CN110988117B - Test method for calibrating active restraining force and ultrasonic wave of FRP (fiber reinforced Plastic) reinforced concrete column - Google Patents

Test method for calibrating active restraining force and ultrasonic wave of FRP (fiber reinforced Plastic) reinforced concrete column Download PDF

Info

Publication number
CN110988117B
CN110988117B CN201910999443.9A CN201910999443A CN110988117B CN 110988117 B CN110988117 B CN 110988117B CN 201910999443 A CN201910999443 A CN 201910999443A CN 110988117 B CN110988117 B CN 110988117B
Authority
CN
China
Prior art keywords
frp
ultrasonic
concrete column
concrete
reinforced concrete
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Active
Application number
CN201910999443.9A
Other languages
Chinese (zh)
Other versions
CN110988117A (en
Inventor
梁鸿骏
卢亦焱
李杉
胡霁月
蒋燕鞠
黄悦
赵鹏抟
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Wuhan University WHU
Original Assignee
Wuhan University WHU
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Wuhan University WHU filed Critical Wuhan University WHU
Priority to CN201910999443.9A priority Critical patent/CN110988117B/en
Publication of CN110988117A publication Critical patent/CN110988117A/en
Application granted granted Critical
Publication of CN110988117B publication Critical patent/CN110988117B/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Images

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N29/00—Investigating or analysing materials by the use of ultrasonic, sonic or infrasonic waves; Visualisation of the interior of objects by transmitting ultrasonic or sonic waves through the object
    • G01N29/04—Analysing solids
    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04G—SCAFFOLDING; FORMS; SHUTTERING; BUILDING IMPLEMENTS OR AIDS, OR THEIR USE; HANDLING BUILDING MATERIALS ON THE SITE; REPAIRING, BREAKING-UP OR OTHER WORK ON EXISTING BUILDINGS
    • E04G21/00—Preparing, conveying, or working-up building materials or building elements in situ; Other devices or measures for constructional work
    • E04G21/12—Mounting of reinforcing inserts; Prestressing
    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04G—SCAFFOLDING; FORMS; SHUTTERING; BUILDING IMPLEMENTS OR AIDS, OR THEIR USE; HANDLING BUILDING MATERIALS ON THE SITE; REPAIRING, BREAKING-UP OR OTHER WORK ON EXISTING BUILDINGS
    • E04G23/00—Working measures on existing buildings
    • E04G23/02—Repairing, e.g. filling cracks; Restoring; Altering; Enlarging
    • E04G23/0218—Increasing or restoring the load-bearing capacity of building construction elements
    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04G—SCAFFOLDING; FORMS; SHUTTERING; BUILDING IMPLEMENTS OR AIDS, OR THEIR USE; HANDLING BUILDING MATERIALS ON THE SITE; REPAIRING, BREAKING-UP OR OTHER WORK ON EXISTING BUILDINGS
    • E04G23/00—Working measures on existing buildings
    • E04G23/02—Repairing, e.g. filling cracks; Restoring; Altering; Enlarging
    • E04G23/0218—Increasing or restoring the load-bearing capacity of building construction elements
    • E04G23/0225—Increasing or restoring the load-bearing capacity of building construction elements of circular building elements, e.g. by circular bracing
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
    • G01N3/08—Investigating strength properties of solid materials by application of mechanical stress by applying steady tensile or compressive forces
    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04G—SCAFFOLDING; FORMS; SHUTTERING; BUILDING IMPLEMENTS OR AIDS, OR THEIR USE; HANDLING BUILDING MATERIALS ON THE SITE; REPAIRING, BREAKING-UP OR OTHER WORK ON EXISTING BUILDINGS
    • E04G23/00—Working measures on existing buildings
    • E04G23/02—Repairing, e.g. filling cracks; Restoring; Altering; Enlarging
    • E04G23/0218—Increasing or restoring the load-bearing capacity of building construction elements
    • E04G2023/0251—Increasing or restoring the load-bearing capacity of building construction elements by using fiber reinforced plastic elements
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N2291/00—Indexing codes associated with group G01N29/00
    • G01N2291/02—Indexing codes associated with the analysed material
    • G01N2291/023—Solids
    • G01N2291/0232—Glass, ceramics, concrete or stone

