CN101793649B - Shear strength tester and method for testing shear strength - Google Patents
Shear strength tester and method for testing shear strength Download PDFInfo
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- CN101793649B CN101793649B CN 201010107968 CN201010107968A CN101793649B CN 101793649 B CN101793649 B CN 101793649B CN 201010107968 CN201010107968 CN 201010107968 CN 201010107968 A CN201010107968 A CN 201010107968A CN 101793649 B CN101793649 B CN 101793649B
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- 238000012795 verification Methods 0.000 claims description 11
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Abstract
The invention relates to a shear strength tester and a method for testing the shear strength, belonging to a special instrument and a method for testing the cementation shear strength between a strip and an original concrete structure when the concrete structure adopts a superficial layer to inlay high-strength strip or the high-strength strip is bonded on the surface in an engineering structure reinforcing and reforming project. The tester comprises a dynamometry link, a shear bracket and a scaling instrument. The end part of the shear bracket is tensioned by screwing a bolt of the dynamometry link; the strip after bonding is sheared by an actuating boot to cement with the concrete interface; the size of the shear force is tested by adopting a pull pressure sensor arranged inside the dynamometry link; and the maximum shear force is displayed by the scaling instrument. The anchoring length can be theoretically calculated by the shear strength tested by the device. The device has the advantages of simple structure, accurate actuation, simple and convenient operation, easy maintenance, and the like, does not need external power source and can be used under various environments.
Description
Technical field
The present invention relates to building structure checkout equipment and detection method, relate in particular to a kind of shear strength tester and method for testing shear strength of testing the bond shear strength between lath and the concrete.
Background technology
In the engineering structure strengthening reconstruction project, the technical measures that adopt shallow-layer build-in or surface to paste lath are arranged.The mode of such measures by pasting brought into play the good tensile strength of lath, can improve the bearing capacity of xoncrete structure largely.The pulling force that lath provides is delivered on the xoncrete structure by the cohesive action of structure glue, has bigger shear stress between lath and the structure glue, between structure glue and the concrete interface.The key of reinforcing is exactly that can the shear resistance of lath and former xoncrete structure meet design requirement.In the standard such as " concrete structure reinforcement design specifications " GB 50367-2006, paste high-strength lath for the surface and just infer shear resistance at present, belong to indirect means, have certain error by the check of just drawing cohesive strength; For shallow-layer build-in lath, then there are not relevant detection equipment and means.Do not have the shear resistance parameter between lath and the concrete, just can't draw the theoretical anchorage length of lath in concrete, and the anchorage length of at present respectively reinforcing in the standard to be got is half estimation semiempirical value.
Summary of the invention
The present invention is directed to deficiency of the prior art and proposed a kind of quality that can judge the lath bond quality by test, with the shear strength tester and the method for testing shear strength of the smooth implementation that guarantees the correlation technique in the concrete structure reinforcement engineering.
This programme is realized by following technical measures: a kind of shear strength tester, it comprises the shearing support, dynamometer link, the registration instrument, it is characterized in that described shearing support comprises is left socle and the right support that herringbone is symmetricly set in the turning axle both sides, described left socle and right support front portion are articulated in turning axle and extend to turning axle the place ahead naturally and join, the right support rear end be hinged with hinge axis vertical plane on the dynamometer link swung, in the left socle rear end vertical slot is set, described vertical slot and dynamometer link are adaptive, are provided with screw rod and the nut adaptive with screw rod at the dynamometer link other end; Be provided with tension-compression sensor in dynamometer link, described tension-compression sensor is electrically connected with the registration instrument.
Shear the hinged power transmission boots in support force side, can guarantee that the power transmission boots contact with reinforcement material section maintenance face with concrete surface in the shear history, guarantee that shearing force is all the time perpendicular to the reinforcement material section.The workplace of power transmission boots is a rectangle, and the workplace size is mainly 1.2mm * 10mm (being applicable to the FRP lath), 3mm * 20mm (being applicable to steel plate), and the power transmission boots are replaceable, and the section form of being examined lath when making it and detecting is consistent.
