CN101672110A - Method and structure for enhancing brickwork structure and improving earthquake resistant performance of structure by using carbon fiber - Google Patents
Method and structure for enhancing brickwork structure and improving earthquake resistant performance of structure by using carbon fiber Download PDFInfo
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- CN101672110A CN101672110A CN200910307310A CN200910307310A CN101672110A CN 101672110 A CN101672110 A CN 101672110A CN 200910307310 A CN200910307310 A CN 200910307310A CN 200910307310 A CN200910307310 A CN 200910307310A CN 101672110 A CN101672110 A CN 101672110A
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Abstract
The invention relates to a method and a structure for enhancing a brickwork structure and improving earthquake resistant performance of the structure by using carbon fiber. The method comprises the following steps of: step one, determining a part to be enhanced and reconstructed and pre-treating the surfaces of a brickwork; step two, coating binder on the surfaces of the brickwork; step three, sticking carbon fiber cloth tapes on the surfaces of the brickwork in a gridding shape and in a double-surface symmetrical manner; step four, drilling a through hole; step five, using a carbon fiber pinto pass through the through hole, infusing glue in the through hole and sticking the carbon fiber pin with the brickwork; step six, dispersing the two ends of the carbon fiber pin which are exposed from the brickwork in a strip shape, and respectively sticking and fixing the two ends with the carbon fiber cloth tapes on the two surfaces of the brickwork in a petal shape; and step seven, additionally sticking a piece of glue-coated carbon fiber cloth in an each area in which strips are stuck. The method solves the technical problem that the carbon fiber cloth tapes on the two surfaces of the brickwork lack organic linkage and can not ensure the cooperative work of the carbon fiber cloth tapes and the brickwork structure. The adoption of the method can effectively enhance the whole earthquake resistant performance of the brickwork structure. Meanwhile, the method also has the advantages of simple and convenient construction, short construction period, no original space occupation, no load added to the structure or a foundation and low investment.
Description
Technical field
The present invention relates to the method for a kind of reinforcing masonry structure, raising masonry anti-seismic performance, belong to building aseismicity strengthening reconstruction field.
Background technology
Masonry structure is industry and the civilian construction field that is widely used in China.But because the masonry structure building material belongs to fragility character, its tension shearing resistance and flexural strength are all lower and deadweight is bigger; In addition, masonry structure building occurs early, and many masonry structures have only considered gravity load and wind load and do not considered seismic load when initial design, and masonry strength is low, and construction measures such as ring beam structure post lack.So in general, masonry structure building body of wall anti-seismic performance is relatively poor, in case stronger earthquake takes place, its earthquake is often comparatively serious.Therefore it is huge the masonry structure body of wall that can not satisfy shockproof requirements at present to be carried out seismic hardening, and very necessary.Yet the traditional Shockproof reinforcing method of masonry structure body of wall adopts the ferro-cement surface layer usually or sprays cast-in-situ reinforced concrete slab wall (common name clamping plate wall) in conjunction with the method for setting up reinforced concrete structural column and collar tie beam; The bearing capacity that these methods can improve structure to a certain extent improves anti-seismic performance, satisfies the requirement of predetermined function of use.But there is long construction period in these reinforcement means, increases structure and ground load, take architectural space and cause existing line equipment to be shifted, to invest shortcomings such as big in a large number.
Summary of the invention
In order to solve the long construction period that the traditional Shockproof reinforcing method of traditional reinforcing masonry structure body of wall exists, increase structure and ground load, take architectural space and cause existing line equipment to be shifted in a large number, invest shortcomings such as big, for the carbon fiber strap that solves the masonry two sides lacks organic connections, can not ensure the technical problem of carbon fiber strap and masonry structure collaborative work, the present invention proposes a kind of method and structure that adopts the carbon fiber reinforcement masonry structure to improve structural seismic performance, it uses ripe carbon fibre material to adopt body of wall intersection affixing carbon fabric band, body of wall border affixing carbon fabric band reproduces constructional column collar tie beam way the masonry structure body of wall is carried out seismic hardening, this method easy construction, duration is short, do not occupy former having living space, do not increase structure and ground load, small investment.
