A C-shaped continuous purlin closed continuous node structure

Abstract

The present invention discloses a C-shaped continuous purlin closed-end continuous node structure. The purlin support is welded to the steel beam flange and is used to fix the C-shaped purlin. The outer curled C-shaped cold-formed steel and the C-shaped purlin are nested with each other. The outer curled C-shaped cold-formed steel curling and the C-shaped purlin curling are mutually aligned and connected by self-tapping screws. The outer curled C-shaped cold-formed steel web and the C-shaped purlin web are mutually aligned or parallel to each other. The purlin support, the C-shaped purlin web and the outer curled C-shaped cold-formed steel web are connected by bolts. The C-shaped purlin web and the outer curled C-shaped cold-formed steel web can be connected by self-tapping screws or bolts. The present invention forms a closed cross-section by nesting and connecting the outer curled C-shaped cold-bent steel and the C-shaped purlin, which can effectively improve the bending and torsional rigidity of the connection section, ensure the continuity of the C-shaped purlin, realize the effective transmission of bending moment, and at the same time improve the stability of the C-shaped purlin. It is easy to process and install and has excellent performance.

Description

Technical Field

[0001] The invention belongs to the field of steel structure design, and particularly relates to a C-shaped continuous purlin closed continuous node structure. Background Art

[0002] Cold-formed, thin-walled, C-section steel purlins are widely used in steel structure factories to support roof or wall panels. For factories with large column spacing, simply supported purlins at both ends generate large bending moments at mid-span, necessitating purlins with larger cross-sections to meet stability and strength requirements. Connecting adjacent purlins to form continuous purlins effectively reduces the mid-span bending moments, achieving greater load-bearing capacity, stiffness, and cost-effectiveness. Cold-formed, obliquely curled, Z-section purlins are currently widely used because they can achieve a continuous effect through nesting. However, since C-section purlins cannot achieve a similar continuous effect, simply supported purlins are often used in practice.

[0003] In recent years, with the rise of the new energy industry, laying solar photovoltaic panels on the roofs of existing industrial plants has become an important implementation method. Since laying solar photovoltaic panels brings additional loads, the safety of the plant structure needs to be verified. In actual projects, it has been found that the roof purlins of a large number of industrial plants may have insufficient bearing capacity due to the effect of additional loads. In this case, the roof purlins need to be strengthened. One important method is to use a reasonable method to convert the simply supported purlins of the original structure into continuous purlins. For existing plant structures, the presence of color steel roof panels, tie rods and other structures on the upper flange of the purlins will bring many difficulties to the selection of reinforcement solutions. A method must be adopted that minimizes interference with the existing structure while achieving a continuous effect at the support. The existing continuous purlin connection structure usually adopts the method of nesting C-shaped cold-formed steel or L-shaped cold-formed steel with smaller cross-sectional specifications. However, since the cross-section of the internally nested cold-formed steel sections is small and is only connected to the web of the original section, the flange, which mainly contributes to the bending resistance of the section, cannot be continuous, resulting in insufficient bending stiffness of the connection section, making it impossible to achieve true continuity and effective transmission of bending moment, thus posing a hidden danger to the safety of the structure.

[0004] Furthermore, in the positive bending moment area of ​​the purlin, due to the effects of additional loads (such as photovoltaic panels, increased snow loads, etc.), the bending and torsion of the cross section may be aggravated, resulting in insufficient cross-sectional bearing capacity. Therefore, it is necessary to strengthen the bending and torsion resistance of the purlin through reinforcement. Summary of the Invention

[0005] To address the problems presented in the prior art, the present invention aims to provide a C-shaped continuous purlin closed-end continuous node structure that not only effectively improves the bending resistance of the connecting section, but also enhances its torsional rigidity and stability, thereby ensuring connection reliability and effective transmission of bending moments. This structure also offers the advantages of minimal interference with existing structures and ease of construction. Furthermore, this structure can also serve as a method for enhancing the bending and torsional resistance of C-shaped purlins.

