A ball joint support node for a timber structure column base

Abstract

The application discloses a spherical hinge support node for a wood structure column foot and belongs to the technical field of wood structure buildings. The structure comprises a foundation stone, a vibration isolation sleeve A, a rigid column hub and a vibration isolation sleeve B, the foundation stone is provided with a blind hole A, the vibration isolation sleeve A and the rigid column hub are arranged in the blind hole A, and the rigid column hub is located on the inner side of the vibration isolation sleeve A, the rigid column hub is provided with a component mounting hole, and the vibration isolation sleeve B is arranged in the component mounting hole. The column foot of the wood structure is kept under full-section compression in the whole service life of the structure, the material performance is fully utilized, the stress concentration of the column foot caused by local compression and the tensile stress of the surrounding area are fundamentally eliminated, the local compression damage of the lower end of the column foot is prevented, and the safety and durability of the wood structure column foot are improved. In the radial direction of the column foot, the column foot is limited through the rigid column hub, the vibration isolation sleeve A and the blind hole A on the foundation stone, and the risk that the column foot slides out of the foundation stone is eliminated. The application has the advantages of simple assembly, time saving, high efficiency and the like.

Description

TECHNICAL FIELD

[0001] The application relates to a spherical hinge support joint for a wood structure column foot and belongs to the technical field of wood structure buildings. BACKGROUND

[0002] The column foot of a traditional wood structure is horizontally placed and floats on a foundation stone, and the foundation stone serves as a part of the foundation to bear the load of the upper structure. The floating support can transmit the vertical load and transmit the horizontal load through the friction between the column bottom surface and the foundation stone. Under the action of earthquake and wind load, relative sliding between the column bottom surface and the foundation stone can occur, so that the support has a certain vibration isolation effect. The horizontally placed floating support of the column foot has the following problems and deficiencies:

[0003] (1) Under the action of horizontal load, the column foot rotates and partially lifts the bottom surface, so that the edge of the column foot bottom surface is partially compressed. According to the stress characteristics of the partial compression, a large compressive stress concentration will occur in the partial compression area, and a transverse tensile stress will also occur in the surrounding area of the partial compression area. When the tensile stress in the surrounding area of the partial compression area exceeds the tensile strength of wood or the compressive stress in the partial compression area exceeds the compressive strength of wood, local damage will occur, and in severe cases, even the overall collapse of the wood structure will occur.

[0004] (2) When the horizontal load (wind, earthquake action) is large, the relative sliding between the column bottom surface and the foundation stone is large and cannot be restored to the original position, so that the overall structure and part of the components produce irreversible deformation, and then additional internal forces are generated, which causes safety hazards of the structure.

[0005] (3) The rotation of the column foot is accompanied by partial compression and lifting of the column foot, and the rotation capacity is limited.

[0006] The Chinese patent document with the publication number CN216196845U discloses a replaceable energy dissipation anti-collapse reinforcing device for a wood structure column foot joint, which increases the column bottom section by setting a device base on the upper part of the foundation stone, improves the restoring force caused by column rocking and the anti-overturning capacity of the column, prevents the column foot from sliding out of the foundation stone through the large friction between the device base and the foundation stone, thereby preventing the collapse of the wood structure, and enhances the energy dissipation capacity of the column foot when sliding through the extrusion deformation of the rubber layer arranged around the wood column, and further enhances the energy dissipation capacity of the wood column when sliding through the second line of defense of shock absorption and energy dissipation of the annular spring damper.

[0007] The device is mainly used for reinforcing the column foot of an existing wood structure building, and can solve the problems and deficiencies of the traditional horizontally placed floating support of the column foot to a certain extent, but it still has the following deficiencies:

[0008] Firstly, the device does not fundamentally change the stress mode of the traditional wood structure column foot, and the edge of the bottom surface of the column foot may still be damaged due to partial compression during rotation;

[0009] Secondly, there is still the risk of the column foot sliding out of the foundation stone;

[0010] Finally, the device has the disadvantages of complex assembly process, time-consuming and low efficiency. SUMMARY

[0011] To solve the above technical problems, the application provides a spherical hinge support node for a wooden structure column foot.

[0012] The application is realized by the following technical solutions:

[0013] The spherical hinge support node for the wooden structure column foot comprises a foundation stone, a vibration isolation sleeve A, a rigid column hub and a vibration isolation sleeve B, the foundation stone is provided with a blind hole A, the vibration isolation sleeve A and the rigid column hub are arranged in the blind hole A, and the rigid column hub is located on the inner side of the vibration isolation sleeve A, the rigid column hub is provided with a component mounting hole, and the vibration isolation sleeve B is arranged in the component mounting hole.

