Exterior leakage type rigid joint column foot

Abstract

The application discloses an outer-leaking rigid joint column foot and belongs to the technical field of building construction. The outer-leaking rigid joint column foot comprises a steel column, an expansion structure connected to the bottom end of the steel column and a bottom plate, and the steel column is fixed on the bottom plate through the expansion structure; the steel column is an H-shaped steel column comprising a web plate and a flange plate; the expansion structure comprises an expansion web plate and an expansion flange plate; the expansion web plate is formed at the bottom end of the web plate and is in the same plane with the web plate and has the shape of upper trapezoid and lower rectangle; the expansion flange plate is connected to the bottom end of the flange plate and comprises a slant flange plate and a vertical flange plate in sequence, the slant flange plate is connected to the two hips of the trapezoid and is perpendicular to the expansion web plate, and the vertical flange plate is connected to the two vertical edges of the rectangle and is perpendicular to the expansion web plate; a plurality of pairs of web plate stiffening ribs perpendicular to the expansion web plate are symmetrically arranged on the two sides of the expansion web plate; and a plurality of flange stiffening ribs parallel to each other and perpendicular to the vertical flange plate are arranged on the outer side of the vertical flange plate. The outer-leaking rigid joint column foot disclosed by the application enlarges the force transmission area of the column foot and improves the local rigidity.

Description

Technical Field

[0001] This application relates to the field of building construction technology, and in particular to an externally exposed rigid column base. Background Technology

[0002] With the rapid development of prefabricated steel structure buildings, column base joints, as key connection points in the structure, are crucial for seismic performance. Rigid column bases are classified into exposed, encased, embedded, and inserted types. In high-rise or large-span structures, exposed rigid column bases are commonly used to connect H-shaped steel columns to concrete foundations. However, traditional designs have significant problems: under high-intensity earthquakes, column base joints often experience anchor bolt breakage, concrete crushing, or base slab deformation due to concentrated bending moment and shear force, leading to failure to meet code requirements in ultimate bearing capacity calculations. Current technologies address this problem by increasing the base slab thickness or adding external concrete encasing; however, this not only increases material costs and extends the construction period but may also affect building height and the layout of equipment pipelines.

[0003] In some related technologies, a standard exposed rigid column base is used, in which the H-shaped steel column is anchored to the foundation through a base plate, with the web and flanges of the H-shaped steel column directly welded to the base plate, and the load transferred through anchor bolts. The base plate has the same width as the steel column section, and usually only a few stiffening ribs are set in the web. The inventors of this application have noticed that this solution has the following problems: the limited area of ​​the base plate leads to insufficient concrete bearing area; the local stiffness of the flanges and web is weak, making them prone to buckling instability under strong earthquakes; the number of anchor bolts is small, resulting in insufficient pull-out resistance, making it difficult to meet high bearing capacity calculations; in addition, this solution relies on on-site welding reinforcement at the joints, resulting in low construction efficiency and making it unsuitable for H-shaped steel columns with different cross-sectional dimensions.

[0004] In some related technologies, reinforced column bases are achieved by encasing them in concrete, which involves pouring concrete around the steel column to form a composite structure, thereby increasing the bearing area. Simultaneously, diagonal stiffeners are added to the web to enhance shear resistance. However, the inventors of this application have noted the following problems with this concrete-encased approach: it significantly increases material usage and construction complexity, extending the construction period; the synergistic performance between concrete and steel structures is poor, making cracking more likely; and this approach is unsuitable for exposed design requirements, limiting the flexibility of building space; furthermore, the stiffener arrangement is simplistic and cannot effectively address stress concentration in the flange area. Summary of the Invention

[0005] Based on the above understanding, according to one embodiment of this application, the objective is to provide an externally exposed rigid column base to at least solve the aforementioned technical problems of insufficient bearing area and weak local rigidity of the column base. This objective can be achieved through the following technical solutions: An exposed rigid column base includes: a steel column, an extension structure connected to the bottom end of the steel column, and a base plate, wherein the steel column is fixed to the base plate through the extension structure, and the base plate is used to fix it to the concrete foundation; The steel column is an H-shaped steel column, including: a web and flanges; The extended structure includes: an extended web and an extended flange; the extended web is formed at the bottom end of the web and is in the same plane as the web, and has a shape of an upper trapezoid and a lower rectangle; the extended flange is connected to the bottom end of the flange and includes a sloping flange and a vertical flange in sequence, the sloping flange is connected at the two waists of the trapezoid and is perpendicular to the extended web, and the vertical flange is connected at the two vertical sides of the rectangle and is perpendicular to the extended web; The extended web is symmetrically provided on both sides with multiple pairs of web stiffening ribs perpendicular to the extended web. The outer side of the vertical flange is provided with multiple flange stiffening ribs that are parallel to each other and perpendicular to the vertical flange.

