CN112033587B - In-service large-span structure rod piece axial force testing member - Google Patents
In-service large-span structure rod piece axial force testing member Download PDFInfo
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- CN112033587B CN112033587B CN202010971847.XA CN202010971847A CN112033587B CN 112033587 B CN112033587 B CN 112033587B CN 202010971847 A CN202010971847 A CN 202010971847A CN 112033587 B CN112033587 B CN 112033587B
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- 238000012360 testing method Methods 0.000 title claims abstract description 25
- 239000000835 fiber Substances 0.000 claims abstract description 103
- 238000003466 welding Methods 0.000 claims abstract description 16
- 238000012546 transfer Methods 0.000 claims abstract description 5
- 239000000919 ceramic Substances 0.000 claims description 23
- 230000000712 assembly Effects 0.000 claims description 6
- 238000000429 assembly Methods 0.000 claims description 6
- 238000009434 installation Methods 0.000 abstract description 6
- 230000007613 environmental effect Effects 0.000 abstract description 3
- 238000004519 manufacturing process Methods 0.000 abstract description 3
- 238000012545 processing Methods 0.000 abstract description 3
- 238000012544 monitoring process Methods 0.000 description 7
- 230000000694 effects Effects 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 230000035945 sensitivity Effects 0.000 description 3
- 238000005452 bending Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000010276 construction Methods 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 239000013307 optical fiber Substances 0.000 description 2
- 206010034972 Photosensitivity reaction Diseases 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 235000005770 birds nest Nutrition 0.000 description 1
- 239000003822 epoxy resin Substances 0.000 description 1
- 239000002657 fibrous material Substances 0.000 description 1
- 239000003292 glue Substances 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000036211 photosensitivity Effects 0.000 description 1
- 229920000647 polyepoxide Polymers 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
- 235000005765 wild carrot Nutrition 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L1/00—Measuring force or stress, in general
- G01L1/24—Measuring force or stress, in general by measuring variations of optical properties of material when it is stressed, e.g. by photoelastic stress analysis using infrared, visible light, ultraviolet
- G01L1/242—Measuring force or stress, in general by measuring variations of optical properties of material when it is stressed, e.g. by photoelastic stress analysis using infrared, visible light, ultraviolet the material being an optical fibre
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B11/00—Measuring arrangements characterised by the use of optical techniques
- G01B11/16—Measuring arrangements characterised by the use of optical techniques for measuring the deformation in a solid, e.g. optical strain gauge
- G01B11/165—Measuring arrangements characterised by the use of optical techniques for measuring the deformation in a solid, e.g. optical strain gauge by means of a grating deformed by the object
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B7/00—Measuring arrangements characterised by the use of electric or magnetic techniques
- G01B7/16—Measuring arrangements characterised by the use of electric or magnetic techniques for measuring the deformation in a solid, e.g. by resistance strain gauge
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L1/00—Measuring force or stress, in general
- G01L1/16—Measuring force or stress, in general using properties of piezoelectric devices
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)
Abstract
An in-service large-span structure rod piece axial force testing component comprises a supporting seat, a supporting beam, a cantilever beam, a fiber bragg grating and a transfer block; the supporting seat is fixedly connected with the inner surface of the rod piece to be measured in a welding mode, one end of the supporting beam is fixedly connected with the supporting seat in an inserting mode, the supporting beam is parallel to the rod piece to be measured, one end of the cantilever beam is fixedly connected with the other end of the supporting beam in a welding mode, the cantilever beam is perpendicular to the supporting beam, one end of the switching block is fixedly connected with the other end of the cantilever beam in a threaded mode, the inner surface of the rod piece to be measured is fixedly connected with the other end of the switching block in a welding mode, the fiber bragg grating is fixedly installed on the upper surface of the cantilever beam, and the fiber bragg grating is parallel to the cantilever beam. The invention is arranged in the rod piece to form an integral structure with the rod body, can be installed in the processing and production stage of the rod piece, avoids the installation mode of high-altitude operation, avoids the influence of external environmental factors such as severe weather and the like on a shaft force testing component, improves the working stability and prolongs the service life of the invention. The invention is also provided with a piezoelectric sensing device which can monitor the strain of the large-span structure rod piece under the dynamic load.
Description
Technical Field
The invention belongs to the technical field of building structure health monitoring, and particularly relates to an in-service long-span structure rod piece axial force testing member.
