CN114673259A - Structure for improving ductility of assembled combined structure and construction method - Google Patents
Structure for improving ductility of assembled combined structure and construction method Download PDFInfo
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- CN114673259A CN114673259A CN202210336044.6A CN202210336044A CN114673259A CN 114673259 A CN114673259 A CN 114673259A CN 202210336044 A CN202210336044 A CN 202210336044A CN 114673259 A CN114673259 A CN 114673259A
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- 238000010276 construction Methods 0.000 title claims abstract description 28
- 229920002430 Fibre-reinforced plastic Polymers 0.000 claims abstract description 56
- 239000011151 fibre-reinforced plastic Substances 0.000 claims abstract description 56
- 239000002131 composite material Substances 0.000 claims abstract description 38
- 239000011150 reinforced concrete Substances 0.000 claims abstract description 29
- 239000011374 ultra-high-performance concrete Substances 0.000 claims abstract description 24
- 230000007547 defect Effects 0.000 claims abstract description 19
- 239000000853 adhesive Substances 0.000 claims abstract description 15
- 230000001070 adhesive effect Effects 0.000 claims abstract description 15
- 239000000126 substance Substances 0.000 claims abstract description 15
- 238000007906 compression Methods 0.000 claims abstract description 3
- 239000000463 material Substances 0.000 claims description 13
- 238000004140 cleaning Methods 0.000 claims description 7
- 229910000831 Steel Inorganic materials 0.000 claims description 4
- 238000005498 polishing Methods 0.000 claims description 4
- 238000004080 punching Methods 0.000 claims description 4
- 239000010959 steel Substances 0.000 claims description 4
- 239000004793 Polystyrene Substances 0.000 claims description 3
- 230000001680 brushing effect Effects 0.000 claims description 3
- 239000003822 epoxy resin Substances 0.000 claims description 3
- 239000000835 fiber Substances 0.000 claims description 3
- 230000000149 penetrating effect Effects 0.000 claims description 3
- 229920000647 polyepoxide Polymers 0.000 claims description 3
- 229920002223 polystyrene Polymers 0.000 claims description 3
- 230000003014 reinforcing effect Effects 0.000 claims description 3
- 230000006835 compression Effects 0.000 claims description 2
- 230000002209 hydrophobic effect Effects 0.000 claims description 2
- 229910000746 Structural steel Inorganic materials 0.000 claims 1
- 238000009412 basement excavation Methods 0.000 claims 1
- 239000004567 concrete Substances 0.000 description 24
- 230000002950 deficient Effects 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 239000002184 metal Substances 0.000 description 4
- 230000009471 action Effects 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 230000007797 corrosion Effects 0.000 description 2
- 238000005260 corrosion Methods 0.000 description 2
- 239000011210 fiber-reinforced concrete Substances 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 230000002035 prolonged effect Effects 0.000 description 2
- 230000003139 buffering effect Effects 0.000 description 1
- 238000009435 building construction Methods 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000003733 fiber-reinforced composite Substances 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000011178 precast concrete Substances 0.000 description 1
- 238000009417 prefabrication Methods 0.000 description 1
- 238000010008 shearing Methods 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
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Classifications
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04B—GENERAL BUILDING CONSTRUCTIONS; WALLS, e.g. PARTITIONS; ROOFS; FLOORS; CEILINGS; INSULATION OR OTHER PROTECTION OF BUILDINGS
- E04B1/00—Constructions in general; Structures which are not restricted either to walls, e.g. partitions, or floors or ceilings or roofs
- E04B1/343—Structures characterised by movable, separable, or collapsible parts, e.g. for transport
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04B—GENERAL BUILDING CONSTRUCTIONS; WALLS, e.g. PARTITIONS; ROOFS; FLOORS; CEILINGS; INSULATION OR OTHER PROTECTION OF BUILDINGS
- E04B1/00—Constructions in general; Structures which are not restricted either to walls, e.g. partitions, or floors or ceilings or roofs
- E04B1/38—Connections for building structures in general
- E04B1/383—Connection of concrete parts using adhesive materials, e.g. mortar or glue
-
- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04B—GENERAL BUILDING CONSTRUCTIONS; WALLS, e.g. PARTITIONS; ROOFS; FLOORS; CEILINGS; INSULATION OR OTHER PROTECTION OF BUILDINGS
- E04B1/00—Constructions in general; Structures which are not restricted either to walls, e.g. partitions, or floors or ceilings or roofs
- E04B1/38—Connections for building structures in general
- E04B1/388—Separate connecting elements
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- Engineering & Computer Science (AREA)
- Architecture (AREA)
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Working Measures On Existing Buildindgs (AREA)
Abstract
The invention belongs to the field of structural engineering, and particularly relates to a structure for improving ductility of an assembled combined structure and a construction method. The composite slab is composed of a prefabricated defect block (1), a partially hollowed reinforced concrete slab (2), a shear connector (3), an FRP (fiber reinforced plastic) section bar (4), a post-cast UHPC (5) and a chemical adhesive (6). The prefabricated defect block (1) is arranged in the partially hollowed reinforced concrete slab (2) and is connected with the FRP profile (4) through a shear connector (3) and a chemical adhesive (6). According to the invention, by utilizing the prefabricated defect block (1) and the post-cast UHPC (5), the connection of the assembled structure in the compression process is tighter and the ductility is obviously enhanced while the bearing capacity and the integral rigidity of the structure are improved. The partially hollowed reinforced concrete slab (2) can be used as a template for post-pouring UHPC (5), so that the cost is saved, the construction difficulty is reduced, and the technical performance and the operability are strong.
