CN105350790A - Method for reinforcing reinforced concrete slab through prefabricating pre-stress TRC sheet - Google Patents
Method for reinforcing reinforced concrete slab through prefabricating pre-stress TRC sheet Download PDFInfo
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- 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
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Abstract
The invention discloses a method for reinforcing a reinforced concrete slab through prefabricating a pre-stress TRC sheet. The method comprises steps of the manufacturing of the pre-stress TRC sheet, interface processing and faceup construction. The method has advantages that: as TRC materials are high in plasticity and are easy to process, the TRC sheet is made in a bidirectional # shape, strips in the two directions can bear the force, and force-bearing demands of a reinforced concrete slab member are met; the TRC sheet is relatively thin and light, and the thickness and weight of the TRC sheet has little influence on the structural appearance and the using space; compared with reinforced concrete, the TRC sheet employs nonmetal fiber fabric and stainless steel, and an interface agent MPC is an inorganic material, so that the reinforcing method is quite suitable for a damaged RC structure in the corrosion environment by means of the interface processing manner; compared with a common fiber composite material cloth reinforcing structure, an alkali-resistant fiber web bearing the load is protected by a high-performance fine-aggregate concrete layer and cannot be easily influenced by scratch and fire hazards; by employing the TRC sheet to reinforce the reinforced concrete slab, the tensile property of the TRC materials can be fully utilized, and therefore the flexural bearing capacity is enhanced.
Description
Technical field
The invention belongs to building engineering structure field of reinforcement, particularly relate to a kind of method of precast prestressed TRC plate reinforced steel concrete plate.
Background technology
Due to the impact of the factors such as restriction service life, function change, disaster effect, construction quality, there is large amount of building and need reinforcement and repair in China.Tradition reinforcement means as: reinforcement method of enlarging section adds dead load, long construction period; Extension supporting system reinforcing method affects larger on constructional appearance and usage space; Fibrous composite (be called for short FRP) reinforcing method, reinforced with external steel encased etc. cannot solve the durability after structural strengthening and the problem such as high temperature resistant.Fabric Concrete Structure (TextileReinforcedConcrete, be called for short TRC) be by high-performance fine concrete and multiaxis alkali proof fiber net, as the advanced composite material (ACM) be combined into of carbon fiber, alkali-resistant glass fibre, basalt fibre etc., the advantages such as it has good supporting capacity, limit splits ability, the thin high-strength light of wall, corrosion-resistant and plasticity are strong, are usually used in light prefabricated component and structural strengthening field.Existing TRC materials application research is not also specifically related to the reinforcing of board member, existing cast-in-place TRC reinforcement means needs a large amount of constructions of facing upward, inconvenient operation, and use non-prestressed TRC web braces can not give full play to the tensile property of TRC material, consolidation effect is not good.
The prefabricated TRC plate reinforced steel concrete device of Chinese patent CN201310310742X mono-kind and interface processing method, solve the problem of reinforced concrete structure poor operability in the construction that to be used for by existing TRC material facing upward.Strengthened the performance of prefabricated TRC plate in the prior art by non-metallic fibers fabric, and adopt inorganic material as interfacial agents, the plate thus prepared has corrosion resistance, is specially adapted to the reinforced concrete structure reinforcing and repairing under corrosive environment.Compared with common fiber-reinforced resin cloth ruggedized construction, the alkali proof fiber net of bearing load is subject to the protection of high-performance fine concrete layer, is not vulnerable to the impact of scraping and fire.
But the prefabricated TRC plate reinforced steel concrete device disclosed in above-mentioned prior art has following deficiency: first, only adopt non-metallic fibers fabric, be also not enough to the stretch-proof performance strengthening prefabricated TRC plate; Adopt the TRC thin plate not Shi Hanzhang reinforced, the tensile strength of TRC material is not fully used, thus cannot bear more pulling force, consolidation effect is not good.
Summary of the invention
The technical problem that the present invention solves: a kind of anti-bending strength is strong in order to obtain, constructing operation of facing upward is convenient and the method for the armored concrete slab that consolidation effect is good, the invention provides a kind of method of precast prestressed TRC plate reinforced steel concrete plate.
