An annularly arranged shear key column foot node

Abstract

The utility model discloses a kind of annularly arranged shear key column foot node, including concrete foundation, steel pipe column, column bottom plate, shear key, pouring hole and stiffening rib;Column bottom plate is horizontally arranged at the top of concrete foundation, steel pipe column is vertically fixed on the upper surface center position of column bottom plate;Pouring hole is set in the center of column bottom plate;Shear key has four, four shear keys are annularly symmetrically arranged with pouring hole as center, the long side of each shear key is perpendicular to column bottom plate and is welded on the lower surface of column bottom plate, and the short side of four shear keys is all towards the center of pouring hole;The stiffening rib is vertically welded between steel pipe column and column bottom plate, and stiffening rib is evenly distributed along the circumference of steel pipe column.The utility model uses the innovative design that four angle steels are annularly symmetrically arranged, so that shear bearing capacity is improved, and simultaneously foot anchor bolt and shear key form double shear system, substantially enhance the seismic performance of node.Moreover, the design effectively avoids foundation reinforcement, reduces reinforcement bending, so that installation period is shortened.

Description

Technical Field

[0001] This utility model relates to the field of shear key column base joints. More specifically, this utility model relates to a ring-shaped arrangement of shear key column base joints. Background Technology

[0002] In steel structure buildings, column base joints are an essential part of every steel structure. Rigid column bases must withstand not only horizontal shear forces and axial forces, but also the effects of bending moments. In practical engineering, most column base joints require shear keys. However, in actual engineering projects, the reinforcement in concrete foundations is densely distributed, especially when columns are built on beams, making shear keys prone to conflict with the reinforcement and difficult to install. The quality of the column base joint directly affects the structural safety; therefore, properly handling column base shear key joints, i.e., designing reasonable shear keys, is the most crucial aspect of such projects. Traditional methods for column base shear key joints involve directly welding shear keys made of H-beams, channel steel, or square tubing to the column base plate. First, due to the dense distribution of reinforcement in the column base concrete foundation, this method often causes the shear key to interfere with the reinforcement in the concrete column or beam. This necessitates repeated bending of the reinforcement during relocation to avoid the shear key, thus affecting the strength of the reinforcement and the construction progress. Second, this method typically involves creating pouring holes in the column base slab. Since the shear key is usually located in the center of the base slab, all pouring holes are generally distributed around the shear key, which can weaken the strength of the column base slab and thus reduce the transmission of shear force. Therefore, there is an urgent need to provide a new type of shear key column base joint to solve this problem. Utility Model Content

[0003] To achieve these objectives and other advantages of the present invention, a preferred embodiment of the present invention provides a ring-shaped shear key column base node, including a concrete foundation, a steel pipe column, a column base plate, a shear key, a casting hole, and stiffening ribs.

[0004] The column base plate is horizontally set on top of the concrete foundation, and the steel pipe column is vertically fixed to the center of the upper surface of the column base plate; a pouring hole is opened in the center of the column base plate;

[0005] There are four shear keys, and the shear keys are angle steels. The four shear keys are arranged in a ring symmetrically with the casting hole as the center. The long side of each angle steel is perpendicular to the column base plate and welded to the lower surface of the column base plate. The short sides of the four angle steels all face the center of the casting hole.

[0006] The stiffening ribs are vertically welded between the steel pipe column and the column base plate, and the stiffening ribs are evenly distributed along the circumference of the steel pipe column.

[0007] Preferably, it further includes: anchor bolts, which penetrate the column base plate and are anchored in the concrete foundation, and the top of the anchor bolts is fixedly connected to the column base plate by a gasket.

[0008] Preferably, it further includes: an annular steel plate welded to the lower surface of the column base plate, wherein the inner diameter of the annular steel plate is 50 mm larger than the diameter of the casting hole, and the outer diameter is smaller than the diameter of the shear key arrangement circle.

[0009] Preferably, it also includes: a strain gauge embedded in the long side of the shear key and a pressure sensor on the lower surface of the column base plate, with the sensor wires led out to the monitoring terminal through a pre-embedded conduit.

[0010] Preferably, an annular reinforcing plate is provided at the connection between the steel pipe column and the column base plate. The outer diameter of the annular reinforcing plate is 1.3 times the outer diameter of the steel pipe column, and the inner diameter is the same as the inner diameter of the steel pipe column.

[0011] Preferably, stress relief holes are provided on the annular reinforcing plate, with 4-6 holes evenly arranged around the circumference.

