CN216051494U - Monitoring system for bonding strength of steel beam and carbon fiber plate - Google Patents
Monitoring system for bonding strength of steel beam and carbon fiber plate Download PDFInfo
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- CN216051494U CN216051494U CN202122216485.6U CN202122216485U CN216051494U CN 216051494 U CN216051494 U CN 216051494U CN 202122216485 U CN202122216485 U CN 202122216485U CN 216051494 U CN216051494 U CN 216051494U
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Abstract
The utility model provides a monitoring system for the bonding strength of a steel beam and a carbon fiber plate, which comprises the steel beam, a CFRP plate, a signal generating unit, a signal exciting assembly, a signal sensing assembly and a signal receiving unit, wherein the CFRP plate is fixedly arranged on the end surface of the steel beam and arranged along the extending direction of the steel beam; the steel beam comprises a rib plate and two supporting parts, and the CFRP plate is fixedly arranged on the end face, far away from the rib plate, of one supporting part; the signal excitation assembly is arranged on the end face, far away from the supporting part, of the CFRP plate; the signal generating unit is arranged outside the steel beam, electrically connected with the signal exciting assembly and used for sending a detection exciting signal to the signal exciting assembly; the signal induction assembly is arranged on the end face of one side, close to the ribbed plate, of the supporting part where the CFRP plate is located; the signal receiving unit is electrically connected with the signal sensing assembly, and the signal sensing assembly outputs a response signal to the signal receiving unit after receiving the detection excitation signal sent by the signal excitation assembly.
Description
Technical Field
The utility model relates to the technical field of structural reinforcement and health monitoring equipment, in particular to a monitoring system for the bonding strength of a steel beam and a carbon fiber plate.
Background
The carbon fiber reinforced polymer material, namely CFRP has the characteristics of convenience in installation, good corrosion resistance, high strength-to-weight ratio and the like, and is widely applied to steel structure reinforcement. The CFRP plate is adhered to the tension area of the structure, so that the steel structure can be effectively reinforced and the safety of the steel structure can be ensured. However, the degumming between the steel structure and the reinforced CFRP panel is one of the main failure modes of the reinforced CFRP panel, which not only affects the reinforcing effect, but also may cause the sudden failure of the structure. Most of the conventional methods such as acoustic emission technology, ultrasonic inspection technology, and X-ray inspection require complicated equipment. And the field limiting factors are more during detection.
The piezoelectric ceramic, namely PZT is a material capable of mutually converting mechanical energy and electric energy, has the specific sensing and action functions which can be applied to the field of civil engineering, and has the characteristics of quick response, wide frequency range, easy cutting and the like. Therefore, the piezoelectric ceramic is applied to the field of nondestructive testing after the steel structure and the CFRP plate are reinforced, and the convenience and the reliability of the testing can be improved inevitably.
SUMMERY OF THE UTILITY MODEL
In view of this, the utility model provides a monitoring system for the bonding strength between a steel beam and a carbon fiber plate, which is convenient to install and reliable to use without damaging the internal and external structures of the steel beam.
The technical scheme of the utility model is realized as follows: the utility model provides a monitoring system for the bonding strength of a steel beam and a carbon fiber plate, which comprises a steel beam (1), a CFRP plate (2), a signal generating unit (3), a signal exciting assembly (4), a signal sensing assembly (5) and a signal receiving unit (6); the CFRP plate (2) is fixedly arranged on the end face of the steel beam (1) and arranged along the extending direction of the steel beam (1);
the steel beam (1) comprises a rib plate (11) and two supporting parts (12), the two supporting parts (12) are parallel and arranged at intervals, and the rib plate (11) is arranged between the two supporting parts (12) and is respectively and fixedly connected with the two supporting parts (12); the CFRP plate (2) is fixedly arranged on the end face, far away from the ribbed slab (11), of a supporting part (12);
the signal excitation assembly (4) is arranged on the end face, far away from the supporting part (12), of the CFRP plate (2), and the signal excitation assembly (4) is detachably connected with the CFRP plate (2) or the steel beam (1);
the signal generating unit (3) is arranged outside the steel beam (1), the signal generating unit (3) is electrically connected with the signal exciting assembly (4), and the signal generating unit (3) sends a detection exciting signal to the signal exciting assembly (4);
the signal induction component (5) is arranged on the end face of one side, close to the rib plate (11), of the supporting part (12) where the CFRP plate (2) is located, and the signal induction component (5) is detachably connected with the steel beam (1);
the signal receiving unit (6) is arranged outside the steel beam (1), the signal receiving unit (6) is electrically connected with the signal sensing assembly (5), and the signal sensing assembly (5) outputs a response signal to the signal receiving unit (6) after receiving the detection excitation signal sent by the signal excitation assembly (4).
