CN114720039B - Method for measuring effective prestress under anchor of finish rolling deformed steel bar - Google Patents
Method for measuring effective prestress under anchor of finish rolling deformed steel bar Download PDFInfo
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- CN114720039B CN114720039B CN202210618302.XA CN202210618302A CN114720039B CN 114720039 B CN114720039 B CN 114720039B CN 202210618302 A CN202210618302 A CN 202210618302A CN 114720039 B CN114720039 B CN 114720039B
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 89
- 239000010959 steel Substances 0.000 title claims abstract description 89
- 238000000034 method Methods 0.000 title claims abstract description 32
- 238000005096 rolling process Methods 0.000 title claims abstract description 14
- 230000001133 acceleration Effects 0.000 claims abstract description 18
- 238000004873 anchoring Methods 0.000 claims description 11
- 238000004364 calculation method Methods 0.000 claims description 7
- 239000004677 Nylon Substances 0.000 claims description 3
- 229920001778 nylon Polymers 0.000 claims description 3
- 230000035515 penetration Effects 0.000 claims 1
- 238000001514 detection method Methods 0.000 abstract description 20
- 238000010586 diagram Methods 0.000 description 3
- 201000010099 disease Diseases 0.000 description 2
- 208000037265 diseases, disorders, signs and symptoms Diseases 0.000 description 2
- 238000003780 insertion Methods 0.000 description 2
- 230000037431 insertion Effects 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000011088 calibration curve Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000007405 data analysis Methods 0.000 description 1
- 238000013500 data storage Methods 0.000 description 1
- 239000011513 prestressed concrete Substances 0.000 description 1
- 238000010079 rubber tapping Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 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
- G01L5/00—Apparatus for, or methods of, measuring force, work, mechanical power, or torque, specially adapted for specific purposes
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01H—MEASUREMENT OF MECHANICAL VIBRATIONS OR ULTRASONIC, SONIC OR INFRASONIC WAVES
- G01H11/00—Measuring mechanical vibrations or ultrasonic, sonic or infrasonic waves by detecting changes in electric or magnetic properties
- G01H11/06—Measuring mechanical vibrations or ultrasonic, sonic or infrasonic waves by detecting changes in electric or magnetic properties by electric means
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Abstract
The invention discloses a method for measuring effective prestress under a finish rolling deformed steel bar anchor, which comprises the steps of fixing an acceleration sensor on one side of a bare end of the finish rolling deformed steel bar through a magnetic clamping seat; knocking the other side of the exposed end of the finish-rolled deformed steel bar by an exciting hammer; then, acquiring a vibration signal generated in the knocking process of the finish-rolled deformed steel bar through the acceleration sensor and determining a first curve equation based on the vibration signal; stretching the field deformed steel bars to 20%, 40%, 60%, 80% and 100% of the design values in a grading manner, calibrating the parameters, and determining a second curve equation and key parameters thereof after calibration is completed; and finally, substituting the key parameters into the first curve equation to determine the effective prestress of the finish rolling deformed steel bar, thereby realizing the rapid and accurate detection of the vertical prestress of the finish rolling deformed steel bar.
Description
Technical Field
The invention belongs to the technical field of finish rolling deformed steel bar prestress detection, and particularly relates to a method for measuring effective prestress under an anchor of finish rolling deformed steel bar.
Background
The large-span prestressed concrete box girder is more and more widely applied to domestic bridges, the detection reports of diseases related to the girder type also tend to increase, the occurrence of the diseases seriously reduces the whole service life of the bridge, and unnecessary economic loss is caused. The cracks are caused when the bridge web plates are cracked, and the main reason is that the vertical prestress of the beam body deformed steel bar is insufficient or under-tensioned.
At present, the detection method for the vertical prestress of the deformed steel bar mainly comprises nondestructive detection and reverse-pulling detection, equipment such as an oil pump, a jack, a reaction frame and the like is needed in the reverse-pulling method, carrying and moving are particularly troublesome in the detection process, the detection progress is influenced, the detection time is long, the detection time of the prestress of the average deformed steel bar needs at least 20 minutes, the vertical prestress of most finish-rolled deformed steel bars needs to be detected completely on site, the detection task is heavy, the detection efficiency easily influences the construction progress of the whole project, the detection efficiency of the nondestructive detection method is higher than that of the reverse-pulling method, the method for detecting the end vibration frequency and the tension force of the deformed steel bar through fitting is available on the market at present, and the detection precision is very low.