[0006] Preferably, the extended web is integrally formed with the web of the H-shaped steel column.

[0007] Preferably, the upper trapezoid of the extended web is an isosceles trapezoid.

[0008] Preferably, the extended web is formed by extending the web of the H-shaped steel column downward and outward, with the length of the rectangle being equal to the lower base of the trapezoid and the width of the rectangle being greater than the width of the web of the H-shaped steel column.

[0009] Preferably, the inclined flange is trapezoidal, with the upper base length equal to the width of the flange of the H-shaped steel column and the lower base length equal to the length of the vertical flange.

[0010] More preferably, the inclined flange is an isosceles trapezoid.

[0011] Preferably, the spacing between two adjacent stiffening ribs on each side of the extended web is 100-200 mm.

[0012] Preferably, the flange stiffening ribs and web stiffening ribs are at the same height as the vertical flange plate; Preferably, the flange stiffening rib and the web stiffening rib are both pentagons formed by removing one corner from two adjacent sides of a rectangle.

[0013] Preferably, the bottom of the extended web, the bottom of the vertical flange, the bottom of the web stiffener, and the bottom of the flange stiffener are all welded to the base plate.

[0014] Preferably, the externally exposed rigid joint base has an axisymmetric structure.

[0015] Preferably, the outer edge of the extended structure does not exceed the outer edge of the base plate, and the outer edges of the web stiffener and the flange stiffener are flush with the outer edge of the base plate.

[0016] Preferably, the base plate is anchored to the concrete foundation by high-strength bolts.

[0017] Beneficial effects: According to one embodiment of this application, the provided externally exposed rigid column base has an extension structure below the H-shaped steel column. The extension web of the extension structure is coplanar with the web of the H-shaped steel column and has a shape of upper trapezoid and lower rectangle. The extension flange connects to the flange of the H-shaped steel column and is respectively vertically arranged at the two waists of the trapezoid and the two vertical sides of the rectangle of the extension web. The steel column is fixed to the base plate through the extension structure, which increases the force transmission area of ​​the column base and adds stiffening ribs to the extension structure to improve the local stiffness.

[0018] Furthermore, by employing the exposed rigid column base of this application, there is no need to pour concrete around the steel column, thus avoiding any increase in concrete usage. This application features a simple structure, modular fabrication, and convenient construction. During the factory prefabrication stage, the steel column and extension structure are directly connected and fixed into precast components. After the precast components are transported to the site, they are directly aligned and welded to the base plate during on-site assembly. The base plate is then anchored in the concrete foundation, allowing for rapid assembly. Attached Figure Description

[0019] Figure 1 This is a three-dimensional view of the externally exposed rigid joint column provided in the embodiments of this application; Figure 2 This is a left view of the exposed rigid column base provided in the embodiments of this application; Figure 3 This is a front view of the exposed rigid column base provided in the embodiments of this application; Figure 4 This is a top view of the exposed rigid column base provided in the embodiments of this application.

[0020] Reference numerals: 1-web plate; 2-wing flange plate; 31-sloping wing flange plate; 32-vertical wing flange plate; 4-web plate stiffening rib; 5-wing flange stiffening rib; 6-bottom plate. Detailed Implementation

[0021] The technical solutions of this application will be clearly and completely described below with reference to the embodiments of this application. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit this application or its application or use. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the scope of protection of this application.

[0022] An embodiment of this application provides an externally exposed rigid column base, comprising: a steel column, an extension structure connected to the bottom end of the steel column, and a base plate. The steel column is fixed to the base plate via the extension structure at the bottom end, and the base plate is used for fixing to the concrete foundation. The steel column is an H-shaped steel column, including a web and flanges.

[0023] The extended structure includes an extended web and extended flanges. The extended web is formed at the bottom end of the web of the H-shaped steel column, and the extended web and the web are on the same plane, with a shape of an upper trapezoid and a lower rectangle. The extended flanges are connected to the bottom end of the flanges, and successively include oblique flanges and vertical flanges connected to them. The oblique flanges are welded to the two sides of the trapezoid and are perpendicular to the extended web, while the vertical flanges are welded to the two vertical sides of the rectangle and are perpendicular to the extended web. By setting an extended structure at the bottom of the H-shaped steel column, the H-shaped steel column is extended downwards and outwards. Compared with the column base structure where the H-shaped steel column is directly welded to the base plate, this increases the force transmission area of ​​the column base, optimizes the force transmission path, and increases the bearing area of ​​the base plate.