On the basis of the above technical solution, preferably, the signal excitation assembly (4) includes a first housing (41), a first end cap (42), and a first piezoceramic device (43); one end of the first shell (41) is provided with a first blind hole (44), the first blind hole (44) is arranged along the axial extension direction of the first shell (41), and one end of the first blind hole (44) is communicated with the outside; the first piezoelectric ceramic device (43) is fixedly arranged in the first blind hole (44); the first end cover (42) is arranged at the end part of the first blind hole (44) and seals the first blind hole (44), and the first end cover (42) is respectively abutted against the first piezoelectric ceramic device (43) and the first shell (41); a through cable hole is formed in the first end cover (42), and the first piezoelectric ceramic device (43) is electrically connected with the signal generating unit (3) through a first cable penetrating through the cable hole; one end of the first shell (41) far away from the first blind hole (44) is detachably connected with the CFRP plate (2) or the steel beam (1).
Further preferably, the signal sensing assembly (5) comprises a second shell (51), a second end cover (52) and a second piezoelectric ceramic device (53); one end of the second shell (51) is provided with a second blind hole (54), the second blind hole (54) is arranged along the axial extension direction of the second shell (51), and one end of the second blind hole (54) is communicated with the outside; the second piezoelectric ceramic device (53) is fixedly arranged in the second blind hole (54), the second end cover (52) is arranged at the end part of the second blind hole (54) and seals the second blind hole (54), and the second end cover (52) is respectively abutted against the second shell (51) and the second piezoelectric ceramic device (53); a through cable hole is also formed in the second end cover (52), and the second piezoelectric ceramic device (53) is electrically connected with the signal receiving unit (6) through a second cable penetrating through the cable hole; one end of the second shell (51) far away from the second blind hole (54) is detachably connected with the supporting part (12).
Further preferably, the first housing (41) or the second housing (51) is made of a magnetic material, and the first housing (41) or the second housing (51) is magnetically connected to the support portion (12).
Further preferably, an insulating adhesive layer (7) is further arranged between an end face of the first piezoceramic device (43) along the axial extension direction of the first shell (41) and the first shell (41) or the first end cap (42); an insulating adhesive layer (7) is also arranged between the end face of the second piezoelectric ceramic device (53) along the axial extension direction of the second shell (51) and the second shell (51) or the second end cover (52).
Still more preferably, a central axis of the first blind hole (44) is coincident with a central axis of the first housing (41); the central axis of the second blind hole (54) is superposed with the central axis of the second shell (51); the central axis of the first housing (41) and the central axis of the second housing (51) are located in the same vertical plane.
Still further preferably, the signal receiving unit (6) includes a signal acquisition card (61) and a signal processing terminal (62), the signal acquisition card (61) is electrically connected to the second cable, and the signal acquisition card (61) is further electrically connected to the signal processing terminal (62).
Still further preferably, the insulating adhesive layer (7) is made of epoxy resin.
