CN109680871A - A kind of compound cross-section simply supported beam and preparation method thereof - Google Patents
A kind of compound cross-section simply supported beam and preparation method thereof Download PDFInfo
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- CN109680871A CN109680871A CN201910079922.9A CN201910079922A CN109680871A CN 109680871 A CN109680871 A CN 109680871A CN 201910079922 A CN201910079922 A CN 201910079922A CN 109680871 A CN109680871 A CN 109680871A
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- Prior art keywords
- simply supported
- supported beam
- normal concrete
- layer
- compound cross
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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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- 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
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A30/00—Adapting or protecting infrastructure or their operation
- Y02A30/30—Adapting or protecting infrastructure or their operation in transportation, e.g. on roads, waterways or railways
Abstract
The invention discloses a kind of compound cross-section simply supported beams and preparation method thereof, it solves the problems, such as that reinforced concrete simple-supported beam is due to being caused internal reinforcement corrosion by curved cracking, influencing structural-load-carrying capacity in the prior art, by cement-base composite material in conjunction with normal concrete, the ductility and overall durability of component are improved；Its technical solution are as follows: the ECC layer including normal concrete layer and on the outside of it is combined into the simply supported beam of a rectangular section by side interface between ECC layers and normal concrete layer, the bottom interface between ECC layers and normal concrete layer is laid with unsticking layer；The normal concrete layer is internally provided with for the framework of steel reinforcement as support.
Description
Technical field
The present invention relates to civil construction fields more particularly to a kind of compound cross-section simply supported beam and preparation method thereof.
Background technique
Currently, reinforced concrete simple-supported beam is widely used in civil construction industry, but since concrete has resistance to compression
Functional, flexural tensile strength is lower, and poor toughness, brittleness is big, and ultimate tensile strength is smaller, the uncontrollable feature in crack, so that steel
Reinforced concrete simply supported beam in normal use all in the state of work with cracking, this for it is some do not allow to occur crack or
Fracture width, which has, to be difficult to meet use condition for the works of strict demand.Meanwhile the presence in crack to have
Evil substance is able to penetrate into inside concrete, and concrete durability is caused to destroy, so can make reinforcing bar in simply supported beam directly with have
Evil medium joint, especially for some outdoor structures and the structure being in wet environment, in nuisances such as acid, chloride ions
Under the action of matter, rebar surface is gradually corroded because of oxidation, and gradually toward in-house development, volume is swollen during steel bar corrosion
Swollen to be easy to for surrounding concrete protective layer being split up, forming longitudinal crack even will cause Surface layer's concrete and falls off, further plus
The corrosion of fast internal reinforcing bar.
Under the influence of oxidation corrosion effect, the forced area of internal steel bar stress is also gradually reduced, and is split due to longitudinal
The presence of seam, and the adhesive surface of concrete and Reinforcement can be made to be destroyed, cohesive force is reduced, holding for component is made
Carrying power reduces, and structure overall stiffness can also decline to a great extent, and leverages the normal use performance and security performance of structure.Separately
On the one hand, since reinforcing bar and modulus of elasticity of concrete difference are huge, this also allows for the two and deforms difference in stress, when
When reinforced concrete simple-supported beam stress occurs bending and deformation, since concrete in tension intensity is lower, so lower in stress level
When will crack, the tensile stress of cracking position will be individually born by longitudinal tensile reinforcing bar at this time, and part tensile stress needs logical
It crosses interfacial adhesion and continues to transmit to concrete parts, easily cause generate phase between reinforcing bar and concrete in this course
To sliding, cause longitudinal splitting crack and concrete scaling, influences the overall performance of simply supported beam.
Therefore, it is necessary to which the crack to reinforced concrete structure is controlled.
Summary of the invention
For overcome the deficiencies in the prior art, the present invention provides a kind of compound cross-section simply supported beams and preparation method thereof, will
Cement-base composite material improves the ductility and overall durability of component in conjunction with normal concrete.
The present invention adopts the following technical solutions:
A kind of compound cross-section simply supported beam, the ECC layer including normal concrete layer and on the outside of it, ECC layers are mixed with common
The simply supported beam of a rectangular section is combined between solidifying soil layer by side interface, between ECC layers and normal concrete layer
Bottom interface is laid with unsticking layer；
The normal concrete layer is internally provided with for the framework of steel reinforcement as support.
