CN111677187A - Composite longitudinal bar-winding grid stirrup reinforced concrete beam and preparation method thereof - Google Patents
Composite longitudinal bar-winding grid stirrup reinforced concrete beam and preparation method thereof Download PDFInfo
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- CN111677187A CN111677187A CN202010425279.3A CN202010425279A CN111677187A CN 111677187 A CN111677187 A CN 111677187A CN 202010425279 A CN202010425279 A CN 202010425279A CN 111677187 A CN111677187 A CN 111677187A
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04C—STRUCTURAL ELEMENTS; BUILDING MATERIALS
- E04C3/00—Structural elongated elements designed for load-supporting
- E04C3/02—Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces
- E04C3/20—Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces of concrete or other stone-like material, e.g. with reinforcements or tensioning members
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04C—STRUCTURAL ELEMENTS; BUILDING MATERIALS
- E04C5/00—Reinforcing elements, e.g. for concrete; Auxiliary elements therefor
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Abstract
The invention discloses a composite longitudinal bar-winding grid stirrup reinforced concrete beam and a preparation method thereof, wherein the concrete beam comprises a concrete part and a concrete internal framework, the concrete internal framework comprises a longitudinal bar component, a longitudinal bar positioning component and a grid stirrup component, the longitudinal bar component comprises four FRP composite longitudinal bars, and the longitudinal bar positioning component comprises at least two longitudinal bar positioning rectangular stirrups; the grid stirrup component comprises at least two FRP composite material winding grid stirrups, and each FRP composite material winding grid stirrup is formed by winding an FRP grid on the periphery of the longitudinal bar component; the concrete beam is convenient to construct, good in durability and excellent in mechanical property. The preparation method comprises the following steps: a. weaving an FRP grid; b. positioning and fixing the FRP composite longitudinal bars; c. winding an FRP grid; d. gluing; e. pouring concrete; the preparation method can effectively prepare the composite material longitudinal bar-winding grid stirrup reinforced concrete beam.
Description
Technical Field
The invention relates to the technical field of constructional engineering, in particular to a composite longitudinal bar-winding grid stirrup reinforced concrete beam and a preparation method thereof.
Background
In a reinforced concrete structure, the stirrups play a series of roles of shearing resistance, torsion resistance, crack resistance, main reinforcement fixation, longitudinal reinforcement buckling prevention, core concrete restraint and the like. Fiber Reinforced Polymers (FRP) is a novel material with the advantages of light weight, high strength, corrosion resistance and the like, and has wide application space in the fields of aviation, ships and engineering; the light high-strength fiber reinforced composite material molding reinforcement material is used as the stirrup, so that the performance of the stirrup can be greatly improved, and the performance of the reinforced concrete member with the FRP is improved; compared with the traditional steel stirrup, the FRP stirrup has the advantages of excellent corrosion resistance, high tensile strength, light weight and the like, and is particularly suitable for concrete structures in severe environments such as bridges, hydraulic engineering and the like.
However, the FRP bars have low shear strength and are prone to bending and shear failure; for the FRP stirrups, the performance degradation of the FRP reinforcements is obvious at the stirrup bending position, and the adverse effect can be brought to the shearing resistance of the beam; through a series of analyses to the FRP stirrup, the FRP stirrup has the following problems, specifically:
1. the FRP reinforcement has low elastic modulus, and under the same load condition, the FRP stirrup generates larger strain than the steel stirrup, so that the beam member has overlarge deformation;
2. the FRP ribs have low shear strength and are easy to bend and shear damage, and the performance of the bending area of the FRP stirrup is obviously degraded;
3. when the FRP stirrups bear large load for a long time in a severe environment, the FRP stirrups are aged and creep, and the working performance of the concrete beam component is reduced along with the continuous development of the damage of the FRP stirrups;
4. the FRP material has large difference of longitudinal and transverse thermal expansion coefficients, and the FRP stirrups have large longitudinal and transverse deformation difference under the action of temperature difference load, thereby generating adverse effect on the performance of the FRP stirrups and reducing the shearing resistance of the whole concrete member.
Disclosure of Invention
The invention aims to provide a composite material longitudinal bar-winding grid stirrup reinforced concrete beam aiming at the defects of the prior art, which has the advantages of convenient construction, good durability and excellent mechanical property.
