CN104931364A - Reinforced concrete structure fatigue test method and device based on piezomagnetic effect - Google Patents
Reinforced concrete structure fatigue test method and device based on piezomagnetic effect Download PDFInfo
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Abstract
The invention relates to the field of research on basic performance of reinforced concrete structures in civil engineering, in particular to a reinforced concrete structure fatigue test method and device based on a piezomagnetic effect. The crack initiation and propagation stage can be clearly defined by testing the magnetic field intensity of a reinforced concrete structure, the fatigue damage process, especially the later rapid degradation process can be grasped, and the fatigue damage form of the structure can be estimated.
Description
Technical field
The present invention relates to reinforced concrete structure key property research field in civil engineering work, be specifically related to a kind of reinforced concrete structure method for testing fatigue based on piezomagnetic effect and device.
Background technology
As high-rise, large span spatial structure, bridge, sleeper, crane girder, airfield runway, ocean platform and nuclear reactor safety shell etc. all exist fatigue problem in field of civil engineering, particularly along with the application of high-strength concrete and high tensile reinforcement, make the impact of the fatigue of reinforced concrete structure on its security and permanance more crucial.Reinforced concrete structure under arms in process fatigue damage constantly accumulate, paroxysmal brittle rupture can be produced when reaching a certain limit value, there is no obvious omen, easily causing heavy losses.
Because the system of reinforced concrete structure is complicated, its fatigue study needs a large amount of tests to support, and it is tired by load, the factor impacts such as material composition and environment, damage process is very complicated, the macroscopic physical quantity that conventional test methodologies measurement obtains is as strain, amount of deflection, rigidity, its During Fatigue Damage Process cannot effectively be reflected in cracks etc., simultaneously, the Fatigue Damage Process of reinforced concrete structure also fails to be well solved, a kind of method of effective monitoring reinforced concrete structure Fatigue Damage States is not had: (1) early stage of fatigue yet, owing to there is no obvious microcosmic and macroscopic physical quantity change, conventional means is difficult to use, clearly cannot define crack initiation and Crack Extension stage, (2) carry out fatigue process analysis based on traditional stress-strain hysteresis loop and cannot disclose Fatigue Damage Process from microcosmic angle on the one hand, on the other hand hysteresis loop is dull, holds the process difficult of Fatigue Damage Evolution process especially later stage rapid degradation, (3) under reciprocating load, reinforced concrete structure stress is very complicated, adopts every damage criterions such as strain, rigidity, fracture width to be also difficult to disclose the Fatigue Damage Process of its microcosmic, (4) present stage reinforced concrete structure life-span prediction method be mostly based upon self test basis on, lack for predicted fatigue life the failure mode that theoretical foundation (5) prior art can not estimate reinforced beam.Therefore, need a kind of new method for testing fatigue of research and device, Magnetic testi technology has been widely used in the field such as medical treatment, military affairs, wherein, utilize the mechanical behavior of piezomagnetic effect research metal material and During Fatigue Damage Process all very effective, can be applicable to reinforced concrete structure fatigue study.
Summary of the invention
Technical matters to be solved by this invention is: provide a kind of and clearly can define the Fatigue crack initiation stage, can hold During Fatigue Damage Process especially later stage rapid degradation process and can estimate the reinforced concrete structure method for testing fatigue based on piezomagnetic effect and the device of structural fatigue failure mode.