Therefore, how to rapidly and accurately detect the vertical prestress of the deformed steel bar is a technical problem to be solved urgently by the technical personnel in the field.
Disclosure of Invention
The invention aims to quickly and accurately detect the vertical prestress of deformed steel bar, and provides a method for measuring the effective prestress under a finish rolling deformed steel bar anchor.
The technical scheme of the invention is as follows: a method for measuring effective prestress under a finish rolling deformed steel bar anchor comprises the following steps:
s1, fixing an acceleration sensor at one side of the exposed end of the finish-rolled deformed steel bar;
s2, knocking the other side of the finish-rolled deformed steel bar bare end through an exciting hammer;
s3, collecting vibration signals generated in the knocking process of the finish-rolled deformed steel bar through the acceleration sensor and determining a first curve equation based on the vibration signals;
s4, stretching the field deformed steel bars to 20%, 40%, 60%, 80% and 100% of the design values in a grading manner, calibrating the parameters, and determining a second curve equation and key parameters thereof after calibration is completed;
and S5, substituting the key parameters into the first curve equation to determine the effective prestress of the finish-rolled deformed steel bar.
Further, the acceleration sensor is fixedly connected with the finish-rolled deformed steel bar through a magnetic clamping seat.
Further, in the step S2, the hitting point of the vibration hammer and the acceleration sensor are located on the same horizontal line, and the hammer head of the vibration hammer is made of nylon or rubber.
Further, in the step S2, the time interval between every two adjacent taps in the tapping process of the vibration hammer is not less than 2 seconds.
Further, the first curve equation is used for calculating the effective prestress of the finish-rolled deformed steel bar, the second curve equation is used for calibrating the effective prestress of the field deformed steel bar, and the first curve equation is shown as the following formula:
wherein:
in the formula,
for the purpose of calculating the linear density,
in order to anchor the linear density of the nut segments,
the linear density of the exposed length of the finish-rolled deformed steel bar,I 1 in order to anchor the moment of inertia of the nut section,I 2 is the moment of inertia of the exposed length of the finish rolled deformed steel bar,
is the sum of the exposed length of the finish-rolled deformed steel bar, the height of the anchoring nut and the embedding depth of the anchoring nut,
to obtain the natural frequency based on the vibration signal,
in order to anchor the depth of insertion of the nut,
in order to anchor the height of the nut,
in order to finish-roll the exposed length of the deformed steel bar,
in order to calculate the moment of inertia for the purpose,
in order to be the modulus of elasticity,
in order to be pre-stressed,
and
for the purpose of the said key parameter(s),
the number of Euler is the number of Euler,
the diameter of the finish-rolled deformed steel bar.
Compared with the prior art, the invention has the following beneficial effects:
the invention fixes an acceleration sensor on one side of the exposed end of the finish-rolled deformed steel bar through a magnetic clamping seat; knocking the other side of the exposed end of the finish-rolled deformed steel bar by an exciting hammer; then, acquiring a vibration signal generated in the knocking process of the finish-rolled deformed steel bar through the acceleration sensor and determining a first curve equation based on the vibration signal; stretching the field deformed steel bars to 20%, 40%, 60%, 80% and 100% of the design values in a grading manner, calibrating the parameters, and determining a second curve equation and key parameters thereof after calibration is completed; and finally, substituting the key parameters into the first curve equation to determine the effective prestress of the finish-rolled deformed steel bar, so that the vertical prestress of the finish-rolled deformed steel bar can be quickly and accurately detected.
Drawings
FIG. 1 is a schematic flow chart illustrating a method for measuring effective prestress under a finish-rolled deformed steel bar anchor according to an embodiment of the present invention;
FIG. 2 is a diagram of a calculation model of an equivalent length method according to an embodiment of the present invention;
FIG. 3 is a schematic diagram of a calibration curve in an example of the calculation of the present invention.
