Exposed aseismatic steel column base structure

Abstract

The application relates to an exposed anti-seismic steel column foot structure. The application is suitable for the technical field of anti-seismic structures. The technical problem to be solved by the application is to provide an exposed anti-seismic steel column foot structure. The technical scheme adopted by the application is as follows: an exposed anti-seismic steel column foot structure comprises a steel column body provided with a column foot bottom plate at the bottom; at least one set of anti-seismic connecting pieces are symmetrically arranged at the column foot positions of the two sides of the steel column body, and the two ends of the anti-seismic connecting pieces respectively abut against the flange plates at the column foot positions of the steel column body and the column foot bottom plate; a fixing assembly is arranged on the anti-seismic connecting pieces and the column foot bottom plate, the two ends of the anti-seismic connecting pieces can be fixed on the flange plates at the column foot positions of the steel column body and the column foot bottom plate, and the column foot bottom plate can be fixed on the concrete foundation, so that the anti-seismic connecting pieces can bear the bending moment and the axial force at the column foot joint position of the steel column body.

Description

Technical Field

[0001] This utility model relates to the field of earthquake-resistant structure technology, and in particular to an exposed earthquake-resistant steel column base structure. Background Technology

[0002] In building structures, column bases are used to fix columns and transfer the load from the superstructure to the foundation; their load-bearing capacity is crucial to the safety of the entire building structure. Steel structure column bases are mainly divided into three types: exposed column bases, enclosed column bases, and embedded column bases. Exposed column bases are a commonly used type, widely used in industrial and civil buildings, especially in industrial steel plants.

[0003] When rigid connections are used, the column base needs to transmit the bending moment, axial force, and shear force from the steel column. Currently, exposed rigid column bases generally have a base plate welded to the bottom of the column, and the base plate is connected to the foundation using pre-embedded anchors. Due to the large bending moment borne by the column base under loads, especially lateral loads such as wind and seismic loads, larger anchors are used. Therefore, to prevent the base plate from yielding under the tension of the anchors, a thicker base plate is required, along with several stiffening plates dividing the base plate into several small sections, resulting in a large welding workload. This is especially true when using large-diameter anchors, requiring a very thick base plate. Due to on-site construction and installation requirements, the anchor holes in the base plate are much larger than the anchor diameter (generally diameter + 12mm or 1.5 times the anchor diameter). Therefore, thick washers (generally the same thickness as the base plate) should be used for the anchor nuts and the base plate diameter. After installation, the washers should be fully welded to the base plate around their perimeter. Due to the presence of thick base plates, numerous stiffening plates, and thick pads, the exposed steel column base structure is quite complex and requires a large amount of steel.

[0004] Common exposed steel column bases often have numerous stiffening plates and welds. Due to residual welding stress and the heat-affected zone, the welded joints of the stiffening plates have been prone to tearing during major earthquakes and tests, resulting in generally poor seismic performance of the column bases. The numerous welded connections also contribute to the column's weak plastic deformation capacity under seismic loads, necessitating improvements in its seismic performance. Summary of the Invention

[0005] The technical problem to be solved by this utility model is to provide an exposed seismic-resistant steel column base structure to address the above-mentioned problems.

[0006] The technical solution adopted in this utility model is: an exposed seismic-resistant steel column base structure, comprising: The steel column body has a column base plate at its bottom; At least one set of seismic connectors is symmetrically arranged at the column base on both sides of the steel column body, with its two ends respectively abutting against the flange plate and the base plate of the steel column body at the column base; The fixing component, located on the seismic connector and column base plate, can fix both ends of the seismic connector to the flange plate at the column base of the steel column body and the column base plate respectively, and fix the column base plate to the concrete foundation, so that the seismic connector can bear the bending moment and axial force at the column base node of the steel column body.

[0007] Through the above-mentioned technical means, the seismic connectors are fixed by fixed components in this structure, which reduces the amount of welding work. The seismic connectors connect the steel column body and the column base plate respectively, so that the seismic connectors can bear the bending moment and axial force at the column base node, thereby improving the seismic resistance of the column base node.

[0008] In some embodiments, the seismic connection includes a horizontal base plate, a vertical plate, and a stiffening plate. The horizontal base plate and the vertical plate are vertically connected to form an L-shaped structure. The two adjacent sides of the stiffening plate are respectively connected to the inner sides of the horizontal base plate and the vertical plate.