Background
In recent years, large span structures have been developed rapidly and should be widely used in landmark buildings such as bird nests, water cubes, and the like. However, the large-span structure has factors such as complex construction engineering and long life cycle, so the method is very important for health monitoring of the large-span structure.
For the building engineering adopting the large-span structure, long-term tracking monitoring is carried out from the construction stage, and in the service stage, the large-span structure is in a working state for a long time, so that important components of the large-span structure are easy to damage and other special conditions. Therefore, in order to effectively monitor the health of the whole large span structure, the most basic monitoring is the axial force monitoring of the large span structure rod.
At present, the most common monitoring means in a large span structure is to mount a force sensor on the surface of a rod, specifically, the strain on the surface of the rod is measured, and then the strain is converted into the stress and the axial force of the rod, and the common strain sensors include a resistance strain gauge, a vibrating wire strain gauge and a fiber grating sensor. However, the various sensors for monitoring the axial force of the rod piece are installed on the surface of the rod piece after the rod piece is lapped and combined, the large-span structure is large in scale and high in height, the various sensors are installed inevitably through a large amount of high-altitude operation, the operation difficulty is high, the labor intensity is high, and the sensors are directly installed on the surface of the rod piece, so that external environmental factors such as severe weather can have adverse effects on the working stability and the service life of the sensors.
Disclosure of Invention
Aiming at the problems in the prior art, the invention provides an in-service long-span structure rod piece axial force testing member which is arranged in a rod piece and forms an integral structure with the rod piece, so that the installation can be completed in the rod piece processing and production stage, and the installation mode of high-altitude operation is effectively avoided.
In order to achieve the purpose, the invention adopts the following technical scheme: an in-service large-span structure rod piece axial force testing component comprises a supporting seat, a supporting beam, a cantilever beam, a fiber bragg grating and a transfer block; the support seat is fixedly connected with the inner surface of the rod piece to be detected in a welding mode, one end of the supporting beam is fixedly inserted on the support seat, the supporting beam is parallel to the rod piece to be detected, one end of the cantilever beam is fixedly connected with the other end of the supporting beam in a welding mode, the cantilever beam is perpendicular to the supporting beam, one end of the switching block is fixedly connected with the other end of the cantilever beam in a threaded mode, and the other end of the switching block is fixedly connected with the inner surface of the rod piece to be detected in a welding mode; the fiber grating is fixedly arranged on the upper surface of the cantilever beam and is parallel to the cantilever beam.
The middle part of the supporting beam is provided with a piezoelectric sensing alarm device, and a mounting hole for mounting the piezoelectric sensing device is formed in the beam body of the supporting beam; the piezoelectric sensing device comprises piezoelectric ceramics, a non-piezoelectric elastic layer and a charge amplifier; the piezoelectric ceramics are positioned in the mounting holes, and non-piezoelectric elastic layers are arranged between the upper surface and the lower surface of the piezoelectric ceramics and the wall of the mounting hole; the charge amplifier is arranged on the outer surface of the support beam, and the electric signal access end of the charge amplifier is electrically connected with the electric signal output end of the piezoelectric ceramic.
The number of the cantilever beams is three, and the three cantilever beams are uniformly distributed along the circumference of the support beam; the cantilever beam is the uniform strength cantilever beam, and the upper and lower surface of cantilever beam all is isosceles trapezoid, and cantilever beam thickness everywhere equals.
The fiber grating is fixed on the cantilever beam by a fiber grating clamping component, and the fiber grating clamping component comprises a fiber grating clamping rod, a nut for clamping the fiber grating, a bolt for clamping the fiber grating and a flat washer for clamping the fiber grating; the number of the fiber grating clamping assemblies is two, and the two fiber grating clamping assemblies are respectively positioned at two ends of the fiber grating; the fiber grating clamping rod is of a U-shaped structure, the fiber grating penetrates through the middle of the fiber grating clamping rod, two support arms of the fiber grating clamping rod are long and short, the long support arm is fixedly connected with the upper surface of the cantilever beam in a welding mode, a bolt hole is formed between the long support arm and the short support arm, a bolt for clamping the fiber grating penetrates through the bolt holes of the long support arm and the short support arm, and a nut for clamping the fiber grating is screwed at the end part of the bolt for clamping the fiber grating; and flat washers for clamping the fiber bragg gratings are arranged between the screw cap of the bolt for clamping the fiber bragg gratings and the nut for clamping the fiber bragg gratings and the fiber bragg gratings.