Further, the unsticking layer is polytetrafluoroethylene film.
Further, the framework of steel reinforcement includes longitudinal stress muscle and longitudinal bearing rod, and longitudinal stress muscle and longitudinal direction erect
It is connected between muscle by several spaced stirrups.
Further, the longitudinal bearing rod is set to above longitudinal stress muscle, longitudinal stress muscle and longitudinal bearing rod difference
Together with stirrup binding.
Further, abdomen muscle is disposed between the framework of steel reinforcement two sides longitudinal stress muscle and longitudinal bearing rod.
Further, the abdomen muscle and stirrup are bound together.
Further, the longitudinal stress muscle is parallel to each other and vertical with stirrup respectively with longitudinal bearing rod.
Further, ECC layers of the thickness is within the scope of one times of protective layer thickness of normal concrete layer, protective layer thickness
Specifically determined by local environment and actual design requirement.
A kind of production method of compound cross-section simply supported beam, comprising the following steps:
Step (1) assembling reinforcement skeleton, and and in the fixing mould at the reinforcing bar 5-10 millimeter of outside, pour common coagulation
Soil conserves setting time；
Step (2) is laid with polytetrafluoroethylene film in normal concrete layer top surface；
Step (3) is placing template at normal concrete layer side setting thickness, and pours ECC layers；
Step (4) carries out standard curing processing to compound cross-section simply supported beam.
Further, in the step (3), template is placed at one times away from normal concrete side protective layer thickness, is protected
Covering thickness is determined by local environment and actual design requirement.
Compared with prior art, the beneficial effects of the present invention are:
(1) by the present invention in that with ECC material tensile region part substitute normal concrete, improve the ductility of component with
And overall durability；
(2) present invention is laid with polytetrafluoroethylene film between ECC layers and normal concrete layer and carries out unsticking, prevents ECC
Internally normal concrete layer develops in layer tensile region crack, and two kinds of materials of ECC and normal concrete are given full play to respectively
From the advantages of；And pour ECC in side and to bond between ECC layers and normal concrete layer even closer, it ensure that structure
Intensity and overall stability；
(3) compound cross-section simply supported beam simple structure of the invention, function admirable, easy for construction, compared to normal concrete
Beam has better economic use value.
Detailed description of the invention
The accompanying drawings constituting a part of this application is used to provide further understanding of the present application, and the application's shows
Meaning property embodiment and its explanation are not constituted an undue limitation on the present application for explaining the application.
Schematic diagram is poured when Fig. 1 is present invention production；
Fig. 2 is cross-sectional view of the invention；
Fig. 3 is schematic longitudinal section of the invention；
Wherein, 1, ECC layers；2, normal concrete layer；3, stirrup；4, longitudinal stress muscle；5, longitudinal bearing rod；6, abdomen muscle；
7, polytetrafluoroethylene film；8, die trial is poured.
Specific embodiment
It is noted that following detailed description is all illustrative, it is intended to provide further instruction to the application.Unless another
It indicates, all technical and scientific terms used herein has usual with the application person of an ordinary skill in the technical field
The identical meanings of understanding.
Fiber reinforced cement-based composite material (Engineered Cementitious Composite-ECC) is that one kind is adopted
Use polyvinyl alcohol (PVA) fiber as reinforcing material, using cement mortar as the composite material of matrix.
It should be noted that term used herein above is merely to describe specific embodiment, and be not intended to restricted root
According to the illustrative embodiments of the application.As used herein, unless the context clearly indicates otherwise, otherwise singular
Also it is intended to include plural form, additionally, it should be understood that, when in the present specification using term "comprising" and/or " packet
Include " when, indicate existing characteristics, step, operation, device, component and/or their combination.
As background technique is introduced, exist in the prior art reinforced concrete simple-supported beam due to being caused by curved cracking in
Portion's reinforcement corrosion, the deficiency for influencing structural-load-carrying capacity, in order to solve technical problem as above, present applicant proposes a kind of compound
Section simply supported beam and preparation method thereof and preparation method thereof.
In a kind of typical embodiment of the application, as shown in Figure 1-Figure 3, a kind of compound cross-section simply supported beam is provided,
Including normal concrete layer 2, ECC layer 1 and framework of steel reinforcement, wherein framework of steel reinforcement is set to inside normal concrete layer 2, and ECC layers
1 is set to 2 outside of normal concrete layer.