Description
Technical Field
The invention belongs to the technical field of structural engineering, and particularly relates to a structure for improving ductility of an assembled combined structure and a construction method.
Background
(1) The existing combined structure has a brittle failure mode
At present, the traditional building structure is basically shaped, and the breakthrough of the structural performance depends on the application of new materials. The Fiber Reinforced Polymer (FRP) composite material has the advantages of high specific strength, high specific modulus, high durability and the like, is widely applied to reinforced concrete structures, and develops rapidly in FRP profile-concrete composite structures. The FRP profile-concrete combined beam/plate is a reasonable structural form of combination of FRP and concrete, fully exerts high compressive strength of the concrete and good tensile capacity of FRP materials, and realizes the effect of '1 +1 > 2'. However, the failure modes of the FRP-concrete composite beam/slab structure under the load action are peeling brittle failures starting from the interface, and the FRP-concrete composite beam/slab cannot generate ductility early warning when the FRP-concrete composite beam/slab is damaged like the traditional steel-concrete composite structure.
(2) Shear connector is susceptible to corrosion
The connection mode between the composite structures is the key for fully playing the performance of the FRP-concrete composite structure. In the shear connector of the FRP-concrete composite structure, although the common metal stud has the advantages of certain ductility, high bearing capacity, convenient construction and the like, the metal bolt is easy to corrode in the long-term use process, and especially the metal bolt is seriously corroded under the action of fatigue load and severe environment. When the bolt is rusted, the connection performance of the FRP and the concrete can be influenced, so that the stress performance of the FRP-concrete combined beam/plate structure is greatly reduced, and the concrete can be damaged after the metal bolt is rusted, so that the performance of the concrete is changed.
(3) The cast-in-place common concrete has long construction period and poor durability
In the last decade, the attention of the assembly type structure in the building industry in China is higher and higher due to the advantages of short construction period, high product quality, low construction cost, no restriction on construction seasons, safety, environmental protection and the like. However, most building structures in China adopt a mode of cast-in-place of common concrete, and the common concrete has the advantages of low price, simple production process and the like. However, cast-in-place ordinary concrete also has the disadvantages that the cast-in-place ordinary concrete is difficult to overcome, such as great self-weight, poor durability, various construction procedures, maintenance of the cast-in-place concrete, long construction period, large amount of templates and the like. For the above disadvantages, Ultra-high performance concrete (UHPC for short) is increasingly applied to engineering due to its high strength, good durability, small self weight, good economy and the like.
Disclosure of Invention
In view of the above problems, the present invention relates to a structure for improving ductility of a fabricated composite structure. The composite material consists of prefabricated defective blocks, partially hollowed reinforced concrete slabs, shear connectors, FRP (fiber reinforced plastic) profiles, post-cast UHPC (ultra high Performance concrete) and chemical adhesives. The prefabricated defect blocks are arranged in the partially hollowed reinforced concrete slab and connected with the FRP profile through shear connectors and chemical adhesives. The prefabricated defect block and the UHPC are combined to obviously improve the bearing capacity and the integral rigidity of the structure, and the ultra-high ductility storage is provided, so that the ultra-high ductility composite material has excellent performance in a compression area.
