CN115492416A - FRP-SMA composite sheet and reinforcing method thereof - Google Patents
FRP-SMA composite sheet and reinforcing method thereof Download PDFInfo
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- CN115492416A CN115492416A CN202211194723.0A CN202211194723A CN115492416A CN 115492416 A CN115492416 A CN 115492416A CN 202211194723 A CN202211194723 A CN 202211194723A CN 115492416 A CN115492416 A CN 115492416A
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- frp
- memory alloy
- sma
- epoxy resin
- composite
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- 239000002131 composite material Substances 0.000 title claims abstract description 69
- 238000000034 method Methods 0.000 title claims abstract description 16
- 230000003014 reinforcing effect Effects 0.000 title claims abstract description 15
- 239000000463 material Substances 0.000 claims abstract description 59
- 229910001285 shape-memory alloy Inorganic materials 0.000 claims abstract description 59
- 230000004913 activation Effects 0.000 claims abstract description 15
- 239000004677 Nylon Substances 0.000 claims abstract description 8
- 229920001778 nylon Polymers 0.000 claims abstract description 8
- 239000002023 wood Substances 0.000 claims description 35
- 239000003822 epoxy resin Substances 0.000 claims description 33
- 229920000647 polyepoxide Polymers 0.000 claims description 33
- 239000004744 fabric Substances 0.000 claims description 24
- 239000011248 coating agent Substances 0.000 claims description 15
- 238000000576 coating method Methods 0.000 claims description 15
- 230000000694 effects Effects 0.000 claims description 9
- 238000004804 winding Methods 0.000 claims description 9
- 238000004873 anchoring Methods 0.000 claims description 7
- 238000009826 distribution Methods 0.000 claims description 7
- 239000002390 adhesive tape Substances 0.000 claims description 6
- 238000004140 cleaning Methods 0.000 claims description 6
- 238000005336 cracking Methods 0.000 claims description 3
- 238000005728 strengthening Methods 0.000 claims description 3
- 239000003292 glue Substances 0.000 claims description 2
- 229920002430 Fibre-reinforced plastic Polymers 0.000 abstract description 10
- 239000011151 fibre-reinforced plastic Substances 0.000 abstract description 10
- 238000009434 installation Methods 0.000 abstract description 2
- 230000002787 reinforcement Effects 0.000 description 6
- 238000010276 construction Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 238000009435 building construction Methods 0.000 description 1
- 238000005266 casting Methods 0.000 description 1
- 238000013329 compounding Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 239000003733 fiber-reinforced composite Substances 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 230000003446 memory effect Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
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Classifications
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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
-
- 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
- E04G2023/0248—Increasing or restoring the load-bearing capacity of building construction elements of elements made of wood
-
- 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
- E04G2023/0251—Increasing or restoring the load-bearing capacity of building construction elements by using fiber reinforced plastic elements
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- Engineering & Computer Science (AREA)
- Architecture (AREA)
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- Mechanical Engineering (AREA)
- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Laminated Bodies (AREA)
Abstract
The invention relates to an FRP (fiber reinforced plastic) -SMA (shape memory alloy) composite sheet and a reinforcing method thereof, wherein the FRP composite sheet comprises at least two FRP sheets which are distributed at intervals side by side, a memory alloy wire is connected between the at least two FRP sheets, each FRP sheet is a material composite area, and the memory alloy wire positioned between two adjacent FRP sheets is a prestress activation area. The memory alloy wire is connected with the FRP sheet through a nylon wire. The invention has simple and reasonable structural design, convenient installation and simple prestress application to the member, greatly reduces the workload of technical personnel, reduces the working difficulty, improves the reinforcing capability and fully utilizes the material performance.
Description
The technical field is as follows:
the invention relates to an FRP-SMA composite sheet and a reinforcing method thereof.