Landscapes

  • Engineering & Computer Science (AREA)
  • Architecture (AREA)
  • Chemical & Material Sciences (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Structural Engineering (AREA)
  • Civil Engineering (AREA)
  • General Health & Medical Sciences (AREA)
  • General Physics & Mathematics (AREA)
  • Immunology (AREA)
  • Pathology (AREA)
  • Health & Medical Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Biochemistry (AREA)
  • Analytical Chemistry (AREA)
  • Acoustics & Sound (AREA)
  • Investigating Or Analyzing Materials By The Use Of Ultrasonic Waves (AREA)

Abstract

The invention discloses a test method for calibrating the active restraining force and ultrasonic wave of an FRP reinforced concrete column. According to the stress characteristic of the FRP reinforced concrete column, the self-locking type prestress tensioning device is used for controllably tensioning the FRP, meanwhile, a sound wave transmitting sensor is arranged inside the confined concrete, a sound wave receiving device is arranged on the outer side of the confined concrete, and the ultrasonic testing signal transmitted through the core concrete inside the confined concrete column is continuously received in the tensioning process. And establishing a corresponding function relation according to the known tension and the acoustic-stress sensitivity parameter measured in the tensioning process, thereby achieving the purpose of calibrating the variation of the acoustic-stress sensitivity parameter. The testing device is simple, quick to operate and reliable in analysis, and after calibration is completed, the active restraining force provided by the FRP on the core concrete in the whole loading process of the FRP reinforced concrete can be measured by an ultrasonic method.

