CN112963010B

CN112963010B - Reinforced mortise and tenon joint device

Info

Publication number: CN112963010B
Application number: CN202110485012.8A
Authority: CN
Inventors: 淳庆; 张承文; 彭贝; 林怡婕
Original assignee: Southeast University
Current assignee: Southeast University
Priority date: 2021-04-30
Filing date: 2021-04-30
Publication date: 2023-02-21
Anticipated expiration: 2041-04-30
Also published as: CN112963010A

Abstract

The invention belongs to the field of ancient building restoration, and discloses a reinforcing tenon-and-mortise joint device. The reinforcing device comprises two symmetrical wooden sparrow-shaped wood boards, a shape memory alloy board, a carbon fiber rib, a first component and a second component, wherein two ends of the shape memory alloy strip are respectively connected with the first steel board and the second steel board through split bolts, two ends of the two carbon fiber ribs are respectively inserted into the first iron component and the second iron component to be fixed, and the two symmetrical wooden sparrow-shaped wood boards are mutually spliced and wrap the first component and the second component. According to the reinforcing method, the semi-rigidity of the mortise and tenon joint is guaranteed by the shape memory alloy strips, and meanwhile, the excessive displacement between the beams and the columns is limited by the carbon fiber ribs, so that the continuous collapse resistance effect is achieved, the automatic reset of the deformed joint can be realized, and the reinforcing effect of the mortise and tenon joint is further enhanced.

Description

Reinforced mortise and tenon joint device

Technical Field

The utility model belongs to ancient building restoration field, concretely relates to consolidate mortise and tenon joint device.

Background

The stressed members in the historic building timber structure are all connected by adopting mortise and tenon joints, and the joint has remarkable semi-rigid characteristic and has better energy consumption effect on the dynamic load of wind vibration, earthquake and the like. However, in the old timber structure building, the mortise and tenon joint is damaged, so that the bearing capacity of the structure is weakened, and even the mortise and tenon joint is damaged before the beam column and other members in the earthquake. Therefore, in the repair and reinforcement engineering of the wood structure ancient building, the mortise and tenon joint is often a key part for reinforcement and protection.

Common tenon-and-mortise joint reinforcing modes mainly include steel reinforcing (adopting angle steel, steel plates, reinforcing steel bars, iron cramps and the like as reinforcing materials) and carbon fiber Cloth (CFRP) reinforcing. Although the steel reinforcing method can improve the bending resistance and shearing resistance bearing capacity of the mortise and tenon joint, the bending rigidity of the joint is greatly improved, the joint becomes ultra-rigid, the basic stress characteristics and structural characteristics of the historic building wood structure are greatly changed, the mortise and tenon joint structure does not belong to a semi-rigid structure any more, the energy consumption effect is reduced when an earthquake occurs, and the earthquake resistance is unfavorable; in addition, materials such as angle steel, steel plate, reinforcing bar, iron cramp are easy to be corroded during the structural service period, the reinforcing safety reserve is reduced, and the building appearance is influenced. The strength of the Fiber Reinforced Polymer (FRP) material is about 10 times that of the steel bar, the weight of the FRP material is only 1/5 of that of the steel, and the FRP material has the characteristics of light weight, high elasticity, high strength, high durability and the like, so that the carbon fiber bars are adopted to reinforce the mortise and tenon joint, the bending resistance bearing capacity of the mortise and tenon joint can be obviously improved, and the mortise and tenon joint can obtain proper bending resistance rigidity. However, the carbon fiber reinforcement is a zero-damping material, which can only enhance the strength and rigidity of the node after reinforcement, but cannot improve the energy consumption capability, and cannot play the energy consumption and shock absorption role in dealing with the earthquake.

Disclosure of Invention

To prior art's not enough, this disclosed aim at provides a consolidate tenon fourth of twelve earthly branches node device, solves the poor problem of power consumption ability that exists among the current reinforcement tenon fourth of twelve earthly branches node.

The purpose of the present disclosure can be achieved by the following technical scheme:

a device for reinforcing mortise and tenon joints comprises a shape memory alloy strip, wherein the shape memory alloy strip is bent at a connecting point of a mortise opening and a tenon, so that part of the shape memory alloy strip forms a long horizontal section close to a wood beam, and the other part of the shape memory alloy strip forms a long vertical section close to a wood column;

and two ends of the shape memory alloy strip are fixedly connected with the corresponding wood beam and the corresponding wood column.

In some embodiments, the shape memory alloy strip is provided with inward filling ports at two ends, and the filling ports are connected through carbon fiber ribs.