[0009] In some embodiments, the stiffening plate has an arc-shaped side away from the horizontal base plate and the vertical plate.

[0010] In some embodiments, the seismic connector is a single-piece rolled standard part without welds.

[0011] In some embodiments, the bottom of the column base plate is provided with a shear key, which is used to bear the shear force at the column base node of the steel column body.

[0012] In some embodiments, the fixing assembly includes a high-strength bolt, a positioning anchor, and a pre-embedded anchor. The high-strength bolt is used to fix the first end of the seismic connector to the flange plate at the base of the steel column body. The positioning anchor penetrates the base plate of the column and its end is at least partially inserted into the concrete foundation. The positioning anchor is used to fix the base plate of the column to the concrete foundation. The pre-embedded anchor penetrates the second end of the seismic connector and the base plate of the column and its end is at least partially inserted into the concrete foundation. The pre-embedded anchor is used to fix the second end of the seismic connector to the base plate of the column.

[0013] In some embodiments, the sum of the shear strengths of the high-strength bolts connected to the same flange of the steel column body is greater than the tensile yield load of the flange section in the steel column body.

[0014] In some embodiments, the sum of the tensile strengths of the pre-embedded anchors connected to the same seismic connector is greater than the tensile yield load of the flange section connecting the steel column body and the seismic connector.

[0015] In some embodiments, the yield strength of the steel used in the seismic connector is not less than 235 MPa.

[0016] Another technical solution adopted in this utility model is: an installation method for an exposed seismic-resistant steel column base structure, comprising the following steps: S1. Obtain the prefabricated steel column body, seismic connectors and column base plate from the factory; S2. Pre-set anchor bolt holes on the column base plate and bolt holes on the flange plate of the steel column body. Weld the column base plate to the bottom of the steel column body and weld shear keys to the bottom of the column base plate. S3. Pour the foundation concrete and install pre-embedded anchor bolts and positioning anchor bolts in the foundation concrete; S4. Hoist the steel column body to the predetermined position and use positioning anchor bolts to position the column base of the steel column body; S5. Perform secondary grouting and curing at the column base of the steel column body; S6. Fix the seismic connector to the flange plate at the base of the steel column body with high-strength bolts, and then fix the seismic connector to the pre-embedded anchor bolts.

[0017] The beneficial effects of this utility model are: 1. This structure, by fixing seismic connectors to the flange plates at the column base of the steel column body, effectively bears the bending moment and axial force at the column base joint, improving the seismic resistance of the joint area and thus possessing sufficient load-bearing capacity and structural safety. Since the column base plate no longer bears the responsibility of transmitting bending moment, plastic strands can form in the cantilever section. Therefore, a thinner material can be used for the column base plate while ensuring safety, reducing the thickness of the column base plate and thus lowering cost and weight.

[0018] 2. The seismic connectors in this structure consist of a horizontal base plate, vertical plates, and stiffening plates. The horizontal base plate and vertical plates form an L-shaped structure. The seismic connectors are made of integrally rolled standard parts, ensuring high strength and facilitating structural standardization and modularization. The absence of weld seams also reduces residual stress, minor defects, and the adverse effects of the heat-affected zone caused by welding. Furthermore, the seismic connectors and column base plates can also function as pads, eliminating the need for additional pads and reducing steel consumption.

[0019] 3. In this structure, high-strength bolts, pre-embedded anchors, and positioning anchors are used for fixing components. The high-strength bolts facilitate the installation of seismic connectors to the steel column body. The use of bolts and anchors not only ensures the reliability and load-bearing capacity of the connection points but also reduces on-site welding work, minimizes residual stress and heat-affected zones caused by welding, lowers the risks associated with inconsistent welding quality, and reduces the risk of weld tearing under seismic loads. Simultaneously, the pre-embedded and positioning anchors are deeply embedded in the concrete foundation, and shear keys are added to the column base plate to withstand shear forces; these combined features enhance the overall stability of the column base. Attached Figure Description

[0020] Figure 1 This is a front view structural diagram of this application.

[0021] Figure 2 This is a side view structural diagram of this application.

[0022] Figure 3 These are schematic diagrams of various forms of the structure of this application from top view.

[0023] Figure 4 This is a three-dimensional structural diagram of this application.

