CN111456321A - FRP (fiber reinforced plastic) concrete beam with compression area having high ductility - Google Patents
FRP (fiber reinforced plastic) concrete beam with compression area having high ductility Download PDFInfo
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- CN111456321A CN111456321A CN202010446519.8A CN202010446519A CN111456321A CN 111456321 A CN111456321 A CN 111456321A CN 202010446519 A CN202010446519 A CN 202010446519A CN 111456321 A CN111456321 A CN 111456321A
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- 239000004567 concrete Substances 0.000 title claims abstract description 105
- 230000006835 compression Effects 0.000 title claims abstract description 40
- 238000007906 compression Methods 0.000 title claims abstract description 40
- 229920002430 Fibre-reinforced plastic Polymers 0.000 title abstract description 42
- 239000011151 fibre-reinforced plastic Substances 0.000 title abstract description 42
- 239000011150 reinforced concrete Substances 0.000 claims abstract description 20
- 239000002131 composite material Substances 0.000 claims description 29
- 239000004568 cement Substances 0.000 claims description 10
- 239000000835 fiber Substances 0.000 claims description 7
- 239000000853 adhesive Substances 0.000 claims description 4
- 230000001070 adhesive effect Effects 0.000 claims description 4
- 239000011374 ultra-high-performance concrete Substances 0.000 claims description 4
- 239000004576 sand Substances 0.000 claims description 3
- 239000004575 stone Substances 0.000 claims description 3
- 238000010422 painting Methods 0.000 claims 1
- 238000000034 method Methods 0.000 abstract description 6
- 239000004033 plastic Substances 0.000 abstract 1
- 229920003023 plastic Polymers 0.000 abstract 1
- 230000007797 corrosion Effects 0.000 description 4
- 238000005260 corrosion Methods 0.000 description 4
- 239000000463 material Substances 0.000 description 4
- 229910000831 Steel Inorganic materials 0.000 description 3
- 230000001680 brushing effect Effects 0.000 description 3
- 230000002787 reinforcement Effects 0.000 description 3
- 239000010959 steel Substances 0.000 description 3
- 102100040287 GTP cyclohydrolase 1 feedback regulatory protein Human genes 0.000 description 2
- 101710185324 GTP cyclohydrolase 1 feedback regulatory protein Proteins 0.000 description 2
- 239000011230 binding agent Substances 0.000 description 2
- 238000005336 cracking Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 239000002023 wood Substances 0.000 description 2
- 229910001294 Reinforcing steel Inorganic materials 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000003763 carbonization Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000009415 formwork Methods 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000005498 polishing Methods 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 230000002028 premature Effects 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
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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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- Engineering & Computer Science (AREA)
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Abstract
The invention discloses an FRP (fiber reinforced plastic) reinforced concrete beam with a high ductility performance in a compression zone, which belongs to the technical field of structures and comprises a beam body, wherein an FRP rib framework is arranged in the beam body, high-ductility concrete is poured in the compression zone at the top of the beam body, a tension zone at the bottom of the beam body adopts common concrete or high-ductility concrete, and the thickness of the high-ductility concrete in the compression zone at the top of the beam body is not less than 20mm and not more than half of the thickness of the beam body; according to the invention, the high-ductility concrete layer is superposed on the top compression area of the traditional FRP reinforced concrete beam, so that the mechanical property of the FRP reinforced concrete beam can be effectively exerted, the beam is not damaged suddenly and is damaged in a ductile and symptomatic damage process, the ductility of the FRP reinforced concrete beam is improved, the durability of the combined beam can be fully improved, the crack width of the beam in the stress process can be effectively controlled, the early plastic crack of the concrete is effectively inhibited, and the toughness of the concrete can be improved.
Description
Technical Field
The invention belongs to the technical field of structures, and particularly relates to an FRP (fiber reinforced plastic) bar concrete beam with a high ductility in a compression zone.
