A steel frame - cold - formed thin - walled steel shear wall

Abstract

The present invention relates to a steel frame - cold - formed thin - walled steel shear wall, which includes a steel frame. Inside the frame of the steel frame, cold - formed thin - walled steel keels are installed, and keel node reinforcement devices are arranged at the nodes of the cold - formed thin - walled steel keels. This steel frame - cold - formed thin - walled steel shear wall is formed by embedding cold - formed thin - walled steel keels into the steel frame, belonging to a new type of steel frame - shear wall structure. Through the keel node reinforcement device, the overall stiffness of the cold - formed thin - walled steel wall is improved, enabling the two to work well in coordination, effectively improving the ductility, ultimate deformation capacity and energy - dissipation capacity of the wall, and moreover, it can delay the stiffness degradation and reduce the bearing - capacity loss after the peak point.

Description

Technical Field

[0001] The present invention relates to a steel frame - cold - formed thin - walled steel shear wall, and relates to the field of civil engineering. Background Art

[0002] It is an irresistible trend that the construction industry mainly based on traditional cast - in - place concrete structures transforms into green buildings mainly based on prefabricated structures.

[0003] In the steel frame - shear wall system, the shear wall, as the main energy - dissipating component, can ensure the safety of the main structure. For the steel frame - concrete shear wall structure, there is a large difference in stiffness and ductility between the two, and their collaborative work is not good. For the steel frame - steel plate shear wall structure, due to the relatively large stiffness of the shear wall, the frame columns are prone to fail earlier, resulting in the shear wall being unable to fully play its energy - dissipating role. Summary of the Invention

[0004] In view of the deficiencies of the prior art, the technical problem to be solved by the present invention is to provide a steel frame - cold - formed thin - walled steel shear wall.

[0005] To solve the above - mentioned technical problem, the technical solution of the present invention is: a steel frame - cold - formed thin - walled steel shear wall, including a steel frame, in which cold - formed thin - walled steel keels are installed inside the frame of the steel frame, and keel node reinforcement devices are arranged at the nodes of the cold - formed thin - walled steel keels.

[0006] Preferably, the keel node reinforcement devices are all installed between adjacent members in each grid of the cold - formed thin - walled steel keels.

[0007] Preferably, the keel node reinforcement devices all adopt telescopic support components.

[0008] Preferably, the steel frame is formed by connecting two frame columns and one frame beam. The connection between the frame beam and the frame column adopts an end - plate connection node, and the end - plate connection node is that the end - plate welded at the end of one component is connected to the end - plate or column flange of another component through high - strength bolts.

[0009] Preferably, the cold - formed thin - walled steel keel is formed by connecting several horizontally distributed columns, several vertically distributed rigid cross - braces, an upper guide rail, a lower guide rail, and several rigid diagonal braces through self - tapping bolt - nut assemblies. Openings are provided at the positions where the cross - brace webs of the rigid cross - braces pass through the columns for the columns to pass through longitudinally. The rigid diagonal braces are all arranged in each grid of the cold - formed thin - walled steel keel. The rigid diagonal braces in adjacent horizontal grids are integrally distributed in a herringbone pattern. The rigid diagonal braces are connected to the columns and rigid cross - braces through gusset plates and self - tapping bolt - nut assemblies.

[0010] Preferably, keel node reinforcement devices are arranged between the columns and the upper guide rail, between the columns and the lower guide rail, between the columns and the rigid diagonal braces, and between the rigid diagonal braces and the rigid cross - braces.

[0011] Preferably, each of the keel node reinforcement devices includes a main pipe body, two threaded rods, and two rotary shaft type hinge positioners. The inner ends of the threaded rods are coaxially threadedly connected to the same end side of the main pipe body, and the rotary shaft type hinge positioners are all installed at the outer ends of the threaded rods on the same side.

[0012] Preferably, each of the rotary shaft type hinge positioners includes a fixed end support and a rotary shaft rod. The fixed end support is symmetrically provided with through holes along the radial direction. One end of the rotary shaft rod is provided with a connecting rod, and the connecting rod is coaxially installed and connected to the through hole. The other end of the rotary shaft rod is threadedly connected to the outer end of the threaded rod on the same side, and the fixed end support is welded to the cold-formed thin-walled steel keel.