Framework of steel reinforcement includes longitudinal stress muscle 4, longitudinal bearing rod 5, stirrup 3 and abdomen muscle 6, longitudinal stress muscle 4 and longitudinal frame
It is connected between stud 5 by several spaced stirrups 3.
As shown in figure 3, longitudinal stress muscle 4 is located at the inside of normal concrete layer 2 close to bottom position, longitudinal bearing rod 5
In the inside of normal concrete layer 2 close to top position, the longitudinal stress muscle 4 be parallel to each other with longitudinal bearing rod 5 and respectively with
Stirrup 3 is vertical.
Longitudinal stress muscle 4, longitudinal bearing rod 5 are sheathed on 3 inside of stirrup and bind together with stirrup 3 respectively.
Abdomen muscle 6 is set between 2 bottom longitudinal stress muscle 4 of normal concrete layer and longitudinal bearing rod 5 and is located at and binds round into interior
Side is simultaneously bound together therewith.
ECC is a kind of superhigh tenacity cement-base composite material, by cement, quartz sand, flyash, water, high efficiency water reducing agent, increasing
Thick dose and PVA fiber composition, the volume aspect ratio of PVA fiber is 2% or so.
PVA fiber has good dispersibility in cement matrix and is substantially better than steel with the bonding degree of cement matrix
Muscle, while also with the characteristics of high intensity, high tenacity, fine corrosion resistance, chemical stability is good and multiple cracking cracks.It is fine
The common stress of peacekeeping cement matrix simultaneously can undertake significant component of stress, so that ECC material is whole compared to normal concrete
Body performance is outstanding.
When ECC stress deformation, since fiber is in three-dimensional random distribution in the base, the plasticity of concrete is improved
Can, and play the role of " bridging " when crack occurs, deformation is effectively constrained, fiber itself is formed across crack stress
A large amount of microcracks crack and show apparent strain hardening feature, to compensate for lacking for inside concrete to a certain extent
It falls into.
The greatest limit stretching strain of ECC can achieve 6%, compared to normal concrete, greatly improve simply supported beam
Deformability；ECC material fracture width is between 40 μm -60 μm.There is ECC material superior ductility and microcrack to control energy
Power, this material are applied to the tensile region of works, and the fracture width that not only can control structure can also give full play to material
Excellent performance, improve the bearing capacity, ductility and endurance quality of structure.
ECC layer 1 is common with the replacement of ECC material in the range of each one times or so the protective layer thickness in tensile region reinforcing bar two sides
Concrete material, ECC material are lighter compared to common concrete material quality, can effectively subtract for compound cross-section simply supported beam
The self weight of light component；And ECC material has the curved energy for drawing deformation of better extension characteristics, resistance compared to common concrete material
The control ability of power and microcrack not only increases the curved drawing performance of structure, while being also difficult to control normal concrete
The brittle failure mode of single major fracture cracking is converted into the ductile failure mode of a large amount of microcrack crackings.
The application compound cross-section simply supported beam is poured pouring in die trial 8.
Between ECC layer 1 and normal concrete layer 2 by both cohesive force between side interface, mechanical snap power with
And frictional resistance is combined into the simply supported beam of a rectangular section, increases the overall stability and bearing capacity of composite structure.
Unsticking layer is laid in bottom interface between normal concrete layer 2 and ECC layer 1.
In some embodiments, the unsticking layer is polytetrafluoroethylene film 7, is made by polytetrafluoroethylene film 7 general
Unsticking between logical concrete layer 2 and ECC layer 1, has efficiently controlled the cracking width and height in crack, so that ECC layer 1 is cracking
When, crack will not be extended up to normal concrete layer 2, effectively inhibited the inside configuration because caused by there is crack and corroded
And the appearance of reinforcement corrosion phenomenon, the endurance quality of structure, overall performance and service life are improved, it is feeding to reduce the later period
Protect maintenance cost.