[0024] To prevent instability, stiffening ribs are provided in the extended structure. Specifically, refer to... Figure 1 and Figure 4 As shown, multiple pairs of web stiffeners 4, perpendicular to the extended web, are symmetrically arranged on both sides of the extended web. Further, the spacing between adjacent web stiffeners on each side is controlled to be 100-200 mm. Multiple flange stiffeners, parallel to each other and perpendicular to the vertical flange, are arranged on the outer side of the vertical flange. By adding web stiffeners 4 and flange stiffeners 5, the local stiffness of the extended structure is enhanced, the local stiffness of the column base is strengthened, and buckling instability is prevented. More preferably, the flange stiffeners and web stiffeners are at the same height as the vertical flange, which further ensures stiffness and improves stability. In addition, the flange stiffeners and web stiffeners are shaped as pentagons formed by removing one corner from two adjacent sides of a rectangle, as shown in the reference diagram. Figure 3 As shown, this type of stiffening rib can further optimize the triangular force transmission path of the column base, which is conducive to uniform force transmission to the foundation.

[0025] In this application, by radially expanding the flanges in the extended structure, the bearing area of ​​the base plate is increased, allowing the bending moment to be uniformly transferred to the foundation through a triangular path. Based on the shape of the extended structure with an upper trapezoid and a lower rectangle, stiffening ribs are added to it. The web stiffening ribs are vertically welded to both sides of the extended web plate to improve shear and buckling resistance. Multiple flange stiffening ribs are arranged in parallel and welded to the outer side of the extended flange plate, optimizing the bending moment transfer path. This results in a force transmission path of steel column-trapezoidal-rectangular + stiffening rib at the column base, forming an efficient triangular force transmission system and optimizing the load transfer path.

[0026] refer to Figure 1 and Figure 3 As shown, in a further preferred embodiment, the extended web of the extended structure and the web of the H-shaped steel column are integrally formed, for example, by directly cutting the outer contour of the plate using a cutting process. This integral forming method not only increases the load-bearing area of ​​the steel column but also makes the connection between the extended structure and the steel column more stable, thus improving the stability of the column base.

[0027] In some preferred embodiments, reference Figure 3 As shown, the extended web formed at the bottom of the web of the H-shaped steel column has an upper trapezoid that is isosceles. Specifically, the extended web, which is an isosceles trapezoid at the top and a rectangle at the bottom, is formed by extending the web of the H-shaped steel column downwards and outwards. The length of the rectangle is equal to the lower base of the trapezoid, and the width of the rectangle is greater than the width of the web of the H-shaped steel column. By optimizing the shape and size of the extended web, the stability of the force transmission at the column base can be further improved by increasing the force transmission area.

[0028] In some preferred embodiments, reference Figure 2 As shown, the inclined flange plate is also trapezoidal, with the upper base length equal to the width of the flange plate of the H-shaped steel column and aligned with it, and the lower base length equal to the length of the vertical flange plate and aligned with it. By optimizing the shape and size of the inclined flange plate, the extended structure is made to contact the bottom of the steel column to the maximum extent, thereby maximizing the force transmission area of ​​the steel column.

[0029] To further improve the stability of the structure, it is even more preferable that the inclined flange is designed as an isosceles trapezoid.

[0030] In some more preferred embodiments, reference Figure 4 As shown, the exposed rigid column base has an overall axisymmetric structure. Specifically, the plane containing the web is symmetrical on both sides, and the plane at the central axis perpendicular to the web is symmetrical on both sides. At the same time, the web stiffeners and flange stiffeners are also symmetrically arranged.

[0031] This application uses exposed rigid column bases, fixing the H-shaped steel column to the base plate via an extension structure welded together. For example... Figure 1 As shown, specifically, the bottom of the extended web, the bottom of the vertical flange, the bottom of the web stiffener, and the bottom of the flange stiffener are all welded and fixed to the base plate. The base plate is then anchored to the concrete foundation using anchor bolts, such as high-strength bolts. Furthermore, the number of anchor bolts can be dynamically adjusted based on seismic calculation results.

[0032] To further improve the force transmission area and local stiffness, refer to Figure 4 As shown, the extended structure is configured such that its outer edge does not exceed the outer edge of the base plate, and the outer edges of the web stiffener and flange stiffener are configured to be flush with the outer edge of the base plate.

