CN207160625U - The timber structure Tenon node of device shape-memory alloy wire - Google Patents

Abstract

The utility model discloses a wooden structure mortise and tenon joint with shape memory alloy wire, which comprises a wooden column and a wooden beam connected to the wooden column through the mortise and tenon joint, and the wooden column and the wooden beam at the mortise and tenon joint are respectively connected up and down. There are several shape-memory alloy wires with the same number and the same diameter. One end of several shape-memory alloy wires is respectively fixed on the upper and lower ends of the wooden beam through horizontal steel plate connectors, and the other end is respectively fixed on the inside of the upper and lower surfaces of the wooden column through the wooden column clamp connector. ; The shape memory alloy wire is symmetrical up and down along the axis of the wooden beam. When the mortise and tenon joints rotate repeatedly, the shape memory alloy wire is repeatedly stretched and reset to bear the internal force of the wooden column and wooden beam. The utility model strengthens the shear bearing capacity and flexural bearing capacity of the mortise and tenon joints of the wooden structure, and the energy dissipation capacity is also significantly improved. It can be restored after an earthquake without residual deformation; it has good durability, corrosion resistance and fatigue resistance. performance.

Description

Wood structure mortise and tenon joints equipped with shape memory alloy wire

technical field

The utility model relates to an ancient building and a modern wooden structure mortise and tenon joint equipped with a shape memory alloy wire, which belongs to the field of ancient building wooden structure and modern wooden structure reinforcement protection, earthquake resistance and disaster reduction. It is suitable for the earthquake resistance and disaster reduction requirements of traditional wooden structures and modern wooden structures.

Background technique

Chinese ancient wooden structures have a long history and spread all over the country, containing valuable traditional construction skills and architectural culture. Existing ancient buildings include the Forbidden City in Beijing, the Wooden Pagoda in Ying County, Shanxi, the Chengde Mountain Resort, and the Dule Temple in Ji County. The beam-to-column connection of wooden structures in ancient buildings is mainly mortise and tenon joints, that is, the beam ends are made into mortise and tenon joints, and the column ends are made into mortise and tenon joints. The mortise and tenon joint has both rigidity and flexibility, and is a typical semi-rigid connection. Under the action of earthquake and wind loads, the mortise and tenon joints will be squeezed and deformed, and the mortise and tenon will be loosened or even pulled out, and its basic bearing capacity such as bending, shearing and torsion will be weakened. Most of the connection methods of modern wood structures are connected by steel connectors or partly by mortise and tenon joints, but the connection is weak, and its bending rigidity is small, which belongs to semi-rigid connection. The joint construction method of the above-mentioned wooden structure causes the overall lateral stiffness of the wooden frame to be insufficient. Under the action of dynamic loads such as earthquakes and cross winds, the overall structure is prone to strong dynamic response and large interstory lateral movement, resulting in the structure suffering severely damaged or even collapsed. Therefore, strengthening the mortise and tenon joints to reduce the overall dynamic response of the wooden frame and limit the lateral movement between floors is the focus of the repair and reinforcement of the wooden structure.

There are many common reinforcement materials for mortise and tenon joints in wooden structures, such as traditional materials such as steel plates, angle steels, and nails, as well as new materials such as mild steel and carbon fiber. On the one hand, although traditional materials such as steel plates, angle steel, and nails can strengthen the mortise and tenon joints of wooden structures, although the bearing capacity and energy dissipation performance of the joints can be improved, the bending stiffness of the mortise and tenon joints will be greatly improved, which will increase the rigidity of the entire structure. Its seismic response has increased significantly, which is not conducive to earthquake resistance; on the other hand, traditional materials such as steel plates, angle steels, and nails are prone to durability problems such as rust and corrosion when exposed to the air for a long time, posing potential safety hazards and affecting the appearance of the building; Or, since steel plates, angle steel, nails, mild steel and other materials are elastic-plastic materials, after the structure experiences a large earthquake, these materials themselves will have a large residual deformation, which cannot be restored to the original state, and the reinforcement materials need to be replaced. Secondary reinforcement of the structure. Carbon fiber cloth is a unidirectional carbon fiber reinforced product with strong tensile bearing capacity, but since the material itself can only bear tensile force, its shear bearing capacity in the vertical fiber direction is almost zero. Therefore, carbon fiber cloth is used to reinforce the mortise and tenon. Joints can only improve the flexural bearing capacity and flexural stiffness of mortise and tenon joints, but cannot improve their shear bearing capacity; in addition, carbon fiber cloth is brittle and has poor ductility, so strengthening the tenon and tenon joints cannot improve the energy dissipation capacity of the joints In addition, carbon fiber cloth and its adhesive materials are flammable products with extremely poor fire resistance. They are prone to burning or severe deformation under open flame or high temperature conditions, so they cannot be used any longer.