In the present embodiment, the production method of compound cross-section simply supported beam the following steps are included:
Longitudinal stress muscle 4, longitudinal bearing rod 5, abdomen muscle 6 are formed framework of steel reinforcement with the binding of stirrup 3 respectively by step (1), and
In the fixing mould at 5 millimeters of outside reinforcing bar, normal concrete, maintenance to 14 day age are poured；
Step (2) is laid with polytetrafluoroethylene film 7 in 2 top surface of normal concrete layer；
Step (3) places template at the protective layer thickness of one times of 2 side of normal concrete layer, and (the specific thickness of protective layer is by institute
Place's environment and actual design requirement are determined), and pour ECC layer 1；
Step (4) carries out standard curing processing to compound cross-section simply supported beam.
The application compound cross-section simply supported beam can be improved the normal use performance and endurance quality of structure, and has and apply
Work is convenient, economical and practical feature, can be applied to building, bridge, the beam in railway structure.
The foregoing is merely preferred embodiment of the present application, are not intended to limit this application, for the skill of this field
For art personnel, various changes and changes are possible in this application.Within the spirit and principles of this application, made any to repair
Change, equivalent replacement, improvement etc., should be included within the scope of protection of this application.
Claims (10)
1. a kind of compound cross-section simply supported beam, which is characterized in that the ECC layer including normal concrete layer and on the outside of it, ECC layers
The simply supported beam of a rectangular section, ECC layers and normal concrete are combined by side interface between normal concrete layer
Bottom interface between layer is laid with unsticking layer；
The normal concrete layer is internally provided with for the framework of steel reinforcement as support.
2. a kind of compound cross-section simply supported beam according to claim 1, which is characterized in that the unsticking layer is polytetrafluoroethylene (PTFE)
Film.
3. a kind of compound cross-section simply supported beam according to claim 1, which is characterized in that the framework of steel reinforcement include it is longitudinal by
Power muscle and longitudinal bearing rod are connected between longitudinal stress muscle and longitudinal bearing rod by several spaced stirrups.
4. a kind of compound cross-section simply supported beam according to claim 3, which is characterized in that the longitudinal bearing rod is set to longitudinal
Above principal rod, longitudinal stress muscle and longitudinal bearing rod are bound together with stirrup respectively.
5. a kind of compound cross-section simply supported beam according to claim 3, which is characterized in that the framework of steel reinforcement two sides it is longitudinal by
Abdomen muscle is disposed between power muscle and longitudinal bearing rod.
6. a kind of compound cross-section simply supported beam according to claim 5, which is characterized in that the abdomen muscle and stirrup are bound one
It rises.
7. a kind of compound cross-section simply supported beam according to claim 3, which is characterized in that the longitudinal stress muscle and longitudinal frame
Stud is parallel to each other and vertical with stirrup respectively.
8. a kind of compound cross-section simply supported beam according to claim 1, which is characterized in that ECC layers of the thickness is common
Within the scope of one times of protective layer thickness of concrete layer.
9. the production method of -8 any a kind of compound cross-section simply supported beams according to claim 1, which is characterized in that including with
Lower step:
Step (1) assembling reinforcement skeleton, and in the fixing mould at the reinforcing bar 5-10 millimeter of outside, normal concrete is poured, is supported
Protect setting time；
Step (2) is laid with polytetrafluoroethylene film in normal concrete layer surface；
Step (3) is placing template at normal concrete layer side setting thickness, and pours ECC layers；
Step (4) carries out standard curing processing to compound cross-section simply supported beam.
10. a kind of production method of compound cross-section simply supported beam according to claim 9, which is characterized in that the step (3)
In, template is placed at one times away from normal concrete side protective layer thickness.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910079922.9A CN109680871A (en) | 2019-01-28 | 2019-01-28 | A kind of compound cross-section simply supported beam and preparation method thereof |
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| CN201910079922.9A CN109680871A (en) | 2019-01-28 | 2019-01-28 | A kind of compound cross-section simply supported beam and preparation method thereof |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112252586A (en) * | 2020-10-29 | 2021-01-22 | 山东大学 | Prefabricated simply-supported beam with replaceable protective layer and manufacturing method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112252586A (en) * | 2020-10-29 | 2021-01-22 | 山东大学 | Prefabricated simply-supported beam with replaceable protective layer and manufacturing method thereof |
| CN112252586B (en) * | 2020-10-29 | 2021-09-21 | 山东大学 | Prefabricated simply-supported beam with replaceable protective layer and manufacturing method thereof |
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Application publication date: 20190426 |