[0033] Figures 1 to 4The following diagrams show a three-dimensional structural diagram, a left view, a front view, and a top view of an externally exposed rigid column base provided in one embodiment of this application.

[0034] The following will combine Figures 1 to 4 The following is a more detailed explanation of the exposed rigid connection column base: In this embodiment, the provided exposed rigid column base has its H-shaped steel column web 1 and the extended web of the extended structure integrally formed, forming a single plate-like structure with a convex shape, symmetrical left and right, and having a top edge, a bottom edge, and outer contour side edges, as shown below. Figure 3 As shown, both sides consist of an upper vertical side, a hypotenuse, and a lower vertical side, forming a stepped shape with inclined steps. The angle between the hypotenuse and the horizontal can range from 30 degrees to 60 degrees, and the hypotenuse slopes downwards and outwards from the upper vertical side to the lower vertical side. The flange plate 2 of the H-shaped steel column is vertically welded to the upper vertical side, the inclined flange plate 31 is vertically welded to the hypotenuse, and the vertical flange plate 32 is vertically welded to the lower vertical side. The flange plate 2, the inclined flange plate 31, and the vertical flange plate 32 are sequentially connected to form the flange plate 2 of the H-shaped steel column and the extended flange plate at the bottom of the flange plate. This extended structure increases the force transmission area of ​​the H-shaped steel column and the bearing area of ​​the base plate 6, thereby improving the pull-out resistance of the anchor bolts and the bearing capacity of the concrete.

[0035] In this embodiment, such as Figure 4 As shown, the H-shaped steel column and its base extension structure, after welding, form an overall axisymmetric structure, meaning it is symmetrical both vertically and horizontally. Figure 2 As shown, the web 1 is symmetrical on both sides, as... Figure 3 As shown, the plane containing the central axis perpendicular to the web 1 is symmetrical on both sides. Furthermore, two pairs of web stiffeners 4 are symmetrically arranged on both sides of the extended web, with a spacing of 150 mm between the two web stiffeners 4 on each side. Two flange stiffeners 5 are spaced apart on the outer sides of the two vertical flange plates 32, and the flange stiffeners 5 on the outer sides of the two vertical flange plates 32 are symmetrically arranged. By adding web stiffeners 4 and flange stiffeners 5 at the extended structure, the local stiffness of the column base is enhanced, preventing buckling instability.

[0036] In this embodiment, by extending the flange of the column base and strengthening the stiffening ribs of the column base, the joint ultimate bearing capacity of the column base can be increased by more than 30%, meeting the verification requirements of high intensity zones, and avoiding the problem of increased concrete consumption caused by traditional reinforcement measures.

[0037] Load transfer mechanism of exposed rigid column base: The stiffening rib system, consisting of web stiffeners 4 and flange stiffeners 5, inhibits buckling of the web and flanges; the extended structure design increases the bearing surface of the base plate 6, allowing bending moments to be uniformly transferred to the foundation through a triangular path; shear force is borne collaboratively by the web stiffeners 4 and anchor bolts; the externally exposed rigid column base can significantly improve the seismic bearing capacity of the column base.

[0038] This application improves and optimizes the column base structure to form the exposed rigid column base, which improves structural performance, construction convenience, and economic performance, and reduces costs. This column base no longer needs to rely on external concrete. The exposed rigid column base is particularly suitable for prefabricated steel structures in high-intensity earthquake zones. It is mainly used for rigid column base nodes of H-beams, which can improve the ultimate bearing capacity of the connection between the column base and the foundation and meet the requirements for verification of the ultimate bearing capacity of the connection between the column base and the foundation in the design.

[0039] The following describes the fabrication and construction process of the exposed rigid column base: Factory preparation of precast components: First, prepare integrally formed sheet metal (web and extended web), and prepare flange plate 2, diagonal flange plate 31, and vertical flange plate 32. Weld and assemble each flange plate to the corresponding position on the sheet metal, so that the H-shaped steel column and the extended structure are welded into a whole. Then, weld the web stiffener 4 and flange stiffener 5 to the corresponding areas of the extended web and vertical flange plate 32 respectively to enhance local stiffness.

[0040] On-site assembly: The prefabricated components welded in the factory are transported to the site, and the base plate is embedded in the concrete foundation; the prefabricated components are aligned with the base plate and welded; the base plate and concrete foundation are anchored by applying pre-tightening force with high-strength bolts; finally, all welds and bolt connections are checked to ensure that there are no misalignments or gaps.