Description

Test method for calibrating active restraining force and ultrasonic wave of FRP (fiber reinforced Plastic) reinforced concrete column
Technical Field
The invention relates to the technical field of ultrasonic nondestructive testing, in particular to a test method for calibrating the active restraining force and ultrasonic waves of an FRP reinforced concrete column.
Background
The Fiber Reinforced Plastic (FRP) reinforced concrete column is a novel combined column formed by wrapping FRP outside a common concrete column, and because the internal concrete is in a three-dimensional stress state under the constraint action of external FRP, the FRP reinforced concrete column has very high bearing capacity and better axial ductility, and meanwhile, the external FRP can protect the internal concrete to enable the FRP reinforced concrete column to have better durability, so the FRP reinforced concrete column is gradually applied to engineering restoration and reinforcement.
At present, no test device can accurately measure the size of the restraint effect of the hoop and the distribution condition along the section. Because the active constraint force provided by the FRP exists on the interface between the FRP and the concrete, a measuring device of common stress strain cannot be installed, and a measuring element can be prevented from being arranged at the contact position of the interface by adopting an ultrasonic mode, the size of the constraint action of the concrete can be reflected according to the received ultrasonic sound-stress sensitivity parameter change by adopting ultrasonic detection, so that the method is a feasible method. However, a test method capable of calibrating the corresponding relation between the active restraining force of the FRP reinforced concrete column and the change of the ultrasonic sound-stress sensitivity parameter is lacked at present.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide a test method for calibrating the active restraining force and ultrasonic wave of an FRP reinforced concrete column.
In order to achieve the purpose, the test method for calibrating the active restraining force and the ultrasonic wave of the FRP reinforced concrete column is characterized by comprising the following steps: the method comprises the steps of performing controllable tensioning on FRP (fiber reinforced plastic) by using a self-locking prestress tensioning device, simultaneously arranging a sound wave transmitting sensor inside a concrete column structure, arranging a sound wave receiving device on the outer surface of the FRP of the concrete column structure, and continuously receiving an ultrasonic testing signal which is internally transmitted through core concrete in the concrete column in the tensioning process; establishing a corresponding function relation according to the known tension and the acoustic-stress sensitivity parameter measured in the tensioning process, and calibrating the variation of the acoustic-stress sensitivity parameter; comprises the following steps:
(1) embedding an ultrasonic emission sensor, wherein the ultrasonic emission sensor is embedded in the center position of a section to be measured in the concrete column before core concrete is poured;
(2) the FRP is tensioned through the self-locking type prestress device, and meanwhile, an axial pressure is applied to the column, wherein the magnitude of the axial pressure is 0.6Nu，NuTo it isBearing capacity; the FRP is tensioned by adopting graded loading, known prestress is applied to the FRP, and the ultimate tensile strain of each grade is increased by 5 percent until the FRP reinforced concrete column is damaged; carrying out ultrasonic testing after the dial pointer of the tension sensor is stable in each stage of load holding time of about 2-3 min;
(3) performing ultrasonic testing, namely enabling an ultrasonic receiving device to be in good contact with the outer surface of the FRP reinforced concrete column through an ultrasonic coupling agent; during testing, the ultrasonic transmitting sensor transmits ultrasonic waves to the FRP reinforced concrete column to be tested, the ultrasonic receiving device receives the ultrasonic waves transmitted through core concrete in the FRP reinforced concrete column, and simultaneously, a beam curve corresponding to the transmitted ultrasonic waves is recorded;
(4) the computer analyzes and processes the ultrasonic testing signal received by the ultrasonic receiving sensor, and the constraint action of the FRP on the core concrete can be considered as uniform according to the mechanical property of the FRP constraint concrete column, and the size sigma of the core concrete can be calculated according to the following formula:
Figure BDA0002240824500000021