The technical solution adopted in the present invention is: a kind of reinforced concrete structure method for testing fatigue based on piezomagnetic effect, and it comprises the following steps:
(1), the reinforced beam tested is prepared, and Fundamentals of Measurement data;
(2), by proving installation be fixed on the reinforced beam of test, and mainly comprise the following steps:
A, two pairs of blind holes are set on the span centre position of reinforced beam;
B, by two band magnetic probes bracing or strutting arrangement be separately fixed in two pairs of blind holes;
C, by be arranged on bracing or strutting arrangement magnetic probe bearing adjustment magnetic probe height, probing head is alignd with the center line of the reinforcing bar in reinforced beam;
D, by magnetic probe bearing adjustment magnetic probe towards, making one of them magnetic probe towards vertical with reinforcing bar, for measuring the normal direction magnetic field of reinforcing bar, being called the first magnetic probe; Another magnetic probe towards with parallel reinforced steel bar, for measuring the tangential magnetic field of reinforcing bar, be called the second magnetic probe;
E, by bracing or strutting arrangement adjustment magnetic probe and reinforced beam surface between distance, make the distance between magnetic probe and reinforced beam surface be 8-12mm;
(3), by fatigue tester provide test force to the reinforced beam securing proving installation, described test force is increase the cyclic force then reduced gradually gradually;
(4), collecting test data, process test data and obtain conclusion:
1., after reinforced beam is subject to the test force from pulse fatigue testing machine, magnetic field can change, and magnetic probe gathers magnetic field intensity signal;
2., according to the test force of the magnetic field intensity that collects and fatigue tester, form one with fatigue tester test force for horizontal ordinate and the first curve that magnetic field intensity that magnetic probe records is ordinate, form the second curve that is horizontal ordinate with time and magnetic field intensity that magnetic probe records is ordinate simultaneously;
3., when test force is at first circulation time, along with the increase of test force, magnetic field can change, when test force is increased to a certain degree, magnetic field in first curve can produce a sudden change, now then represents that reinforced beam creates Article 1 crack under test force effect;
4., test force can form second curve at each circulation time, the crest field strength value of each second curve deducts trough field strength value and can obtain a changes of magnetic field amplitude, the changes of magnetic field amplitude recorded by the first magnetic probe in each circulation is all averaged with the changes of magnetic field amplitude recorded by the second magnetic probe, if the mean value of the changes of magnetic field amplitude that the first magnetic probe records is greater than the mean value of the changes of magnetic field amplitude that the second magnetic probe records, then can judge that reinforced beam shear failure can occur; If the mean value of the changes of magnetic field amplitude that the first magnetic probe records is less than the mean value of the changes of magnetic field amplitude that the second magnetic probe records, then can judge that reinforced beam can bend destruction;
5. the area of the first curve, is calculated, then the 3rd curve is formed using the cycle index of test force as horizontal ordinate using this area as ordinate, increase with cycle index, then area is less, when occur in the 3rd curve second time area reduce speed accelerate time, represent that the time that number of times that this test force circulate is corresponding is the time that reinforced beam is about to damage.
A kind of proving installation as claimed in claim 1, it comprises data collector and data processing equipment, described data collector comprising magnetic probe, being fixed on the bracing or strutting arrangement of the reinforced beam of test, being arranged on bracing or strutting arrangement for regulating the magnetic probe bearing of magnetic probe position, described data processing equipment comprises computing machine, and described magnetic probe is connected with Computer signal.
Adopt above method and proving installation compared with prior art, the present invention has the following advantages: (1) method for testing fatigue based on piezomagnetic effect provided by the invention is realized by the method in indirect inspection Rebar magnetic field; (2) test force that the magnetic field that can record according to magnetic probe and test machine provide obtains the process that Article 1 crackle produces, and then knows the Fatigue crack initiation stage; (3) can to change with the magnetic field amplitude in method phase magnetic field according to tangential magnetic field and estimate the final failure mode of reinforced beam structural fatigue; (4) can hold During Fatigue Damage Process especially later stage rapid degradation process according to the area change obtaining first curve in test force and magnetic field after each test force circulation, can obtain making early warning before reinforced beam is about to damage like this; And adopt this proving installation (5), structure is simple, easy for installation, and magnetic probe position adjustments is more convenient, and then makes test effect better.
Accompanying drawing explanation
Fig. 1 is the structural representation of the reinforced concrete structure fatigue test device that the present invention is based on piezomagnetic effect.
Fig. 2 is the structural representation that the reinforced concrete structure fatigue test device that the present invention is based on piezomagnetic effect is installed on the reinforced beam of test.
Fig. 3 is the magnetic field intensity that records in the first two circulation with the first magnetic probe in numbering FB-B1 beam in the reinforced concrete structure method for testing fatigue that the present invention is based on piezomagnetic effect for ordinate is the first curve map that horizontal ordinate obtains with test force.
