Connecting structure of concrete filled steel tubular column and floor slab

Abstract

The utility model discloses a connecting structure of a concrete-filled steel tubular column and a floor slab, which comprises the concrete-filled steel tubular column, the top of the concrete-filled steel tubular column is fixedly connected with an annular steel plate column head, and the annular steel plate column head horizontally extends outwards and exceeds the outer wall of the concrete-filled steel tubular column; the ring beam is arranged on the outer side of the annular steel plate column head in a surrounding mode and connected with the floor slab in an overall pouring mode; the thickened floor slab area is located over the annular steel plate column head, the thickness of the thickened floor slab area is larger than that of other areas of the floor slab, and multiple layers of bidirectional reinforcing meshes are arranged in the thickened floor slab area; longitudinal steel bars of the hidden beam are anchored in the ring beam, a bending moment transmission path is formed through the ring beam and the concrete-filled steel tubular column, a rigid connection joint is formed through full penetration welding of the annular steel plate column head and the concrete-filled steel tubular column, and the bearing capacity and rigidity of a column top area are effectively improved.

Description

Technical Field

[0001] This utility model relates to the field of connecting steel-concrete composite columns and floor slabs. More specifically, this utility model relates to a connection structure between steel-concrete composite columns and floor slabs. Background Technology

[0002] In the connection structure between steel-concrete composite columns and floor slabs, traditional connection methods typically involve direct casting or simple steel plate transitions, which suffer from insufficient moment transfer and inadequate joint stiffness. Due to the material property differences between the steel-concrete composite columns and reinforced concrete floor slabs, stress concentration is prone to occur at the connection, leading to localized cracking or deformation, affecting the overall integrity and seismic performance of the structure. Utility Model Content

[0003] To achieve these objectives and other advantages according to the present invention, a preferred embodiment of the present invention provides a connection structure between a steel-concrete composite column and a floor slab, comprising:

[0004] A steel-concrete composite column, with a ring-shaped steel plate column head fixedly connected to its top, the ring-shaped steel plate column head extending horizontally outward and beyond the outer wall of the steel-concrete composite column.

[0005] The ring beam is set around the outside of the annular steel plate column head and is integrally cast and connected to the floor slab.

[0006] The thickened floor slab area is located directly above the annular steel plate column head. Its thickness is greater than that of the rest of the floor slab, and it is equipped with multiple layers of two-way steel mesh inside.

[0007] The hidden beam has its longitudinal reinforcement anchored inside the ring beam, and forms a bending moment transfer path with the steel-concrete composite column through the ring beam.

[0008] Preferably, the thickness of the annular steel plate column head is 10-30mm, its outer edge extends 50-150mm beyond the outer wall of the steel-concrete composite column, and it is fixedly connected to the top of the steel-concrete composite column through a full penetration weld.

[0009] Preferably, the cross-section of the ring beam is rectangular, and its height is 1.5-2 times the thickness of the floor slab. The ring beam is provided with closed stirrups and longitudinal steel bars, and the longitudinal steel bars are lapped or welded to the longitudinal steel bars of the concealed beam.

[0010] Preferably, the thickness of the thickened floor slab area is 1.2-1.8 times the thickness of the floor slab, and its range extends outward from the center of the steel-concrete composite column by 1.5-2 times the column diameter, and the multi-layer bidirectional steel mesh is connected into a whole by vertical tie bars.

[0011] Preferably, the anchorage length of the longitudinal reinforcing bars of the concealed beam extending into the ring beam is not less than 35 times the diameter of the reinforcing bars, and the ends are provided with hooks, which are tied and fixed to the longitudinal reinforcing bars of the ring beam.

[0012] Preferably, the multi-layer bidirectional steel mesh includes at least two layers of horizontal steel mesh with a layer spacing of 50-100mm. The diameter of the steel bars in each layer is not less than 10mm and the spacing is not greater than 200mm. The bottom layer of steel mesh is connected to the annular steel plate column head by studs.

