and the electrodes connected to the constant current source are the same as the electrodes connected to the voltage detection circuit.
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| CN109406582A (en) * | 2018-12-28 | 2019-03-01 | 南水北调东线总公司 | A kind of Structure Damage Identification using carbon fiber change in resistance |
| CN109632897A (en) * | 2019-01-07 | 2019-04-16 | 中材科技股份有限公司 | A kind of damage detecting method of conductive fiber tow |
| CN111852062A (en) * | 2020-03-19 | 2020-10-30 | 同济大学 | Device for reinforcing and monitoring fatigue performance of steel member by using carbon nanotube carbon fiber plate |
| CN113250482A (en) * | 2021-05-12 | 2021-08-13 | 三峡大学 | Device and method for sealing floor slab cracks through magnetic slurry |
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| CN104233964B (en) * | 2014-09-30 | 2016-05-18 | 长安大学 | The CFRP cloth reinforcing construction of steel girder bridge welded K-joint of steel tubular |
| CN204898522U (en) * | 2015-05-19 | 2015-12-23 | 山西省交通科学研究院 | Light weight, high strength steel bridge deck pavement structure |
| CN106285036A (en) * | 2016-09-13 | 2017-01-04 | 广东工业大学 | Pre-stress fibre strengthens Composite patch reinforcement corrosion concrete structure and reinforcement means |
| CN106481092A (en) * | 2016-12-08 | 2017-03-08 | 广东工业大学 | A kind of anti-corrosion bracing means of pre-stressed carbon fiber reinforced steel concrete |
| CN106970197A (en) * | 2017-05-05 | 2017-07-21 | 长沙理工大学 | Monitoring system and method for CFRP (carbon fiber reinforced plastics) plate reinforced steel box girder cracks |
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