CN203231963U - Beam test device for bonding strength of fiber-reinforced composite reinforcement rib material and concrete - Google Patents
Beam test device for bonding strength of fiber-reinforced composite reinforcement rib material and concrete Download PDFInfo
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- CN203231963U CN203231963U CN 201320240866 CN201320240866U CN203231963U CN 203231963 U CN203231963 U CN 203231963U CN 201320240866 CN201320240866 CN 201320240866 CN 201320240866 U CN201320240866 U CN 201320240866U CN 203231963 U CN203231963 U CN 203231963U
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Abstract
The utility model discloses a beam test device for the bonding strength of a fiber-reinforced composite reinforcement rib material and concrete. An FRP (fiber-reinforced plastic)-concrete specimen is subjected to a performance test, wherein an FRP rib is buried inside the FRP-concrete specimen. The device comprises a first steel girder, a second steel girder, distribution girders and two pressure plates; the upper parts of two ends of the first steel girder and the second steel girder are hinged through a steel bar hinge element; meanwhile, the lower ends of the first steel girder and the second steel girder are fixedly connected through a fixed steel plate; the distribution girders are arranged on the first steel girder and the second steel girder; the central axis of the distribution girders passes through the hinge point; the two pressure plates are arranged below the second steel girder; the FRP-concrete specimen is put inside the first steel girder; the FRP rib passes through the hinge end of the first steel girder and extends into a part between the two pressure plates to be fixed. By adopting the device, the initial geometric eccentricity can be removed; the situation that the exerted tension serves as axis stretching load is ensured; the test accuracy is improved.
Description
Technical field
The utility model belongs to the material properties test technical field in fields such as building, bridge, water-cooled and traffic, relates in particular to the test unit of fiber-reinforced composite muscle material and concrete bonding performance.
Background technology
FRP is a kind of novel fibrous composite, has intensity height, in light weight, corrosion-resistant, endurance and the advantage such as convenient of constructing, and has obtained using widely in field of civil engineering.With the reinforcing bar in the FRP muscle replacement reinforced concrete structure, usability and the endurance quality of raising xoncrete structure that will be bigger prolong the serviceable life of xoncrete structure, thereby reduce building structure cost and maintenance cost.Replace reinforcing bar with the FRP muscle, under the outer load effect, the key factor that influences co-operation, compatible deformation between FRP muscle and the concrete is the transmission of cohesive force between FRP muscle and the concrete.For this reason, domestic and international many experts have carried out a large amount of theories and experimental study at FRP muscle and concrete adhesive property.
The composition of FRP muscle and concrete binding power is similar to reinforced concrete structure, and cohesive force mainly contains following three kinds: (1) chemical bond power: the chemisorption power on muscle and the concrete surface also claims bond.This power derives from growth and the sclerosis of the cement crystal of when cast cement slurry in muscle surface seepage and the maintenance processes, thereby makes cement colloid and muscle surface produce the deadlocked effect of adsorbing.This power is generally very little, just disappears when surface of contact takes place to slide relatively, only works in local non-slip region section.(2) friction resistance: after the concrete shrinkage, muscle bonded tightly and the power that produces.Extruding force between muscle and the concrete is more big, and surface of contact is more coarse, and then friction force is more big.The straight muscle of the FRP of light face, after producing slip relatively, cohesive force is mainly from friction resistance.(3) mechanical snap power: the mechanical snap effect that muscle surface irregularity and concrete produce and the power that produces.For surface deformation FRP muscle with ribbing, snap-in force refers to that muscle with ribbing embeds concrete and the mechanical snap effect that forms, and this interlocking is often very big, is the main source of distortion FRP muscle with ribbing and concrete binding power.For the straight muscle of FRP of light face, because the surface is too smooth, during destruction, generally extract destruction based on slippage.For surface deformation FRP muscle with ribbing, generally produce oblique acting force by deformable ribs and concrete squeezing action, skew force can produce tangential component and radial component on the muscle surface, and radial component makes the cross section concrete be in the hoop tension state.When being loaded into certain load; the interface concrete produces internal fissure because of the effect of hoop tension; if concrete cover is thinner; when the hoop tension surpasses concrete tensile strength; form radially in the test specimen-longitudinal crack; this crack, is extended toward free end by loading end radially toward the development of test specimen appearance simultaneously by the muscle surface, causes the concrete cleavage fracture at last.If concrete cover is thicker or the constraint of lateral tie is arranged, the development of radial fissure is restricted, and is unlikely to produce cleavage fracture.But the slippage meeting of muscle significantly increases, along with the continuous weakening of FRP muscle rib and the continuation of slippage, the sliding rupture that finally causes muscle to be pulled out.At present, the adhesion test that has carried out mostly is pull-out test greatly both at home and abroad, and the beam type test is less, and test method is single, and achievement in research has certain limitation.And in the building structure and bridge structure of reality, the FRP muscle is subjected to lacing wire at the bottom of replacing reinforcing bar as beam, and pull-out test and the stressed situation of actual FRP muscle in engineering practice be difference to some extent.Simultaneously, the elastic modulus of FRP is little, is about the 25%-70% of regular reinforcement, and shearing resistance and crush resistance strength are low, make easily in the pull-out test process FRP muscle also when reaching capacity tension stress by pinch off.