In some embodiments, the filling port is filled with an epoxy adhesive, and the carbon fiber rib is fixed in the filling port by using the epoxy adhesive.

In some embodiments, the two end points of the carbon fiber ribs and the bottom end of the filling port are spaced.

In some embodiments, the spacing is between 5mm and 10mm.

In some embodiments, two symmetrical wooden spareties are spliced to each other and the entirety of the shape memory alloy strip and the carbon fiber bar is wrapped.

In some embodiments, the width of the shape memory alloy strip is equal to 0.9 times the width of the wood beam.

The beneficial effect of this disclosure:

1. shape memory alloy is a high damping material; the normal-temperature shape memory alloy is combined with the fiber reinforced polymer material, so that the damping performance of the fiber reinforced polymer material can be greatly enhanced, the bending resistance bearing capacity and rigidity of the mortise and tenon joint are improved, meanwhile, the seismic energy can be dissipated through the damping energy dissipation effect, and the original semi-rigid characteristic of the mortise and tenon joint is kept.

2) When the tenon is pulled out, the shape memory alloy strip is deformed and can restore to deform, so that the automatic reset of the deformed tenon-and-mortise joint can be realized.

3) When the wood beam is bent or rotationally deformed, the carbon fiber ribs can play a role of inclined struts under the restraint of the wooden sparrow. Under the action of earthquake, when the displacement is small, the carbon fiber ribs and the fixing device have certain gaps and do not act, so that the semi-rigidity of the node is ensured; when the earthquake action is larger, the clearance is eliminated, and the carbon fiber ribs bear the acting force, so that the strength of the node is improved. Therefore, the device plays a role in resisting continuous collapse while keeping the semi-rigidity of the node.

4) The reinforcing method is concealed, and can play a role in originally reinforcing and repairing the appearance of the wooden tenon-and-mortise joint of the historic building.

Drawings

In order to more clearly illustrate the embodiments or technical solutions in the prior art of the present disclosure, the drawings used in the description of the embodiments or prior art will be briefly described below, and it is obvious for those skilled in the art that other drawings can be obtained based on these drawings without creative efforts.

FIG. 1 is a schematic structural view of the present invention;

FIG. 2 is a schematic view of a partial structure of the present invention;

FIG. 3 is a schematic view of the structure of the shape memory alloy strip of the present invention;

FIG. 4 is a schematic structural view of two carbon fiber ribs according to the present invention;

FIG. 5 is a schematic structural diagram of a first iron art component of the present invention;

FIG. 6 is a schematic structural view of a second iron art component of the present invention;

FIG. 7 is a schematic structural diagram of a first steel plate in the present invention;

FIG. 8 is a schematic structural view of a second steel plate according to the present invention;

wherein 1 is a wood beam; 2 is a wood column; 3, a tenon; 4, a mortise opening; 5 is a first steel plate; 6 is a first iron art component; 7 is a second steel plate; 8 is an iron art component II; 9. 10 is a wood sparrow-shaped wood board; 11 is a shape memory alloy strip; 12. 13 is a carbon fiber rib; 14 is a split bolt; 15 is an epoxy resin adhesive; 16 is a self-tapping screw.

Detailed Description

The technical solutions in the embodiments of the present disclosure will be described clearly and completely with reference to the drawings in the embodiments of the present disclosure, and it is obvious that the embodiments described are only some embodiments of the present disclosure, rather than all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments disclosed herein without making any creative effort, shall fall within the protection scope of the present disclosure.

A reinforced mortise and tenon joint device is shown in figures 1 to 8 and comprises a tenon 3 at the end of a wood beam 1 and a mortise opening 4 in a wood column 2, wherein the tenon 3 is inserted into the mortise opening 4. Two ends of the shape memory alloy strip 11 are respectively connected with the first steel plate 5 and the second steel plate 7 through split bolts 14, and two ends of the two

carbon fiber ribs

12 and 13 are respectively inserted into the first iron art component 6 and the second iron art component 8 to be fixed. The wood beam 1 is connected with the first steel plate 5, and the wood column 2 is connected with the second steel plate 7. Two symmetrical

wooden spareties

9, 10 are spliced with each other and wrapped in each of the above members.

Shape memory alloys are a high damping material. By high damping, it is meant that the dissipation factor of the shape memory alloy material can be on the order of 10-1, whereas the dissipation cage of common metals, such as steel and aluminum, is only about 0.005. Therefore, the normal-temperature shape memory alloy is combined with the fiber reinforced polymer material, so that the damping performance of the fiber reinforced polymer material can be greatly enhanced, the bending resistance bearing capacity and rigidity of the mortise and tenon joint are improved, meanwhile, the seismic energy can be dissipated through the damping energy dissipation effect, and the original semi-rigid characteristic of the mortise and tenon joint is kept; when the tenon is pulled out, the shape memory alloy strip is deformed and can restore to deform, so that the automatic reset of the deformed tenon-and-mortise joint can be realized.

