Rectangular steel pipe concrete combination column structure

Abstract

The utility model relates to the technical field of steel pipe columns, and particularly provides a rectangular steel pipe concrete combination column structure which comprises a circular steel pipe, a steel plate and concrete. The four round steel pipes are distributed in a rectangular array; each round steel pipe is vertically arranged; the four round steel pipes are connected in series through the four steel plates to form a closed hollow cylindrical structure; and concrete is poured into the circular steel pipe and the hollow columnar structure. The rectangular concrete-filled steel tube combination column structure has the advantages of steel and concrete, is light in dead weight, high in strength, convenient to construct and good in anti-seismic property, can further improve the bearing capacity by arranging the round steel tubes at the four corners, reduces the steel consumption on the premise of meeting the stress requirement, is obvious in economic benefit, and is suitable for popularization and application. The device is suitable for being widely popularized and used in steel structure houses.

Description

Technical Field

[0001] The utility model belongs to the technical field of steel tube columns, and in particular relates to a rectangular steel tube concrete composite column structure. Background Art

[0002] Currently, in circular concrete-filled steel tube structures, the steel tube constrains the concrete, placing the concrete inside the tube in a state of complex stress (triaxial stress). This increases the strength of the concrete, significantly improving its plasticity and toughness. At the same time, the concrete inside the tube supports the steel tube, helping to improve its stability and delay or prevent local buckling. Therefore, concrete-filled steel tube structures can fully utilize the characteristics of both steel and concrete, and boast advantages such as light weight, high strength, ease of construction, and good seismic resistance. They have been widely used in multi-story building construction projects.

[0003] Compared to circular concrete-filled steel tube (CFST) columns, rectangular concrete-filled steel tube (CFST) columns (box columns) have the advantages of easy steel tube fabrication, simple joint structure, easy connection to beams, convenient construction, easy conformity to building plan requirements, relatively open cross-sections with large moments of inertia, and suitability for use as compression-bending members. Consequently, they are increasingly widely used in engineering practice. However, the overall confinement effect of rectangular steel tubes on the core concrete is weak, and this effect decreases with increasing column cross-sectional size. This is primarily due to the fact that the confinement effect of rectangular steel tubes on the core concrete is limited to the corners, while the central perimeter is a weak confinement zone. Furthermore, when the height-to-thickness ratio of the steel tube exceeds a certain limit, the longitudinal compression steel plate is prone to local buckling, leading to premature failure of the member. Consequently, the bearing capacity and ductility of rectangular concrete-filled steel tube columns are lower than those of circular concrete-filled steel tube columns under the same conditions. Utility Model Content

[0004] In response to the problems existing in the above-mentioned existing construction technology, the utility model provides a rectangular steel tube concrete composite column structure, which combines round steel tubes and steel plates to form a rectangular steel-concrete column structure, thereby improving the bearing capacity of the steel column while reducing the amount of steel used.

[0005] The utility model proposes a rectangular steel tube concrete composite column structure, comprising: a circular steel tube, a steel plate and concrete; four circular steel tubes are distributed in a rectangular array; each circular steel tube is arranged upright; four steel plates connect the four circular steel tubes in series to form a closed hollow columnar structure; the interiors of the circular steel tubes and the hollow columnar structure are both poured with concrete.

[0006] Furthermore, both ends of the steel plate are inclined surfaces, which are respectively fitted with the outer walls of the two round steel pipes.

[0007] Furthermore, each of the circular steel tubes is connected to two perpendicular steel plates.

[0008] Furthermore, a rib is provided inside the hollow columnar structure; two ends of the rib are respectively connected to the two oppositely arranged steel plates.

[0009] Furthermore, the outer diameter of the round steel pipe is greater than or equal to 50 mm.

[0010] Furthermore, the wall thickness of the steel plate is greater than or equal to the wall thickness of the round steel tube.

[0011] Furthermore, the strength grade of the concrete is greater than or equal to C30.

[0012] Furthermore, the outer wall surface of the steel plate is tangent to the outer walls of the round steel tubes at both ends thereof.