Its technical scheme is as follows:
A kind of method that adopts the carbon fiber reinforcement masonry structure to improve structural seismic performance is characterized in that concrete steps are as follows:
Step 1: the shear behavior that requires the checking computations masonry structure according to seismic design, determine masonry structure body of wall shear behavior weak part according to earthquake resistant design code, thereby determine position, preliminary treatment is carried out in the efflorescence and the masonry surface of being corroded with carbon fiber strap strengthening reconstruction masonry structure;
Step 2: at the external coating cementing agent of transformation masonry structure that needs reinforcement;
Step 3: be latticed two-sided symmetrical affixing carbon fabric band on the surface of masonry;
Step 4: drill through the hole on the masonry surface that pastes the carbon fiber strap;
Step 5: pass through hole on the masonry with the carbon fiber pin, inject epoxy resin structural adhesive in the through hole, carbon fiber pin and masonry bond together;
Step 6: the two ends that the carbon fiber pin exposes masonry are strip of sheet scatters, and is petal and pastes fixing with the carbon fiber strap drawknot on masonry two sides respectively;
Step 7: paste fixing zone at above-mentioned silver and stick on a gluing carbon cloth again.
The nail bar of described carbon fiber pin is to be rolled by one section reinforcing bar of carbon cloth strap clamp to form, after the nail bar of carbon fiber pin penetrates masonry, extract reinforcing bar out, two ends are exposed at the masonry outside, the two ends of carbon fiber pin is cut into strip shape, and the carbon fiber strap that the end silver is petal expansion, paste above with masonry is pasted fixing.
A kind of structure that adopts the carbon fiber reinforcement masonry structure to improve structural seismic performance, be latticed two-sided symmetrical affixing carbon fabric band at the reinforcing position on masonry surface, it is characterized in that: on the masonry that pastes the carbon fiber strap, be drilled with through hole, in the carbon fiber pin receiving through-hole, inject epoxy resin structural adhesive in the through hole, pin and masonry bond together, the carbon fiber pin two ends that expose the masonry outside is the strip shape that is cut into, the end silver is petal expansion, fixing with carbon fiber strap 1 stickup that masonry is pasted above, FX is added a cover a gluing carbon cloth again.
The reinforcing position on described masonry surface comprises on the metope of masonry structure masonry, on the metope at intersection, two body of wall intersections, body of wall corner and the contiguous door and window hole place of body of wall and floor intersection, body of wall and post.
Described cementing agent is a modified epoxide resin adhesive.
Described carbon fiber strap is to be latticed anyhow two-sided symmetry to paste on the surface of masonry, or be the two-sided symmetry of oblique trellis and paste, or be anyhow the two-sided symmetry of grid+diagonal angle oblique line mixing shape grid and paste the edge sealing carbon fiber strap that sticking area has a trap to close.
Described carbon fiber strap is to paste along the vertical two sides of two masonry intersections, and the carbon fiber pin is single or double drawknot, forms T-shaped or the L shaped constructional column that reproduces, and when the carbon fiber strap was walked around the external corner stickup, the bilge radius at place, bead angle was not less than 20mm; Perhaps, described carbon fiber strap is to paste along body of wall and the horizontal two sides of floor intersection, and the carbon fiber pin is single or double drawknot, forms to reproduce collar tie beam.
Described carbon fiber strap sticks on the metope equal intervals and evenly arranges, the cloth bandwidth is less than 100mm, and the maximum net spacing is not more than 10 skin masonry height, also is not more than 600mm.
The overlap joint of described carbon fiber strap is long should not establish one the carbon fiber pin less than 200mm in the middle of overlap joint.
Described carbon fiber pin is single or double drawknot.