The invention also aims to provide a preparation method of the composite longitudinal bar-winding grid stirrup reinforced concrete beam, which can effectively prepare the composite longitudinal bar-winding grid stirrup reinforced concrete beam, and the prepared composite longitudinal bar-winding grid stirrup reinforced concrete beam is convenient to construct, good in durability and excellent in mechanical property.
In order to achieve the above object, the present invention is achieved by the following technical solutions.
A composite longitudinal bar-winding grid stirrup reinforced concrete beam comprises a concrete beam main body, wherein the concrete beam main body comprises a concrete part and a concrete internal framework positioned inside the concrete part, and the concrete part and the concrete internal framework are poured into an integral structure;
the concrete internal framework comprises a longitudinal bar component, a longitudinal bar positioning component and a grid stirrup component, wherein the longitudinal bar component comprises four FRP composite longitudinal bars which are arranged at intervals and respectively extend along the longitudinal direction of the concrete beam main body; the grid stirrup component comprises at least two FRP composite material winding grid stirrups which are sequentially arranged along the concrete beam main body at intervals in the longitudinal direction, each FRP composite material winding grid stirrup is formed by winding an FRP grid on the periphery of the longitudinal reinforcement component, the FRP grid is a grid structure formed by weaving the FRP reinforcement material by adopting a fiber bundle weaving process, and each FRP composite material winding grid stirrup is integrally bonded with each FRP composite material longitudinal reinforcement through high-strength impregnating compound.
The FRP composite material winding grid stirrup is formed by winding the FRP grid on at least two layers of the periphery of the longitudinal bar component.
And the FRP composite material is wound on the vertical FRP ribs in the grid stirrups and aligned.
The FRP composite material is wound on the vertical FRP ribs in the grid stirrups and is longitudinally and equidistantly distributed along the concrete beam main body, and each vertical FRP rib is respectively vertical to the longitudinal direction of the concrete beam main body; or the vertical FRP ribs in the FRP composite material winding grid stirrups are arranged along the longitudinal variable pitch of the concrete beam main body, and each vertical FRP rib extends obliquely respectively.
The longitudinal bar positioning rectangular stirrup is of a rectangular stirrup structure formed by bending a steel bar; or the longitudinal rib positioning rectangular stirrup is a rectangular stirrup structure which is formed by sequentially bonding four FRP rib material ends into a rectangular full-enclosure shape, and the included angle between two adjacent FRP rib materials is 90 degrees.
A preparation method of a composite longitudinal bar-winding grid stirrup reinforced concrete beam comprises the following steps:
a. weaving the FRP rib material into an FRP grid by adopting a fiber bundle weaving process;
b. positioning and fixing all FRP composite longitudinal bars in a longitudinal bar assembly through a longitudinal bar positioning assembly, wherein the longitudinal bar assembly comprises four FRP composite longitudinal bars which are arranged at intervals and respectively extend along the longitudinal direction of a concrete beam main body, the longitudinal bar positioning assembly comprises at least two longitudinal bar positioning rectangular stirrups which are sequentially arranged at intervals along the longitudinal direction of the concrete beam main body, and each FRP composite longitudinal bar is bound and fixed by the longitudinal bar positioning rectangular stirrups;
c. winding at least two layers of FRP grids on the periphery of the longitudinal bar component to form FRP composite material winding grid stirrups, winding at least two FRP composite material winding grid stirrups which are arranged at intervals on the periphery of the longitudinal bar component, and cutting redundant parts according to the anchoring length requirement of the FRP composite material winding grid stirrups;
d. each FRP composite material winding grid stirrup is bonded with each FRP composite material longitudinal bar into a whole through high-strength impregnating compound so as to finish the preparation of the concrete internal framework;
e. positioning the concrete internal framework in a concrete pouring mould, pouring concrete in the concrete pouring mould to form a concrete part, and curing to obtain the composite longitudinal bar-winding grid stirrup reinforced concrete beam.
And c, when the FRP grid is wound to form the FPR composite material winding grid stirrup, applying prestress to the FRP grid to ensure that the FPR composite material winding grid stirrup is straight, and ensuring that the FPR composite material winding grid stirrup is attached to the FRP composite material longitudinal reinforcement.
