CN103048264B - Anchorage performance detection testing apparatus and method for carbon fiber adhesion reinforcement - Google Patents
Anchorage performance detection testing apparatus and method for carbon fiber adhesion reinforcement Download PDFInfo
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- CN103048264B CN103048264B CN201310022530.1A CN201310022530A CN103048264B CN 103048264 B CN103048264 B CN 103048264B CN 201310022530 A CN201310022530 A CN 201310022530A CN 103048264 B CN103048264 B CN 103048264B
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Abstract
The invention discloses an anchorage performance detection testing apparatus for carbon fiber adhesion reinforcement. The testing apparatus comprises a testing bench, a concrete test piece, a test fixture and a loading system. The reinforced concrete test bench is composed of a base, a blocking bed, a connecting bed and a stretching bed, carbon fiber sheets are adhered to the test piece, and a steel pressing plate and an anchor bolt are taken as auxiliary anchoring pieces; the test fixture is composed of an external covering steel plate, two inner clamping steel plates and a high-strength split bolt, strip-shaped steel teeth are formed on the surface of the external covering steel plate, pole steel teeth are formed on the surfaces of the inner clamping steel plates, the carbon fiber sheets are placed between the two inner clamping steel plates, the carbon fiber sheets and the two inner clamping steel plates are firmly adhered together by dipping glue, and the high-strength split bolt clamps the external covering steel plate, the inner clamping steel plates and the carbon fiber sheets; and the loading system is composed of a connecting screw rod, a tensile connecting steel plate, a tensile screw rod, a lifting jack and a sensor. The testing apparatus provided by the invention can quickly carry out an anchorage zone stress performance test on a concrete beam reinforced with adhesion of the carbon fiber sheets, and has the advantages of being convenient to make and simple to operate, and the like.
Description
Technical field
The invention belongs to field of civil engineering, relate to a kind of detection technique of carbon fiber strengthening with external bonding, particularly relate to a kind of anchoring property detection experiment device of carbon fiber strengthening with external bonding.
Background technology
Carbon fibre material has lightweight, the excellent properties such as high-strength, corrosion-resistant, and in recent years, carbon fibre material, as a kind of emerging reinforcement material, is widely used in civil engineering structure field of reinforcement.Carbon fiber reinforcement preparing structure technology is another the novel structural strengthening technology after enlarge concrete section, steel-bonded reinforcement, have and reinforce that bearing capacity is high, the multiple advantage such as convenient of constructing, be widely used in building construction, bridge structure reinforcing engineering project, obtained extremely significant economic effect and social effect.
The outer sticky structural strengthening of carbon fibre composite to existing building uses comparatively common a kind of means at present stage.How is consolidation effect? depend primarily on two aspects: be accurate, rational Scheme of Strengthening on the one hand; Another aspect is qualified, effective construction quality.The Scheme of Strengthening do not had, carbon fibre fabric can not accurately play consolidation effect after pasting and; Underproof construction quality, as cohesive strength does not reach code requirement, even large-area hollowing, the carbon fiber sticked is not reinforcement material, but has become " ornament materials ".Therefore, for sticking carbon fiber reinforcing engineering project, tackle its Scheme of Strengthening and construction quality and carry out comprehensively strict detection and check on.
Existing carbon fiber sheet in reinforcement of concrete beam delivery receiving acceptance Measures compare is simple, just carries out carbon fiber and pastes the scene adding flatness inspection and carbon fiber cohesive strength and just draw testing inspection.Specification specifies that the bond quality between fiber composite material and concrete detects, available hammering method or other effective probe methods check, 95% of total bond area should not be less than, to carry out the qualitative evaluation of carbon fiber reinforcement quality whole structure according to total effectively bond area that check result confirms.Specification regulation, according to carbon fiber reinforcement area, determines the sampling number just drawing testing inspection, requires that the cohesive strength of just drawing reaching carbon fiber and concrete surface is greater than 2.5MPa, carries out the quantitative detection control of carbon fiber reinforcement quality regional area.
