CN116163470A - FRP reinforced UHPC board shear-resistant reinforced concrete beam and installation method thereof - Google Patents
FRP reinforced UHPC board shear-resistant reinforced concrete beam and installation method thereof Download PDFInfo
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- CN116163470A CN116163470A CN202310149148.0A CN202310149148A CN116163470A CN 116163470 A CN116163470 A CN 116163470A CN 202310149148 A CN202310149148 A CN 202310149148A CN 116163470 A CN116163470 A CN 116163470A
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- 239000011150 reinforced concrete Substances 0.000 title claims abstract description 43
- 238000000034 method Methods 0.000 title claims abstract description 21
- 238000009434 installation Methods 0.000 title abstract description 7
- 239000004567 concrete Substances 0.000 claims abstract description 60
- 238000010008 shearing Methods 0.000 claims abstract description 23
- 239000000463 material Substances 0.000 claims abstract description 22
- 238000005728 strengthening Methods 0.000 claims abstract description 10
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- 239000000853 adhesive Substances 0.000 claims description 11
- 230000001070 adhesive effect Effects 0.000 claims description 11
- 238000004519 manufacturing process Methods 0.000 claims description 9
- 239000000203 mixture Substances 0.000 claims description 7
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicon dioxide Inorganic materials O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 6
- 239000004568 cement Substances 0.000 claims description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 4
- 239000006004 Quartz sand Substances 0.000 claims description 3
- 239000003638 chemical reducing agent Substances 0.000 claims description 3
- 230000002708 enhancing effect Effects 0.000 claims description 3
- 239000000843 powder Substances 0.000 claims description 3
- 239000010453 quartz Substances 0.000 claims description 3
- 229910021487 silica fume Inorganic materials 0.000 claims description 3
- 238000007711 solidification Methods 0.000 claims description 3
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- 229920002748 Basalt fiber Polymers 0.000 claims description 2
- 229920000049 Carbon (fiber) Polymers 0.000 claims description 2
- 229920006231 aramid fiber Polymers 0.000 claims description 2
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- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 claims description 2
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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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B28—WORKING CEMENT, CLAY, OR STONE
- B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
- B28B13/00—Feeding the unshaped material to moulds or apparatus for producing shaped articles; Discharging shaped articles from such moulds or apparatus
- B28B13/02—Feeding the unshaped material to moulds or apparatus for producing shaped articles
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
- C04B28/02—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing hydraulic cements other than calcium sulfates
-
- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04C—STRUCTURAL ELEMENTS; BUILDING MATERIALS
- E04C5/00—Reinforcing elements, e.g. for concrete; Auxiliary elements therefor
- E04C5/07—Reinforcing elements of material other than metal, e.g. of glass, of plastics, or not exclusively made of metal
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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
- E04G21/00—Preparing, conveying, or working-up building materials or building elements in situ; Other devices or measures for constructional work
- E04G21/14—Conveying or assembling building elements
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2201/00—Mortars, concrete or artificial stone characterised by specific physical values
- C04B2201/50—Mortars, concrete or artificial stone characterised by specific physical values for the mechanical strength
- C04B2201/52—High compression strength concretes, i.e. with a compression strength higher than about 55 N/mm2, e.g. reactive powder concrete [RPC]
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/91—Use of waste materials as fillers for mortars or concrete
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Abstract
The invention provides an FRP reinforced UHPC plate shear strengthening reinforced concrete beam and an installation method thereof, wherein the FRP reinforced UHPC plate shear strengthening reinforced concrete beam comprises the following components: concrete beams, FRP planks and UHPC boards; the concrete beam is provided with two shearing areas and a pure bending area, the pure bending area is positioned between the two shearing areas, and at least two channels are respectively arranged on two opposite side surfaces of the shearing areas; the FRP lath comprises an FRP connecting part embedded in the channel and an FRP fixing part fixed in the UHPC plate, wherein the FRP connecting part and the FRP fixing part are integrally constructed, so that the UHPC plate is fixed on the side surface of the concrete beam and the shear strength of the concrete beam is improved. The FRP reinforced UHPC board shear strengthening concrete beam combines the advantages of the FRP material and the UHPC material in actual use, and the manufactured FRP-UHPC board has high strength, high toughness and high durability, is not only material-saving and low-carbon, but also is particularly suitable for complex application scenes such as ocean corrosion and the like.