To achieve these goals, the present invention is by the following technical solutions:
A method for precast prestressed TRC plate reinforced steel concrete plate, comprises and makes Prestressed T RC thin plate, interface processing, construction of facing upward; Described Prestressed T RC thin plate is made up of high performance composite mortar, alkali proof fiber net and stainless reinforcing bar, is specifically obtained by following steps:
(1) be cut into by alkali proof fiber net in length and breadth to the groined type shape respectively having 2 bands, the length L of band is consistent with the length being reinforced concrete slab (1), each strip width 350mm ~ 450mm, and band is in length and breadth to intersecting apart from 1/5L ~ 1/4L place, its end;
(2) stainless reinforcing bar is worn in the centre position of each band;
(3) at the high performance composite mortar of template upper 5mm ~ 7mm, the alkali proof fiber net cut in step (1) is placed in high performance composite mortar surface, and the end of alkali proof fiber net is placed in stretching pedestal, pedestal stretches alkali proof fiber net, keep extended state not loosen, control stress for prestressing is the TRC thin plate ultimate tensile strength of 0.3 ~ 0.5 times;
(4) pour into a mould 7mm ~ 9mm high performance composite mortar in a template, temperature be 20 DEG C ± 2 DEG C, humidity to be at least under the condition of 95% maintenance 28 days, loosens obtained " well " font Prestressed T RC thin plate of alkali proof fiber net.
According to the thickness being reinforced armored concrete slab, the tensile force namely born needed for TRC thin plate, the position that in adjustment above-mentioned steps (1), strip in length and breadth intersects, required for the tensile force that bears larger, intersection is got over away from end; Otherwise, needed for the tensile force that bears less, intersection is the closer to end.
In addition, wear stainless reinforcing bar in each band centre position, the stretch-proof performance of TRC thin plate can be strengthened thus improve consolidation effect; And the alkali proof fiber net that stretches on pedestal, and keep the state do not loosened can strengthen the stretch-proof performance of TRC thin plate further.Described high performance composite mortar commonly uses match ratio: cement (C): sand (S): water (W): Admixture (JM-PCA(I))=1:1.5:0.32:0.015.Cement is P. II 52.5 Portland cement.The medium sand in test sand to be fineness modulus be 2.6th II district, apparent density is 1.2g/cm
3.Water reducing agent is JM-PCA(I) type super plasticizer.
Wherein, described interface processing and work progress of facing upward are realized by following steps:
(1) be reinforced concrete slab surface cutter rough, expose concrete, formed " well " font cut a hole rough band;
(2) and cut a hole the end opens bolt hole of rough band at every bar, screw in stainless steel bolt, in bolt hole gap, pour into interfacial agents and treat that it solidifies;
(3) offer at the correspondence position of Prestressed T RC thin plate and roughly bring relative bolt hole with cutting a hole;
(4) brush away the rough dust brought of cutter and loosening aggregate, scrape embedding for interfacial agents in the rough band of cutter, smear and fill and lead up, thickness is 4mm ~ 8mm, so far completes interface process;
(5) contraposition of Prestressed T RC thin plate is labelled to step (4) process after be reinforced bottom concrete slab, knock Prestressed T RC thin plate make interfacial agents fill space, scrape off unnecessary interfacial agents;
(6) be stainless steel bolt tightening nuts, arrange that carpenters' clamp carries out anchoring, remove carpenters' clamp after maintenance and can complete work progress of facing upward.
In interface process, being reinforced, concrete slab surface cutter is rough, expose concrete, in subsequent process " well " font cutter is rough bring and smear interfacial agents time can bond with layer of concrete better, thus improve the adhesion strength of layer of concrete and interfacial agents.In addition, interfacial agents is determined according to the thickness of the reinforced concrete floor of required reinforcing at the rough smearing thickness brought of cutter, when the reinforced concrete floor needed reinforcement is thicker, then needs the smearing thickness increasing interfacial agents; Otherwise, then the smearing thickness of interfacial agents is reduced.
Face upward in work progress, layout carpenters' clamp is in order to fixing Prestressed T RC thin plate and be reinforced concrete slab, prevents Prestressed T RC thin plate before interfacial agents is not fully hardened from coming off.
As a preferred technical solution of the present invention, described alkali proof fiber net is carbon fiber, aramid fiber, basalt fibre or alkali-resistant glass fibre.
