Hinged sliding joint for connecting a roof truss post to a roof truss top chord

Abstract

The application relates to a hinged sliding joint for connecting a skylight frame column and a roof frame top chord, which comprises a roof frame top chord, a column end plate fixed to the bottom end of the skylight frame column, a sliding assembly arranged between the column end plate and the roof frame top chord, which is used for enabling the column end plate to horizontally slide relative to the roof frame top chord, and a shear assembly used for transmitting the horizontal shear force between the column end plate and the roof frame top chord while allowing the horizontal sliding. The hinged sliding joint for connecting the skylight frame column and the roof frame top chord is designed to effectively enable the column end plate to horizontally slide relative to the roof frame top chord through the sliding assembly, so as to release the structural deformation caused by temperature change; meanwhile, the configured shear assembly can reliably transmit the horizontal shear force between the column end plate and the roof frame top chord on the premise of allowing the horizontal sliding.

Description

Technical Field

[0001] This application relates to the field of building engineering technology, and in particular to a hinged sliding joint for connecting skylight frame columns and roof truss upper chords. Background Technology

[0002] In large-span steel structure buildings, such as large factories, stadiums, and convention centers, the connection node between the skylight frame and the main roof truss is a critical point for coordinating stress and deformation. This node not only needs to reliably transfer the weight of the skylight frame itself, as well as the loads from wind and snow, to the roof truss structure below, but it must also be able to accommodate the deformation of the entire large-span roof truss system caused by environmental factors, especially temperature changes.

[0003] Currently, in engineering practice, the connection between the skylight frame columns and the roof truss upper chord is mostly achieved using traditional welding or ordinary high-strength bolts. These connection methods typically create a semi-rigid or fully rigid constraint state at the joints. However, this rigid connection method exposes serious technical defects in areas with large spans, especially in regions with significant annual temperature differences (e.g., exceeding 40°C). Due to the significant thermal expansion and contraction properties of steel, the massive roof truss structure will experience considerable horizontal expansion and contraction deformation under seasonal or diurnal temperature variations.

[0004] However, rigid or semi-rigid nodes severely restrict the free release of this deformation, leading to the accumulation of huge, avoidable temperature stresses inside the structure. These stresses are prone to cause stress concentration in the nodes and adjacent member areas, which not only significantly reduces the fatigue resistance of the structure, accelerates the fatigue failure of materials, and shortens the service life of the structure, but may even lead to insufficient strength of the members and buckling or fracture under extreme temperature difference conditions, posing a serious safety hazard. Utility Model Content

[0005] To address the aforementioned issues, this application provides a hinged sliding joint for connecting skylight frame columns and roof truss upper chords, which effectively releases temperature deformation while reliably transmitting horizontal shear force.

[0006] To achieve the above objectives, the hinged sliding joint designed in this application for connecting the skylight frame column and the upper chord of the roof truss includes: Upper chord of the roof frame; The column end plate is fixed to the bottom end of the skylight frame column; A sliding assembly, disposed between the column end plate and the upper chord of the roof truss, is used to allow the column end plate to slide horizontally relative to the upper chord of the roof truss; and... Shear-resistant components are used to transmit the horizontal shear force between the column end plate and the upper chord of the roof truss while allowing the horizontal slippage.

[0007] Preferably, the sliding component includes: At least one PTFE plate is disposed between the column end plate and the upper chord of the roof truss; An elongated hole is formed on the end plate of the column, the length of which is aligned with the transverse direction of the upper chord of the roof truss; and, Bolts, passing through the elongated holes, are used to slidably connect the column end plate to the upper chord of the roof truss.

[0008] Preferably, the shear-resistant component includes: At least one trapezoidal shear key is fixed to the upper surface of the upper chord of the roof truss; and, A shear groove matching the trapezoidal shear key is formed on the side of the column end plate and is used to accommodate the trapezoidal shear key.