[0006] The technical solutions adopted in the present invention are as follows:

[0007] The present invention includes purlins connected end to end, and a purlin support and a cold-bent steel are fixedly installed at the connection between each two adjacent purlins, and the purlin support and the cold-bent steel are respectively located on both sides of the purlin web. The butt joint of the two adjacent purlins is connected to the upper surface of the steel beam through the purlin support, and the purlin support is fixedly connected to the upper surface of the steel beam; at the connection between the two adjacent purlins, the cold-bent steel and the curled edge of the purlin are fitted together, and the cold-bent steel and the purlin can be fitted together or not, and after the cold-bent steel and the purlin are connected, a closed integrated structure is formed, that is, a closed cross-section.

[0008] The purlin and cold-formed steel are respectively C-shaped purlins and C-shaped cold-formed steel with outer curling edges. The purlin includes a first web, two first flanges and two first curling edges. The two ends of the first web are respectively connected to the two first flanges, and the two first flanges are respectively connected to the two first curling edges. The first web and the first flanges are perpendicular to each other, and the first flanges and the first curling edges are perpendicular to each other, that is, the first web and the first curling edges are arranged parallel and spaced apart. In the purlin, the first curling edge is bent toward the inner side of the first flange to form a C-shaped structure.

[0009] The cold-formed steel comprises a second web, two second flanges, and two second curling edges. The two ends of the second web are respectively connected to the two second flanges, and the two second flanges are respectively connected to the two second curling edges. The second web and the second flanges are perpendicular to each other, and the second flanges and the first curling edges are perpendicular to each other, that is, the second web and the second curling edges are arranged parallel and spaced apart. In the cold-formed steel, the second curling edges are bent toward the outside of the second flanges to form a "J"-shaped structure.

[0010] The inner side of the first / second flange plate is the side close to the other first / second flange plate, and the outer side of the first / second flange plate is the side away from the other first / second flange plate.

[0011] At the connection between two adjacent purlins, the cold-formed steel is arranged at the opening of the purlin, and the first curled edge of the purlin and the second curled edge of the cold-formed steel are fixedly connected by a first self-tapping screw, so that the cold-formed steel and the purlin are connected to form a closed cross-section structure.

[0012] At the connection between two adjacent purlins, the connection methods of the purlin and the cold-formed steel include two connection methods: web-fitting connection and web-non-fitting connection; when the purlin and the cold-formed steel adopt the web-fitting connection method, the first web of the purlin and the second web of the cold-formed steel are fixedly connected, and there is no gap between the first web and the second web; when the purlin and the cold-formed steel adopt the web-non-fitting connection method, there is no contact between the first web of the purlin and the cold-formed steel, and a gap exists.

[0013] The purlin support includes a purlin support plate and stiffening ribs. The stiffening ribs are vertically welded to the purlin support plate. The first webs of two adjacent purlins are connected to the purlin support plate at the joint, and the purlin support plate is parallel to the first webs of the purlins. The bottom ends of the purlin support plate and the stiffening ribs are fixedly connected to the upper surface of the steel beam.

[0014] Specifically, there is a gap between the lower surface of the purlin 2 and the upper surface of the steel beam 1. At the location where the purlin bracket 4 is provided, when the C-shaped purlin 2 and the outer-curled C-shaped cold-formed steel 3 are connected by web-fitting, the purlin bracket, the first web of the C-shaped purlin 2, and the second web of the outer-curled C-shaped cold-formed steel 3 can be fixedly connected together by connecting bolts 5. At the location where the purlin bracket 4 is not provided, the first web of the C-shaped purlin 2 and the second web of the outer-curled C-shaped cold-formed steel 3 can be connected together by second self-tapping screws 7.

[0015] The non-connected parts of the purlins are provided with cold-bent steels for cross-section reinforcement. The cold-bent steels for cross-section reinforcement are installed at positions in the purlins where the bending bearing capacity does not meet the design requirements of the specifications.

[0016] At the non-connected parts of the purlins, the connection methods of the purlins and the cold-formed steels include two connection methods: web-fitting connection and web-non-fitting connection; when the purlins and the cold-formed steels adopt the web-fitting connection method, the first web of the purlin and the second web of the cold-formed steel are fixedly connected by second self-tapping screws, and there is no gap between the first web and the second web; when the purlins and the cold-formed steels adopt the web-non-fitting connection method, there is no contact between the first web of the purlin and the cold-formed steel, and a cavity is formed.