The invention has the beneficial effects that:
the in-service large-span structure rod piece axial force testing component is arranged in the rod piece and forms an integral structure with the rod piece, so that the component can be installed in the processing and production stage of the rod piece, the installation mode of high-altitude operation is effectively avoided, the axial force testing component is positioned in the rod piece, external environmental factors such as severe weather and the like are difficult to influence the axial force testing component, the working stability and the service life of the axial force testing component are improved, and meanwhile, the piezoelectric sensing device is additionally arranged in the axial force testing component, so that the strain of the large-span structure rod piece under dynamic load can be effectively monitored.
Drawings
FIG. 1 is a perspective view of an in-service long-span structural rod axial force testing member according to the present invention;
FIG. 2 is a perspective view (partially exploded) of an in-service long span structural rod axial force testing member according to the present invention;
FIG. 3 is a front view of an in-service long-span structural rod axial force testing member according to the present invention;
FIG. 4 is a top view of an in-service long span structural rod axial force testing member according to the present invention;
FIG. 5 is a side view of the fiber grating clamping assembly of the present invention;
FIG. 6 is a top view of the fiber grating clamping assembly of the present invention;
in the figure, 1-supporting seat, 2-supporting beam, 3-cantilever beam, 4-fiber grating, 5-switching block, 6-rod piece to be tested, 7-piezoelectric ceramic, 8-non-piezoelectric elastic layer, 9-charge amplifier, 10-fiber grating clamping rod, 11-nut for clamping fiber grating, 12-bolt for clamping fiber grating, and 13-flat washer for clamping fiber grating.
Detailed Description
The invention is described in further detail below with reference to the figures and the specific embodiments.
As shown in fig. 1 to 6, an in-service long-span structural rod axial force testing member comprises a support base 1, a support beam 2, a cantilever beam 3, a fiber grating 4 and a switching block 5; the supporting seat 1 is fixedly connected with the inner surface of a rod piece 6 to be measured in a welding mode, one end of the supporting beam 2 is fixedly inserted on the supporting seat 1, the supporting beam 2 is parallel to the rod piece 6 to be measured, one end of the cantilever beam 3 is fixedly connected with the other end of the supporting beam 2 in a welding mode, the cantilever beam 3 is perpendicular to the supporting beam 2, one end of the transfer block 5 is fixedly connected with the other end of the cantilever beam 3 in a threaded mode, and the other end of the transfer block 5 is fixedly connected with the inner surface of the rod piece 6 to be measured in a welding mode; the fiber grating 4 is fixedly arranged on the upper surface of the cantilever beam 3, and the fiber grating 4 is parallel to the cantilever beam 3.
Before the supporting seat 1 and the inner surface of the rod piece 6 to be measured are welded and fixed, the supporting seat 1 and the inner surface of the rod piece 6 to be measured can be bonded together by utilizing the fixing glue, and then the supporting seat 1 and the rod piece 6 to be measured are welded together, so that the firmness of connection between the supporting seat 1 and the rod piece 6 to be measured is ensured. The fiber grating 4 utilizes the photosensitivity of the fiber material to form a spatial phase grating in the fiber core, and when the fiber grating 4 is subjected to axial strain or temperature change, the resonant wave of the fiber grating is changed. Offer on supporting seat 1 be the spliced eye form, and what adopt on a supporting beam 2 is the grafting round pin form, this kind of grafting form is convenient for more the installation of axial force test component, and the installation order is for fixing cantilever beam 3 to 6 internal surfaces of member that awaits measuring earlier, is in the same place supporting seat 1 and a supporting beam 2 link together through the grafting form, links firmly supporting seat 1 and 6 internal surfaces of member that awaits measuring together at last. The design is convenient for connecting the supporting seat 1 with the supporting beam 2 in different shapes and sizes according to specific conditions, thereby saving materials, being convenient and efficient.
The middle part of the supporting beam 2 is provided with a piezoelectric sensing alarm device, and a mounting hole for mounting the piezoelectric sensing device is formed in the beam body of the supporting beam 2; the piezoelectric sensing device comprises piezoelectric ceramics 7, a non-piezoelectric elastic layer 8 and a charge amplifier 9; the piezoelectric ceramics 7 are positioned in the mounting holes, and non-piezoelectric elastic layers 8 are arranged between the upper surface and the lower surface of the piezoelectric ceramics 7 and the wall of each mounting hole; the charge amplifier 9 is arranged on the outer surface of the support beam 2, and the electric signal input end of the charge amplifier 9 is electrically connected with the electric signal output end of the piezoelectric ceramic 7.
