CN1414195A - Prestressed fibre reinforced steel concrete structure and its prestressed construction method - Google Patents
Prestressed fibre reinforced steel concrete structure and its prestressed construction method Download PDFInfo
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- CN1414195A CN1414195A CN 02133847 CN02133847A CN1414195A CN 1414195 A CN1414195 A CN 1414195A CN 02133847 CN02133847 CN 02133847 CN 02133847 A CN02133847 A CN 02133847A CN 1414195 A CN1414195 A CN 1414195A
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Abstract
The present invention relates to prestressed fibre-reinforced section steel concrete structure and its prestressing construction method. The present invention is mainly composed of fibre cloth, section steel and concrete. The invented prestressed fibre-reinforced section steel concrete structure possesses the advantages of light-weight, high rigidity, bearing capacity of heavy load, very large spanning ability, etc. Its construction method is simple, and the formed engineering structure performance is excellent.
Description
One, technical field
The invention belongs to building and civil engineering structures and job practices thereof, the engineering structures and the job practices thereof of specific (special) requirements particularly arranged.
Two, background technology
At present, in the civil construction project field, generally steel concrete of Shi Yonging and steel reinforced concrete structure have from shortcoming such as great, that span ability is little.Be that a kind of compressive property is fine owing to concrete again, and the material of tensile property very poor (being generally 2～5MPa), so breakage easy to crack.In addition, continuous development along with society, people have proposed new requirement to civil construction project, as structure want slim and graceful, the space is broad, supporting capacity also wants big or the like, so adopt common reinforced concrete structure and steel reinforced concrete structure just to be difficult to satisfy the needs of modern large scale civil engineering.And for steel reinforced concrete structure, during by the permissible stress method design, the plastic property of steel also is underutilized.
Three, summary of the invention
The objective of the invention is to make full use of the plastic property of steel and the mechanical property of cloth excellence, prestressed fibre reinforced steel concrete structure and job practices thereof are provided, make civil engineering structure have the high supporting capacity and the bigger rigidity of structure, increase application life, to satisfy the requirement of modern large scale civil engineering structure, satisfy the structure that specific (special) requirements is arranged especially, as from heavy and light, rigidity is big, sectional dimension is little, bigger span ability is arranged, the requirement of the structure of carrying of taking the weight.
The object of the present invention is achieved like this: structure of the present invention, mainly form, perhaps mainly form by cloth and shaped steel by cloth (as carbon cloth, high molecular polymer cloth, glass fabric etc.), shaped steel (as combining structure of steel plate, hot-rolled steel section, welding shaped steel and different shaped steel etc.) and concrete.By the fiber reinforcement type steel work that cloth and shaped steel are formed, be to utilize good plastic property of steel and the very high tensile strength (ultimate strength as carbon fiber is higher about 10 times than steel) of cloth, adopt the job practices of cloth enhanced type steel and form; If adopt the fiber reinforcement type steel work to strengthen the Concrete Construction method, just form the prestressed fibre reinforced steel concrete structure of forming by cloth, shaped steel, concrete.Flexibility, tensile strength height, modulus of elasticity are big, high temperature resistant because cloth has, antifatigue, corrosion-resistant, characteristics such as proportion is little, light weight, so fiber reinforcement type steel work and prestressed fibre reinforced steel concrete structure, have the higher ultimate bearing capacity and the bigger rigidity of structure, and improved the functional performance of civil engineering structure.The present invention also makes full use of the high-tensile characteristic and the good plastic property of steel of cloth, adopt prebuckling prestressing technique (comprising that reverse loading prebuckling prestressing technique, forward loading prebuckling prestressing technique, execution earlier oppositely load the prebuckling prestressing technique and implement forward loading prebuckling prestressing technique again) that cloth is carried out pretensioned job practices, form the prestressed fibre reinforced steel structure of forming by cloth and shaped steel; Strengthen concrete with the prestressed fibre reinforced steel structure again, also can adopt the prebuckling