in the formula: efrp，frpThe elastic modulus of FRP and the strain that occurs; t is the thickness of FRP, d is the diameter of the concrete column; therefore, controllable constraint force is obtained through controllable FRP tensioning; and the received ultrasonic signals are processed in a wavelet mode, and a weighted frequency domain spectral area parameter is calculated by using a formula (2):
Figure BDA0002240824500000031
in the formula: sjIs 2 ndjThe variation amplitude value of the frequency domain spectral area of the wavelet component under the scale; and (3) analyzing spectral area parameters under different constraint forces and actions thereof by using fitting regression, and finding that the two approximately have the following functional relationship:
Figure BDA0002240824500000032
parameters A, B, C and D in the formula are related to the performance of the adopted concrete material and the fiber resin colloid, and the parameter values of the concrete with different aggregate sizes and different strength proportions and the fiber resin colloids with different proportions are different; and further constructing a functional relation between different active constraint forces and the corresponding acoustic-stress sensitivity parameters according to the correlation between the analyzed and processed ultrasonic acoustic-stress sensitivity parameters and the stress.
The working principle of the invention is as follows:
the invention adopts ultrasonic detection, and is a feasible method for reflecting the size of the restraint action of the core concrete according to the change of the sound-stress sensitivity parameter of the received ultrasonic. However, a test method for calibrating the corresponding relation between the magnitude of the active restraining force of the FRP reinforced concrete column and the change of the ultrasonic sound-stress sensitivity parameter is lacked at present. Based on the stress characteristic of the FRP reinforced concrete column, the invention utilizes the self-locking type prestress tensioning device to controllably tension the FRP, and simultaneously arranges a sound wave transmitting device inside the core concrete and arranges a sound wave receiving device outside the core concrete, thereby continuously receiving the ultrasonic wave which is transmitted through the core concrete inside the core concrete in the tensioning process. The self-locking type prestress tensioning device controllably tensions the FRP to provide the FRP with known prestress, the active constraint force of the FRP on core concrete can be calculated according to mechanics knowledge through the known prestress, meanwhile, a sound wave signal in the tensioning process is obtained through ultrasonic testing, and further, a function relation between different active constraint forces and corresponding sound-stress sensitivity parameters is built, so that the purpose of calibrating the change of the sound-stress sensitivity parameters is achieved.
The invention has the following advantages and beneficial effects:
compared with the prior art, the invention has the advantages that: the testing device is simple, quick to operate and reliable in analysis, and after calibration is completed, the active restraining force of the FRP on the core concrete in the whole loading process of the FRP reinforced concrete column can be measured by an ultrasonic method.
Drawings
FIG. 1 is a FRP prestress tension control schematic diagram corresponding to the test method for calibrating the active restraining force and the ultrasonic wave of the FRP reinforced concrete column of the invention;
FIG. 2 is a schematic structural cross-sectional view of the present invention for calibrating the active restraining force and ultrasonic wave of the FRP reinforced concrete column;
fig. 3 is a schematic structural diagram of a test device for calibrating an active restraining force and ultrasonic waves of an FRP reinforced concrete column according to an embodiment of the present invention.
In the figure: 1. the device comprises an FRP reinforced concrete column, 2, a self-locking type prestress tensioning device anchor head, 3, a self-locking type prestress tensioning device nut, 4, a self-locking type prestress tensioning device screw, 5, an ultrasonic transmitting sensor, 6, an ultrasonic receiving device, 7 and a computer.
Detailed Description
The following describes embodiments of the present invention with reference to the accompanying drawings.