Compared with the prior art, the monitoring system for the bonding strength of the steel beam and the carbon fiber plate has the following beneficial effects that:
(1) the detachable detection device is arranged on a steel beam to be detected or a CFRP plate through a detachable structure, the position adjustment is very convenient, the signal generation unit generates an excitation signal to excite the signal excitation assembly, the signal induction assembly further receives a corresponding detection excitation signal and then generates a corresponding response signal, and the signal receiving unit further analyzes and processes the response signal;
(2) the signal excitation assembly and the signal induction assembly have similar structures and are interchangeable;
(3) the first shell or the second shell is made of ferromagnetic materials, and the relative position of the first shell or the second shell on the steel beam can be changed at will;
(4) the insulating adhesive layer can perform waterproof sealing and insulating treatment on the first piezoelectric ceramic device or the second piezoelectric ceramic device.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a block diagram of a system for monitoring the bonding strength of a steel beam and a carbon fiber plate according to the present invention;
FIG. 2 is a front view, partly in section, of a signal excitation assembly of a system for monitoring the bonding strength of a steel beam and a carbon fiber plate according to the present invention;
FIG. 3 is a top view of a signal excitation assembly of a system for monitoring the bonding strength of a steel beam and a carbon fiber plate according to the present invention;
FIG. 4 is a front view, partly in section, of a signal sensing assembly of a system for monitoring the bonding strength of a steel beam and a carbon fiber plate according to the present invention;
FIG. 5 is a front view of the combination state of the steel beam, the CFRP plate, the signal excitation assembly and the signal sensing assembly of the monitoring system for the bonding strength of the steel beam and the carbon fiber plate;
fig. 6 is a right side view of a combination state of the steel beam, the CFRP board, the signal excitation assembly and the signal sensing assembly of the monitoring system for the bonding strength of the steel beam and the carbon fiber board according to the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, are within the scope of the present invention.
As shown in fig. 1 in combination with fig. 5 and 6, the utility model provides a monitoring system for the bonding strength of a steel beam and a carbon fiber plate, which comprises a steel beam 1, a CFRP plate 2, a signal generating unit 3, a signal exciting assembly 4, a signal sensing assembly 5 and a signal receiving unit 6;
the CFRP plate 2 is fixedly arranged on the end face of the steel beam 1 and arranged along the extending direction of the steel beam 1; the CFRP plate 2 is fixedly connected with the end face of the steel beam 1 usually in a bonding mode; specifically, the steel beam 1 comprises a rib plate 11 and two supporting parts 12, the two supporting parts 12 are arranged in parallel and at intervals, and the rib plate 11 is arranged between the two supporting parts 12 and is respectively fixedly connected with the two supporting parts 12; the CFRP plate 2 is fixedly arranged on the end face, far away from the ribbed slab 11, of one supporting part 12; the CFRP plate 2 is arranged at the position of a contact surface of the steel beam and an external object;
the signal excitation assembly 4 is arranged on the end face, far away from the supporting part 12, of the CFRP plate 2, and the signal excitation assembly 4 is detachably connected with the CFRP plate 2 or the steel beam 1; the signal excitation assembly 4 is arranged on the outer surface of the CFRP plate 2 and is used for outputting a detection excitation signal;
the signal generating unit 3 is arranged outside the steel beam 1, the signal generating unit 3 is electrically connected with the signal exciting assembly 4, and the signal generating unit 3 sends a detection exciting signal to the signal exciting assembly 4;
the signal induction component 5 is arranged on the end face of one side, close to the ribbed plate 11, of the supporting part 12 where the CFRP plate 2 is located, and the signal induction component 5 is detachably connected with the steel beam 1;
the signal receiving unit 6 is arranged outside the steel beam 1, the signal receiving unit 6 is electrically connected with the signal induction component 5, and the signal induction component 5 outputs a response signal to the signal receiving unit 6 after receiving the detection excitation signal sent by the signal excitation component 4.