The FRP composite material is wound on the vertical FRP ribs in the grid stirrups and is longitudinally and equidistantly distributed along the concrete beam main body, and each vertical FRP rib is respectively vertical to the longitudinal direction of the concrete beam main body; or the vertical FRP ribs in the FRP composite material winding grid stirrups are arranged along the longitudinal variable pitch of the concrete beam main body, and each vertical FRP rib extends obliquely respectively.
The longitudinal bar positioning rectangular stirrup is of a rectangular stirrup structure formed by bending a steel bar; or the longitudinal rib positioning rectangular stirrup is a rectangular stirrup structure which is formed by sequentially bonding four FRP rib material ends into a rectangular full-enclosure shape, and the included angle between two adjacent FRP rib materials is 90 degrees.
After the FRP composite material winding grid stirrups are bonded with each FRP composite material longitudinal bar into a whole through high-strength impregnating adhesive, sand blasting treatment is carried out on the surfaces of the FRP composite material winding grid stirrups.
The invention has the beneficial effects that: the invention relates to a composite longitudinal bar-winding grid stirrup reinforced concrete beam which comprises a concrete beam main body, wherein the concrete beam main body comprises a concrete part and a concrete internal framework positioned in the concrete part, and the concrete part and the concrete internal framework are poured into an integral structure; the concrete internal framework comprises a longitudinal bar component, a longitudinal bar positioning component and a grid stirrup component, wherein the longitudinal bar component comprises four FRP composite longitudinal bars which are arranged at intervals and respectively extend along the longitudinal direction of the concrete beam main body; the grid stirrup component comprises at least two FRP composite material winding grid stirrups which are sequentially arranged along the concrete beam main body at intervals in the longitudinal direction, each FRP composite material winding grid stirrup is formed by winding an FRP grid on the periphery of the longitudinal reinforcement component, the FRP grid is a grid structure formed by weaving the FRP reinforcement material by adopting a fiber bundle weaving process, and each FRP composite material winding grid stirrup is integrally bonded with each FRP composite material longitudinal reinforcement through high-strength impregnating compound. Through the structural design, the composite longitudinal bar-winding grid stirrup reinforced concrete beam has the advantages of convenience in construction, good durability and excellent mechanical property.
The invention has the following beneficial effects: the invention relates to a preparation method of a composite longitudinal bar-winding grid stirrup reinforced concrete beam, which comprises the following steps: a. weaving the FRP rib material into an FRP grid by adopting a fiber bundle weaving process; b. positioning and fixing all FRP composite longitudinal bars in a longitudinal bar assembly through a longitudinal bar positioning assembly, wherein the longitudinal bar assembly comprises four FRP composite longitudinal bars which are arranged at intervals and respectively extend along the longitudinal direction of a concrete beam main body, the longitudinal bar positioning assembly comprises at least two longitudinal bar positioning rectangular stirrups which are sequentially arranged at intervals along the longitudinal direction of the concrete beam main body, and each FRP composite longitudinal bar is bound and fixed by the longitudinal bar positioning rectangular stirrups; c. winding at least two layers of FRP grids on the periphery of the longitudinal bar component to form FRP composite material winding grid stirrups, winding at least two FRP composite material winding grid stirrups which are arranged at intervals on the periphery of the longitudinal bar component, and cutting redundant parts according to the anchoring length requirement of the FRP composite material winding grid stirrups; d. each FRP composite material winding grid stirrup is bonded with each FRP composite material longitudinal bar into a whole through high-strength impregnating compound so as to finish the preparation of the concrete internal framework; e. positioning the concrete internal framework in a concrete pouring mould, pouring concrete in the concrete pouring mould to form a concrete part, and curing to obtain the composite longitudinal bar-winding grid stirrup reinforced concrete beam. Through the steps, the preparation method can effectively prepare the composite material longitudinal bar-winding grid stirrup reinforced concrete beam, and the prepared composite material longitudinal bar-winding grid stirrup reinforced concrete beam is convenient to construct, good in durability and excellent in mechanical property.
Drawings
The invention will be further described with reference to the drawings to which, however, the embodiments shown in the drawings do not constitute any limitation.
Fig. 1 is a schematic structural view of a composite longitudinal bar-winding grid stirrup reinforced concrete beam.
Fig. 2 is a schematic structural view of an FRP grid.