Background
The existing building structure mostly uses traditional FRP (fiber reinforced plastic) concrete as a main structure, however, the concrete has a series of defects of poor tensile property, low reliability, difficulty in controlling cracks after cracking and the like, so that various crack problems are easy to occur in the use process of the concrete structure, and the durability of the structure is greatly reduced.
The Fiber Reinforced Polymer (FRP) has the advantages of high strength, light weight, corrosion resistance and the like, can replace steel bars in actual engineering, solves the engineering problems of corrosion of the steel bars and the like, and is widely applied to FRP bar Reinforced concrete structures. However, the stress-strain relationship between the low elastic modulus of the FRP bars and the linear elasticity causes the FRP reinforced concrete composite beam to generate large cracks and deflection, and the FRP bars are damaged in a brittle way, so that the use of the FRP bars in concrete beams is limited.
High ductility cement-based Composite (ECC) is a Composite with high toughness, high ductility and multi-crack cracking characteristics. The concrete has the capability of bending like metal, has higher toughness and better fatigue resistance compared with the traditional concrete, has the characteristic of self-repairing, is about 20-40% lighter than the common concrete, can be used as a structure to replace or partially replace the concrete, is an effective measure for controlling the structural crack, and has extremely important significance in the aspects of improving the structural safety and durability.
Ultra-High Performance Concrete (UHPC) is also called Reactive Powder Concrete (RPC), which is the most innovative cement-based engineering material in the last three decades, and realizes a large span of engineering material Performance.
At present, the ECC-concrete composite beam is mainly formed by pouring cement-based composite material ECC for engineering in a tension area of a beam body, and common concrete is still adopted in a compression area, for example, Chinese patent CN107327078A discloses a novel steel-continuous fiber composite bar ECC-concrete composite beam and a preparation method thereof, the ECC-concrete composite beam is formed by combining two cement-based materials in layers, and the ECC-concrete composite beam has the structural key points that: the cement-based composite material ECC is used for replacing part of concrete in a tension area in a process, and the concrete in a compression area still adopts common concrete, but the problem that a beam body, particularly the top of the beam body, is not damaged in a brittle manner without any sign can not be solved.
Disclosure of Invention
The invention provides an FRP rib concrete beam with high ductility performance in a compression area aiming at the problems of large crack width, brittle failure, poor ductility and influence on the bearing capacity and ductility of a beam member due to premature crushing in the use of an FRP rib concrete structure, and the technical scheme adopted for achieving the purpose is as follows:
the FRP reinforced concrete beam with the compression area having high ductility comprises a beam body, wherein an FRP rib framework is arranged in the beam body, high-ductility concrete is poured in the compression area at the top of the beam body, the tension area at the bottom of the beam body adopts common concrete or high-ductility concrete, and the thickness of the high-ductility concrete in the compression area at the top of the beam body is not less than 20mm and not more than half of the thickness of the beam body.
Preferably, the high-ductility concrete is overlapped on the whole area of the top compression area of the beam body, or the high-ductility concrete is overlapped on a certain section or a certain section area of the top compression area of the beam body.
Preferably, the elongation of the high-ductility concrete is more than 1%, so that the average ductility of the compression zone is improved to the specified requirement.
Preferably, strip-shaped concave-convex grooves matched with each other are arranged between the top of the beam body and the corresponding high-ductility concrete contact surface, and the concave-convex grooves are subjected to polishing treatment, coarse sand sticking, stone sticking or interface adhesive brushing so as to increase the interface bonding degree.
Preferably, the top of the FRP rib frame extends into the high-ductility concrete.
Preferably, the high-ductility concrete is high-ductility fiber concrete, ultrahigh-performance concrete, fiber concrete, elastic concrete or an ultrahigh-toughness cement-based composite material.
Preferably, the FRP reinforced concrete beam can be an FRP rib concrete beam, an ECC-FRP reinforced concrete composite beam, a high-ductility material-FRP reinforced concrete composite beam and an UHPC-FRP reinforced concrete composite beam.