Beneficial effect of the present invention is as follows:
The present invention adopts carbon fiber pin drawknot at the position affixing carbon fabric band of transformation masonry structure body of wall that needs reinforcement between the two sides carbon fiber strap during stickup, make carbon cloth belt restraining body of wall.The method can stop carrying out of masonry structure wall body slit, has improved the stress of masonry structure body of wall and has improved shear-carrying capacity, has avoided when load reaches capacity state, owing to the brittle fracture of brickwork causes integrally-built unexpected destruction.Formed respectively between carbon fiber strap, carbon fiber pin and the original masonry structure body of wall and had reproducing constructional column, reproducing collar tie beam of steel concrete performance, strengthened the whole anti-seismic performance of structure.
Carbon fiber pin feature of the present invention is simple, make easily, easy construction, carbon fiber pin both ends stick on the carbon fiber strap outside of reinforcing masonry structure in the form of sheets, the carbon fiber strap and the masonry structure that can effectively ensure the masonry two sides fuses, collaborative work, make carbon cloth belt restraining body of wall, effectively stop carrying out of masonry structure wall body slit, improved the stress of masonry structure body of wall, and improved shear-carrying capacity, avoided when load reaches capacity state, owing to the brittle fracture of brickwork causes integrally-built unexpected destruction.
Adopt the carbon fiber reinforcement masonry structure to improve the method and structure of structural seismic performance, have easy construction, duration weak point, do not occupy former have living space, do not increase structure and advantages such as ground load and small investment.
Description of drawings
Fig. 1 is the elevation that carbon fiber strap and carbon fiber pin are reinforced masonry;
Fig. 2 is the sectional drawing that carbon fiber strap and carbon fiber pin are reinforced masonry;
Fig. 3 is the schematic diagram that the carbon fiber strap is connected with the carbon fiber dowel ends;
Fig. 4 reproduces the cross-sectional view of collar tie beam reinforcing masonry for carbon fiber strap and carbon fiber pin;
Fig. 5 reproduces the elevation of collar tie beam reinforcing masonry for carbon fiber strap and carbon fiber pin;
Fig. 6 reproduces the constructional drawing of T-shaped reinforcing masonry for carbon fiber strap and carbon fiber pin;
Fig. 7 reproduces the constructional drawing of L font reinforcing masonry for carbon fiber strap and carbon fiber pin;
Fig. 8 is the schematic diagram that latticed anyhow two-sided symmetry is pasted for the carbon fiber strap on the surface of masonry;
Fig. 9 is the schematic diagram that oblique latticed two-sided symmetry is pasted for the carbon fiber strap on the surface of masonry;
Figure 10 is the schematic diagram that the two-sided symmetry of hybrid network trellis is pasted for the carbon fiber strap on the surface of masonry.
Figure 11 is the schematic diagram of carbon fiber pin.
Reference numeral: 1-carbon fiber strap; The 2-masonry; The 3-window; The 4-door; 5-carbon fiber pin; The 6-floor.
The specific embodiment
Below in conjunction with accompanying drawing to the present invention to specifying:
As Figure 1-3, the method for carbon fiber reinforcement masonry structure body of wall anti-seismic performance of the present invention, the concrete steps of its strengthening reconstruction are as follows:
Step 1: the shear behavior that requires the checking computations masonry structure according to seismic design, determine masonry structure body of wall shear behavior weak part according to earthquake resistant design code, thereby determine position with carbon fiber strap strengthening reconstruction masonry structure body of wall, the efflorescence and the masonry surface of being corroded are handled, reached the requirement of affixing carbon fabric.Treating method can adopt the polymerization sand finish, rejects weathering, corrosion part or rejects the dark-grey seam of 20mm ~ 30mm, the jointing of wiping one's face again.Carry out carbon fiber reinforcement after the surfacing again.The masonry of heavy corrosion or efflorescence should not adopt affixing carbon fabric to reinforce.