As from the foregoing, in research FRP muscle and the test of concrete adhesive property, there are above-mentioned many realistic problems in pull-out test, has hindered the research of FRP muscle and concrete binding performance.Therefore, development is applicable to that the test unit of research FRP muscle and concrete adhesive property has important use and is worth, substitute reinforcing bar for the FRP muscle and be subjected to the xoncrete structure experimental study of lacing wire that the test apparatus of science is provided as beam, have broad application prospects.
Summary of the invention
Goal of the invention: at the problem and shortage of above-mentioned existing existence, the purpose of this utility model provides the beam tester of a kind of fiber-reinforced composite muscle material and concrete bonding intensity, can eliminate the preliminary examination geometric eccentricity by this device, guarantee that the pulling force that applies is the axle center tensile load, improve test accuracy.
Technical scheme: for achieving the above object, the utility model is by the following technical solutions: the beam tester of a kind of fiber-reinforced composite muscle material and concrete bonding intensity, the FRP-concrete sample is carried out performance test, this FRP-concrete sample inside is embedded with the FRP muscle, comprise first girder steel, second girder steel, distribution beam and pressing plate, the top at the two ends of described first girder steel and second girder steel is hinged by the rod iron articulated elements, and the lower end of first girder steel and second girder steel is affixed by fixation steel plate simultaneously; Described distribution beam is located on first girder steel and second girder steel, and central axis passes pin joint; The below of described second girder steel is provided with two block pressur plates; Described FRP-concrete sample is placed in first girder steel, and the FRP muscle passes the hinged end of first girder steel, and stretches between two block pressur plates and fix.
Technique scheme is improved, and the sidewall of corresponding first girder steel of described FRP-concrete sample is provided with tap bolt, and the FRP-concrete sample is carried out the direction finding positioning and fixing; Corresponding first girder steel in FRP-concrete sample top also is provided with tap bolt simultaneously, and carries out fastening to the FRP-concrete sample.
Further, the described first girder steel inner tip is provided with the grooved steel plate, and the tap bolt of described FRP-concrete sample top correspondence passes this grooved steel plate.
Further, the opposite face of two block pressur plates below described second girder steel is provided with the triangle fluting.
Further, described FRP muscle adopts thermoplastic to be fixed between two block pressur plates.
Further, being provided with the grooved support member bottom the described distribution beam is fixed on first girder steel and second girder steel.
Further, described first girder steel and second steel beam bottom are respectively equipped with roller support.
Further, described two block pressur plates are arc near an end of pin joint.
Further, described first girder steel is provided with detachable grooved steel plate away from an end of pin joint.
Beneficial effect: compared with prior art, the utlity model has following advantage:
(1) solution of eccentricity issues in the pull-out test: traditional pull-out test, the pulling force that applies and FRP muscle are difficult to accurately control on same straight line, and reason has: embedding FRP muscle in the concrete sample is because may there be inclination in factors such as construction; During clamping FRP muscle, chuck is suspended from the test specimen top, and experimenter's skilled operation degree will directly influence the situation of aligning; For preventing the slippage of FRP muscle, place two block plates in clamping place of FRP muscle loading end, the deviation of steel plate thickness will cause institute's pulling force of executing and FRP muscle not on same straight line.
For the pulling force that guarantees to apply is the axle center tensile load, the utility model adopts steel plate to clamp the FRP muscle, the FRP muscle is completely fixed, thereby eliminates initial geometric eccentricity.In process of the test, the FRP muscle is tightly fixing by steel plate, thereby what guarantee that the FRP muscle bears is the axle center tensile load.