Preferably, concrete with the required height is poured along the tensile area of the bottom of the beam, the FRP rib framework which is bound in advance is placed into the concrete, the concrete is continuously poured to reach the set height, the interface binder is coated after the concrete reaches the required strength, the high-ductility concrete is continuously poured, and the high-ductility concrete is jointly cured.
The invention has the following beneficial effects:
(1) compared with the traditional FRP reinforced concrete beam, the high-ductility concrete layer superposed in a certain section or the whole range of the top compression area can assist the compression of the member, delay the compression damage, fully exert the mechanical property and improve the ductility of the FRP reinforced concrete beam;
(2) the FRP bar high-ductility concrete composite beam provided by the invention can fully play the roles of FRP bar corrosion resistance and high-ductility concrete reinforcement and toughening, can effectively control cracks of the beam in a stress process, reduces the risks of concrete carbonization and reinforcing steel bar corrosion, and has important significance for improving the durability of the concrete beam.
(3) The concrete layer with high ductility is arranged in the compression area, and compared with an FRP rib common concrete beam and an FRP rib combined beam with ECC in the tension area, the ductility is greatly improved. According to the specification of concrete specification on ductility coefficient, the ductility coefficient expression of section curvature can be obtained by correcting:
wherein
The ductility of the composite beam is improved by nearly five times, the phenomenon that the tensile rib fails due to the fact that the beam top concrete is crushed after yielding can be avoided, and the method has important significance for engineering use.
Drawings
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is a cross-sectional view taken along line A-A of FIG. 1;
FIG. 3 is a schematic structural diagram provided in the first embodiment;
fig. 4 is a schematic structural diagram provided in scheme two.
Detailed Description
The invention is further described below with reference to the accompanying drawings.
As shown in fig. 1 and 2, the FRP reinforced concrete beam with high ductility at compression zone comprises a beam body (2), high ductility concrete (1) is poured at the top compression zone of the beam body (2), an FRP reinforcement framework (3) is arranged in the beam body (2), and the tension zone at the bottom of the beam body (2) is made of common concrete or high ductility concrete, and has a thickness not less than 20mm and not more than half of the thickness of the beam body (2).
According to the actual design requirement, the high-ductility concrete (1) can be superposed on the whole area, a certain section of area or a plurality of sections of areas of the top compression area of the beam body (2).
The compression zone is provided with a high-ductility material with the elongation rate of more than 1%, so that the average ductility of the compression zone is generally improved.
Strip-shaped concave-convex grooves which are matched with each other, grinding treatment, coarse sand sticking, stone sticking or interface adhesive brushing are arranged between the top of the beam body (2) and the contact surface of the corresponding high-ductility concrete (1) to increase the interface combination degree.
The high-ductility concrete (1) is high-ductility fiber concrete, ultrahigh-performance concrete, fiber concrete, elastic concrete or a cement-based composite material; the top of the FRP rib framework (3) extends into the high-ductility concrete (1).
The FRP reinforced concrete beam can be an FRP rib concrete beam, an ECC-FRP reinforced concrete composite beam, a high-ductility material-FRP reinforced concrete composite beam, an UHPC-FRP reinforced concrete composite beam and the like.
According to the invention, two solutions are provided:
the first scheme is as follows:
according to the scheme, an engineering cement-based composite material (ECC) is selected to be overlapped in a compression area at the top of the beam, the thickness is selected to be 30mm, and the pouring is carried out along the whole longitudinal range of the beam; the FRP rib framework selects steel bars and GFRP rib framework mixed reinforcement; at two kinds of concrete coincide department, set up strip recess and increase area of contact, improve the adhesion property between the two, make the congruent structure have better wholeness. The scheme can better increase the ductility of the composite beam.