FIG. 3 is a schematic structural view of the FRP composite longitudinal bar of the present invention when it is positioned and fixed.
Fig. 4 is a schematic view when winding the FRP grid.
Fig. 5 is a schematic view of another mode of winding the FRP grid.
Fig. 6 is a schematic structural view of the concrete internal frame of the present invention.
Fig. 1 to 6 include:
1-concrete Beam body 2-concrete part
3-concrete internal framework 4-FRP composite longitudinal bar
5-longitudinal reinforcement positioning rectangular stirrup 6-FRP composite material winding grid stirrup
61-FRP grid.
Detailed Description
The present invention will be described below with reference to specific embodiments.
As shown in fig. 1, the composite longitudinal bar-winding grid stirrup reinforced concrete beam comprises a concrete beam main body 1, wherein the concrete beam main body 1 comprises a concrete part 2 and a concrete internal framework 3 positioned inside the concrete part 2, and the concrete part 2 and the concrete internal framework 3 are poured into an integral structure.
As shown in fig. 1 and 6, the concrete internal framework 3 comprises a longitudinal bar assembly, a longitudinal bar positioning assembly and a grid stirrup assembly, wherein the longitudinal bar assembly comprises four FRP composite longitudinal bars 4 which are arranged at intervals and respectively extend along the longitudinal direction of the concrete beam main body 1, the longitudinal bar positioning assembly comprises at least two longitudinal bar positioning rectangular stirrups 5 which are sequentially arranged at intervals along the longitudinal direction of the concrete beam main body 1, and each FRP composite longitudinal bar 4 is bound and fixed with the longitudinal bar positioning rectangular stirrup 5; the grid stirrup component comprises at least two FRP composite material winding grid stirrups 6 which are sequentially arranged along the concrete beam main body 1 at intervals in the longitudinal direction, each FRP composite material winding grid stirrup 6 is formed by winding an FRP grid 61 on the periphery of the longitudinal reinforcement component, as shown in figures 1, 2, 4, 5 and 6, the FRP grid 61 is a grid structure formed by weaving the FRP reinforcement material by adopting a fiber bundle weaving process, and each FRP composite material winding grid stirrup 6 is bonded with each FRP composite material longitudinal reinforcement 4 into a whole through high-strength impregnating adhesive.
Preferably, the FRP composite material winding grid stirrup 6 is formed by winding the FRP grating 61 around at least two layers of the periphery of the longitudinal bar assembly, and the vertical FRP bars in the FRP composite material winding grid stirrup 6 are aligned.
It should be further explained that, as shown in fig. 4, the vertical FRP reinforcements in the FRP composite material wound grid stirrup 6 are arranged equidistantly along the longitudinal direction of the concrete beam main body 1, and each vertical FRP reinforcement is perpendicular to the longitudinal direction of the concrete beam main body 1; or, as shown in fig. 5, the vertical FRP reinforcements in the FRP composite material wound grid stirrup 6 are arranged along the concrete beam main body 1 in a longitudinally variable manner, and each vertical FRP reinforcement extends obliquely.
It should be further noted that the longitudinal reinforcement positioning rectangular stirrup 5 is a rectangular stirrup structure formed by bending a reinforcing steel bar; or, the longitudinal rib positioning rectangular stirrup 5 is a rectangular stirrup structure which is formed by sequentially bonding four FRP rib material ends into a rectangular full-enclosure shape, and the included angle between two adjacent FRP rib materials is 90 degrees.
