CN108868180A - A method of using the TRC thin plate lateral reinforcement RC beam for successively retreating lapping - Google Patents
A method of using the TRC thin plate lateral reinforcement RC beam for successively retreating lapping Download PDFInfo
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- CN108868180A CN108868180A CN201710328017.3A CN201710328017A CN108868180A CN 108868180 A CN108868180 A CN 108868180A CN 201710328017 A CN201710328017 A CN 201710328017A CN 108868180 A CN108868180 A CN 108868180A
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- Prior art keywords
- trc
- thin plate
- successively
- fabric web
- lapping
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Links
- 238000000034 method Methods 0.000 title claims abstract description 14
- 230000002787 reinforcement Effects 0.000 title abstract description 16
- 239000004744 fabric Substances 0.000 claims abstract description 25
- 238000005728 strengthening Methods 0.000 claims abstract description 7
- 238000000465 moulding Methods 0.000 claims abstract description 4
- 230000003014 reinforcing effect Effects 0.000 abstract description 13
- 239000000835 fiber Substances 0.000 abstract description 6
- 230000000694 effects Effects 0.000 abstract description 4
- 238000005452 bending Methods 0.000 abstract description 2
- 230000001066 destructive effect Effects 0.000 abstract 1
- 239000004567 concrete Substances 0.000 description 8
- 238000005516 engineering process Methods 0.000 description 7
- 230000008901 benefit Effects 0.000 description 6
- 239000011150 reinforced concrete Substances 0.000 description 6
- 239000010410 layer Substances 0.000 description 5
- 239000000463 material Substances 0.000 description 5
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 4
- 229920000049 Carbon (fiber) Polymers 0.000 description 4
- 229910052799 carbon Inorganic materials 0.000 description 4
- 238000011160 research Methods 0.000 description 4
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 3
- 239000004917 carbon fiber Substances 0.000 description 3
- 239000002131 composite material Substances 0.000 description 3
- 238000007596 consolidation process Methods 0.000 description 3
- 238000012360 testing method Methods 0.000 description 3
- 229920006231 aramid fiber Polymers 0.000 description 2
- 239000011083 cement mortar Substances 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 239000011521 glass Substances 0.000 description 2
- 239000003292 glue Substances 0.000 description 2
- GVALZJMUIHGIMD-UHFFFAOYSA-H magnesium phosphate Chemical compound [Mg+2].[Mg+2].[Mg+2].[O-]P([O-])([O-])=O.[O-]P([O-])([O-])=O GVALZJMUIHGIMD-UHFFFAOYSA-H 0.000 description 2
- 239000004137 magnesium phosphate Substances 0.000 description 2
- 229960002261 magnesium phosphate Drugs 0.000 description 2
- 229910000157 magnesium phosphate Inorganic materials 0.000 description 2
- 235000010994 magnesium phosphates Nutrition 0.000 description 2
- 239000011159 matrix material Substances 0.000 description 2
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 2
- 239000004570 mortar (masonry) Substances 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 239000007836 KH2PO4 Substances 0.000 description 1
- 229920000914 Metallic fiber Polymers 0.000 description 1
- 230000003712 anti-aging effect Effects 0.000 description 1
- 230000002457 bidirectional effect Effects 0.000 description 1
- 239000011230 binding agent Substances 0.000 description 1
- 229910021538 borax Inorganic materials 0.000 description 1
- 239000004568 cement Substances 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 229910052681 coesite Inorganic materials 0.000 description 1
- 238000013329 compounding Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 229910052906 cristobalite Inorganic materials 0.000 description 1
- 230000002708 enhancing effect Effects 0.000 description 1
- 239000003822 epoxy resin Substances 0.000 description 1
- 239000002657 fibrous material Substances 0.000 description 1
- 239000003365 glass fiber Substances 0.000 description 1
- 210000000569 greater omentum Anatomy 0.000 description 1
- 239000011229 interlayer Substances 0.000 description 1
- 238000002386 leaching Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 229910000402 monopotassium phosphate Inorganic materials 0.000 description 1
- 229920000647 polyepoxide Polymers 0.000 description 1
- GNSKLFRGEWLPPA-UHFFFAOYSA-M potassium dihydrogen phosphate Chemical compound [K+].OP(O)([O-])=O GNSKLFRGEWLPPA-UHFFFAOYSA-M 0.000 description 1
- 239000004576 sand Substances 0.000 description 1
- 239000000377 silicon dioxide Substances 0.000 description 1
- 239000004328 sodium tetraborate Substances 0.000 description 1
- 235000010339 sodium tetraborate Nutrition 0.000 description 1
- 229910052682 stishovite Inorganic materials 0.000 description 1
- 239000000758 substrate Substances 0.000 description 1
- 229910052905 tridymite Inorganic materials 0.000 description 1
- 238000009736 wetting Methods 0.000 description 1
Classifications
-
- 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
- E04G23/00—Working measures on existing buildings
- E04G23/02—Repairing, e.g. filling cracks; Restoring; Altering; Enlarging
- E04G23/0218—Increasing or restoring the load-bearing capacity of building construction elements
Abstract
The invention discloses a kind of using the TRC slab beam side method for strengthening for successively retreating lapping, it is characterized in that：It is laid with multilayer fabric net in the following bonding partially TRC thin plate of RC beam two sides natural axis, TRC thin plate used, the fabric web being laid with successively is retreated since beam bottom along deck-molding, and backstep is away between 2mm to 5mm.The reinforcement means improves beam anti-bending bearing capacity by making in TRC thin plate the longitudinal fiber bundle of fabric web and reinforcing bar bear pulling force jointly, simultaneously made in by curved destructive process by reinforcement the fibre bundle of fabric web in TRC thin plate since beam bottom gradually break to improve the ductility of beam, thus obtain ensure while effectively improving RC load bearing beam power reinforce the back rest have the effect of good ductile performance.