When adopting Analyses of CFRP-reinforcement of RC Beams, affect a lot of because have of its consolidation effect, except carbon fibre material intensity, reinforce except impregnated resin cohesive strength, the carbon fiber stickup number of plies, the concrete strength grade of reinforcement, reinforcement shear span ratio, reinforcement end add supplementary anchorage measure and all can affect to the load-carrying properties of Beams Strengthened With Carbon in addition.Existing carbon fiber sheet in reinforcement of concrete beam acceptance specification, certain weak point is there is in detection operation, what specification just carried out the inspection of carbon fiber reinforcement flatness and on-the-spot carbon fiber cohesive strength just draws testing inspection, specification adopts just is drawing testing inspection to replace the test of carbon fiber plate shear bonding strength, the anchorage zone Experiment of Mechanical Behavior that specification does not carry out the key position of carbon fiber strengthening with external bonding detects, and the anchoring property detection experiment device that sticking carbon fiber is reinforced is needed in structural fortification field badly.
When pasting multi-storey up-down and translation or Tests of Reinforced Concrete Beams Strengthened With Cfrp-laminate, if do not take reasonably to add supplementary anchorage measure, because crack place shear stress is excessive, carbon fiber plate and concrete surface may stripping damages too early, the anchorage zone of Beams Strengthened With Carbon will be caused to lose efficacy once Beams Strengthened With Carbon anchorage zone diagonal crack place carbon fiber adhesion interface occurs to shear stripping damage, carbon fiber reinforcement girder construction premature degradation, during destruction, carbon fibre material does not reach its intensity, causes Beams Strengthened With Carbon can not accurately play consolidation effect.Therefore, paste the engineering project of multi-storey up-down and translation or carbon fiber board reinforced concrete beam, anchorage zone Experiment of Mechanical Behavior detection should be carried out, the rationality of the anchoring critical area design proposal of checking sticking carbon fiber sheet material reinforcement of rc beam.
When run into paste the number of plies more or carbon fiber board time, in time running into sticking carbon fiber reinforcement amount and be large, before formal construction goes into operation, the construction level of the sticking carbon fiber of construction team should be grasped in time, the level must carrying out sticking carbon fiber is tested to shear bond power, to accomplish to know what's what, pinpoint the problems early, in order to avoid there is " sticking carbon fiber becomes decoration and pastes wallpaper " construction team's phenomenon, carry out the anchoring property detection experiment of carbon fiber strengthening with external bonding, construction technology model can be set up, facilitate management management work.
Problem the most key in carbon cloth reinforcing concrete structure technique is the quality of the adhesive property between carbon cloth and concrete, adopt reliable detection method, detection validation carbon fiber reinforcement girder anchorage zone load-bearing capacity, can guarantee Beams Strengthened With Carbon structural bearing capacity safety.The concrete rectangular parallelepiped of suggestion employing 300 × 300 × 1200mm is as test test specimen, carry out test test specimen carbon fiber strengthening with external bonding, wait for carbon fiber special cementing hard after, transport test test specimen is to structural test inspection center, carry out carbon fiber reinforcement anchorage zone Experiment of Mechanical Behavior platform detection experiment, detect construction quality, the stress performance of checking carbon fiber reinforcement girder anchorage zone, the rationality of checking design proposal, so that the construction of follow-up carbon fiber reinforcement is normally carried out.
Summary of the invention
Technical matters: the anchoring property detection experiment device that the invention provides a kind of carbon fiber strengthening with external bonding easy to make, simple to operate, the anchorage zone stress performance detection experiment of carbon fiber plate strengthening with external bonding beams of concrete can be carried out fast, the rationality of checking design proposal, the level can carrying out sticking carbon fiber is tested to shear bonding strength, detects the construction quality of sticking carbon fiber.