Therefore, it is necessary to use a new type of intelligent material to strengthen the mortise and tenon joints of ancient wooden structures and modern wooden structures. Shape memory alloy is a new type of functional material with a variety of special mechanical properties. It has a significant shape memory effect, Phase change superelastic and high damping properties. Compared with other materials, the shape memory alloy has good fatigue resistance and large recoverable strain (6%-8%). Therefore, the use of shape memory alloys for reinforcement, compared with other material reinforcement methods, has the characteristics of automatic recovery of deformation and high damping energy dissipation capacity. An effective solution for the repair of the structure itself or the cost of repair or replacement of reinforcement materials.

Utility model content

In order to solve the defects or deficiencies in the above background technology, the purpose of this utility model is to propose a mortise and tenon joint of ancient buildings and modern wooden structures equipped with shape memory alloy wires, so as to solve the problem of "overlapping" in the existing mortise and tenon joint reinforcement methods. Rigid", poor durability, large residual deformation, poor fire resistance and other problems. The mortise and tenon joint is reinforced with austenitic shape memory alloy wire, which greatly improves the energy dissipation capacity, durability and fire resistance of the joint without significantly improving the bending stiffness of the tenon and tenon joint, and can realize the deformation after deformation. The automatic reset of the overall structure improves the congenital defect of poor self-recovery ability of mortise and tenon joints. So as to solve the problems of building tilting and collapse caused by the dynamic response of earthquake, wind vibration or mechanical vibration, and avoid the secondary correction and reinforcement of the building after the earthquake.

The utility model is achieved through the following technical solutions.

A wood structure mortise and tenon joint equipped with shape memory alloy wire, including a wooden column and a wooden beam connected to the wooden column through the mortise and tenon joint. For shape memory alloy wires with the same shape and the same diameter, one end of several shape memory alloy wires is respectively fixed on the upper and lower end surfaces of the wooden beam through horizontal steel plate connectors, and the other end is respectively fixed on the inner side of the upper and lower cylinder surfaces of the wooden column through the wooden column clamp connector; The shape memory alloy wire is symmetrical up and down along the axis of the wooden beam. When the mortise and tenon joints rotate repeatedly, the shape memory alloy wire is repeatedly stretched and reset to bear the internal force of the wooden column and wooden beam.

Preferably, the horizontal steel plate connectors include horizontal steel plates respectively distributed on wooden beams, and vertical screw rods connecting the horizontal steel plates. Several adjustable pre-strain devices connected by steel plates.

Further, the adjustable pre-strain device includes several screws penetrating the vertical steel plate, nuts fixing the screws and adjusting bolts connecting the screws, and the adjusting bolts are vertically distributed along the screws.

Further, the rotating circular shaft is connected to the bearing support, and the rotating circular shaft is provided with the same number of grooves as the shape memory alloy wires, and the grooves can limit the displacement of the shape memory alloy wires.

Further, the vertical screw runs through the elliptical holes of the horizontal steel plate, and the elliptical holes are distributed on both sides of the bearing support of the horizontal steel plate and the vertical steel plate.

Preferably, the wooden column clamp connector includes a pair of arc-shaped steel plates connected to the wooden column, and bolts connecting the arc-shaped steel plates. screw.

Further, the horizontal screw is evenly distributed with pairs of flange nuts equal to the number of shape memory alloy wires, and each pair of flange nuts is used to fix the shape memory alloy wires.

Further, one end of several shape-memory alloy wires passes through the groove below the rotating shaft and is connected to the adjustable pre-strain device. On the wooden column, the flange and nut of the horizontal screw rod are paired; several shape memory alloy wires are adjusted to be equally stressed by adjusting bolts.

Effects and advantages of the utility model: the utility model utilizes the characteristics of shape memory alloys such as self-resetting and no residue after deformation, and the reinforced wooden structure mortise and tenon joints have significantly improved shear load-bearing capacity and bending load-bearing capacity, reducing energy consumption. The ability is also significantly improved, and it can be recovered after an earthquake without residual deformation. The anti-seismic performance of the reinforced joints is improved, which optimizes the anti-seismic performance of the entire structure.

The utility model has good durability, corrosion resistance and fatigue resistance.

The clamp is used to connect the shape memory alloy wire to the wooden structure without using wooden nails or wood screws, which will not cause any damage to the original structure, and achieve the repair and reinforcement principle of repairing the old as old and maintaining the original structure.