Due to the existence of the non-piezoelectric elastic layer 8, the piezoelectric ceramic 7 can be tightly fixed in the mounting hole, so that the deformation of the whole structure is coordinated, meanwhile, in order to avoid short circuit, the non-piezoelectric elastic layer 8 has good insulating property, so that the epoxy resin can be used as the main material of the non-piezoelectric elastic layer 8, the electrical stability of the piezoelectric ceramic 7 can be ensured, the piezoelectric ceramic 7 can be better embedded, and the stress transmission is facilitated. When the supporting beam 2 is subjected to axial deformation when the rod piece 6 to be measured is loaded, pressure is generated inside the supporting beam 2 due to deformation cooperation, and the pressure value is measured through the piezoelectric ceramics 7 so as to obtain the strain and stress of the rod piece 6 to be measured. The piezoelectric ceramic 7 can generate positive pressure point effect under the action of pressure, and can convert mechanical energy into electric energy, and the magnitude of the pressure can be obtained by measuring the strength of an electric signal. The piezoelectric ceramic 7 has high impedance, so that the change value of the electric signal can be well obtained under dynamic load, and the piezoelectric ceramic is not suitable for measuring mechanical parameters under a static loading condition. Most of the large-span structures are generally greatly influenced by dynamic loads, the change of the dynamic loads often causes the damage and the damage of the whole structure, and the piezoelectric ceramics 7 is suitable for measuring dynamic mechanical parameters. Therefore, by utilizing the characteristic, the piezoelectric sensing alarm device can be manufactured, the safety range of voltage output is limited, and when the output voltage exceeds the safety range, the potential safety hazard of the structure is indicated, and corresponding treatment is required to be carried out in time. In addition, the piezoelectric ceramic 7 amplifies the output electric signal through the charge amplifier 9 with a power supply, which is of great importance because the electric energy generated by the piezoelectric effect is very limited and is not beneficial to measurement, and when the stress of the rod piece 6 to be measured needs to be continuously monitored during dynamic load, the voltage change condition of the piezoelectric ceramic 7 can be continuously monitored through the data acquisition instrument.
The number of the cantilever beams 3 is three, and the three cantilever beams 3 are uniformly distributed along the circumference of the support beam 2; the cantilever beam 3 is the uniform strength cantilever beam, and the upper and lower surface of cantilever beam 3 all is isosceles trapezoid, and 3 thickness everywhere of cantilever beam equals.
When the rod piece 6 to be tested is stressed, the fiber bragg grating 4 can sense the axial stress condition of points on the rod piece 6 to be tested connected with each cantilever beam 3, the axial force identification of three points on the rod piece 6 to be tested connected with the cantilever beams 3 can basically judge the stress condition of the cross section of the whole rod piece 6 to be tested, and the eccentric stress condition and other conditions can be found in time. Because the cantilever beam 3 is an equal-strength cantilever beam, the fixing position of the fiber grating clamping rods 10 is not particularly limited, and the sensitivity of the fiber grating 4 can be ensured to be unchanged as long as the distance between the two fiber grating clamping rods 10 is ensured to be consistent. The cantilever beam 3 can be made of stainless steel materials, the strain can be fully transmitted to the cantilever beam 3 through the adapter block 5, and compared with the inner surface of the rod piece 6 to be tested, the cantilever beam 3 can be directly welded, and the residual stress generated on the welded cantilever beam 3 can be avoided.
The fiber grating 4 is fixed on the cantilever beam 3 by a fiber grating clamping component, and the fiber grating clamping component comprises a fiber grating clamping rod 10, a nut 11 for clamping the fiber grating, a bolt 12 for clamping the fiber grating and a flat washer 13 for clamping the fiber grating; the number of the fiber grating clamping assemblies is two, and the two fiber grating clamping assemblies are respectively positioned at two ends of the fiber grating 4; the fiber grating clamping rod 10 is of a U-shaped structure, the fiber grating 4 penetrates through the middle of the fiber grating clamping rod 10, two support arms of the fiber grating clamping rod 10 are long and short, the long support arm is fixedly connected with the upper surface of the cantilever beam 3 in a welding mode, a bolt hole is formed between the long support arm and the short support arm, the fiber grating clamping bolt 12 penetrates through the bolt holes of the long support arm and the short support arm, and the fiber grating clamping nut 11 is in threaded connection with the end portion of a screw of the fiber grating clamping bolt 12; and flat washers 13 for clamping the fiber bragg gratings are arranged between the nuts of the bolts 12 for clamping the fiber bragg gratings and the nuts 11 for clamping the fiber bragg gratings and the fiber bragg gratings 10.