Technical scheme:
An anchoring property detection experiment device for carbon fiber strengthening with external bonding, is made up of reinforced concrete testing bed, testing stand, reinforced concrete rectangular parallelepiped test specimen, carbon fiber plate testpieces, piggy-back anchor firmware, test fixture, connecting screw rod, stretch-draw junction steel plate, tensioning screw rod and centre-hole jack and sensor.Reinforced concrete rectangular parallelepiped test specimen is placed on the end face of reinforced concrete testing bed, testing stand, and hold out against with the gear platform of reinforced concrete testing bed, testing stand, carbon fiber plate testpieces is pasted onto reinforced concrete rectangular parallelepiped test specimen upper surface, piggy-back anchor firmware compresses carbon fiber plate testpieces, the afterbody of carbon fiber plate testpieces adopts test fixture clamping, four connecting screw rods are welded on the enclosing cover surface of steel plate of test fixture, by connecting screw rod, test fixture is connected drawing with stretch-draw junction steel plate, the left part of tensioning screw rod is connected with stretch-draw junction steel plate bolt, tensioning screw rod right-hand member is connected with centre-hole jack and sensor through the stretching bed seat preformed hole of reinforced concrete testing bed, testing stand.
Reinforced concrete testing bed, testing stand comprises pedestal, gear platform, Lian Tai and stretching bed, reinforced concrete testing bed, testing stand adopts Reinforced Concrete Materials primary concreting shaping, pedestal is positioned at the bottom of reinforced concrete testing bed, testing stand, pedestal sets gradually gear platform, Lian Tai and stretching bed, circular port is set in the middle part of stretching bed, on the right of stretching bed, pre-embedded steel slab is set.
The piggy-back anchor firmware of sticking carbon fiber reinforcement comprises steel bar pressing plate and anchoring peg, and steel bar pressing plate is arranged on above carbon fiber plate testpieces, and the two ends of steel bar pressing plate are provided with anchoring peg, and anchoring peg is taken root on reinforced concrete testing bed, testing stand.
Test fixture of the present invention comprises enclosing cover steel plate, inner clip steel plate and to drawing high strength bolt, the surface of enclosing cover steel plate arranges serrate strip steel-tooth, enclosing cover steel plate and strip steel-tooth are the globality finished products adopting metalworking machinery processing and fabricating, inner clip surface of steel plate welding pole steel-tooth, carbon fiber plate to be placed between upper and lower two blocks of inner clip steel plates and to adopt impregnated structures glue strong bond, upper and lower two pieces of inner clip steel plate arranged outside two blocks of enclosing cover steel plates, to drawing high the preformed hole of strength bolt through upper and lower two blocks of enclosing cover steel plates, fixture is tightened up, fixture steel bracket supports test fixture.
Adopt the anchoring property detection experiment device of carbon fiber strengthening with external bonding to carry out detection experiment, comprise the following steps:
The first step: make multiple reinforced concrete rectangular parallelepiped test specimen, impregnated structures glue is adopted carbon fiber plate testpieces to be pasted onto reinforced concrete rectangular parallelepiped test specimen upper surface, piggy-back anchor firmware is adopted to compress carbon fiber plate testpieces, wait for impregnated structures cementing hard after, transport test test specimen is to structural test inspection center;
Second step: the test test specimen after being reinforced by sticking carbon fiber is placed on the end face at reinforced concrete testing bed, testing stand, and hold out against with the gear platform of reinforced concrete testing bed, testing stand, the afterbody of carbon fiber plate testpieces adopts test fixture clamping, by connecting screw rod, test fixture is connected with stretch-draw junction steel plate drawknot, tensioning screw rod and centre-hole jack and sensor are installed;
3rd step: start oil pump, the anchoring property detection experiment device carrying out carbon fiber strengthening with external bonding carries out detection experiment, record test figure, observes test specimen fastening destruction form, detects construction quality, provide test report.
The anchoring property detection experiment device of carbon fiber strengthening with external bonding of the present invention can be divided into reinforced concrete testing bed, testing stand system, test sample system, test fixture system and stretch-draw loading system are divided into four major parts, each system synergistic working.