In order to achieve the purpose, the invention adopts the following technical scheme: a structure for improving the ductility of an assembled composite structure comprises a prefabricated defect block, a partially hollowed reinforced concrete slab, a shear connector, an FRP (fiber reinforced plastic) section, a post-cast UHPC (ultra high Performance concrete) and a chemical adhesive.
The structure for improving the ductility of the assembled combined structure is characterized in that the prefabricated defect block is made of one of hydrophobic materials such as polystyrene and has a certain ductility, and the cross section of the prefabricated defect block can be in an arch shape, a square shape, a triangular shape, an oval shape or a saddle shape, so that the stress buffering effect is realized.
A improve ductile structure of assembled integrated configuration, the reinforced concrete slab that partially hollows out, the shape of hollowing out is the rectangle, and the position of hollowing out is for receiving pressure district one side, and the inside structure reinforcing bar that lays, structure itself can be prefabricated in the mill, adds the structure reinforcing bar and makes concrete slab itself have certain bearing capacity.
According to the structure for improving the ductility of the fabricated composite structure, the shear connecting pieces are cluster type shear nails and are arranged in the partially hollowed reinforced concrete slab, so that the problems that the cluster nails are large in arrangement quantity and difficult in construction and positioning are avoided.
According to the structure for improving the ductility of the fabricated composite structure, the shear connecting piece connecting holes are reserved in the partially hollowed reinforced concrete slab hollowed positions of the FRP sectional materials, so that arrangement and positioning of shear nails are facilitated, and the section is in one of an I-shaped shape, a rectangular shape and a box shape.
According to the structure for improving the ductility of the fabricated composite structure, 2% of steel fiber is adopted for post-pouring UHPC, the strength improvement effect is good, the bridging effect among the steel fibers can be increased, and the holes of the partially hollowed reinforced concrete slabs are filled.
According to the structure for improving the ductility of the assembled composite structure, the prefabricated defect block is arranged in the partially hollowed reinforced concrete slab and is connected with the FRP profile through the shear connector and the chemical adhesive, so that the composite structure is integrated, and the stress performance is perfect.
The invention also provides a construction method for improving the ductility of the prefabricated combined structure, which comprises the following steps:
step a, placing and fixing FRP (fiber reinforced Plastic) sections at corresponding positions of a structure according to design requirements;
b, polishing the surface of the FRP profile to be rough according to the design requirement, punching, cleaning holes and cleaning the surface of the FRP profile after scribing and positioning;
c, brushing a layer of chemical adhesive on the surface of the FRP section according to the design requirement, and installing a partially hollowed reinforced concrete slab on the FRP section;
d, penetrating the shear connector into a reserved hole of the FRP section according to the design requirement, and smearing a layer of epoxy resin in a gap between the FRP shear connector and the reserved hole of the FRP section;
and e, placing the prefabricated defect blocks into the partially hollowed reinforced concrete slab according to design requirements, and finally, post-pouring UHPC in the hollowed holes and maintaining under standard conditions.
The structure for improving the ductility of the assembled combined structure provided by the invention fully utilizes the characteristics of various materials, fully exerts the stress performance of the combined structure, inherits the excellent stress performance of the combined structure and overcomes the characteristic of brittle failure of the combined structure; the construction method of the structure for improving the ductility of the assembled combined structure, provided by the invention, is convenient and rapid, saves time and labor, can effectively improve the utilization rate of materials, saves cost, enables the construction process of the combined structure to be simpler and more convenient, prolongs the service life of the combined structure, and is particularly represented as follows:
(1) by adopting the partially assembled concrete slab, the construction period can be shortened, the construction efficiency is improved, the construction is safe and environment-friendly, and the requirements of national green and rapid building construction are met;
(2) by adopting local post-pouring UHPC, the connection integrity of FRP and concrete is improved, meanwhile, the durability of a combined structure interface can be greatly increased, and the corrosion rate of the steel bar is reduced. In addition, compared with the adoption of full UHPC, the local post-pouring UHPC has good economy;
(3) the UHPC with the initial defect of prefabrication is designed, so that the component has ductility, the FRP-concrete combined beam/plate structure is prevented from brittle failure, the anti-seismic performance is improved, and the safety early warning is realized.
Additional advantages and features of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention; the objectives and other advantages of the invention will be realized and attained by the structure particularly pointed out in the written description and claims hereof as well as the appended drawings.
Description of the drawings:
in order to more clearly illustrate the embodiments or technical solutions in the prior art of the present invention, the drawings used in the description of the embodiments or prior art will be briefly described below, and it is obvious that the drawings in the following description are some examples of the present invention, and those skilled in the art can also obtain other drawings according to the drawings without creative efforts.