Description
Technical Field
The invention relates to the technical field of civil engineering structure reinforcement, in particular to an FRP reinforced UHPC plate shearing-resistant reinforced concrete beam and an installation method thereof.
Background
China has entered the age of late town generation where new construction, update and maintenance are repeated. The carbon emission of the building accounts for 45% of the emission of the whole industry, wherein the largest proportion is in the building operation and maintenance stage. The reinforced concrete frame structure has a large quantity and wide range, and consists of beams, columns and nodes, the RC beams are updated and maintained through an effective method, the stress performance of the RC beams is improved, the service life of the RC beams is prolonged, and the sustainable development of the building industry can be promoted.
Reinforced Concrete (RC) beams are widely used in civil engineering fields such as house construction and bridge construction. With the increase of service time, particularly in complex engineering environments such as marine corrosion, the RC beam is often insufficient in shear bearing capacity due to degradation of environmental corrosion material performance, so that the safety of a main structure of a building is threatened, and therefore, the RC beam needs to be maintained in time.
The level of structural reinforcement depends on the material use and technical means. At present, more RC beam shearing reinforcement methods exist. The traditional reinforcing methods such as increasing the cross section, replacing concrete, wrapping steel and the like have the defects of poor durability, long construction period, large environmental influence and the like, and are particularly unsuitable for complex environments such as marine corrosion and the like. The FRP materials popular in the last 20 years are light, high in strength and good in corrosion resistance, but the externally-adhered FRP cloth is easy to peel off from the reinforced concrete base body, and the reinforcing effect is affected. In recent years, the rapidly growing fiber reinforced cement-based composite material (Engineered cementitious composite, ECC; ultra-high performance concrete, UHPC) has the characteristics of high strength, high durability and the like, is an ideal material for structural reinforcement, and injects new vitality for structural reinforcement. The shear strength of the RC beam can be improved by the ECC layer or the UHPC layer reinforcing method, but the tensile strength of the ECC or the UHPC material is still limited, so that the shear-resistant reinforcing effect of the ECC or the UHPC material is affected. Increasing the thickness, while increasing its overall tensile strength, increases costs and affects space usage and architectural aesthetics. Meanwhile, the defects of high material cost, unsatisfactory bonding effect of the reinforcing layer and the matrix and the like exist.
Therefore, the invention provides the FRP reinforced UHPC board shear strengthening reinforced concrete beam and the installation method thereof.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide an FRP reinforced UHPC plate shear strengthening reinforced concrete beam and an installation method thereof.
A FRP reinforced UHPC board shear-resistant reinforced concrete beam comprises
Concrete beams, FRP planks and UHPC boards;
the concrete beam is provided with two shearing cross areas and a pure bending area, the pure bending area is positioned between the two shearing cross areas, and at least two channels are respectively arranged on two opposite side surfaces of the shearing cross areas;
the FRP lath comprises an FRP connecting part embedded in the channel and an FRP fixing part fixed in the UHPC plate, wherein the FRP connecting part and the FRP fixing part are integrally constructed, so that the UHPC plate is fixed on the side surface of the concrete beam and is used for improving the shear strength of the concrete beam.
On the basis of the above scheme and as a preferable scheme of the above scheme: the UHPC board is fixed on the side surface of the shearing cross area in a covering way; the height of the UHPC plate is the same as the height of the concrete beam, and the thickness t of the UHPC plate is as follows u In the range of 15-30mm.
On the basis of the above scheme and as a preferable scheme of the above scheme: the length of the FRP slat is the same as the height of the UHPC board, the width b of the FRP slat f The thickness t of the FRP lath ranges from 20 mm to 35mm f The range is 2-6 mm.