When concrete is poured to a certain height, a plurality of wood battens are selected to be supported between the formworks on the two sides, the concrete is continuously poured, the vibration is dense, and a plurality of grooves are formed in the surface of the concrete; after the concrete reaches a certain strength, drawing out the wood fillets and continuously pouring ECC; and after pouring is finished, jointly maintaining.
Scheme II:
according to the scheme, an engineering cement-based composite material (ECC) is selected to be overlapped on a compression area at the top of the beam and a tension area at the bottom of the beam, the thicknesses are respectively selected to be 40mm and 30mm, and the beam is poured in the whole longitudinal range; the FRP rib framework adopts a GFRP rib framework; and brushing an interface binder at the position where the two types of concrete are overlapped. The scheme can not only improve the bearing capacity and the ductility of the composite beam, but also fully improve the durability of the composite beam.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: it is to be understood that modifications may be made to the technical solutions described in the foregoing embodiments, or equivalents may be substituted for some of the technical features thereof, but such modifications or substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present invention.
Claims (8)
1. The FRP reinforced concrete beam with the compression area having high ductility comprises a beam body and is characterized in that an FRP rib framework is arranged in the beam body, high-ductility concrete is poured in the compression area at the top of the beam body, the tension area at the bottom of the beam body adopts common concrete or high-ductility concrete, and the thickness of the high-ductility concrete in the compression area at the top of the beam body is not less than 20mm and not more than half of the thickness of the beam body.
2. The FRP rib concrete beam with a compression zone having high ductility according to claim 1, wherein the high ductility concrete is laminated on the whole area of the compression zone at the top of the beam body, or the high ductility concrete is laminated on a section or sections of the compression zone at the top of the beam body.
3. The FRP rib concrete beam with a compression zone having high ductility according to claim 1, wherein the elongation of the high ductility concrete is more than 1%, so that the average ductility of the compression zone is improved to the specified requirement.
4. The FRP reinforced concrete beam with high ductility of the compression zone as claimed in any one of claims 1 to 3, wherein a strip-shaped concave-convex groove, a grinding treatment, a coarse sand sticking, a stone sticking or an interface adhesive painting are arranged between the top of the beam body and the corresponding contact surface of the high ductility concrete to match with each other so as to increase the interface bonding degree.
5. The FRP rib concrete beam with high ductility of the compression zone as claimed in claim 4, wherein the top of the FRP rib frame extends into the high ductility concrete.
6. The FRP rib concrete beam with high ductility performance in the compression zone as claimed in any one of claims 1 to 5, wherein the high ductility concrete is high ductility fiber concrete, ultra high performance concrete, fiber concrete, elastic concrete or ultra high toughness cement-based composite material.
7. The FRP rib concrete beam with high ductility performance in the compression zone as claimed in claim 6, wherein the FRP rib concrete beam can be an FRP rib concrete beam, an ECC-FRP rib concrete composite beam, a high ductility material-FRP rib concrete composite beam and a UHPC-FRP rib concrete composite beam.