[0013] Preferably, each of the self-tapping bolt and nut assemblies includes a drilled bolt and a grooved nut. The drilled bolt includes a bolt head, a main body rod section, a transition rod section, and a self-drilling pointed tail coaxially and fixedly arranged from top to bottom. The self-drilling pointed tail includes two cutting edges. The cylindrical wall of the cylindrical opening of the grooved nut is formed with a thread, and the thread is threadedly engaged with the thread of the main body rod section of the drilled bolt.

[0014] Preferably, the bolt head is an external hexagonal bolt head, and the top surface of the bolt head is provided with an internal hexagonal notch. The bottom surface of the internal hexagonal notch is provided with a tool groove, and the tool groove is a straight groove and a hexagonal groove.

[0015] Compared with the prior art, the present invention has the following beneficial effects: The steel frame - cold-formed thin-walled steel shear wall is formed by embedding the cold-formed thin-walled steel keel into the steel frame, belonging to a new type of steel frame - shear wall structure. The overall stiffness of the cold-formed thin-walled steel wall is improved through the keel node reinforcement device, enabling the two to work well together, effectively improving the ductility, ultimate deformation capacity, and energy dissipation capacity of the wall, and moreover, it can delay the stiffness degradation and reduce the bearing capacity loss after the peak point.

[0016] The following further describes the present invention in detail with reference to the accompanying drawings and specific embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic structural diagram of an embodiment of the present invention.

[0018] Figure 2 It is a schematic structural diagram of the steel frame.

[0019] Figure 3 It is a schematic structural diagram of the cold-formed thin-walled steel keel.

[0020] Figure 4 It is a schematic structural diagram of the keel node reinforcement device.

[0021] Figure 5 It is a schematic structural diagram of the drilled boltFigure 1 .

[0022] Figure 6 Schematic structure of a drilled bolt Figure 2 .

[0023] Figure 7 Schematic structure diagram of a slotted nut

[0024] Figure 8 Top view of a bolt head

[0025] In the figure:

[0026] 1 - steel frame, 11 - frame column, 12 - frame beam;

[0027] 2 - cold-formed thin-walled steel keel, 21 - column, 22 - rigid cross brace, 231 - upper guide rail, 232 - lower guide rail, 24 - rigid diagonal brace, 25 - gusset plate;

[0028] 3 - keel joint reinforcement device, 31 - main pipe body, 32 - threaded rod, 331 - fixed end support, 332 - rotating shaft member, 34 - limit bolt;

[0029] 4 - self-tapping bolt and nut assembly, 41 - bolt head, 411 - main rod section, 4111 - flat slot, 4112 - hexagonal slot, 412 - transition rod section, 413 - self-drilling pointed tail, 42 - slotted nut. Specific implementation mode

[0030] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0031] It should be noted that the following detailed description is exemplary and is intended to provide further explanation of the present application. Unless otherwise specified, all technical and scientific terms used herein have the same meaning as commonly understood by those of ordinary skill in the technical field to which this application belongs.

[0032] It should be noted that the terms used herein are only for describing specific implementation modes and are not intended to limit the exemplary implementation modes according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0033] As Figures 1 - 8 shown, this embodiment provides a steel frame - cold-formed thin-walled steel shear wall, including a steel frame, a cold-formed thin-walled steel keel is installed inside the frame of the steel frame, and keel joint reinforcement devices are arranged at the joints of the cold-formed thin-walled steel keel.

[0034] In the embodiments of the present invention, the keel node reinforcement devices are all installed between adjacent members within each grid of the cold-formed thin-walled steel keel.

[0035] In the embodiments of the present invention, the keel node reinforcement devices all adopt telescopic support components.

[0036] In the embodiments of the present invention, the steel frame is formed by connecting two frame columns and one frame beam. The connection between the frame beam and the frame column adopts an end plate connection node, and the end plate connection node is that the end plate welded at the end of one member is connected to the end plate or column flange of another member through high-strength bolts.

[0037] In the embodiments of the present invention, the cold-formed thin-walled steel keel is formed by connecting 7 horizontally distributed columns, 2 vertically distributed rigid cross braces, an upper guide rail, a lower guide rail, and 18 rigid diagonal braces through self-tapping bolt and nut assemblies. Openings are provided at the positions where the cross brace webs of the rigid cross braces pass through the columns for the columns to pass through longitudinally. The rigid diagonal braces are all arranged within each grid of the cold-formed thin-walled steel keel. The rigid diagonal braces in adjacent horizontal grids are integrally distributed in a herringbone shape. Each member is connected through a self-tapping bolt and nut assembly. The rigid diagonal braces are connected to the upper and lower guide rails through 2 self-tapping bolt and nut assemblies. The rigid diagonal braces are connected to the columns and rigid cross braces through gusset plates and self-tapping bolt and nut assemblies.