The beneficial effect of this programme can be learnt according to the narration to such scheme, adopts lever principle, by tightening up dynamometer link shearing support galianconism end is opened, and by galianconism end power transmission boots the lath that bonds is sheared, and is tested its maximum shear stress.Can test the construction quality that lath is pasted on concrete structure reinforcement engineering middle-shallow layer build-in and surface.The built-in tension-compression sensor of dynamometer link not only can apply external force, can also export the external force of being tested.Beneficial effect of the present invention is that also this equipment has simple structure, and power transmission is clear and definite, and is easy and simple to handle, is easy to advantages such as maintenance, and this equipment does not need external power supply, can use under all kinds of environment.Therefore the present invention has compared with prior art realized technical purpose.
A kind of method for testing shear strength is characterized in that it comprises the steps: 1. instrument verification; 2. isolate or the exposure detected part; 3. with the maximum, force value before the shear strength tester test shear failure, calculate shear resistance.
Described instrument verification comprises the steps: to open registration instrument and registration zero clearing, the power transmission boots are withstood standard dynamometer, the bolt that screws on the dynamometer link pressurizes with active, divide 8～10 grades of orders to increase progressively the power of applying, every grade of reading that writes down registration instrument and standard dynamometer, up to the nominal force value, return to initial point then; Applying test power during value testing should be steady, is added to should slowly to apply before calibrating is put, so that accurate reading; Repeating this step measures three times; Set up registration instrument reading P of this instrument and the corresponding relation of standard dynamometer reading N, determine the proof force value of registration instrument reading representative: N=μ P+b
μ, b---instrument reduction coefficient, factors such as support length arm ratio, turning axle friction resistance are relevant with shearing.Instrument should be regularly (about general half a year) carries out verification, parts for maintenance such as registration instrument, dynamometer link or change after also should carry out verification.
When described isolation detected part is meant at the test of shallow-layer build-in lath shear resistance: at detected part vertical slats direction cutting lath and concrete, cutting groove depth is that building-in depth adds 5mm, stave lengths 15mm to be measured between grooving, the cross section at lath two ends exposes fully; Apply shearing force one side test trough is set, test trough width 70mm, opposite side is provided with the distortion groove, distortion well width 5mm; Remove laitance, foreign material in the grooving, expose clean concrete surface.
When described exposure test position was meant the test of pasting the lath shear resistance on the surface, at detected part vertical slats direction cutting lath and concrete, cutting groove depth was 5mm, stave lengths 15mm to be measured between grooving, and the cross section at lath two ends exposes fully; Apply the test trough that shearing force one side cuts out width 70mm, opposite side cuts out the distortion groove that width is 5mm; Remove laitance in the groove of test trough and distortion, foreign material etc., expose clean concrete surface.
Described with the maximum, force value before the shear strength tester test shear failure, calculate shear resistance and be meant: open the registration instrument of shear strength tester,, select peak value to keep the registration zero clearing; The power transmission boots of shearing support are put into test trough, shear the concrete inner wall that support one side power transmission boots prop up, opposite side power transmission boots prop up the xsect that exposes of being examined lath; Slowly the bolt of uniform rotation dynamometer link tightens up dynamometer link, and shearing support galianconism end is opened, and the power transmission boots push against gradually to be examined lath and to its applied thrust, finally make shear failure between lath and concrete, and the maximum, force value that this moment, the registration instrument showed is P (N); Calculate shear resistance f (MPa)
(the shear failure area is the product of lath section girth and shear surface length, mm to measure the shear failure area A that is examined lath
2), shear resistance f then:
By the shear resistance between lath and concrete, can draw the theoretical anchorage length l of lath
0:
In the formula: f
RP---the tensile strength standard value (MPa) of lath;
A
RP---the sectional area (mm of lath
2);
b
RP---the width (mm) of lath;
N---paste the face coefficient, the shallow-layer build-in is got n=2, and the surface is pasted and got n=1;
F---lath and concrete shear resistance (MPa).
