CN115096484A - Force measuring device and method for bridge stress monitoring - Google Patents
Force measuring device and method for bridge stress monitoring Download PDFInfo
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- CN115096484A CN115096484A CN202210706331.1A CN202210706331A CN115096484A CN 115096484 A CN115096484 A CN 115096484A CN 202210706331 A CN202210706331 A CN 202210706331A CN 115096484 A CN115096484 A CN 115096484A
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- 238000012544 monitoring process Methods 0.000 title claims abstract description 72
- 238000000034 method Methods 0.000 title claims abstract description 23
- 239000000835 fiber Substances 0.000 claims abstract description 47
- 239000013307 optical fiber Substances 0.000 claims abstract description 21
- 230000008859 change Effects 0.000 description 11
- 238000005259 measurement Methods 0.000 description 5
- 230000002457 bidirectional effect Effects 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000000691 measurement method Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000004044 response Effects 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
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Classifications
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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
- G01L1/246—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 using integrated gratings, e.g. Bragg gratings
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L5/00—Apparatus for, or methods of, measuring force, work, mechanical power, or torque, specially adapted for specific purposes
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Force Measurement Appropriate To Specific Purposes (AREA)
Abstract
The invention discloses a force measuring device and method for bridge stress monitoring, wherein the device comprises: the first connecting plate and the second connecting plate are respectively used for being connected with two measured planes on the bridge; the two ends of the sensing arm are respectively hinged with the first connecting plate and the second connecting plate, and the sensing arm is provided with an optical fiber sensor; the fiber grating demodulator is connected with the fiber sensor; the analysis unit is connected with the fiber grating demodulator, and is used for acquiring the variation of the relative distance between two measured planes according to the monitoring signal of the fiber sensor output by the fiber grating demodulator and calculating the stress of the bridge according to the variation; the device has the sensing arm that both ends articulate respectively on first connecting plate and second connecting plate, is provided with optical fiber sensor on the sensing arm, can accurately monitor the relative distance variable quantity between two measured planes on the bridge through optical fiber sensor to can calculate the atress of bridge.
Description
Technical Field
The invention belongs to the technical field of bridge stress monitoring, and particularly relates to a force measuring device and method for bridge stress monitoring.
Background
A common bridge is usually designed into a bidirectional lane, so that the passing convenience is increased. With the pressure of traffic capacity, the bidirectional lanes designed for the bridge are more and more, and the bridge pressure caused by driving under the condition, particularly the torsional pressure, can increase the potential safety hazard. Therefore, monitoring stress changes of the bridge structure in real time, particularly positive pressure and torsional stress, becomes an important safety measure. For the force measurement of the bridge, the force measurement is mainly concentrated between a capping beam of a pier and a main beam of the bridge, the distance between the capping beam and the main beam has certain difference in different bridge designs, and even if the capping beam and the main beam are the same bridge, the distance cannot be completely unified due to construction reasons. The method is a challenge for installing the force measuring device, and the difficulty in designing is how to simply and flexibly install the force measuring device between monitoring surfaces with different distances to accurately measure the force of the bridge.
Disclosure of Invention
The invention aims to provide a force measuring device and a method for monitoring bridge stress aiming at the difficulty of bridge force measurement in the prior art, the device is provided with a sensing arm, two ends of the sensing arm are respectively hinged on a first connecting plate and a second connecting plate, an optical fiber sensor is arranged on the sensing arm, the variation of the relative distance between two measured planes on a bridge can be accurately monitored through the optical fiber sensor, the current stress condition of the bridge is further measured and calculated through the variation, the device can adapt to the condition of different distances between the two measured planes, and the device is convenient and flexible to install.
In order to achieve the above object, the present invention provides a force measuring device for bridge stress monitoring, the device comprising:
the first connecting plate and the second connecting plate are respectively used for being connected with two measured planes on a bridge;
the two ends of the sensing arm are respectively hinged with the first connecting plate and the second connecting plate, and the sensing arm is provided with an optical fiber sensor;
the fiber grating demodulator is connected with the fiber sensor;
and the analysis unit is connected with the fiber grating demodulator, and is used for acquiring the variation of the relative distance between two measured planes according to the monitoring signal of the fiber sensor output by the fiber grating demodulator and calculating the stress of the bridge according to the variation.