The invention provides a test method for calibrating the active restraining force and ultrasonic wave of a concrete-filled steel tubular column. The calibration method comprises the FRP reinforced concrete column to be tested 1, the self-locking prestress device (comprising a self-locking prestress tensioning device anchor head 2, a self-locking prestress tensioning device nut 3 and a self-locking prestress tensioning device screw rod 4), an ultrasonic emission sensor 5, a signal amplification device, an ultrasonic receiving device 6 and a computer 7. The FRP reinforced concrete column 1 to be tested is preferably formed by pouring self-compacting concrete, the ultrasonic transmitting sensor 5 is embedded in the center of the middle section of the column before core concrete is poured, the ultrasonic receiving device 6 is clung to the outer surface of FRP (fiber reinforced Plastic) of the middle section of the FRP reinforced concrete column 1 to be tested, and preferably, the ultrasonic transmitting sensor 5 and the ultrasonic receiving device 6 are in synchronous working state; further, the ultrasonic receiving device 6 is also connected with a computer, and the computer is used for analyzing and processing the ultrasonic testing signal received by the ultrasonic receiving device 6; the self-locking prestress device 6 controllably stretches the FRP, applies a known prestress to the FRP, can calculate the active constraint force of the FRP on core concrete according to mechanics knowledge through the known prestress, obtains a sound wave signal in the stretching process through ultrasonic testing, and further constructs the relation between the corresponding sound-stress sensitivity parameters and the radial constraint force under different prestress, thereby achieving the purpose of calibration.
Specifically, the method comprises the following steps:
(1) embedding an ultrasonic transmitting sensor 5, wherein the ultrasonic transmitting sensor 5 is embedded in the center position of a cross section to be measured in the column before core concrete is poured;
(2) tensioning FRP by using a self-locking prestress device (comprising a self-locking prestress tensioning device anchor head 2, a self-locking prestress tensioning device nut 3 and a self-locking prestress tensioning device screw rod 4), and simultaneously applying an axial pressure to the column, wherein the magnitude of the axial pressure is 0.6Nu(NuIts bearing capacity). The FRP is tensioned by adopting graded loading, known prestress is applied to the FRP, and the ultimate tensile strain of each grade is increased by 5 percent until the FRP reinforced concrete column 1 is damaged; and (4) carrying out ultrasonic testing after the dial pointer of the tension sensor is stable in each stage of load holding time of about 2-3 min.
(3) And (4) ultrasonic testing, namely, enabling the ultrasonic receiving device 6 to be in good contact with the outer surface of the FRP through an ultrasonic couplant. During testing, the ultrasonic transmitter 5 transmits ultrasonic waves to the FRP reinforced concrete column 1 to be tested, the ultrasonic receiving device 6 receives the ultrasonic waves which penetrate through the inner core concrete, and simultaneously, a beam curve corresponding to the transmitted ultrasonic waves is recorded.
(4) According to the mechanical properties of FRP constraint concrete cylinder, the constraint action of FRP on the core concrete can be considered as uniform, and the size sigma can be calculated according to the following formula:
Figure BDA0002240824500000061
in the formula: efrp，frpThe elastic modulus of the FRP and the strain that occurs. t is the thickness of the FRP, d is the diameter of the concrete column. Thus, a controlled restraining force is achieved by controlled FRP tensioning. The received ultrasonic signals are processed in a wavelet mode, and a weighted frequency domain spectral area parameter is calculated by using a formula (2)
Figure BDA0002240824500000062
In the formula: sjIs 2 ndjMagnitude of variation of the frequency domain spectral area of the wavelet component at scale. And (3) analyzing spectral area parameters under different constraint forces and actions thereof by using fitting regression, and finding that the two approximately have the following functional relationship:
Figure BDA0002240824500000063
the parameters A, B, C and D in the formula are related to the performance of the adopted concrete material and the fiber resin colloid, and the parameter values of the concrete with different aggregate sizes, different strength proportions and the like and the fiber resin colloid with different proportions are different. The test of a plurality of FRP (fiber reinforced Plastic) restrained concrete columns shows that the FRP restrained concrete columns approximately accord with the functional relationship, and the ratio R of the regression sum of squares and the total dispersion sum of squares2The model fitting goodness is higher within the range of 0.815-0.912. Therefore, the functional relation between the corresponding sound-stress sensitivity parameter and the constraint force under different FRP tensioning stresses can be obtained.
Although the embodiments of the present invention have been described with reference to the accompanying drawings, it is not intended to limit the scope of the present invention, and it should be understood by those skilled in the art that various modifications and variations can be made without inventive efforts by those skilled in the art based on the technical solution of the present invention.

