CN111395794A - Method for reinforcing wood beam by embedded shape memory alloy stranded wire - Google Patents
Method for reinforcing wood beam by embedded shape memory alloy stranded wire Download PDFInfo
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- CN111395794A CN111395794A CN202010223073.2A CN202010223073A CN111395794A CN 111395794 A CN111395794 A CN 111395794A CN 202010223073 A CN202010223073 A CN 202010223073A CN 111395794 A CN111395794 A CN 111395794A
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- shape memory
- memory alloy
- alloy stranded
- stranded wire
- wood
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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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- 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
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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)
- Rod-Shaped Construction Members (AREA)
Abstract
The invention relates to a method for reinforcing a wood beam by an embedded shape memory alloy stranded wire in the field of civil engineering, which comprises the following steps: a grooving machine is used for forming beam grooves on the surfaces of the wood beam cross grains, and the beam grooves are arranged and extended along the full length of the wood beam; placing the shape memory alloy stranded wire into the beam groove, and completely fixing the shape memory alloy stranded wire in the beam groove by using the fixing assembly; and injecting structural adhesive into the beam groove, and then maintaining for a period of time to enable the shape memory alloy stranded wires to be tightly bonded with the wood beam. On the premise of enough quantity of the shape memory alloy stranded wires, the invention can improve the bending resistance bearing capacity and the deformation capacity of the wood beam to a certain extent. Meanwhile, the invention can reduce the influence of the traditional reinforcing method of sticking the carbon fiber cloth on the appearance of the beam. In addition, the invention can reduce the unrecoverable deformation of the wood beam under the action of a vertical earthquake to a certain extent, and improve the self-resetting performance of the wood beam, thereby reducing the maintenance cost and time of the wood structure after the earthquake.
Description
Technical Field
The invention relates to the field of civil engineering, in particular to a method for reinforcing new and existing wood structures, especially wood beams.
Background
Because of its high strength-to-weight ratio and low thermal conductivity, wood is widely used as a load-bearing member for new and existing structures. These components are subjected to combined action of loads and environmental factors during the service period, so that certain damage is generated. Therefore, a method of reinforcing a wood member is receiving attention.
The traditional method for reinforcing the wood beam focuses on improving the bending resistance bearing capacity and the ultimate deformation capacity of the member, and mainly comprises a method for reinforcing the member by adhering a steel plate and a method for reinforcing the member by adhering a composite material. Such reinforcement methods often ignore the enhancement of the recoverable performance of the wooden beams. Under the action of a strong vertical earthquake, the steel plate usually has remarkable unrecoverable deformation, and the fiber composite material even has brittle fracture failure. This significantly increases the post-earthquake repair costs and time of the wooden structure. Therefore, technical measures are necessary to improve the self-resetting performance of the wood beam.
Disclosure of Invention
The invention aims to provide a method for reinforcing a wood beam by embedding a shape memory alloy stranded wire, so as to improve the self-resetting performance of the wood beam.
The purpose of the invention is realized as follows: a method for reinforcing a wood beam by embedded shape memory alloy stranded wires at least comprises the following steps:
s1, forming beam grooves on the surfaces of the wood beam cross grains by using a grooving machine, wherein the beam grooves are arranged and extended along the full length of the wood beam;
s2, placing the shape memory alloy stranded wire into the beam groove, and fixing the shape memory alloy stranded wire in the beam groove by using a fixing assembly;
and S3, injecting structural adhesive into the beam groove to enable the shape memory alloy stranded wire to be bonded with the wood beam.
Further, the number and the diameter of the shape memory alloy stranded wires can be determined according to the load level, the tensile and compression strength of the wood beam along the grain direction and the yield strength of the shape memory alloy according to the most unfavorable stress balance of the section.
Further, the shape memory alloy stranded wires are arranged along the whole length of the wood beam.
Furthermore, the width and the height of the beam groove are two times of the diameter of the shape memory alloy stranded wire.
Furthermore, after grooving, residual wood chips in the beam groove are cleaned, and the cleanness of the beam groove is kept.
Further, the fixing assembly used in step S2 includes a pair of fixing devices, and the pair of fixing devices are respectively fixedly installed at two ends of the wood beam and embedded in the shape memory alloy stranded wire.
Further, the fixing assembly used in step S2 further includes a plurality of U-shaped metal members fixedly inserted into the inner wall of the beam groove, the U-shaped metal members are arranged along the length direction of the shape memory alloy stranded wire, and the U-shaped metal members hoop and fix the shape memory alloy stranded wire.