Description
Technical field
The invention belongs to reinforced concrete structure reinforcement and strengthening technical fields, are related to a kind of using the TRC thin plate side for successively retreating lapping
The method of face strengthening RC beam, this method ensures while effectively improving RC load bearing beam power reinforces the good ductility of the back rest
Energy.
Background technique
The research of Reinforcement Technology of Concrete Structure is all at home and abroad one of the emphasis of academic research, and concrete strengthening is
An important subdiscipline as Structural Engineering.The reality of experience and combination China from Foreign Architecture engineering development shows
Shape can affirm that its application prospect will be Social benefit and economic benefit that is very wide, and will obtaining high, to me
The modernization construction and development of state are of great immediate significance.
In recent years, fabric enhancing concrete (TRC) is at home and abroad at a new research hotspot.The country is to TRC
Research be concentrated mainly on TRC thin plate performance and using TRC thin plate in terms of the reinforcing of existing reinforced concrete structure.It is so-called that " TRC thin plate adds
Gu technology " is exactly by carbon fiber, glass fibre, aramid fiber or carbon/glass, carbon/aramid fiber assorted fibre stitch bonded fabrics net and high property
Energy fine concrete (maximum aggregate size 1mm, also referred to as High Performance Mortar) comes in conjunction with composite thin plate is formed to RC
A kind of novel reinforced technology of the structural elements such as beam, plate, the column of structure progress reinforcement.The reinforcement technique has the following advantages that：
(1) TRC is analogous to a kind of inorganic compounding gel rubber material of ferro-cement, adds with the FRP of glue leaching matrix
Gu material is compared, mortar as having better compatibility, harmony and interpenetrating property between inorganic gel materials, with substrate, and
And anti-aging, fire resisting, durability are more preferable, compensate for FRP material and are not suitable for lacking for moist matrix surface and low temperature environment
It falls into, while also eliminating the use of high cost binder in the technology for applying of interface, and avoid because organic using epoxy resin
A series of problems brought by glue caking agent；
(2) due to answering fibrous material with the most use in civil engineering --- carbon fiber price is higher, uses TRC phase
There are biggish economic advantages than FRP；
(3) it is not corroded in concrete due to non-metallic fibers fabric, this is just eliminated is arranged traditional protection in TRC
Layer, therefore TRC composite material can be made very thin thin-plate element, thinness is even up to 10mm[1], on the one hand effectively limit
The increase of original structure self weight, on the other hand also maintains the sectional dimension of original structure；
(4) due to TRC fine aggregate) partial size is smaller, the fabric interlayer spacing being laid with can be less than 2mm, can easily into
Row paved in multi-layers, to meet the needs of reinforcing layer bearing capacity；
(5) fabric in composite material can be laid with (such as on main Impact direction according to the difference of carrying
When document [2] is enhanced using orthogonal carbon/glass bidirectional fabric, carbon fibre fabric is just arranged in the direction that component bears pulling force
On), the advantage of fabric can be given full play to, this multidirectional fabric can at most be weaved on four Impact directions[3]。
According to the These characteristics of TRC web braces technology, such reinforcement technique can be affirmed with good application prospect.
Currently, typically TRC thin plate is pasted on when carrying out anti-bend reinforced to RC beam using TRC web braces technology
Beam bottom, this reinforcement means is since the modular ratio reinforcing bar of used fabric web is much higher, ultimate deformation ability compares reinforcing bar
It is much lower, though therefore reinforce back rest bearing capacity be improved largely, (as described in document [2]), therefore ductility is greatly lowered
How to improve the ductility of the reinforcing back rest is such reinforcement technique problem to be solved.