Reinforced concrete testing bed, testing stand is the most basic civil engineering part of test unit, the acting as of gear platform structure is withstood test test specimen and is stoped it to move, stretching bed provides trial load power, the company's of setting platform structure between gear platform and stretching bed, connect platform and bear pressure equilibrium gear platform and stretching bed co-acting force, connect the stressed cantilever height that platform reduces gear platform and stretching bed, the operating platform of the double fixture of doing experiment of gear platform.
Test sample system forms by testing test specimen, carbon fiber plate and piggy-back anchor firmware, test test specimen adopts reinforced concrete rectangular structure form, processing and fabricating is convenient, carbon fiber plate is multi-storey up-down and translation or carbon fiber sheet, carbon fiber plate is pasted onto test test specimen upper surface, piggy-back anchor firmware is form or other form that keeper plate of steel adds anchoring peg, and test sample system has compact, simple operation and other advantages, can conveniently be transported to structural test center.
Test fixture system is by enclosing cover steel plate, inner clip steel plate and form drawing high strength bolt, the surface of enclosing cover steel plate arranges strip steel-tooth, enclosing cover steel plate and strip steel-tooth are the globality finished products adopting metalworking machinery processing and fabricating, inner clip surface of steel plate welding pole steel-tooth, carbon fiber plate is placed between upper and lower two blocks of inner clip steel plates, adopt impregnated structures glue by carbon fiber plate and upper and lower two pieces of inner clip steel plate strong bond, to drawing high the preformed hole of strength bolt through upper and lower two blocks of enclosing cover steel plates, enclosing cover steel plate, inner clip steel plate and carbon fiber sheet fixture tighten up by tightening bolt.
Stretch-draw loading system is made up of connecting screw rod, stretch-draw junction steel plate, tensioning screw rod and centre-hole jack and sensor, the left part of 4 connecting screw rods is connected with piece fixture Plate Welding, by connecting screw rod, test fixture is connected drawing with stretch-draw junction steel plate, connecting screw rod pulling force is transformed into tensioning screw rod by stretch-draw junction steel plate, tensioning screw rod left part is connected with stretch-draw junction steel plate nut, tensioning screw rod right part is connected with centre-hole jack and sensor, this stretch-draw loading system have stressed reliable, acquisition test data convenient and simple operation and other advantages.
Beneficial effect: compared to the prior art the present invention, has the following advantages:
Along with the development of carbon fiber strengthening with external bonding application, stickup multilayer carbon fiber or carbon fiber board project of reinforcing gets more and more, to sticking carbon fiber concrete beam body construction quality and supplementary anchorage technical requirement more and more higher, need carry out sticking carbon fiber shear bonding strength test and carbon fiber reinforcement anchoring property test.
The invention provides a kind of anchoring property test unit of carbon fiber strengthening with external bonding, the level of carrying out sticking carbon fiber is tested to shear bond power, what replace sticking carbon fiber to reinforce just draws method for testing and detecting, detect the construction quality that sticking carbon fiber is reinforced more scientificly, pass judgment on the anchoring stress performance of sticking carbon fiber reinforcement of rc beam more scientificly.Novel test device is divided into four major parts to form by reinforced concrete testing bed, testing stand system, test sample system, test fixture system and stretch-draw loading system, and each system synergistic working, has easy to make, economical and practical and simple operation and other advantages.
Adopt reinforced concrete building material, build testing bed, testing stand, have and make the advantages such as simple, price is low.Testing bed, testing stand is made up of pedestal, gear platform, Lian Tai and stretching bed, connecting platform is arranged between gear platform and stretching bed, connect platform and bear the trial load that pressure can balance gear platform and stretching bed, Lian Taike reduces the jib-length of gear platform and stretching bed, reduce Bending Moment, and connect the operating platform of the double fixture of doing experiment of platform, therefore, reinforced concrete testing bed, testing stand system has the features such as structure simple structure, reasonable stress.