prestressing technique job practices of (comprising that reverse loading prebuckling prestressing technique or forward load the prebuckling prestressing technique), form the prestressed fibre reinforced steel concrete structure of forming by cloth, shaped steel and concrete again.Difference according to application target, can implement one or many prebuckling prestressing technique, thereby make above-mentioned engineering structures set up prestressing force, further improve the ultimate bearing capacity of engineering structures, and obtain the bigger rigidity of structure, thereby improved the functional performance of engineering structures.According to the difference of civil engineering structure requirement and the difference of structural element application target, can adopt above-mentioned different job practices, just can obtain above-mentioned different engineering structures.Job practices of the present invention and step: 1. job practices and the step of using the cloth enhanced type steel:
(1) the stickup face to shaped steel lower wing plate (referring to this structure when bending resistance is used, the frange plate of shaped steel tension one side) eliminate rust, polishing, cleaning;
(2) cementing agent is brushed equably on the stickup face of the shaped steel lower wing plate of handling;
(3) carbon cloth is laid on the cementing agent, and rolls, be depressed into cloth and fully impregnated in the cementing agent with cylinder;
(4) brushing impregnating resin on cloth again, and natural Health preservation.
2. strengthen the Concrete Construction method with the fiber reinforcement type steel work, the purpose difference according to using has dual mode:
(1) fiber reinforcement type steel work (promptly having pasted the shaped steel of cloth) is wrapped up with concrete and builds, just form pre-stress fibre and strengthen steel reinforced concrete structure;
(2) with concreting on the upper flange (referring to this structure when bending resistance is used, the frange plate of shaped steel pressurized one side) of fiber reinforcement type steel work, just form the prestressed fibre reinforced steel concrete iterative structure.
3. adopt the job practices and the step of prebuckling prestressing technique:
(1) oppositely load the job practices and the step of prebuckling prestressing technique:
1. shaped steel is oppositely loaded (being that loading direction is opposite with the action direction of normal service load), make the shaped steel lower wing plate (refer to the time spent of doing at normal service load, the frange plate of shaped steel tension one side) pressurized is near surrender, but to meet or exceed the yield limit of steel scarcely, make in its linear elasticity scope that is in steel; Keep the load of this moment constant;
2. under the reversed load hold mode, to the stickup face of shaped steel lower wing plate eliminate rust, polishing, cleaning;
3. under the reversed load hold mode, cementing agent is brushed equably on the stickup face of the shaped steel lower wing plate of handling;
4. under the reversed load hold mode, cloth is laid on the cementing agent, and rolls, be depressed into cloth and fully impregnated in the cementing agent with cylinder;
5. brushing impregnating resin on cloth again, and natural Health preservation;
6. after treating that cementing agent reaches full intensity, the slow added reversed load of removal.After institute added the load removal, steel work will restore to the original state, then cloth tension and make shaped steel lower wing plate pressurized, thus in structure, set up prestressing force.
(2) forward loads the job practices and the step of prebuckling prestressing technique:
1. to the fiber reinforcement type steel work or implemented the prestressed fibre reinforced steel structure or the prestressed fibre reinforced steel concrete structure of reverse loading prebuckling prestressing technique, apply forward load (being that loading direction is consistent with the action direction of normal service load), make shaped steel lower wing plate tension, the while cloth is tension also;
2. the forward load that applies should make shaped steel lower wing plate tension surpass its yield limit, produce plastic strain, but its plastic strain can not surpass cloth ultimate tensile strength value, can not surpass the ultimate tensile strength value of steel;
3. by instructions for use, after the forward loading makes the plastic strain of shaped steel lower wing plate develop into to a certain degree, the added forward load of removal lentamente, because the plastic strain of steel is expendable, therefore make cloth also produce the forced deformation that can not recover fully, so in structure, set up the prestressing force that produces by forward loading prebuckling;
The structure that 4. will produce plastic strain is placed 0 day to more than 300 days, because the flow harden characteristic of steel can make structure increase certain intensity.