Detailed Description
The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
The application provides a method for measuring effective prestress under a finish rolling deformed steel bar anchor, and as shown in figure 1, the method is a flow schematic diagram of the method, and the method comprises the following steps:
and S1, fixing an acceleration sensor at one side of the bare end of the finish-rolled deformed steel bar.
In the embodiment of the application, the acceleration sensor is connected with the finish-rolled deformed steel bar through the magnetic clamping seat.
And step S2, knocking the other side of the finish-rolled deformed steel bar bare end through an exciting hammer.
In this application embodiment, in step S2 the point of strikeing of exciting the hammer with acceleration sensor is located same water flat line, just the tup of exciting the hammer is nylon material or rubber material, can effectively prevent to strike the influence of dynamics to gathering the signal quality, in step S2 the interval time of every two adjacent strikings in exciting the hammer process is not less than 2 seconds, can ensure vibration signal' S quality.
And step S3, collecting vibration signals generated in the knocking process of the finish-rolled deformed steel bar through the acceleration sensor and determining a first curve equation based on the vibration signals.
Specifically, the acceleration sensor can be a 305 charge acceleration sensor, has a wide frequency response range, is connected with the detection device through a data line, and the detection device can be an ultra-thin notebook industrial host, and comprises a data acquisition system and a data analysis system.
And step S4, stretching the field deformed steel bars to 20%, 40%, 60%, 80% and 100% of the design values in a grading manner, calibrating the parameters, and determining a second curve equation and key parameters thereof after calibration is completed.
And step S5, substituting the key parameters into the first curve equation to determine the effective prestress of the finish rolling deformed steel bar.
In the embodiment of the present application, the first curve equation is used to calculate the effective prestress of the finish-rolled deformed steel bar, the second curve equation is used to calibrate the effective prestress parameter of the on-site deformed steel bar, and the first curve equation is expressed by the following formula:
wherein:
in the formula,
for the purpose of calculating the linear density,
in order to anchor the linear density of the nut segments,
the linear density of the exposed length of the finish-rolled deformed steel bar,I 1 in order to anchor the moment of inertia of the nut section,I 2 the moment of inertia of the exposed length of the finish rolled deformed steel bar,
is the sum of the exposed length of the finish-rolled deformed steel bar, the height of the anchoring nut and the embedding depth of the anchoring nut,
to obtain the natural frequency based on the vibration signal,
in order to anchor the depth of insertion of the nut,
in order to anchor the height of the nut,
in order to finish-roll the exposed length of the deformed steel bar,
in order to calculate the moment of inertia for the purpose,
in order to be the modulus of elasticity,
in order to be pre-stressed,
and
for the purpose of the said key parameter(s),
the number of Euler is the number of Euler,
the diameter of the finish-rolled deformed steel bar.
In addition: wherein
Is to calculate the moment of inertia for the purpose,
Wherein,
7850kg/m3 is taken as the density of the deformed steel bar;
Specifically, the calculation formula of the application simplifies the part to which the detection method is applied into a cantilever beam model, and determines the effective prestress under the anchor of the finish-rolled deformed steel bar through an equivalent length method shown in figure 2, wherein in figure 2, the diameter of the finish-rolled deformed steel bar
Typically 0.032 m;
for calculating the diameter, i.e. d in FIG. 2 2 Length of exposure
Generally not more than 0.3 m; anchoring nut edge-to-edge distance
Generally, 0.062 is taken; height of anchoring nut
Generally taking 0.072 m; depth of embedding
The size of the nut is related to the tension force, the diameter of the nut, the anchor backing plate and the like.
In the method, the detection equipment has a continuous acquisition function, can realize automatic data storage in the acquisition process, is not easy to trigger by mistake, effectively improves the data acquisition efficiency, and ensures that at least 5 effective data are stored in each finish rolling deformed steel bar in the acquisition process.
The data acquisition comprises calibration data acquisition and test data acquisition, wherein the calibration data acquisition refers to the step of stretching the field finish-rolled deformed steel bars to 20%, 40%, 60%, 80% and 100% of the control tension in a grading manner, each stage is subjected to corresponding signal acquisition, and finally the calibrated parameters can be calibrated and calculated according to actual needs. The test data acquisition refers to the acquisition of corresponding waveform data of the finish-rolled deformed steel bar (100% design tension control stress) which needs to be detected on site.