Fig. 4 is the magnetic field intensity that records in the first two circulation with the second magnetic probe in numbering FB-B1 beam in the reinforced concrete structure method for testing fatigue that the present invention is based on piezomagnetic effect for ordinate is the first curve map that horizontal ordinate obtains with test force.
Fig. 5 is the magnetic field intensity that records in multiple different circulation with the second magnetic probe in numbering FB-B4 beam in the reinforced concrete structure method for testing fatigue that the present invention is based on piezomagnetic effect for ordinate is the first different curve map that horizontal ordinate obtains with test force.
Fig. 6 is that the join end to end area of the closed figure formed of the first curve recorded in each cycle using the second magnetic probe in numbering FB-B4 beam in the reinforced concrete structure method for testing fatigue that the present invention is based on piezomagnetic effect forms the 3rd curve map as ordinate using the cycle index of test force as horizontal ordinate.
As shown in the figure: 1, magnetic probe; 2, reinforced beam; 3, bracing or strutting arrangement; 4, magnetic probe bearing.
Embodiment
Below in conjunction with accompanying drawing and embodiment, the present invention is described further, but the present invention is not limited only to following embodiment.
Ferromagnetic material and ferrimagnetic material are due to the change of magnetized state, and its length and volume all small change will occur, and this phenomenon is called magnetostriction, and piezomagnetic effect is magnetostrictive back wash effect.According to Maxwellian relation, recurrence relation and Curie's law, the ferromagnetic material of unit volume has following relation:
In formula (1), M is magnetic moment; P is compelling force; H is magnetic field intensity; T is thermodynamic temperature; V is volume.Formula (1) left side is magnetostriction, and the right is piezomagnetic effect.
Outside under effect of stress, total free energy of ferromagnet magnetocrystalline is:
E＝E
k+E
ms+E
el+E
σ(2)
In formula (2), E is free energy, E
kfor anisotropy energy, E
msfor magnetoelastic energy, E
elfor elasticity energy, E
σfor stress energy.The External Force Acting of ferromagnetic material causes the increase of stress energy, according to maximum energy criterion, magnetoelastic energy and elasticity can also can change to keep total free energy minimum, the existence of stress in other words forces displacement and the rotation of domain structure originally, balance under state of nature is destroyed, and thereby produces pressure magnetic signal.
Mechanism piezomagnetic effect being applied to fatigue damage research is: under alternate load effect, microplasticity process will cause the gliding dislocations of material internal structure, thus change the texture of material, space, inclusions and other flaws, this physical change can change again the arrangement of the structure of ferromagnetic material coexisted with it conversely, thus affects the magnetic field intensity that material shows, and presses the evolution process in magnetic field just can record its During Fatigue Damage Process by measuring around ferromagnetism test specimen.The physical principle of this method is the power magneto-mechanical effect of reinforcing bar, namely reinforced concrete is under load action, reinforcement stresses change, reinforced concrete interface performance (bond-slip etc.) change, crack developing etc. all cause reinforcement stresses distribution again, in fatigue process reinforcing steel bar bear state and interface performance more complicated, field signal around reinforcing bar can corresponding change, can be known faulted condition and the Interface Damage of Reinforced Concrete state of reinforcement in concrete by monitoring changes of magnetic field.
Ferromagnetic magnetic history comprises irreversible magnetization M
irrwith reversible magnetization M
rev, the magnetization of material also with anhysteretic magnetization M
anrelevant, external force is that remanent magnetization is constantly to M on magnetized impact
anclose process, this becomes close to theoretical.
M＝M
rev+M
irr(3)
M
rev＝c(M
an-M
irr) (4)
In its Chinese style (3) formula (4), M is the magnetization, M
irrfor irreversible magnetization intensity, M
revfor reversible magnetization intensity, M
anfor the anhysteretic magnetization, c is constant, the elasticity of reflection domain wall.
Proving installation of the present invention comprises data collector and data processing equipment, described data collector comprising magnetic probe, being fixed on the bracing or strutting arrangement of the reinforced beam of test, being arranged on bracing or strutting arrangement for regulating the magnetic probe bearing of magnetic probe position, described data processing equipment comprises computing machine, and described magnetic probe is connected with Computer signal.Described bracing or strutting arrangement and magnetic probe bearing are aluminum material and make.And data collector also comprises data collecting card, single-chip microcomputer and storage card.