Bibliography：
[1] Ortlepp R, Hampel U, Curbach M.A new approach for evaluating bond
Capacity of TRC strengthening [J] .Cement&Concrete Composites, 2006,28 (7)：589-
597.
[2] Xun Yong；Zhi Zhengdong；Duty fabric enhancing concrete thin plates reinforcement of rc beam Test for Bending Behavior is opened to grind
Study carefully [J] building structure journal, 2010,31 (3)：70-76.
[3] A.Bruckner, R.Ortlepp, M.Curbach.Anchoring of shear strengthening
for T-beams made of textile reinforced concrete(TRC)[J].Materials and
Structures, 2007.
Summary of the invention
Currently, typically TRC thin plate is pasted on when carrying out anti-bend reinforced to RC beam using TRC web braces technology
Beam bottom, this reinforcement means is since the modular ratio reinforcing bar of used fabric web is much higher, ultimate deformation ability compares reinforcing bar
It is much lower, though therefore reinforce back rest bearing capacity be improved largely, ductility is greatly lowered.
The purpose of the present invention is to provide a kind of using the TRC slab beam side method for strengthening for successively retreating lapping, it is characterized in that：
The following bonding partially TRC thin plate (as shown in Fig. 1) of natural axis in RC beam two sides has been laid with multilayer fabric in TRC thin plate used
Net, the fabric web being laid with successively are retreated since beam bottom along deck-molding, backstep away between 2mm to 5mm (such as 2 institute of attached drawing
Show).This method ensures while effectively improving RC load bearing beam power reinforces the good ductile performance of the back rest.
The technical scheme is that：
It is carried out using the two sides that the layer-by-layer TRC thin plate for retreating lapping is pasted onto RC beam it is anti-bend reinforced, by keeping TRC thin
The longitudinal fiber bundle of fabric web and reinforcing bar bear pulling force jointly to improve beam anti-bending bearing capacity in plate, at the same by reinforcement by
Break the fibre bundle of fabric web in TRC thin plate gradually since the beam bottom to improve the ductility of beam, thus
Acquirement, which ensures to reinforce while effectively improving RC load bearing beam power the back rest, has the effect of good ductile performance.
Detailed description of the invention
Fig. 1 is the layer-by-layer TRC thin plate schematic diagram for retreating lapping provided by the invention；
Fig. 2 is that TRC slab beam provided by the invention side reinforces schematic diagram；
Fig. 3 is existing reinforced concrete beam arrangement of reinforcement provided by the invention.
Specific embodiment
In order to make the objectives, technical solutions, and advantages of the present invention clearer, with reference to embodiments, to the present invention
It is further elaborated.The specific embodiments described herein are merely illustrative of the present invention, is not used to limit this hair
It is bright.
A kind of TRC slab beam side method for strengthening using successively retrogressing lapping, specific embodiment are as follows：
Step 1 makes the TRC thin plate for successively retreating lapping, pours thin plate using fine concrete, and in thin plate middle berth
If multilayer fabric net, the fabric web being laid with successively is retreated the lower edge since thin plate by certain step pitch, as shown in Figure 1,
Thin plate conserves 28 days after making；
Step 2 pastes the caul plate area TRC to existing reinforced concrete beam two sides and carries out digging rough processing；
Step 3 pair chisel matte carries out watering wetting, and it is allowed to spontaneously dry；
Step 4 uses magnesium phosphate cement mortar to be pasted onto TRC thin plate, and existing reinforced concrete beam two sides are processed to be added
Gu region, and use clamp.The material group of the magnesium phosphate cement mortar becomes：Yellow sand 1800kg/m3, MgO666.7kg/
m3, SiO2 74.1kg/m3, retarder 22.2kg/m3, borax 15.0kg/m3, Na51.9kg/m3, KH2PO4 370.4kg/m3,
H2O 180.0kg/m3；
It dismantles after step 524 hour fixture.
Illustrate consolidation effect of the invention below with reference to test.
Test has made 3 reinforced beams altogether, and sectional dimension and arrangement of reinforcement are shown in attached drawing 3.Wherein 1 compares beam,
Remaining 2 make consolidation process, reinforcing scope in beam two sides：Deck-molding direction is natural axis with down toward beam bottom edge, beam length direction be across
It is middle to each 750mm in both ends.The reinforcing section of reinforcement carries out digging rough processing (chisel 3.17~3.62mm of rugosity H ≈).