The welding point position of the upper surface of the long-arm cantilever beam 3 of the fiber grating clamping rod 10 is located on the central axis of the cantilever beam 3, and nut loosening liquid can be filled on the screw rod of the bolt 12 for clamping the fiber grating, so that the clamping stability of the fiber grating 4 can be better ensured. When the rod piece 6 to be measured generates axial strain under the action of external load, the strain is directly transmitted to the cantilever beam 3, and when the cantilever beam 3 deforms, the fiber grating 4 fixed on the fiber grating clamping assembly also synchronously deforms, and the strain quantity of the cantilever beam 3 can be measured through the fiber grating 4, so that the internal force of the rod piece 6 to be measured can be calculated.
Taking the rod member 6 to be measured made of Q235 steel as an example, the diameter of the rod member 6 to be measured is phi 245mm, the wall thickness of the rod member 6 to be measured is 4mm, the length of the rod member 6 to be measured is 3m, and the design value of the tensile force of the rod member 6 to be measured is 2605 KN.
The length of the cantilever beam 3 is set as L, the height of the cross section of the cantilever beam 3 is set as h, the width of the cantilever beam 3 changes in a linear relation along the axial direction, and the deflection of the cantilever beam 3 is w.
Under the action of the axial force, the rod piece 6 to be tested axially deforms, the axial deformation of the rod piece 6 to be tested is directly transmitted to the cantilever beam 3, the upper surface of the cantilever beam 3 generates a bending positive strain epsilon, and the epsilon is wh/L2。
The length of the measuring area of the axial force testing component is l, when the rod piece 6 to be tested is acted by the axial force, the axial deformation of the rod piece 6 to be tested is uniform, and the axial average positive strain of the rod piece 6 to be tested is epsilon1If epsilon is equal to epsilon1·lh/L2。
It can be found that when the length L of the cantilever beam 3, the section height h of the cantilever beam 3 and the length L of the measuring area of the axial force testing component are reasonably selected, compared with the force measuring sensor in the traditional structure form, the axial force testing component effectively improves the measuring precision and sensitivity.
It can be seen that the inner diameter of the rod 6 to be measured is phi 237mm, so the selected adapting block 5 should protrude the cantilever beam 3 by about 10mm, so the length of the cantilever beam 3 can be set to 50mm, the section radius of the supporting beam 2 is set to 60mm, and in order to make the axial force testing member have higher sensitivity, the cantilever beam 3 with a higher section height h and a longer length l of the measuring area should be selected, so the section height h of the cantilever beam 3 is designed to be 15mm, and the length l of the measuring area is designed to be 200 mm.
When the initial wavelength of the fiber grating 4 is λ, the relationship between the wavelength shift Δ λ and the positive bending strain ∈ generated on the upper surface of the cantilever 3 and the ambient temperature change Δ T is Δ λ/λ (1-P) ═ Pe)ε+(αf+ ζ) Δ T, wherein PeIs the elasto-optic coefficient, alpha, of the optical fiberfZeta is the thermo-optic coefficient of the optical fiber, and P is the temperaturee≈0.22。
Therefore, the axial positive strain epsilon of the upper surface of the cantilever beam 3 can be obtained by measuring the initial wavelength and the wavelength offset of the fiber bragg grating 4 after the rod piece 6 to be measured is stressed, and finally the positive strain epsilon is equal to epsilon1·lh/L2The axial strain and the axial force of the rod 6 to be measured can be obtained.
In addition, the same fiber grating can be arranged on the lower surface of the cantilever beam 3, and because the two fiber gratings are in the same environment, the fiber gratings distributed on the surface of the cantilever beam 3 have the same wavelength drift amount caused by the influence of temperature, and therefore the wavelength drift amounts of any two fiber gratings 4 are subtracted from each other, so that the temperature compensation can be realized. The center wavelength of the fiber grating on the lower surface of the cantilever beam 3 is set as lambda1The wavelength drift amount is set to Δ λ1Then, Δ λ/λ - Δ λ1/λ1＝2(1-Pe) Epsilon. The method can eliminate the influence of temperature change on the fiber grating without additional temperature compensation.