[0017] At the connection between two adjacent purlins, the wall thickness of the cold-formed steel is not less than the wall thickness of the purlin, the width of the second flange plate of the cold-formed steel is not greater than the width of the first flange plate of the purlin, and the width of the first web in the purlin is slightly greater than the width of the second web in the cold-formed steel.

[0018] The first web in the purlin is parallel to the second web in the cold-formed steel, the first flange in the purlin is parallel to the second flange in the cold-formed steel, and the first flange does not contact the second flange.

[0019] The length of the cold-bent steel is not less than 4 times the cross-sectional height of the purlin and is the same as the connection length of the left and right purlins.

[0020] The present invention adopts an outer-curled C-shaped cold-formed steel and a nested connection with the C-shaped purlin at the connection point of two purlins or the area requiring reinforcement, wherein the web of the outer-curled C-shaped cold-formed steel is in contact with the web of the C-shaped purlin or is spaced parallel to each other, and the curling of the outer-curled C-shaped cold-formed steel is in contact with the curling of the C-shaped purlin.

[0021] In the nested section, when the outer-curled C-shaped cold-formed steel and the web of the C-shaped purlin fit together, the purlin support plate, C-shaped purlin web, and outer-curled C-shaped cold-formed steel web at the support are fixedly connected by connecting bolts; the C-shaped purlin web and the outer-curled C-shaped cold-formed steel web in the nested section can be connected by self-tapping screws or connecting bolts. When the outer-curled C-shaped cold-formed steel and the web of the C-shaped purlin are parallel to each other but at a certain distance and do not fit together, the bolt connection between the purlin support plate and the C-shaped purlin web is retained at the support, and the outer-curled C-shaped cold-formed steel and the C-shaped purlin are connected by self-tapping screws on the curled edges of the two. When used for reinforcement at non-support locations, the outer-curled C-shaped cold-formed steel and the C-shaped purlin are connected by self-tapping screws on the curled edges of the two. When the webs of the two fit together, the webs can also be connected by self-tapping screws or connecting bolts.

[0022] The distance between the two flanges of the externally curled C-shaped cold-formed steel is less than the distance between the two flanges of the C-shaped purlin minus twice the height of the curling, which allows the web of the externally curled C-shaped cold-formed steel to be embedded in the cavity of the C-shaped purlin. The flange width of the externally curled C-shaped cold-formed steel is not greater than the flange width of the C-shaped purlin. The total cross-sectional height of the externally curled C-shaped cold-formed steel, that is, the sum of the flange distance and the height of the two curling flanges, is approximately equal to the cross-sectional height of the C-shaped purlin. When used in continuous nodes, the length of the externally curled C-shaped cold-formed steel shall not be less than four times the cross-sectional height of the C-shaped purlin, and shall be arranged symmetrically on both sides with the support as the center; when used for reinforcement in other locations, the length of the externally curled C-shaped cold-formed steel can be determined based on actual calculations. The number of connecting bolts and self-tapping screws between the externally curled C-shaped cold-formed steel and the C-shaped purlin can be determined based on shear bearing capacity calculations.

[0023] The design principle of the present invention is:

[0024] By nesting and connecting the outer curled C-shaped cold-bent steel and the C-shaped purlin, a closed section is formed in the nested section, which can not only effectively improve the bending stiffness of the connection section, but also form a continuity between the original two simply supported C-shaped purlins on both sides of the support, thereby realizing the effective transmission of bending moment. At the same time, the closed section formed can greatly improve (hundreds of times) the torsional stiffness of the connection section and improve the stability of the purlin. When the bending strength or stability of the C-shaped purlin is insufficient due to additional loads or changes in calculation conditions, the method of the present invention can also be used for strengthening. The outer curled C-shaped cold-bent steel section used in the present invention is a universal section form, which is easy to purchase. When constructing on the existing structure, the connection between the original purlin and the roof color steel plate will not be affected; when the outer edge C-shaped cold-formed steel and the web of the C-shaped purlin fit together, it is only necessary to unscrew the nuts of the bolts at the original purlin support and retighten them after the outer edge C-shaped cold-formed steel is in place; when the outer edge C-shaped cold-formed steel and the web of the C-shaped purlin are parallel but not fitting together, there is no need to process the original bolt connection at the purlin support, and the self-tapping screws at the curling edges of the outer edge C-shaped cold-formed steel and the C-shaped purlin support can be directly connected. In addition, the fit of the plates when the outer edge C-shaped cold-formed steel and the C-shaped purlin are nested can improve the local stability of the cross-section plates of the nested connection section. By using bolts and self-tapping screws on the web and curling edges, the reliability of the nested connection between the outer edge C-shaped cold-formed steel and the C-shaped purlin can be guaranteed.