Job practices of the present invention is simple, and this bright formed structure of job practices of employing has from heavy and light, rigidity is big, size is little, can take the weight to carry, and very big span ability is arranged, and has improved the advantages such as functional performance of member.The present invention can be applicable to the every field of civil construction, as striding industrial premises, Aircraft Hangar, large parking lot greatly, also can be applicable to house beam, plate; Also can be applicable to bridge, water conservancy project, subway and Light Rail Project; Even can be applicable to the part machinery manufacturing industry, as large-scale handling appliance, large ship, automobile; Or the like.
Four, description of drawings
Fig. 1 is the fibre reinforced steel structural representation;
Fig. 2 strengthens the steel reinforced concrete structure schematic diagram for pre-stress fibre;
Fig. 3 is a prestressed fibre reinforced steel concrete iterative structure schematic diagram;
Fig. 4 oppositely loads prebuckling pre-stressed construction method schematic diagram and I-I sectional view;
Fig. 5 loads prebuckling pre-stressed construction method schematic diagram and I-I sectional view for forward;
Fig. 6 is test beam member schematic diagram and I-I sectional view thereof.
Among the figure: 1-shaped steel combining structure, 2-cloth, 3-lower wing plate, 4-concrete, 5-shaped steel, 6-upper flange, 7-channel-section steel, the normal service load action direction of 8-, the reverse prebuckling loading direction of 9-, 10-forward prebuckling loading direction.
Five, the specific embodiment
Below in conjunction with embodiment, further specify the present invention.
Test beam member as shown in Figure 6, employing adds the structure that weldering one channel-section steel 7 combines on the upper flange 6 of i shaped steel 5, the height of combining structure is 140 millimeters, and the width of its lower wing plate 3 is 68 millimeters, the width of channel-section steel 7 is 63 millimeters, and the length of test beam is 2 meters.To this test beam carry out elder generation oppositely load after again forward load prebuckling prestressing technique construction sequence:
1. oppositely load prebuckling pre-stress construction step:
Load for convenience and affixing carbon fabric, the test beam member is turned over turnback, adopt the single-point loading scheme.
1. the shaped steel combining structure is oppositely loaded, when making its lower wing plate 3 tensions and reaching 0.9 times of steel yield strain, hold lotus;
2. hold under the lotus state oppositely loading, to the stickup face of the lower wing plate 3 of shaped steel combining structure eliminate rust, polishing, cleaning;
3. cementing agent is brushed equably on the stickup face of the lower wing plate of handling 3;
4. the carbon cloth with 0.111 millimeters thick is laid on the cementing agent, and rolls with cylinder, is depressed into carbon cloth and fully impregnated in the cementing agent;
5. brushing impregnating resin on carbon cloth again, and natural Health preservation.
6. natural Health preservation is after 6 days, slowly the added reversed load of removal.
Because the shaped steel combining structure will be recovered distortion, then in carbon cloth, produce pre-tensile stress, thus in total, produced prebuckling prestressing force.
2. forward loads prebuckling pre-stress construction step:
1. to implementing the test beam of reverse loading prebuckling pre-stress construction, implement two point forward loading schemes, make lower wing plate 3 and carbon cloth 2 tension simultaneously;
2. forward is loaded on lower wing plate 3 and enters the plastic zone;
3. treat forward load make shaped steel lower wing plate 3 produce plastic strain after, the added forward load of removal lentamente, and placing 20 days.
Because the plastic strain of steel can not recover fully, makes carbon cloth tension once more, thereby in the test beam member, set up forward loading prebuckling prestressing force.