Description of drawings

Fig. 1 is the structural representation of the utility model;

Fig. 2 is the structural representation of horizontal steel plate and its attachments;

Figure 3(a) and Figure 3(b) are the front view of the horizontal steel plate and the cross-sectional view of Figure 3(a) A-A respectively;

Figure 4(a) and Figure 4(b) are the front view of the bearing support and the cross-sectional view of Figure 4(a) A-A respectively;

Figure 5(a), Figure 5(b) and Figure 5(c) are the front view, left view and top view of the vertical steel plate, respectively;

Fig. 6 is the structural representation of wooden column clamp;

Figure 7(a), Figure 7(b) and Figure 7(c) are the front view, left view and top view of the curved steel plate, respectively;

Figure 8(a), Figure 8(b) and Figure 8(c) are the front view, left view and top view of the square steel plate, respectively.

In the figure: 1. Wooden column; 2. Wooden beam; 3. Horizontal steel plate; 4. Vertical screw; 5. Curved steel plate; 6. Horizontal screw; 7. Square steel plate; 8. Flange nut; 9. Shape memory Alloy wire; 10. Rotating circular shaft; 11. Bearing support; 12. Vertical steel plate; 13. Adjustable pre-strain device. 13-1, screw rod; 13-2, nut; adjusting bolt 13-3.

Detailed ways

The utility model will be further described in detail below in conjunction with the accompanying drawings and embodiments, but it is not used as a basis for any limitation on the utility model.

As shown in Figure 1, the wood structure mortise and tenon joints of the device shape memory alloy wire of the present utility model include a wooden column 1 and a wooden beam 2 connecting the wooden column 1, and the upper and lower positions of the mortise and tenon joints are respectively connected with the same number and the same The diameter of the shape memory alloy wire 9, the connection position and connection method of the shape memory alloy wire 9 are symmetrical up and down along the axis of the wooden beam 2. Here, the upper half of the symmetrical part is taken as an example, and the lower end of the shape memory alloy wire 9 passes through a horizontal steel plate connector Fixed on the top of the wooden beam 2, the upper end of the shape-memory alloy wire 9 is fixed on the inner side of the wooden column 1 through the wooden column clamp 5. When the mortise and tenon joints of the wooden structure are rotated repeatedly, the shape-memory alloy wire 9 is repeatedly stretched and reset, and withstands Internal force of wooden column 1 and wooden beam 2.

As shown in Figure 2, Figure 3(a), and Figure 3(b), the horizontal steel plate connectors include horizontal steel plates 3 that are respectively distributed on the top and bottom of the wooden beam 2, and the horizontal steel plates 3 have four elliptical through holes using vertical screws 4 is fixed on the top surface of the wooden beam 2, and the horizontal steel plate 3 is respectively provided with a rotating circular shaft 10 supported by a bearing support 11 and several adjustable pre-strain devices 13 connected by a vertical steel plate 12. The adjustable pre-strain device 13 includes several screw rods 13-1 that pass through the vertical steel plate 12, the nut 13-2 that fixes the screw rod 13-1 and the adjusting bolt 13-3 that connects the screw rod 13-1, and the adjusting bolt 13-3 moves along the screw rod 13. -1 vertical distribution.

As shown in Figure 4(a) and Figure 4(b), the bearing support 11 is composed of the middle bearing and the support wrapped around the bearing, and the rotating circular shaft 10 is fixed on the horizontal steel plate 3 through the left and right bearing supports 11. On the rotating shaft 10, there are grooves equal to the number of shape memory alloy wires 9.

As shown in Figure 5(a), Figure 5(b) and Figure 5(c), the vertical steel plate 12 is composed of a long steel plate and two right-angled triangle steel plates on the left and right, and the horizontal steel plate 3 on the top surface of the wooden beam 2 is welded together. Above, the long steel plate has the same number of round holes as the shape memory alloy wires 9, and the round holes are equidistantly distributed along the length direction.

As shown in FIG. 6 , the wooden column clamp is fixed on the wall around the wooden column 1 and consists of two arc-shaped steel plates 5 and bolts connecting the arc-shaped steel plates 5 .

As shown in Fig. 1, Fig. 7(a), Fig. 7(b) and Fig. 7(c), Fig. 8(a), Fig. 8(b) and Fig. 8(c), the inside of the wooden column clamp 5 is welded front and back Two square steel plates 7 have round holes, and the round holes are connected with horizontal screw rods 6 . The horizontal screw is evenly distributed with the same number of flange nut pairs as the shape memory alloy wires, and each pair of flange nuts 8 is used to fix the shape memory alloy wires 9 . One end of several shape-memory alloy wires 9 passes through the groove below the rotating shaft 10 and is connected to the adjustable pre-strain device 13. The specific connection method is that one end of the shape-memory alloy wire 9 passes through the fixing screw 13-1 and is fixed on the adjusting bolt 13 -3, the other end is fixed on the horizontal screw rod 6 on the wall of the wooden column 1 through flange nuts 8 pairs; several shape memory alloy wires 9 are adjusted to be equally stressed by adjusting bolts 13-3.