[0009] Preferably, two trapezoidal shear keys are respectively provided on two opposite sides of the column end plate, and the two opposite trapezoidal shear keys have bearing inclined surfaces that incline inward toward each other, with an inclination angle of 5° to 10°.

[0010] Preferably, the distance between the center of the trapezoidal shear key and the center of the elongated hole is greater than 20 mm.

[0011] Preferably, the pressure-bearing inclined surface of the trapezoidal shear key and the corresponding contact area of ​​the shear groove are subjected to surface hardening treatment.

[0012] Preferably, the surface hardening treatment is a quenching treatment, and the hardness after treatment is HRC45-50.

[0013] Preferably, the coefficient of friction of the PTFE plate is not greater than 0.1, and the PTFE plate is provided with two layers.

[0014] Preferably, the length L of the oblong hole satisfies the formula: L≥2R+ΔL; where R is the radius of the bolt and ΔL is the maximum designed thermal expansion deformation of the upper chord of the roof truss.

[0015] Preferably, the width of the shear groove has a preset assembly gap with the thickness of the trapezoidal shear key after assembly.

[0016] The hinged sliding joint designed in this application for connecting the skylight frame column and the roof truss upper chord effectively allows the column end plate to slide horizontally relative to the roof truss upper chord through a sliding component, thereby releasing structural deformation caused by temperature changes. Simultaneously, the configured shear-resistant component reliably transmits the horizontal shear force between the column end plate and the roof truss upper chord while allowing this horizontal sliding. This joint effectively solves the contradiction in existing connection joints that cannot simultaneously coordinate temperature deformation and reliably transmit horizontal forces, improving the overall safety and functionality of the structure. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the planar structure of the hinged sliding node for connecting the skylight frame column and the upper chord of the roof truss, provided in an embodiment of this application.

[0018] Figure 2 This is a schematic diagram of the trapezoidal shear key provided in the embodiments of this application.

[0019] Figure 3 This is a schematic planar structure diagram from another perspective of the hinged sliding node for connecting the skylight frame column and the upper chord of the roof truss provided in the embodiments of this application.

[0020] Figure 4 This is a three-dimensional structural schematic diagram of the hinged sliding node for connecting the skylight frame column and the upper chord of the roof truss, provided in an embodiment of this application.

[0021] Figure 5 This is a schematic diagram of the anti-shear groove provided in an embodiment of this application.

[0022] The components include: 1. Skylight frame column; 2. Column end plate; 3. PTFE plate; 4. Roof truss upper chord; 5. Trapezoidal shear key; 6. Shear groove; 7. Oblong hole; and 8. Bolt. Detailed Implementation

[0023] The preferred embodiments of this application are described below with reference to the accompanying drawings. It should be understood that the preferred embodiments described herein are for illustration and explanation only and are not intended to limit this application.

[0024] like Figures 1 to 5 As shown in the illustration, the hinged sliding joint for connecting the skylight frame column and the roof truss upper chord described in this embodiment aims to solve the deformation and stress problems caused by temperature changes in large-span steel structures. Its main structure includes the roof truss upper chord 4, the column end plate 2 fixed to the bottom of the skylight frame column 1, and sliding and shear-resistant components disposed between the column end plate 2 and the roof truss upper chord 4. In this embodiment, the roof truss upper chord 4 serves as the basic load-bearing component of the joint, typically an H-beam or box girder, whose upper surface provides a platform for installing the joint. The column end plate 2 is a steel plate of predetermined thickness, firmly fixed to the bottom of the skylight frame column 1 by welding or other methods, used to transfer the load of the superstructure to the joint.

[0025] Specifically, a sliding assembly is disposed between the column end plate 2 and the roof truss upper chord 4, allowing the column end plate 2 to slide horizontally relative to the roof truss upper chord 4 to release temperature stress. Figure 4 As shown, the sliding component specifically includes: At least one PTFE plate 3 is disposed between the column end plate 2 and the upper chord 4 of the roof truss. PTFE (polytetrafluoroethylene) material has an extremely low coefficient of friction; in this embodiment, a PTFE plate with a coefficient of friction not greater than 0.1 is preferably used. To further improve sliding performance and durability, such as... Figure 4 As shown, two layers of PTFE boards 3 can be installed.