The compressive strength of concrete of existing reinforced concrete beam is 27.2MPa, and the yield strength of 12 reinforcing bar of φ is
336.9N/mm2, ultimate strength 512.7N/mm2, the yield strength of 6 reinforcing bar of φ is 409.1N/mm2, ultimate strength be
622.3N/mm2.28 days cubic compressive strengths of fine concrete are 50.5MPa used in TRC thin plate.4 layers are laid in thin plate to knit
Object net, backstep is away from for 3mm.Fabric web mesh used is 5mm × 5mm, and Impact direction is carbon fiber, and elasticity modulus is
230GPa, single beam rove line density is 1600tex, tensile bearing capacity 2853N.
The results are shown in Table 1 for the bearing capacity and ductility that test obtains.
Table 1
As shown in Table 1：The ultimate bearing capacity of strenthening member 1 and 2 is respectively increased 21.9%, 20.2% than comparison component, ductility
Coefficient is declined slightly compared to comparison component, but remains to reach 4.8 or so, and consolidation effect is good.
The foregoing is merely illustrative of the preferred embodiments of the present invention, is not intended to limit the invention, all in essence of the invention
Made any modifications, equivalent replacements, and improvements etc., should all be included in the protection scope of the present invention within mind and principle.
Claims (2)
1. it is a kind of using the TRC slab beam side method for strengthening for successively retreating lapping, it is characterized in that：In RC beam two sides, stickup is equipped with more
The TRC thin plate that layer fabric web and the fabric web being laid with successively are retreated since beam bottom along deck-molding.
2. fabric web backstep is away between 2mm to 5mm in TRC thin plate as described in claim 1.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710328017.3A CN108868180B (en) | 2017-05-10 | 2017-05-10 | TRC thin plate beam side reinforcing method adopting layer-by-layer retreating lapping |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710328017.3A CN108868180B (en) | 2017-05-10 | 2017-05-10 | TRC thin plate beam side reinforcing method adopting layer-by-layer retreating lapping |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN108868180A true CN108868180A (en) | 2018-11-23 |
| CN108868180B CN108868180B (en) | 2022-06-14 |
Family
ID=64319318
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710328017.3A Expired - Fee Related CN108868180B (en) | 2017-05-10 | 2017-05-10 | TRC thin plate beam side reinforcing method adopting layer-by-layer retreating lapping |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN108868180B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112016149A (en) * | 2020-09-01 | 2020-12-01 | 西南交通大学 | Flexural reinforcement RC beam bearing capacity solving method, electronic equipment and readable storage medium |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102995789A (en) * | 2012-05-25 | 2013-03-27 | 北京工业大学 | Built-in section steel column-lattice steel beam-mesh steel support concrete wall body and manufacturing method |
| EP2586935A1 (en) * | 2011-10-28 | 2013-05-01 | UAB "Leonard, Gef Baltic, Gef" | Method for reinforcing a wall structure and corresponding reinforcement system |
| CN104763163A (en) * | 2015-01-26 | 2015-07-08 | 盐城工学院 | Method and process for reinforcing RC (Reinforced Concrete) beam of E-glass fiber fabric reinforced magnesium phosphate cement-based concrete thin-slab |
| CN205743928U (en) * | 2016-06-30 | 2016-11-30 | 吴镇 | Shallow buried type magnesium iron frame type reinforced concrete combination tunnel wallboard |
-
2017
- 2017-05-10 CN CN201710328017.3A patent/CN108868180B/en not_active Expired - Fee Related
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP2586935A1 (en) * | 2011-10-28 | 2013-05-01 | UAB "Leonard, Gef Baltic, Gef" | Method for reinforcing a wall structure and corresponding reinforcement system |
| CN102995789A (en) * | 2012-05-25 | 2013-03-27 | 北京工业大学 | Built-in section steel column-lattice steel beam-mesh steel support concrete wall body and manufacturing method |
| CN104763163A (en) * | 2015-01-26 | 2015-07-08 | 盐城工学院 | Method and process for reinforcing RC (Reinforced Concrete) beam of E-glass fiber fabric reinforced magnesium phosphate cement-based concrete thin-slab |
| CN205743928U (en) * | 2016-06-30 | 2016-11-30 | 吴镇 | Shallow buried type magnesium iron frame type reinforced concrete combination tunnel wallboard |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112016149A (en) * | 2020-09-01 | 2020-12-01 | 西南交通大学 | Flexural reinforcement RC beam bearing capacity solving method, electronic equipment and readable storage medium |
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| Publication number | Publication date |
|---|---|
| CN108868180B (en) | 2022-06-14 |
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Granted publication date: 20220614 |