This theoretical anchorage length can instruct design anchorage length value.
The application test of shear strength tester
Basic condition
Strenthening member is the C30 beams of concrete, adopts two 1.2mm * 10mmFRP lath build-ins at the bottom of the beam, after construction finishes, for detecting construction quality, adopts this equipment to detect.
The mensuration of instrument reduction coefficient
Above data are carried out linear regression, draw N=0.4827P-35.826
Promptly for this testing equipment: μ=0.4827, b=-35.826
Detection means is chosen three places detect, it is as follows to detect data:
Conclusion
The shear resistance that this test records is all greater than 2.5MPa, and greater than concrete tensile strength standard value among " Code for design of concrete structures " GB50010-2002, collapse state is concrete destruction.It is firm that the result shows that the FRP lath combines with concrete, and construction quality is good.This anchorage length computing method are based on the test measured value and obtain, and are different from common semiempirical half evaluation method, meet the actual conditions of engineering more.
By shear resistance f=2.5MPa, FRP lath design strength standard value is 2400MPa, then theoretical anchorage length l
0For:
Actual anchorage length 700mm meets the demands.
Description of drawings
The present invention is described in further detail below in conjunction with accompanying drawing.Fig. 1 is the shear strength tester structural representation; Fig. 2 is the shear strength tester exploded view; Fig. 3 is a shallow-layer build-in lath shear resistance test synoptic diagram; Fig. 4 is that lath shear resistance test synoptic diagram is pasted on the surface;
Among the figure, 1, the power transmission boots, 2, turning axle, 3, dynamometer link, 4, nut, 5, the registration instrument, 6, left socle, 7, right support, 8, shear support, 9, shallow-layer build-in lath, 10, build-in lath to be measured, 11, the distortion groove, 12, test trough, 13, the concrete sample that is reinforced, 14, the lath pasted of surface, 15, stickup lath to be measured, 16, vertical slot.
Embodiment
Shown in Fig. 1-2, a kind of shear strength tester, it comprises the shearing support, dynamometer link 3, registration instrument 5, it is characterized in that described shearing support comprises is left socle 6 and the right support 7 that herringbone is symmetricly set in turning axle 2 both sides, described left socle 6 and right support 7 front portions are articulated in turning axle 2 and extend to turning axle 2 the place aheads naturally and join, be hinged with the dynamometer link of on turning axle 2 axis vertical planes, swinging 3 in right support 7 rear ends, in left socle 6 rear ends vertical slot 16 is set, described vertical slot 16 is adaptive with dynamometer link 3, is provided with screw rod and the nut 4 adaptive with screw rod at dynamometer link 3 other ends; Be provided with tension-compression sensor in dynamometer link 3, described tension-compression sensor is electrically connected with registration instrument 5.
When adopting shallow-layer build-in lath 9 or surface to paste lath 10 in order to remedy in engineering structure strengthening reconstruction project xoncrete structure, equipment and method of testing all can not directly detect the deficiency of shear resistance at present, shear strength tester of the present invention and method of testing a kind of direct detection lath is provided and the concrete sample 13 that is reinforced between the instrumentation and the method for bond shear strength, the bond shear strength of being surveyed is the maximum shear between lath and the concrete, can provide parameter for the calculating of the theoretical anchorage length of lath then.
Shear support 8 and utilize lever principle, by folding of the long-armed side of lever (dynamometer link side) galianconism one side (power transmission boots side) is opened, power transmission boots 1 open Shi Yiduan and prop up concrete wall, and an end props up stickup lath 15 to be measured and to its applied thrust, makes it and concrete interface generation shear failure.Can test the size of shearing force during shear failure by dynamometer link 3, by the registration instrument 5 demonstration maximum shear stress of internal battery.This kind stress is consistent with lath stress in concrete, and the result who is tested can reflect the actual cementation power of lath.