On the basis of the above scheme and as a preferable scheme of the above scheme: the center distance between adjacent channels at one side of the concrete beam ranges from 100 mm to 200mm, and the depth of the channels in the thickness direction of the UHPC board is as follows: (b) f -t u 2+3) mm, the channel width of the channel in the length direction of the UHPC board is 2t f And (t) f +6mm) larger.
The method for installing the FRP reinforced UHPC board shear strengthening reinforced concrete beam comprises the following steps:
prefabricating an FRP-UHPC precast slab for enhancing the shear strength of a concrete beam, wherein at least two FRP connecting parts extend out of the FRP-UHPC precast slab;
connecting areas are respectively arranged on two sides of the concrete beam, and a channel corresponding to each FRP connecting part is chiseled in each connecting area;
and the FRP connecting part of each FRP-UHPC precast slab extends out is embedded in the corresponding channel, so that the reinforced fixed connection between the FRP-UHPC precast slab and the concrete is realized.
On the basis of the above scheme and as a preferable scheme of the above scheme: the FRP-UHPC precast slab comprises the following specific manufacturing steps:
prefabricating FRP battens;
determining the size of the UHPC board according to the required requirement, determining the number of the required prefabricated FRP strips, manufacturing a corresponding die of the UHPC board, pouring the stirred UHPC material into a die plate, and embedding the prefabricated FRP strips into the UHPC mixture;
and (5) waiting for solidification of the UHPC material, and finishing manufacturing of the FRP-UHPC precast slab.
On the basis of the above scheme and as a preferable scheme of the above scheme: the length of the FRP lath is the same as the height of the UHPC board, the width direction of the FRP lath is perpendicular to the connecting side face of the UHPC board, the FRP lath is embedded with the mixture along the width direction of the UHPC board, the FRP lath is uniformly distributed on the UHPC board, and the interval between the adjacent FRP laths is not more than 200mm.
On the basis of the above scheme and as a preferable scheme of the above scheme: the UHPC material is prepared by mixing cement, silica fume, quartz powder, quartz sand, a water reducing agent, steel fibers and the like, the compressive strength is not lower than 120MPa, the steel fiber content is 2% -4%, the steel fiber length is 6-12mm, and the steel fiber diameter is 0.15-0.4mm.
On the basis of the above scheme and as a preferable scheme of the above scheme:
after a channel is drilled on the concrete beam, cleaning the channel and cleaning the side surface of the concrete beam;
filling the channel with a structural adhesive, and uniformly smearing the structural adhesive on the side surface of the concrete beam;
embedding an FRP connecting part into the channel;
and finally tightly compacting the connecting side surface of the UHPC board and the corresponding reinforced concrete beam side surface.
On the basis of the above scheme and as a preferable scheme of the above scheme: the FRP lath adopts basalt fiber, carbon fiber, glass fiber or aramid fiber.
Compared with the prior art, the invention has the following beneficial effects:
1. the FRP reinforced UHPC board shear strengthening concrete beam combines the advantages of the FRP material and the UHPC material, and the manufactured FRP-UHPC board has high strength, high toughness and high durability, is not only material-saving and low-carbon, but also is particularly suitable for complex application scenes such as ocean corrosion and the like.
2. The method for installing the FRP reinforced UHPC board shear-resistant reinforced concrete beam has good bonding performance by utilizing the semi-exposed FRP lath embedded reinforcement technology, solves the problem of easy interfacial debonding caused by bonding between the externally attached reinforcement layer and the matrix only by one plane, and can effectively improve the shear strength of the concrete beam.
3. The method for installing the FRP reinforced UHPC board shear reinforced concrete beam can prefabricate the FRP-UHPC board in engineering, ensure the construction quality of the FRP-UHPC board, and install the FRP-UHPC board on the concrete beam in an assembly mode on site, is efficient and quick in construction, has small influence on surrounding environment, and can be used for various complex engineering environments.