[0025] The beneficial effects of the present invention are:

[0026] 1. The C-shaped continuous purlin connection structure proposed in the present invention forms a closed cross-section in the nested connection section. Through the combined effect between the externally curled C-shaped cold-formed steel and the C-shaped purlin, sufficient bending strength and rigidity can be obtained, achieving the continuity condition between the simply supported purlins on both sides of the support;

[0027] 2. The closed section formed by the nested connection of the outer curled C-shaped cold-formed steel and the C-shaped purlin proposed in the present invention, the two flanges of the outer curled C-shaped cold-formed steel can jointly withstand the bending moment with the flanges of the C-shaped purlin section, greatly improving the bending resistance of the section.

[0028] 3. The closed section formed by the nested connection of the C-shaped cold-formed steel and C-shaped purlins proposed in the present invention has excellent torsional resistance, effectively solving the problem of insufficient torsional resistance of the C-shaped open section, and can greatly improve the overall stability of the purlin when the lower flange is under pressure and the critical load of distortional buckling of the section.

[0029] 4. Compared with ordinary C-shaped purlins, the closed section formed by nested connection of the C-shaped cold-formed steel with external curling and the C-shaped purlins proposed in the present invention has higher out-of-plane (around the weak axis of the section) bending strength and stiffness, which can make the purlin have better out-of-plane bending performance under the action of wind suction, smaller out-of-plane deformation of the lower flange, and better overall stability.

[0030] 5. The C-shaped continuous purlin connection structure proposed in the present invention can improve the local stability of the nested connection section cross-section plate.

[0031] 6. The C-shaped continuous purlin connection structure proposed in the present invention can be used as a measure to strengthen the bending strength and stability of the C-shaped purlin, and can significantly improve the bending and torsional properties of the C-shaped purlin, thereby improving the strength and stability.

[0032] 7. The C-shaped continuous purlin connection structure proposed in the present invention uses an externally curled C-shaped cold-formed steel section with a commonly used cross-section, which is easy to purchase, has little interference with the existing structure, and is easy to install and construct. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 This is the axonometric drawing of the C-shaped continuous purlin connection structure;

[0034] Figure 2 It is a side view of the C-shaped continuous purlin connection structure;

[0035] Figure 3 This is a front view of the C-shaped continuous purlin connection structure;

[0036] Figure 4 This is the rear view of the C-shaped continuous purlin connection structure;

[0037] Figure 5 This is a disassembled diagram of the C-shaped continuous purlin connection structure;

[0038] Figure 6 This is a side view of the C-shaped continuous purlin connection structure (the webs of the nested sections are not attached);

[0039] Figure 7 This is a front view of the C-shaped continuous purlin connection structure (the webs of the nested sections are not attached);

[0040] Figure 8 This is the rear view of the C-shaped continuous purlin connection structure (the webs of the nested sections are not attached);

[0041] Figure 9 This is a disassembled diagram of the C-shaped continuous purlin connection structure (the webs of the nested sections are not attached);

[0042] Figure 10 This is a disassembled diagram of the C-shaped continuous purlin connection structure used for local reinforcement;

[0043] Figure 11 This is a side view of a C-shaped continuous purlin connection structure used for local reinforcement;

[0044] Figure 12 This is a disassembled diagram of a C-shaped continuous purlin connection structure used for local reinforcement (the webs of the nested sections are not attached);

[0045] Figure 13 This is a side view of a C-shaped continuous purlin connection structure used for local reinforcement (the webs of the nested sections are not attached);

[0046] In the figure: 1. Steel beam; 2. Purlin; 3. Cold-formed steel; 4. Purlin support; 5. Connecting bolt; 6. First self-tapping screw; 7. Second self-tapping screw. DETAILED DESCRIPTION

[0047] The present invention is described in detail below with reference to specific implementation cases. The following implementation cases will help those skilled in the art to further understand the present invention, but do not limit the present invention in any form.