" shear strength tester and method for testing shear strength " is when adopting shallow-layer build-in or surface to paste lath in engineering structure strengthening reconstruction project, detects the instrumentation and the method for bond shear strength between lath and the former xoncrete structure.This instrument is divided into dynamometer link 3, registration instrument 5, shears support 8 three parts.The effect of dynamometer link has two: the one, provide shearing force to shearing support, and the 2nd, test this shearing force automatically.It screws bolt 4 by external force and tightens up shearing support 8 long arm ends to apply shearing force, measures shear force value with the interior tension-compression sensor of establishing; Shear support 8 and be divided into left socle 6 and right support 7 two parts, can be around turning axle 2 rotations, the galianconism end opened when dynamometer link 3 tightened up the long arm end of left socle 6 and right support 7.Galianconism end one side power transmission boots 1 prop up concrete inner wall during test, and opposite side power transmission boots prop up the cross section of stickup lath 15 to be measured, and the galianconism end opens that 1 pair of lath of power transmission boots applies shearing force in the process.Shear support 8 galianconism ends and power transmission boots 1 and be articulated and connected, the power transmission boots can suitably rotate, to guarantee that the power transmission boots are face with the cross section of concrete surface and stickup lath 15 to be measured all the time and contact in the shearing stent open process; Power transmission boots 1 have multiple section form and replaceable, and the section form of being examined lath when making it and detecting is consistent, to guarantee carrying out smoothly of shear resistance test.Registration instrument 5 built-in powers can be connected with dynamometer link 3 output ports easily, and functions such as zero clearing and the maintenance of registration peak value should be arranged.
A kind of method for testing shear strength, it comprises the steps:
1 pair of shear strength tester verification
Shear strength tester should be regularly (about general half a year) carries out verification, parts for maintenance such as registration instrument, dynamometer link or change after also should carry out verification, checking procedure is as follows:
Open registration instrument and registration zero clearing, the power transmission boots are withstood standard dynamometer, the bolt that screws on the dynamometer link pressurizes with active, divide 8～10 grades of orders to increase progressively the power of applying, every grade of reading that writes down registration instrument and standard dynamometer up to the nominal force value, returns to initial point then.Applying test power during value testing should be steady, is added to should slowly to apply before calibrating is put, so that accurate reading.Repeating this step measures three times.
Set up the registration instrument reading P of shear strength tester and the corresponding relation of standard dynamometer reading N, determine the proof force value of registration instrument reading representative:
N＝μ·P+b
μ, b---instrument reduction coefficient, factors such as support length arm ratio, turning axle friction resistance are relevant with shearing.
As shown in Figure 3: the method for testing of shallow-layer build-in lath shear resistance
1 isolates detected part
At detected part vertical slats direction cutting shallow-layer build-in lath 9 and concrete, cutting groove depth is that building-in depth adds 5mm, build-in lath 10 length 15mm to be measured between grooving, and the cross section at build-in lath to be measured 10 two ends exposes fully.Apply shearing force one side and cut out test trough 12, test trough 12 width 70mm, opposite side cut out distortion groove 11, distortion groove 11 width 5mm.Remove laitance in test trough 12 and the distortion groove 11, foreign material etc., expose clean concrete surface.
2 test shearing forces
Open the registration instrument 5 of shear strength tester, the registration zero clearing selects peak value to keep.The power transmission boots 1 of shearing support 8 galianconism ends are put into test trough 12, shear the concrete inner wall that power transmission boots of support 8 galianconism ends prop up, another power transmission boots prop up the xsect that exposes of build-in lath 10 to be measured.The bolt 4 of slow uniform rotation dynamometer link 3, tighten up dynamometer link 3, make and shear support 8 galianconism ends and open, power transmission boots 1 push against build-in lath 10 to be measured and gradually to its applied thrust, finally make shear failure between build-in lath 10 to be measured and concrete, this moment, the maximum, force value of registration instrument 5 demonstrations was P (N).