[0012] This utility model offers at least the following advantages: It provides a circular shear key column base node with an innovative design employing four angle steels arranged symmetrically in a ring, thereby enhancing shear bearing capacity. Simultaneously, the anchor bolts and shear keys form a dual shear-resistant system, significantly improving the node's seismic performance. Furthermore, this design effectively avoids foundation reinforcement, reducing reinforcement bending and shortening the installation period.

[0013] Other advantages, objectives and features of this invention will be partly apparent from the following description, and partly understood by those skilled in the art through study and practice of this invention. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the annular arrangement of shear key column base nodes in this utility model.

[0015] Figure 2 for Figure 1 AA section diagram.

[0016] Figure 3 This is a schematic diagram showing the distribution of the annular steel plate in this utility model. Detailed Implementation

[0017] The present invention will now be described in further detail with reference to the accompanying drawings, so that those skilled in the art can implement it based on the description.

[0018] The following description is intended to disclose the present invention so that those skilled in the art can implement it. The preferred embodiments described below are merely examples, and other obvious modifications will occur to those skilled in the art. The basic principles of the present invention defined in the following description can be applied to other embodiments, modifications, improvements, equivalents, and other technical solutions that do not depart from the spirit and scope of the present invention.

[0019] Those skilled in the art should understand that in the disclosure of this utility model, the terms "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", 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 utility model 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, the above terms should not be construed as a limitation of this utility model.

[0020] It is understood that the term "a" should be understood as "at least one" or "one or more", that is, in one embodiment, the number of an element can be one, while in another embodiment, the number of the element can be multiple, and the term "a" should not be understood as a limitation on the number.

[0021] like Figure 1-3 As shown, a preferred embodiment of this utility model provides a ring-shaped shear key column base node, including a concrete foundation 1, a steel pipe column 2, a column base plate 8, shear keys 3, a pouring hole 4, and stiffening ribs 5; the column base plate 8 is horizontally set on the top of the concrete foundation 1, and the steel pipe column 2 is vertically fixed to the center of the upper surface of the column base plate; a pouring hole 4 is opened in the center of the column base plate; there are four shear keys 3, and the shear keys 3 are angle steels, the four shear keys 3 are arranged symmetrically in a ring around the pouring hole, the long side of each angle steel is perpendicular to the column base plate and welded to the lower surface of the column base plate, and the short sides of the four angle steels all face the center of the pouring hole; the stiffening ribs 5 are vertically welded between the steel pipe column 2 and the column base plate 8, and the stiffening ribs 5 are evenly distributed along the circumference of the steel pipe column 2.

[0022] In the above technical solution, the vertical load is transferred to the column base plate 8 through the steel pipe column 2, and then distributed to the concrete foundation 1; the horizontal shear force is mainly borne by four ring-shaped shear keys 3, which are transferred through the interlocking action of the long side of the angle steel and the concrete; the bending moment is resisted by the stiffening ribs 5 and the column base plate 8 together. The ring-shaped shear keys 3 make the shear force transfer path more direct, avoiding the stress concentration problem caused by the traditional central arrangement of shear keys. The pouring hole 4 is located in the central area where the stress is relatively small, reducing the weakening of the base plate strength.

[0023] The shear key 3 arranged in a ring effectively avoids the foundation reinforcement and reduces the bending of the reinforcement; the optimized shear force transfer path improves the safety factor of the node; the design of the central pouring hole 4 ensures the quality of concrete pouring; and the setting of stiffening ribs 5 enhances the bending resistance of the node.

[0024] Another technical solution also includes: anchor bolt 6, which penetrates the column base plate 8 and is anchored in the concrete foundation 1, and the top of the anchor bolt is fixedly connected to the column base plate through a gasket 7.

[0025] In the above technical solution, the anchor bolts not only fix the column base plate, but also provide pull-out and shear resistance under extreme loads, preventing column base slippage or overturning. The shims adjust the levelness of the column base plate, ensuring installation accuracy. Furthermore, the anchor bolts and shear keys work synergistically to form a dual shear resistance mechanism, improving the overall stability of the joint.

[0026] Another technical solution also includes: an annular steel plate 10 welded to the lower surface of the column base plate 8, wherein the inner diameter of the annular steel plate is 50 mm larger than the diameter of the casting hole 4 and the outer diameter is smaller than the diameter of the arrangement circle of the shear key 3.

[0027] In the above technical solution, the annular steel plate first serves as an additional shear-resistant member, forming an annular shear-resistant band with the shear key 3, thereby expanding the shear force transmission area, reducing stress concentration in the welding area, and improving the fatigue life of the joint; secondly, it serves as a stress diffusion plate, distributing the concentrated stress transmitted by the steel pipe column 2 more evenly to the concrete foundation 1, and the annular steel plate can also enhance the rigidity of the column base plate, prevent local deformation, and ensure uniform shear force transmission; finally, it serves as a pouring guide plate, guiding the concrete to flow evenly from the central pouring hole 4 to the surrounding area.