Background art:
at present, FRP materials (fiber reinforced composite materials) are adopted for reinforcing a wood structure, although the mechanical property of the structure can be improved by the FPR materials, the defects still exist, for example, the performance of the FRP materials cannot be fully utilized, and sheets are easy to peel off when the FRP materials are pasted, so that the FRP materials need to be pre-tensioned, but the current application still stays in a stage of generating prestress by mechanical tensioning, the construction is too complex, once the FRP materials are shaped after being strengthened, the FRP materials cannot be stretched for the second time due to the fact that the FRP materials are pasted in the whole section, and the later-stage stress loss cannot be supplemented again. Shape Memory Alloys (SMA) have shape memory effect and superelasticity, and have some applications in building construction, indicating that they provide a restoring force, which corresponds to a pre-stress, and that the restoring force can be controlled by controlling the temperature. Therefore, the SMA and the FRP can be used together to form a novel composite material. The prestress strength in the composite material can be actively controlled, after the reinforcement is completed in the early-stage rational planning, the prestress relaxation condition can be improved in the later stage through temperature control, the secondary reinforcement effect is achieved, the anchoring and tensioning system is not needed in the reinforcement process, resources can be used more reasonably in the construction aspect, and the material use efficiency is optimized.
The invention content is as follows:
the invention aims to provide an FRP-SMA composite sheet material suitable for wood member reinforcement and a reinforcement method thereof, which have reasonable design, can greatly reduce the workload of technical personnel, reduce the working difficulty, improve the reinforcement capability and fully utilize the material performance.
In order to achieve the purpose, the invention adopts the technical scheme that: the FRP-SMA composite sheet comprises at least two FRP sheets which are distributed at intervals side by side, a memory alloy wire is connected between the at least two FRP sheets, each FRP sheet is a material composite area, and the memory alloy wire positioned between the two adjacent FRP sheets is a prestress activation area.
Further, the memory alloy wire is connected with the FRP sheet material through a nylon wire.
Furthermore, the memory alloy wire comprises a plurality of memory alloy wires which are distributed side by side at intervals, and the distribution direction of the plurality of memory alloy wires is vertical to the distribution direction of the at least two FRP sheets.
Furthermore, each FRP sheet is two layers, the material composite area is composed of two FRP sheets and a memory alloy wire, and the memory alloy wire and the two FRP sheets are alternately connected together by nylon threads in an alternating penetrating manner.
Furthermore, the distance between the plurality of memory alloy wires is 3mm-5mm; the length of the material composite area is 20mm-30mm, and the length of the prestress activation area is 5mm-15mm.
The invention adopts another technical scheme that: a method for reinforcing a wood beam by using an FRP-SMA composite sheet comprises the following steps:
step S1: processing the surface of the wood beam, removing rotten parts and embedding the rotten parts with materials, and cleaning the surfaces of other parts to enable the FRP cloth to be firmly bonded with wood;
step S2: supporting the position of a wood beam with large deflection, firstly restoring the deformation of the wood beam, firstly padding a layer of FRP cloth on the bottom of the beam, then coating a layer of epoxy resin on the upper part of the beam, then arranging memory alloy wires on the FRP cloth according to the interval of 3mm, sticking transparent adhesive tapes on two end parts of the memory alloy wires in order to keep the position of the memory alloy wires fixed during operation, finally covering a layer of FRP cloth on each end and the middle part of the memory alloy wires, directly sticking and fixing the FRP cloth and the beam bottom coated with epoxy resin adhesive to achieve the anchoring effect, and taking down the transparent adhesive tapes after the epoxy resin is dried;
and step S3: after the epoxy resin is dried, respectively and annularly winding a circle of FRP-SMA composite sheet at the two ends and the middle of the beam, enabling the material composite areas of the composite sheets to be connected end to end, and coating the epoxy resin on the material composite areas, so that the SMA-FRP composite sheets can be bonded with the beam more tightly, the peeling or the slippage is avoided, and the material property of the memory alloy wire is fully exerted;
and step S4: after the epoxy resin is dried, respectively electrifying the prestress activation regions of the annularly wound FRP-SMA composite sheet to generate pretightening force so as to achieve the effect of strengthening anchoring; and then electrifying the memory alloy wire material in the middle of the beam to generate pretightening force, so as to resist the tensile force of the beam bottom and repair the tiny cracks of the beam bottom.