Further, in step S3, after the structural adhesive is injected into the beam groove, a curing process is performed to bond the shape memory alloy strands to the wood beam more tightly.
The invention has the beneficial effects that:
1. on the premise of enough quantity of the shape memory alloy stranded wires, the invention can improve the bending resistance bearing capacity and the deformation capacity of the wood beam to a certain extent;
2. meanwhile, the invention can reduce the influence of the traditional reinforcing method of sticking the carbon fiber cloth on the appearance of the beam;
3. in addition, the invention can reduce the unrecoverable deformation of the wood beam under the action of a vertical earthquake to a certain extent, and improve the self-resetting performance of the wood beam, thereby reducing the maintenance cost and time of the wood structure after the earthquake;
4. the structure is simple, the construction is convenient, the engineering popularization is convenient, and the application prospect is good.
Drawings
Fig. 1 is a general structural view of the present invention.
Fig. 2 is a schematic sectional structure view of a wood beam.
Fig. 3 is a schematic structural view of a U-shaped metal piece.
In the figure, 1 wood beam, 2 shape memory alloy stranded wires, 3U-shaped metal pieces, 4 fixing devices and 5 structural adhesive.
Detailed Description
The invention will be further described with reference to the accompanying figures 1-3 and specific examples.
As shown in fig. 1-3, a method for reinforcing a wood beam by embedding a shape memory alloy stranded wire therein, which comprises a wood beam 1, a shape memory alloy stranded wire 2, a grooving machine, a fixing device 4, a U-shaped metal member 3 and a structural adhesive 5, wherein the number and diameter of the shape memory alloy stranded wires 2 can be determined according to the load level, the tensile strength and the yield strength of the wood beam 1 along the grain direction according to the most unfavorable cross-sectional stress balance, first, the number and diameter of the shape memory alloy stranded wires 2 are 1 and 8mm, respectively, the shape memory alloy stranded wires 2 are arranged along the entire length of the wood beam 1, the cross-sectional size of the wood beam 1 is × 200mm, the length is 3200mm, a beam groove is formed on the surface of the grain of the wood beam 1 by using the grooving machine, the width and height of the beam groove are both 16mm, the length of the beam groove is equal to the length of the wood beam 1, that the wood groove is arranged along the entire length of the wood beam 1, the wood beam is cleaned after the groove is formed, the wood beam is kept in the groove, the fixing devices 4 are installed at both ends of the wood beam 1, the U-shaped stranded wires 2 are embedded into the wood beam, the shape memory alloy stranded wires 2, the shape memory alloy stranded wires are embedded into the wood beam 1, the shape memory alloy stranded wires 2, the shape memory alloy stranded wires are embedded into the wood beam is embedded into the wood beam, the wood beam is treated, the wood beam, the structural adhesive, the wood beam 1, the structural adhesive is treated.
While the preferred embodiments of the present invention have been described, those skilled in the art will appreciate that various changes and modifications can be made therein without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (8)
1. A method for reinforcing a wood beam by embedded shape memory alloy stranded wires is characterized by at least comprising the following steps:
s1, forming beam grooves on the surface of the cross grain of the wood beam (1) by using a grooving machine, wherein the beam grooves are arranged and extended along the full length of the wood beam (1);
s2, placing the shape memory alloy stranded wire (2) into a beam groove, and fixing the shape memory alloy stranded wire (2) in the beam groove by using a fixing assembly;
and S3, injecting structural adhesive (5) into the beam groove to enable the shape memory alloy stranded wire (2) to be bonded with the wood beam (1).
2. The method for reinforcing the wood beam by the embedded shape memory alloy stranded wire according to claim 1, wherein the method comprises the following steps: the number and the diameter of the shape memory alloy stranded wires (2) can be determined according to the load level, the tensile and compression strength of the wood beam (1) along the grain direction and the yield strength of the shape memory alloy according to the most unfavorable stress balance of the section.
3. The method for reinforcing the wood beam by the embedded shape memory alloy stranded wire according to claim 1, wherein the method comprises the following steps: the shape memory alloy stranded wires (2) are arranged along the whole length of the wood beam (1).
4. The method for reinforcing the wood beam by the embedded shape memory alloy stranded wire according to claim 1, wherein the method comprises the following steps: the width and the height of the beam groove are two times of the diameter of the shape memory alloy stranded wire (2).
5. The method for reinforcing the wood beam by the embedded shape memory alloy stranded wire according to claim 1, wherein the method comprises the following steps: after grooving, the residual wood chips in the beam groove are cleaned, and the beam groove is kept clean.