[0028] Another technical solution also includes: a strain gauge embedded in the long side of the shear key 3 and a pressure sensor on the lower surface of the column base plate 8, with the sensor wires led out to the monitoring terminal through a pre-embedded conduit.

[0029] In the above technical solution, strain gauges monitor the strain distribution of the shear key 3 in real time and calculate the actual shear force value through the strain-stress relationship; pressure sensors measure the contact pressure between the column base plate 8 and the concrete foundation 1, reflecting the vertical load transfer; the data is transmitted to the monitoring terminal through wires for real-time display, storage and analysis.

[0030] In another technical solution, an annular reinforcing plate is provided at the connection between the steel pipe column 2 and the column base plate 8. The outer diameter of the annular reinforcing plate is 1.3 times the outer diameter of the steel pipe column, and the inner diameter is the same as the inner diameter of the steel pipe column.

[0031] In the above technical solution, the bending moment transmitted by the steel pipe column 2 is converted into a couple between the annular reinforcing plate and the column base plate 8; the axial force is transmitted to the column base plate 8 through a larger contact area; local deformation at the root of the steel pipe column 2 is restrained, and the rotational stiffness of the joint is improved. The annular reinforcing plate can effectively disperse the stress in the connection area between the steel pipe column and the column base plate, reduce stress concentration, and improve the fatigue life of the joint. In addition, the reinforcing plate can improve the stiffness of the welded area and reduce deformation, making it suitable for large-span or heavy-load steel structures.

[0032] In another technical solution, stress relief holes are provided on the annular reinforcing plate, with 4-6 holes evenly arranged around the circumference.

[0033] In the above technical solution, stress relief holes can effectively alleviate welding thermal stress, reduce deformation of the reinforcing plate, and ensure installation accuracy. The holes are evenly distributed to avoid weakening the strength of critical areas. Furthermore, the holes can serve as venting channels during concrete pouring, improving the quality of the pour.

[0034] After the above-mentioned annular arrangement of shear key column base nodes is installed, concrete 9 is poured on it to form an integral rigid structure.

[0035] Although the embodiments of this utility model have been disclosed above, they are not limited to the applications listed in the specification and embodiments. They can be applied to various fields suitable for this utility model. For those skilled in the art, other modifications can be easily made. Therefore, without departing from the general concept defined by the claims and their equivalents, this utility model is not limited to the specific details and the illustrations shown and described herein.

Claims

1. A ring-shaped arrangement of shear key column base nodes, characterized in that, This includes concrete foundations, steel pipe columns, column base plates, shear keys, casting holes, and stiffening ribs; The column base plate is horizontally set on top of the concrete foundation, and the steel pipe column is vertically fixed to the center of the upper surface of the column base plate; a pouring hole is opened in the center of the column base plate; There are four shear keys, and the shear keys are angle steels. The four shear keys are arranged in a ring symmetrically with the casting hole as the center. The long side of each angle steel is perpendicular to the column base plate and welded to the lower surface of the column base plate. The short sides of the four angle steels all face the center of the casting hole. The stiffening ribs are vertically welded between the steel pipe column and the column base plate, and the stiffening ribs are evenly distributed along the circumference of the steel pipe column.

2. The annular arrangement of shear key column base nodes according to claim 1, characterized in that, Also includes: Anchor bolts are used to penetrate the column base plate and are anchored in the concrete foundation. The top of the anchor bolts is fixedly connected to the column base plate by a gasket.

3. The annular arrangement of shear key column base nodes according to claim 1, characterized in that, Also includes: A ring-shaped steel plate is welded to the lower surface of the column base plate. The inner diameter of the ring-shaped steel plate is 50 mm larger than the diameter of the casting hole, and the outer diameter is smaller than the diameter of the shear key arrangement circle.

4. The annular arrangement of shear key column base nodes according to claim 1, characterized in that, Also includes: Strain gauges are embedded in the long side of the shear key and pressure sensors are installed on the lower surface of the column base plate. The sensor wires are led out to the monitoring terminal through pre-embedded conduits.

5. The annular arrangement of shear key column base nodes according to claim 1, characterized in that, An annular reinforcing plate is installed at the connection between the steel pipe column and the column base plate. The outer diameter of the annular reinforcing plate is 1.3 times the outer diameter of the steel pipe column, and the inner diameter is the same as the inner diameter of the steel pipe column.

6. The annular arrangement of shear key column base nodes according to claim 5, characterized in that, Stress relief holes are provided on the annular reinforcing plate, with 4-6 holes evenly arranged around the circumference.

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