When the utility model works, the signal generating unit 3 generates a sweep frequency excitation electric signal with a certain frequency band, after the sweep frequency detection excitation signal is transmitted to the signal excitation assembly 4, the signal excitation assembly 4 transmits a sweep frequency excitation detection signal to the connecting part of the CFRP plate 2 and the steel beam 1, after the signal induction assembly 5 positioned at the other side of the same supporting part 12 receives the sweep frequency excitation detection signal, the signal is converted into a response signal, the response signal is transmitted to the signal receiving unit 6, and the signal receiving unit 6 carries out further processing.
When the connecting part of the CFRP plate 2 and the steel beam 1 is reliably connected, the measured response signal is used as a reference signal, a related characteristic identification parameter reference value is constructed, the response signal corresponding to the CFRP plate 2 and the steel beam 1 in different periods is continuously detected, the response signal is compared with the characteristic identification parameter reference value, a judgment index of the bonding strength of the CFRP plate 2 and the steel beam 1 is calculated, and the larger the defined judgment index value is, the firmer the connection of the CFRP plate 2 and the steel beam 1 is, the smaller the current judgment index value is, and the unreliable connection state of the CFRP plate 2 and the steel beam 1 is.
The reference measurement of the connection state of the CFRP panel 2 and the steel beam 1 can be performed by the following method: let the energy value of the signal received by the signal sensing component 5 be E, which can be expressed as
Wherein, tsAnd tfSub-tables indicate the initial time and the end time of the signal received by the signal sensing component 5, y (t) and fsRespectively representing discrete sample values and sampling frequency of the signal received by the signal sensing component 5. In this case, the relative change rate R of the response signal energy value received by the signal sensing component 5, which is the peeling judgment index of the steel beam 1 and CFRP plate 2 combined structure, is determined byThe following formula is calculated:
wherein E istRepresenting the measured energy value of the response signal between the steel beam 1 and the CFRP plate 2, E0The response signal energy value in the good bonding state is shown, namely the reference value. The method of calculating the energy value of the response signal described herein is merely one example.
As shown in fig. 1 in conjunction with fig. 2 and 3, the signal excitation assembly 4 includes a first housing 41, a first end cap 42, and a first piezoceramic device 43; one end of the first housing 41 is provided with a first blind hole 44, the first blind hole 44 is arranged along the axial extension direction of the first housing 41, and one end of the first blind hole 44 is communicated with the outside; the first piezoceramic device 43 is fixedly arranged in the first blind hole 44; the first end cap 42 is provided at an end of the first blind hole 44 to close the first blind hole 44, and the first end cap 42 abuts against the first piezoelectric ceramic device 43 and the first case 41, respectively; a through cable hole is formed in the first end cover 42, and the first piezoelectric ceramic device 43 is electrically connected with the signal generating unit 3 through a first cable passing through the cable hole; one end of the first housing 41 away from the first blind hole 44 is detachably connected to the CFRP plate 2 or the steel beam 1.
As shown in fig. 4, the signal sensing assembly 5 includes a second housing 51, a second end cap 52 and a second piezoceramic device 53; one end of the second housing 51 is provided with a second blind hole 54, the second blind hole 54 is arranged along the axial extension direction of the second housing 51, and one end of the second blind hole 54 is communicated with the outside; the second piezoelectric ceramic device 53 is fixedly arranged in the second blind hole 54, the second end cap 52 is arranged at the end part of the second blind hole 54 and seals the second blind hole 54, and the second end cap 52 is respectively abutted with the second shell 51 and the second piezoelectric ceramic device 53; a through cable hole is also formed in the second end cap 52, and the second piezoelectric ceramic device 53 is electrically connected with the signal receiving unit 6 through a second cable passing through the cable hole; one end of the second housing 51 away from the second blind hole 54 is detachably connected to the supporting portion 12. The signal sensing component 5 is used for reliably mounting and protecting the second piezoceramic device 53, and it should be noted that the signal sensing component 5 and the signal excitation component 4 have interchangeability, so that the utility model is more convenient and reliable.