8. The FRP rib concrete beam with the high ductility at the compression area as claimed in claim 7, wherein the concrete with the required height is poured along the tension area at the bottom of the beam, the FRP rib frame which is bound in advance is put into the concrete, the concrete is continuously poured to reach the set height, after the concrete reaches the required strength, the interface adhesive is brushed, the high ductility concrete is continuously poured, and the high ductility concrete beam is jointly cured.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010446519.8A CN111456321A (en) | 2020-05-25 | 2020-05-25 | FRP (fiber reinforced plastic) concrete beam with compression area having high ductility |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010446519.8A CN111456321A (en) | 2020-05-25 | 2020-05-25 | FRP (fiber reinforced plastic) concrete beam with compression area having high ductility |
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| CN111456321A true CN111456321A (en) | 2020-07-28 |
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| CN202010446519.8A Pending CN111456321A (en) | 2020-05-25 | 2020-05-25 | FRP (fiber reinforced plastic) concrete beam with compression area having high ductility |
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Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20060201099A1 (en) * | 2005-03-08 | 2006-09-14 | City University Of Hong Kong | Structural members with improved ductility |
| CN104251035A (en) * | 2014-09-26 | 2014-12-31 | 郑州大学 | FRP (Fiber Reinforced Plastic) bar and fiber high-strength concrete beam component |
| CN205063178U (en) * | 2015-09-11 | 2016-03-02 | 淮阴师范学院 | Engineered cementitious composites combination beam component |
| CN105464288A (en) * | 2016-01-18 | 2016-04-06 | 东南大学 | Composite bar-reinforced ECC and concrete composite beam and construction method thereof |
| CN107217788A (en) * | 2017-04-28 | 2017-09-29 | 郑州大学 | Full FRP muscle enhancing ECC Combined concrete beams and preparation method thereof |
| CN107327078A (en) * | 2017-06-28 | 2017-11-07 | 扬州大学 | A kind of Novel steel continuous fiber composite reinforcing ECC concrete composite beams and preparation method thereof |
| CN108824696A (en) * | 2018-06-14 | 2018-11-16 | 同济大学 | A kind of FRP tendons seawater sea sand-UHDCC composite beam and its construction method |
| CN110847496A (en) * | 2019-12-02 | 2020-02-28 | 湖北工业大学 | FRP rib part steel fiber reinforced concrete beam and preparation method thereof |
| CN111042437A (en) * | 2019-12-31 | 2020-04-21 | 同济大学 | Semi-prefabricated FRP (fiber reinforced plastic) reinforced concrete ductile simply-supported beam and preparation method thereof |
| CN212613375U (en) * | 2020-05-25 | 2021-02-26 | 郑州大学 | FRP (fiber reinforced plastic) concrete beam with compression area having high ductility |
-
2020
- 2020-05-25 CN CN202010446519.8A patent/CN111456321A/en active Pending
Patent Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20060201099A1 (en) * | 2005-03-08 | 2006-09-14 | City University Of Hong Kong | Structural members with improved ductility |
| CN104251035A (en) * | 2014-09-26 | 2014-12-31 | 郑州大学 | FRP (Fiber Reinforced Plastic) bar and fiber high-strength concrete beam component |
| CN205063178U (en) * | 2015-09-11 | 2016-03-02 | 淮阴师范学院 | Engineered cementitious composites combination beam component |
| CN105464288A (en) * | 2016-01-18 | 2016-04-06 | 东南大学 | Composite bar-reinforced ECC and concrete composite beam and construction method thereof |
| CN107217788A (en) * | 2017-04-28 | 2017-09-29 | 郑州大学 | Full FRP muscle enhancing ECC Combined concrete beams and preparation method thereof |
| CN107327078A (en) * | 2017-06-28 | 2017-11-07 | 扬州大学 | A kind of Novel steel continuous fiber composite reinforcing ECC concrete composite beams and preparation method thereof |
| CN108824696A (en) * | 2018-06-14 | 2018-11-16 | 同济大学 | A kind of FRP tendons seawater sea sand-UHDCC composite beam and its construction method |
| CN110847496A (en) * | 2019-12-02 | 2020-02-28 | 湖北工业大学 | FRP rib part steel fiber reinforced concrete beam and preparation method thereof |
| CN111042437A (en) * | 2019-12-31 | 2020-04-21 | 同济大学 | Semi-prefabricated FRP (fiber reinforced plastic) reinforced concrete ductile simply-supported beam and preparation method thereof |
| CN212613375U (en) * | 2020-05-25 | 2021-02-26 | 郑州大学 | FRP (fiber reinforced plastic) concrete beam with compression area having high ductility |
Non-Patent Citations (1)
| Title |
|---|
| 葛文杰;冯肖;季翔;陈坦;: "纤维增强复材筋增强工程用水泥基复合材料-混凝土复合梁受弯性能试验研究", 工业建筑, no. 11, 20 November 2017 (2017-11-20) * |
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