The invention adopts another technical scheme that: a method for reinforcing a wood column by using an FRP-SMA composite sheet comprises the following steps:
step S1: processing the surface of the wooden pillar, removing rotten parts, then using materials for embedding, and cleaning the surface of other parts to enable the FRP cloth to be firmly bonded with the wood;
step S2: coating a circle of epoxy resin on the cracking part of the wood column, winding a circle of FRP cloth on the epoxy resin coated part, and then coating the FRP cloth with the epoxy resin;
and step S3: winding the cracked part of the wood column by using the FRP-SMA composite sheet for one to three circles to ensure that the material composite areas of the FRP-SMA composite sheet are connected end to end, and then coating the material composite areas with epoxy resin;
and step S4: and electrifying the prestress activation region of the FRP-SMA composite sheet after the epoxy resin is dried to generate pretightening force, so as to hoop the wood column and repair the damage.
Compared with the prior art, the invention has the following effects: the invention has simple and reasonable structural design, convenient installation and simple prestress application to the member, greatly reduces the workload of technical personnel, reduces the working difficulty, improves the reinforcing capability and fully utilizes the material performance.
Description of the drawings:
FIG. 1 is a schematic diagram of a top-down configuration of an embodiment of the present invention;
FIG. 2 is a schematic perspective view of an embodiment of the present invention;
FIG. 3 is an overall effect diagram of the reinforced wood beam and the reinforced wood column according to the embodiment of the invention;
FIG. 4 is a schematic view of the construction of a reinforced wood column in an embodiment of the present invention;
FIG. 5 is a side view schematic illustration of a reinforced timber beam according to an embodiment of the invention;
FIG. 6 is a schematic bottom view of a reinforced square timber beam according to an embodiment of the invention;
fig. 7 is a side view of a reinforced log beam in an embodiment of the invention.
In the figure:
1-FRP sheet; 2-memory alloy wire; 3-nylon thread; 101-a material composite zone; 201-pre-stressed active area.
The specific implementation mode is as follows:
the present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.
In the description of the present invention, it is to be understood that the terms "longitudinal", "lateral", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate orientations or positional relationships based on those shown in the drawings, and are used merely for convenience in describing the present invention, and do not indicate or imply that the device or element so referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, are not to be construed as limiting the present invention.
As shown in fig. 1-2, an FRP-SMA composite sheet according to the present invention includes at least two FRP sheets 1 and memory alloy wires 2 arranged side by side at intervals, the memory alloy wires 2 are connected between the at least two FRP sheets 1 through nylon threads 3, the composite sheet is divided into a material composite region 101 and a prestress activation region 201 according to the presence or absence of the FRP sheets 1, and the two regions are alternately arranged along the distribution direction of the FRP sheets, that is: each FRP sheet 1 is located in a material composite area 101, and the memory alloy wire 2 located between two adjacent FRP sheets 1 is located in a prestress activation area 2021.
In this embodiment, the FRP-SMA composite sheet includes, but is not limited to, reinforced wood beams and wood columns.
In this embodiment, the memory alloy wire 2 includes a plurality of memory alloy wires arranged side by side at intervals, and the distribution direction of the plurality of memory alloy wires is perpendicular to the distribution direction of the at least two FRP sheets 1.
In this embodiment, each FRP sheet is two layers, and the material composite region 101 is composed of two FRP sheets and a memory alloy wire; in the material compounding area, the memory alloy wire and the two FRP sheets are alternately connected together by nylon threads. The pre-stress activation region 201 is a memory alloy wire.
In this embodiment, the prestress active region prestress the member by heating the memory alloy wire 2.
In the embodiment, the distance between the plurality of memory alloy wires is 3mm-5mm; the length of the material composite area is 20mm-30mm, and the length of the prestress activation area is 5mm-15mm.
It should be noted that, in the present embodiment, the FRP sheet is a Fiber Reinforced Polymer/Plastic (FRP), and the SMA is a Shape Memory Alloy (SMA), which are well known in the art.