In the present invention, the first case 41 or the second case 51 is made of a magnetic material, and the first case 41 or the second case 51 is magnetically connected to the support portion 12. The material has enough adsorption capacity to the steel beam 1 made of steel materials, and is particularly convenient to mount and dismount. Of course, the first housing 41 may also be connected to the steel beam 1 or the CFRP board 2 by other detachable structures, such as velcro, and bolt fastening, which are not described herein again.
An insulating bonding layer 7 is further arranged between the end face of the first piezoelectric ceramic device 43 along the axial extension direction of the first shell 41 and the first shell 41 or the first end cover 42; an insulating adhesive layer 7 is also provided between an end face of the second piezoelectric ceramic element 53 in the axial direction of the second housing 51 and the second housing 51 or the second end cap 52. The insulating adhesive layer 7 is made of epoxy resin. The CFRP panel 2 and the steel beam 1 may be fixed by an insulating adhesive layer 7 made of epoxy resin.
In order to improve the reliability of signal transmission, the central axis of the first blind hole 44 is arranged to coincide with the central axis of the first housing 41; the central axis of the second blind hole 54 is coincident with the central axis of the second housing 51; the central axis of the first housing 41 and the central axis of the second housing 51 are located in the same vertical plane.
The signal receiving unit 6 includes a signal acquisition card 61 and a signal processing terminal 62, the signal acquisition card 61 is electrically connected to the second cable, and the signal acquisition card 61 is further electrically connected to the signal processing terminal 62. The signal acquisition card 61 can reliably acquire the response signal and convert the response signal into a signal level which can be identified by the signal processing terminal 62, the signal acquisition card 61 of the utility model can be realized by an NI acquisition card of American national instruments company, and the signal processing terminal 62 adopts a PC or a notebook computer which is configured with a USB interface, a serial interface or an Ethernet interface.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the utility model, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (8)
1. A monitoring system for the bonding strength of a steel beam and a carbon fiber plate comprises the steel beam (1) and a CFRP plate (2), wherein the CFRP plate (2) is fixedly arranged on the end face of the steel beam (1) and arranged along the extending direction of the steel beam (1); the method is characterized in that: the device also comprises a signal generating unit (3), a signal exciting assembly (4), a signal sensing assembly (5) and a signal receiving unit (6);
the steel beam (1) comprises a rib plate (11) and two supporting parts (12), the two supporting parts (12) are parallel and arranged at intervals, and the rib plate (11) is arranged between the two supporting parts (12) and is respectively and fixedly connected with the two supporting parts (12); the CFRP plate (2) is fixedly arranged on the end face, far away from the ribbed slab (11), of a supporting part (12);
the signal excitation assembly (4) is arranged on the end face, far away from the supporting part (12), of the CFRP plate (2), and the signal excitation assembly (4) is detachably connected with the CFRP plate (2) or the steel beam (1);
the signal generating unit (3) is arranged outside the steel beam (1), the signal generating unit (3) is electrically connected with the signal exciting assembly (4), and the signal generating unit (3) sends a detection exciting signal to the signal exciting assembly (4);
the signal induction component (5) is arranged on the end face of one side, close to the rib plate (11), of the supporting part (12) where the CFRP plate (2) is located, and the signal induction component (5) is detachably connected with the steel beam (1);
the signal receiving unit (6) is arranged outside the steel beam (1), the signal receiving unit (6) is electrically connected with the signal sensing assembly (5), and the signal sensing assembly (5) outputs a response signal to the signal receiving unit (6) after receiving the detection excitation signal sent by the signal excitation assembly (4).