[0013] This utility model offers at least the following advantages: The connection between the steel-concrete composite column and the floor slab provided by this utility model forms a rigid connection node through full penetration welding of the annular steel plate column head and the steel-concrete composite column, effectively improving the bearing capacity and stiffness of the column top area; the ring beam ensures reliable transmission of bending moment, and the reasonable configuration of its internal closed stirrups and longitudinal reinforcement enhances the shear resistance of the node; the thickened floor slab area, combined with the design of multi-layer bidirectional steel mesh, significantly improves the bending and shear resistance of the floor slab in the column top area, avoiding localized damage caused by stress concentration; the standardized anchorage of the longitudinal reinforcement of the concealed beam ensures a reliable connection with the ring beam, forming a continuous force transmission path; the multi-layer steel mesh, connected to the annular steel plate column head by studs, enhances the overall collaborative performance. This structure has strong integrity and a clear force transmission path, effectively coordinating the deformation of the steel-concrete composite column and the reinforced concrete floor slab, significantly improving the seismic performance and durability of the node, and is suitable for high-rise buildings and large-span structures.

[0014] 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

[0015] Figure 1 This is a schematic diagram of the connection structure between the steel-concrete composite column and the floor slab in this utility model.

[0016] Figure 2 for Figure 1 sectional view of aa.

[0017] Figure 3 for Figure 1 BB sectional view. Detailed Implementation

[0018] 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.

[0019] 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.

[0020] 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.

[0021] 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.

[0022] like Figure 1-3 As shown, a preferred embodiment of this utility model provides a connection structure between a steel-concrete composite column and a floor slab, comprising:

[0023] A steel-concrete composite column 1 has an annular steel plate column head 2 fixedly connected to its top. The annular steel plate column head 2 extends horizontally outward and beyond the outer wall of the steel-concrete composite column 1.

[0024] Ring beam 3 is set around the outside of the annular steel plate column head 2 and is integrally cast and connected to the floor slab 4;

[0025] Thickened floor slab area 5 is located directly above the annular steel plate column head 2. Its thickness is greater than that of the rest of the floor slab 4, and it is equipped with multiple layers of bidirectional steel mesh inside.

[0026] The hidden beam 7 has its longitudinal reinforcing bars 71 anchored within the ring beam 3, and forms a bending moment transfer path with the steel-concrete composite column 1 through the ring beam 3.

[0027] In the above technical solution, the synergistic effect of the annular steel plate column head, ring beam, thickened floor slab area, and concealed beam forms multiple force transmission paths, significantly improving the stiffness and load-bearing capacity of the joint. The annular steel plate column head enhances the bending resistance of the column top, the ring beam ensures effective transfer of bending moment to the floor slab, the thickened floor slab area improves local shear resistance, and the concealed beam further strengthens the overall integrity of the joint. This structure is suitable for high-rise buildings and large-span structures, exhibits excellent seismic performance, is convenient to construct, and effectively avoids joint damage.

[0028] Under load, the bending moment of floor slab 4 is transferred to ring beam 3 through the multi-layer steel mesh of the thickened floor slab area 5. Ring beam 3 then transfers the force to the main structure through its connection with the steel-concrete composite column 1. The longitudinal reinforcement 71 of the concealed beam 7 works together with ring beam 3 to form a continuous force transmission path. The annular steel plate column head 2 expands the connection area and effectively disperses local stress.

[0029] In another technical solution, the thickness of the annular steel plate column head 2 is 10-30mm, its outer edge extends 50-150mm beyond the outer wall of the steel-concrete composite column 1, and it is fixedly connected to the top of the steel-concrete composite column 1 through a full penetration weld.

[0030] By limiting the thickness (10-30mm) and overhang length (50-150mm) of the annular steel plate column head and employing full penetration welds, the joint is ensured to have sufficient rigidity and strength, avoiding weld cracking or steel plate deformation caused by localized stress concentration. This design effectively disperses column top stress, improves the durability and seismic performance of the joint, and is suitable for building structures in high-intensity earthquake zones.

[0031] In another technical solution, the cross-section of the ring beam 3 is rectangular, and its height is 1.5-2 times the thickness of the floor slab 4. The ring beam 3 is provided with closed stirrups 31 and longitudinal steel bars, and the longitudinal steel bars are lapped or welded to the longitudinal steel bars of the hidden beam 7.

[0032] The height of the ring beam (1.5-2 times the floor slab thickness) and the reinforcement method (closed stirrups + longitudinal reinforcement) ensure sufficient bending and shear resistance. The lap or welding of the longitudinal reinforcement with the concealed beam reinforcement further strengthens the overall integrity of the joint, making moment transfer more reliable. This design effectively prevents ring beam cracking or reinforcement slippage, improving the overall stability and seismic performance of the structure.

