A sliding hinge node and a sliding hinge structure

Abstract

The present invention relates to a sliding hinge node and a sliding hinge structure, which is used for hingedly connecting a first connecting member (1) and a second connecting member (4), comprising two parallel ear plates (2) fixed on the first connecting member (1), and a shaft pin (5) fixed on both sides of the second connecting member (4), wherein the ear plates (2) are provided with parallel sliding grooves (3), and the shaft pin (5) slides in the sliding grooves (3), and the design method adopts a finite element method and a calculation method. Compared with the prior art, the present invention has a higher lateral bearing capacity, is not prone to plastic deformation, is simple to process, and is economical to use.

Description

Technical Field

[0001] The invention relates to the technical field of building structures, and in particular to a sliding hinge node and a design method thereof. Background Art

[0002] Generally speaking, in the metal structure of construction engineering, for nodes that consider sliding hinges, they can be made through sliding bearing nodes, rocker nodes or oblong hole nodes. Sliding bearing nodes have high requirements on material hardness, complex structure, fine processing, and high cost; rocker nodes are relatively simple in form, but have poor out-of-plane stability, occupy a large space, and are not beautiful. Traditionally, the oblong hole node is more practical, that is, the circular pin hole on the ear plate is lengthened to an oblong hole, so that the node can rotate while having sliding space. This method is the simplest and most economical. However, the oblong hole has a defect, that is, the circle and the straight hole wall are theoretically infinitely small line contacts, and theoretically no pressure can be transmitted under ideal conditions. The stress in the material is infinite at first, and the pressure is transmitted through the deformation between the pin and the hole wall to form a surface contact. This mechanism makes it very easy for the contact point between the pin and the ear plate to undergo plastic deformation and slight damage. When the lateral pressure is large, the plastic deformation may directly cause the node to lose its ability to slide. When the lateral pressure is small, slight plastic deformation may accumulate over time and lead to considerable cumulative deformation, posing a safety hazard. Summary of the invention

[0003] The purpose of the present invention is to provide a sliding hinge node and a design method thereof in order to overcome the defects of the prior art.

[0004] The purpose of the present invention can be achieved by the following technical solutions:

[0005] A sliding hinge node is a hinge node used to hinge a first connecting member and a second connecting member, comprising two parallel ear plates fixed on the first connecting member, and axle pins fixed on both sides of the second connecting member, wherein the two ear plates are respectively provided with sliding grooves, and the axle pins slide in the sliding grooves.

[0006] Furthermore, the cross-section of the axle pin is a rounded rectangle.

[0007] Furthermore, the first connecting member and the second connecting member are building components such as beams, columns, supports or keels respectively.

[0008] Furthermore, the shaft pin and the slide slot can rotate relative to each other.

[0009] Furthermore, the dimensions of the axle pin satisfy:

[0010] Assuming that the contact surface is flat and has no bumps, the calculated normal stress is

[0011]

[0012] The magnitude of sliding friction is f = μN

[0013] For metal materials, the strength is taken as Von-Mises stress, and the shear stress and normal stress are considered to be consistent.

[0014] At the critical moment before slip occurs, the shear stress in the material is

[0015]

[0016] Combined with the normal stress, it becomes the Von-Mises stress.

[0017]

[0018] Among them, μ-sliding friction coefficient, N-maximum pressure, a-length of the shaft pin section, r-chamfer radius of the rounded rectangle of the shaft pin section, t-thickness of the ear plate, f d -Design value of metal material strength.

[0019] The above formula ensures that the metal will not be damaged due to extrusion slippage.

[0020] Furthermore, the dimensions of the axle pin (5) satisfy:

[0021] In extreme cases, where extrusion, sliding and rotation occur simultaneously, the metal will not enter plasticity, so it is necessary to ensure

[0022]

[0023] This corresponds to a situation where the extrusion pressure is very large, causing the pin shaft to fully contact the ear plate, which is also the most unfavorable situation for metal strength.

[0024] Furthermore, the dimensions of the axle pin (5) satisfy:

[0025] In the case where the pressure N is not very large, the pin and the lug will not be in full contact, but a larger rotation space is required. To ensure that there is sufficient rotation space and it does not get stuck, it is necessary to ensure

[0026] aθ<Bb

[0027] Wherein: a-length of the shaft pin section, b-width of the shaft pin section, B-width of the slideway, L-length of the slideway, θ-angle of the shaft pin in the slideway.

[0028] Furthermore, the dimensions of the axle pin (5) satisfy:

[0029] Ensure sufficient telescopic slip, that is, meet

[0030] a+x+ +x - ≤L

[0031] Where: a-length of the shaft pin section, b-width of the shaft pin section, B-width of the slideway, x + - The distance from the left side of the axle pin to the left edge of the slide, x - -The distance from the right side of the axle pin to the right edge of the slide, L-the length of the slide, θ-the rotation angle of the axle pin in the slide.

[0032] A sliding hinge structure comprises a first connecting member, a second connecting member and the above-mentioned sliding hinge node.

[0033] Compared with the prior art, the present invention has the following beneficial effects:

[0034] 1. Compared with the oblong hole pin node, the contact stress between the pin and the pin hole wall of the present invention is small, the material properties are fully utilized, and there is a higher lateral bearing capacity.

[0035] 2. Compared with the oblong hole pin shaft node, the present invention is more durable and less prone to plastic deformation or damage.

[0036] 3. Compared with the sliding bearing node and the rocker arm node, the present invention is simple to process and is economical and practical.