[0024] Figure 5 This is a three-dimensional structural diagram of the seismic connection component in this application.

[0025] Figure 6 This is the installation process for this application. Figure 1 .

[0026] Figure 7 This is the installation process for this application. Figure 2 .

[0027] Figure 8 This is the installation process for this application. Figure 3 .

[0028] Explanation of reference numerals in the attached figures: 1. Steel column body; 2. Seismic connectors; 3. Column base plate; 4. Embedded anchor bolts; 5. Positioning anchor bolts; 6. High-strength bolts; 7. Shear keys; 8. Vertical plate; 9. Horizontal base plate; 10. Stiffening plate.

[0029] This specification includes references to "one embodiment" or "implementation". The use of the phrase "in one embodiment" or "in an embodiment" does not necessarily refer to the same embodiment. Specific features, structures, or characteristics may be combined in any suitable manner consistent with this disclosure.

[0030] The term "comprising" is open-ended. As used in the appended claims, it does not exclude additional structures or steps. Detailed Implementation

[0031] To enable those skilled in the art to better understand the present invention, the technical solution of the present invention will be further described below with reference to specific embodiments.

[0032] Example 1: Combination Figures 1 to 5As shown, this embodiment is an exposed seismic-resistant steel column base structure, including a steel column body 1, at least one set of seismic connectors 2 and a fixing assembly. The bottom of the steel column body 1 is provided with a column base plate 3. A set of seismic connectors 2 are symmetrically provided at the column bases on both sides of the steel column body 1. The seismic connectors 2 are connected to the flange plate at the column base and the column base plate 3 at the column base of the steel column body 1 respectively through the fixing assembly. The fixing assembly also fixes the column base plate 3 to the concrete foundation, so that the seismic connectors 2 can bear the bending moment and axial force at the column base node of the steel column body 1.

[0033] In some implementation schemes, the seismic connector 2 includes a horizontal base plate 9, a vertical plate 8, and a stiffening plate 10. The horizontal base plate 9 and the vertical plate 8 are vertically connected to form an L-shaped structure. The two adjacent sides of the stiffening plate 10 are respectively connected to the inner sides of the horizontal base plate 9 and the vertical plate 8. Through the combination of the horizontal base plate 9, the vertical plate 8, and the stiffening plate 10, bending moment, axial force, and shear force can be more rationally borne by different components, thereby improving the safety and stability of the entire structure.

[0034] Furthermore, the stiffening plate 10 has an arc-shaped side away from the horizontal base plate 9 and the vertical plate 8. The use of an arc transition can reduce the adverse effects of stress concentration.

[0035] Furthermore, the seismic connector 2 is a seamless, integrally rolled standard part, which facilitates the standardization and modularization of the structure. In this embodiment, the seismic connector 2 is made of high-strength, high-ductility, and other high-performance steels. The design characteristics of the integral, seamless rolled standard part improve the seismic resistance of the joint and reduce the risk of weld tearing under seismic loads. The reduction in welding points not only reduces the amount of on-site welding work but also enhances the connection strength and overall stability between components.

[0036] Furthermore, the yield strength of the steel used in the seismic connector 2 shall not be less than 235 MPa.

[0037] Furthermore, regarding the dimensions of the seismic connector 2, theoretical analysis, finite element elastoplastic analysis, and experimental research are used to determine the material properties and specific dimensions of each component of the seismic connector 2 with different load-bearing capacities and seismic performance, so as to ensure excellent plastic deformation capacity and hysteretic energy dissipation capacity.

[0038] Furthermore, the bottom of the column base plate 3 is provided with a shear key 7, which is used to bear the shear force at the column base node of the steel column body 1. Specifically, in this embodiment, the column base plate 3 is welded to the bottom of the steel column body 1, and the steel column body 1 is located in the middle of the upper surface of the column base plate 3. The bottom surface of the column base plate 3 is welded with a shear key 7. By bearing part of the shear force through the shear key 7, the base plate design is optimized, the complex structure caused by the traditional thick base plate and stiffening plate 10 is simplified, the corresponding construction difficulty is reduced, and the amount of steel used is reduced.