The composite material longitudinal bar-winding grid stirrup reinforced concrete beam can be prepared by the following preparation method, and specifically, the preparation method of the composite material longitudinal bar-winding grid stirrup reinforced concrete beam comprises the following steps:
a. weaving the FRP rib material into an FRP grid 61 by adopting a fiber bundle weaving process;
b. positioning and fixing all FRP composite longitudinal bars 4 in a longitudinal bar assembly through a longitudinal bar positioning assembly, wherein the longitudinal bar assembly comprises four FRP composite longitudinal bars 4 which are arranged at intervals and respectively extend along the longitudinal direction of a concrete beam main body 1, the longitudinal bar positioning assembly comprises at least two longitudinal bar positioning rectangular stirrups 5 which are sequentially arranged at intervals along the longitudinal direction of the concrete beam main body 1, and each FRP composite longitudinal bar 4 is bound and fixed with the longitudinal bar positioning rectangular stirrups 5 respectively;
c. winding the FRP grid 61 on at least two layers of the periphery of the longitudinal bar component to form an FRP composite material winding grid stirrup 6, winding at least two FRP composite materials arranged at intervals on the periphery of the longitudinal bar component to wind the grid stirrup 6, and cutting redundant parts according to the anchoring length requirement of the FRP composite material winding grid stirrup 6;
d. each FRP composite material winding grid stirrup 6 is bonded with each FRP composite material longitudinal bar 4 into a whole through high-strength impregnating compound so as to complete the preparation of the concrete internal framework 3;
e. positioning the concrete internal framework 3 in a concrete pouring mould, pouring concrete in the concrete pouring mould to form a concrete part 2, and curing to obtain the composite longitudinal bar-winding grid stirrup reinforced concrete beam; wherein, among the concreting process, pay attention to the protection FPR combined material winding net stirrup, with concrete placement in no FPR combined material winding net stirrup department, carry out the concrete filling through vibrating, guarantee that FPR combined material winding net stirrup and concrete bond well.
Wherein, in step c, when winding FRP grid 61 in order to form the compound material winding net stirrup of FPR, exert prestressing force in order to guarantee that the compound material winding net stirrup of FPR is straight to FRP grid 61, and guarantee that the compound material winding net stirrup of FPR and the compound material longitudinal reinforcement 4 laminating of FRP to reach and guarantee that the compound material winding net stirrup of FPR can be with the compound material longitudinal reinforcement 4 of FRP atress warp.
In addition, after the FRP composite material winding grid stirrups 6 are bonded with each FRP composite material longitudinal bar 4 into a whole through high-strength impregnating glue, sand blasting treatment is carried out on the surfaces of the FRP composite material winding grid stirrups 6 so as to improve the friction force between the FRP composite material winding grid stirrups 6 and the concrete, and further the bonding acting force between the FRP composite material winding grid stirrups 6 and the concrete part 2 can be improved;
compared with the traditional steel reinforced concrete beam and FRP reinforced concrete beam, the composite longitudinal bar-winding grid stirrup reinforced concrete beam has the advantages that:
1. the FRP composite material grid stirrup formed by winding the FRP grid 61 has the characteristics of high durability, corrosion resistance, light weight and high strength, is particularly suitable for a seawater and sea sand concrete structure, and can effectively resist the erosion of chloride ions; considering that fresh water river sand resources are increasingly exhausted, the development of a seawater and sea sand concrete structure is imperative, and the method has a wide application prospect and accords with the national development strategy;
2. the FPR composite material grid stirrup formed by winding the FRP grid 61 can be cut on site, and construction is convenient, so that labor cost and time cost can be effectively reduced;
3. compared with the traditional FRP formed stirrup, the FRP composite material winding grid stirrup 6 has better mechanical property, the mechanical property degradation of the FRP formed stirrup in a bending area is avoided, and the integral working performance of a beam member is facilitated;
4. compared with FRP molding stirrups, the FRP composite grid stirrups have lower production cost, are favorable for saving materials due to excellent mechanical properties, and have better economy;
5. the FRP composite material grid stirrup can be formed by winding a plurality of layers of FRP grids 61, and calculation and selection are carried out according to the actual beam size and the stress condition;
6. gluing and positioning the multi-layer FRP composite grid stirrup through high-strength impregnating adhesive to form a whole with the longitudinal bar;
7. after the hooping of the grid of the multi-layer FRP composite material grid is glued, the stressed fiber bundles can be stressed cooperatively, so that the integrity is better;
8. after the hooping of the grid of the multi-layer FRP composite material grid is glued, the fiber bundle and the concrete have better cooperative deformation capability;
9. in the process of engineering manufacture of the FRP grid 61, the variable-strength FRP grid 61 can be formed by adjusting the fiber amount of different fiber bundles, namely, the working performance of the component can be improved in a targeted manner according to the shearing force change of the component;
10. in the manufacturing process of the FRP composite material grid stirrup, the angle of a stressed fiber bundle is adjusted, and the variable pitch inclined grid stirrup shown in figure 5 can enable the stressed angle of the fiber bundle to be the same as the tensile stress angle of concrete of a component, so that the working performance of the component is improved to the maximum extent;
11. the installation, the fixed, the cross process of multilayer FRP combined material grid net stirrup need pay attention to the adjustment of net hole position, and at the winding in-process, FRP combined material grid net stirrup will guarantee that vertical tow aligns, guarantees to cooperate between the different tow.