As a preferred technical solution of the present invention, stretch on pedestal in length and breadth to alkali proof fiber net in step (3) simultaneously.
As a preferred technical solution of the present invention, in step (4) temperature be 22 DEG C, humidity be the condition of 98% under maintenance 28 days, loosen alkali proof fiber net after 28 days and obtain the groined preload stress TRC thin plate that thickness is 12mm ~ 16mm.
As a preferred technical solution of the present invention, described bolt hole aperture is 10mm, and the degree of depth is 50mm.
As a preferred technical solution of the present invention, described interfacial agents is potassium magnesium phosphate cement.
Wherein, potassium magnesium phosphate cement is by sintered magnesia, soluble phosphate, Admixture and mineral admixture according to a certain percentage, and when there being water to exist, what reaction generated is the novel inorganic cementitious material of cohering phase with phosphate hydrate.Potassium magnesium phosphate cement, compared with other inorganic coagulation materials, has following special performance: (1) setting and harden is rapid, and early strength is high; (2) with the adhesion strength of old concrete is high, compatibility good; (3) permeability resistance strong, freeze thawing resistance, anti-salt freezes; (4) fire-proof high-temperature resistant.These advantages make potassium magnesium phosphate cement be used as the interfacial agents of reinforcement material, can Rapid-Repair structure, reach design strength requirement, save construction period in very short time.
beneficial effect
Compared with prior art, the present invention has the following advantages:
(1) method of precast prestressed TRC plate reinforced steel concrete plate of the present invention utilizes TRC material plasticity feature that is strong, that easily process, TRC thin plate is made two-way " well " font, the band in 2 directions can be stressed, meets the loading characteristic of steel concrete board member;
(2) TRC lamella thickness is little, 12mm ~ 16mm, lighter weight, affects little on constructional appearance and usage space;
(3) TRC thin plate is compared with steel concrete, owing to using non-metallic fibers fabric and stainless reinforcing bar, and interfacial agents MPC is inorganic material, reinforcement means adopts this interface processing mode to have corrosion resistance, the damage reinforced concrete structure under making reinforcement means be specially adapted to corrosive environment;
(4) be compared to common fibrous composite cloth ruggedized construction, the alkali proof fiber net of bearing load is subject to the protection of high-performance fine concrete layer, is not vulnerable to the impact of scraping and fire;
(5) compared with adopting cast-in-place or sprayed mortar reinforcing technique with existing TRC material, adopt the thin plate of prefabricated processing to site operation, decrease a large amount of constructions of facing upward, simple and convenient;
(6) compared with non-prestressed TRC web braces technology, Prestressed T RC thin plate is adopted can to make full use of the tensile strength of TRC material; Adopt non-prestressed TRC web braces, Stress resort is there is in TRC thin plate with the reinforcing bar being reinforced armored concrete slab, when causing gusset plate to destroy, the strain development of TRC thin plate is little, the tensile strength of TRC material is not fully used, adopt Prestressed T RC thin plate due to initial Shi Hanzhang, strain with the reinforcing bar being reinforced plate and differ little, when such gusset plate destroys, the strain of TRC thin plate is also higher, therefore can make full use of the tensile strength of TRC material.
(7) wear in carbon/glass fleece stainless reinforcing bar not only can when building composite mortar the fibroreticulate position of fixed carbon/glass, the rigidity of TRC thin plate can also be improved, be easy to transport, simultaneously can in ruggedized construction stand under load, play the effect of certain raising bearing capacity.
Accompanying drawing explanation
Fig. 1 is alkali proof fiber network plane figure;
Fig. 2 is gusset plate structural representation;
Wherein, 1 is be reinforced concrete slab; 2 is interfacial agents; 3 is high performance composite mortars; 4 is alkali proof fiber nets; 5 is stainless reinforcing bars; 6 is stainless steel bolts.
