CN113834857B - Sensor for sliding interface of steel-concrete combined structure and signal acquisition system - Google Patents
Sensor for sliding interface of steel-concrete combined structure and signal acquisition system Download PDFInfo
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- CN113834857B CN113834857B CN202111046096.1A CN202111046096A CN113834857B CN 113834857 B CN113834857 B CN 113834857B CN 202111046096 A CN202111046096 A CN 202111046096A CN 113834857 B CN113834857 B CN 113834857B
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- 238000006243 chemical reaction Methods 0.000 claims description 16
- 239000002131 composite material Substances 0.000 claims description 5
- 125000006850 spacer group Chemical group 0.000 claims description 2
- 238000000034 method Methods 0.000 abstract description 5
- 238000010276 construction Methods 0.000 abstract description 4
- 238000009434 installation Methods 0.000 abstract description 4
- 230000008569 process Effects 0.000 abstract description 2
- 238000004519 manufacturing process Methods 0.000 abstract 1
- 238000005259 measurement Methods 0.000 abstract 1
- 229910000831 Steel Inorganic materials 0.000 description 19
- 239000010959 steel Substances 0.000 description 19
- 238000012360 testing method Methods 0.000 description 12
- 238000006073 displacement reaction Methods 0.000 description 8
- 238000012544 monitoring process Methods 0.000 description 4
- 238000013461 design Methods 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 230000009471 action Effects 0.000 description 2
- 238000004364 calculation method Methods 0.000 description 2
- 238000011282 treatment Methods 0.000 description 2
- 238000003466 welding Methods 0.000 description 2
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 230000003321 amplification Effects 0.000 description 1
- 230000004888 barrier function Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000003990 capacitor Substances 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005553 drilling Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000036541 health Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000003199 nucleic acid amplification method Methods 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000010008 shearing Methods 0.000 description 1
- 238000004088 simulation Methods 0.000 description 1
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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
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Abstract
The invention discloses a sensor for sliding of a steel-concrete combined structure interface and a signal acquisition system. The sensor comprises a shell and sliding blocks which are arranged in the shell and are in sliding contact with the shell through vertical plates, vertical baffle plates corresponding to two side surfaces of the vertical plates are arranged on the shell, fixed resistor groups formed by resistors arranged at two intervals are arranged on each vertical baffle plate, the surfaces of the resistors are flush with the surfaces of the vertical baffle plates, scissors supports formed by two crossed supporting feet are arranged on two side surfaces of the vertical plates, and sliding resistors which are in contact with the fixed resistor groups along the surfaces of the corresponding vertical baffle plates are arranged at the end parts of at least one supporting foot of each scissors support. The invention has the advantages of simple principle and accurate measurement, overcomes the severe environment of a construction site, has a waterproof function, is simple to process and manufacture, is convenient for site installation, and effectively solves the problem that the interface sliding of the steel-concrete combined structure is difficult to collect in real time.
Description
Technical Field
The invention belongs to the technical field of civil engineering, relates to a test acquisition module, and in particular relates to a sensor and a signal acquisition system for measuring interface slip of a steel-concrete combined structure by using a ammeter through displacement amplification effect.
Background
The steel-concrete combined structure is widely applied to bridges and building structures at present because of the advantages of light dead weight, high strength, assemblable construction and full utilization of the respective material properties of steel and concrete, the shear connector ensures the cooperative work of the steel and the concrete material, and an important index reflecting the working state and the mechanical property of the current structure is the relative slippage of the steel and the concrete interface.
At present, a great deal of tests and theoretical researches are carried out on the stress performance of the steel-concrete combined structure under the load action at home and abroad, but the relative slippage of the steel and concrete interface is mainly tested by an indirect or simplified method, such as push-out tests, finite element simulation calculation and the like, but no test on the relative slippage of the actual structure interface exists yet. The indirect or simplified method often has a difference with the stress performance of the actual structure, and the applicability of the method can not be completely verified at present by pushing out whether the result of the test or finite element calculation can be directly popularized to the actual structure; the simplified test does not directly reflect the interface slip under the load of the real structure, and mainly reflects the bolt bearing capacity under the shearing force, and the interface slip test is closely related to the interface treatment, and in the related tests carried out by different students and researchers, the interface slip amount is also greatly different due to the different treatments of the steel plate and concrete interfaces.