Through after earlier oppositely again forward load the test beam member (abbreviating the PCFRS beam as) of the pre-stressed carbon fiber enhanced type steel structure behind the prebuckling pre-stress construction, carry out load test with cross section composition that does not have affixing carbon fabric and the duplicate shaped steel combining structure of size (abbreviating the contrast beam as), the result shows: under the identical situation of experiment condition, the ultimate load of contrast beam is 6.8 tons, and the PCFRS beam is after being loaded into 7.8 tons, the duty of carbon cloth is still good, also can continue carrying; In addition, the rigidity of member also improves a lot, and as under 6.0 tons of load actions, amount of deflection reaches 11.0 millimeters in the contrast girder span, and the PCFRS beam is about 9.0 millimeters.
Claims (6)
1. prestressed fibre reinforced steel concrete structure and pre-stressed construction method thereof, the composition of its structure mainly contains shaped steel (5), concrete (4), it is characterized in that cloth (2) in addition, by the fiber reinforcement type steel work that cloth and shaped steel are formed, be to use the job practices of cloth enhanced type steel to form; By the prestressed fibre reinforced steel concrete structure that cloth (2), shaped steel (5), concrete (4) are formed, be to strengthen the Concrete Construction method with the fiber reinforcement type steel work to form; And the prestressed fibre reinforced steel structure of forming by cloth and shaped steel, adopt oppositely load prebuckling prestressing technique or forward load the prebuckling prestressing technique or earlier oppositely the back forward job practices that loads the prebuckling prestressing technique form; The prestressed fibre reinforced steel concrete structure of forming by cloth, shaped steel and concrete, can also adopt reverse loading prebuckling prestressing technique or forward to load the prebuckling prestressing technique, strengthen the Concrete Construction method with the prestressed fibre reinforced steel structure and form.
2. according to described prestressed fibre reinforced steel concrete structure of claim 1 and pre-stressed construction method thereof, it is characterized in that described cloth (2) is carbon cloth or high molecular polymer cloth or glass fabric.
3. according to described prestressed fibre reinforced steel concrete structure of claim 1 and pre-stressed construction method thereof, it is characterized in that described job practices and step with the cloth enhanced type steel:
1. the stickup face to the lower wing plate (3) of shaped steel (5) eliminate rust, polishing, cleaning;
2. cementing agent is painted on equably on the stickup face of lower wing plate (3) of the shaped steel of handling (5);
3. cloth (2) is laid on the cementing agent, and rolls, be depressed into cloth (2) and fully impregnated in the cementing agent with cylinder;
4. go up the brushing impregnating resin in cloth (2) again, and natural Health preservation.
4. according to described prestressed fibre reinforced steel concrete structure of claim 1 and pre-stressed construction method thereof, it is characterized in that describedly strengthening the Concrete Construction method with the fiber reinforcement type steel work, be the fiber reinforcement type steel work to be wrapped up with concrete (4) build, or concrete (4) be cast on the upper flange (6) of the shaped steel (5) of pasting cloth (2).
5. according to described prestressed fibre reinforced steel concrete structure of claim 1 and pre-stressed construction method thereof, it is characterized in that the job practices and the step of described reverse loading prebuckling prestressing technique:
1. shaped steel (5) is oppositely loaded, lower wing plate (3) pressurized of shaped steel (5) is surrendered to approaching, but do not reach or be no more than the yield limit of steel, and keep load;
2. under the state that oppositely loads, to the stickup face of the lower wing plate (3) of shaped steel (5) eliminate rust, polishing, cleaning;
3. under the state that oppositely loads, cementing agent is brushed equably on the stickup face of the lower wing plate (3) of the shaped steel of handling (5);
4. cloth (2) is laid on the cementing agent, and rolls, be depressed into cloth (2) and fully impregnated in the cementing agent with cylinder;
5. go up the brushing impregnating resin in cloth (2) again, and natural Health preservation;
6. the slow added reversed load of removal.