From the above situation, through the structural design, the composite longitudinal bar-winding grid stirrup reinforced concrete beam has the advantages of convenience in construction, good durability and excellent mechanical property. The preparation method of the composite longitudinal bar-winding grid stirrup reinforced concrete beam can effectively prepare the composite longitudinal bar-winding grid stirrup reinforced concrete beam, and the prepared composite longitudinal bar-winding grid stirrup reinforced concrete beam is convenient to construct, good in durability and excellent in mechanical property.
The above description is only a preferred embodiment of the present invention, and for those skilled in the art, the present invention should not be limited by the description of the present invention, which should be interpreted as a limitation.
Claims (10)
1. The utility model provides a reinforced concrete beam of longitudinal reinforcement of combined material-winding net stirrup which characterized in that: the concrete beam comprises a concrete beam main body (1), wherein the concrete beam main body (1) comprises a concrete part (2) and a concrete internal framework (3) positioned inside the concrete part (2), and the concrete part (2) and the concrete internal framework (3) are poured into an integral structure;
the concrete internal framework (3) comprises a longitudinal bar component, a longitudinal bar positioning component and a grid stirrup component, wherein the longitudinal bar component comprises four FRP composite longitudinal bars (4) which are arranged at intervals and respectively extend along the longitudinal direction of the concrete beam main body (1), the longitudinal bar positioning component comprises at least two longitudinal bar positioning rectangular stirrups (5) which are sequentially arranged at intervals along the longitudinal direction of the concrete beam main body (1), and each FRP composite longitudinal bar (4) is bound and fixed with the longitudinal bar positioning rectangular stirrups (5) respectively; the grid stirrup component comprises at least two FRP composite material winding grid stirrups (6) which are longitudinally arranged along the concrete beam main body (1) at intervals in sequence, each FRP composite material winding grid stirrup (6) is formed by winding an FRP grid (61) on the periphery of the longitudinal reinforcement component respectively, the FRP grid (61) is a grid structure formed by weaving the FRP reinforcement material by adopting a fiber bundle weaving process, and each FRP composite material winding grid stirrup (6) is integrally bonded with each FRP composite material longitudinal reinforcement (4) through high-strength impregnating adhesive respectively.
2. The composite longitudinal bar-wound grid hoop reinforced concrete beam as claimed in claim 1, wherein: the FRP composite material winding grid stirrup (6) is formed by winding the FRP grid (61) on at least two layers of the periphery of the longitudinal bar component.
3. The composite longitudinal bar-wound grid hoop reinforced concrete beam as claimed in claim 2, wherein: the FRP composite material is wound on the vertical FRP ribs in the grid stirrups (6) and aligned.
4. A composite longitudinal bar-wound grid hoop reinforced concrete beam as claimed in claim 3, wherein: vertical FRP (fiber reinforced Plastic) reinforcements in the FRP composite material winding grid stirrups (6) are longitudinally and equidistantly distributed along the concrete beam main body (1), and each vertical FRP reinforcement is perpendicular to the longitudinal direction of the concrete beam main body (1); or the vertical FRP ribs in the FRP composite material winding grid stirrups (6) are arranged along the longitudinal variable pitch of the concrete beam main body (1), and each vertical FRP rib extends obliquely respectively.
5. The composite longitudinal bar-wound grid hoop reinforced concrete beam as claimed in claim 1, wherein: the longitudinal reinforcement positioning rectangular stirrup (5) is of a rectangular stirrup structure formed by bending a reinforcing steel bar; or the longitudinal rib positioning rectangular stirrup (5) is a rectangular stirrup structure which is formed by sequentially bonding four FRP rib material tails into a rectangular full-enclosure shape, and the included angle between two adjacent FRP rib materials is 90 degrees.