(2) in the pull-out test with FRP muscle pinch off, be difficult to the solution of anchoring problem: the elastic modulus of FRP muscle is little, shearing resistance and crush resistance strength are low, traditional pull-out test is cut off the FRP muscle easily at loading end, can not be complete measure FRP muscle and concrete adhesive property.This is tested and builds thermoplastic anchoring FRP muscle in the novel employing steel plate, and the cohesive strength of thermoplastic and FRP muscle is higher than the cohesive strength of concrete and FRP muscle, has guaranteed that concrete and the FRP muscle generation slippage anchoring of FRP muscle does not before go wrong.And the length that the FRP muscle links to each other with steel plate is enough, has solved the problem that the FRP muscle is cut off the FRP muscle easily because of local pressure in traditional pull-out test.
(3) traditional center pull-out test and FRP muscle actual loading situation there are differences the solution of problem: in practical project, tension reinforcement at the bottom of the FRP muscle replaces reinforcing bar as beam, and the FRP muscle belongs to central tension in traditional pull-out test, there are differences with the stressing conditions of actual FRP muscle.This tests the experiment of novel employing beam type, matches with actual FRP muscle stressing conditions, and is more convincing to the research of the adhesive property of concrete and FRP muscle.
(4) beam tester takies volume little (220mm * 280mm * 1800mm), can utilize MTS servo-hydraulic testing machine to carry out FRP muscle and concrete binding performance test research, test operation is simple and easy to do.
(5) four of beam tester are subjected to curved test more stable than traditional pull-out test.Simultaneously can be by distance (S) and the deck-molding (h) of control girder steel load(ing) point with bearing, MTS servo-hydraulic testing machine is acted on power (P) amplification of girder steel, and with the acting on the FRP muscle of pulling force, size is (PS/2h).
(6) clear, the simple structure of girder steel design concept adopts stainless steel material to make, and can recycle.Can design many group beam testers by the sectional dimension that changes girder steel, the span of distribution beam, applied widely.
Description of drawings
Fig. 1 is the structural representation of beam tester described in the utility model;
Fig. 2 is the cut-open view of A-A direction among Fig. 1;
Fig. 3 is the cut-open view of B-B direction among Fig. 1;
Fig. 4 is the cut-open view of C-C direction among Fig. 1;
Fig. 5 is the structural representation of first girder steel described in the utility model;
Fig. 6 is the structural representation of second girder steel described in the utility model;
Fig. 7 is the cut-open view of D-D direction among Fig. 5;
Fig. 8 is the cut-open view of E-E direction among Fig. 5;
Fig. 9 is the cut-open view of F-F direction among Fig. 6;
Figure 10 is the cut-open view of G-G direction among Fig. 6.
Wherein, first girder steel 1, second girder steel 2, distribution beam 3, pressing plate 4, rod iron articulated elements 5, fixation steel plate 6, FRP-concrete sample 7, FRP muscle 8, tap bolt 9, grooved steel plate 10, grooved support member 11, roller support 12, detachable grooved steel plate 13, baffle plate 14, hinge bar 15.
Embodiment
Below in conjunction with the drawings and specific embodiments, further illustrate the utility model, should understand these embodiment only is used for explanation the utility model and is not used in restriction scope of the present utility model, after having read the utility model, those skilled in the art all fall within the application's claims institute restricted portion to the modification of the various equivalent form of values of the present utility model.
As shown in Figure 1, the beam tester of a kind of fiber-reinforced composite muscle material and concrete bonding intensity comprises first girder steel, second girder steel, distribution beam and pressing plate.Wherein first girder steel links to each other by the rod iron articulated elements with second girder steel, and the left end of rod iron articulated elements is provided with hinge hole, is provided with hinge bar in the hinge hole, and the rod iron articulated elements is connected with first girder steel by hinge bar; The right-hand member of rod iron articulated elements is fixedlyed connected with second girder steel by a bolt.Distribution beam is positioned at the top of first girder steel and second girder steel, and the lower end of distribution beam is provided with the grooved support member, and the central shaft of distribution beam is through the pin joint of first girder steel.The lower end of first girder steel and second girder steel is provided with fixation steel plate, and fixation steel plate is connected with second girder steel with first girder steel by 2 bolts respectively.Roller bearing lays respectively at the below of first girder steel and second girder steel.The left end of first girder steel is provided with detachable grooved steel plate, and the right-hand member of first girder steel is provided with the baffle plate that has hole that strengthens the first girder steel lateral rigidity, and baffle plate is provided with ribbed stiffener.The FRP-concrete sample is pushed in first girder steel by the left end of first girder steel, and puts bloom at the FRP-concrete sample, and fixes by tap bolt, and tap bolt guarantees its stability by the grooved steel plate.The side of FRP-concrete sample is fixed by tap bolt.The loading end of FRP muscle stretches out the below that enters second girder steel from the first girder steel right side hole, there are two pressing plates that have the triangle fluting below of second girder steel, the loading end of FRP muscle stretches in the notch of pressing plate, two block pressur plates are fixed by bolt and second girder steel up and down, and the left end of pressing plate is done camber.