6. according to described prestressed fibre reinforced steel concrete structure of claim 1 and pre-stressed construction method thereof, it is characterized in that described forward loads the job practices and the step of prebuckling prestressing technique:
1. to the fiber reinforcement type steel work of pasting cloth or prestressed fibre reinforced steel structure or the prestressed fibre reinforced steel concrete structure of having implemented reverse loading prebuckling prestressing technique, the execution forward loads, make the lower wing plate (3) and cloth (2) the while tension of shaped steel (5), its shaped steel lower wing plate (3) tension surpasses its yield limit and produces plastic strain, but can not surpass the ultimate tensile strength of cloth (2) and steel;
2. after treating that the forward loading makes shaped steel lower wing plate (3) produce plastic strain, the slow added forward load of removal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CNB021338477A CN1168880C (en) | 2002-09-28 | 2002-09-28 | Prestressed fibre reinforced steel concrete structure and its prestressed construction method |
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| Application Number | Priority Date | Filing Date | Title |
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| CNB021338477A CN1168880C (en) | 2002-09-28 | 2002-09-28 | Prestressed fibre reinforced steel concrete structure and its prestressed construction method |
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| CN1414195A true CN1414195A (en) | 2003-04-30 |
| CN1168880C CN1168880C (en) | 2004-09-29 |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1952260B (en) * | 2005-10-21 | 2010-08-18 | 同济大学 | Integrated whole-fiber reinforced plastic rail traffic structure |
| CN102704680A (en) * | 2012-06-25 | 2012-10-03 | 中铁十三局集团第四工程有限公司 | Film pasting method for sizing steel templates |
| CN106382017A (en) * | 2016-11-18 | 2017-02-08 | 南京工业大学 | Externally-adhered pre-tensioned FRP reinforcing beam, plate or combined structure thereof |
| CN108457195A (en) * | 2018-03-16 | 2018-08-28 | 广州市市政工程设计研究总院 | A kind of mixed composite beam bridge pre-bending construction method of steel- |
| CN109184077A (en) * | 2018-10-17 | 2019-01-11 | 中国铁路设计集团有限公司 | One kind, which is casted anchor, applies prestressed girder with rolled steel section en cased in concrete and its construction method |
| CN112414649A (en) * | 2020-11-17 | 2021-02-26 | 西安建筑科技大学 | Method for testing and evaluating effective prestress of simply supported beam/slab bridge based on beam slab overturning |
-
2002
- 2002-09-28 CN CNB021338477A patent/CN1168880C/en not_active Expired - Fee Related
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1952260B (en) * | 2005-10-21 | 2010-08-18 | 同济大学 | Integrated whole-fiber reinforced plastic rail traffic structure |
| CN102704680A (en) * | 2012-06-25 | 2012-10-03 | 中铁十三局集团第四工程有限公司 | Film pasting method for sizing steel templates |
| CN106382017A (en) * | 2016-11-18 | 2017-02-08 | 南京工业大学 | Externally-adhered pre-tensioned FRP reinforcing beam, plate or combined structure thereof |
| CN108457195A (en) * | 2018-03-16 | 2018-08-28 | 广州市市政工程设计研究总院 | A kind of mixed composite beam bridge pre-bending construction method of steel- |
| CN109184077A (en) * | 2018-10-17 | 2019-01-11 | 中国铁路设计集团有限公司 | One kind, which is casted anchor, applies prestressed girder with rolled steel section en cased in concrete and its construction method |
| CN109184077B (en) * | 2018-10-17 | 2023-05-09 | 中国铁路设计集团有限公司 | Steel reinforced concrete beam with prestressed lower anchor and construction method thereof |
| CN112414649A (en) * | 2020-11-17 | 2021-02-26 | 西安建筑科技大学 | Method for testing and evaluating effective prestress of simply supported beam/slab bridge based on beam slab overturning |
| CN112414649B (en) * | 2020-11-17 | 2022-10-21 | 西安建筑科技大学 | Simple beam/slab bridge effective prestress testing and evaluating method based on beam slab overturning |
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| Publication number | Publication date |
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| CN1168880C (en) | 2004-09-29 |
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