6. A preparation method of a composite longitudinal bar-winding grid stirrup reinforced concrete beam is characterized by comprising the following steps:
a. weaving the FRP rib material into an FRP grid (61) by adopting a fiber bundle weaving process;
b. positioning and fixing all FRP composite longitudinal bars (4) in a longitudinal bar assembly through a longitudinal bar positioning assembly, wherein the longitudinal bar assembly comprises four FRP composite longitudinal bars (4) which are arranged at intervals and respectively extend along the longitudinal direction of a concrete beam main body (1), the longitudinal bar positioning assembly comprises at least two longitudinal bar positioning rectangular stirrups (5) which are sequentially arranged at intervals along the longitudinal direction of the concrete beam main body (1), and each FRP composite longitudinal bar (4) is bound and fixed with the longitudinal bar positioning rectangular stirrups (5) respectively;
c. winding an FRP grid (61) on at least two layers of the periphery of the longitudinal bar component to form an FRP composite material winding grid stirrup (6), winding at least two FRP composite material winding grid stirrups (6) which are arranged at intervals on the periphery of the longitudinal bar component, and cutting redundant parts according to the anchoring length requirement of the FRP composite material winding grid stirrup (6);
d. each FRP composite material winding grid stirrup (6) is bonded with each FRP composite material longitudinal bar (4) into a whole through high-strength impregnating adhesive so as to complete the preparation of the concrete internal framework (3);
e. and positioning the concrete internal framework (3) in a concrete pouring mould, pouring concrete into the concrete pouring mould to form a concrete part (2), and curing to obtain the composite longitudinal bar-winding grid stirrup reinforced concrete beam.
7. The method for preparing the composite longitudinal bar-winding grid hoop reinforced concrete beam as claimed in claim 6, wherein: in the step c, when the FRP grid (61) is wound to form the FPR composite material winding grid stirrup, prestress is applied to the FRP grid (61) to ensure that the FPR composite material winding grid stirrup is straight, and the FPR composite material winding grid stirrup is attached to the FRP composite material longitudinal rib (4).
8. The method for preparing the composite longitudinal bar-winding grid hoop reinforced concrete beam as claimed in claim 6, wherein: vertical FRP (fiber reinforced Plastic) reinforcements in the FRP composite material winding grid stirrups (6) are longitudinally and equidistantly distributed along the concrete beam main body (1), and each vertical FRP reinforcement is perpendicular to the longitudinal direction of the concrete beam main body (1); or the vertical FRP ribs in the FRP composite material winding grid stirrups (6) are arranged along the longitudinal variable pitch of the concrete beam main body (1), and each vertical FRP rib extends obliquely respectively.
9. The method for preparing the composite longitudinal bar-winding grid hoop reinforced concrete beam as claimed in claim 6, wherein: the longitudinal reinforcement positioning rectangular stirrup (5) is of a rectangular stirrup structure formed by bending a reinforcing steel bar; or the longitudinal rib positioning rectangular stirrup (5) is a rectangular stirrup structure which is formed by sequentially bonding four FRP rib material tails into a rectangular full-enclosure shape, and the included angle between two adjacent FRP rib materials is 90 degrees.
10. The method for preparing the composite longitudinal bar-winding grid hoop reinforced concrete beam as claimed in claim 6, wherein: after the FRP composite material winding grid stirrups (6) are bonded with each FRP composite material longitudinal rib (4) into a whole through high-strength impregnating adhesive, sand blasting treatment is carried out on the surfaces of the FRP composite material winding grid stirrups (6).
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010425279.3A CN111677187A (en) | 2020-05-19 | 2020-05-19 | Composite longitudinal bar-winding grid stirrup reinforced concrete beam and preparation method thereof |
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| CN202010425279.3A CN111677187A (en) | 2020-05-19 | 2020-05-19 | Composite longitudinal bar-winding grid stirrup reinforced concrete beam and preparation method thereof |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114135057A (en) * | 2021-11-30 | 2022-03-04 | 东莞理工学院 | Device and method for testing reinforcement framework, beam component and performance |
| CN117721955A (en) * | 2023-08-22 | 2024-03-19 | 南京工业大学 | Winding forming FRP combined stirrup concrete structure |
-
2020
- 2020-05-19 CN CN202010425279.3A patent/CN111677187A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114135057A (en) * | 2021-11-30 | 2022-03-04 | 东莞理工学院 | Device and method for testing reinforcement framework, beam component and performance |
| CN117721955A (en) * | 2023-08-22 | 2024-03-19 | 南京工业大学 | Winding forming FRP combined stirrup concrete structure |
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