Detailed description of the invention
embodiment 1
A method for precast prestressed TRC plate reinforced steel concrete plate, comprises and makes Prestressed T RC thin plate, interface processing, construction of facing upward; Described Prestressed T RC thin plate is made up of high performance composite mortar 3, alkali proof fiber net 4 and stainless reinforcing bar 5, is specifically obtained by following steps:
(1) be cut into by alkali proof fiber net 4 in length and breadth to the groined type shape respectively having 2 bands, the length L of band is consistent with the length being reinforced concrete slab 1, each strip width 350mm, and strip in length and breadth intersects at distance 1/5L place, end;
(2) stainless reinforcing bar 5 is worn in the centre position of each band;
(3) at the high performance composite mortar 3 of bottom template upper 5mm, the alkali proof fiber net 4 cut in step (1) is placed in composite mortar surface, and the end of alkali proof fiber net 4 is placed in stretching pedestal, pedestal stretches simultaneously alkali proof fiber net 4, keep extended state not loosen, control stress for prestressing is the TRC thin plate ultimate tensile strength of 0.3 times;
(4) pour into a mould 7mm high performance composite mortar 3 in a template, temperature be 20 DEG C, humidity be the condition of 95% under maintenance 28 days, loosen alkali proof fiber net 4 and obtain groined preload stress TRC thin plate, thickness is 12mm.
Wherein, described interface processing and construction of facing upward are realized by following steps:
(1) be reinforced concrete slab 1 surface cutter rough, expose concrete, formed groined type cut a hole rough band;
(2) and cut a hole the end opens bolt hole of rough band at every bar, bolt hole aperture is 10mm, and the degree of depth is 50mm, screws in stainless steel bolt 6, pours into interfacial agents 2 and treat that it solidifies in bolt hole;
(3) bolt hole identical with cutting a hole rough band is offered at the correspondence position of Prestressed T RC thin plate;
(4) brush away the rough band dust of cutter and loosening aggregate, scrape embedding for interfacial agents 2 in the rough band of cutter, smear and fill and lead up, thickness is 4mm, so far realizes interface process;
(5) contraposition of Prestressed T RC thin plate is labelled to being reinforced bottom concrete slab 1 after step (4) process, knocks Prestressed T RC thin plate and make interfacial agents 2 fill space, scrape off unnecessary interfacial agents 2;
(6) stainless steel bolt 6 is spun nut, arrange that carpenters' clamp carries out anchoring, remove carpenters' clamp after maintenance and can complete work progress of facing upward.
embodiment 2
A method for precast prestressed TRC plate reinforced steel concrete plate, comprises and makes Prestressed T RC thin plate, interface processing, construction of facing upward; Described Prestressed T RC thin plate is made up of high performance composite mortar 3, alkali proof fiber net 4 and stainless reinforcing bar 5, is specifically obtained by following steps:
(1) be cut into by alkali proof fiber net 4 in length and breadth to the groined type shape respectively having 2 bands, the length L of band is consistent with the length being reinforced concrete slab 1, each strip width 400mm, and strip in length and breadth intersects at distance 1/4L place, end;
(2) stainless reinforcing bar 5 is worn in the centre position of each band;
(3) at the high performance composite mortar 3 of bottom template upper 6mm, the alkali proof fiber net 4 cut in step (1) is placed in composite mortar surface, and the end of alkali proof fiber net 4 is placed in stretching pedestal, pedestal stretches simultaneously alkali proof fiber net 4, keep extended state not loosen, control stress for prestressing is the TRC thin plate ultimate tensile strength of 0.4 times;
(4) pour into a mould 8mm high performance composite mortar 3 in a template, temperature be 21 DEG C, humidity be the condition of 100% under maintenance 28 days, loosen alkali proof fiber net 4 and obtain groined preload stress TRC thin plate, thickness is 15mm.
Wherein, described interface processing and construction of facing upward are realized by following steps:
(1) be reinforced concrete slab 1 surface cutter rough, expose concrete, formed groined type cut a hole rough band;
(2) and cut a hole the end opens bolt hole of rough band at every bar, bolt hole aperture is 10mm, and the degree of depth is 50mm, screws in stainless steel bolt 6, pours into interfacial agents 2 and treat that it solidifies in bolt hole;
(3) bolt hole identical with cutting a hole rough band is offered at the correspondence position of Prestressed T RC thin plate;
(4) brush away the rough band dust of cutter and loosening aggregate, scrape embedding for interfacial agents 2 in the rough band of cutter, smear and fill and lead up, thickness is 6mm, so far realizes interface process;
(5) contraposition of Prestressed T RC thin plate is labelled to being reinforced bottom concrete slab 1 after step (4) process, knocks Prestressed T RC thin plate and make interfacial agents 2 fill space, scrape off unnecessary interfacial agents 2;
(6) stainless steel bolt 6 is spun nut, arrange that carpenters' clamp carries out anchoring, remove carpenters' clamp after maintenance and can complete work progress of facing upward.
