CN115467470B - Method for improving tensile property of round CFRP-steel tube concrete - Google Patents
Method for improving tensile property of round CFRP-steel tube concrete Download PDFInfo
- Publication number
- CN115467470B CN115467470B CN202211195145.2A CN202211195145A CN115467470B CN 115467470 B CN115467470 B CN 115467470B CN 202211195145 A CN202211195145 A CN 202211195145A CN 115467470 B CN115467470 B CN 115467470B
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- CN
- China
- Prior art keywords
- steel
- cfrp
- steel pipe
- end plate
- cfrp cloth
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Links
- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 111
- 239000010959 steel Substances 0.000 title claims abstract description 111
- 238000000034 method Methods 0.000 title claims abstract description 18
- 239000004918 carbon fiber reinforced polymer Substances 0.000 claims abstract description 49
- 239000004744 fabric Substances 0.000 claims abstract description 43
- 239000000853 adhesive Substances 0.000 claims abstract description 9
- 230000001070 adhesive effect Effects 0.000 claims abstract description 9
- 238000012423 maintenance Methods 0.000 claims description 2
- 238000004873 anchoring Methods 0.000 abstract description 3
- 239000002131 composite material Substances 0.000 description 3
- 238000005452 bending Methods 0.000 description 2
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 230000001808 coupling effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000010030 laminating Methods 0.000 description 1
- 238000003475 lamination Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 239000013535 sea water Substances 0.000 description 1
- 230000007480 spreading Effects 0.000 description 1
- 238000003892 spreading Methods 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
- 238000004804 winding Methods 0.000 description 1
Classifications
-
- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04C—STRUCTURAL ELEMENTS; BUILDING MATERIALS
- E04C3/00—Structural elongated elements designed for load-supporting
- E04C3/30—Columns; Pillars; Struts
- E04C3/36—Columns; Pillars; Struts of materials not covered by groups E04C3/32 or E04C3/34; of a combination of two or more materials
-
- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04C—STRUCTURAL ELEMENTS; BUILDING MATERIALS
- E04C5/00—Reinforcing elements, e.g. for concrete; Auxiliary elements therefor
- E04C5/01—Reinforcing elements of metal, e.g. with non-structural coatings
-
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Architecture (AREA)
- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Mechanical Engineering (AREA)
- Rod-Shaped Construction Members (AREA)
- Joining Of Building Structures In Genera (AREA)
Abstract
The invention relates to the technical field of constructional engineering, in particular to a method for improving the tensile property of round CFRP-steel tube concrete. The upper end plate and the lower end plate are used for anchoring, the upper side and the lower side of the CFRP cloth are repeatedly folded to form a multi-layer structure, building structural adhesive between the CFRP cloth and a steel pipe is invalid under a larger tensile load, the CFRP cloth and the steel pipe are easy to peel, the upper side and the lower side of the CFRP cloth of the multi-layer structure are clamped and fixed through the steel clamp and the connecting steel column, the CFRP cloth is extruded and fixed more fully through the corrugated structure, the operation of the method is simpler, the stress concentration on steel pipe concrete is avoided due to the fact that the steel clamp is fixed on the outer side of the connecting steel column, the tensile property of the CFRP cloth is better exerted, and the tensile property of the CFRP-steel pipe concrete is improved.
Description
Technical Field
The invention relates to the technical field of constructional engineering, in particular to a method for improving the tensile property of round CFRP-steel tube concrete.
Background
Carbon fiber reinforced polymer (Carbon Fiber Reinforced Polymer/plastics, CFRP for short) is a new composite material with tensile strength up to several gigapascals, which is often used to reinforce damaged structures. CFRP-steel pipe concrete is a novel combined structure formed by filling concrete in a steel pipe and externally winding CFRP sheets. The concrete can be respectively round, square, polygonal, hollow sandwich steel pipe concrete and the like according to the section form.
Steel pipe concrete tension members are common, for example, in some high-rise and super-high-rise buildings, steel pipe concrete is used as structural side columns, foundation piles bear lateral or impact loads, wind loads, earthquake loads and other reasons, and the steel pipe concrete members can be in a tension state; in a steel pipe concrete column factory building, stretching limbs of a double-limb column bear stretch bending load under crane load; the steel pipe concrete chord in the bridge structure mainly bears tensile load, and under the conditions of structural overload, earthquake load and other accidental loads, the chord can be in a stretch bending coupling action state.