The monitoring of the relative slippage of the steel and concrete interface in the actual structure is limited by the fact that no sensor and no related test exists for the relative slippage test at present, if the relative slippage of the actual structure interface is collected in real time, the current stress state of the structure can be monitored more accurately for structural health monitoring work, structural displacement data can be updated in real time, and early warning is carried out on dangerous states in time.
Disclosure of Invention
The invention aims to provide a sensor for sliding of a steel-concrete combined structure interface and a signal acquisition system, so as to solve the problem that the relative sliding of an actual steel-concrete combined structure interface cannot be monitored in real time in the prior art.
The technical scheme adopted by the invention is as follows:
the invention provides a sensor for sliding of a steel-concrete combined structure interface, which comprises a shell and sliding blocks arranged in the shell and in sliding contact with the shell through vertical plates, wherein vertical baffle plates corresponding to two side surfaces of the vertical plates are arranged on the shell, fixed resistor groups formed by two resistors arranged at intervals are arranged on each vertical baffle plate, the surfaces of the resistors are flush with the surfaces of the vertical baffle plates, scissor supports formed by two hinged and crossed supporting feet are arranged on the two side surfaces of the vertical plates, and sliding resistors which are in sliding contact with the fixed resistor groups along the surfaces of the corresponding vertical baffle plates are arranged at the end parts of at least one supporting foot of each scissor support.
The shell is supported on the vertical plate of the sliding block through a cushion block.
The fixed resistors on each vertical baffle are two groups, the sliding resistors are arranged on two supporting feet of each scissor brace, and the sliding resistors are respectively in sliding contact with one group of fixed resistors.
A reset spring is arranged between the two supporting feet of the scissor support, one end of one supporting foot is hinged with the vertical plate through a hinge, the free end of the other supporting foot is propped against the vertical plate, and the two supporting feet are respectively hinged with the sliding resistor through a hinge.
The shell and the lower sliding block are in sliding fit through mutually embedded grooves, and gel is filled in the grooves.
The sliding block is provided with a positioning bolt hole; and an opening is formed in the shell, and a shielding wire connected with the fixed resistor on the vertical baffle is led out through the opening.
The signal acquisition system for interface sliding of the steel-concrete combined structure by adopting the sensor comprises a current signal input part, an I/V conversion part, an A/D conversion part, a micro control unit part and a storage and display part which are electrically connected in sequence; when the interface of the steel-concrete combined structure slides, the current signal of the sensor is input into the current signal input part, the current signal is converted into a voltage signal through the I/V conversion part, the voltage signal is converted and sampled through the A/D conversion part and then is output to the micro control unit part and the storage and display part for data reading and storage, and the numerical value of the data collected by each sensor is displayed in real time through the LCD display.
The beneficial effects of the invention are as follows:
1. According to the invention, the installation factors are fully considered in the design, the sliding block and the steel beam top plate can be connected by welding or bolting, and the sensor main body is buried in concrete, so that the sensor is prevented from being damaged due to relative sliding of the concrete and the steel beam.
2. The sliding block is directly coupled with the shell through the groove, gel is filled in the groove, the circuit element is prevented from being damaged due to the fact that moisture enters the sensor main body in the concrete pouring process, and meanwhile the gel cannot limit the sliding block to freely slide.
3. Because the relative sliding quantity of the concrete and the steel is smaller in magnitude under the action of smaller load, the relative sliding quantity of the concrete and the steel is amplified by adopting the scissor brace so as to more accurately test the relative sliding quantity.
4. The sensor main body is internally provided with two scissors supports, and the relative sliding quantity and the relative sliding direction can be output through respectively identifying the electric signals of the two scissors supports when the two scissors supports slide in different sliding quantities.
5. The two scissors supports comprise four supporting feet, the sensors can be calibrated in advance when not embedded, in actual collection, the accuracy is reduced due to factors such as deformation of the sensors, and the like, and errors can be reduced through mean value processing of signals of the four supporting feet by the signal acquisition system.
6. The electric signal is input into the signal acquisition system by the shielding wire, so that the relative slippage of the interface can be read and stored in real time, and the real-time monitoring of the structure is realized.
In order to describe the present invention more specifically, the following detailed description of the technical scheme of the present invention is given with reference to the accompanying drawings and the specific embodiments.