[0039] Furthermore, since the column base plate 3 no longer bears the responsibility of transmitting bending moment, a plastic hinge line is allowed to form in the cantilever section. Therefore, a thinner thickness can be used, only about 10mm is needed to meet the structural requirements, which is much less than the thickness of the commonly used rigid column base plate 3. The thickness of the commonly used rigid column base plate 3 is greater than 20mm, and is commonly between 30 and 50mm. In this embodiment, the seismic connector 2 and the column base plate 3 can also serve as pads, eliminating the need for additional pads and simplifying the column base structure.

[0040] Furthermore, such as Figure 3 As shown, in this embodiment, multiple sets of seismic connectors 2 can be used, the specific number of which depends on the actual construction situation, so that various arrangement forms can be formed on both sides of the flange plate of the steel column body 1.

[0041] Furthermore, in this embodiment, the steel column body 1 is made of either I-beams or H-beams.

[0042] In some implementation schemes, the fixing components include high-strength bolts 6, positioning anchors 5, and pre-embedded anchors 4. The first end of the seismic connector 2 is the vertical plate 8, and the second end is the horizontal base plate 9. The high-strength bolts 6 pass through bolt holes in the vertical plate 8 and are used to fix the vertical plate 8 to the flange plate at the column base of the steel column body 1, so that the bending moment of the steel column body 1 is transferred to the seismic connector 2. The positioning anchors 5 pass through anchor holes in the column base plate 3. The top end of the positioning anchors 5 is fixed to the upper surface of the column base plate 3 by a nut, and the bottom end of the positioning anchors 5 extends at least partially into the concrete foundation. The positioning anchors 5 are used to fix the column base plate 3 to the concrete foundation, so that the column base plate 3 and the foundation concrete are integrally formed by the positioning anchors 5. The pre-embedded anchor bolt 4 passes through the anchor bolt holes on the horizontal base plate 9 and the column base plate 3. The top end of the pre-embedded anchor bolt 4 is fixed to the upper surface of the horizontal base plate 9 by a nut. The bottom end of the pre-embedded anchor bolt 4 is at least partially inserted into the concrete foundation. The pre-embedded anchor bolt 4 is used to fix the horizontal base plate 9 to the column base plate 3, so that the pre-embedded anchor bolt 4 can withstand axial loads.

[0043] Furthermore, the sum of the shear strengths of the high-strength bolts 6 connected to the same flange plate of the steel column body 1 is greater than the tensile yield load of the section of that flange plate in the steel column body 1.

[0044] Furthermore, the sum of the tensile strengths of the pre-embedded anchor bolts 4 connected to the same seismic connector 2 is greater than the tensile yield load of the flange section connecting the steel column body 1 and the seismic connector 2.

[0045] By using high-strength bolts 6, pre-embedded anchors 4, and positioning anchors 5 to replace a large amount of on-site welding work, the problems of residual stress and heat-affected zone caused by welding are reduced.

[0046] Furthermore, based on the stress characteristics of the seismic connector 2, and ensuring that the tensile strength of the anchor bolts is not less than that of the seismic connector 2, the corresponding anchor bolt parameters are determined. The quantity and specifications of the high-strength bolts 6 are determined based on the requirement that their shear resistance is not less than that of the seismic connector 2.

[0047] The implementation principle of an exposed seismic-resistant steel column base structure according to this utility model embodiment is as follows: The seismic connector 2, integrally rolled, is fixed to the flange plate at the base of the steel column using high-strength bolts 6, effectively transferring bending moment and axial force, thus improving the seismic resistance of the joint. Since the column base plate 3 no longer bears the responsibility of transferring bending moment, this function is transferred to the seismic connector 2, meaning that the column base plate 3 and the bottom shear key 7 are primarily responsible for bearing vertical loads and shear forces. Therefore, the stress distribution on the column base plate 3 changes, reducing high-stress areas caused by bending moment. The column base plate 3 can use thinner materials while ensuring safety, thereby reducing cost and weight. Simultaneously, allowing the formation of plastic hinges in the cantilever section means that the structure can absorb additional energy through localized plastic deformation when exceeding the elastic range, which helps improve the overall structural toughness and seismic performance. By optimizing the parameters of the seismic connector 2 to give it excellent plastic deformation and energy dissipation capabilities, the column base structure exhibits excellent seismic performance under seismic loads. Furthermore, on-site construction is simple, and the seismic connector 2 is a universal standard component, easily standardized.