2. The system for monitoring the bonding strength of the steel beam and the carbon fiber plate as claimed in claim 1, wherein: the signal excitation assembly (4) comprises a first shell (41), a first end cover (42) and a first piezoelectric ceramic device (43); one end of the first shell (41) is provided with a first blind hole (44), the first blind hole (44) is arranged along the axial extension direction of the first shell (41), and one end of the first blind hole (44) is communicated with the outside; the first piezoelectric ceramic device (43) is fixedly arranged in the first blind hole (44); the first end cover (42) is arranged at the end part of the first blind hole (44) and seals the first blind hole (44), and the first end cover (42) is respectively abutted against the first piezoelectric ceramic device (43) and the first shell (41); a through cable hole is formed in the first end cover (42), and the first piezoelectric ceramic device (43) is electrically connected with the signal generating unit (3) through a first cable penetrating through the cable hole; one end of the first shell (41) far away from the first blind hole (44) is detachably connected with the CFRP plate (2) or the steel beam (1).
3. The system for monitoring the bonding strength of the steel beam and the carbon fiber plate as claimed in claim 2, wherein: the signal sensing assembly (5) comprises a second shell (51), a second end cover (52) and a second piezoelectric ceramic device (53); one end of the second shell (51) is provided with a second blind hole (54), the second blind hole (54) is arranged along the axial extension direction of the second shell (51), and one end of the second blind hole (54) is communicated with the outside; the second piezoelectric ceramic device (53) is fixedly arranged in the second blind hole (54), the second end cover (52) is arranged at the end part of the second blind hole (54) and seals the second blind hole (54), and the second end cover (52) is respectively abutted against the second shell (51) and the second piezoelectric ceramic device (53); a through cable hole is also formed in the second end cover (52), and the second piezoelectric ceramic device (53) is electrically connected with the signal receiving unit (6) through a second cable penetrating through the cable hole; one end of the second shell (51) far away from the second blind hole (54) is detachably connected with the supporting part (12).
4. The system for monitoring the bonding strength of the steel beam and the carbon fiber plate as claimed in claim 3, wherein: the first shell (41) or the second shell (51) is made of a magnetic material, and the first shell (41) or the second shell (51) is magnetically connected with the supporting part (12).
5. The system for monitoring the bonding strength of the steel beam and the carbon fiber plate as claimed in claim 3, wherein: an insulating bonding layer (7) is further arranged between the end face of the first piezoelectric ceramic device (43) along the axial extension direction of the first shell (41) and the first shell (41) or the first end cover (42); an insulating adhesive layer (7) is also arranged between the end face of the second piezoelectric ceramic device (53) along the axial extension direction of the second shell (51) and the second shell (51) or the second end cover (52).
6. The system for monitoring the bonding strength of the steel beam and the carbon fiber plate as claimed in claim 3, wherein: the central axis of the first blind hole (44) is superposed with the central axis of the first shell (41); the central axis of the second blind hole (54) is superposed with the central axis of the second shell (51); the central axis of the first housing (41) and the central axis of the second housing (51) are located in the same vertical plane.
7. The system for monitoring the bonding strength of the steel beam and the carbon fiber plate as claimed in claim 6, wherein: the signal receiving unit (6) comprises a signal acquisition card (61) and a signal processing terminal (62), the signal acquisition card (61) is electrically connected with the second cable, and the signal acquisition card (61) is also electrically connected with the signal processing terminal (62).
8. The system for monitoring the bonding strength of the steel beam and the carbon fiber plate as claimed in claim 5, wherein: the insulating bonding layer (7) is made of epoxy resin.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202122216485.6U CN216051494U (en) | 2021-09-14 | 2021-09-14 | Monitoring system for bonding strength of steel beam and carbon fiber plate |
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| CN202122216485.6U CN216051494U (en) | 2021-09-14 | 2021-09-14 | Monitoring system for bonding strength of steel beam and carbon fiber plate |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114429771A (en) * | 2022-04-02 | 2022-05-03 | 武汉地震工程研究院有限公司 | Intelligent detection method and system for bonding defects of steel beam and CFRP (carbon fiber reinforced plastics) plate |
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2021
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114429771A (en) * | 2022-04-02 | 2022-05-03 | 武汉地震工程研究院有限公司 | Intelligent detection method and system for bonding defects of steel beam and CFRP (carbon fiber reinforced plastics) plate |
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