Wherein first girder steel is assembled by bolt by six blocks of outside steel plates and two blocks of steel plates of putting more energy into, at first process eight block plates, in the assigned address tapping, two blocks of steel plates of putting more energy into are installed in the first girder steel upside steel plate inboard, with baffle plate and ribbed stiffener respectively by bolt in steel plate inboard, the right side of first girder steel.Then with first girder steel up and down and the right side steel plate get up by the bolt assembly unit.The grooved steel plate in first girder steel left side can be dismantled in process of the test, is linked to each other with the last lower steel plate of first girder steel by bolt up and down.Second girder steel is assembled by bolt by six blocks of outside steel plates and two diaphragm plates, at first processes eight block plates, in the assigned address tapping, the front and back side plate is coupled together by left side plate and two diaphragm plates, adopts bolt side plate up and down then.Processing rod iron articulated elements, in the assigned address tapping, rod iron articulated elements left end is connected with first girder steel by hinge hole, hinge bar 2, and right-hand member is connected with second girder steel by four bolts.Fixedly the pressing plate of FRP muscle is sized and is got final product in the assigned address tapping, and pressing plate is connected with second girder steel by eight bolts.The fixed processing steel plate, the left end of fixation steel plate links to each other with first girder steel by two bolts, and right-hand member also links to each other with second girder steel by two bolts, after on-test fixation steel plate is removed.
The test that beam tester of the present utility model carries out FRP muscle and concrete bonding performance may further comprise the steps: (1) device preparatory stage: first girder steel and second girder steel are fixed by rod iron articulated elements and fixation steel plate, distribution beam is fixed on first girder steel and second girder steel by the grooved support member, rolls to chase after to do to lay respectively at first girder steel and second girder steel below; (2) the test specimen preparatory stage: the FRP-concrete sample is pushed in first girder steel by first girder steel left side, and directly over the FRP-concrete sample, put into bloom, tighten fixedly FRP-concrete sample by the upside tap bolt, tighten from the side fixedly FRP-concrete sample in the both sides, front and back of first girder steel by tap bolt simultaneously; FRP muscle loading end is stretched out by the first girder steel right side hole.The FRP muscle that stretches out adopts between two fluting pressing plates at the bottom of thermoplastic is fixed in second girder steel, by eight groups of bolts pressing plate and second girder steel is fixed then.With the grooved steel plate by bolt in the left side of first girder steel to guarantee the integral rigidity of first girder steel.The FRP muscle posts foil gauge in the FRP-concrete sample.The displacement that displacement meter is measured loading end is placed on right side at first girder steel, places displacement meter and measure the free-ended displacement of FRP muscle in first girder steel.The electronics foil gauge is connected to strain acquirement instrument adjusting instrument.(3) experimental stage: fixation steel plate is removed, simultaneously by distribution beam to the combination beam load application, use also record load and displacement of MTS servo-hydraulic testing machine built-in sensors monitoring in real time, use the omnidistance strain of strain acquirement instrument recorded electronic foil gauge.
Claims (9)
1. the beam tester of a fiber-reinforced composite muscle material and concrete bonding intensity, the FRP-concrete sample is carried out performance test, this FRP-concrete sample inside is embedded with the FRP muscle, it is characterized in that: comprise first girder steel, second girder steel, distribution beam and pressing plate, the top at the two ends of described first girder steel and second girder steel is hinged by the rod iron articulated elements, and the lower end of first girder steel and second girder steel is affixed by fixation steel plate simultaneously; Described distribution beam is located on first girder steel and second girder steel, and central axis passes pin joint; The below of described second girder steel is provided with two block pressur plates; Described FRP-concrete sample is placed in first girder steel, and the FRP muscle passes the hinged end of first girder steel, and stretches between two block pressur plates and fix.