[0033] In another technical solution, the thickness of the thickened floor slab area 5 is 1.2-1.8 times the thickness of the floor slab 4, and its range extends outward from the center of the steel-concrete composite column 1 by 1.5-2 times the column diameter.

[0034] Thickened floor slabs (1.2-1.8 times the original floor slab thickness, ranging from 1.5-2 times the column diameter) combined with multi-layer bidirectional steel mesh and vertical tie bars significantly improve the shear and bending resistance of the floor slab at the column top. This design effectively prevents floor slab cracking or localized damage and is suitable for floor slab structures with large loads or long spans, enhancing the overall integrity and durability of the structure.

[0035] In another technical solution, the longitudinal steel bar 71 of the hidden beam 7 extends into the ring beam 3 with an anchorage length of not less than 35 times the diameter of the steel bar, and the end is provided with a 90° hook 72, which is tied and fixed to the longitudinal steel bar 32 of the ring beam 3.

[0036] Thickened floor slabs (1.2-1.8 times the original floor slab thickness, ranging from 1.5-2 times the column diameter) combined with multi-layer bidirectional steel mesh and vertical tie bars significantly improve the shear and bending resistance of the floor slab at the column top. This design effectively prevents floor slab cracking or localized damage and is suitable for floor slab structures with large loads or long spans, enhancing the overall integrity and durability of the structure.

[0037] In another technical solution, the multi-layer bidirectional steel mesh includes at least two layers of horizontal steel mesh with a layer spacing of 50-100mm. The diameter of the steel bars in each layer is not less than 10mm and the spacing is not greater than 200mm. The bottom layer of steel mesh is connected to the annular steel plate column head 2 by studs.

[0038] Multi-layered bidirectional steel mesh is connected by vertical tie bars and studs to form an integrated load-bearing system, improving the shear and bending resistance of the floor slab. Studs connect the bottom layer of steel mesh to the annular steel plate column head, further enhancing the synergistic effect, preventing slippage or separation of the steel mesh, and ensuring the uniformity and reliability of the stress on the floor slab in the column top area.

[0039] 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 connecting structure of a concrete filled steel tubular column and a floor, characterized by, include: A steel-concrete composite column, with a ring-shaped steel plate column head fixedly connected to its top, the ring-shaped steel plate column head extending horizontally outward and beyond the outer wall of the steel-concrete composite column. The ring beam is set around the outside of the annular steel plate column head and is integrally cast and connected to the floor slab. The thickened floor slab area is located directly above the annular steel plate column head. Its thickness is greater than that of the rest of the floor slab, and it is equipped with multiple layers of two-way steel mesh inside. The hidden beam has its longitudinal reinforcement anchored inside the ring beam, and forms a bending moment transfer path with the steel-concrete composite column through the ring beam.

2. The connection structure of a concrete-filled steel tubular column to a floor slab according to claim 1, characterized in that, The thickness of the annular steel plate column head is 10-30mm, and its outer edge extends 50-150mm beyond the outer wall of the steel-concrete composite column. It is fixedly connected to the top of the steel-concrete composite column through a full penetration weld.

3. The connection structure of a concrete-filled steel tubular column to a floor slab according to claim 1, characterized in that, The ring beam has a rectangular cross-section and its height is 1.5-2 times the thickness of the floor slab. The ring beam is equipped with closed stirrups and longitudinal steel bars, and the longitudinal steel bars are lapped or welded to the longitudinal steel bars of the concealed beam.

4. The connection structure of a concrete-filled steel tubular column to a floor slab according to claim 1, characterized in that, The thickness of the thickened floor slab area is 1.2-1.8 times the thickness of the floor slab, and its range extends outward from the center of the steel-concrete composite column by 1.5-2 times the column diameter.

5. The connection structure between the steel-concrete composite column and the floor slab according to claim 1, characterized in that, The longitudinal reinforcing bars of the concealed beam have an anchorage length of not less than 35 times the diameter of the reinforcing bars extending into the ring beam, and the ends are provided with hooks, which are tied and fixed to the longitudinal reinforcing bars of the ring beam.

6. The connection structure of a concrete-filled steel tubular column to a floor slab according to claim 1, characterized in that, The multi-layer bidirectional steel mesh includes at least two layers of horizontal steel mesh with a layer spacing of 50-100mm. The diameter of the steel bars in each layer is not less than 10mm and the spacing is not greater than 200mm. The bottom layer of steel mesh is connected to the annular steel plate column head by studs.

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