CN109555331A - A kind of anchor structure and construction method promoting beams of concrete Flexural strength efficiency - Google Patents
A kind of anchor structure and construction method promoting beams of concrete Flexural strength efficiency Download PDFInfo
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- CN109555331A CN109555331A CN201811417006.3A CN201811417006A CN109555331A CN 109555331 A CN109555331 A CN 109555331A CN 201811417006 A CN201811417006 A CN 201811417006A CN 109555331 A CN109555331 A CN 109555331A
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- shaped hoop
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04G—SCAFFOLDING; FORMS; SHUTTERING; BUILDING IMPLEMENTS OR AIDS, OR THEIR USE; HANDLING BUILDING MATERIALS ON THE SITE; REPAIRING, BREAKING-UP OR OTHER WORK ON EXISTING BUILDINGS
- E04G23/00—Working measures on existing buildings
- E04G23/02—Repairing, e.g. filling cracks; Restoring; Altering; Enlarging
- E04G23/0218—Increasing or restoring the load-bearing capacity of building construction elements
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Abstract
本发明公开一种提升混凝土梁受弯加固效率的锚固结构和施工方法，锚固结构为配置于FRP底板端部附近的斜向U型箍，每个斜向U型箍由两条FRP条带通过湿粘法对称粘贴于靠近FRP底板端部附近的梁底面和侧面形成，并且所述两条FRP条带相交于混凝土梁底面并与所述FRP底板粘接相连，所述FRP条带末端向上翻折并粘贴于混凝土梁侧面。相对现有技术，本发明技术方案具有施工简单、安全可靠、耐久性好等优点，能够保证FRP底板上的作用力有限传递至斜向U型箍上，从而有效避免FRP受弯加固梁剥离破坏的发生。
The invention discloses an anchoring structure and a construction method for improving the flexural reinforcement efficiency of a concrete beam. The anchoring structure is an oblique U-shaped hoop arranged near the end of an FRP base plate, and each oblique U-shaped hoop is passed through by two FRP strips. The wet bonding method is symmetrically bonded to the bottom surface and side surface of the beam near the end of the FRP base plate, and the two FRP strips intersect with the bottom surface of the concrete beam and are bonded and connected to the FRP base plate, and the ends of the FRP strips are turned up. Folded and glued to the side of the concrete beam. Compared with the prior art, the technical solution of the present invention has the advantages of simple construction, safety and reliability, good durability, etc., and can ensure that the force on the FRP bottom plate is limitedly transmitted to the oblique U-shaped hoop, thereby effectively avoiding the peeling damage of the FRP flexural reinforcement beam. happened.
Description
Technical field
The present invention relates to Reinforcement Technology of Concrete Structure field, in particular to a kind of promotion beams of concrete Flexural strength efficiency
Anchor structure and construction method.
Background technique
Fibre reinforced composites (abbreviation FRP) due to intensity height, light weight, it is corrosion-resistant, the superiority such as can design
Can, it is widely used in concrete structure reinforcement engineering.By FRP sheet material outer patch or the embedding tension portion for being labelled to reinforced beam
Position, the flexural capacity for promoting reinforced beam is principal mode of the FRP applied to reinforced concrete structure reinforcing engineering
One of.
FRP Flexural strength reinforced beam be easy to happen concrete cover stripping damage or middle part stripping damage and
FRP consolidation effect is caused to be greatly reduced, so that FRP material intensity is not fully utilized.When peeling-off destruction, FRP's
Maximum strain (be defined as FRP removing strain) is the 20-50% of its Ultimate Tensile strain, and is far from reaching its Ultimate Tensile and answer
Become.Therefore the generation for seeking effective, convenient and fast additional anchor structure limitation stripping damage, improve FRP rate of utilization of strength and FRP by
Curved reinforcement of rc beam structural behaviour is of great significance to the further application for pushing FRP reinforcement technique.
It is existing research and engineering practice use various forms of additional anchor structures, as metal bolts or metal it is U-shaped hoop with
And the U-shaped hoop of vertical FRP, but above-mentioned additional anchor structure still remains certain deficiency, such as the corrosion resistance of metal additional anchor
It is that can not evade the question, at the same time, some metal additional anchor structures need for bolt to be implanted in concrete toward contact, this
Sample brings very big inconvenience to construction.The vertical U-shaped hoop of FRP is current research and engineering due to having the advantages such as convenient of constructing
The additional anchor structure being most widely used, however, studies have shown that the power on FRP bottom plate is difficult to be transferred to vertical U-shaped hoop, this is right
It is not obvious in the effect of limitation middle part stripping damage.