[0038] In the embodiments of the present invention, keel node reinforcement devices are provided between the columns and the upper guide rail, between the columns and the lower guide rail, between the columns and the rigid diagonal braces, and between the rigid diagonal braces and the rigid cross braces.

[0039] In the embodiments of the present invention, each keel node reinforcement device includes a main pipe body, two threaded rods, and two rotary shaft type articulated positioners. The inner ends of the threaded rods are coaxially threadedly connected to the same end side of the main pipe body, and the rotary shaft type articulated positioners are all installed at the outer ends of the threaded rods on the same side.

[0040] In the embodiments of the present invention, each rotary shaft type articulated positioner includes a fixed end support and a rotary shaft rod. The fixed end support is symmetrically provided with through holes along the radial direction. One end of the rotary shaft rod is provided with a connecting rod, and the connecting rod is coaxially installed and connected to the above-mentioned through holes. The other end of the rotary shaft rod is threadedly connected to the outer end of the threaded rod on the same side, and a limit bolt is screwed on the side. The fixed end support is welded to the cold-formed thin-walled steel keel.

[0041] In the embodiments of the present invention, each self-tapping bolt and nut assembly includes a drilled bolt and a slotted nut. The drilled bolt includes a bolt head, a main body rod section, a transition rod section, and a self-drilling pointed tail coaxially and fixedly arranged from top to bottom. The self-drilling pointed tail includes two cutting edges. Threads are formed on the cylindrical wall of the cylindrical opening of the slotted nut, and the threads are threadedly connected to the threads of the main body rod section of the drilled bolt.

[0042] In an embodiment of the present invention, the bolt head is an external hexagonal screw head, and an internal hexagonal notch is provided on the top surface of the bolt head. A tool groove is provided on the bottom surface of the internal hexagonal notch, and the tool groove is a flat groove and a hexagonal groove.

[0043] In an embodiment of the present invention, the steel frame - cold - formed thin - walled steel shear wall can be used in steel - structure prefabricated buildings.

[0044] In an embodiment of the present invention, the frame column is integrally formed by a flange and a web to form an I - shaped cross - section, and an end plate is welded on the frame column.

[0045] In an embodiment of the present invention, the frame beam is integrally formed by a flange and a web to form an I - shaped cross - section.

[0046] In an embodiment of the present invention, bolt holes are provided on the frame beam, the frame column, and the end plate.

[0047] In an embodiment of the present invention, the column is a cold - formed thin - walled steel C - shaped cross - section member, and two rigid cross braces are provided in the middle of the column.

[0048] In an embodiment of the present invention, the rigid cross brace is a cold - formed thin - walled steel U - shaped member, and a hole is opened at the position where the web of the cross brace passes through the column.

[0049] In an embodiment of the present invention, the upper and lower guide rails are cold - formed thin - walled steel U - shaped members, and a rigid diagonal brace is provided in each grid formed by the upper and lower guide rails, the column, and the rigid cross brace.

[0050] In an embodiment of the present invention, the rigid diagonal brace is a cold - formed thin - walled steel U - shaped member. The connection between the rigid diagonal brace and the column and the rigid cross brace is connected by a gusset plate through a self - tapping bolt and nut assembly, and the rigid diagonal brace and the upper and lower guide rails are locked by a self - tapping bolt and nut assembly.

[0051] In an embodiment of the present invention, the gusset plate is a cold - formed thin - walled steel plate member used at the connection between the rigid diagonal brace and the column and the rigid cross brace.

[0052] In an embodiment of the present invention, the keel node reinforcement device is a cold - formed thin - walled steel keel node strengthening member, and the overall length of the device is adjusted by the threaded extension length between the main body and the threaded rod.