Method of testing of the present invention mainly comprises the following steps:
(1), the reinforced beam tested is prepared, and Fundamentals of Measurement data;
Choose the hot-rolled ribbed HRB400 reinforcing bar of Jiangsu Shagang Group Co., Ltd., component list is as following table one:
Table one
Reinforcing bar basic mechanical performance is as following table two:
Table two
Concrete matched when mechanical property as following table three:
Table three
Reinforced beam, beam is of a size of 150mm × 200mm × 1500mm, and protective layer thickness is taken as 15mm, simple bending section 500mm, clear span 1200mm, and vertical muscle adopts 2C14, and bearing rod adopts 2A10, and stirrup adopts the two limb hoop of A8.
The present invention has prepared four test reinforced beams, and numbering is respectively FB-B1, FB-B2, FB-B3, FB-B4, and these four reinforced beams are the same, and the Ultimate Bearing Capacity of the reinforced beam of test is M
u, for FB-B1 beam and FB-B2 beam, full test power M
maxfor 0.75*M
u, minimum test force M
minfor 0.1*M
u, for FB-B3 beam and FB-B4 beam, full test power M
maxfor 0.6*M
u, minimum test force M
minfor 0.1*M
u.As shown in following table four:
Table four
(2), by proving installation be fixed on the reinforced beam of test, and mainly comprise the following steps:
A, two pairs of blind holes (shallow hole) are set on the span centre position of reinforced beam; Namely the both sides, by-level direction of beam upper and lower end face arrange a pair blind hole respectively; The degree of depth of described blind hole is 1mm, so can not affect reinforced beam stress performance, the diameter of bolt of blind hole diameter and bracing or strutting arrangement adapts to.
B, by two band magnetic probes bracing or strutting arrangement be separately fixed on two pairs of blind holes (shallow hole);
C, by be arranged on bracing or strutting arrangement magnetic probe bearing adjustment magnetic probe height, probing head is alignd with the center line of the reinforcing bar in reinforced beam;
D, by magnetic probe bearing adjustment magnetic probe towards, making one of them magnetic probe towards vertical with reinforcing bar, for measuring the normal direction magnetic field of reinforcing bar, being called the first magnetic probe; Another magnetic probe towards with parallel reinforced steel bar, for measuring the tangential magnetic field of reinforcing bar, be called the second magnetic probe;
E, by bracing or strutting arrangement adjustment magnetic probe and reinforced beam surface between distance, make the distance between magnetic probe and reinforced beam surface be 8-12mm; The present invention is preferably 10mm;
(3), test force is provided by fatigue tester to the reinforced beam securing proving installation, described test force is increase the cyclic force then reduced gradually gradually, and the power that described test force is formed and the waveform of time can be sinusoidal wave or triangular wave; Testing fatigue testing machine used is PMW-800 pulse fatigue testing machine, and frequency acquisition is 200Hz;
(4), collecting test data, process test data and obtain conclusion:
As shown in Figure 3, Figure 4, for the curve obtained of numbering FB-B1 test reinforced beam, Fig. 3 horizontal ordinate is the test force of testing machine and ordinate is the magnetic field intensity that the first magnetic probe records, Fig. 4 horizontal ordinate is the test force of testing machine and ordinate is the magnetic field intensity that the second magnetic probe records, as can be seen from Fig. 3 and Fig. 4, at method phase magnetic field B
nwith tangent line magnetic field B
twhen producing sudden change, when namely curve rises suddenly, be the time that Article 1 crack produces;
In addition, show from Fig. 3 and Fig. 4, first time circulation creates very large irreversible magnetization, the test force of FB-B1 beam is offloaded to the normal direction of 0kN and tangential irreversible magnetization is respectively 87.6mG and 65.8mG, irreversible magnetization after second circulation terminates is respectively 92.5mG and 70.6mG, and increment is respectively 4.9mG and 4.8mG.According to close to theoretical, the ferromagnetic material under cyclic load will level off to desirable reversible magnetization state from irreversible magnetization state gradually, and irreversible magnetization part can reduce gradually, conforms to test result.