Drawings
Other features, objects and advantages of the present invention will become more apparent upon reading of the detailed description of non-limiting embodiments, given with reference to the accompanying drawings in which:
fig. 1 is a perspective view schematically showing the overall structure of an FRP-reinforced UHPC board 3 shear-reinforced concrete beam 1 of the present invention;
fig. 2 is a perspective view illustrating the whole structure of the concrete beam 1 of the present invention;
FIG. 3 is a perspective view of the UHPC board 3 of the present invention;
FIG. 4 is a schematic front view of the FRP slat 2 of the present invention;
FIG. 5 is a perspective view schematically showing a structure of the bonding and splicing of a plurality of FRP laths 2 of the present invention;
FIG. 6 is a perspective view schematically showing an FRP-UHPC prefabricated plate 4 of the present invention;
FIG. 7 is a perspective view schematically showing another structure of the FRP-UHPC prefabricated plate 4 of the present invention;
FIG. 8 is a schematic flow chart diagram of a method for installing an FRP reinforced UHPC plate shear reinforced concrete beam;
FIG. 9 is a schematic diagram showing a specific flow of step S100 of the present invention;
FIG. 10 is a flowchart illustrating the step S300 of the present invention;
fig. 11 is a schematic view of a concrete beam according to the present invention.
In the figure: 1. a concrete beam; 2. FRP laths; 3. UHPC board; 4. FRP-UHPC precast slab; 5. a channel.
Detailed Description
The following description and the discussion of the embodiments of the present invention will be made more complete and less in view of the accompanying drawings, in which it is to be understood that the invention is not limited to the embodiments of the invention disclosed and that it is intended to cover all such modifications as fall within the scope of the invention.
In the description of the present invention, it should be noted that the positional or positional relationship indicated by the terms such as "upper", "lower", "inner", "outer", "top/bottom", etc. are based on the positional or positional relationship shown in the drawings, are merely for convenience of describing the present invention and simplifying the description, and do not indicate or imply that the apparatus or elements referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "configured to," "engaged with," "connected to," and the like are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present invention will be understood in specific cases by those of ordinary skill in the art.
In order to facilitate understanding of the embodiments of the present invention, the present application will be described in detail below with reference to fig. 1 to 11 of the specification, and specific embodiments are further illustrated as examples, and the embodiments do not constitute limitations on the embodiments of the present invention.
Embodiment one;
referring to fig. 1 and 11, an FRP reinforced UHPC board shear-resistant reinforced concrete beam, comprising: a concrete beam 1, FRP laths 2 and UHPC plates 3; at least two channels 5 are respectively arranged on two sides of the concrete beam 1; the FRP lath 2 comprises an FRP connecting part embedded in the channel and an FRP fixing part fixed in the UHPC plate 3, wherein the FRP connecting part and the FRP fixing part are integrally constructed, so that the UHPC plate 3 is fixed on the side surface of the concrete beam 1 to improve the shear strength of the concrete beam 1. The FRP reinforced UHPC plate 3 shear-resistant reinforced concrete beam 1 combines the advantages of FRP materials and UHPC materials in actual use, and the manufactured FRP-UHPC plate 3 has high strength, high toughness and high durability, is not only material-saving and low-carbon, but also is particularly suitable for complex application scenes such as ocean corrosion and the like.
Referring to fig. 1 and 2 and 6, in the specific example of the present embodiment, six FRP strips 2 are provided on each UHPC board 3; the concrete beam is provided with two shearing cross areas and a pure bending area, the pure bending area is positioned between the two shearing cross areas, two opposite side surfaces of the shearing cross areas are respectively provided with a connecting area, each connecting area is correspondingly connected with a UHPC board 3, each connecting area is provided with six channels 5, the spacing between the adjacent channels 5 is the same, andthe center distance between adjacent channels is 100-200 mm, and the depth of the channels in the thickness direction of the UHPC board 3 is as follows: (b) f -t u 2+3) mm, each channel 5 in each connection zone corresponds to an FRP connection of one FRP slat 2 on the UHPC board 3. Thickness t of UHPC board 3 u In the range of 15-30mm; the channel width of the channel in the length direction of the UHPC board 3 is 2t f And (t) f +6mm) larger. In this application, the height of the UHPC board 3 is the same as the height of the concrete beam 1, and the UHPC board is covered and fixed on the side of the shearing area, in practical use, during reinforcement, the UHPC board covers the shearing area, and the shearing area (the distance from the central load acting point on the concrete beam to the edge of the support) is longer or shorter, generally more than 1000 mm.