The shape memory alloy strip 11 comprises a long horizontal section 1101 and a long vertical section 1102 in the middle, and short horizontal sections 1103 and short vertical sections 1104 on two sides, wherein the long horizontal section 1101 is next to a wood beam, and the long vertical section 1102 is next to a wood column;

meanwhile, when the wood beam is bent or rotationally deformed, the carbon fiber ribs can play a role of inclined struts under the restraint of the wood sparrow. Under the action of earthquake, when the displacement is small, the carbon fiber ribs and the fixing device have certain gaps and do not act, so that the semi-rigidity of the node is ensured; when the earthquake action is larger, the clearance is eliminated, the carbon fiber ribs bear the acting force, and the strength of the node is improved. Therefore, the device has the function of resisting continuous collapse while keeping the semi-rigidity of the node;

two symmetrical

wooden spareties

9 and 10 are spliced with each other and wrapped in the members, so that the reinforcing method is concealed, and the effect of original true reinforcing and repairing of the appearance of the wooden tenon-and-mortise joint of the historic building can be achieved.

The width of the shape memory alloy strip 11 is equal to 0.9 time of the width of the wood beam, and the length of the long horizontal section 1101 is 0.9 of the length of the

wooden spareties

9 and 10; on the premise of ensuring the reinforcing strength, the size of the reinforcing device needs to be limited, and 0.9 is a numerical value which is obtained according to engineering experience, is convenient to construct and ensures the concealment of the device.

The first iron art component 6 is composed of two flat

straight sections

601 and 602 and a uncovered isosceles right-angle thin-wall triangular prism 603, the two flat

straight sections

601 and 602 are respectively connected with two right-angle sides of the isosceles right-angle thin-wall triangular prism 603, the length of the flat straight section 601/602 plus the length of the right-angle side of the isosceles right-angle thin-wall triangular prism 603 is equal to the length of a short vertical section 1104 of the shape memory alloy strip 11, a notch is formed in the bevel edge of the isosceles right-angle thin-wall triangular prism 603 and filled with epoxy resin adhesive 15, the flat straight section 601 is parallel to and close to a long horizontal section 1101 of the shape memory alloy strip 11, the flat straight section 602 is parallel to and close to a short vertical section 1104 of the shape memory alloy strip 11, two self-tapping screws 16 are arranged at the tail end of the flat straight section 601 to fix the flat straight section with the long horizontal section 1101 of the shape memory alloy strip 11 and the wood beam 1, and two counter-pulling bolts 14 are arranged at the tail end of the flat straight section 602 to fix the short vertical section 1104 of the shape memory alloy strip 11 and the steel plate 5. The second iron art member 8 and the first iron art member 6 are identical in shape and are arranged at the joint of the long vertical section 1102 and the short horizontal section 1103 of the shape memory alloy strip 11.

The directions of the

carbon fiber ribs

12 and 13 are parallel to the oblique edges of the wooden sparrow-

shaped wood boards

9 and 10, and two ends of the carbon fiber ribs are respectively inserted into the epoxy resin adhesive 15 in the first iron art component 6 and the second iron art component 8, so that a 10mm gap is reserved between the carbon fiber ribs and the

iron art components

6 and 8; the constraint of 10mm is the allowed displacement of the mortise and tenon joint under the action of earthquake. When the displacement is less than the value, the semi-rigidity of a certain node is reserved due to the bonding and sliding characteristics between the carbon fiber ribs and the colloid. When the displacement exceeded this value, carbon fiber muscle and both ends compaction were because this displacement still is less than the bonding destruction limit value this moment for the structural adhesive still plays a role, then the fiber muscle has played the supporting role.

The first steel plate 5 is an L-shaped steel plate and comprises two

straight sections

501 and 502, the two

straight sections

501 and 502 are equal in length and equal to the length of a short vertical section 1104 of the shape memory alloy strip 11, the straight sections 501 are parallel to and abut against the wood beam 1, two self-tapping screws 16 are arranged at the tail ends of the straight sections 501 to fix the straight sections with the wood beam 1, the straight sections 502 are parallel to and abut against the short vertical section 1104 of the shape memory alloy strip 11, and two split bolts 14 are arranged at the tail ends of the straight sections 502 to fix the straight sections with the short vertical section 1104 of the shape memory alloy strip 11 and the first iron art component 6.