[0041] Adjustment and acceptance: The number of anchor bolts and the arrangement of stiffening ribs can be optimized based on the bearing capacity calculation results in the later stage; after completion, load tests can be carried out to verify the joint stiffness and ultimate bearing capacity.

[0042] Compared with conventional H-beam column bases, some embodiments of this application also have the following advantages: 1) Economical and efficient: Modular design (factory-welded stiffening ribs and extended flanges) reduces on-site work and can shorten the construction period by about 20%; optimized material use avoids unnecessary external concrete wrapping or increased steel column cross-section, which can reduce costs by about 15%.

[0043] 2) Convenient construction: Standardized components enable rapid assembly and are suitable for various H-section steel sections; the exposed design maintains the advantages of the structure and does not occupy additional building space.

[0044] 3) Safe and reliable: Based on the extended structure formed by the downward and outward extension of the H-shaped steel columns, a triangular force transmission system is formed, which optimizes the stress distribution and reduces the risk of local failure; it can be widely used in key seismic structures such as high-rise buildings and bridges.

[0045] 4) High adaptability: The dimensions of the base plate of the column foot can be dynamically adjusted, and the number of anchor bolts can also be determined based on the bearing capacity calculation.

[0046] The description in this application is given for illustrative purposes and is not intended to be exhaustive or to limit the application to the forms disclosed. Many modifications and variations will be apparent to those skilled in the art. The embodiments were chosen and described to better illustrate the principles and practical application of this application and to enable those skilled in the art to understand this application and design various embodiments with various modifications suitable for a particular purpose.

Claims

1. An externally exposed rigid joint column base, characterized in that, include: The steel column, the extension structure connected to the bottom of the steel column, and the base plate, wherein the steel column is fixed to the base plate by the extension structure and the base plate is used to fix it to the concrete foundation; The steel column is an H-shaped steel column, including: a web and flanges; The extended structure includes: an extended web and an extended flange; the extended web is formed at the bottom end of the web and is in the same plane as the web, and has a shape of an upper trapezoid and a lower rectangle; the extended flange is connected to the bottom end of the flange and includes a sloping flange and a vertical flange in sequence, the sloping flange is connected at the two waists of the trapezoid and is perpendicular to the extended web, and the vertical flange is connected at the two vertical sides of the rectangle and is perpendicular to the extended web; The extended web is symmetrically provided on both sides with multiple pairs of web stiffening ribs perpendicular to the extended web. The outer side of the vertical flange is provided with multiple flange stiffening ribs that are parallel to each other and perpendicular to the vertical flange.

2. The externally exposed rigid joint column base according to claim 1, characterized in that, The extended web is integrally formed with the web of the H-shaped steel column.

3. The externally exposed rigid joint column base according to claim 2, characterized in that, The upper trapezoid of the extended web is an isosceles trapezoid; The extended web is formed by extending the web of the H-shaped steel column downward and outward. The length of the rectangle is equal to the lower base of the trapezoid, and the width of the rectangle is greater than the width of the web of the H-shaped steel column.

4. The externally exposed rigid joint column base according to any one of claims 1-3, characterized in that, The inclined flange is trapezoidal, with the upper base length equal to the width of the flange of the H-shaped steel column and the lower base length equal to the length of the vertical flange.

5. The externally exposed rigid joint column base according to claim 4, characterized in that, The inclined flange is an isosceles trapezoid.

6. The externally exposed rigid joint column base according to claim 1, characterized in that, The spacing between the stiffening ribs of two adjacent web plates on each side of the extended web plate is 100-200 mm; The flange stiffening ribs and web stiffening ribs are at the same height as the vertical flange plate.

7. The externally exposed rigid joint column base according to claim 1, characterized in that, The flange stiffeners and web stiffeners are pentagons formed by removing one corner from two adjacent sides of a rectangle. The bottom of the extended web, the bottom of the vertical flange, the bottom of the web stiffener, and the bottom of the flange stiffener are all welded to the base plate.

8. The externally exposed rigid joint column base according to claim 1, characterized in that, The externally exposed rigid joint column base has an axisymmetric structure.

9. The externally exposed rigid joint column base according to claim 1, characterized in that, The outer edge of the extended structure does not exceed the outer edge of the base plate, and the outer edges of the web stiffener and the flange stiffener are flush with the outer edge of the base plate.

10. The externally exposed rigid joint column base according to claim 1, characterized in that, The base plate is anchored to the concrete foundation by high-strength bolts.

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