3 calculate shear resistance f (MPa)
Measure the shear failure area A (mm of build-in lath 10 to be measured
2), shear resistance then:
As shown in Figure 4, the method for testing of lath shear resistance is pasted on the surface
1 exposes detected part.
2 test shearing forces.
Open the registration instrument 5 of shear strength tester, the registration zero clearing selects peak value to keep.To shear support 8 force side power transmission boots 1 and put into test trough 12, lath 14 xsects are pasted on concrete wall that shearing support 8 galianconism ends one side power transmission boots prop up or the surface that counter-force is provided, and opposite side power transmission boots prop up the xsect that exposes of stickup lath 15 to be measured.The bolt 4 of slow uniform rotation dynamometer link 3, tighten up dynamometer link 3, shearing support 8 galianconism ends are opened, power transmission boots 1 push against stickup lath 15 to be measured and gradually to its applied thrust, stickup lath 15 to be measured and concrete shearing are destroyed, and this moment, the maximum, force value of registration instrument 5 demonstrations was shearing force P (N).
3 calculate shear resistance f (MPa).
Measure the shear failure area A (mm of stickup lath 15 to be measured
2), shear resistance then:
The computing method of the theoretical anchorage length of lath
By the shear resistance between lath and concrete, can draw the theoretical anchorage length l of lath
0:
In the formula: f
RP---the tensile strength standard value (MPa) of lath;
A
RP---the sectional area (mm of lath
2);
b
RP---the width (mm) of lath;
N---paste the face coefficient, the shallow-layer build-in is got n=2, and the surface is pasted and got n=1;
F---lath and concrete shear resistance (MPa).
This theoretical anchorage length computing method are based on the test measured value and obtain, and are different from common semiempirical half evaluation method, meet the actual conditions of engineering more, can instruct design anchorage length value.
Claims (4)
1. shear strength tester, it comprises shears support, dynamometer link, registration instrument, it is characterized in that described shearing support comprises is left socle and the right support that herringbone is symmetricly set in the turning axle both sides, described left socle and right support front portion are articulated in turning axle and extend to turning axle the place ahead naturally and join, the right support rear end be hinged with hinge axis vertical plane on the dynamometer link swung, in the left socle rear end vertical slot is set, described vertical slot and dynamometer link are adaptive, are provided with screw rod and the nut adaptive with screw rod at the dynamometer link other end; Be provided with tension-compression sensor in dynamometer link, described tension-compression sensor is electrically connected with the registration instrument.
2. shear strength tester according to claim 1 is characterized in that shearing the hinged power transmission boots in support force side.
3. shear strength tester according to claim 2, the workplace that it is characterized in that the power transmission boots is a rectangle.