The method comprises the steps that (1) a marine aggregate seawater concrete combined column of a corrosion-resistant CFRP-high-strength steel composite pipe with the existing application number of CN202110719184.7 is formed by spreading CFRP cloth on the outer wall and uniformly coating structural adhesive on the CFRP cloth, and the structural adhesive is uniformly coated on the outer wall of a high-strength steel pipe; firstly, horizontally placing and fixing a high-strength steel pipe, then aligning and laminating one end of the CFRP cloth on the outer wall with the high-strength steel pipe, trowelling bubbles, pressing the end head of the CFRP cloth on the outer wall, rotating the high-strength steel pipe to enable the rest CFRP cloth on the outer wall of the high-strength steel pipe to be laminated, and continuing the lamination process until the CFRP cloth on the outer wall is completely laminated on the high-strength steel pipe, thus obtaining the composite pipe. The CFRP cloth and the steel tube can be bonded by using building structural adhesive, but under a larger tensile load, the CFRP cloth and the steel tube are easy to peel off, and the tensile performance of the CFRP cloth cannot be fully exerted.
Disclosure of Invention
The present invention is directed to solving the above problems, and thus to provide a method for improving tensile properties of round CFRP-steel tube concrete, which can fully exert tensile properties of CFRP.
The invention solves the problems, and adopts the following technical scheme:
a method for improving tensile property of round CFRP-steel tube concrete comprises the following steps:
step one: the method comprises the steps of pre-preparing an upper end plate, a lower end plate, a steel clamp, steel pipes and CFRP cloth, wherein connecting steel columns with the same radius as the steel pipes are welded on one sides of the upper end plate and the lower end plate, the outer surfaces of the connecting steel columns are of corrugated structures, the steel clamp consists of two opposite semicircular hoops, two ends of each semicircular hoop are respectively provided with an ear plate, the corresponding ear plates are fastened through bolts, and the inner surfaces of the steel clamps are of corrugated structures matched with the outer surfaces of the connecting steel columns;
step two: one end of the steel pipe is opposite to the connecting steel column of the lower end plate and welded, and concrete is poured into the steel pipe;
step three: after maintenance, the other end of the steel pipe is opposite to the connecting steel column of the upper end plate and welded;
step four: the CFRP cloth is longitudinally wrapped on the steel pipe, the CFRP cloth and the steel pipe are bonded by using building structural adhesive, and the upper side and the lower side of the CFRP cloth are repeatedly folded at the outer sides of the connecting steel columns to form a multi-layer structure;
step five: the steel clamps are fixed on the periphery of the connecting steel column, and the upper side and the lower side of the CFRP cloth are fixed between the steel clamps and the connecting steel column.
Compared with the prior art, the invention adopting the technical scheme has the outstanding characteristics that:
the upper end plate and the lower end plate are used for anchoring, the upper side and the lower side of the CFRP cloth are repeatedly folded to form a multi-layer structure, building structural adhesive between the CFRP cloth and a steel pipe is invalid under a larger tensile load, the CFRP cloth and the steel pipe are easy to peel, the upper side and the lower side of the CFRP cloth of the multi-layer structure are clamped and fixed through the steel clamp and the connecting steel column, the CFRP cloth is extruded and fixed more fully through the corrugated structure, the operation of the method is simpler, the stress concentration on steel pipe concrete is avoided due to the fact that the steel clamp is fixed on the outer side of the connecting steel column, the tensile property of the CFRP cloth is better exerted, and the tensile property of the CFRP-steel pipe concrete is improved.
Drawings
FIG. 1 is a schematic diagram of a front view cross-section structure of a round CFRP-steel tube concrete manufactured by a method for improving the tensile property of the round CFRP-steel tube concrete according to an embodiment of the invention;
FIG. 2 is a schematic top view of a steel clamp used in a method for improving the tensile properties of round CFRP-steel tube concrete according to an embodiment of the present invention;
marked in the figure as: an upper end plate 1, a lower end plate 2, a steel clamp 3, steel pipes 4, CFRP cloth 5, connecting steel columns 6 and concrete 7.
Detailed Description
The invention is further described below in connection with the following examples which are provided for the purpose of better understanding of the present invention and are, therefore, not to be construed as limiting the scope of the invention.
A method for improving tensile property of round CFRP-steel tube concrete comprises the following steps:
the first step: the steel clamp 3 consists of two opposite semicircular hoops, two ends of each semicircular hoop are respectively provided with an ear plate, the corresponding ear plates are fastened through bolts, and the inner surfaces of the steel clamps 3 are of corrugated structures matched with the outer surfaces of the connecting steel columns 6.
Step two: and (3) welding one end of the steel pipe 4 opposite to the connecting steel column 6 of the lower end plate 2, and pouring concrete 7 into the steel pipe 4.
Step three: after curing, the other end of the steel pipe 4 is welded opposite to the connecting steel column 6 of the upper end plate 1.
Step four: the CFRP cloth 5 is longitudinally wrapped on the steel pipe 4, the CFRP cloth 5 and the steel pipe 4 are bonded by using building structural adhesive, and the upper side and the lower side of the CFRP cloth 5 are repeatedly folded at the outer sides of the connecting steel columns 6 to form a multi-layer structure.