The second steel plate 7 is an L-shaped steel plate and comprises two straight sections 701 and 702, the lengths of the two straight sections 701 and 702 are equal and equal to the length of the short horizontal section 1103 of the shape memory alloy strip 11, the straight sections 701 are parallel to and abut against the wood column 2, two self-tapping screws 16 are arranged at the tail ends of the straight sections 701 to fix the straight sections with the wood column 2, the straight sections 702 are parallel to and abut against the short horizontal section 1103 of the shape memory alloy strip 11, and two split bolts 14 are arranged at the tail ends of the straight sections 702 to fix the straight sections with the short vertical section 1104 of the shape memory alloy strip 11 and the second iron art component 8.

The total thickness of the two symmetrical wooden sparrow-shaped

wood boards

9 and 10 is less than or equal to the width of the wood beam 1.

A device for reinforcing mortise and tenon joints comprises the following steps:

1) Fixing the long horizontal section of the shape memory alloy strip and the first iron art component under the wood beam by using 2 self-tapping screws;

2) Filling an epoxy resin adhesive into the notch of the first iron art member and inserting one end of each of the two carbon fiber ribs into the epoxy resin adhesive;

3) Adjusting the angles of the two carbon fiber bars and the position of the second iron art component, inserting the other ends of the two carbon fiber bars into the epoxy resin adhesive in the notch of the second iron art component, and fixing the second iron art component and the long vertical section of the shape memory alloy on the wood column by using 2 self-tapping screws;

4) Connecting the first steel plate and the second steel plate with the first iron art component, the second iron art component and the memory alloy by using 4 split bolts;

5) And 4 self-tapping screws are used for fixing the first steel plate and the second steel plate on the wood beam and the wood column.

6) The components are wrapped by two wood sparrow wood boards, and the effect of original true restoration is achieved.

The shape memory alloy damper reinforced mortise and tenon joint and the reinforcing method thereof are only exemplary embodiments, the implementation of the invention is not limited thereto, and any creative modification and deformation based on the scheme is still within the protection scope of the invention.

In the description herein, references to the description of "one embodiment," "an example," "a specific example," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the disclosure. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

The foregoing illustrates and describes the general principles, principal features, and advantages of the present disclosure. It will be understood by those skilled in the art that the present disclosure is not limited to the embodiments described above, which are presented solely for illustrating the principles of the disclosure, and that various changes and modifications may be made within the scope of the disclosure as claimed without departing from the spirit and scope of the disclosure.

Claims

1. A device for reinforcing mortise and tenon joints is characterized by comprising a shape memory alloy strip, wherein the shape memory alloy strip is bent at a connecting point of a mortise and tenon, so that part of the shape memory alloy strip forms a long horizontal section close to a wood beam, and the other part of the shape memory alloy strip forms a long vertical section close to a wood column;

the two ends of the shape memory alloy strip are fixedly connected with the corresponding wood beam and the corresponding wood column;

the two ends of the shape memory alloy strip are provided with inward filling ports, and the filling ports are connected through carbon fiber ribs;

the filling port is filled with an epoxy resin adhesive, and the carbon fiber bar is fixed in the filling port by using the epoxy resin adhesive;

the filling opening is a notch of the first iron art component and the second iron art component;

both ends of the carbon fiber ribs and the bottom end of the filling port are kept at intervals;

the first iron art component is composed of two straight sections and a uncovered isosceles right-angle thin-wall triangular prism, wherein the two straight sections are respectively connected with two right-angle sides of the isosceles right-angle thin-wall triangular prism, the length of the straight sections plus the length of the right-angle sides of the isosceles right-angle thin-wall triangular prism is equal to the length of a short vertical section of the shape memory alloy strip, the bevel edge of the isosceles right-angle thin-wall triangular prism is provided with a notch and filled with epoxy resin adhesive, the straight sections are parallel to and abut against a long horizontal section of the shape memory alloy strip, the straight sections are parallel to and abut against a short vertical section of the shape memory alloy strip, the straight sections are fixed with the long horizontal section of the shape memory alloy strip and a wood beam, and the straight sections are fixed with the short vertical section of the shape memory alloy strip and a steel plate at the tail end of the straight sections;

the second iron art component and the first iron art component are identical in shape.

2. A reinforced mortise and tenon joint device according to claim 1, wherein the pitch is 5mm to 10mm.

3. The device of claim 1, wherein two symmetrical wooden brackets are spliced together and wrap the shape memory alloy strip and the carbon fiber bar together.

4. A device according to claim 1, characterised in that said shape memory alloy strip has a width equal to 0.9 times the width of said beam.