In this embodiment, when the FRP-SMA composite sheet is used to reinforce a wood beam, the concrete reinforcing method includes the following steps:
step S1: processing the surface of the wood beam, removing rotten parts and embedding the rotten parts with proper materials, and cleaning the surfaces of other parts to ensure that the FRP cloth can be firmly bonded with wood;
step S2: supporting the wooden beam at a position with large deflection, firstly recovering the deformation of the wooden beam, firstly padding a layer of FRP cloth at the bottom of the beam, then coating a layer of epoxy resin on the upper part of the beam, then arranging memory alloy wires on the FRP cloth according to the interval of 3mm, in order to keep the position of the memory alloy wires 2 fixed during operation, sticking transparent adhesive tapes on two end parts of the memory alloy wires, finally covering a layer of FRP cloth on two ends and the middle part of each memory alloy wire, directly sticking and fixing the FRP cloth and the beam bottom by coating epoxy resin glue to achieve the anchoring effect, and taking down the transparent adhesive tapes after the epoxy resin is dried;
and step S3: after the epoxy resin is dried, respectively and annularly winding a circle of FRP-SMA composite sheet at the two ends and in the middle of the beam, so that the material composite areas 101 of the composite sheet are connected end to end, the material composite areas 101 are fully coated with the epoxy resin, the SMA-FRP composite sheet can be bonded with the beam more tightly, the peeling or the slippage is avoided, and the material property of the memory alloy wire is fully exerted;
and step S4: after the epoxy resin is dried, respectively electrifying the prestress activation regions of the annularly wound FRP-SMA composite sheet to generate pretightening force so as to achieve the effect of strengthening anchoring; and then electrifying the memory alloy wire material in the middle of the beam to generate pretightening force, so as to resist the tensile force of the beam bottom and repair the tiny cracks of the beam bottom.
In this embodiment, when the FRP-SMA composite sheet is used to reinforce a wood column, the specific reinforcing method includes the following steps:
step S1: treating the surface of the wood column, removing rotten parts, then using a proper material for embedding, and cleaning the surface of other parts to enable the FRP cloth to be firmly bonded with wood;
step S2: coating a circle of epoxy resin on the cracking part of the wood column, winding a circle of FRP cloth on the epoxy resin coated part, and then coating the FRP cloth with the epoxy resin;
and step S3: winding the cracked part of the wood column by using the FRP-SMA composite sheet material for one to three circles according to the condition, connecting the material composite areas of the FRP-SMA composite sheet material end to end, and then coating the material composite areas with epoxy resin;
and step S4: and electrifying the prestress activation region of the FRP-SMA composite sheet after the epoxy resin is dried to generate pretightening force, so as to hoop the wood column and repair the damage.
If the invention discloses or relates to parts or structures which are fixedly connected to each other, the fixedly connected parts can be understood as follows, unless otherwise stated: a detachable fixed connection (for example using bolts or screws) is also understood as: non-detachable fixed connections (e.g. riveting, welding) can, of course, also be replaced by one-piece structures (e.g. manufactured in one piece using a casting process) (unless it is obvious that one-piece processes cannot be used).
In addition, terms used in any technical solutions disclosed in the present invention to indicate positional relationships or shapes include approximate, similar or approximate states or shapes unless otherwise stated.
Any part provided by the invention can be assembled by a plurality of independent components or can be manufactured by an integral forming process.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention and not to limit it; although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that: modifications to the specific embodiments of the invention or equivalent substitutions for parts of the technical features may be made; without departing from the spirit of the present invention, it is intended to cover all aspects of the invention as defined by the appended claims.
Claims (7)
1. An FRP-SMA composite sheet material, which is characterized in that: the composite material comprises at least two FRP sheets which are distributed side by side at intervals, memory alloy wires are connected between the at least two FRP sheets, each FRP sheet is a material composite area, and the memory alloy wires positioned between the two adjacent FRP sheets are prestress activation areas.