[0053] A splicing method for a steel frame - cold - formed thin - walled steel shear wall: The steel frame is connected by end - plate connection joints with high - strength bolts among 2 frame columns and 1 frame beam. The frame columns are located at both ends of the frame beam, and the end plates are located above the column flanges. The cold - formed thin - walled steel keel is formed by connecting 7 vertical columns, 2 rigid cross - braces, upper and lower guide rails, and 18 rigid diagonal braces through self - tapping bolt - nut assemblies. 7 vertical columns are placed at equal distances along the length direction of the wall, and the side vertical columns are connected to the column flanges through self - tapping screws. The rigid cross - braces are arranged at equal distances along the height direction of the wall. Openings are provided at the positions where the cross - brace webs pass through the vertical columns to allow the vertical columns to pass through the whole length. The upper guide rail is connected to the beam flange through a self - tapping screw assembly, and the lower guide rail is connected to the vertical column through a self - tapping bolt - nut assembly. The rigid diagonal braces are arranged in each grid formed by the vertical columns, upper and lower guide rails, and rigid cross - braces. The connections between the rigid diagonal braces and the vertical columns and rigid cross - braces are made by using gusset plates through self - tapping bolt - nut assemblies. The method includes the following steps:

[0054] Step 10: First, horizontally place the frame columns, and use bolts to connect the column flanges welded with end plates to the beam ends to form a portal structure. Stiffeners can be set in the joint area, and holes are opened at the corresponding positions of the column flanges and beam flanges for facilitating later connection with the cold - formed thin - walled steel keel.

[0055] Step 20: Cut and process the cold - formed thin - walled steel keel with corresponding dimensions in the factory for connection; circular holes are opened at the corresponding positions of the side vertical columns of the light steel keel for facilitating later connection with the steel frame.

[0056] Step 30: Install the cold - formed thin - walled steel keel inside the steel frame and fix it with self - tapping bolt - nut assemblies. The arrangement positions of the self - tapping bolt - nut assemblies correspond to the opening positions of the steel frame.

[0057] Step 40: Weld the fixed end of the keel node reinforcement device to the cold - formed thin - walled steel channel by welding, and connect the main pipe body and the rotary - shaft type articulated locator through the rotating threaded rod. After fixation, an integral body is formed.

[0058] In the embodiment of the present invention, the stiffeners are strip - shaped strengthening members arranged in pairs on both sides of the web of the frame column.

[0059] In the embodiment of the present invention, when opening holes in the steel frame, threads are required inside the holes, which can enable the self - tapping bolt - nut to better connect the steel frame and the cold - formed thin - walled steel keel.

[0060] In the embodiment of the present invention, the limit bolts need to be screwed in from both sides simultaneously.

[0061] The frame columns of the present invention need to be paired with stiffeners on both sides of the web to improve the overall stiffness of the joints; a gusset plate is welded to the flange of the frame column at the connection with the beam section to improve the bearing capacity of the joints. The keel joint reinforcement device needs to be arranged at each joint of the cold-formed thin-walled steel keel grid. When the wall is subjected to reciprocating tensile and compressive forces under earthquake action, it can enhance the lateral stiffness, bearing capacity and energy dissipation capacity of the wall. Compared with self-tapping screws, the self-tapping bolt and nut assembly can effectively reduce the repeated extrusion of the screws at the connection under low-cycle reversed loading, the continuous expansion of the screw holes, resulting in cumulative damage to the screws, and finally shear failure. The advantages of the present invention are:

[0062] 1. The cold-formed thin-walled steel keel joints are provided with strengthening members, which can improve the shear bearing capacity of the wall and have stronger lateral stiffness.

[0063] 2. The keel joint reinforcement device adopts a rotary hinge assembly method, which is convenient to install and has a wide range of applicable scenarios.

[0064] 3. The components of the keel joint reinforcement device are connected by threaded rods. The threaded rods can be replaced with threaded rods of corresponding lengths according to different usage scenarios to meet the usage requirements.

[0065] 4. The self-tapping bolt and nut assembly is provided with a flat blade groove and a cross blade groove, which reduces the limitation on installation tools and improves work efficiency.

[0066] 5. The self-tapping bolt and nut assembly can slightly expand the self-drilled hole by using a gradually increasing transition rod section, so that the main rod section with external threads can be squeezed into the self-drilled hole and the corresponding internal threads can be screwed out. There is no need to pre-process a preset hole on the part to be fixed before installation, and the installation is more convenient.