Drawings
FIG. 1 is a schematic view of the installation of the sensor of the present invention in a steel-hybrid composite structure.
Fig. 2 is a cross-sectional view of the sensor.
Fig. 3 is a cross-sectional view taken along A-A of fig. 2.
Fig. 4 is a block diagram of a signal acquisition system of the present invention.
Detailed Description
As shown in fig. 1-3, the sensor 3 for sliding of the interface of the steel-concrete combined structure provided by the invention comprises a housing 301 and a sliding block 302 arranged in the housing 301 and in sliding contact with the housing 301 through a vertical plate 304, wherein vertical baffle plates 307 corresponding to two side surfaces of the vertical plate 304 are arranged on the housing 301, fixed resistor groups formed by two resistors 308 and 309 arranged at intervals are arranged on each vertical baffle plate 307, the surfaces of the resistors 308 and 309 are flush with the surfaces of the vertical baffle plates 307, a scissor support 305 formed by two supporting feet 3051 and 3052 which are hinged and crossed is arranged on two side surfaces of the vertical plate 304, and a sliding resistor 306 which is in sliding contact with the fixed resistor groups along the surface of the corresponding vertical baffle plate 307 is arranged at the end part of at least one supporting foot of each scissor support 305; the horizontal dimension of the outer shell 301 is not more than 50cm at maximum and not more than 3cm at minimum, in this embodiment, the outer shell 301 is square, and the lengths of four sides of the outer shell 301 are horizontal dimensions; other geometries for the housing may be employed, such as rectangular, polygonal, circular, etc.
The housing 301 is supported above the vertical plate 304 of the slider 302 by a spacer 310.
The fixed resistor groups on each vertical baffle 307 are two groups arranged up and down, the sliding resistor 306 is arranged on two supporting feet 3051 and 3052 of each scissor brace, and the two supporting feet are respectively in sliding contact with one group of fixed resistors; the two supporting feet 3051 and 3052 of the scissors 305 are hinged through a hinge 315, a return spring 316 is arranged between the two supporting feet 3051 and 3052 of the scissors 305, one end of one supporting foot 3052 is hinged with the vertical plate 304 through a hinge 317, the free end 313 of the other supporting foot 3051 is abutted against the vertical plate 304, the two supporting feet 3051 and 3052 are respectively hinged with the sliding resistor 306 through a hinge 314, and the structure of the scissors 305 can ensure the mobility of the scissors.
The shell 301 and the lower sliding block 302 are in sliding fit through mutually embedded grooves 318, and the grooves 318 are filled with gel to realize a waterproof function.
The sliding block 302 is provided with a positioning bolt hole 303; the housing 301 is provided with an opening 312, and the shielding wire 311 connected to the fixed resistor 308 on the vertical barrier 307 is led out through the opening 312.
The material used for the scissors 305 should have enough rigidity to avoid the relationship between the current and the displacement of the sliding resistor 306 from linear to nonlinear caused by excessive deformation.
The return spring 316 should have sufficient self-resetting capability and its creep relaxation characteristics should be controlled within an error tolerance.
To the acquisition system shown in fig. 4.
Measuring point layout:
referring to fig. 1, when the structural design allows drilling the upper flange plate of the steel beam, the upper flange plate of the steel beam 2 can be drilled according to the specific positions of the positioning bolt holes 303 of the sliding blocks 302 in the sensor 3, and the sliding blocks 302 for connecting the steel beam 2 and the sensor 3 through bolts are adopted; when the structural design does not allow the steel beam to be perforated, the sliding block 302 and the steel beam 2 can be directly connected by adopting a welding mode.
Assembly of the sensor:
as shown in fig. 2 and 3, the sliding block 302, the vertical plate 304 and the positioning bolt hole 303 of the sensor 3 are directly and integrally processed by a factory through die sinking, the cushion block 310 is fixed with the vertical plate 304 through a strong adhesive, one end of the scissor 305 is hinged with the middle part of the vertical plate 304, and the other end of the scissor 305 is hinged with the sliding resistor 306. The two legs of the scissors support 305 are self-reset by a reset spring 316, the outer shell 301 is connected with the lower sliding block 302 by a groove 318 shown in fig. 3, and gel is filled in the groove 318.