embodiment 3
A method for precast prestressed TRC plate reinforced steel concrete plate, comprises and makes Prestressed T RC thin plate, interface processing, construction of facing upward; Described Prestressed T RC thin plate is made up of high performance composite mortar 3, alkali proof fiber net 4 and stainless reinforcing bar 5, is specifically obtained by following steps:
(1) be cut into by alkali proof fiber net 4 in length and breadth to the groined type shape respectively having 2 bands, the length L of band is consistent with the length being reinforced concrete slab 1, each strip width 450mm, and strip in length and breadth intersects at distance 1/4L place, end;
(2) stainless reinforcing bar 5 is worn in the centre position of each band;
(3) at the high performance composite mortar 3 of bottom template upper 7mm, the alkali proof fiber net 4 cut in step (1) is placed in composite mortar surface, and the end of alkali proof fiber net 4 is placed in stretching pedestal, pedestal stretches simultaneously alkali proof fiber net 4, keep extended state not loosen, control stress for prestressing is the TRC thin plate ultimate tensile strength of 0.5 times;
(4) pour into a mould 9mm high performance composite mortar 3 in a template, temperature be 22 DEG C, humidity be the condition of 98% under maintenance 28 days, loosen alkali proof fiber net 4 and obtain groined preload stress TRC thin plate, thickness is 16mm.
Wherein, described interface processing and construction of facing upward are realized by following steps:
(1) be reinforced concrete slab 1 surface cutter rough, expose concrete, formed groined type cut a hole rough band;
(2) and cut a hole the end opens bolt hole of rough band at every bar, bolt hole aperture is 10mm, and the degree of depth is 50mm, screws in stainless steel bolt 6, pours into interfacial agents 2 and treat that it solidifies in bolt hole;
(3) bolt hole identical with cutting a hole rough band is offered at the correspondence position of Prestressed T RC thin plate;
(4) brush away the rough band dust of cutter and loosening aggregate, scrape embedding for interfacial agents 2 in the rough band of cutter, smear and fill and lead up, thickness is 8mm, so far realizes interface process;
(5) contraposition of Prestressed T RC thin plate is labelled to being reinforced bottom concrete slab 1 after step (4) process, knocks Prestressed T RC thin plate and make interfacial agents 2 fill space, scrape off unnecessary interfacial agents 2;
(6) stainless steel bolt 6 is spun nut, arrange that carpenters' clamp carries out anchoring, remove carpenters' clamp after maintenance and can complete work progress of facing upward.
comparative example 1
Be to adopt non-prestressed TRC web braces armored concrete slab with the difference of embodiment 3.
The scheme concrete panels result adopting embodiment and comparative example to provide is: the cracking load improving ruggedized construction, and then improves the durability of structure; Adopt non-prestressed TRC web braces, during structural deterioration, the tensile strength of TRC material plays and is no more than 20%.Adopt the non-prestressed TRC web braces plate of woven net, its cracking load and ultimate load improve 35.2% and 26.5%, and the control stress for prestressing applied is when being 0.3 ~ 0.5 times of ultimate tensile strength, adopt the gusset plate of the Prestressed T RC thin plate of same amount fabric web, its cracking load rises to 97.5% ~ 110.2%, and ultimate load rises to 77.4% ~ 95.8%.When control stress for prestressing is for being greater than 0.5 times of ultimate tensile strength or being less than 0.3 times of ultimate tensile strength, consolidation effect is not good.