After first time, CYCLIC LOADING created very large irreversible magnetization, irreversible magnetic field can increase gradually along with cycle index and trend towards stationary value gradually, changes of magnetic field amplitude kept stable under cyclic load, as shown in Table 5, △ Bt is tangential magnetic field change amplitude, and △ Bn is method phase changes of magnetic field amplitude:
Table five
And the final failure mode of four test beams after test terminates is as shown in following table six:
Table six
In test, magnetic probe is arranged in the span centre simple bending section region of the most easy fracture of vertical muscle, and as can be seen from table five and table six, FB-B1 beam is tired shear failure, and △ Bt is less than △ Bn; FB-B2 ~ B4 beam is fail in bending, and vertical muscle fatigue break is in span centre region, and △ Bt is larger than △ Bn.So, in pressure magnet fatigue test process, the failure mode of test beam tentatively can be judged by amplitude that is tangential and the reversible pressure changes of magnetic field of normal direction.And we can find out from table five, the maximum △ Bt that FB-B1 beam obtains also is less than minimum △ Bn, namely also can show that any one △ Bt is all less than △ Bn; The minimum △ Bt that FB-B2 ~ B4 beam obtains also is greater than maximum △ Bn, namely also can show that any one △ Bt is all greater than △ Bn, so only need the tangential magnetic field of part and the change amplitude in method phase magnetic field also tentatively can judge the failure mode of test beam.
△B
n(n)＝B
nmax(n)-B
nmin(n) (5)
△B
t(n)＝B
tmax(n)-B
tmin(n) (6)
In its Chinese style (5) formula (6), n is cycle index, △ B
nn () is the change amplitude in the normal direction magnetic field that the first magnetic probe records, B
nmax (n) is the crest value in the method phase magnetic field that the first magnetic probe records; B
nmin (n) is the trough value in the method phase magnetic field that the first magnetic probe records.△ B
tn () is the tangential magnetic field change amplitude that the second magnetic probe records, B
tmax (n) is the crest value in the method phase magnetic field that the second magnetic probe records; B
tmin (n) is the trough value in the method phase magnetic field that the second magnetic probe records.
If △ is B
n(n) > △ B
tn (), then judge that reinforced beam finally can be sheared destruction;
If △ is B
n(n) < △ B
tn (), then judge that reinforced beam finally can be bent destruction.
Fatigue Process in Metals generally can be divided into three phases, and the fatigue of reinforced beam is generally also in three phase characteristics, and statistical result showed first and phase III account for about 10% of entire life respectively, and subordinate phase accounts for about 80%.As shown in Figure 5, the first curve during cycle index different from FB-B4 beam, namely with fatigue tester test force in a circulation for horizontal ordinate and magnetic field intensity that magnetic probe records are for ordinate, from figure, we obviously can find out that the change along with cycle index is large, and the join end to end area of the closed figure formed of the first curve is reducing gradually.As shown in Figure 6, for the area of the closed figure formed that joins end to end using the first curve forms the 3rd curve as ordinate using the cycle index of test force as horizontal ordinate, as can be seen from the figure three phases is had, first be that the area of the closed figure of first stage slowly declines, subordinate phase is that closed figure area tends to be steady, phase III is that the area of closed figure accelerates to decline, until level off to zero, similar to Fatigue Process in Metals, so can judge when occurring in the 3rd curve that secondary area reduces when speed is accelerated (when there is telomutation), then represent that time that number of times that this test force circulates is corresponding is in subordinate phase in reinforcing bar fatigue process and between the phase III, namely now reinforced beam is about to damage.
In formula (7), n is cycle index, and m is that the collection of each circulation is counted, B
ifor the magnetic field intensity of some correspondence collected for i-th time in each circulation, F
ifor the size of the power of some correspondence collected for i-th time in each circulation.