The signal acquisition system 4 for interface sliding of the steel-concrete composite structure provided by the invention is shown in fig. 1,2 and 4, and comprises a current signal input part 401, an I/V conversion part 402, an A/D conversion part 403, an MCU (micro control unit) part 404 and a storage and display part 405 which are electrically connected in sequence. The shielding wire 311 led out from the opening 312 of the sensor housing 301 is connected to the current signal input part 401 of the signal acquisition system 4, the current signal is converted into a voltage signal by the I/V conversion part 402, the voltage signal is converted and sampled by the a/D conversion part 403, and then the voltage signal is output to the MCU part 404 and the storage and display part 405 for data reading and storage, and the numerical value of the data acquired by each sensor 3 is displayed in real time by the LCD display. The I/V conversion part 402 is formed by using an active device operational amplifier and a resistor-capacitor, the a/D conversion part 403 is implemented by using an ADC0809 chip, and the MCU part 404 is implemented by using a high-performance 8-bit microcontroller AT89S51 which is proposed by ATMEL company.
The sensor signal acquisition principle of the invention is as follows:
Referring to fig. 1, the sliding block 302 of the sensor 3 is fixed with the flange plate on the steel beam 2, the housing 301 is embedded in the concrete 1, and the shielding wire 311 is connected to the signal acquisition system 4 through the housing opening 312. When the interface between the concrete 1 and the steel beam 2 slides relatively, the sliding block 302 slides relatively to the outer shell 301, the opening angle of the scissor support 305 changes accordingly, the contact area between the sliding resistor 306 and the fixed resistors 308 and 309 changes, so that the current in the shielding wire 311 changes, and displacement increment data corresponding to the current increment is displayed and stored by the signal acquisition system 4.
Before the sensor 3 is installed, the relation between the current increment and the displacement increment is calibrated through a test, and the relation is written into the MCU part 404 through a program, so that the displacement of the relative sliding of the interface, namely the mutual conversion of electric signals, is realized.
The sensor and signal acquisition module is installed and used the flow as follows:
Firstly, before concrete pouring is performed after the steel beam of the steel-concrete combined structure is installed, a sliding block 302 of a sensor 3 is bolted or welded on an upper flange plate of a steel beam 2; then, the shielding wire 311 is connected to the signal acquisition system 4, and the shielding wire 311 can be embedded in the concrete 1 or directly led out according to the actual condition of site construction; finally, concrete is poured, and the installation of the sensor 3 and the signal acquisition system 4 is completed.
The sensor realizes the mutual conversion of interface relative sliding displacement and electric signals, amplifies the interface relative sliding displacement through the scissors support, improves the measuring precision of the sensor, can reflect the relative sliding direction of the interface due to the two scissors supports, has a waterproof function, can be suitable for complex construction environments, and provides real-time data acquisition and storage functions for the relevant monitoring work of the steel-concrete combined structure.
The examples described above represent only embodiments of the invention and are not to be understood as limiting the scope of the patent of the invention, it being pointed out that several variants and modifications can be made by a person skilled in the art without departing from the concept of the invention, which fall within the scope of protection of the invention.
Claims (4)
1. The sensor for sliding of the interface of the steel-concrete combined structure is characterized by comprising a shell and sliding blocks which are arranged in the shell and are in sliding contact with the shell through vertical plates, wherein vertical baffles corresponding to two sides of the vertical plates are arranged on the shell, fixed resistor groups consisting of two resistors arranged at intervals are arranged on each vertical baffle, the surfaces of the resistors are level with the surfaces of the vertical baffles, scissors supports consisting of two hinged and crossed supporting feet are arranged on the two sides of the vertical plates, and sliding resistors which are in sliding contact with the fixed resistor groups along the surfaces of the corresponding vertical baffles are arranged at the end parts of at least one supporting foot of each scissors support; the fixed resistors on each vertical baffle are two groups, the sliding resistors are arranged on two supporting feet of each scissor brace, and the sliding resistors are respectively in sliding contact with one group of fixed resistors; a reset spring is arranged between two supporting feet of the scissor support, one end of one supporting foot is hinged with the vertical plate through a hinge, the free end of the other supporting foot is propped against the vertical plate, and the two supporting feet are respectively hinged with the sliding resistor through a hinge; the shell and the lower sliding block are in sliding fit through mutually embedded grooves, and gel is filled in the grooves.
2. The sensor for steel-concrete composite structure interface slip of claim 1, wherein the housing is supported above the vertical plate of the slider by a spacer.