Step 2: at the even brushing cementing agent in two sides at transformation masonry structure body of wall position that needs reinforcement.Carbon cloth is pasted and to be sticked with glue agent, must carry out the security performance check, and its test rating: the bonding shear strength standard value should be according to confidence level c=0.90, and fraction is that 95% requirement is carried out.The bonding adhesive of dipping, bonded carbon cloth must adopt the modified epoxide resin adhesive of special preparation, and its safe performance indexes must meet the regulation of table 1, table 2.To the inaccurate unsaturated polyester resin that uses of the seismic hardening of masonry structure supporting member, alkyd resins etc. are made dipping, adhesive glue stick.
Table 1 carbon cloth dipping, bonding adhesive material safe performance indexes
Table 2
Step 3: at the two sides of body of wall 2 symmetry affixing carbon fabric band 1, during stickup, the carbon fiber strap is 1 exceptionally straight, even up.The carbon fibre material performance must meet the following requirements: the carbon fiber that the supporting member seismic hardening is selected for use is polypropylene-base (PAN yl) 12k or the following little bunch fiber of 12k, the big bunch fiber of strict forbidding; The mechanical property of carbon fiber should meet the regulation of table 3.
Table 3 carbon cloth designing and calculating index minimum
Referring to Fig. 4 Fig. 7, described carbon fiber strap 1 is to paste along the vertical two sides of two masonry intersections, and carbon fiber pin 5 is single or double drawknot, forms T-shaped or the L shaped constructional column that reproduces, when carbon fiber strap 1 was walked around the external corner stickup, the bilge radius at place, bead angle was not less than 20mm; Perhaps, described carbon fiber strap 1 is to paste along body of wall and the horizontal two sides of floor 5 intersections, and carbon fiber pin 5 is single or double drawknot, forms to reproduce collar tie beam.The overlap joint of described carbon fiber strap is long should not establish one the carbon fiber pin less than 200mm in the middle of overlap joint.
Form respectively between carbon fiber strap 1, carbon fiber pin 5 and the original masonry structure body of wall 2 and have reproducing tee T or L type constructional column, reproducing collar tie beam of steel concrete performance, strengthen the whole anti-seismic performance of structure.
Described carbon fiber strap sticks on the metope equal intervals and evenly arranges, the cloth bandwidth is less than 100mm, and the maximum net spacing is not more than 10 skin masonry height, also is not more than 600mm.
The carbon cloth of bottom should extend to collar tie beam position, masonry structure ground, pastes with the ground collar tie beam.Press the knot sheet can select 20mm for use? the mm steel plate adds nailing with stickup and fixes.
The constructional column that reproduces herein is not limited to tee T or L type in this specific embodiment, and the body of wall of other any pattern has a common boundary the formed veriform constructional column that reproduces of structure also all in protection scope of the present invention.Its concrete form can be determined according to concrete requirement of engineering.
Referring to Fig. 8, described carbon fiber strap 1 is to be latticed anyhow two-sided symmetry to paste the edge sealing carbon fiber strap that sticking area has a trap to close on the surface of masonry 2.
Referring to Fig. 9, described carbon fiber strap 1 is to be the two-sided symmetry of oblique trellis to paste the edge sealing carbon fiber strap that sticking area has a trap to close on the surface of masonry 2.
Referring to Figure 10, described carbon fiber strap 1 is to be the two-sided symmetry stickup of grid+diagonal angle oblique line mixing shape grid anyhow, the edge sealing carbon fiber strap that sticking area has a trap to close on the surface of masonry 2.
The method of affixing carbon fabric: the carbon cloth that will cut in advance immediately behind the brushing bottom dipping glue is laid on the bottom dipping glue equably.With the rubber squeegee of special use or rubber cylinder along machine direction roll extrusion or strickling, should note not roll extrusion back and forth, should wipe off, get rid of bubble and unnecessary glue along a direction roll extrusion, make dipping glue fully permeate carbon cloth and with the body structure surface strong bond, roll extrusion must not damage carbon fiber when wipeing off.