One specific example in practical use: the dimensions of the concrete beam 1 in this embodiment are length x width x height: 2500mm by 250mm by 500mm, with a shear span ratio of 1.6; referring to fig. 3, the dimensions of the UHPC board 3 are selected as length x width x thickness: 1000mm x 500mm x 30mm; the dimensions of the FRP strip 22 are selected as length x width x thickness: 500 mm. Times.25 mm. Times.6 mm. It should be noted that, in the actual manufacture of the present application, the shape and the size of an ultra-high performance concrete (UHPC) slab are determined according to the size, the reinforcement, the load applied, and the like of the beam to be reinforced, and the number and the size of the fiber reinforced composite (FRP) slabs are further determined, which are not particularly limited herein. It should be noted that, referring to fig. 5, the FRP panel 22 is formed by gluing three FRP panels 22 having a thickness of 2mm.
Referring to fig. 7, a specific example of the present application is applicable to the shear reinforcement of the concrete beam 11 in the case of a small shear span ratio, four uniformly distributed FRP strips 2 are provided on the side surface of the UHPC board 3 in the prefabricated FRP-UHPC precast slab 44, and the corresponding side surface of the concrete beam 11 is provided with a channel 5 corresponding to the connection portion of each FRP strip 2. It should be noted that the small shear span ratio in the present application is not more than 2.0.
Example two
Referring to fig. 8, a method for installing an FRP reinforced UHPC board shear-resistant reinforced concrete beam includes the steps of:
step S100: and prefabricating FRP-UHPC precast slabs 4 for enhancing the shear strength of the concrete beam 1, wherein at least two FRP connecting parts extend out of the FRP-UHPC precast slabs 4.
Referring to fig. 9, the specific prefabrication step of step S100 in this embodiment is as follows:
step S110: prefabricating FRP laths 2;
step S120: determining the size of the UHPC board 3 according to the required requirement, determining the number of the required prefabricated FRP strips 2, manufacturing corresponding dies of the UHPC board 3, pouring the stirred UHPC material into a die plate, and embedding the prefabricated FRP strips 2 into the UHPC mixture;
step S130: and (5) waiting for solidification of the UHPC material, and finishing manufacturing of the FRP-UHPC precast slab 4. It should be noted that, the height of the FRP batten 2 manufactured in this embodiment is the same as the height of the UHPC board 3, the length direction of the FRP batten 2 is perpendicular to the connection side of the UHPC board 3, the length of the FRP batten 2 is embedded with the mixture along the width direction of the UHPC board 3, the width direction of the FRP batten 2 is perpendicular to the surface of the UHPC board 3, the FRP battens 2 are uniformly distributed on the UHPC board 3, and the interval between the adjacent FRP battens 2 is not more than 200mm. The UHPC material is prepared by mixing cement, silica fume, quartz powder, quartz sand, a water reducing agent, steel fibers and the like, the compressive strength is not lower than 120MPa, the steel fiber content is 2% -4%, the steel fiber length is 6-12mm, and the steel fiber diameter is 0.15-0.4mm.
The application provides a specific casting dimension, wherein the dimensions of the concrete beam 1 are length x width x height: 2500mm by 250mm by 500mm, with a shear span ratio of 1.6; the dimensions of the UHPC board 3 are chosen as length x width x thickness: 1000 mm. Times.500 mm. Times.30 mm. As shown in fig. 3: the dimensions of the FRP strip 2 are selected as length x width x thickness: 500 mm. Times.25 mm. Times.6 mm.