Claims (2)
1., based on a reinforced concrete structure method for testing fatigue for piezomagnetic effect, it is characterized in that, it comprises the following steps:
(1), the reinforced beam tested is prepared, and Fundamentals of Measurement data;
(2), by proving installation be fixed on the reinforced beam of test, and mainly comprise the following steps:
A, two pairs of blind holes are set on the span centre position of reinforced beam;
B, by two band magnetic probes bracing or strutting arrangement be separately fixed in two pairs of blind holes;
C, by be arranged on bracing or strutting arrangement magnetic probe bearing adjustment magnetic probe height, probing head is alignd with the center line of the reinforcing bar in reinforced beam;
D, by magnetic probe bearing adjustment magnetic probe towards, making one of them magnetic probe towards vertical with reinforcing bar, for measuring the normal direction magnetic field of reinforcing bar, being called the first magnetic probe; Another magnetic probe towards with parallel reinforced steel bar, for measuring the tangential magnetic field of reinforcing bar, be called the second magnetic probe;
E, by bracing or strutting arrangement adjustment magnetic probe and reinforced beam surface between distance, make the distance between magnetic probe and reinforced beam surface be 8-12mm;
(3), by fatigue tester provide test force to the reinforced beam securing proving installation, described test force is increase the cyclic force then reduced gradually gradually;
(4), collecting test data, process test data and obtain conclusion:
1., after reinforced beam is subject to the test force from fatigue tester, magnetic field can change, and magnetic probe gathers magnetic field intensity signal;
2., according to the test force of the magnetic field intensity that collects and fatigue tester, form one with fatigue tester test force for horizontal ordinate and the first curve that magnetic field intensity that magnetic probe records is ordinate, form the second curve that is horizontal ordinate with time and magnetic field intensity that magnetic probe records is ordinate simultaneously;
3., when test force is at first circulation time, along with the increase of test force, magnetic field can change, when test force is increased to a certain degree, magnetic field in first curve can produce a sudden change, now then represents that reinforced beam creates Article 1 crack under test force effect;
4., test force can form second curve at each circulation time, the crest field strength value of each second curve deducts trough field strength value and can obtain a changes of magnetic field amplitude, the changes of magnetic field amplitude recorded by the first magnetic probe in each circulation is all averaged with the changes of magnetic field amplitude recorded by the second magnetic probe, if the mean value of the changes of magnetic field amplitude that the first magnetic probe records is greater than the mean value of the changes of magnetic field amplitude that the second magnetic probe records, then can judge that reinforced beam shear failure can occur; If the mean value of the changes of magnetic field amplitude that the first magnetic probe records is less than the mean value of the changes of magnetic field amplitude that the second magnetic probe records, then can judge that reinforced beam can bend destruction;
5. the area of the first curve, is calculated, then the 3rd curve is formed using the cycle index of test force as horizontal ordinate using this area as ordinate, increase with cycle index, then the area of the first curve is less, when occur in the 3rd curve secondary area reduce speed accelerate time, represent that the time that number of times that this test force circulate is corresponding is the time that reinforced beam is about to damage.
2. a proving installation as claimed in claim 1, it is characterized in that: it comprises data collector and data processing equipment, described data collector comprises magnetic probe (1), the bracing or strutting arrangement (3) be fixed on the reinforced beam (2) of test, be arranged on bracing or strutting arrangement (3) for regulating the magnetic probe bearing (4) of magnetic probe (1) position, described data processing equipment comprises computing machine, and described magnetic probe (1) is connected with Computer signal.
