CN101691817B - Method for additionally anchoring reinforced concrete beam strengthened with FRP cloth material in anti-bending way - Google Patents
Method for additionally anchoring reinforced concrete beam strengthened with FRP cloth material in anti-bending way Download PDFInfo
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- CN101691817B CN101691817B CN2009101860470A CN200910186047A CN101691817B CN 101691817 B CN101691817 B CN 101691817B CN 2009101860470 A CN2009101860470 A CN 2009101860470A CN 200910186047 A CN200910186047 A CN 200910186047A CN 101691817 B CN101691817 B CN 101691817B
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Abstract
The invention discloses a method for additionally anchoring a reinforced concrete beam strengthened with an FRP cloth material in an anti-bending way, which belongs to the technical field of structural engineering. In the method, an internally-locking anchoring system is formed by opening a groove on the bottom surface of the reinforced concrete beam and embedding the FRP cloth material into the groove. The method comprises the following steps: opening the groove on the bottom surface of the reinforced concrete beam according to a required size and clearing groove dust; pre-treating the bottom surface of the reinforced concrete beam, grinding the bottom surface smoothly and grinding corners of the bottom surface into smooth chamfer angles; cutting the FRP cloth material as required, painting primers on the bottom surface of the reinforced concrete beam and in the groove and treating unsmooth parts by flattening glue; pasting two layers of unidirectional FRP cloth materials on the end parts of the bottom surface of the beam respectively, and then painting surface glue; and embedding the FRP cloth material on the bottom surface of the reinforced concrete beam and filling the groove with the surface glue so as to form the internally-locking anchoring system. The method is suitable for additionally anchoring the reinforced concrete beam strengthened with the FRP cloth material in the anti-bending way.
Description
Technical field
The present invention relates to the anti-bend reinforced reinforced concrete beam additional anchor of a kind of FRP cloth material method, belong to technical field of structural engineering.
Background technology
Fibre reinforced composites (FRP) reinforced steel concretes (R.C.) structure, have high-strength efficient, corrosion-resistant and good endurance, the deadweight that does not increase member and volume, widely applicable, tangible advantage such as construction is convenient, thereby bringing into play more and more important effect in structural strengthening transformation field.
FRP is applied in the R.C. structural strengthening, and a main aspect is that beam is anti-bend reinforced.But great deal of experimental shows, the beam of reinforcing with this method before the bearing capacity that reaches capacity early stage stripping damage usually takes place.Often can observe in the test, when stripping damage took place, the stress of cloth did not reach its tensile strength, even also is in lower stress level, and this destruction is very unexpected, belongs to brittle fracture.Stripping damage causes consolidation effect to reduce significantly, the intensity of FRP material is not fully utilized, this has limited the FRP material to a great extent and has reinforced applying of reparation field in civil engineering, how to suppress the key issue in the FRP reinforced concrete technology of becoming of stripping damage.And appropriate additional anchor measure is to avoid FRP cloth reinforcement that stripping damage takes place too early, improves the effective means of reinforced concrete beam ultimate bearing capacity, and can the quality of anchoring effect be directly connected to and realize the consolidation effect of expecting.
In order to suppress or avoid the generation of early stage stripping damage, adopted various additional anchor measure in the engineering practice, common have additional U type FRP hoop, additional steel plate U type hoop, FRP end add crab-bolt etc.But all there is certain deficiency in these additional anchor measures.U type FRP hoop can produce certain slippage along with peeling off of FRP material, and is on the corner being cut off easily, has greatly influenced anchoring effect; Adopt steel plate U type hoop, also there is comparatively complexity of stripping damage problem and the construction of steel plate U type hoop in steel plate itself; For additional crab-bolt anchoring, to have only when peeling off when developing into to a certain degree, crab-bolt can play certain inhibitory action to peeling off, and crab-bolt blocked the FRP silk at position of opening and can cause that stress concentrates, thus the destruction that causes the FRP of crab-bolt place material.Therefore, the novel additional anchor method of research and development is the effective way that addresses the above problem.
Summary of the invention
The objective of the invention is, the phenomenon of stripping damage takes place too early at FRP cloth reinforcement, propose the method for the anti-bend reinforced reinforced concrete beam additional anchor of a kind of FRP cloth material, prevent the generation of the early stage stripping damage of FRP cloth material, make full use of the high-strength advantage of FRP material.