4. a method for testing shear strength is characterized in that a kind of method for testing shear strength, and it comprises the steps: 1. to the shear strength tester verification; 2. isolate or the exposure detected part; 3. with the maximum, force value before the shear strength tester test shear failure, calculate shear resistance;
Described instrument verification comprises the steps: to open registration instrument and registration zero clearing, the power transmission boots are withstood standard dynamometer, the bolt that screws on the dynamometer link pressurizes with active, divide 8～10 grades of orders to increase progressively the power of applying, every grade of reading that writes down registration instrument and standard dynamometer, up to the nominal force value, return to initial point then; Applying test power during value testing should be steady, is added to should slowly to apply before calibrating is put, so that accurate reading; Repeating this step measures three times; Set up registration instrument reading P of this instrument and the corresponding relation of standard dynamometer reading N, determine the proof force value of registration instrument reading representative: N=μ P+b; Instrument should regularly carry out verification, also should carry out verification after registration instrument, dynamometer link parts for maintenance or the replacing;
Described isolation detected part is meant: at the vertical shallow-layer build-in of detected part lath direction cutting lath and concrete, cutting groove depth is that building-in depth adds 5mm, stave lengths 15mm to be measured between grooving, and the cross section at lath two ends exposes fully; Apply shearing force one side test trough is set, test trough width 70mm, opposite side is provided with the distortion groove, distortion well width 5mm; Remove laitance, foreign material in the grooving, expose clean concrete surface;
Described exposure detected part is meant in the detected part vertical surface pastes lath direction cutting lath and concrete, and cutting groove depth is 5mm, stave lengths 15mm to be measured between grooving, and the cross section at lath two ends exposes fully; Apply the test trough that shearing force one side cuts out width 70mm, opposite side cuts out the distortion groove that width is 5mm; Remove laitance, foreign material in test trough and the distortion groove, expose clean concrete surface;
Described with the maximum, force value before the shear strength tester test shear failure, calculate shear resistance and be meant: open the registration instrument of shear strength tester,, select peak value to keep the registration zero clearing; The power transmission boots of shearing support are put into test trough, shear the concrete inner wall that support one side power transmission boots prop up, opposite side power transmission boots prop up the xsect that exposes of being examined lath; Slowly the bolt of uniform rotation dynamometer link tightens up dynamometer link, and shearing support galianconism end is opened, and the power transmission boots push against gradually to be examined lath and to its applied thrust, finally make shear failure between lath and concrete, and the maximum, force value that this moment, the registration instrument showed is P; Calculate shear resistance f:
Measure the shear failure area A that is examined lath, the mm of unit
2, shear resistance then:
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| SU1714469A1 (en) * | 1988-12-01 | 1992-02-23 | Ленинградский горный институт им.Г.В.Плеханова | Work organ of device for determination of adhesive shear strength of lutes |
| CN2541145Y (en) * | 2002-04-23 | 2003-03-26 | 蒋绍斌 | Flexible plastic tube automatic cutting off appts. |
| CN2793719Y (en) * | 2005-04-26 | 2006-07-05 | 华侨大学 | Material binding and stripping experimental apparatus |
| CN201589738U (en) * | 2010-02-10 | 2010-09-22 | 山东省建筑科学研究院 | Shearing strength tester |
-
2010
- 2010-02-10 CN CN 201010107968 patent/CN101793649B/en not_active Expired - Fee Related
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| SU1714469A1 (en) * | 1988-12-01 | 1992-02-23 | Ленинградский горный институт им.Г.В.Плеханова | Work organ of device for determination of adhesive shear strength of lutes |
| CN2541145Y (en) * | 2002-04-23 | 2003-03-26 | 蒋绍斌 | Flexible plastic tube automatic cutting off appts. |
| CN2793719Y (en) * | 2005-04-26 | 2006-07-05 | 华侨大学 | Material binding and stripping experimental apparatus |
| CN201589738U (en) * | 2010-02-10 | 2010-09-22 | 山东省建筑科学研究院 | Shearing strength tester |
Non-Patent Citations (2)
| Title |
|---|
| 陈莉 等.嵌贴CFRP板条加固混凝土梁抗剪性能试验研究.《山西建筑》.2009,第35卷(第13期),3-5. |
| 陈莉等.嵌贴CFRP板条加固混凝土梁抗剪性能试验研究.《山西建筑》.2009,第35卷(第13期),3-5. * |
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Inventor after: Cheng Bo Inventor after: Cui Shiqi Inventor after: Jiang Liping Inventor after: Chen Li Inventor before: Cui Shiqi Inventor before: Cheng Bo Inventor before: Chen Li |
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Application publication date: 20100804 Assignee: Shandong Jianke Speical Building Engineering Technology Center Assignor: Building Science Inst., Shandong Prov. Contract record no.: 2014370000009 Denomination of invention: Shear strength tester and method for testing shear strength Granted publication date: 20110504 License type: Exclusive License Record date: 20140305 |
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