The embodiments are not intended to limit the scope of the present invention, and all equivalent implementations or modifications without departing from the scope of the present invention are intended to be included in the scope of the present invention.
Claims (3)
1. The utility model provides an in-service stride structure member axial force test component greatly which characterized in that: the device comprises a supporting seat, a supporting beam, a cantilever beam, a fiber bragg grating and a transfer block; the support seat is fixedly connected with the inner surface of the rod piece to be detected in a welding mode, one end of the supporting beam is fixedly inserted on the support seat, the supporting beam is parallel to the rod piece to be detected, one end of the cantilever beam is fixedly connected with the other end of the supporting beam in a welding mode, the cantilever beam is perpendicular to the supporting beam, one end of the switching block is fixedly connected with the other end of the cantilever beam in a threaded mode, and the other end of the switching block is fixedly connected with the inner surface of the rod piece to be detected in a welding mode; the fiber grating is fixedly arranged on the upper surface of the cantilever beam and is parallel to the cantilever beam; the fiber grating is fixed on the cantilever beam by a fiber grating clamping component, and the fiber grating clamping component comprises a fiber grating clamping rod, a nut for clamping the fiber grating, a bolt for clamping the fiber grating and a flat washer for clamping the fiber grating; the number of the fiber grating clamping assemblies is two, and the two fiber grating clamping assemblies are respectively positioned at two ends of the fiber grating; the fiber grating clamping rod is of a U-shaped structure, the fiber grating penetrates through the middle of the fiber grating clamping rod, two support arms of the fiber grating clamping rod are long and short, the long support arm is fixedly connected with the upper surface of the cantilever beam in a welding mode, a bolt hole is formed between the long support arm and the short support arm, a bolt for clamping the fiber grating penetrates through the bolt holes of the long support arm and the short support arm, and a nut for clamping the fiber grating is screwed at the end part of the bolt for clamping the fiber grating; and flat washers for clamping the fiber bragg gratings are arranged between the screw cap of the bolt for clamping the fiber bragg gratings and the nut for clamping the fiber bragg gratings and the fiber bragg gratings.
2. The in-service long-span structural rod axial force testing member of claim 1, wherein: the middle part of the supporting beam is provided with a piezoelectric sensing alarm device, and a mounting hole for mounting the piezoelectric sensing device is formed in the beam body of the supporting beam; the piezoelectric sensing device comprises piezoelectric ceramics, a non-piezoelectric elastic layer and a charge amplifier; the piezoelectric ceramics are positioned in the mounting holes, and non-piezoelectric elastic layers are arranged between the upper surface and the lower surface of the piezoelectric ceramics and the wall of the mounting hole; the charge amplifier is arranged on the outer surface of the support beam, and the electric signal access end of the charge amplifier is electrically connected with the electric signal output end of the piezoelectric ceramic.
3. The in-service long-span structural rod axial force testing member of claim 1, wherein: the number of the cantilever beams is three, and the three cantilever beams are uniformly distributed along the circumference of the support beam; the cantilever beam is the uniform strength cantilever beam, and the upper and lower surface of cantilever beam all is isosceles trapezoid, and cantilever beam thickness everywhere equals.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010971847.XA CN112033587B (en) | 2020-09-16 | 2020-09-16 | In-service large-span structure rod piece axial force testing member |
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| CN202010971847.XA CN112033587B (en) | 2020-09-16 | 2020-09-16 | In-service large-span structure rod piece axial force testing member |
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| CN87207350U (en) * | 1987-07-31 | 1988-03-09 | 上海建筑材料工业学院 | Meter for measuring the resistance of pumping-concrete in pipe |
| JP2010014695A (en) * | 2008-06-03 | 2010-01-21 | Nitta Ind Corp | Multiaxial sensor |
| CN201535705U (en) * | 2009-04-23 | 2010-07-28 | 大连理工大学 | Fiber bragg grating pipeline stress hoop |
| CN105908753B (en) * | 2016-05-03 | 2018-04-27 | 东通岩土科技（杭州）有限公司 | Prestressing force axle power device connection structure built in building foundation pit steel pipe support |
| CN107976274B (en) * | 2018-01-18 | 2023-05-23 | 吉林大学 | Pressure detection device and method based on synchronous resonance |
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