[0026] Elongated hole 7: It is opened on the column end plate 2, and its length direction is consistent with the transverse direction of the upper chord 4 of the roof truss, that is, consistent with the expected direction of thermal expansion and contraction.

[0027] Bolt 8: Passes through the elongated hole 7 and is used to slidably connect the column end plate 2 to the roof truss upper chord 4. That is, the bolt 8 passes through the elongated hole 7 on the column end plate 2 and is fastened to the roof truss upper chord 4. The shank of the bolt 8 can move freely within the length of the elongated hole 7, thus constituting the sliding stroke. In this embodiment, the bolt 8 mainly bears the vertical load and acts as a limiter for the column end plate 2, preventing it from slipping excessively or detaching.

[0028] To ensure sufficient slippage to fully release temperature deformation, the length L of the oblong hole 7 should satisfy the formula: L≥2R+ΔL, where R is the radius of the bolt 8, and ΔL is the design maximum thermal expansion deformation of the roof truss upper chord 4, which is the design maximum thermal expansion deformation of the roof truss upper chord 4 calculated based on the structural span, the material's linear expansion coefficient, and the region's maximum annual temperature difference. For example, if an M16 bolt (R=8mm) is used, and the calculated maximum thermal expansion deformation ΔL is 22mm, then the length L of the oblong hole should not be less than 2*8+22=38mm.

[0029] The shear-resistant assembly is used to transmit the horizontal shear force between the column end plate 2 and the roof truss upper chord 4, such as horizontal shear force caused by wind loads, seismic action, etc., while allowing the horizontal slippage. Figures 1 to 5 As shown, the shear-resistant component specifically includes: At least one trapezoidal shear key 5 is fixed to the upper surface of the upper chord 4 of the roof truss by means of welding or other methods.

[0030] Shear groove 6: It is formed on the side of the column end plate 2, and its shape, size and position match the trapezoidal shear key 5, and is used to accommodate the trapezoidal shear key 5 during installation.

[0031] In practical implementation, to achieve stable and symmetrical force transmission, such as Figure 4As shown, two trapezoidal shear keys 5 are respectively provided on two opposite sides of the column end plate 2, that is, four are provided in total. Simultaneously, the two opposite trapezoidal shear keys 5 have bearing inclined surfaces that slope inwards towards each other, with an inclination angle of 5° to 10°. This inclined surface design allows the bearing inclined surfaces of the trapezoidal shear keys 5 to decompose the horizontal shear force into a normal clamping force and a tangential force along the inclined surface when transmitting horizontal shear force, thereby enhancing node stability and generating a self-resetting tendency.

[0032] To facilitate installation and ensure smooth engagement between the shear key and the shear groove, the width of the shear groove 6 has a preset assembly gap, such as 2mm, between it and the thickness of the trapezoidal shear key 5 after assembly.

[0033] In some embodiments, to avoid adverse stress coupling between the bolt 8 and the shear key 5 during the sliding process, the distance between the center of the trapezoidal shear key 5 and the center of the elongated hole 7 is greater than 20mm, ensuring that the functions of each component are clear and the force path is well-defined.

[0034] In some embodiments, the bearing inclined surface of the trapezoidal shear key 5 and the corresponding contact area of ​​the shear groove 6 are subjected to surface hardening treatment. Specifically, the surface hardening treatment is a quenching treatment, and the hardness after treatment is HRC45-50, so as to effectively improve its wear resistance and fatigue resistance.

[0035] The hinged sliding joint provided in this application for connecting the skylight frame column and the roof truss upper chord, through the provided sliding component, effectively allows the column end plate to slide horizontally relative to the roof truss upper chord, thereby releasing structural deformation caused by temperature changes. Simultaneously, the configured shear-resistant component reliably transmits the horizontal shear force between the column end plate and the roof truss upper chord while allowing this horizontal sliding. This joint effectively solves the contradiction in existing connection joints that cannot simultaneously coordinate temperature deformation and reliably transmit horizontal forces, improving the overall safety and functionality of the structure.