Adopt embodiment 1 ~ 3 as shown in the table with the effect of the reinforced steel concrete plate of comparative example 1:
| Embodiment 1 | Embodiment 2 | Embodiment 3 | Comparative example 1 | |
| Tensile strength plays | 67.3% | 73.5% | 86.8% | 20% |
| Cracking load improves index | 97.5% | 101.7% | 110.2% | 35.2% |
| Ultimate load improves index | 77.4% | 85.6% | 95.8% | 26.5% |
Claims (7)
1. a method for precast prestressed TRC plate reinforced steel concrete plate, is characterized in that, comprises and makes Prestressed T RC thin plate, interface processing, construction of facing upward; Described Prestressed T RC thin plate is made up of high performance composite mortar (3), alkali proof fiber net (4) and stainless reinforcing bar (5), is specifically obtained by following steps:
(1) alkali proof fiber net (4) is cut in length and breadth to the groined type shape respectively having 2 bands, the length L of band is consistent with the length being reinforced concrete slab (1), each strip width is 350mm ~ 450mm, and band is in length and breadth to intersecting apart from 1/5L ~ 1/4L place, its end;
(2) stainless reinforcing bar (5) is worn in the centre position of each band;
(3) at the high performance composite mortar (3) of bottom template upper 5mm ~ 7mm, the alkali proof fiber net (4) cut in step (1) is placed in high performance composite mortar (3) surface, and the end of alkali proof fiber net (4) is placed in stretching pedestal, pedestal stretches alkali proof fiber net (4), keep extended state not loosen, control stress for prestressing is the TRC thin plate ultimate tensile strength of 0.3 ~ 0.5 times;
(4) template in step (3) continues cast 7mm ~ 9mm high performance composite mortar (3), temperature be 20 DEG C ± 2 DEG C, humidity to be at least under the condition of 95% maintenance 28 days, loosens obtained " well " font Prestressed T RC thin plate of alkali proof fiber net (4).
2. the method for a kind of precast prestressed TRC plate reinforced steel concrete plate according to claim 1, is characterized in that, described interface processing and construction of facing upward are realized by following steps:
(1) be reinforced concrete slab (1) surface cutter rough, expose concrete, formed " well " font cut a hole rough band;
(2) cut a hole the end opens bolt hole of rough band at every bar, screw in stainless steel bolt (6), in bolt hole gap, pour into interfacial agents (2) and treat that it solidifies;
(3) offer at the correspondence position of Prestressed T RC thin plate and roughly bring corresponding bolt hole with cutting a hole;
(4) brush away the rough dust brought of cutter and loosening aggregate, scrape embedding for interfacial agents (2) in the rough band of cutter, smear and fill and lead up, thickness is 4mm ~ 8mm, so far completes interface process;
(5) contraposition of Prestressed T RC thin plate is labelled to being reinforced bottom concrete slab (1) after step (4) process, knocks Prestressed T RC thin plate and make interfacial agents (2) fill space, scrape off unnecessary interfacial agents (2);
(6) be stainless steel bolt (6) tightening nuts, arrange that carpenters' clamp carries out anchoring, remove carpenters' clamp after maintenance and can complete work progress of facing upward.
3. the method for a kind of precast prestressed TRC plate reinforced steel concrete plate according to claim 1, is characterized in that, described alkali proof fiber net (4) is carbon fiber, aramid fiber, basalt fibre or alkali-resistant glass fibre.
4. the method for a kind of precast prestressed TRC plate reinforced steel concrete plate according to claim 1, is characterized in that, stretch in length and breadth to alkali proof fiber net (4) in step (3) on pedestal simultaneously.
5. the method for a kind of precast prestressed TRC plate reinforced steel concrete plate according to claim 1, it is characterized in that, in step (4) temperature be 22 DEG C, humidity be the condition of 98% under maintenance 28 days, loosen " well " font Prestressed T RC thin plate that the obtained thickness of alkali proof fiber net (4) is 12mm ~ 16mm.
6. the method for a kind of precast prestressed TRC plate reinforced steel concrete plate according to claim 2, it is characterized in that, described bolt hole aperture is 10mm, and the degree of depth is 50mm.
7. the method for a kind of precast prestressed TRC plate reinforced steel concrete plate according to claim 2, it is characterized in that, described interfacial agents (2) is potassium magnesium phosphate cement.
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| CN109112977B (en) * | 2018-09-04 | 2024-01-16 | 南京林业大学 | Rapid prestress reinforced bridge body structure and method |
| CN115341707A (en) * | 2022-08-16 | 2022-11-15 | 北京市建筑设计研究院有限公司 | Prestressed carbon fiber fabric reinforced concrete sheet based on health monitoring |
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