[0013] The beneficial effects of the present invention are as follows: the circular steel tube has a restraining effect on the internal concrete, which can improve the overall load-bearing capacity. Under the same load-bearing capacity, the thickness of the column is thinner and the steel consumption is less than that of a conventional box-type column. The structure enclosed by the circular steel tube and steel plate is approximately rectangular, which simplifies connection with the infill wall and steel beam, and also facilitates the construction of the exterior finishing layer. The connection between the circular steel tube and the steel plate can be welded, which is a mature construction technology and reliable connection. The rectangular steel tube concrete composite column structure of the present invention combines the advantages of both steel and concrete, with light weight, high strength, easy construction, and good seismic performance. The installation of circular steel tubes at the four corners can further enhance its load-bearing capacity, reduce steel consumption while meeting the load requirements, and has significant economic benefits. It is suitable for widespread use in steel-structured residential buildings. Compared with conventional box-type columns, while meeting the maximum width-to-thickness ratio, the web thickness of the composite column can be reduced by nearly half. While maintaining the same moment of inertia, the cross-sectional steel consumption of the composite column can be reduced by more than 20%. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 This is a structural schematic diagram of a rectangular steel tube concrete composite column structure of the present utility model.

[0015] Figure 2 for Figure 1 Schematic diagram of the structure of a steel plate.

[0016] Figure 3 for Figure 1 Schematic diagram of the structure after ribs are set inside the hollow cylindrical structure.

[0017] In the figure: 1- round steel pipe; 2- steel plate; 3- concrete; 4- rib plate. DETAILED DESCRIPTION

[0018] The following is a further detailed description of this application with reference to the accompanying drawings and specific implementations:

[0019] like Figure 1A rectangular steel tube concrete composite column structure is shown, comprising:

[0020] Four round steel tubes 1 are distributed in a rectangular array at the four corners of the composite column structure. In addition to constituting the overall structure of the composite column, the round steel tubes 1 also serve to constrain the concrete inside, thereby improving the overall bearing capacity of the composite column.

[0021] Four steel plates 2 and four round steel tubes 1 are respectively connected between every two steel plates 2, so that the four round steel tubes 1 and the four steel plates 2 can be fastened and welded to form a closed hollow columnar structure for restraining the internal concrete.

[0022] Concrete 3 is filled and poured into the interior of the circular steel tube 1 and the interior of the closed hollow columnar structure surrounded by the circular steel tube 1 and the steel plate 2, and is used to support the circular steel tube 1 and the hollow columnar structure and improve their stability.

[0023] Circular steel tubes 1 are positioned at the four corners of the hollow cylindrical structure, with each pair of adjacent circular steel tubes 1 arranged symmetrically about the structure's axis of symmetry. Steel plates 2 are positioned along the four right-angled sides of the hollow cylindrical structure, with the left and right ends of the outer wall of the steel plates 2, facing away from the interior of the hollow cylindrical structure, tangent to the outer sides of the circular steel tubes 1. Concrete 3 is poured inside the circular steel tubes 1 and the hollow cylindrical structure. The circular steel tubes 1 and steel plates 2 are cast with concrete 3 to form a solid, integrated composite column structure.

[0024] like Figure 1 、 Figure 2 As shown, both ends of the steel plate 2 are beveled at an angle of 45°, so that the ends of the steel plate 2 are tightly connected to the outer wall of the round steel pipe 1, thereby facilitating welding operations.

[0025] At the connection position between the round steel tube 1 and the steel plate 2, the tangent line of the outer wall of the round steel tube 1 is collinear with the outer wall of the steel plate 2 connected thereto, so that neither the round steel tube 1 nor the steel plate 2 protrudes from the outer contour of the rectangular composite column structure, thereby forming a regular cross-sectional shape, which easily meets the requirements of the building plan layout.

[0026] The two steel plates 2 connected to the same round steel pipe 1 are arranged at 90 degrees.

[0027] The wall thickness of the steel plate 2 is not less than the wall thickness of the round steel pipe 1 , the wall thickness of the steel plate 2 is not less than 4 mm, and the wall thickness of the round steel pipe 1 is not less than 4 mm.

[0028] According to the changes in the required layout of the building, the cross section of the hollow columnar structure can be rectangular or square. When the sizes of the four steel plates 2 are completely consistent, the hollow columnar structure is a column structure with a square cross section.

[0029] The minimum dimension of the short side of the rectangular composite column structure section is not less than 150 mm to ensure that the composite column structure still has certain mechanical properties outside its plane and to leave sufficient space for the pouring of concrete 3 and the vibration work after pouring.

[0030] The outer diameter of the round steel pipe 1 is not less than 50 mm, which ensures that the concrete 3 can be poured into the round steel pipe 1 smoothly while also allowing the round steel pipe 1 to truly play its role in improving the bearing capacity of the composite column structure.