Summary of the invention
The main object of the present invention be propose a kind of construction is simple, the promotion beams of concrete that safe and reliable, durability is good by
The curved anchor structure for reinforcing efficiency, the present invention also propose that a kind of use promotes the anchor structure of beams of concrete Flexural strength efficiency
Construction method, it is intended to solve FRP Flexural strength reinforced beam and be easy to happen concrete cover stripping damage or middle part
Stripping damage and cause FRP consolidation effect to be greatly reduced so that the problem of FRP material intensity is not fully utilized, to expand
Externally bonded FRP reinforcement reinforcement technique obtains bigger application range in concrete structure reinforcement.
To achieve the above object, the present invention proposes a kind of anchor structure for promoting beams of concrete Flexural strength efficiency, by curved
Beams of concrete bottom surface be provided with FRP bottom plate, FRP bottom plate both ends are respectively equipped with oblique U-shaped hoop and are connected with the FRP bottom plate
And it is pasted on the bottom surface and side of the beams of concrete.
Preferably, the oblique U-shaped hoop is symmetrically pasted on the FRP bottom end by two FRP bands with wet bonding, and two
FRP ribbing cross position described in item is connected with the FRP bottom plate, and the FRP strap end is inclined outwardly and upper fold and pastes
In the beams of concrete side.
Preferably, the FRP band and the beams of concrete central axis oblique are in 45 ° or 30 °.
Preferably, the FRP band is parallelogram like under tiled state, and the end acute angle of the FRP band is
45 ° or 30 °, the internal fiber length direction of the FRP band is parallel with long side.
The present invention also proposes a kind of construction method using the anchor structure, comprising the following steps:
S1: the bottom surface of the beams of concrete and side are subjected to polishing and cleaning treatment；
S2: after beams of concrete dry tack free cleaning, primer is brushed on the beams of concrete surface；
S3: bonding agent is painted on to the FRP band of the oblique U-shaped hoop, infiltrates it sufficiently；
S4: by the FRP band by be symmetrically pasted in a manner of butterfly-like intersection the beams of concrete bottom surface and
Side, two FRP ribbing cross form the oblique U-shaped hoop and intersect at the FRP bottom plate；
S5: the reinforcing of maintenance at least 7 days is carried out in dry environment.
Technical solution of the present invention be mutually bonded by two FRP bands that butterfly shape intersects be connected in beams of concrete bottom surface with
And side carries out encirclement and stirrup to beams of concrete bottom surface and side by oblique U-shaped hoop to form oblique U-shaped hoop, and cooperates
Active force is preferably transferred to oblique U-shaped hoop by the FRP bottom plate for being pasted on beams of concrete bottom surface, to more effectively limit
The end stripping damage and middle part stripping damage of FRP Flexural strength reinforced beam, and effectively promote FRP and added by curved
Gu the structural behaviour of reinforced beam improves the rate of utilization of strength of beams of concrete Flexural strength efficiency and FRP material.
Detailed description of the invention
In order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, to embodiment or will show below
There is attached drawing needed in technical description to be briefly described, it should be apparent that, the accompanying drawings in the following description is only this
Some embodiments of invention for those of ordinary skill in the art without creative efforts, can be with
The structure shown according to these attached drawings obtains other attached drawings.
Fig. 1 is the schematic perspective view of anchor structure of the present invention；
Fig. 2 is the side structure schematic diagram of anchor structure of the present invention；
Fig. 3 is the sectional view in the direction A-A in Fig. 2；
Fig. 4 is test specimen load-displacement curve comparing result figure in the embodiment of the present invention.
Drawing reference numeral explanation:
| Label | Title | Label | Title |
| 1 | Beams of concrete | 3 | Oblique U-shaped hoop |
| 11 | Beams of concrete bottom surface | 31 | FRP band |
| 2 | FRP bottom plate |
The embodiments will be further described with reference to the accompanying drawings for the realization, the function and the advantages of the object of the present invention.
Specific embodiment
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation description, it is clear that described embodiment is only a part of the embodiments of the present invention, instead of all the embodiments.Base
Embodiment in the present invention, it is obtained by those of ordinary skill in the art without making creative efforts it is all its
His embodiment, shall fall within the protection scope of the present invention.
It is to be appreciated that if relating to directionality instruction (such as up, down, left, right, before and after ...) in the embodiment of the present invention,
Then directionality instruction be only used for explain under a certain particular pose (as shown in the picture) between each component relative positional relationship,
Motion conditions etc., if the particular pose changes, directionality instruction is also correspondingly changed correspondingly.
In addition, being somebody's turn to do " first ", " second " etc. if relating to the description of " first ", " second " etc. in the embodiment of the present invention
Description be used for description purposes only, be not understood to indicate or imply its relative importance or implicitly indicate indicated skill
The quantity of art feature." first " is defined as a result, the feature of " second " can explicitly or implicitly include at least one spy
Sign.It in addition, the technical solution between each embodiment can be combined with each other, but must be with those of ordinary skill in the art's energy
It is enough realize based on, will be understood that the knot of this technical solution when conflicting or cannot achieve when occurs in the combination of technical solution
Conjunction is not present, also not the present invention claims protection scope within.