Claims (1)

1. A test method for calibrating active restraining force and ultrasonic wave of an FRP reinforced concrete column is characterized by comprising the following steps: the method comprises the steps of performing controllable tensioning on FRP (fiber reinforced plastic) by using a self-locking prestress tensioning device, simultaneously arranging a sound wave transmitting sensor inside a concrete column structure, arranging a sound wave receiving device on the outer surface of the FRP of the concrete column structure, and continuously receiving an ultrasonic testing signal which is internally transmitted through core concrete in the concrete column in the tensioning process; establishing a corresponding function relation according to the known tension and the acoustic-stress sensitivity parameter measured in the tensioning process, and calibrating the variation of the acoustic-stress sensitivity parameter; comprises the following steps:
(1) embedding an ultrasonic emission sensor, wherein the ultrasonic emission sensor is embedded in the center position of a section to be measured in the concrete column before core concrete is poured;
(2) the FRP is tensioned through the self-locking type prestress device, and meanwhile, an axial pressure is applied to the column, wherein the magnitude of the axial pressure is 0.6Nu，NuFor its load-bearing capacity; the FRP is tensioned by adopting graded loading, known prestress is applied to the FRP, and the ultimate tensile strain of each grade is increased by 5 percent until the FRP reinforced concrete column is damaged; carrying out ultrasonic testing after the dial pointer of the tension sensor is stable within 2-3 min for each stage of load holding time;
(3) performing ultrasonic testing, namely enabling an ultrasonic receiving device to be in good contact with the outer surface of the FRP reinforced concrete column through an ultrasonic coupling agent; during testing, the ultrasonic transmitting sensor transmits ultrasonic waves to the FRP reinforced concrete column to be tested, the ultrasonic receiving device receives the ultrasonic waves transmitted through core concrete in the FRP reinforced concrete column, and simultaneously, a beam curve corresponding to the transmitted ultrasonic waves is recorded;
(4) the computer analyzes and processes the ultrasonic testing signal received by the ultrasonic receiving sensor, and the constraint action of the FRP on the core concrete can be considered as uniform according to the mechanical property of the FRP constraint concrete column, and the size sigma of the core concrete can be calculated according to the following formula:
Figure FDA0002614770510000011
in the formula: efrp，frpThe elastic modulus of FRP and the strain that occurs; t is the thickness of FRP, d is the diameter of the concrete column; therefore, controllable constraint force is obtained through controllable FRP tensioning; and the received ultrasonic signals are processed in a wavelet mode, and a weighted frequency domain spectral area parameter is calculated by using a formula (2):
Figure FDA0002614770510000021
in the formula: sjIs 2 ndjThe variation amplitude value of the frequency domain spectral area of the wavelet component under the scale; and (3) analyzing spectral area parameters under different constraint forces and actions thereof by using fitting regression, and finding that the two approximately have the following functional relationship:
Figure FDA0002614770510000022
parameters A, B, C and D in the formula are related to the performance of the adopted concrete material and the fiber resin colloid, and the parameter values of the concrete with different aggregate sizes and different strength proportions and the fiber resin colloids with different proportions are different; and further constructing a functional relation between different active constraint forces and the corresponding acoustic-stress sensitivity parameters according to the correlation between the analyzed and processed ultrasonic acoustic-stress sensitivity parameters and the stress.
CN201910999443.9A 2019-10-21 2019-10-21 Test method for calibrating active restraining force and ultrasonic wave of FRP (fiber reinforced Plastic) reinforced concrete column Active CN110988117B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201910999443.9A CN110988117B (en) 2019-10-21 2019-10-21 Test method for calibrating active restraining force and ultrasonic wave of FRP (fiber reinforced Plastic) reinforced concrete column

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201910999443.9A CN110988117B (en) 2019-10-21 2019-10-21 Test method for calibrating active restraining force and ultrasonic wave of FRP (fiber reinforced Plastic) reinforced concrete column

Publications (2)

Publication Number Publication Date
CN110988117A CN110988117A (en) 2020-04-10
CN110988117B true CN110988117B (en) 2020-10-13

Family

ID=70082173

Family Applications (1)

Application Number Title Priority Date Filing Date
CN201910999443.9A Active CN110988117B (en) 2019-10-21 2019-10-21 Test method for calibrating active restraining force and ultrasonic wave of FRP (fiber reinforced Plastic) reinforced concrete column

Country Status (1)

Country Link
CN (1) CN110988117B (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113866277A (en) * 2021-09-22 2021-12-31 合诚工程咨询集团股份有限公司 Nondestructive testing method for pile forming quality of large-diameter secant pile

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2002071650A (en) * 2000-08-31 2002-03-12 Kansai X Sen Kk Method of ultrasonic flaw detection for hollow concrete column
CN101845814A (en) * 2010-05-18 2010-09-29 金文成 Composite material intelligent anchorage with self-monitoring function and preparation method thereof
CN103149094A (en) * 2013-03-05 2013-06-12 华北水利水电学院 Measuring method and device for tensile creep of early-age concrete
CN103743820A (en) * 2014-02-28 2014-04-23 江苏理工学院 Concrete column quality supersonic detection device based on universe transition time index and detection method thereof
JP5723504B2 (en) * 2011-01-28 2015-05-27 株式会社ダイヤコンサルタント Nondestructive diagnosis method for hollow concrete columns
CN106248737A (en) * 2016-07-19 2016-12-21 四川大学 The testing method of short column is reinforced for FRP
CN108729477A (en) * 2018-05-28 2018-11-02 青岛理工大学 A kind of analysis method of the GFRP anti-float anchor rods body of rod-anchoring body interface frictional resistance and binding force