Technical scheme of the present invention is, by at steel concrete soffit fluting, and the embedding of FRP cloth material is affixed in the groove, forms the internal lock anchoring system.Described method step is as follows:
(1) slots cleaning groove ash according to required size in the steel concrete soffit.
(2) preliminary treatment is carried out in the steel concrete soffit, polish flat, the corner polishing is smooth chamfering.
(3) cut out FRP cloth material as required, and in steel concrete bottom surface, groove the brushing primer, out-of-flatness place is handled with levelling glue.
(4) paste two layers of unidirectional FRP cloth material respectively in the end, soffit, brushing surface glue then, and the embedding of FRP cloth material is affixed on the steel concrete soffit, in groove, fill with face glue then and form the internal lock anchoring system.
Groove depth should not be less than 15mm, otherwise can't embed cloth, and can't guarantee cloth sticking Quality, the desirable thickness of concrete cover of maximum groove depth is generally 15mm-25mm.The groove width scope is advisable with 60mm to 100mm, and width is too narrow then is inconvenient to embed cloth, embeds quality and is difficult for guaranteeing; too widely then beam base concrete topping is caused than macrolesion; make cracking load low excessively, crack developing is too fast, causes cloth and concrete cover to peel off.Spacing between groove and the groove should should not surpass 400mm less than 250mm yet, and spacing is too little excessive to the concrete cover damage, and spacing too greatly then causes the lazy weight of slotting, and influences the effect of internal lock anchoring.
Be applicable to that the anti-bend reinforced FRP material that adopts of the inventive method mainly contains: as carbon fiber (CFRP), glass fiber (GFRP), aramid fiber (AFRP), basalt fibre (BFRP) etc.
The present invention's beneficial effect compared with the prior art is, adopt this method can strengthen FRP cloth and concrete sticky table area, inhibition is peeled off, improve the utilization rate of FRP material, simultaneously can reduce the surfacing workload of soffit, very little to former concrete damage, and with low cost, and it is convenient to construct.Can effectively improve the ultimate bearing capacity of reinforced concrete beam after employing this method.
The present invention is applicable to the additional anchor of the anti-bend reinforced reinforced concrete beam of FRP cloth material.
Description of drawings
Fig. 1 is the anti-bend reinforced reinforced concrete beam internal lock of a FRP cloth material anchoring system schematic diagram
Fig. 2 is the anti-bend reinforced reinforced concrete beam internal lock of a FRP cloth material anchoring system M-M cross sectional representation
Picture in picture number expression: (1) reinforced concrete beam; (2) fluting; (3) FRP cloth material; A:FRP cloth (0 ° of machine direction); B:FRP cloth (90 ° of machine directions)
The specific embodiment
At first slot according to size in the steel concrete soffit, the direction of groove is perpendicular to soffit length direction axis and keeps at a certain distance away, and the width of fluting is 80mm, and the degree of depth is 25mm, and the spacing between groove and the groove is 400mm.Clear up the groove ash after fluting is finished, and the soffit is polished flat, the polishing of notch corner is level and smooth chamfering with emery wheel.At soffit brushing primer, treat to use levelling glue with the place's levelling of surperficial concrete defect after primer curing is finished.Brushing surface glue then, at first paste the unidirectional fibre cloth material of two-layer different machine directions respectively in the end, soffit, and then paste anti-bend reinforced required unidirectional fibre cloth material, and the embedding of cloth material is affixed in the groove, the internal lock anchoring system formed with filling with glue in the groove at last.Experiment showed, that present embodiment adopts additional anchor method of the present invention, can effectively improve the ultimate bearing capacity of reinforced concrete beam.
Claims (2)
1. the anti-bend reinforced reinforced concrete beam additional anchor of FRP cloth material method, it is characterized in that described method is by slotting in the steel concrete bottom surface, the direction of groove is perpendicular to soffit length direction axis and keeps at a certain distance away, and the embedding of FRP cloth material is affixed in the groove, form the internal lock anchoring system;
Described method step is:
Slotting cleaning groove ash according to required size perpendicular to the steel concrete soffit of soffit length direction axis;
Preliminary treatment is carried out in the steel concrete soffit, polish flat, the corner polishing is smooth chamfering;
Cut out FRP cloth material as required, and in steel concrete bottom surface, groove the brushing primer, out-of-flatness place is handled with levelling glue;
Paste two layers of unidirectional FRP cloth material brushing surface glue and the embedding of FRP cloth material is affixed on the steel concrete soffit then in the end, soffit respectively, in groove, fill with face glue then and form the internal lock anchoring system.