2. according to the beam tester of claim 1 described fiber-reinforced composite muscle material and concrete bonding intensity, it is characterized in that: the sidewall of corresponding first girder steel of described FRP-concrete sample is provided with tap bolt, and the FRP-concrete sample is carried out the direction finding positioning and fixing; Corresponding first girder steel in FRP-concrete sample top also is provided with tap bolt simultaneously, and carries out fastening to the FRP-concrete sample.
3. according to the beam tester of claim 2 described fiber-reinforced composite muscle material and concrete bonding intensity, it is characterized in that: the described first girder steel inner tip is provided with the grooved steel plate, and the tap bolt of described FRP-concrete sample top correspondence passes this grooved steel plate.
4. according to the beam tester of claim 1 described fiber-reinforced composite muscle material and concrete bonding intensity, it is characterized in that: the opposite face of two block pressur plates of described second girder steel below is provided with the triangle fluting.
5. according to the beam tester of claim 4 described fiber-reinforced composite muscle material and concrete bonding intensity, it is characterized in that: described FRP muscle adopts thermoplastic to be fixed between two block pressur plates.
6. according to the beam tester of claim 1 described fiber-reinforced composite muscle material and concrete bonding intensity, it is characterized in that: described distribution beam bottom is provided with the grooved support member and is fixed on first girder steel and second girder steel.
7. according to the beam tester of claim 1 described fiber-reinforced composite muscle material and concrete bonding intensity, it is characterized in that: described first girder steel and second steel beam bottom are respectively equipped with roller support.
8. according to the beam tester of claim 1 described fiber-reinforced composite muscle material and concrete bonding intensity, it is characterized in that: described two block pressur plates are arc near an end of pin joint.
9. according to the beam tester of claim 1 described fiber-reinforced composite muscle material and concrete bonding intensity, it is characterized in that: described first girder steel is provided with detachable grooved steel plate away from an end of pin joint.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320240866 CN203231963U (en) | 2013-05-06 | 2013-05-06 | Beam test device for bonding strength of fiber-reinforced composite reinforcement rib material and concrete |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN 201320240866 CN203231963U (en) | 2013-05-06 | 2013-05-06 | Beam test device for bonding strength of fiber-reinforced composite reinforcement rib material and concrete |
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| CN203231963U true CN203231963U (en) | 2013-10-09 |
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| CN 201320240866 Withdrawn - After Issue CN203231963U (en) | 2013-05-06 | 2013-05-06 | Beam test device for bonding strength of fiber-reinforced composite reinforcement rib material and concrete |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103267724A (en) * | 2013-05-06 | 2013-08-28 | 东南大学 | Girder type test device for bonding intensity between fiber-enhanced composite rib material and concrete |
| CN109357937A (en) * | 2018-11-05 | 2019-02-19 | 水利部交通运输部国家能源局南京水利科学研究院 | A kind of measurement device and method describing FRP- concrete binding face fracture toughness |
| CN112444485A (en) * | 2020-11-18 | 2021-03-05 | 福建工程学院 | BFRP-mixed fiber concrete bonding performance test device |
-
2013
- 2013-05-06 CN CN 201320240866 patent/CN203231963U/en not_active Withdrawn - After Issue
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103267724A (en) * | 2013-05-06 | 2013-08-28 | 东南大学 | Girder type test device for bonding intensity between fiber-enhanced composite rib material and concrete |
| CN103267724B (en) * | 2013-05-06 | 2015-11-18 | 东南大学 | The beam tester of fiber-reinforced composite muscle material and concrete bonding intensity |
| CN109357937A (en) * | 2018-11-05 | 2019-02-19 | 水利部交通运输部国家能源局南京水利科学研究院 | A kind of measurement device and method describing FRP- concrete binding face fracture toughness |
| CN109357937B (en) * | 2018-11-05 | 2020-10-30 | 水利部交通运输部国家能源局南京水利科学研究院 | Device and method for describing fracture toughness of FRP (fiber reinforced Plastic) -concrete bonding surface |
| CN112444485A (en) * | 2020-11-18 | 2021-03-05 | 福建工程学院 | BFRP-mixed fiber concrete bonding performance test device |
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Granted publication date: 20131009 Effective date of abandoning: 20151118 |
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| C25 | Abandonment of patent right or utility model to avoid double patenting |