[0036] In the description of this application, it should be noted that the terms "vertical", "up", "down", "horizontal", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0037] In the description of this application, it should also be noted that, unless otherwise expressly specified and limited, the terms "set," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0038] Finally, it should be noted that the above descriptions are merely preferred embodiments of this application and are not intended to limit this application. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A hinged sliding joint for connecting a skylight frame column to the upper chord of a roof truss, characterized in that, include: Upper chord of the roof frame (4); The column end plate (2) is fixed to the bottom end of the skylight frame column (1); A sliding component is disposed between the column end plate (2) and the roof truss upper chord (4) to enable the column end plate (2) to slide horizontally relative to the roof truss upper chord (4); as well as, Shear-resistant components are used to transmit the horizontal shear force between the column end plate (2) and the roof truss top chord (4) while allowing the horizontal slippage.

2. The hinged sliding joint for connecting the skylight frame column and the upper chord of the roof truss according to claim 1, characterized in that, The sliding component includes: At least one PTFE plate (3) is disposed between the column end plate (2) and the roof truss upper chord (4); An elongated hole (7) is provided on the end plate (2) of the column, the length of which is consistent with the transverse direction of the upper chord (4) of the roof truss; and, Bolts (8), passing through the elongated hole (7), are used to slidably connect the column end plate (2) to the roof truss upper chord (4).

3. The hinged sliding joint for connecting the skylight frame column and the upper chord of the roof truss according to claim 2, characterized in that, The shear-resistant component includes: At least one trapezoidal shear key (5) is fixed to the upper surface of the roof truss upper chord (4); and, A shear groove (6) matching the trapezoidal shear key (5) is provided on the side of the column end plate (2) and is used to accommodate the trapezoidal shear key (5).

4. The hinged sliding joint for connecting the skylight frame column and the upper chord of the roof truss according to claim 3, characterized in that, Two trapezoidal shear keys (5) are respectively provided on two opposite sides of the column end plate (2). The two trapezoidal shear keys (5) provided opposite to each other have pressure-bearing inclined surfaces that incline towards each other, and the inclination angle of the pressure-bearing inclined surfaces is 5° to 10°.

5. The hinged sliding joint for connecting the skylight frame column and the upper chord of the roof truss according to claim 3, characterized in that, The distance between the center of the trapezoidal shear key (5) and the center of the elongated hole (7) is greater than 20 mm.

6. The hinged sliding joint for connecting the skylight frame column and the upper chord of the roof truss according to claim 3, characterized in that, The pressure-bearing inclined surface of the trapezoidal shear key (5) and the corresponding contact area of ​​the shear groove (6) are subjected to surface hardening treatment.

7. The hinged sliding joint for connecting the skylight frame column and the upper chord of the roof truss according to claim 6, characterized in that, The surface hardening treatment is a quenching treatment, and the hardness after treatment is HRC45-50.

8. The hinged sliding joint for connecting the skylight frame column and the upper chord of the roof truss according to claim 2, characterized in that, The coefficient of friction of the PTFE plate (3) is not greater than 0.1, and the PTFE plate (3) is provided with two layers.

9. The hinged sliding joint for connecting the skylight frame column and the upper chord of the roof truss according to claim 2, characterized in that, The length L of the elongated hole (7) satisfies the formula: L≥2R+ΔL; where R is the radius of the bolt (8) and ΔL is the maximum thermal expansion deformation of the roof truss upper chord (4).

10. The hinged sliding joint for connecting the skylight frame column and the upper chord of the roof truss according to claim 3, characterized in that, The width of the shear groove (6) has a preset assembly gap with the thickness of the trapezoidal shear key (5) after assembly.

Images