[0014] The vibration isolation sleeve A and the vibration isolation sleeve B are rubber rings.

[0015] The material of the rubber ring is butyl rubber or chlorosulfonated polyethylene rubber.

[0016] The Shore hardness of the rubber ring is between 50 and 60.

[0017] The rigid column hub is a steel basin, the steel basin is in a cylindrical shape, and the component mounting hole is coaxially arranged at one end of the steel basin.

[0018] The material of the steel basin is 42CrMo alloy steel or 25Cr2Mo1V alloy structural steel.

[0019] The Brinell hardness of the steel basin is between 200 and 250.

[0020] The component mounting hole comprises a blind hole B coaxially arranged at one end of the rigid column hub, and a hemispherical hole arranged at the bottom of the blind hole B, the radius of the hemispherical hole is smaller than the radius of the blind hole B, and the center of the hemispherical hole is located on the axis of the rigid column hub.

[0021] The spherical hinge support node further comprises a column foot, the lower end of the column foot is in a hemispherical shape, and the lower end of the column foot is inserted into the hemispherical hole and is attached to the surface of the hemispherical hole.

[0022] The bending moment M of the spherical hinge support node is calculated according to the following formula:

[0023]

[0024] In the formula, D is the diameter of the column foot, H is the height of the column foot, d, h and E are respectively the thickness, height and elastic modulus of the vibration isolation sleeve B, and θ is the included angle between the axis of the column foot and the axis of the rigid column hub.

[0025] The present application has the advantages of:

[0026] 1. The wood structure column foot is kept under full-section compression in the whole life cycle of the structure, the material performance is fully utilized, the stress concentration of the column foot caused by local compression and the tensile stress in the surrounding area are fundamentally eliminated, the local compression damage at the lower end of the column foot is prevented, and the safety and durability of the wood structure column foot are improved.

[0027] 2. In the radial direction of the column foot, the column foot is limited by the rigid column hub, the vibration isolation sleeve A and the blind hole A on the foundation stone, and the risk of the column foot sliding out of the foundation stone is eliminated.

[0028] 3. Under the action of earthquake, the column foot can slide horizontally, thereby increasing the vibration period of the structure and realizing energy dissipation and vibration isolation; the sliding amount of the column foot is limited within a certain range to ensure that the deformation of the wood structure building and its components is within the elastic range; in addition, after the earthquake, the column foot can be reset to the pre-earthquake position, and the wood structure building returns to the initial state.

[0029] 4. The rotation form of the column foot is closer to the ideal hinge joint type, which conforms to the calculation model of the column foot assumed hinge support in actual engineering.

[0030] 5. It has the advantages of simple assembly, time saving, high efficiency and the like. BRIEF DESCRIPTION OF DRAWINGS

[0031] Figure 1 is a structural schematic diagram of the present application;

[0032] Figure 2 is an exploded view of Figure 1 ; is a structural schematic diagram of the present application;

[0033] Figure 3 is a structural schematic diagram of the foundation stone of the present application;

[0034] Figure 4 is a structural schematic diagram of the vibration isolation sleeve A of the present application;

[0035] Figure 5 is a structural schematic diagram of the rigid column hub of the present application;

[0036] Figure 6 is a structural schematic diagram of the vibration isolation sleeve B of the present application;

[0037] Figure 7 is a structural schematic diagram of the column foot of the present application;

[0038] Figure 8 is a comparison diagram of the hysteretic curves of the column foot of the present application and the traditional wood structure column foot;

[0039] Figure 9 is a diagram of the maximum stress in the area of the traditional wood structure column foot;

[0040] Figure 10 The area maximum stress diagram of the column foot of the present application;

[0041] Figure 11 The comparative diagram of the calculation analysis and the finite element analysis of the node bending moment M of the present application.

[0042] In the figure: 1 - footing, 10 - blind hole A, 2 - vibration isolation sleeve A, 3 - rigid column hub, 30 - component mounting hole, 300 - blind hole B, 301 - semispherical hole, 4 - vibration isolation sleeve B, 5 - column foot. DETAILED DESCRIPTION

[0043] The technical solutions of the present application are further described below, but the scope of protection is not limited to the description.