Carbon fiber plate is pasted onto on reinforced concrete rectangular parallelepiped test test specimen, adopt keeper plate of steel and crab-bolt as the piggy-back anchor firmware of sticking carbon fiber, wait for carbon fiber special cementing hard after, transport test test specimen is to structural test inspection center, carry out carbon fiber reinforcement anchorage zone Experiment of Mechanical Behavior pedestal detection experiment, the rationality of checking design proposal, detects construction quality.For each project under construction, test test specimen after just needing unit in charge of construction to provide sticking carbon fiber to reinforce, testing bed, testing stand and testing equipment can repeatedly reuse, therefore, test unit of the present invention have simple to operate, can repeatedly reuse, the advantage such as convenient management.
The pole steel-tooth of the enclosing cover steel plate strip steel-tooth of test fixture and the welding of inner clip surface of steel plate can be engaged, avoids relative movement occurring between the two, guarantee that inner clip Interal fixation is located.Adopt the firm gluing carbon fiber plate of impregnated structures glue between two layers of inner clip steel plate, guarantee the anchoring effect between carbon fiber plate and inner clip steel plate; Tighten up and can provide very large pressure to two blocks of inner clip steel plates to drawing high strength bolt, inner clip steel plate and carbon fiber plate have larger friction force, can further improve anchor force between carbon fiber plate and inner clip steel plate.Test fixture simple structure, small and exquisite, reliably stressed, for each test, only need change the inner clip steel plate of low price, without the need to changing the enclosing cover steel plate of high price, new test fixture has the features such as easy to operate, economical and practical.
Connecting screw rod is welded on the enclosing cover surface of steel plate of test fixture, by stretch-draw junction steel plate by connecting screw rod pull transfer to tensioning screw rod, tensioning screw rod is connected with centre-hole jack and sensor through the stretching bed seat preformed hole of reinforced concrete testing bed, testing stand, stretch-draw jack can carry out test and load, stretch-draw loading system of the present invention has reliably stressed, simple structure, the features such as acquisition test data are convenient.
Traditional carbon fiber bonding is just drawing the normal direction cohesive strength tested and can only detect between carbon cloth and concrete, indirectly can only evaluate the construction quality of sticking carbon fiber.And the level of sticking carbon fiber is to the test of shear bond power, directly can checks carbon fiber strengthening with external bonding construction quality, the anchorage zone stress performance of carbon fiber plate strengthening with external bonding beams of concrete can be detected, the rationality of checking design proposal.The anchoring property test unit of carbon fiber strengthening with external bonding of the present invention, the stressed reliability of sticking carbon fiber reinforcement anchorage zone can be detected, judge that carbon fiber anchorage zone diagonal crack place carbon fiber adhesion interface occurs whether to shear stripping damage, the supplementary anchorage scheme rationality of multilayer carbon fiber or carbon fiber board reinforcement is pasted in checking, guarantees the bearing capacity security of sticking carbon fiber concrete strengthening beam.
Accompanying drawing explanation
Fig. 1 is the elevational schematic view of the anchoring property detection experiment device of carbon fiber strengthening with external bonding;
Fig. 2 is the elevational schematic view of the reinforced concrete testing bed, testing stand in Fig. 1;
Fig. 3 is the floor map of the reinforced concrete testing bed, testing stand in Fig. 1;
Fig. 4 is the floor plan schematic diagram of the piggy-back anchor firmware in Fig. 1;
Fig. 5 is the mutual relationship schematic diagram of test fixture, connecting screw rod and stretch-draw junction steel plate in Fig. 1;
Fig. 6 is the elevational schematic view of the stretch-draw junction steel plate in Fig. 1;
Fig. 7 is the diagrammatic cross-section of the test fixture in Fig. 1;
Fig. 8 is the outer cover plate floor map of the test fixture in Fig. 7;
Fig. 9 is the inner splint floor map of the test fixture in Fig. 7;
Have in figure: reinforced concrete testing bed, testing stand 1; Pedestal 11; Gear platform 12; Connect platform 13; Stretching bed 14; Circular port 15; Pre-embedded steel slab 16; Reinforced concrete rectangular parallelepiped test specimen 2; Carbon fiber plate testpieces 3; Piggy-back anchor firmware 4; Steel bar pressing plate 41; Anchoring peg 42; Test fixture 5; Enclosing cover steel plate 51; Strip steel-tooth 52; Inner clip steel plate 53; Pole steel-tooth 54; To drawing high strength bolt 55; Fixture steel bracket 56; Connecting screw rod 6; Stretch-draw junction steel plate 7; Tensioning screw rod 8; Centre-hole jack and sensor 9.