Step S200: connecting areas are respectively arranged on two sides of the concrete beam 1, and a channel 5 corresponding to each FRP connecting part is chiseled in the connecting areas.
Step S300: the FRP connecting part of each FRP-UHPC precast slab 4 extending out is embedded in the corresponding channel 5, so that the reinforced and fixed connection between the FRP-UHPC precast slabs 4 and the concrete is realized.
Referring to fig. 10, the specific steps of step S300 in this embodiment are as follows:
step S310: after a channel is drilled on the concrete beam, cleaning the channel and cleaning the side surface of the concrete beam;
step S320: filling the channel with a structural adhesive, and uniformly smearing the structural adhesive on the side surface of the concrete beam;
it should be noted that the thickness of the adhesive in this embodiment is 3mm.
In this case, the reinforced UHPC board 3 reinforced by the FRP batten 2 is arranged on the side of the shearing area of the reinforced concrete beam 11. Firstly, filling structural adhesive in the channel, uniformly coating the structural adhesive on the beam surface, then embedding the exposed part of the FRP lath 2 on the FRP-UHPC precast slab 4 into the channel of the reinforced concrete beam 1, tightly compacting the FRP-UHPC precast slab 4 until the adhesive overflows, and finally removing the overflowed adhesive. The installation is completed as shown in fig. 1.
Step S330: embedding the FRP connecting piece into the channel 5;
step S340: the connection side of the UHPC board 3 is tightly compacted with the corresponding side of the concrete beam 1.
Step S350: FRP in this application refers to fiber reinforced composite, UHPC refers to ultra-high performance concrete, FRP plank 22 refers to fiber reinforced composite plank, UHPC plank 33 refers to ultra-high performance concrete plank, and FRP-UHPC precast plank 44 refers to ultra-high performance concrete plank embedded in FRP plank 22.
It should be noted that, referring to fig. 11, in this embodiment, the concrete beam 1 has a shear cross region and a pure bending region, wherein the UHPC board 3 is reinforced at the side of the shear cross region, in the actual installation process, the floating dust on the surface of the concrete beam 1 needs to be washed first, then a gouging channel 5 is opened along the beam height direction at the side of the shear cross region of the reinforced concrete beam 1, and finally, the surface of the concrete beam 1 and the gouging channel 5 are washed by using a cleaning tool such as a high-pressure water gun to remove concrete fragments.
In this embodiment, as shown in fig. 5, the arrangement mode is that the height of the FRP lath 22 is embedded with the mixture along the width direction of the UHPC board 33, the length direction of the FRP lath 22 is vertical to the surface of the UHPC board 33, the embedded depth is 15mm, the distance is 150mm, and the FRP lath 22 is uniformly distributed in the UHPC board 33. The positions and the number of the channels 55 on the concrete beam 11 are in one-to-one correspondence with the FRP laths 22 on the UHPC board 33, the center distance between the adjacent channels 55 is 150mm, the height of the channels 55 is 500mm, the depth of the channels 55 is 13mm, and the width of the channels 55 is 12mm. The specific parameters of the present application are defined according to the dimensions of the reinforced concrete beam 11, the reinforcement, the load applied, and the like, and are not particularly limited. The foregoing describes specific embodiments of the present invention. It is to be understood that the invention is not limited to the particular embodiments described above, and that various changes or modifications may be made by those skilled in the art within the scope of the appended claims without affecting the spirit of the invention. The embodiments of the present application and features in the embodiments may be combined with each other arbitrarily without conflict.
Claims (10)
1. An FRP reinforced UHPC board shear-resistant reinforced concrete beam, comprising: concrete beams, FRP planks and UHPC boards;
the concrete beam is provided with two shearing cross areas and a pure bending area, the pure bending area is positioned between the two shearing cross areas, and at least two channels are respectively arranged on two opposite side surfaces of the shearing cross areas;
the FRP lath comprises an FRP connecting part embedded in the channel and an FRP fixing part fixed in the UHPC plate, wherein the FRP connecting part and the FRP fixing part are integrally constructed, so that the UHPC plate is fixed on the side surface of the concrete beam and is used for improving the shear strength of the concrete beam.