Optionally, the first connecting plate and the second connecting plate are respectively arranged between the bent cap and the main beam of the bridge.
Optionally, the optical fiber sensor is a long-gauge fiber grating.
Optionally, two ends of the sensing arm are hinged to the first connecting plate and the second connecting plate through movable shafts respectively.
Optionally, the sensor further comprises a temperature compensation grating, the temperature compensation grating and the grating sensor are arranged on the sensing arm side by side, only one end of the temperature compensation grating is fixed on the sensing arm, so that the temperature compensation grating does not respond to deformation of the sensing arm, and the temperature compensation grating is used for monitoring deformation of the sensing arm caused by temperature change.
Optionally, the analysis unit can correct the relative distance variation between the two measured planes according to the monitoring result of the temperature compensation grating.
The invention also provides a force measuring method for bridge stress monitoring, which utilizes the force measuring device for bridge stress monitoring and comprises the following steps:
respectively fixing a first connecting plate and a second connecting plate on two measured planes on a bridge;
and acquiring the variation of the relative distance between two measured planes according to the monitoring signal of the optical fiber sensor output by the fiber grating demodulator, and calculating the stress of the bridge according to the variation.
Optionally, the fixing the first connecting plate and the second connecting plate on two measured planes of the bridge respectively includes:
fixing a first connecting plate on a plane to be measured;
the second connecting plate is fixed on the other measured plane, so that the sensing arm is subjected to set pressure.
Optionally, the method further comprises:
a temperature compensation grating is arranged on the sensing arm and parallel to the grating sensor;
and correcting the variation of the relative distance between the two measured planes according to the monitoring result of the temperature compensation grating.
Optionally, a plurality of force measuring devices for bridge stress monitoring are mounted on the bridge, and the torsional stress change of the bridge is evaluated according to the monitoring results of the plurality of force measuring devices for bridge stress monitoring.
The invention provides a force measuring device and method for monitoring bridge stress, which has the beneficial effects that:
1. the device is provided with a sensing arm, two ends of the sensing arm are respectively hinged to a first connecting plate and a second connecting plate, an optical fiber sensor is arranged on the sensing arm, the variation of the relative distance between two measured planes on a bridge can be accurately monitored through the optical fiber sensor, the current bearing condition of the bridge is further measured and calculated through the variation, the device can adapt to the condition that the distance between the two measured planes is different, and the device is convenient and flexible to install;
2. the device is also provided with a temperature compensation grating, and the analysis unit can correct the pressure between the two measured planes according to the monitoring result of the temperature compensation grating, so that the influence of temperature on stress is eliminated, and the monitoring accuracy is improved;
3. the method can monitor the pressure conditions of different positions on the bridge by measuring the variation of the relative distance between the measured planes at the specified positions by using a plurality of the devices, and estimate the torsional stress variation of the bridge according to the monitoring results of a plurality of force measuring devices for bridge stress monitoring.
Additional features and advantages of the invention will be set forth in the detailed description which follows.
Drawings
The above and other objects, features and advantages of the present invention will become more apparent by describing in more detail exemplary embodiments thereof with reference to the attached drawings, in which like reference numerals generally represent like parts throughout.
Fig. 1 shows a schematic structural view of a force-measuring device for bridge stress monitoring according to an embodiment of the invention.
FIG. 2 illustrates a flow diagram of a force measurement method for bridge stress monitoring, according to an embodiment of the present invention.
Description of reference numerals:
1. a first connecting plate; 2. a second connecting plate; 3. a sensing arm; 4. a grating sensor; 5. a movable shaft.
Detailed Description
Preferred embodiments of the present invention will be described in more detail below. While the following describes preferred embodiments of the present invention, it should be understood that the present invention may be embodied in various forms and should not be limited by the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art.