[0048] like Figure 1 As shown, the node structure includes purlins 2 connected end to end, and a purlin support 4 and a cold-formed steel 3 are fixedly installed at the connection between each two adjacent purlins 2, and the purlin support 4 and the cold-formed steel 3 are respectively located on both sides of the web of the purlin 2. The butt joint of two adjacent purlins 2 is connected to the upper surface of the steel beam 1 through the purlin support 4, and the purlin support 4 is fixedly connected to the upper surface of the steel beam 1; at the connection between two adjacent purlins 2, the cold-formed steel 3 is fitted with the curled edge of the purlin 2, and the cold-formed steel 3 and the purlin 2 can be fitted or not fitted, and after the cold-formed steel 3 and the purlin 2 are connected, a closed integrated structure is formed. That is, a closed section.

[0049] like Figure 2-Figure 5 As shown, the purlin 2 and the cold-formed steel 3 respectively adopt C-shaped purlins and C-shaped cold-formed steel with external curling edges. The purlin 2 includes a first web, two first flanges and two first curling edges. The two ends of the first web are respectively connected to the two first flanges, and the two first flanges are respectively connected to the two first curling edges. The first web and the first flanges are perpendicular to each other, and the first flanges and the first curling edges are perpendicular to each other, that is, the first web and the first curling edges are arranged parallel and spaced apart. In the purlin 2, the first curling edge is bent toward the inner side of the first flange to form a C-shaped structure.

[0050] The cold-formed steel 3 includes a second web, two second flanges, and two second curling edges. The two ends of the second web are respectively connected to the two second flanges, and the two second flanges are respectively connected to the two second curling edges. The second web and the second flanges are perpendicular to each other, and the second flanges and the first curling edges are perpendicular to each other, that is, the second web and the second curling edges are arranged parallel and spaced apart. In the cold-formed steel 3, the second curling edges are bent toward the outside of the second flanges to form a "J"-shaped structure.

[0051] The inner side of the first / second flange plate is the side close to the other first / second flange plate, and the outer side of the first / second flange plate is the side away from the other first / second flange plate.

[0052] At the connection between two adjacent purlins 2, the cold-formed steel 3 is arranged at the opening of the purlin 2, and the first curled edge of the purlin 2 and the second curled edge of the cold-formed steel 3 are fixedly connected by a first self-tapping screw 6, so that the cold-formed steel 3 and the purlin 2 are connected to form a closed cross-section structure.

[0053] At the connection of two adjacent purlins 2, the connection modes of the purlin 2 and the cold-formed steel 3 include two connection modes: web-fitting connection and web-non-fitting connection. When the purlin 2 and the cold-formed steel 3 adopt the web-fitting connection mode, the first web of the purlin 2 and the second web of the cold-formed steel 3 are fixedly connected, and there is no gap between the first web and the second web. Figure 2 and Figure 5 When the purlin 2 and the cold-formed steel 3 are connected by a web-unfitting connection, the first web of the purlin 2 and the cold-formed steel 3 are not in contact, and there is a gap, such as Figure 6-Figure 9 shown.

[0054] The purlin support 4 includes a purlin support plate and stiffening ribs. The stiffening ribs are vertically welded to the purlin support plate. The first webs of two adjacent purlins 2 are connected to the purlin support plate at the joint, and the purlin support plate is parallel to the first web of the purlin 2. The bottom ends of the purlin support plate and the stiffening ribs are fixedly connected to the upper surface of the steel beam 1.

[0055] Specifically, there is a gap between the lower surface of the purlin 2 and the upper surface of the steel beam 1. At the location where the purlin bracket 4 is provided, when the C-shaped purlin 2 and the outer-curled C-shaped cold-formed steel 3 are connected by web-fitting, the purlin bracket, the first web of the C-shaped purlin 2, and the second web of the outer-curled C-shaped cold-formed steel 3 can be fixedly connected together by connecting bolts 5. At the location where the purlin bracket 4 is not provided, the first web of the C-shaped purlin 2 and the second web of the outer-curled C-shaped cold-formed steel 3 can be connected together by second self-tapping screws 7.