Smear upper strata dipping glue.After treating the carbon cloth dry to touch, glue is flooded in brushing on the carbon fiber cloth cover again.
Maintenance, curing: need carry out maintenance under certain condition after carbon cloth is pasted and reach needed hardness.
When environment temperature remains on more than 20 ℃, generally needed solidify in 24 hours, having can bearing load after 5～7 days after the certain degree of hardness.Should prevent to drench with rain or make moist after carbon cloth is pasted, and prevent that dust storm, pollutant from making dirty and protect working face not damaged by hard thing.
Step 4: drill through the hole on the masonry surface that pastes the carbon fiber strap.
Step 5: pass through hole on the masonry with carbon fiber pin 5, inject epoxy resin structural adhesive in the through hole, carbon fiber pin and masonry bond together.
Step 6: the two ends that carbon fiber pin 5 exposes masonry are strip of sheet scatters, and is petal and pastes fixing with the carbon fiber strap drawknot on masonry two sides respectively.
Step 7: paste fixing zone at above-mentioned silver and stick on a gluing carbon cloth again.
The patch area occupation ratio:
The patch area should be deducted overlapping area, does not comprise the edge sealing area;
Pin density is:
(/ square metre).
Referring to Figure 11, carbon fiber pin 5 is to be cut into 100mm * 640mm specification with carbon cloth, is rolled into the fiber pin of diameter less than 12mm then.Its end silver launches to paste and is radiation on the wall.The diameter of carbon fiber pin (6-8) mm long is h+400mm, and wherein h is a masonry thickness, will follow closely in the middle of the body the long section of h and soak into the dipping bonding adhesive and solidify to form strongly, and each 200mm of two ends is with plastics fabric width tightly (preventing that viscose glue from entering).After pin completes, pasting the masonry surface drilling of carbon cloth, the aperture is (12-15) mm, pin is inserted in the hole after having bored the hole, and inject epoxy resin structural adhesive in the hole, guarantees that pin and masonry bond together.The 200mm long pin plastic sheath that the metope both sides are exposed removes, and the carbon fiber wire fanning, sticks on the carbon cloth, add a cover a 250mm again? the gluing carbon cloth of 50mm is promptly finished the layout of pin.
The making of carbon fiber pin and stickup: the carbon fiber pin that the sheet material of the carbon fiber specification that cuts is rolled into diameter (6-8) mm, penetrate in the porthole of having accomplished fluently, carbon fiber pin exposed parts each 200mm of both sides, to expose coiled material then is cut into the trumpet flower flap and is distributed to body of wall around the hole, adopt the gluing affixing carbon fabric outside that is affixed on of HYW-CQ, perfusion HYW-CQ fills up the hole internal diameter and gets final product in the hole.
Claims (10)
1. method that adopts the carbon fiber reinforcement masonry structure to improve structural seismic performance is characterized in that concrete steps are as follows:
Step 1: the shear behavior that requires the checking computations masonry structure according to seismic design, determine masonry structure body of wall shear behavior weak part according to earthquake resistant design code, thereby determine position, preliminary treatment is carried out in the efflorescence and the masonry surface of being corroded with carbon fiber strap strengthening reconstruction masonry structure;
Step 2: at the external coating cementing agent of transformation masonry structure that needs reinforcement;
Step 3: be latticed two-sided symmetrical affixing carbon fabric band (1) on the surface of masonry (2);
Step 4: drill through the hole on the masonry surface that pastes the carbon fiber strap;
Step 5: pass through hole on the masonry with carbon fiber pin (5), inject epoxy resin structural adhesive in the through hole, carbon fiber pin and masonry bond together;
Step 6: the two ends that carbon fiber pin (5) exposes masonry are strip of sheet scatters, and is petal and pastes fixing with the carbon fiber strap drawknot on masonry two sides respectively;
Step 7: paste fixing zone at above-mentioned silver and stick on a gluing carbon cloth again.