[0031] The steel plates 2 and round steel tubes 1 are made of one or more grades of steel selected from Q235, Q355, Q390, Q420, Q460, and Q345GJ. When using multiple grades of steel, the difference between the highest and lowest grades should be no more than one grade to avoid instability in the overall mechanical properties of the composite column structure due to differences in mechanical properties such as strength, toughness, and plasticity between different steel grades.

[0032] The strength grade of the cast-in concrete 3 for the composite column structure shall be no less than C30. For circular steel tubes 1 and steel plates 2 made of Q235 steel, concrete with a strength grade of C30-C40 shall be used for pouring. For circular steel tubes 1 and steel plates 2 made of Q355 steel, concrete with a strength grade of C40-C60 shall be used for pouring. For circular steel tubes 1 and steel plates 2 made of Q390, Q420, and Q460 steel, concrete with a strength grade of no less than C50 shall be used for pouring. When circular steel tubes 1 and steel plates 2 are made of different steel grades, the higher grade shall prevail.

[0033] like Figure 3 As shown, in order to improve the structural strength, a rib plate 4 is further provided inside the hollow columnar structure; both ends of the rib plate 4 are respectively connected to the two oppositely arranged steel plates 2, and the rib plate 4 divides the internal space of the hollow columnar structure into two parts, left and right.

[0034] The specific method of the composite column structure of the utility model is:

[0035] The manufacturer prefabricates or purchases round steel tubes 1, steel plates 2, and concrete 3. The dimensions and steel grades of the round steel tubes 1 and steel plates 2, and the strength grade and mix ratio of the concrete 3 are provided by professional designers.

[0036] Step S1: Figure 2 As shown, four steel plates 2 of a certain thickness are beveled at both ends at an angle of 45°;

[0037] Step S2: Weld the four steel plates 2 and the four round steel pipes 1 together. Figure 1 The hollow cylindrical structure is formed into a rectangular shape.

[0038] Step S3: Use concrete 3 to pour, vibrate and cure the circular steel pipe 1 and the interior of the hollow column structure, so that the circular steel pipe 1, the steel plate 2 and the concrete 3 together form a solid integrated composite column structure.

[0039] In the specific implementation, in order to meet the structural calculation requirements, such as Figure 3 As shown, in step S2, an additional rib plate 4 can be welded in the middle of the hollow columnar structure, parallel to its short side. The rib plate can alleviate the adverse effects of the weak constraint zone in the middle part of the rectangular steel tube, enhance the overall constraint effect of the rectangular steel tube on the core concrete, and prevent local buckling of the longitudinal compression steel plate, which may lead to premature failure of the component.

[0040] The above are only preferred embodiments of the present invention. The scope of protection of the present invention is not limited to the above embodiments. All technical solutions based on the concept of the present invention are within the scope of protection of the present invention. It should be pointed out that for those skilled in the art, various improvements and modifications that do not depart from the principles of the present invention should also be considered within the scope of protection of the present invention.

Claims

1. A rectangular steel tube concrete composite column structure, characterized in that: include: Round steel pipes, steel plates and concrete; the four round steel pipes are distributed in a rectangular array; each round steel pipe is arranged upright; the four steel plates connect the four round steel pipes in series to form a closed hollow columnar structure; the interiors of the round steel pipes and the hollow columnar structure are both poured with concrete.

2. The rectangular steel tube concrete composite column structure according to claim 1, characterized in that: Both ends of the steel plate are inclined surfaces, which are respectively fitted with the outer walls of the two round steel pipes.

3. The rectangular steel tube concrete composite column structure according to claim 1, characterized in that: Two perpendicular steel plates are connected to each of the circular steel pipes.

4. The rectangular steel tube concrete composite column structure according to claim 1, characterized in that: A rib is further provided inside the hollow columnar structure; two ends of the rib are respectively connected to the two oppositely arranged steel plates.

5. The rectangular steel tube concrete composite column structure according to claim 1, characterized in that: The outer diameter of the round steel pipe is greater than or equal to 50 mm.

6. The rectangular steel tube concrete composite column structure according to claim 1, characterized in that: The wall thickness of the steel plate is greater than or equal to the wall thickness of the round steel tube.

7. The rectangular steel tube concrete composite column structure according to claim 1, characterized in that: The strength grade of the concrete is greater than or equal to C30.

8. The rectangular steel tube concrete composite column structure according to claim 1, characterized in that: The outer wall surface of the steel plate is tangent to the outer walls of the round steel pipes at both ends thereof.

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