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2002071650A (en) * 2000-08-31 2002-03-12 Kansai X Sen Kk Method of ultrasonic flaw detection for hollow concrete column
CN101845814A (en) * 2010-05-18 2010-09-29 金文成 Composite material intelligent anchorage with self-monitoring function and preparation method thereof
JP5723504B2 (en) * 2011-01-28 2015-05-27 株式会社ダイヤコンサルタント Nondestructive diagnosis method for hollow concrete columns
CN103149094A (en) * 2013-03-05 2013-06-12 华北水利水电学院 Measuring method and device for tensile creep of early-age concrete
CN103743820A (en) * 2014-02-28 2014-04-23 江苏理工学院 Concrete column quality supersonic detection device based on universe transition time index and detection method thereof
CN106248737A (en) * 2016-07-19 2016-12-21 四川大学 The testing method of short column is reinforced for FRP
CN108729477A (en) * 2018-05-28 2018-11-02 青岛理工大学 A kind of analysis method of the GFRP anti-float anchor rods body of rod-anchoring body interface frictional resistance and binding force

Also Published As

Publication number Publication date
CN110988117A (en) 2020-04-10

Similar Documents

Publication Publication Date Title
Chaki et al. Guided ultrasonic waves for non-destructive monitoring of the stress levels in prestressed steel strands
CN107687973B (en) Method for testing dynamic point load strength of rock material by using Hopkinson pressure bar
Shah et al. Effectiveness of nonlinear ultrasonic and acoustic emission evaluation of concrete with distributed damages
CN111678630B (en) Steel strand uniaxial stress detection method based on ultrasonic guided wave stress sensitivity analysis
Shah et al. Nondestructive evaluation of damaged concrete using nonlinear ultrasonics
Rizzo Ultrasonic wave propagation in progressively loaded multi-wire strands
US7614303B2 (en) Device for measuring bulk stress via insonification and method of use therefor
CN110987611B (en) Method for nondestructively measuring active and passive restraint force of FRP (fiber reinforced Plastic) restraint concrete column based on ultrasonic waves
Shah et al. Nonlinear ultrasonic investigation of concrete damaged under uniaxial compression step loading
CN107300432B (en) Method and device for realizing field self-adaptive cable force measurement
Kocherla et al. Embedded PZT sensors for monitoring formation and crack opening in concrete structures
Sun et al. Application of low-profile piezoceramic transducers for health monitoring of concrete structures
CN110988117B (en) Test method for calibrating active restraining force and ultrasonic wave of FRP (fiber reinforced Plastic) reinforced concrete column
CN111208207A (en) Bolt stress detection method
Castellano et al. Monitoring applied and residual stress in materials and structures by non-destructive acoustoelastic techniques
Fursa et al. Using electric response to mechanical impact for evaluating the durability of the GFRP-concrete bond during the freeze-thaw process
CN110907076B (en) Method for detecting uniform hoop restraining force of circular steel tube concrete column in real time by ultrasonic waves
Rizzo et al. Effect of frequency on the acoustoelastic response of steel bars
CN211783988U (en) Bolt axial stress testing device based on ultrasonic measurement
CN108152127B (en) Working stress monitoring device and method for concrete structure
CN114002327B (en) Method for detecting integrity degree of steel strand
Kim et al. Application of nonlinear ultrasonic method for monitoring of stress state in concrete
CN110907629B (en) Test method for calibrating constraint force and ultrasonic wave of concrete filled steel tubular column
JP2000206017A (en) Estimation method for strength of concrete in structure
Wiciak et al. Wave propagation in glass fibre-reinforced polymer (GFRP) bars subjected to progressive damage—Experimental and numerical results

Legal Events

Date Code Title Description
PB01 Publication
PB01 Publication
SE01 Entry into force of request for substantive examination
SE01 Entry into force of request for substantive examination
GR01 Patent grant
GR01 Patent grant