3. The sensor for steel-concrete composite structure interface slip of claim 1, wherein the sliding block is provided with a positioning bolt hole; and an opening is formed in the shell, and a shielding wire connected with the fixed resistor on the vertical baffle is led out through the opening.
4. A signal acquisition system for interface slip of a steel-hybrid composite structure using the sensor of claim 1, comprising a current signal input part, an I/V conversion part, an a/D conversion part, a micro control unit part and a storage and display part electrically connected in sequence; when the interface of the steel-concrete combined structure slides, the current signal of the sensor is input into the current signal input part, the current signal is converted into a voltage signal through the I/V conversion part, the voltage signal is converted and sampled through the A/D conversion part and then is output to the micro control unit part and the storage and display part for data reading and storage, and the numerical value of the data collected by each sensor is displayed in real time through the LCD display.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111046096.1A CN113834857B (en) | 2021-09-07 | 2021-09-07 | Sensor for sliding interface of steel-concrete combined structure and signal acquisition system |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202111046096.1A CN113834857B (en) | 2021-09-07 | 2021-09-07 | Sensor for sliding interface of steel-concrete combined structure and signal acquisition system |
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| Publication Number | Publication Date |
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| CN113834857A CN113834857A (en) | 2021-12-24 |
| CN113834857B true CN113834857B (en) | 2024-05-07 |
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Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20080093697A (en) * | 2007-04-18 | 2008-10-22 | 한국건설기술연구원 | Method and apparatus of interface shear |
| CN101424879A (en) * | 2008-12-12 | 2009-05-06 | 厦门大学 | Resistance straining reaction type closed-loop two-dimension flexible hinge work bench |
| CN106482623A (en) * | 2016-10-21 | 2017-03-08 | 安徽沃巴弗电子科技有限公司 | A kind of slider type linear displacement transducer |
| CN207215011U (en) * | 2017-09-01 | 2018-04-10 | 西安建筑科技大学 | It is a kind of to measure the sensor that interfacial adhesion slides between steel plate and concrete |
| CN110208182A (en) * | 2019-06-20 | 2019-09-06 | 大连理工大学 | It is a kind of for measuring the measurement sensor and measurement method of bond-slip at fashioned iron and concrete interface |
| CN212179796U (en) * | 2020-07-07 | 2020-12-18 | 无锡三虹重工机械设备有限公司 | Displacement change detection device for industrial equipment |
| CN112147070A (en) * | 2020-10-22 | 2020-12-29 | 长安大学 | Device and method for measuring relative slippage of steel-concrete interface |
| CN212931740U (en) * | 2020-11-02 | 2021-04-09 | 天津昂嘉科技发展有限公司 | High-stability pressure-resistant pressure sensor for CMP (chemical mechanical polishing) equipment |
-
2021
- 2021-09-07 CN CN202111046096.1A patent/CN113834857B/en active Active
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20080093697A (en) * | 2007-04-18 | 2008-10-22 | 한국건설기술연구원 | Method and apparatus of interface shear |
| CN101424879A (en) * | 2008-12-12 | 2009-05-06 | 厦门大学 | Resistance straining reaction type closed-loop two-dimension flexible hinge work bench |
| CN106482623A (en) * | 2016-10-21 | 2017-03-08 | 安徽沃巴弗电子科技有限公司 | A kind of slider type linear displacement transducer |
| CN207215011U (en) * | 2017-09-01 | 2018-04-10 | 西安建筑科技大学 | It is a kind of to measure the sensor that interfacial adhesion slides between steel plate and concrete |
| CN110208182A (en) * | 2019-06-20 | 2019-09-06 | 大连理工大学 | It is a kind of for measuring the measurement sensor and measurement method of bond-slip at fashioned iron and concrete interface |
| CN212179796U (en) * | 2020-07-07 | 2020-12-18 | 无锡三虹重工机械设备有限公司 | Displacement change detection device for industrial equipment |
| CN112147070A (en) * | 2020-10-22 | 2020-12-29 | 长安大学 | Device and method for measuring relative slippage of steel-concrete interface |
| CN212931740U (en) * | 2020-11-02 | 2021-04-09 | 天津昂嘉科技发展有限公司 | High-stability pressure-resistant pressure sensor for CMP (chemical mechanical polishing) equipment |
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