Embodiment
Below in conjunction with Figure of description, the present invention is further described in detail.
Embodiment 1:
The anchoring property detection experiment device of carbon fiber strengthening with external bonding of the present invention, is made up of reinforced concrete testing bed, testing stand 1, reinforced concrete rectangular parallelepiped test specimen 2, carbon fiber plate testpieces 3, piggy-back anchor firmware 4, test fixture 5, connecting screw rod 6, stretch-draw junction steel plate 7, tensioning screw rod 8, centre-hole jack and sensor 9.Reinforced concrete rectangular parallelepiped test specimen 2 is placed on the end face of reinforced concrete testing bed, testing stand 1, and hold out against with the gear platform of reinforced concrete testing bed, testing stand 1, carbon fiber plate testpieces 3 is pasted onto reinforced concrete rectangular parallelepiped test specimen 2 upper surface, piggy-back anchor firmware 4 compresses carbon fiber plate testpieces 3, the afterbody of carbon fiber plate testpieces 3 adopts test fixture 5 to clamp, four connecting screw rods 6 are welded on the enclosing cover surface of steel plate of test fixture 5, by connecting screw rod 6, test fixture 5 is connected drawing with stretch-draw junction steel plate 7, the left part of tensioning screw rod 8 is connected with stretch-draw junction steel plate 7 bolt, tensioning screw rod 8 right-hand member is connected with centre-hole jack and sensor 9 through the stretching bed seat preformed hole of reinforced concrete testing bed, testing stand 1.
Reinforced concrete testing bed, testing stand 1 comprises pedestal 11, gear platform 12, connects platform 13 and stretching bed 14, reinforced concrete testing bed, testing stand 1 adopts Reinforced Concrete Materials primary concreting shaping, pedestal 11 is positioned at the bottom of reinforced concrete testing bed, testing stand 1, pedestal 11 sets gradually gear platform 12, connect platform 13 and stretching bed 14, circular port 15 is set in the middle part of stretching bed 14, pre-embedded steel slab 16 is set on the right of stretching bed 14.
Piggy-back anchor firmware 4 comprises steel bar pressing plate 41 and anchoring peg 42, and steel bar pressing plate 41 is arranged on above carbon fiber plate testpieces 3, and the two ends of steel bar pressing plate 41 are provided with anchoring peg 42, and anchoring peg 42 is taken root on reinforced concrete testing bed, testing stand 1.
Test fixture 5 comprises enclosing cover steel plate 51, strip steel-tooth 52, inner clip steel plate 53, pole steel-tooth 54 and to drawing high strength bolt 55, the surface of enclosing cover steel plate 51 arranges serrate strip steel-tooth 52, enclosing cover steel plate 51 and strip steel-tooth 52 are the globality finished products adopting metalworking machinery processing and fabricating, inner clip steel plate 53 surface-welding pole steel-tooth 54, carbon fiber plate 3 to be placed between upper and lower two blocks of inner clip steel plates 53 and to adopt impregnated structures glue strong bond, upper and lower two pieces of inner clip steel plate 53 arranged outside two blocks of enclosing cover steel plates 51, to drawing high the preformed hole of strength bolt 55 through upper and lower two blocks of enclosing cover steel plates 51, fixture is tightened up, fixture steel bracket 56 supports test fixture 5.