The invention provides a force measuring device for monitoring bridge stress, which comprises:
the first connecting plate and the second connecting plate are respectively used for being connected with two measured planes on a bridge;
the two ends of the sensing arm are respectively hinged with the first connecting plate and the second connecting plate, and the sensing arm is provided with an optical fiber sensor;
the fiber grating demodulator is connected with the fiber sensor;
and the analysis unit is connected with the fiber grating demodulator, and is used for acquiring the variation of the relative distance between the two measured planes according to the monitoring signal of the fiber sensor output by the fiber grating demodulator and calculating the stress of the bridge according to the variation.
Specifically, mounting holes can be formed in the first connecting plate and the second connecting plate, the first connecting plate and the second connecting plate can be fixed between two measured planes through the mounting holes, the first connecting plate, the second connecting plate and the sensing arm of the device form a Z-shaped support structure, and the distance between the first connecting plate and the second connecting plate can be flexibly adjusted to adapt to the use of the two measured planes with different distances; the optical fiber sensor on the sensing arm can generate strain along with the stress deformation of the sensing arm, the fiber grating demodulator can demodulate monitoring signals of the optical fiber sensor, the variation of the relative distance between two measured planes can be obtained by demodulating the peak position movement of the optical fiber sensor, and the analysis unit can measure and calculate the current bearing condition of the bridge through the variation, so that the force measuring effect of the bridge is achieved.
Optionally, the first and second connection plates are between the cap beam and the main beam of the bridge, respectively.
Specifically, the strain measurement between the capping beam of the pier and the main beam of the bridge is representative of the strain measurement of the bridge.
Optionally, the fiber optic sensor is a long-gauge fiber grating.
Specifically, a long-gauge fiber grating is used as a grating sensor, and the long-gauge fiber grating is arranged on a sensing arm and can measure the expansion change of the sensing arm; the long-gauge-length fiber grating is connected into a fiber grating demodulator, and the variation of the relative distance between two measured planes monitored by each force measuring device for bridge stress monitoring is obtained by demodulating the peak position movement of the long-gauge-length fiber grating.
Optionally, both ends of the sensing arm are hinged to the first connecting plate and the second connecting plate respectively through movable shafts.
Specifically, the sensing arm with the movable shaft can adjust the distance between the first connecting plate and the second connecting plate according to different installation positions of the first connecting plate and the second connecting plate.
Optionally, the sensor further comprises a temperature compensation grating, the temperature compensation grating is arranged on the sensing arm side by side with the grating sensor, and the temperature compensation grating is used for monitoring deformation of the sensing arm caused by temperature change.
Specifically, the temperature compensation grating is arranged near the long-gauge fiber grating, the single end of the temperature compensation grating is fixed, no response is caused to the deformation of the supporting arm, and the temperature compensation grating is used for monitoring the deformation of the sensing arm caused by the temperature change of different sensing arm positions.
Alternatively, the analysis unit can correct the variation of the relative distance between the two measured planes according to the monitoring result of the temperature compensation grating.
The invention also provides a force measuring method for bridge stress monitoring, which utilizes the force measuring device for bridge stress monitoring and comprises the following steps:
respectively fixing a first connecting plate and a second connecting plate on two measured planes on a bridge;
and acquiring the relative distance variation between the two measured planes according to the monitoring signal of the optical fiber sensor output by the fiber grating demodulator, and calculating the stress of the bridge according to the variation.
Optionally, fixing the first connecting plate and the second connecting plate on two measured planes on the bridge respectively includes:
fixing a first connecting plate on a plane to be measured;
the second connecting plate is fixed on the other measured plane, so that the sensing arm is subjected to set pressure.
Optionally, the method further comprises:
a temperature compensation grating is arranged on the sensing arm and parallel to the grating sensor;
and correcting the relative distance deformation between the two measured planes according to the monitoring result of the temperature compensation grating.
Optionally, a plurality of force measuring devices for bridge stress monitoring are mounted on the bridge, and the torsional stress change of the bridge is evaluated according to the monitoring results of the plurality of force measuring devices for bridge stress monitoring.
Specifically, by installing a plurality of force measuring devices for bridge stress monitoring on two sides of a bridge, the torsional stress change of the whole bridge can be calculated and evaluated through the change of positive pressure monitored by each force measuring device for bridge stress monitoring.