Referring to Figure 1 to Fig. 3, a kind of anchor structure for promoting beams of concrete Flexural strength efficiency of the present invention, each oblique U
Type hoop 3 is symmetrically pasted on the beams of concrete bottom surface 11 near 2 end of FRP bottom plate by two FRP bands 31 by wet bonding
Formed with side, and 31 end of FRP band flips up and be pasted on 1 side of beams of concrete, and with beams of concrete side
Axis oblique is at 45 ° or 30 °.
11 edge of beams of concrete bottom surface of the present embodiment is the circular arc-shaped corner mutual cooperation of arc transition and FRP band 31,
FRP band 31 is damaged to can avoid 1 edge of beams of concrete generation excessive stress.
Preferably, FRP band 31 under tiled state be parallelogram like, 31 end acute angle of FRP band be 45 ° or
30 °, the internal fiber length direction of FRP band 31 is parallel with long side.
Preferably, the oblique U-shaped hoop 3 of the present embodiment include two be respectively shape parallelogram FRP band 31,
Two FRP bands 31 are that butterfly shape intersects at beams of concrete bottom surface 11.
The present invention also proposes a kind of construction method using the anchor structure for promoting beams of concrete Flexural strength efficiency, including
Following steps:
S1: beams of concrete bottom surface 11 and side are subjected to polishing and cleaning treatment；
S2: after the cleaning of 1 dry tack free of beams of concrete, primer is brushed on 1 surface of beams of concrete；
S3: bonding agent is painted on to 31 surface of FRP band of oblique U-shaped hoop 3, infiltrates it sufficiently；
S4: by FRP band 31 by being symmetrically pasted on beams of concrete bottom surface 11 and side in a manner of butterfly-like intersection, two
FRP band 31 is crossed to form oblique U-shaped hoop 3 and intersects at FRP bottom plate 2；
S5: the reinforcing of maintenance at least 7 days is carried out in dry environment.
Embodiment
The present embodiment reinforced beam clear span to be reinforced is 4000mm, is highly 450mm, width 200mm, reinforcing bar
The concrete grade of beams of concrete is C40, and internal longitudinal tensile and compressive reinforcement are all made of the screw thread that two diameters are 12mm
Reinforcing bar, internal shearing resistance stirrup use plain bar and the spacing of diameter 10mm for 100mm.
Tension side thickness of concrete cover (i.e. the distance between armored concrete soffit to stirrup surface) is 40mm,
Compression-side thickness of concrete cover is 30mm.The FRP bottom plate for carrying out Flexural strength to reinforced beam is CFRP, length
For 3800mm, with a thickness of 0.999mm, width 100.0mm.The elasticity modulus of FRP bottom plate is 237GPa, and ultimate tensile strength is
3920MPa, FRP bottom plate both ends are anchored using additional oblique U-shaped hoop, in two pairs of oblique U-shaped hoops and reinforced beam
The angle of mandrel line is 45 °, FRP band with a thickness of 0.666mm, the height calculated from beam bottom is 300mm.Wherein, end is attached
The implementation steps of the oblique U-shaped hoop added include:
(1) after reinforced beam surface is accurately positioned, is drawn lines, using common concrete sander to reinforcing bar
Beams of concrete is surface-treated, and the weak surface layer of reinforced beam is removed, while the concrete that keeps that treated as far as possible
Surfacing；
(2) by removing beams of concrete surface impurity with high pressure water, it is to be processed after surface it is dry through placement at least one day
After dry, reinforced beam surface is dried up with high-pressure pump (air pressure 1.7MPa), guarantees surface cleaning.
(3) primer is painted on armored concrete soffit and side using hairbrush, Dose standard is to cover and make coagulation
Native surface layer is smooth；
(4) infiltration binder is uniformly painted on FRP strip face, and it is made sufficiently to infiltrate FRP band.It is wherein selected
Infiltration binder should be identical as primary coat on reinforced beam surface is brushed or be mutually compatible with so that FRP band can be securely
It is pasted on reinforced beam surface layer；
(5) it will be symmetrically pasted on the bottom surface and side of reinforced beam by two angularly disposed FRP bands, and is in
The butterfly shape of intersection is overlapped in armored concrete soffit, and other ends of FRP band are pasted on reinforced beam upwards
Side；
(6) guarantee that care environments are dry in 24 hours domestic demands of maintenance, proper temperature is maintained at 20 degrees centigrades.