[0056] The non-connected parts of the purlin 2 are provided with cold-formed steel 3 for cross-section reinforcement. The cross-section reinforced cold-formed steel 3 is installed at the position of the purlin 2 where the bending bearing capacity does not meet the design requirements of the specification.

[0057] At the non-connected part of the purlin 2, the connection mode between the purlin 2 and the cold-formed steel 3 includes two connection modes: web fitting connection and web non-fitting connection; when the purlin 2 and the cold-formed steel 3 adopt the web fitting connection mode, the first web of the purlin 2 and the second web of the cold-formed steel 3 are fixedly connected by the second self-tapping screws 7, and there is no gap between the first web and the second web, such as Figure 10 and Figure 11 When the purlin 2 and the cold-formed steel 3 are connected in a manner that the webs do not fit together, the first web of the purlin 2 and the cold-formed steel 3 are not in contact with each other and a cavity is formed, as shown. Figure 12-13 shown.

[0058] At the connection between two adjacent purlins 2, the wall thickness of the cold-formed steel 3 is not less than the wall thickness of the purlin 2, the width of the second flange plate of the cold-formed steel 3 is not greater than the width of the first flange plate of the purlin 2, and the width of the first web in the purlin 2 is slightly greater than the width of the second web in the cold-formed steel 3.

[0059] The first web of the purlin 2 is parallel to the second web of the cold-formed steel 3 , the first flange of the purlin 2 is parallel to the second flange of the cold-formed steel 3 , and the first flange does not contact the second flange.

[0060] The length of the cold-bent steel 3 is not less than 4 times the cross-sectional height of the purlin 2 and is the same as the connection length of the left and right purlins 2.

[0061] The first embodiment of the present invention is as follows:

[0062] like Figure 1 and Figure 2 As shown, the C-shaped continuous purlin closed continuous node structure of the embodiment includes a steel beam 1, a C-shaped purlin 2, an outer curled C-shaped cold-formed steel 3 and a purlin support 4. The purlin support 4 is fixed to the upper flange of the steel beam 1 by welding (or bolt connection). The two simply supported C-shaped purlins 2 are connected to the purlin support 4 by bolts 5 to form a simply supported connection structure. The outer curled C-shaped cold-formed steel 3 is nested and connected with the two simply supported C-shaped purlins 2, and the webs and curls of the two are respectively fitted with each other, wherein the purlin support 4, the C-shaped purlin 2 and the webs of the outer curled C-shaped cold-formed steel 3 are connected by bolts 5; the curls of the C-shaped purlin 2 and the outer curled C-shaped cold-formed steel 3 are connected by self-tapping screws 6; the web fitting parts of the C-shaped purlin 2 and the outer curled C-shaped cold-formed steel 3 outside the purlin support 4 are connected by self-tapping screws 7 (or bolts), as shown. Figure 2-Figure 4 shown. Figure 5 The disassembly diagram of the closed continuous node structure of the C-shaped continuous purlin is given in the figure. The length of the outer curled C-shaped cold-formed steel 3 is not less than 4 times the cross-sectional height of the C-shaped purlin 2, and the connection length of the outer curled C-shaped cold-formed steel 3 and the left and right sections of the C-shaped purlin 2 are the same. Figure 2 As shown, the wall thickness of the outer-curled C-shaped cold-formed steel section 3 is not less than the wall thickness of the C-shaped purlin 2. The web height of the outer-curled C-shaped cold-formed steel section 3 is less than the cross-sectional height of the C-shaped purlin 2 minus the height of the two curled edges; the total cross-sectional height of the outer-curled C-shaped cold-formed steel section 3 is similar to the cross-sectional height of the C-shaped purlin 2; and the flange width of the outer-curled C-shaped cold-formed steel section 3 is close to the flange width of the C-shaped purlin 2.