Under the action of small earthquakes and major earthquakes, the engineering analysis of mortise and tenon joints of wooden structures is carried out, and the size and parameters of the reinforcement devices are determined according to the performance requirements to be achieved.

When the utility model is used to strengthen the mortise and tenon joints of wooden structures, the rotation of the joints is small during small earthquakes, and the stiffness of the reinforced joints increases, and the internal force is directly borne by the shape memory alloy wire; during large earthquakes, the joints rotate greatly, thereby driving the shape The memory alloy was repeatedly stretched and reset, dissipating a large amount of earthquake energy, and the reinforcement device began to play an energy-consuming role.

The utility model is not limited to the above-mentioned embodiments. On the basis of the technical solutions disclosed in the utility model, those skilled in the art can make some technical features based on the disclosed technical content without creative work. Replacement and deformation, these replacements and deformations are all within the protection scope of the present utility model.

Claims (8)

1. the timber structure Tenon node of device shape-memory alloy wire, including pin (1), pin is connected with by Tenon node (1) wooden frame (2), it is characterised in that：Pin (1) and wooden frame (2) at the Tenon node if between be connected to up and down Dry quantity is identical, diameter identical shape-memory alloy wire (9), and some shape-memory alloy wire (9) one end pass through horizontal steel plate Connector is separately fixed at wooden frame (2) upper and lower end face, and the other end is separately fixed at pin (1) up and down by pin clamp connection part On the inside of cylinder；The shape-memory alloy wire (9) is symmetrical above and below along wooden frame (2) axle center, when Tenon node occurs to rotate repeatedly, Occur to stretch and reset repeatedly by shape-memory alloy wire, bear the internal force of pin and wooden frame.

2. the timber structure Tenon node of device shape-memory alloy wire according to claim 1, it is characterised in that：The water Plain plate connector includes being respectively distributed to the horizontal steel plate (3) of wooden frame (2) up and down, and connects the perpendicular of upper and lower horizontal steel plate (3) To screw rod (4), it is respectively equipped with the horizontal steel plate (3) by the rotation circular shaft (10) of bearing spider (11) support and by vertical steel Several adjustable prestrain devices (13) of plate (12) connection.

3. the timber structure Tenon node of device shape-memory alloy wire according to claim 2, it is characterised in that：It is described can Prestrain device (13) is adjusted to include some screw rod (13-1), nut (13- of standing screw (13-1) through vertical steel plate (12) 2) vertically divide along screw rod (13-1) with the regulating bolt (13-3) of the connection screw rod (13-1), the regulating bolt (13-3) Cloth.

4. the timber structure Tenon node of device shape-memory alloy wire according to claim 2, it is characterised in that：Described turn Dynamic circular shaft (10) is connected on bearing spider (11), is rotated and is provided with circular shaft (10) and shape-memory alloy wire (9) equivalent amount Groove.

5. the timber structure Tenon node of device shape-memory alloy wire according to claim 2, it is characterised in that：It is described perpendicular Be applied in screw rod (4) in the elliptical aperture of horizontal steel plate (3), elliptical aperture be distributed in horizontal steel plate (3) bearing spider (11) and Vertical steel plate (12) both sides.

6. the timber structure Tenon node of device shape-memory alloy wire according to claim 1, it is characterised in that：The wood Post clamp connection part includes a pair of the curved plates (5) being connected on pin (1), and the bolt of connection curved plate (5), described Curved plate (5) on the inside of pin (1) is provided with the horizontal screw bolt (6) supported by square plate (7).

7. the timber structure Tenon node of device shape-memory alloy wire according to claim 6, it is characterised in that：The water It is evenly equipped with flat screw rod (6) and is used for the flange nut pair of shape-memory alloy wire (9) equivalent amount, each pair flange nut (8) Solid shape memory alloy wire (9).

8. the timber structure Tenon node of the device shape-memory alloy wire according to claim any one of 1-7, its feature exist In：Some shape-memory alloy wire (9) one end pass through along the groove rotated below circular shaft (10) and are connected to adjustable prestrain On device (13), specific connected mode is that shape-memory alloy wire (9) one end is fixed on regulation spiral shell through standing screw (13-1) On bolt (13-3), the other end is fixed on horizontal screw bolt (6) flange nut on pin (1) to upper；Some marmems Silk (9) adjusts stress equalization by regulating bolt (13-3).