[0067] The shear bearing capacity of the reinforced diagonal brace joints of the present invention is improved, and the lateral stiffness of the cold-formed thin-walled steel keel structure is increased. There is a significant coupling effect between the steel frame and the cold-formed thin-walled steel shear wall filled inside, which optimizes the structural force, improves the integrity of the wall, and forms a new type of steel frame-shear wall structure. Anti-pulling parts are arranged at the bottom of the wall. The lower end of the anti-pulling part is locked with the lower guide rail by 2 self-tapping bolt and nut assemblies, and the upper end is connected with the column web by 6 self-tapping bolt and nut assemblies.

[0068] The above are only the preferred embodiments of the present invention, and are not intended to limit the present invention in other forms. Any person skilled in the art may use the disclosed technical content to make changes or modifications into equivalent embodiments with equivalent changes. However, any simple modification, equivalent change and modification made to the above embodiments based on the technical essence of the present invention without departing from the technical solution content of the present invention still belong to the protection scope of the technical solution of the present invention.

Claims

1. A steel frame - cold - formed thin - walled steel shear wall, characterized in that: It includes a steel frame, inside which cold-formed thin-walled steel keels are installed. At the joints of the cold-formed thin-walled steel keels, keel joint reinforcement devices are provided; the keel joint reinforcement devices are all installed between adjacent members within each grid of the cold-formed thin-walled steel keels; the keel joint reinforcement devices all adopt telescopic support components; the cold-formed thin-walled steel keels are formed by connecting a number of horizontally distributed columns, a number of vertically distributed rigid cross braces, an upper guide rail, a lower guide rail, and a number of rigid diagonal braces through self-tapping bolt and nut assemblies. The keel joint reinforcement devices all include a main body, two threaded rods, and two rotary hinge positioners. The inner ends of the threaded rods are coaxially thread-connected to the same end side of the main body, and the rotary hinge positioners are all installed at the outer ends of the threaded rods on the same side.

2. The steel frame - cold - formed thin - walled steel shear wall according to claim 1, wherein: The steel frame is formed by connecting two frame columns and one frame beam. The connection between the frame beam and the frame columns adopts an end plate connection joint, and the end plate connection joint is that the end plate welded to the end of one member is connected to the end plate or column flange of another member through high-strength bolts.

3. The steel frame - cold - formed thin - walled steel shear wall according to claim 1, wherein: Openings are provided at the positions where the cross brace webs of the rigid cross braces pass through the columns for the columns to pass through longitudinally. The rigid diagonal braces are all arranged within each grid of the cold-formed thin-walled steel keels. The rigid diagonal braces in horizontally adjacent grids are integrally distributed in a herringbone pattern. The rigid diagonal braces are connected to the columns and the rigid cross braces through gusset plates by self-tapping bolt and nut assemblies.

4. The steel frame - cold - formed thin - walled steel shear wall according to claim 3, characterized in that: Keel joint reinforcement devices are provided between the columns and the upper guide rail, between the columns and the lower guide rail, between the columns and the rigid diagonal braces, and between the rigid diagonal braces and the rigid cross braces.

5. The steel frame - cold - formed thin - walled steel shear wall according to claim 1, wherein: The rotary hinge positioners all include a fixed-end support and a rotary shaft member. The fixed-end support is symmetrically provided with through holes along the radial direction. One end of the rotary shaft member is provided with a connecting rod, and the connecting rod is coaxially installed and connected to the through holes. The other end of the rotary shaft member is thread-connected to the outer end of the threaded rod on the same side, and the fixed-end support is welded to the cold-formed thin-walled steel keel.

6. The steel frame - cold - formed thin - walled steel shear wall according to claim 3, characterized in that: The self-tapping bolt and nut assemblies all include drilled bolts and grooved nuts. The drilled bolts include a bolt head, a main body rod section, a transition rod section, and a self-drilling pointed tail coaxially fixed from top to bottom. The self-drilling pointed tail includes two cutting edges. The cylindrical wall of the cylindrical opening of the grooved nut is formed with threads, and the threads are screwed with the threads of the main body rod section of the drilled bolt.

7. The steel frame - cold - formed thin - walled steel shear wall according to claim 6, characterized in that: The bolt head is an external hexagonal bolt head. An internal hexagonal notch is provided on the top surface of the bolt head, and a tool groove is provided on the bottom surface of the internal hexagonal notch. The tool groove is a straight groove and a hexagonal groove.

Images