[0063] The second embodiment of the present invention is as follows:

[0064] like Figure 6As shown, the C-shaped continuous purlin closed continuous node structure of the embodiment includes a steel beam 1, a C-shaped purlin 2, an outer curled C-shaped cold-formed steel 3 and a purlin support 4. The purlin support 4 is fixed to the upper flange of the steel beam 1 by welding (or bolt connection). Two simply supported C-shaped purlins 2 are connected to the purlin support 4 by bolts 5 to form a simply supported connection structure. The two C-shaped purlins 2 are nested and connected to the outer curled C-shaped cold-formed steel 3, and the curling edges of the two fit together, and the webs are parallel to each other, wherein the purlin support 4 and the web of the C-shaped purlin 2 are connected by bolts 5, and the curling edges of the C-shaped purlin 2 and the outer curled C-shaped cold-formed steel 3 are connected by self-tapping screws 6. Figure 6-Figure 8 shown. Figure 9 The disassembly diagram of the closed continuous node structure of the C-shaped continuous purlin is given in the figure. The length of the outer curled C-shaped cold-formed steel 3 is not less than 4 times the cross-sectional height of the C-shaped purlin 2, and the connection length of the outer curled C-shaped cold-formed steel 3 and the left and right C-shaped purlins 2 is the same. Figure 2 As shown, the wall thickness of the outer-curled C-shaped cold-formed steel 3 is not less than the wall thickness of the C-shaped purlin 2. The web height of the outer-curled C-shaped cold-formed steel 3 is less than the cross-sectional height of the C-shaped purlin 2 minus the height of the two curled edges; the total cross-sectional height of the outer-curled C-shaped cold-formed steel 3 is similar to the cross-sectional height of the C-shaped purlin 2; and the flange width of the outer-curled C-shaped cold-formed steel 3 is less than the flange width of the C-shaped purlin 2.

[0065] The third embodiment of the present invention is as follows:

[0066] The connection structure of the present invention can also be used to strengthen the cross section of C-shaped purlins at locations with large bending moments. Figure 10 As shown, the C-shaped purlin 2 and the outer curled C-shaped cold-formed steel 3 are nested and connected, and the curled edges and webs of the two are respectively fitted with each other. The curled edges of the two are connected by self-tapping screws 6, and the webs are connected by self-tapping screws 7 (or bolts). Figure 11 shown.

[0067] The fourth embodiment of the present invention is as follows:

[0068] The connection structure of the present invention can also be used to strengthen the cross section of C-shaped purlins at locations with large bending moments. Figure 12 As shown, the C-shaped purlin 2 and the outer curled C-shaped cold-formed steel 3 are nested and connected, the curled edges of the two are in contact with each other, and the webs are parallel to each other and do not touch. The curled edges of the two are connected by self-tapping screws 6, as shown in FIG. Figure 13 shown.

[0069] The present invention proposes a C-shaped continuous purlin closed continuous node structure suitable for the purlin system. The outer curled C-shaped cold-bent steel is nested and connected with the C-shaped purlin to form a closed section, which can not only effectively improve the bending stiffness of the connection section, but also improve the torsional stiffness, thereby ensuring the continuity of the C-shaped purlin and realizing the effective transmission of the bending moment. The structure proposed by the present invention can also be used for local reinforcement of the purlin where the bending moment is large, which can improve the bending and torsional performance of the cross-section and improve the stability under wind suction; the outer curled C-shaped cold-bent steel used in the present invention is a commonly used cross-section form, which is easy to manufacture, simple in structure, and has little interference with the original structure during the installation process, and is easy to install.

[0070] The embodiments of the present invention do not impose any form of limitation on this aspect. Any technician familiar with this profession can use the technical content disclosed above to make some more or modify them into equivalent embodiments with equivalent changes without departing from the scope of the technical solution of this aspect. However, any simple modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of this aspect without departing from the content of the technical solution of the present invention are still within the scope of the technical solution of this aspect.