2. the anti-bend reinforced reinforced concrete beam additional anchor of a kind of FRP cloth material according to claim 1 method, it is characterized in that, described method is at the groove depth 15mm-25mm of steel concrete bottom surface fluting, and groove width is 60mm-100mm, and the spacing between groove and the groove is 250mm-400mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009101860470A CN101691817B (en) | 2009-09-14 | 2009-09-14 | Method for additionally anchoring reinforced concrete beam strengthened with FRP cloth material in anti-bending way |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN2009101860470A CN101691817B (en) | 2009-09-14 | 2009-09-14 | Method for additionally anchoring reinforced concrete beam strengthened with FRP cloth material in anti-bending way |
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| Publication Number | Publication Date |
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| CN101691817A CN101691817A (en) | 2010-04-07 |
| CN101691817B true CN101691817B (en) | 2011-01-05 |
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| CN2009101860470A Expired - Fee Related CN101691817B (en) | 2009-09-14 | 2009-09-14 | Method for additionally anchoring reinforced concrete beam strengthened with FRP cloth material in anti-bending way |
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Families Citing this family (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101871267B (en) * | 2010-06-30 | 2011-08-31 | 西南科技大学 | Composite strengthening technology of aged reinforced concrete beam |
| CN101929253B (en) * | 2010-09-01 | 2011-10-05 | 中南大学 | Method for anchoring fiber sheet by using parallel double rods |
| CN104100100B (en) * | 2014-07-14 | 2016-03-02 | 扬州大学 | The method of Tests of Reinforced Concrete Beams Strengthened With Cfrp-laminate is drawn in micro-varicose |
| CN104895344A (en) * | 2015-05-13 | 2015-09-09 | 同济大学 | Reinforced concrete member reinforcement method and reinforced concrete reinforcement structure |
| CN105952180A (en) * | 2016-05-31 | 2016-09-21 | 广东工业大学 | Method for reinforcing concrete structure through embedded wet and sticky FRP strips and component of method |
| CN106012712A (en) * | 2016-07-05 | 2016-10-12 | 北京交通大学 | Reinforcing method of straddle type monorail traffic rail beam |
| CN110894754A (en) * | 2018-09-12 | 2020-03-20 | 上海天补材料科技有限公司 | Concrete crack treatment technology |
| CN109457992B (en) * | 2018-10-30 | 2021-10-08 | 兰州大学 | Method for sticking reinforced concrete structure outside body with anchor |
| CN109457991B (en) * | 2018-10-30 | 2021-10-08 | 兰州大学 | Method for embedding reinforced concrete structure on surface layer of anchored carbon fiber |
| CN109555331A (en) * | 2018-11-26 | 2019-04-02 | 广东工业大学 | A kind of anchor structure and construction method promoting beams of concrete Flexural strength efficiency |
| CN109989338B (en) * | 2019-04-29 | 2024-03-12 | 华北水利水电大学 | Bending-resistant reinforcement structure and method for concrete beam |
| CN110206337B (en) * | 2019-06-24 | 2020-12-22 | 重庆交通大学 | Metal anchoring part for anchoring fiber reinforced composite material and anchoring structure |
| CN111749147A (en) * | 2020-06-19 | 2020-10-09 | 河海大学 | Service-period cracking beam reinforced based on groove anchoring fiber cloth and reinforcing method thereof |
Citations (3)
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|---|---|---|---|---|
| CN1388848A (en) * | 2000-01-13 | 2003-01-01 | 伊默艾么阁有限公司 | External reinforcement for beams, columns, plates and the like |
| KR100769222B1 (en) * | 2006-10-16 | 2007-10-23 | 한국건설기술연구원 | Connection system for frp deck to girder |
| CN101144336A (en) * | 2007-08-28 | 2008-03-19 | 上海市建筑科学研究院(集团)有限公司 | Method for repairing and reinforcing wood beam by carbon fibre bar |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1388848A (en) * | 2000-01-13 | 2003-01-01 | 伊默艾么阁有限公司 | External reinforcement for beams, columns, plates and the like |
| KR100769222B1 (en) * | 2006-10-16 | 2007-10-23 | 한국건설기술연구원 | Connection system for frp deck to girder |
| CN101144336A (en) * | 2007-08-28 | 2008-03-19 | 上海市建筑科学研究院(集团)有限公司 | Method for repairing and reinforcing wood beam by carbon fibre bar |
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