Examples
As shown in FIG. 1, the present invention provides a force measuring device for bridge stress monitoring, the device comprising:
the device comprises a first connecting plate 1 and a second connecting plate 2, wherein the first connecting plate 1 and the second connecting plate 2 are respectively used for being connected with two measured planes on a bridge;
the optical fiber sensor comprises a sensing arm 3, wherein two ends of the sensing arm 3 are respectively hinged with a first connecting plate 1 and a second connecting plate 2, and an optical fiber sensor 4 is arranged on the sensing arm 3;
the fiber grating demodulator is connected with the fiber sensor 4;
and the analysis unit is connected with the fiber grating demodulator, and is used for acquiring the variation of the relative distance between the two measured planes according to the monitoring signal of the optical fiber sensor 4 output by the fiber grating demodulator and calculating the stress of the bridge according to the variation.
In this embodiment, the first connecting plate 1 and the second connecting plate 2 are respectively arranged between the cap beam and the main beam of the bridge.
In this embodiment, the fiber sensor 4 is a long-gauge fiber grating.
In the present embodiment, the two ends of the sensing arm 3 are respectively hinged with the first connecting plate 1 and the second connecting plate 2 through the movable shaft 5.
In this embodiment, the temperature compensation grating is further included, the temperature compensation grating and the grating sensor are arranged on the sensing arm 3 side by side, only one end of the temperature compensation grating is fixed on the sensing arm 3, the temperature compensation grating does not respond to deformation of the sensing arm 3, and the temperature compensation grating is used for monitoring deformation of the sensing arm 3 caused by temperature change.
In this embodiment, the analysis unit can correct the variation of the relative distance between the two measured planes according to the monitoring result of the temperature compensation grating.
As shown in fig. 2, the present invention further provides a force measuring method for bridge stress monitoring, which utilizes the above force measuring device for bridge stress monitoring, and the method includes:
respectively fixing a first connecting plate and a second connecting plate on two measured planes on a bridge;
and acquiring the relative distance variation between the two measured planes according to the monitoring signal of the optical fiber sensor output by the fiber grating demodulator, and calculating the stress of the bridge according to the variation.
In this embodiment, fixing the first connecting plate and the second connecting plate on two measured planes of the bridge respectively includes:
fixing a first connecting plate on a plane to be measured;
the second connecting plate is fixed on the other measured plane, so that the sensing arm is subjected to set pressure.
In this embodiment, the method further includes:
a temperature compensation grating is arranged on the sensing arm and in parallel with the grating sensor;
and correcting the variation of the relative distance between the two measured planes according to the monitoring result of the temperature compensation grating.
In this embodiment, a plurality of force measuring devices for bridge stress monitoring are installed on a bridge, and the torsional stress variation of the bridge is evaluated according to the monitoring results of the plurality of force measuring devices for bridge stress monitoring.
In summary, when the force measuring method for bridge stress monitoring provided by the present invention is implemented, the monitoring process using the force measuring device for bridge stress monitoring is as follows:
1. the flat position is selected on the bridge, so that the first connecting plate 1 and the second connecting plate 2 can be stably arranged between two measured planes.
2. The second connecting plate 2 is fixed on a plane to be measured, the fixing mode can be welding or bolting, and the second connecting plate 2 and the plane to be measured do not slide horizontally in the fixing process.
3. The device is manually opened, a transverse force is applied to the first connecting plate 1, a scheme of installing hammer knocking or a transverse jack can be adopted, so that the sensing arm 3 is stressed and preset stress is applied to the sensing arm, and the preset stress is set pressure; in the process, the long-gauge-length fiber grating is monitored by a fiber grating demodulator, and after the set pressure requirement is met, the first connecting plate 1 is fixed on the other measured plane; through presetting of set pressure, the device can simultaneously measure the positive pressure of pressing and stretching between two measured planes; alternatively, the reverse sequence may be selected, first securing the first web 1, then opening the device, applying a lateral force to the second web 2 and creating a set pressure, and then securing the second web 2.
4. A plurality of the devices are arranged at different positions of a bridge, all the grating sensors 4 are connected to a fiber grating demodulator, and the positive pressure change of each device is obtained by demodulating the peak position movement of the long gauge length fiber grating.