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108978882A (en) * | 2018-08-21 | 2018-12-11 | 湘潭大学 | The method bonded between reinforcing steel bar and concrete based on steel fibre magnetic principle |
| CN109374452A (en) * | 2018-11-29 | 2019-02-22 | 中南大学 | A kind of prestressed concrete beam fatigue damage state characterization method and test device |
| CN110333007A (en) * | 2019-08-21 | 2019-10-15 | 重庆交通大学 | Reinforcement stresses monitoring method and monitoring device inside a kind of contactless bridge |
| CN110595919A (en) * | 2019-07-19 | 2019-12-20 | 江阴市建鑫金属有限公司 | Method for testing fatigue strength of steel bar welded mesh |
| CN110907270A (en) * | 2019-11-29 | 2020-03-24 | 浙江大学宁波理工学院 | Method for predicting fatigue life by using weak magnetic signal of ferromagnetic material |
| CN111368482A (en) * | 2020-04-01 | 2020-07-03 | 江西省水利科学研究院 | Simulation calculation method for interaction of steel bar and concrete under cyclic load |
| CN113405450A (en) * | 2021-06-01 | 2021-09-17 | 北京科技大学 | Rock concrete structural body stability monitoring and early warning method based on static magnetic field detection |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DD214030A1 (en) * | 1983-03-14 | 1984-09-26 | Univ Schiller Jena | PIEZOELECTRIC VIBRATOR |
| CN1063358A (en) * | 1991-01-18 | 1992-08-05 | 交通部重庆公路科学研究所 | Concrete absolute stress and elastic modulus detection method |
| CN101806577A (en) * | 2010-04-19 | 2010-08-18 | 何思龙 | Piezomagnetic turbine loss type reinforced concrete strain sensor and piezomagnetic stain meter thereof |
| CN101979997A (en) * | 2010-09-09 | 2011-02-23 | 北京理工大学 | System for testing damage to gradient composite under thermal/electric/magnetic/coupling action |
-
2015
- 2015-06-04 CN CN201510300212.6A patent/CN104931364B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DD214030A1 (en) * | 1983-03-14 | 1984-09-26 | Univ Schiller Jena | PIEZOELECTRIC VIBRATOR |
| CN1063358A (en) * | 1991-01-18 | 1992-08-05 | 交通部重庆公路科学研究所 | Concrete absolute stress and elastic modulus detection method |
| CN101806577A (en) * | 2010-04-19 | 2010-08-18 | 何思龙 | Piezomagnetic turbine loss type reinforced concrete strain sensor and piezomagnetic stain meter thereof |
| CN101979997A (en) * | 2010-09-09 | 2011-02-23 | 北京理工大学 | System for testing damage to gradient composite under thermal/electric/magnetic/coupling action |
Non-Patent Citations (2)
| Title |
|---|
| SHENG BAO: "two-parameter characterization of low cycle,hysteretic fatigue data", 《APPL PHYS & ENG》 * |
| 张功义: "混凝土受压过程磁场效应的试验研究", 《低温建筑技术》 * |
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| CN108978882A (en) * | 2018-08-21 | 2018-12-11 | 湘潭大学 | The method bonded between reinforcing steel bar and concrete based on steel fibre magnetic principle |
| CN109374452A (en) * | 2018-11-29 | 2019-02-22 | 中南大学 | A kind of prestressed concrete beam fatigue damage state characterization method and test device |
| CN109374452B (en) * | 2018-11-29 | 2023-11-10 | 中南大学 | Fatigue damage state characterization method and test device for prestressed concrete beam |
| CN110595919A (en) * | 2019-07-19 | 2019-12-20 | 江阴市建鑫金属有限公司 | Method for testing fatigue strength of steel bar welded mesh |
| CN110333007A (en) * | 2019-08-21 | 2019-10-15 | 重庆交通大学 | Reinforcement stresses monitoring method and monitoring device inside a kind of contactless bridge |
| CN110333007B (en) * | 2019-08-21 | 2021-11-16 | 重庆交通大学 | Non-contact bridge internal steel bar stress monitoring method and monitoring device |
| CN110907270A (en) * | 2019-11-29 | 2020-03-24 | 浙江大学宁波理工学院 | Method for predicting fatigue life by using weak magnetic signal of ferromagnetic material |
| CN110907270B (en) * | 2019-11-29 | 2022-05-27 | 浙大宁波理工学院 | Method for predicting fatigue life by using weak magnetic signal of ferromagnetic material |
| CN111368482A (en) * | 2020-04-01 | 2020-07-03 | 江西省水利科学研究院 | Simulation calculation method for interaction of steel bar and concrete under cyclic load |
| CN111368482B (en) * | 2020-04-01 | 2023-04-14 | 江西省水利科学研究院 | Simulation calculation method for interaction of steel bar and concrete under cyclic load |
| CN113405450A (en) * | 2021-06-01 | 2021-09-17 | 北京科技大学 | Rock concrete structural body stability monitoring and early warning method based on static magnetic field detection |
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| CN104931364B (en) | 2017-07-21 |
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