It is curved using 4 points after the present embodiment adds oblique U-shaped hoop to reinforced beam progress performance reinforcing by end
Bent loading method is tested for the property the reinforced beam after reinforcing, and wherein load(ing) point is respectively 1725mm apart from support, and two
Load(ing) point spacing is 750mm.
Fig. 4 is referred to, the present embodiment with the corresponding control test specimen for adding oblique U-shaped hoop without configuration end by carrying out
Comparison discovery:
(1) the control test specimen that end does not configure oblique U-shaped hoop is destroyed removes in middle part, and end configures oblique U-shaped hoop
The middle part stripping damage of test specimen limited very well, destroy in crushing of concrete；
(2) test specimen and the control test specimen load-displacement without configuring the oblique U-shaped hoop in end that end configures oblique U-shaped hoop
Curve comparison as shown in figure 4, compared to control test specimen, configuration end add oblique U-shaped hoop ultimate bearing capacity and the limit across
Middle amount of deflection improves 47% and 229% respectively；
(3) do not have to add the FRP reinforcement of rc beam middle part that oblique U-shaped hoop carries out performance boost using end
The removing strain (destroying maximum strain when occurring on FRP bottom plate) of stripping damage, FRP bottom plate is 5610, is far below the bottom FRP
The Ultimate Tensile strain 13000 of plate；
(4) the FRP reinforcement of rc beam generation FRP bottom plate that oblique U-shaped hoop carries out performance boost is added using end
Rupture failure, the maximum strain measured when destruction on FRP bottom plate are 11127, and the Ultimate Tensile close to FRP bottom plate strains；
The above description is only a preferred embodiment of the present invention, is not intended to limit the scope of the invention, all at this
Under the design of invention, using equivalent structure transformation made by description of the invention and accompanying drawing content, or directly/it is used in it indirectly
He is included in scope of patent protection of the invention relevant technical field.
Claims (5)
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| CN201811417006.3A CN109555331A (en) | 2018-11-26 | 2018-11-26 | A kind of anchor structure and construction method promoting beams of concrete Flexural strength efficiency |
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| CN201811417006.3A CN109555331A (en) | 2018-11-26 | 2018-11-26 | A kind of anchor structure and construction method promoting beams of concrete Flexural strength efficiency |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114753669A (en) * | 2022-04-27 | 2022-07-15 | 华中科技大学 | Combined FRP shearing reinforcement device and application thereof |
| CN115370066A (en) * | 2022-07-06 | 2022-11-22 | 深圳大学 | Concrete member anti-impact reinforcing structure with self-sensing function and manufacturing method |
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| JPH11152907A (en) * | 1997-09-16 | 1999-06-08 | Shimizu Corp | Flexural reinforcement structure and flexural reinforcement method for concrete members |
| CN1523177A (en) * | 2003-09-05 | 2004-08-25 | 重庆交通学院 | Composite reinforced concrete beam containing crack resistant reinforcement layer and method for making same |
| CN101691817A (en) * | 2009-09-14 | 2010-04-07 | 华东交通大学 | Method for additionally anchoring reinforced concrete beam strengthened with FRP cloth material in anti-bending way |
| CN202672048U (en) * | 2012-06-15 | 2013-01-16 | 上海久坚加固工程有限公司 | Fiber reinforce plastic (FRP) cloth anchoring system consolidating reinforced concrete girder |
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| CN206418790U (en) * | 2017-01-21 | 2017-08-18 | 湖南城市学院 | A kind of fiber cloth reinforced reinforced beam structural member |
| CN107795141A (en) * | 2017-10-09 | 2018-03-13 | 广东工业大学 | A kind of the FRP reinforced steel concretes plate and reinforcement means of the oblique press strip of strap end portion |
| CN209723682U (en) * | 2018-11-26 | 2019-12-03 | 广东工业大学 | A kind of anchor structure promoting beams of concrete Flexural strength efficiency |
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2018
- 2018-11-26 CN CN201811417006.3A patent/CN109555331A/en active Pending
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH11152907A (en) * | 1997-09-16 | 1999-06-08 | Shimizu Corp | Flexural reinforcement structure and flexural reinforcement method for concrete members |
| CN1523177A (en) * | 2003-09-05 | 2004-08-25 | 重庆交通学院 | Composite reinforced concrete beam containing crack resistant reinforcement layer and method for making same |
| CN101691817A (en) * | 2009-09-14 | 2010-04-07 | 华东交通大学 | Method for additionally anchoring reinforced concrete beam strengthened with FRP cloth material in anti-bending way |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114753669A (en) * | 2022-04-27 | 2022-07-15 | 华中科技大学 | Combined FRP shearing reinforcement device and application thereof |
| CN115370066A (en) * | 2022-07-06 | 2022-11-22 | 深圳大学 | Concrete member anti-impact reinforcing structure with self-sensing function and manufacturing method |
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