5. The temperature stress compensation is obtained by demodulating the peak position movement of the temperature compensation grating, and the positive pressure measured by the long gauge length fiber grating is corrected.
6. And obtaining the stress condition of the bridge through the change of the corrected positive pressure.
7. And comparing the stress with the preset stress limit of the bridge in the database, and giving a record and an alarm to the system and informing a responsible person of the condition that the stress exceeds the preset stress limit.
Having described embodiments of the present invention, the foregoing description is intended to be exemplary, not exhaustive, and not limited to the embodiments disclosed. Many modifications and variations will be apparent to those of ordinary skill in the art without departing from the scope and spirit of the described embodiments.
Claims (10)
1. A force measuring device for bridge stress monitoring, the device comprising:
the first connecting plate and the second connecting plate are respectively used for being connected with two measured planes on a bridge;
the two ends of the sensing arm are respectively hinged with the first connecting plate and the second connecting plate, and the sensing arm is provided with an optical fiber sensor;
the fiber bragg grating demodulator is connected with the fiber optic sensor;
and the analysis unit is connected with the fiber grating demodulator, and is used for acquiring the variation of the relative distance between two measured planes according to the monitoring signal of the fiber sensor output by the fiber grating demodulator and calculating the stress of the bridge according to the variation.
2. The force measuring device for bridge stress monitoring of claim 1, wherein the first and second connection plates are between the cap beam and the main beam of the bridge, respectively.
3. The force measuring device for bridge stress monitoring of claim 1, wherein the fiber optic sensor is a long gauge fiber grating.
4. The force measuring device for bridge stress monitoring according to claim 1, wherein both ends of the sensor arm are hinged to the first connecting plate and the second connecting plate through a movable shaft, respectively.
5. The force-measuring device for bridge stress monitoring of claim 1, further comprising a temperature compensation grating, said temperature compensation grating being disposed on said sensing arm alongside said grating sensor, only one end of said temperature compensation grating being fixed to said sensing arm such that said temperature compensation grating is unresponsive to deformation of said sensing arm, said temperature compensation grating being configured to monitor deformation of said sensing arm caused by temperature changes.
6. Force-measuring device for bridge stress monitoring according to claim 5, wherein the analysis unit is able to correct the variation of the relative distance between the two measured planes according to the monitoring result of the temperature compensation grating.
7. Force measuring method for bridge stress monitoring, using a force measuring device for bridge stress monitoring according to any of claims 1-6, characterized in that the method comprises:
respectively fixing a first connecting plate and a second connecting plate on two measured planes on a bridge;
and acquiring the variation of the relative distance between two measured planes according to the monitoring signal of the optical fiber sensor output by the fiber grating demodulator, and calculating the stress of the bridge according to the variation.
8. The method of claim 7, wherein the step of securing the first and second attachment plates to the two planes of the bridge to be measured comprises:
fixing a first connecting plate on a plane to be measured;
the second connecting plate is fixed on the other measured plane, so that the sensing arm is subjected to set pressure.
9. The method of claim 7, further comprising:
a temperature compensation grating is arranged on the sensing arm and in parallel with the grating sensor;
and correcting the variation of the relative distance between the two measured planes according to the monitoring result of the temperature compensation grating.
10. The method according to claim 7, wherein a plurality of said force-measuring devices for bridge stress monitoring are installed on a bridge, and the torsional stress variation of said bridge is evaluated based on the monitoring results of said plurality of said force-measuring devices for bridge stress monitoring.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202210706331.1A CN115096484A (en) | 2022-06-21 | 2022-06-21 | Force measuring device and method for bridge stress monitoring |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202210706331.1A CN115096484A (en) | 2022-06-21 | 2022-06-21 | Force measuring device and method for bridge stress monitoring |
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2022
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| GB0427051D0 (en) * | 2004-12-09 | 2005-01-12 | Insensys Ltd | Interstice displacement sensor and sensing apparatus |
| CN101162157A (en) * | 2007-11-14 | 2008-04-16 | 山东大学 | Surface mounting or welding type stress-strain test sensing unit |
| US20120154821A1 (en) * | 2010-03-31 | 2012-06-21 | Glen Peter Koste | System for monitoring a relative displacement of components |
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