[0044] As Figures 1 to 7 shown, the spherical hinge support node for the wood structure column foot of the present application comprises a footing 1, a vibration isolation sleeve A 2, a rigid column hub 3 and a vibration isolation sleeve B 4, the footing 1 is processed with a blind hole A 10, the vibration isolation sleeve A 2 and the rigid column hub 3 are installed in the blind hole A 10, and the rigid column hub 3 is located on the inner side of the vibration isolation sleeve A 2, the rigid column hub 3 is processed with a component mounting hole 30, and the vibration isolation sleeve B 4 is installed in the component mounting hole 30. In use, the footing 1 is the aboveground part of the structure foundation, the footing 1 is placed on the foundation, the blind hole A 10 is a circular hole and is coaxially arranged on the top of the footing 1. The lower end of the column foot 5 is inserted into the component mounting hole 30, which changes the installation mode and stress mode of the traditional wood structure column foot that is placed and floated on the footing 1, and avoids the damage of the column foot 5 at the bottom edge due to local compression during rotation; in the radial direction of the column foot 5, the column foot 5 is limited by the rigid column hub 3, the vibration isolation sleeve A 2 and the blind hole A 10 on the footing 1, and the risk of the column foot 5 sliding out of the footing 1 is eliminated; the spherical hinge support node has the advantages of simple assembly, time saving, high efficiency and the like.

[0045] The vibration isolation sleeve A 2 and the vibration isolation sleeve B 4 are rubber rings. In use, the vibration isolation sleeve A 2 is sleeved on the rigid column hub 3, and then the whole is placed in the blind hole A 10 on the footing 1, and the outer circular surface of the vibration isolation sleeve A 2 is in complete and close contact with the inner circular surface of the blind hole A 10; the vibration isolation sleeve A 2 mainly plays a vibration isolation role, and at the same time, due to the certain flexibility and elasticity of the vibration isolation sleeve A 2, the column foot 5 can slide within a certain range, and can recover to the initial position after sliding in a short time.

[0046] The vibration isolation sleeve B 4 is sleeved on the column foot 5, and after being combined into a whole with the column foot 5, is embedded in the steel basin, and the outer circular surface of the vibration isolation sleeve B 4 is in complete and close contact with the inner circular surface of the blind hole B 300; the main role of the vibration isolation sleeve B 4 is to separate the wood column and the steel basin, and prevent the mutual extrusion of the outer surface of the column foot 5 and the steel basin when the column foot 5 rotates, so as to cause the local damage of the wood column, and the outer sleeve vibration isolation sleeve B 4 of the wood column can buffer the extrusion force.

[0047] The material of the rubber ring is butyl rubber or chlorosulfonated polyethylene rubber. The rubber ring is made of rubber that is not easy to age and has good chemical stability and thermal stability, such as butyl rubber or chlorosulfonated polyethylene rubber.

[0048] The Shore hardness of the rubber ring is between 50 and 60. The rubber ring has a certain elasticity, and the column foot 5 will extrude the rubber ring to produce elastic deformation under the action of external load, and in this process, the column foot 5 dissipates energy by horizontal sliding or rotating; when the external load disappears, the rubber ring restores the deformation and drives the column foot 5 to reset, thereby realizing vibration isolation.

[0049] The rigid column hub 3 is a steel basin, and the steel basin is in a cylindrical shape, and the component mounting hole 30 is coaxially processed at one end of the steel basin.

[0050] The material of the steel basin is 42CrMo alloy steel or 25Cr2Mo1V alloy structural steel. In use, the steel basin is made of corrosion-resistant and wear-resistant steel materials, such as 42CrMo alloy steel or 25Cr2Mo1V alloy structural steel.

[0051] The Brinell hardness of the steel basin is between 200 and 250.

[0052] The component mounting hole 30 includes a blind hole B300 coaxially processed at one end of the rigid column hub 3, and a hemispherical hole 301 processed at the bottom of the blind hole B300, the radius of the hemispherical hole 301 is smaller than the radius of the blind hole B300, and the center of the hemispherical hole 301 is located on the axis of the rigid column hub 3. After the vibration isolation sleeve A2 is sleeved on the outer surface of the steel basin, it is placed flat in the blind hole A10, and the bottom surface of the steel basin is in contact with the bottom surface of the blind hole A10, and the surface of the hemispherical hole 301 is in complete contact with the spherical surface of the lower end of the column foot 5.

[0053] The spherical hinge support node further includes a column foot 5, the lower end of the column foot 5 is in a hemispherical shape, and the lower end of the column foot 5 is inserted into the hemispherical hole 301 and adheres to the surface of the hemispherical hole 301. In use, the lower end of the column foot 5 is processed into a hemispherical shape with the same diameter as the diameter of the wooden column, and when the column foot 5 is installed, the hemispherical surface of the lower end is in complete contact with the surface of the hemispherical hole 301, so that the column foot 5 of the wooden structure maintains full-section compression throughout its life cycle, fully utilizes the material performance, fundamentally eliminates the stress concentration of the column foot 5 caused by local compression and the tensile stress appearing in the surrounding area, and improves the safety and durability of the column foot 5 of the wooden structure.