Embodiment 2:
The anchoring property detection experiment device applying above-mentioned carbon fiber strengthening with external bonding carries out detection experiment, comprises the following steps:
Step 1) make multiple reinforced concrete rectangular parallelepiped test specimen 2, impregnated structures glue is adopted carbon fiber plate testpieces 3 to be pasted onto reinforced concrete rectangular parallelepiped test specimen 2 upper surface, piggy-back anchor firmware 4 is adopted to compress carbon fiber plate testpieces 3, wait for impregnated structures cementing hard after, transport test test specimen is to structural test inspection center;
Step 2) above-mentioned test test specimen is placed on the end face at reinforced concrete testing bed, testing stand 1, and hold out against with the gear platform of reinforced concrete testing bed, testing stand 1, the afterbody of carbon fiber plate testpieces 3 adopts test fixture 5 to clamp, by connecting screw rod 6, test fixture 5 is connected with stretch-draw junction steel plate 7 drawknot, tensioning screw rod 8 and centre-hole jack and sensor 9 are installed;
Step 3) start oil pump, the anchoring property detection experiment device carrying out carbon fiber strengthening with external bonding carries out detection experiment, record test figure, observes test specimen fastening destruction form, detects construction quality, provide test report.
Embodiment 3:
Make the anchoring property detection experiment device of carbon fiber strengthening with external bonding, for verifying the rationality of carbon fiber reinforcement Anchorage Plan and detecting the construction quality of carbon fiber reinforcement.The base plane of reinforced concrete testing bed, testing stand is of a size of 900 × 3900mm, thickness is 500mm, pedestal sets gradually gear platform, Lian Tai and stretching bed, gear platform sectional dimension is 350 × 250mm, connecting platform structure cross-section dimensions is 400 × 200mm, stretching bed sectional dimension is 450 × 600mm, arranges φ 40mm preformed hole at the middle part of stretching bed, and on the right of stretching bed, embedded iron steel plate thickness is 12mm.Reinforced concrete rectangular parallelepiped sample dimensions is 300 × 300 × 1200mm, inside joins 4 φ 12 longitudinal reinforcements, φ 6@200 stirrup.Carbon fiber plate method of attaching and piggy-back anchor firmware method to set up are divided into three groups, often organize carbon fiber plate width and are 100mm, wherein a group: paste two layers of thick carbon cloth of 0.168mm, without supplementary anchorage measure; B group: paste five layers of thick carbon cloth of 0.168mm, arranges 5 road 200mm piggy-back anchor firmwares, and adopt the thick press strip steel plate of 5mm, press strip steel plain is of a size of 50 × 200mm steel plate, adopts φ 6mm anchoring peg; C group: paste the thick one deck carbon fiber sheet of 1.4mm, arrange 5 road 250mm piggy-back anchor firmwares, adopt the thick press strip steel plate of 8mm, press strip steel plain is of a size of 60 × 200mm steel plate, adopts φ 14mm anchoring peg.Test fixture comprises two blocks of enclosing cover steel plates, two blocks of inner clip steel plates and the six roots of sensation are to drawing high strength bolt, the surface of enclosing cover steel plate arranges 7 road strip steel-tooths, enclosing cover steel plate thickness is 16mm, strip steel-tooth height is 16mm, strip steel-tooth root is wide is 16mm, strip steel-tooth top width is 8mm, the length of strip steel-tooth is 150mm, enclosing cover steel plate and strip steel-tooth are the globality finished products adopting metalworking machinery processing and fabricating, inner clip surface of steel plate welds 6 road pole steel-tooths, inner clip steel plate adopts 8mm steel plate, pole steel-tooth adopts φ 12mm round bar to process, pole steel-tooth length is 150mm, carbon fiber plate to be placed between upper and lower two blocks of inner clip steel plates and to adopt impregnated structures glue strong bond, upper and lower two pieces of inner clip steel plate arranged outside two blocks of enclosing cover steel plates, to drawing high the six roots of sensation high-strength bolt that strength bolt employing diameter is φ 16mm, to drawing high the preformed hole of strength bolt through upper and lower two blocks of enclosing cover steel