2. employing carbon fiber reinforcement masonry structure as claimed in claim 1 improves the method for structural seismic performance, it is characterized in that: the nail bar of described carbon fiber pin (5) is to be rolled by one section reinforcing bar of carbon cloth strap clamp to form, after the nail bar of carbon fiber pin penetrates masonry, extract reinforcing bar out, two ends are exposed at the masonry outside, the two ends of carbon fiber pin is cut into strip shape, and the carbon fiber strap (1) that the end silver is petal expansion, paste above with masonry is pasted fixing.
3. structure that adopts the carbon fiber reinforcement masonry structure to improve structural seismic performance, be latticed two-sided symmetrical affixing carbon fabric band (1) at the reinforcing position on masonry surface, it is characterized in that: on the masonry that pastes the carbon fiber strap, be drilled with through hole, in carbon fiber pin (5) receiving through-hole, inject epoxy resin structural adhesive in the through hole, pin and masonry bond together, the carbon fiber pin two ends that expose the masonry outside is the strip shape that is cut into, the end silver is petal expansion, fixing with carbon fiber strap 1 stickup that masonry is pasted above, FX is added a cover a gluing carbon cloth again.
4. employing carbon fiber reinforcement masonry structure as claimed in claim 3 improves the structure of structural seismic performance, it is characterized in that: the reinforcing position on described masonry surface comprises on the metope of masonry structure masonry, intersection, two body of wall intersections, the body of wall corner of body of wall and floor intersection, body of wall and post and be close on the metope at door and window hole place.
5. employing carbon fiber reinforcement masonry structure as claimed in claim 3 improves the structure of structural seismic performance, it is characterized in that: the reinforcing position on described masonry surface comprises on the metope of masonry structure masonry, intersection, two body of wall intersections, the body of wall corner of body of wall and floor intersection, body of wall and post and be close on the metope at door and window hole place.
6. employing carbon fiber reinforcement masonry structure as claimed in claim 3 improves the structure of structural seismic performance, it is characterized in that: described carbon fiber strap (1) is to be latticed anyhow two-sided symmetry to paste on the surface of masonry (2), or be the two-sided symmetry of oblique trellis and paste, or be anyhow the two-sided symmetry of grid+diagonal angle oblique line mixing shape grid and paste the edge sealing carbon fiber strap that sticking area has a trap to close.
7. employing carbon fiber reinforcement masonry structure as claimed in claim 3 improves the structure of structural seismic performance, it is characterized in that: described carbon fiber strap (1) is to paste along the vertical two sides of two masonry intersections, carbon fiber pin (5) is single or double drawknot, form T-shaped or the L shaped constructional column that reproduces, when carbon fiber strap (1) was walked around the external corner stickup, the bilge radius at place, bead angle was not less than 20mm; Perhaps, described carbon fiber strap (1) is to paste along body of wall and the horizontal two sides of floor (5) intersection, and carbon fiber pin (5) is single or double drawknot, forms to reproduce collar tie beam.
8. employing carbon fiber reinforcement masonry structure as claimed in claim 3 improves the structure of structural seismic performance, it is characterized in that: described carbon fiber strap sticks on the metope equal intervals and evenly arranges, the cloth bandwidth is less than 100mm, and the maximum net spacing is not more than 10 skin masonry height, also is not more than 600mm.
9. employing carbon fiber reinforcement masonry structure as claimed in claim 3 improves the structure of structural seismic performance, it is characterized in that: the overlap joint of described carbon fiber strap is long should not establish one the carbon fiber pin less than 200mm in the middle of overlap joint.
10. employing carbon fiber reinforcement masonry structure as claimed in claim 3 improves the structure of structural seismic performance, and it is characterized in that: described carbon fiber pin (5) is single or double drawknot.
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