Step five: the steel clamp 3 is fixed on the periphery of the connecting steel column 6, the upper side and the lower side of the CFRP cloth 5 are fixed between the steel clamp 3 and the connecting steel column 6, and the upper side and the lower side of the CFRP cloth 5 are more stable and prevent slipping through the corrugated structure.
The upper end plate 1 and the lower end plate 2 are used for anchoring, the upper side and the lower side of the CFRP cloth 5 are repeatedly folded to form a multi-layer structure, building structural adhesive between the CFRP cloth 5 and a steel pipe is invalid under a larger tensile load, the CFRP cloth and the steel pipe are easy to peel, the upper side and the lower side of the CFRP cloth 5 of the multi-layer structure are clamped and fixed through the steel clamp 3 and the connecting steel column 6, the CFRP cloth 5 is extruded and fixed more fully through the corrugated structure, the operation of the method is simpler, the stress concentration on steel pipe concrete is avoided due to the fact that the steel clamp 3 is fixed on the outer side of the connecting steel column 6, the tensile property of the CFRP cloth 5 is better exerted, and the tensile property of the CFRP-steel pipe concrete is improved.
The foregoing description of the preferred embodiments of the invention is not intended to limit the scope of the claims, but rather to cover all equivalent modifications within the scope of the present invention as defined by the appended claims.
Claims (1)
1. A method for improving the tensile property of round CFRP-steel tube concrete is characterized by comprising the following steps: the method comprises the following steps:
step one: the method comprises the steps of pre-preparing an upper end plate, a lower end plate, a steel clamp, steel pipes and CFRP cloth, wherein connecting steel columns with the same radius as the steel pipes are welded on one sides of the upper end plate and the lower end plate, the outer surfaces of the connecting steel columns are of corrugated structures, the steel clamp consists of two opposite semicircular hoops, two ends of each semicircular hoop are respectively provided with an ear plate, the corresponding ear plates are fastened through bolts, and the inner surfaces of the steel clamps are of corrugated structures matched with the outer surfaces of the connecting steel columns;
step two: one end of the steel pipe is opposite to the connecting steel column of the lower end plate and welded, and concrete is poured into the steel pipe;
step three: after maintenance, the other end of the steel pipe is opposite to the connecting steel column of the upper end plate and welded;
step four: the CFRP cloth is longitudinally wrapped on the steel pipe, the CFRP cloth and the steel pipe are bonded by using building structural adhesive, and the upper side and the lower side of the CFRP cloth are repeatedly folded at the outer sides of the connecting steel columns to form a multi-layer structure;
step five: the steel clamps are fixed on the periphery of the connecting steel column, and the upper side and the lower side of the CFRP cloth are fixed between the steel clamps and the connecting steel column.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211195145.2A CN115467470B (en) | 2022-09-29 | 2022-09-29 | Method for improving tensile property of round CFRP-steel tube concrete |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211195145.2A CN115467470B (en) | 2022-09-29 | 2022-09-29 | Method for improving tensile property of round CFRP-steel tube concrete |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN115467470A CN115467470A (en) | 2022-12-13 |
| CN115467470B true CN115467470B (en) | 2023-11-03 |
Family
ID=84335764
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202211195145.2A Active CN115467470B (en) | 2022-09-29 | 2022-09-29 | Method for improving tensile property of round CFRP-steel tube concrete |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN115467470B (en) |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1664266A (en) * | 2005-03-23 | 2005-09-07 | 卓静 | Pretensioning construction method for temporary back corrugated tooth fixture anchor |
| CN101985851A (en) * | 2010-11-20 | 2011-03-16 | 大连理工大学 | FRP (fiber reinforced plastic)-steel composite tube concrete column |
| CN102261166A (en) * | 2011-05-25 | 2011-11-30 | 湖北金力工程复合材料有限公司 | Fiber reinforced polymer (FRP) sheet anchor device and anchoring method thereof |
| CN113374175A (en) * | 2021-06-28 | 2021-09-10 | 广西大学 | Corrosion-resistant CFRP-high-strength steel composite pipe sea aggregate seawater concrete combined column |
-
2022
- 2022-09-29 CN CN202211195145.2A patent/CN115467470B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1664266A (en) * | 2005-03-23 | 2005-09-07 | 卓静 | Pretensioning construction method for temporary back corrugated tooth fixture anchor |
| CN101985851A (en) * | 2010-11-20 | 2011-03-16 | 大连理工大学 | FRP (fiber reinforced plastic)-steel composite tube concrete column |
| CN102261166A (en) * | 2011-05-25 | 2011-11-30 | 湖北金力工程复合材料有限公司 | Fiber reinforced polymer (FRP) sheet anchor device and anchoring method thereof |
| CN113374175A (en) * | 2021-06-28 | 2021-09-10 | 广西大学 | Corrosion-resistant CFRP-high-strength steel composite pipe sea aggregate seawater concrete combined column |
Also Published As
| Publication number | Publication date |
|---|---|
| CN115467470A (en) | 2022-12-13 |
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