FIG. 1 is a schematic view of a construction for improving ductility of a fabricated composite structure according to the present invention;
FIG. 2 is a cross-sectional view A-A of FIG. 2 in accordance with the present invention;
FIG. 3 is an exploded view of a fabricated composite structure of the present invention to improve ductility
FIG. 4 is a stress-strain comparison of the composite structure of the present invention with a prior art structure
FIG. 5 is a load-deflection comparison graph of the composite structure of the present invention and a prior art structure
In the accompanying drawings 1 to 3: 1 is a prefabricated defect block; 2, a reinforced concrete slab which is partially hollowed; 3 is a shear connector; 4 is FRP section bar; 5 post-pouring UHPC; and 6 is a chemical adhesive.
The specific implementation mode is as follows:
in order to clearly understand the technical features, purposes and effects of the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described with reference to the accompanying drawings, and it is obvious that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The structure for improving the ductility of the assembled combined structure provided by the invention fully utilizes the stress characteristics of various materials, fully exerts the stress performance of the combined structure, inherits the excellent stress performance of the combined structure, overcomes the characteristic of brittle failure of the combined structure and realizes the ductility early warning of the combined structure.
Fig. 1 is a schematic view showing a structure for improving ductility of a fabricated composite structure according to the present invention, in which fig. 1, a partially excavated reinforced concrete slab 2 is fixed to FRP sections 4 using shear connectors 3 so as to be combined into a complete composite structure.
For example, before the partially hollowed reinforced concrete slab 2 and the FRP section 4 are combined, the upper surface of the FRP section 4 should be roughened by grinding, positioning and punching, and cleaning the surface, and a layer of chemical adhesive 6 is further applied on the surface of the FRP section 4, it is noted that the material of the FRP section 4 in this embodiment is a fiber reinforced composite material, the cross-sectional shape is one of an i-shape, a rectangle, and a box shape, and the cross-sectional form of the tension member in practical application is not limited to this form, and different cross-sectional forms of the tension member are within the protection scope of the present invention.
The construction system provided by the invention adopts a mode of polishing the surface of the tension member and coating a chemical adhesive, and the combined mode increases the friction force between the precast concrete plate and the tension member and improves the shearing resistance of the combined structure.
Illustratively, the shear connector 3 provided by the invention adopts a cluster type shear nail, is arranged in the partially hollowed reinforced concrete slab 2, and a layer of chemical adhesive is coated in a gap between the shear connector 3 and the reserved hole of the FRP profile 4.
The structural system provided by the invention adopts the FRP shear key connection mode, so that the shear resistance of the shear connector is improved, the durability of the structure can be obviously improved, and the service life of the combined structure is prolonged.
Fig. 3 shows an exploded view of a structure for improving ductility of an assembled composite structure according to the present invention, and shows a construction sequence from top to bottom.
Illustratively, the prefabricated defective block 1 mentioned in the present embodiment should be placed in a reinforced concrete slab 2, and then the UHPC 5 is locally post-poured, it should be noted that in practical applications, the material of the prefabricated defective block 1 is not limited to polystyrene, the cross-sectional shape of the prefabricated defective block 1 is not limited to arch, and may be one of square, triangle, ellipse and saddle, and different materials and cross-sectional shapes are within the protection scope of the present invention.
The construction system provided by the invention adopts a combination mode of prefabricating initial defects, and can obviously improve the ductility deformation of the combined structure under the condition of ensuring the stress performance of the combined structure, so that the ductility early warning of the combined structure is realized to realize a stress-strain curve shown in fig. 4. As is apparent from fig. 4, the present invention has a plurality of steps, which means that the present invention has a ductile early warning, and the safety of the composite structure is greatly improved.
The combined structure provided by the invention can realize the load-deflection curve shown in fig. 5, and as is known from the figure, for the FRP-UHPC combined beam structure, the UHPC composite beam structure cannot be crushed under the load action due to overhigh strength, and the damage form of the structure is that the FRP is sheared; for the FRP-common concrete composite beam, the concrete is crushed due to too low strength, and the whole structure has no ductility; for the invention, the existence of the preset defect causes larger deflection in the beam span, and the safety of the structure is ensured.