[0037] 4. Compared with the rocker arm node, the present invention is small in size and will not occupy excessive building space or affect the appearance. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] Figure 1 A three-dimensional perspective view of the general form of the invention;

[0039] Figure 2 A schematic diagram of a second connecting member of a non-through node of the present invention;

[0040] Figure 3 A schematic diagram of a first connecting member of a non-through node of the present invention;

[0041] Figure 4 It is a simplified diagram of the dimension symbols of the present invention;

[0042] Figure 5 It is a schematic diagram of the dimension symbols of the present invention in a rotating state;

[0043] Figure 6 It is a simplified diagram of force calculation in the practical design method of the present invention.

[0044] The numbers in the figure show:

[0045] 1. first connecting piece, 2. ear plate, 3. slide groove, 4. second connecting piece, 5. shaft pin. DETAILED DESCRIPTION

[0046] The present invention is described in detail below with reference to the accompanying drawings and specific embodiments.

[0047] Example

[0048] A sliding hinge node, such as Figure 1-3 As shown, the hinge node for hingedly connecting the first connecting member 1 and the second connecting member 4 includes two parallel ear plates 2 fixed on the first connecting member 1, and axle pins 5 fixed on both sides of the second connecting member 4. The ear plates 2 are provided with parallel slide grooves 3, and the axle pins 5 slide in the slide grooves 3. The cross section of the axle pin 5 is a rounded rectangle. The first connecting member 1 and the second connecting member 4 are building components such as beams, columns, supports or keels. The axle pin 5 and the slide groove 3 can rotate relative to each other.

[0049] like Figure 4-6 As shown, a hinged node with a sliding distance of ±100 mm, a required rotation angle of 0.03 rad, and a hinged node bearing a lateral force of 500 kN is used as an example to illustrate the design method of the present invention.

[0050] The design uses Q345 steel with a material strength of not less than 270MPa, pin a = 50mm, chamfer radius r = 10mm, hole width B = 73mm, gap between pin and hole wall 3mm, total length of long hole of ear plate 2 L = 300mm, thickness of ear plate 2 40mm, and friction coefficient of contact surface between steel materials 0.3. The following is the node design verification.

[0051] First, the applicability is confirmed. The force on this node is obviously larger, and the rotation angle is relatively small relative to the sliding distance, so it is suitable to use the node of the present invention.

[0052] Second, calculate the extrusion stress. Assuming that the contact surface is flat and has no bumps, the calculated normal stress is

[0053]

[0054] Third, calculate the sliding friction. The friction force is f = μN = 0.3 × 500 / 2 = 75 kN

[0055] Fourth, strength verification.

[0056]

[0057]

[0058] satisfy.

[0059] In the extreme case, that is, when compression, slippage and rotation occur simultaneously,

[0060]

[0061] satisfy.

[0062] Fifth, rotation capacity verification:

[0063] aθ=70×0.03=2.1mm<Bb=3mm

[0064] satisfy.

[0065] Finally, the sliding distance is checked:

[0066] a+x + +x _ =70+100+100=270≤L=300mm

[0067] satisfy.

[0068] Therefore, the cross-sectional dimensions adopted in the design meet the requirements.

[0069] The above description of the embodiments is to facilitate the understanding and use of the invention by those skilled in the art. It is obvious that those skilled in the art can easily make various modifications to these embodiments and apply the general principles described herein to other embodiments without creative work. Therefore, the present invention is not limited to the above embodiments, and improvements and modifications made by those skilled in the art based on the disclosure of the present invention without departing from the scope of the present invention should be within the scope of protection of the present invention.

Claims

1. A sliding hinge node, a hinge node for hingedly connecting a first connecting member (1) and a second connecting member (4), characterized in that: It comprises two parallel ear plates (2) fixed on a first connecting member (1), and an axle pin (5) fixed on both sides of a second connecting member (4), wherein the two ear plates (2) are respectively provided with a slide groove (3), and the axle pin (5) slides in the slide groove (3); The dimensions of the shaft pin (5) meet the following conditions: Assuming that the contact surface is flat and has no bumps, the calculated normal stress is The magnitude of sliding friction is f=μN For metal materials, the strength is taken as Von-Mises stress, and the shear stress and normal stress are considered to be consistent. At the critical moment before slip occurs, the shear stress in the material is Combined with the normal stress, it becomes the Von-Mises stress. In extreme cases, where extrusion, sliding and rotation occur simultaneously, the metal will not enter plasticity, so it is necessary to ensure To ensure that there is sufficient rotational clearance to prevent jamming, it is necessary to ensure aθ <B-b; The node can ensure sufficient expansion and contraction slip, that is, satisfy a+x + +x - ≤L; Among them, μ-sliding friction coefficient, N-maximum pressure, a-length of the shaft pin section, r-chamfer radius of the rounded rectangle of the shaft pin section, t-thickness of the ear plate, f d - Design value of metal material strength; b- Width of the pin cross section, B- Width of the slideway, L- Length of the slideway, θ- Angle of rotation of the pin in the slideway; x + - The distance from the left side of the axle pin to the left edge of the slide, x - -Distance from the right side of the axle pin to the right edge of the slideway.

2. A sliding hinge node according to claim 1, characterized in that: The cross section of the axle pin (5) is a rounded rectangle.

3. A sliding hinge node according to claim 1, characterized in that: The first connecting member (1) and the second connecting member (4) are respectively beams, columns, supports or keels.

4. A sliding hinge node according to claim 1, characterized in that: The shaft pin (5) and the slide groove (3) can rotate relative to each other.

5. A sliding hinge structure, comprising a first connecting member (1), a second connecting member (4) and a sliding hinge node, characterized in that: The sliding hinge node adopts any one of the sliding hinge nodes described in claims 1-4.

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