2. The FRP-SMA composite sheet material of claim 1, wherein: the memory alloy wire is connected with the FRP sheet through a nylon wire.
3. The FRP-SMA composite sheet material as claimed in claim 1 or 2, wherein: the memory alloy wire comprises a plurality of memory alloy wires which are distributed side by side at intervals, and the distribution direction of the plurality of memory alloy wires is vertical to the distribution direction of at least two FRP sheets.
4. The FRP-SMA composite sheet material of claim 3, wherein: each FRP sheet is two layers, the material composite area is composed of two FRP sheets and a memory alloy wire, and the memory alloy wire and the two FRP sheets are alternately connected together in an interpenetration mode through nylon threads.
5. The FRP-SMA composite sheet material of claim 3, wherein: the distance between the memory alloy wires is 3mm-5mm; the length of the material composite area is 20mm-30mm, and the length of the prestress activation area is 5mm-15mm.
6. A reinforcing method for reinforcing a wood beam using the FRP-SMA composite sheet as claimed in any one of claims 1 to 5, characterized in that: the method comprises the following steps:
step S1: processing the surface of the wood beam, removing rotten parts and embedding the rotten parts with materials, and cleaning the surfaces of other parts to enable the FRP cloth to be firmly bonded with wood;
step S2: supporting the wooden beam at a position with large deflection, firstly recovering the deformation of the wooden beam, firstly padding a layer of FRP cloth at the bottom of the beam, then coating a layer of epoxy resin on the upper part of the beam, then arranging memory alloy wires on the FRP cloth according to the interval of 3mm, in order to keep the position of the memory alloy wires fixed during operation, sticking transparent adhesive tapes on two end parts of the memory alloy wires, finally covering a layer of FRP cloth on two ends and the middle part of each memory alloy wire, directly sticking and fixing the FRP cloth and the beam bottom by coating epoxy resin glue to achieve the anchoring effect, and taking down the transparent adhesive tapes after the epoxy resin is dried;
and step S3: after the epoxy resin is dried, respectively and annularly winding a circle of FRP-SMA composite sheets at two ends and in the middle of the beam, so that the material composite areas of the composite sheets are connected end to end, the material composite areas are fully coated with the epoxy resin, the SMA-FRP composite sheets can be bonded with the beam more tightly, the peeling or the sliding is avoided, and the material property of the memory alloy wire is fully exerted;
and step S4: after the epoxy resin is dried, respectively electrifying the prestress activation regions of the annularly wound FRP-SMA composite sheet to generate pretightening force so as to achieve the effect of strengthening anchoring; and then electrifying the memory alloy wire material in the middle of the beam to generate pretightening force, so as to resist the tensile force of the beam bottom and repair the tiny cracks of the beam bottom.
7. A reinforcing method for reinforcing a wood column using the FRP-SMA composite sheet as claimed in any one of claims 1 to 5, characterized in that: the method comprises the following steps:
step S1: processing the surface of the wood column, removing rotten parts, then embedding the parts by using materials, and cleaning the surfaces of other parts to enable the FRP cloth to be firmly bonded with wood;
step S2: coating a circle of epoxy resin on the cracking part of the wood column, winding a circle of FRP cloth on the epoxy resin coated part, and then coating the FRP cloth with the epoxy resin;
and step S3: winding the cracked part of the wood column by using the FRP-SMA composite sheet for one to three circles to ensure that the material composite areas of the FRP-SMA composite sheet are connected end to end, and then coating the material composite areas with epoxy resin;
and step S4: and electrifying the prestress activation region of the FRP-SMA composite sheet after the epoxy resin is dried to generate pretightening force, so as to hoop the wood column and repair the damage.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211194723.0A CN115492416A (en) | 2022-09-29 | 2022-09-29 | FRP-SMA composite sheet and reinforcing method thereof |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202211194723.0A CN115492416A (en) | 2022-09-29 | 2022-09-29 | FRP-SMA composite sheet and reinforcing method thereof |
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| CN115492416A true CN115492416A (en) | 2022-12-20 |
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2022
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