[0054] The bending moment M of the spherical hinge support node is calculated according to the following formula:

[0055]

[0056] In the formula, D is the diameter of the column foot 5, H is the height of the column foot 5, d, h and E are the thickness, height and elastic modulus of the vibration isolation sleeve B4 respectively, and θ is the included angle between the axis of the column foot 5 and the axis of the rigid column hub 3.

[0057] A fine finite element model of the spherical hinge support node for the wood structure column foot is established by using the ABAQUS software, and the analysis shows that, compared with the traditional column foot flat floating support, the present application has the following advantages:

[0058] 1. As shown in Figure 8 Compared with the traditional column foot flat floating support, the present application has the following advantages:

[0059] 2. As shown in Figure 9 and Figure 10 By comparing the stress state of the wood column in the column foot 5 area, it is found that the peak compressive stress of the traditional column foot flat floating support is 5-6 times that of the spherical hinge support of the present application. It is shown that, in the rocking process caused by wind load and earthquake action, the bottom surface of the column foot 5 maintains full-section compression, effectively avoiding stress concentration and greatly reducing the peak compressive stress, so that local compression damage to the bottom surface of the wood column can be avoided, the normal service life of the wood column is maintained, and the support reliability of the wood structure building is improved.

[0060] 3. By using the spherical hinge support node, the column foot 5 can be restored to the initial position in a short time after sliding displacement, avoiding the change of structure shape caused by non-recoverable displacement of the column foot 5, and further generating additional bending moment, which has adverse effects on the wood structure building.

[0061] 4. Through mechanical theory analysis and finite element simulation, the approximate relationship between the bending moment of the spherical hinge support structure node and the column foot rotation angle can be obtained (Formula 1):

[0062]

[0063] Figure 11 For comparison of the calculated value of Formula 1 and the finite element simulation result, when the rotation angle is not greater than 0.02 rad, the two have high consistency, indicating that Formula 1 can be applied to engineering design.

Claims

1. A ball joint bearing node for a timber structure column base, characterized by: It comprises a foundation stone (1), a vibration isolation sleeve A (2), a rigid column hub (3) and a vibration isolation sleeve B (4), the foundation stone (1) is provided with a blind hole A (10), the vibration isolation sleeve A (2) and the rigid column hub (3) are arranged in the blind hole A (10), and the rigid column hub (3) is located on the inner side of the vibration isolation sleeve A (2), the rigid column hub (3) is provided with a component mounting hole (30), and the vibration isolation sleeve B (4) is arranged in the component mounting hole (30); The component mounting hole (30) comprises a blind hole B (300) coaxially arranged at one end of the rigid column hub (3) and a hemispherical hole (301) arranged at the bottom of the blind hole B (300), the radius of the hemispherical hole (301) is smaller than the radius of the blind hole B (300), and the center of the hemispherical hole (301) is located on the axis of the rigid column hub (3); The spherical hinge support node further comprises a column foot (5), the lower end of the column foot (5) is hemispherical, and the lower end of the column foot (5) is inserted into the hemispherical hole (301) and is attached to the surface of the hemispherical hole (301); The vibration isolation sleeve A (2) and the vibration isolation sleeve B (4) are rubber rings. The rigid column hub (3) is a steel basin, and the steel basin is cylindrical, and the component mounting hole (30) is coaxially arranged at one end of the steel basin.

2. A spherical hinge bearing foot node for a timber structure column according to claim 1, characterized in that: The material of the rubber ring is butyl rubber or chlorosulfurized polyethylene rubber.

3. The spherical hinge support joint for a wood structural column base of claim 1, wherein: The Shore hardness of the rubber ring is between 50 and 60.

4. The spherical hinge support joint for a wood structural column base of claim 1, wherein: The material of the steel basin is 42CrMo alloy steel or 25Cr2Mo1V alloy structural steel.

5. The spherical hinge support joint for a wood structural column base of claim 1, wherein: The Brinell hardness of the steel basin is between 200 and 250.

6. The spherical hinge support joint for a wood structural column base of claim 1, wherein: The joint moment of the spherical hinge support M The calculation is made according to the following formula: ， wherein: D is the diameter of the column foot (5), H is the height of the column foot (5), d , h , E are the thickness, height and elastic modulus of the vibration isolation sleeve B (4), respectively, θ is the angle between the axis of the column foot (5) and the axis of the rigid column hub (3).

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