Claims

1. A C-shaped continuous purlin closed continuous node structure, characterized by: The invention comprises purlins (2) connected end to end, wherein a purlin support (4) and a cold-bent steel (3) are fixedly installed at the connection between each two adjacent purlins (2), and the purlin support (4) and the cold-bent steel (3) are respectively located on both sides of the web of the purlin (2), and the butt joint of the two adjacent purlins (2) is connected to the upper surface of the steel beam (1) through the purlin support (4), and the purlin support (4) is fixedly connected to the upper surface of the steel beam (1); at the connection between the two adjacent purlins (2), the cold-bent steel (3) and the purlin (2) are fitted together, and the cold-bent steel (3) and the purlin (2) are connected to form a closed integrated structure; The purlin (2) and cold-formed steel (3) are respectively C-shaped purlin and C-shaped cold-formed steel with outer curling edges. The purlin (2) includes a first web, two first flanges and two first curling edges. The two ends of the first web are respectively connected to the two first flanges. The two first flanges are respectively connected to the two first curling edges. The first web and the first flange are perpendicular to each other. The first flange and the first curling edge are perpendicular to each other. In the purlin (2), the first curling edge is bent toward the inner side of the first flange to form a C-shaped structure. The cold-formed steel section (3) comprises a second web, two second flanges and two second curling edges, the two ends of the second web are respectively connected to the two second flanges, the two second flanges are respectively connected to the two second curling edges, the second web and the second flanges are perpendicular to each other, and the second flanges and the first curling edges are perpendicular to each other, and in the cold-formed steel section (3), the second curling edges are bent toward the outside of the second flanges to form a "J"-shaped structure; At the connection between two adjacent purlins (2), the cold-bent steel (3) is arranged at the opening of the purlin (2), and the first rolled edge of the purlin (2) and the second rolled edge of the cold-bent steel (3) are fixedly connected by a first self-tapping screw (6), so that the cold-bent steel (3) and the purlin (2) are connected to form a closed cross-section structure; At the connection between two adjacent purlins (2), the connection mode of the purlin (2) and the cold-formed steel (3) includes two connection modes: a web-fit connection and a web-non-fit connection; when the purlin (2) and the cold-formed steel (3) adopt the web-fit connection mode, the first web of the purlin (2) and the second web of the cold-formed steel (3) are fixedly connected, and there is no gap between the first web and the second web; when the purlin (2) and the cold-formed steel (3) adopt the web-non-fit connection mode, there is no contact between the first web of the purlin (2) and the cold-formed steel (3), and there is a gap; The first web in the purlin (2) and the second web in the cold-formed steel (3) are parallel, the first flange in the purlin (2) and the second flange in the cold-formed steel (3) are parallel, and the first flange does not contact the second flange.

2. The C-shaped continuous purlin closed continuous node structure according to claim 1, characterized in that: The purlin support (4) includes a purlin support plate and stiffening ribs, the stiffening ribs are vertically welded to the purlin support plate, the first webs of two adjacent purlins (2) are connected to the purlin support plate, and the purlin support plate is parallel to the first webs of the purlins (2), and the bottom ends of the purlin support plate and the stiffening ribs are fixedly connected to the upper surface of the steel beam (1).

3. The C-shaped continuous purlin closed continuous node structure according to claim 1, characterized in that: Cold-bent steel sections (3) for cross-section reinforcement are provided at non-connected portions of the purlins (2); the cross-section-reinforced cold-bent steel sections (3) are installed at positions in the purlins (2) where the bending bearing capacity does not meet the design requirements of the specification.

4. The C-shaped continuous purlin closed continuous node structure according to claim 3, characterized in that: At the non-connected portion of the purlin (2), the connection mode of the purlin (2) and the cold-formed steel (3) includes two connection modes: a web-fitting connection and a web-non-fitting connection; when the purlin (2) and the cold-formed steel (3) adopt the web-fitting connection mode, the first web of the purlin (2) and the second web of the cold-formed steel (3) are fixedly connected by the second self-tapping screw (7), and no gap exists between the first web and the second web; when the purlin (2) and the cold-formed steel (3) adopt the web-non-fitting connection mode, the first web of the purlin (2) and the cold-formed steel (3) do not contact each other, and a cavity is formed.

5. The C-shaped continuous purlin closed continuous node structure according to claim 1, characterized in that: At the connection between two adjacent purlins (2), the wall thickness of the cold-formed steel (3) is not less than the wall thickness of the purlin (2), the width of the second flange plate of the cold-formed steel (3) is not greater than the width of the first flange plate of the purlin (2), and the width of the first web in the purlin (2) is greater than the width of the second web in the cold-formed steel (3).

6. The C-shaped continuous purlin closed continuous node structure according to claim 1, characterized in that: The length of the cold-bent steel (3) is not less than four times the cross-sectional height of the purlin (2).

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