6. The method for reinforcing the wood beam by the embedded shape memory alloy stranded wire according to claim 3, wherein the method comprises the following steps: the fixing assembly used in the step S2 comprises a pair of fixing devices (4), wherein the pair of fixing devices (4) are respectively fixedly arranged at two ends of the wood beam (1) and are embedded with the shape memory alloy stranded wires (2).
7. The method for reinforcing the wood beam by the embedded shape memory alloy stranded wire according to claim 6, wherein the method comprises the following steps: the fixing assembly used in the step S2 further comprises a plurality of U-shaped metal pieces (3) fixedly inserted into the inner wall of the beam groove, the U-shaped metal pieces (3) are arranged along the length direction of the shape memory alloy stranded wire (2), and the U-shaped metal pieces (3) hoop and fix the shape memory alloy stranded wire (2).
8. The method for reinforcing the wood beam by the embedded shape memory alloy stranded wire according to claim 1, wherein the method comprises the following steps: in step S3, after the structural adhesive (5) is injected into the beam groove, a curing process is performed to bond the shape memory alloy stranded wire (2) to the wood beam (1) more tightly.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010223073.2A CN111395794A (en) | 2020-03-26 | 2020-03-26 | Method for reinforcing wood beam by embedded shape memory alloy stranded wire |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010223073.2A CN111395794A (en) | 2020-03-26 | 2020-03-26 | Method for reinforcing wood beam by embedded shape memory alloy stranded wire |
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| CN111395794A true CN111395794A (en) | 2020-07-10 |
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| CN202010223073.2A Pending CN111395794A (en) | 2020-03-26 | 2020-03-26 | Method for reinforcing wood beam by embedded shape memory alloy stranded wire |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111852069A (en) * | 2020-08-20 | 2020-10-30 | 西安建筑科技大学 | Concealed clear column head bucket arch cornice purlin self-resetting energy-consumption connecting node and method |
| CN114635581A (en) * | 2022-03-16 | 2022-06-17 | 东南大学 | Bucket arch hidden type reinforcing method based on three-dimensional seven-direction hybrid fiber ribs |
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| CN108824226A (en) * | 2018-08-09 | 2018-11-16 | 长安大学 | A kind of ruggedized construction and reinforcement means of reinforced column |
| CN109989481A (en) * | 2019-05-10 | 2019-07-09 | 上海市建筑科学研究院 | The timber structure beam column bolt joint and preparation method thereof that marmem is reinforced |
| CN110173130A (en) * | 2019-06-24 | 2019-08-27 | 西安建筑科技大学 | A kind of hidden reinforcing and shock absorption energy consuming device suitable for timber structure end bay Tenon node |
| CN110258361A (en) * | 2019-05-21 | 2019-09-20 | 大连理工大学 | A kind of method that shallow embedding formula shape-memory alloy wire repairs beams of concrete local cracks |
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2020
- 2020-03-26 CN CN202010223073.2A patent/CN111395794A/en active Pending
Patent Citations (5)
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|---|---|---|---|---|
| CN106639351A (en) * | 2016-12-23 | 2017-05-10 | 大连理工大学 | Reinforcing method for winding thermal excitation embedded shape memory alloy wires on concrete column |
| CN108824226A (en) * | 2018-08-09 | 2018-11-16 | 长安大学 | A kind of ruggedized construction and reinforcement means of reinforced column |
| CN109989481A (en) * | 2019-05-10 | 2019-07-09 | 上海市建筑科学研究院 | The timber structure beam column bolt joint and preparation method thereof that marmem is reinforced |
| CN110258361A (en) * | 2019-05-21 | 2019-09-20 | 大连理工大学 | A kind of method that shallow embedding formula shape-memory alloy wire repairs beams of concrete local cracks |
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| 蔡郭圣: "内嵌BFRP筋增强胶合木梁受弯性能试验研究", 《中国优秀博硕士学位论文全文数据库(硕士)工程科技Ⅰ辑》 * |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111852069A (en) * | 2020-08-20 | 2020-10-30 | 西安建筑科技大学 | Concealed clear column head bucket arch cornice purlin self-resetting energy-consumption connecting node and method |
| CN111852069B (en) * | 2020-08-20 | 2024-06-04 | 西安建筑科技大学 | Concealed self-resetting energy consumption connection node and method for bracket arch cornice of clear type column cap department |
| CN114635581A (en) * | 2022-03-16 | 2022-06-17 | 东南大学 | Bucket arch hidden type reinforcing method based on three-dimensional seven-direction hybrid fiber ribs |
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Application publication date: 20200710 |