2. The FRP reinforced UHPC board shear strengthening reinforced concrete beam of claim 1, wherein the UHPC board is secured to the shear cross-zone side by a covering;
the height of the UHPC plate is the same as the height of the concrete beam, and the thickness t of the UHPC plate is as follows u In the range of 15-30mm.
3. The FRP reinforced UHPC board shear-resistant reinforced concrete beam of claim 2, wherein the FRP strip has the same length as the UHPC board and the width b of the FRP strip f The thickness t of the FRP lath ranges from 20 mm to 35mm f The range is 2-6 mm.
4. The FRP reinforced UHPC board shear strengthening reinforced concrete beam of claim 3, wherein the center-to-center distance between adjacent channels on one side of the concrete beam is 100-200 mm, and the depth of the channels in the thickness direction of the UHPC board is: (b) f -t u 2+3) mm, the channel width of the channel in the length direction of the UHPC board is 2t f And (t) f +6mm) larger.
5. The method for installing the FRP reinforced UHPC board shear strengthening reinforced concrete beam is characterized by comprising the following steps of:
prefabricating an FRP-UHPC precast slab for enhancing the shear strength of a concrete beam, wherein at least two FRP connecting parts extend out of the FRP-UHPC precast slab;
connecting areas are respectively arranged on two sides of the concrete beam, and a channel corresponding to each FRP connecting part is chiseled in each connecting area;
and the FRP connecting part of each FRP-UHPC precast slab extends out is embedded in the corresponding channel, so that the reinforced fixed connection between the FRP-UHPC precast slab and the concrete is realized.
6. The method for installing the FRP reinforced UHPC plate shearing resistant reinforced concrete beam according to claim 5, wherein the FRP-UHPC precast slab comprises the following concrete manufacturing steps:
prefabricating FRP battens;
determining the size of the UHPC board according to the required requirement, determining the number of the required prefabricated FRP strips, manufacturing a corresponding die of the UHPC board, pouring the stirred UHPC material into a die plate, and embedding the prefabricated FRP strips into the UHPC mixture;
and (5) waiting for solidification of the UHPC material, and finishing manufacturing of the FRP-UHPC precast slab.
7. The method for installing the FRP reinforced UHPC plate shearing-resistant reinforced concrete beam according to claim 5, wherein the length of the FRP lath is the same as the height of the UHPC plate, the width direction of the FRP lath is perpendicular to the connecting side surface of the UHPC plate, the FRP lath is embedded with the mixture along the width direction of the UHPC plate, the FRP laths are uniformly distributed on the UHPC plate, and the interval between the adjacent FRP laths is not more than 200mm.
8. The method for installing the FRP reinforced UHPC plate shearing resistant reinforced concrete beam according to claim 6, wherein the UHPC material is prepared by mixing cement, silica fume, quartz powder, quartz sand, a water reducing agent, steel fibers and the like, the compressive strength is not lower than 120MPa, the steel fiber content is 2% -4%, the steel fiber length is 6-12mm, and the steel fiber diameter is 0.15-0.4mm.
9. The method for installing an FRP-reinforced UHPC board shear-resistant reinforced concrete beam of claim 6, wherein after a channel is gouged in the concrete beam, the channel is cleaned and the concrete beam sides are cleaned;
filling the channel with a structural adhesive, and uniformly smearing the structural adhesive on the side surface of the concrete beam;
embedding an FRP connecting part into the channel;
and finally tightly compacting the connecting side surface of the UHPC board and the corresponding reinforced concrete beam side surface.
10. The method for installing the FRP reinforced UHPC plate shearing resistant reinforced concrete beam as set forth in claim 6, wherein said FRP lath is basalt fiber, carbon fiber, glass fiber or aramid fiber.
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