That is, according to the technical scheme of the application, the second curve equation is fitted through data of the on-site deformed steel bar to obtain the key parameters m and n, and then the parameters m and n are substituted into the first curve equation of the finish-rolled deformed steel bar to be detected to determine the effective prestress of the finish-rolled deformed steel bar.
Calculation example: the prestress of 7 deformed steels on site is calibrated by parameters, namely deformed steel 1 (exposed length 174mm, and prestress, namely tension is 569 KN), deformed steel 2 (exposed length 124mm, and prestress 522 KN), deformed steel 3 (exposed length 111mm, and prestress 518 KN), deformed steel 4 (exposed length 201mm, and prestress 566 KN), and relevant parameters are respectively substituted into equations (1), (2), (3) and (6) to obtain m = -19.99, and n =2993.79, wherein a calibrated curve is shown in figure 3 and namely the second curve equation.
When the prestress of a certain finish-rolled deformed steel bar is detected, the actual exposed length of the deformed steel bar
=165mm (known),
=72mm，
=62mm, the self-vibration frequency of the deformed steel bar can be directly measured by a detection device, and the normalized embedding length is calculated by the formulas (1), (2) and (3)
=87.43mm, F =506KN is obtained from formula (6).
It will be appreciated by those of ordinary skill in the art that the embodiments described herein are intended to assist the reader in understanding the principles of the invention and are to be construed as being without limitation to such specifically recited embodiments and examples. Those skilled in the art can make various other specific changes and combinations based on the teachings of the present invention without departing from the spirit of the invention, and these changes and combinations are within the scope of the invention.
Claims (4)
1. A method for measuring effective prestress under a finish-rolled deformed steel bar anchor is characterized by comprising the following steps:
s1, fixing an acceleration sensor at one side of the exposed end of the finish-rolled deformed steel bar;
s2, knocking the other side of the finish-rolled deformed steel bar bare end through an exciting hammer;
s3, collecting vibration signals generated in the knocking process of the finish-rolled deformed steel bar through the acceleration sensor and determining a first curve equation based on the vibration signals;
s4, stretching the field deformed steel bars to 20%, 40%, 60%, 80% and 100% of the design values in a grading manner, calibrating the parameters, and determining a second curve equation and key parameters thereof after calibration is completed;
s5, substituting the key parameters into the first curve equation to determine the effective prestress of the finish-rolled deformed steel bar;
the first curve equation is used for calculating the effective prestress of the finish-rolled deformed steel bar, the second curve equation is used for calibrating the effective prestress of the on-site deformed steel bar, and the first curve equation is shown in the following formula:
wherein:
L 0 ＝L c -L 1 -L 2
η L ＝L 0 /d 0
in the formula, q c For calculation of the linear density, q 1 To anchor the linear density of the nut section, q 2 Linear density of exposed length of finish-rolled deformed steel bar, I 1 Moment of inertia, I, for anchoring nut segments 2 Moment of inertia, L, of exposed length of finish-rolled deformed steel bar c F is the sum of the exposed length of the finish-rolled deformed steel bar, the height of the anchoring nut and the embedding depth of the anchoring nut 1 For the natural frequency, L, derived on the basis of said vibration signal 0 Depth of penetration, L, for anchoring nuts 1 For anchoring the height of the nut, L 2 For finish rolling of the exposed length of the deformed steel bar, I c For the calculation of the moment of inertia, E is the modulus of elasticity, F is the prestress, m and n are the key parameters, E is the Euler number, d 0 The diameter of the finish-rolled deformed steel bar.
2. The method of measuring effective prestress under an anchor of finish-rolled deformed steel bar according to claim 1, wherein the acceleration sensor is fixedly connected to the finish-rolled deformed steel bar through a magnetic clamping seat.
3. The method of measuring effective prestress under an anchor of finish-rolled deformed steel bar according to claim 1, wherein the striking point of the vibration exciter and the acceleration sensor are located on the same horizontal line in the step S2, and a hammer head of the vibration exciter is made of nylon or rubber.
4. The method of measuring effective prestress under an anchor of finish rolled threaded steel according to claim 1, wherein an interval time between every two adjacent impacts in the impact hammer impact process in the step S2 is not less than 2 seconds.
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