[0048] Example 2: Combination Figures 6 to 8 As shown in the figure, this embodiment is an installation method for an exposed seismic-resistant steel column base structure, including the following steps: S1. Obtain the prefabricated steel column body 1, seismic connector 2, and column base plate 3 from the factory; S2. Anchor bolt holes are pre-set on the column base plate 3, bolt holes are pre-set on the flange plate of the steel column body 1, the column base plate 3 is welded to the bottom of the steel column body 1, and shear key 7 is welded to the bottom of the column base plate 3. S3. Pour the foundation concrete and install pre-embedded anchor bolts 4 and positioning anchor bolts 5 in the foundation concrete; S4. Hoist the steel column body 1 to the predetermined position and use the positioning anchor bolts 5 to position the column base of the steel column body 1. S5. Perform secondary grouting and curing at the column base of the steel column body 1; S6. Fix the seismic connector 2 to the flange plate at the column base of the steel column body 1 with high-strength bolts 6, and then fix the seismic connector 2 to the pre-embedded anchor bolts 4.

[0049] The above are all preferred embodiments of this utility model, and are not intended to limit the scope of protection of this utility model. Therefore, all equivalent changes made to the structure, shape and principle of this utility model should be covered within the scope of protection of this utility model.

Claims

1. An exposed seismic-resistant steel column base structure, characterized in that, include: The steel column body (1) has a column base plate (3) at its bottom. At least one set of seismic connectors (2) are symmetrically arranged at the column bases on both sides of the steel column body (1), with their ends respectively abutting the flange plate and the column base plate (3) at the column base of the steel column body (1). The fixing component is installed on the seismic connector (2) and the column base plate (3), which can fix the two ends of the seismic connector (2) to the flange plate at the column base of the steel column body (1) and the column base plate (3) respectively, and fix the column base plate (3) to the concrete foundation, so that the seismic connector (2) can bear the bending moment and axial force at the column base node of the steel column body (1).

2. The exposed seismic-resistant steel column base structure according to claim 1, characterized in that: The seismic connector (2) includes a horizontal base plate (9), a vertical plate (8) and a stiffening plate (10). The horizontal base plate (9) and the vertical plate (8) are vertically connected to form an L-shaped structure. The two adjacent sides of the stiffening plate (10) are respectively connected to the inner sides of the horizontal base plate (9) and the vertical plate (8).

3. The exposed seismic-resistant steel column base structure according to claim 2, characterized in that: The stiffening plate (10) is curved away from the horizontal base plate (9) and the side of the vertical plate (8).

4. The exposed seismic-resistant steel column base structure according to claim 2, characterized in that: The seismic connector (2) is a standard integral rolled part without weld seams.

5. The exposed seismic-resistant steel column base structure according to claim 1, characterized in that: The bottom of the column base plate (3) is provided with a shear key (7), which is used to bear the shear force at the column base node of the steel column body (1).

6. The exposed seismic-resistant steel column base structure according to claim 1, characterized in that: The fixing components include high-strength bolts (6), positioning anchors (5), and pre-embedded anchors (4). The high-strength bolts (6) are used to fix the first end of the seismic connector (2) to the flange plate at the base of the steel column body (1). The positioning anchors (5) penetrate the base plate (3) of the column base and at least partially extend into the concrete foundation. The positioning anchors (5) are used to fix the base plate (3) of the column base to the concrete foundation. The pre-embedded anchors (4) penetrate the second end of the seismic connector (2) and the base plate (3) of the column base and at least partially extend into the concrete foundation. The pre-embedded anchors (4) are used to fix the second end of the seismic connector (2) to the base plate (3).

7. The exposed seismic-resistant steel column base structure according to claim 6, characterized in that: The sum of the shear strengths of the high-strength bolts (6) connected to the same flange plate of the steel column body (1) is greater than the tensile yield load of the section of the flange plate in the steel column body (1).

8. The exposed seismic-resistant steel column base structure according to claim 6, characterized in that: The sum of the tensile strengths of the pre-embedded anchors (4) connected to the same seismic connector (2) is greater than the tensile yield load of the flange section of the steel column body (1) connected to the seismic connector (2).

9. The exposed seismic-resistant steel column base structure according to claim 1, characterized in that: The yield strength of the steel used in the seismic connector (2) shall not be less than 235 MPa.

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