In order to ensure the stability and firmness of the construction system in the embodiment of the invention, the service life and the construction convenience of the combined structure are prolonged, and the construction cost is saved; the invention provides a construction method of a structure for improving the ductility of a fabricated composite structure, which comprises the following steps:
step a, placing and fixing the FRP section 4 at a corresponding position of a structure according to design requirements;
b, polishing the surface of the FRP section 4 to be rough according to design requirements, punching, cleaning holes and cleaning the surface of the FRP section 4 after scribing and positioning;
c, brushing a layer of chemical adhesive 9 on the surface of the FRP section 4 according to the design requirement, and installing the partially hollowed reinforced concrete slab 2 on the FRP section 4;
d, penetrating the shear connector 3 into a reserved hole of the FRP profile 4 according to the design requirement, and smearing a layer of epoxy resin in a gap between the FRP shear connector and the reserved hole of the FRP profile 3;
and e, placing the prefabricated defect block 1 into the partially hollowed reinforced concrete slab 6 according to design requirements, and finally post-pouring UHPC 5 into the hollowed hole and maintaining under standard conditions.
Although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: it is to be understood that modifications may be made to the above-described arrangements in the embodiments or equivalents may be substituted for some of the features of the embodiments without departing from the spirit or scope of the present invention.
Claims (8)
1. The structure for improving the ductility of the assembled composite structure is characterized by consisting of a prefabricated defect block (1), a partially hollowed reinforced concrete slab (2), a shear connector (3), an FRP (fiber reinforced plastic) section bar (4), a post-cast UHPC (5) and a chemical adhesive (6).
2. The structure for improving ductility of assembled composite structures as claimed in claim 1, wherein the material of the prefabricated defect block (1) is one of hydrophobic materials such as polystyrene, and the cross-sectional shape can be one of arch, square, triangle, ellipse and saddle.
3. The structure for improving ductility of assembled composite structures as claimed in claim 1, wherein the partially excavated reinforced concrete slab (2) has a rectangular shape, and the excavation position is a side of the compression zone, and the structural steel and the reinforcing bars are arranged inside.
4. A structure for improving ductility of fabricated composite structure according to claim 1, characterized in that the shear connectors (3) are cluster type shear nails arranged in partially hollowed reinforced concrete slab (2).
5. The structure for improving ductility of fabricated composite structures as claimed in claim 1, wherein the FRP section (4) is prepared with a shear connector (3) connecting hole in the partially hollowed reinforced concrete slab (2) hollow position, and the cross-sectional shape is one of i-shape, rectangle and box shape.
6. The structure for improving ductility of fabricated composite structures according to claim 1, wherein the post-cast UHPC (5) is used with a steel fiber content of 2% and fills the holes of partially excavated reinforced concrete slabs (2).
7. The structure for improving ductility of fabricated composite structure according to claim 1, wherein the prefabricated defect block (1) is placed in the partially excavated reinforced concrete slab (2) and connected with the FRP section (4) by the shear connector (3) and the chemical adhesive (6).
8. A construction method for a structure for improving ductility of a fabricated composite structure, comprising the steps of:
step a, placing and fixing the FRP section (4) at a corresponding position of a structure according to design requirements;
b, polishing the surface of the FRP section (4) to be rough according to design requirements, and punching, cleaning holes and cleaning the surface of the FRP section (4) after scribing and positioning;
c, brushing a layer of chemical adhesive (6) on the surface of the FRP section (4) according to the design requirement, and installing a partially hollowed reinforced concrete slab (2) on the FRP section (4);
d, penetrating the shear connector (3) into a reserved hole of the FRP section (4) according to the design requirement, and smearing a layer of epoxy resin in a gap between the FRP shear connector (3) and the reserved hole of the FRP section (4);
and e, placing the prefabricated defect block (1) in the partially hollowed reinforced concrete slab (2) according to design requirements, and finally post-pouring UHPC (5) in the hollowed hole and maintaining under standard conditions.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202210336044.6A CN114673259A (en) | 2022-03-31 | 2022-03-31 | Structure for improving ductility of assembled combined structure and construction method |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202210336044.6A CN114673259A (en) | 2022-03-31 | 2022-03-31 | Structure for improving ductility of assembled combined structure and construction method |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116145531A (en) * | 2023-03-07 | 2023-05-23 | 暨南大学 | Assembled FRP-UHPC combined structure connected in clustered mode and construction method |
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| CN116145531B (en) * | 2023-03-07 | 2024-03-22 | 暨南大学 | Assembled FRP-UHPC combined structure connected in clustered mode and construction method |
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