plates, fixture is tightened up, fixture steel bracket supports test fixture.Adopt 4 φ 16mm fining twisted steels as connecting screw rod, connecting screw rod left end is welded to connect on test fixture outside surface, and connecting screw rod right-hand member adopts bolt to be connected with stretch-draw junction steel plate.Stretch-draw junction steel plate profile is inverted T-shaped, adopts 20mm steel plate to make, riser is offered 5 preformed holes, and a middle hole is for connecting tensioning screw rod, and all the other are for being fixedly connected with screw rod.Tensioning screw rod adopts φ 30mm fining twisted steel to make, and tensioning screw rod left end adopts nut to be fixed on stretch-draw junction steel plate, and tensioning screw rod left end is connected with centre-hole jack and sensor through stretching bed preformed hole.Adopt 50 tons of centre-hole jacks, supporting punching sensor, carry out the test of carbon fiber strengthening with external bonding anchoring property.In order to experimental safe; prevent reinforced concrete rectangular parallelepiped test specimen from after loading, afterbody sticking up; a protection system is set; an angle steel is adopted to push down the afterbody of reinforced concrete rectangular parallelepiped test specimen; the two ends perforate of angle steel also arranges bolt anchor pole, on the anchor rod anchored pedestal being fixed on reinforced concrete testing table of bolt.This test obtains and completes success, test test specimen is carbon fibre material failure mode, demonstrates the stressed reliability of carbon fiber strengthening with external bonding anchorage zone, and test obtains valuable test figure, examine sticking carbon fiber construction quality, demonstrate the rationality of Scheme of Strengthening.
Claims (2)
1. the anchoring property detection experiment device of a carbon fiber strengthening with external bonding, comprise reinforced concrete testing bed, testing stand (1) and test fixture (5), it is characterized in that, described reinforced concrete testing bed, testing stand (1) comprises pedestal (11), gear platform (12), connect platform (13) and stretching bed (14), reinforced concrete testing bed, testing stand (1) adopts Reinforced Concrete Materials primary concreting shaping, reinforced concrete rectangular parallelepiped test specimen (2) is placed on the end face of reinforced concrete testing bed, testing stand (1), and hold out against with the gear platform of reinforced concrete testing bed, testing stand (1), carbon fiber plate testpieces (3) is pasted onto reinforced concrete rectangular parallelepiped test specimen (2) upper surface, piggy-back anchor firmware (4) compresses carbon fiber plate testpieces (3), the afterbody of carbon fiber plate testpieces (3) adopts test fixture (5) clamping, four connecting screw rods (6) are welded on the enclosing cover surface of steel plate of test fixture (5), by connecting screw rod (6), test fixture (5) is connected drawing with stretch-draw junction steel plate (7), the left part of tensioning screw rod (8) is connected with stretch-draw junction steel plate (7) bolt, tensioning screw rod (8) right-hand member is connected with centre-hole jack and sensor (9) through the stretching bed seat preformed hole of reinforced concrete testing bed, testing stand (1).
2. the anchoring property detection experiment device of carbon fiber strengthening with external bonding according to claim 1, it is characterized in that, described test fixture (5) comprises two pieces of enclosing cover steel plates (51), two pieces of inner clip steel plates (53) and the six roots of sensation are to drawing high strength bolt (55), the surface of enclosing cover steel plate (51) arranges serrate strip steel-tooth (52), inner clip steel plate (53) surface-welding pole steel-tooth (54), carbon fiber plate (3) to be placed between upper and lower two pieces of inner clip steel plates (53) and to adopt impregnated structures glue strong bond, upper and lower two pieces of inner clip steel plate (53) arranged outside two pieces of enclosing cover steel plates (51), to drawing high the preformed hole of strength bolt (55) through upper and lower two pieces of enclosing cover steel plates (51), fixture is tightened up, fixture steel bracket (56) supports test fixture (5).
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