CN107558666A - A kind of anti-buckling concrete filled steel tube coupled column of built-in circulating type tie hoop - Google Patents

Abstract

The invention discloses an anti-buckling steel pipe concrete composite column with built-in surrounding spiral stirrups and a construction method thereof. Concrete, the profiled steel plate encloses a tubular structure and is arranged inside the steel pipe, the surrounding spiral stirrup is arranged between the steel tube and the profiled steel plate, the adhesive coating is coated on the inner surface of the steel tube, The high-strength concrete is filled between the steel pipe and the tubular structure surrounded by the profiled steel plate, and the high-strength thin-wall steel pipe and the high-strength concrete are bonded through an adhesive coating. Through the synergistic effect of the adhesive and the surrounding spiral stirrup, the outward local buckling of the high-strength thin-walled steel pipe can be prevented, and at the same time, the circumferential cracking of the concrete caused by the joint deformation of the concrete and the steel pipe can be avoided, so as to ensure that the composite column can withstand earthquakes in any direction Both have good deformation ability.

Description

A Buckling-Resistant Steel Tube Concrete Composite Column with Built-in Surrounding Spiral Stirrups

technical field

The invention belongs to the technical field of building structures, and in particular relates to a buckling-resistant steel pipe concrete composite column with built-in surrounding spiral stirrups and a construction method thereof.

Background technique

The concrete-filled steel tube column is a new type of high-efficiency composite member developed in recent years, which consists of steel tubes and concrete inside the steel tubes. Through the exertion of combination, CFST can give full play to the material properties of both steel and concrete, so CFST columns have been more and more widely used in practical engineering. For CFST columns, under other conditions being the same, the higher the yield strength of the steel, the higher the bearing capacity of the column. Therefore, in the case of the same bearing capacity, the use of high-strength steel pipes can reduce the thickness of the steel pipe wall and save steel. However, when the wall thickness of the steel pipe is reduced in the high-strength CFST column, the stable bearing capacity of the steel pipe is also correspondingly reduced, so that the steel pipe of the composite column buckles outward before reaching the yield strength. In addition, for composite columns using high-strength concrete, the thin-walled high-strength steel pipes cannot effectively restrain the high-strength concrete inside the steel pipes, causing the high-strength concrete to exhibit brittle failure, resulting in insufficient deformation capacity of the composite columns.

Contents of the invention

The object of the present invention is to overcome the deficiencies in the prior art, and provide a buckling-resistant concrete-filled steel tube composite column with built-in surrounding spiral stirrups and a construction method thereof.

Technical scheme of the present invention is:

A buckling-resistant concrete-filled steel pipe composite column with built-in surrounding spiral stirrups, the composite column includes high-strength thin-walled steel pipes, adhesive coating, surrounding spiral stirrups, profiled steel plates and high-strength concrete, and the profiled steel plates surround The surrounding spiral stirrup is arranged between the steel pipe and the profiled steel plate, the adhesive coating is coated on the inner surface of the steel pipe, and the high-strength concrete is filled in the steel pipe and the steel pipe. Between the tubular structures surrounded by profiled steel plates, and the high-strength thin-walled steel pipes and high-strength concrete are bonded by an adhesive coating; the surrounding spiral stirrups are composed of several spiral stirrups, and these spiral The stirrups are welded at the ends to form a single piece.

Preferably, the high-strength thin-walled steel pipe is a rectangular steel pipe with a width-to-thickness ratio of 40 to 100; The average spacing is 1/4 to 1/5 of the column width.

Preferably, the surrounding spiral stirrups are eight spiral stirrups distributed in a rectangular shape along the steel pipe, the diameter of a single spiral stirrup is 1/5 to 1/6 of the column width, and the adjacent spiral stirrups on the same side The distance between the center points is 1/2 to 1/3 of the column width.

Preferably, the high-strength thin-walled steel pipe is a cold-formed, welded or seamless structural steel pipe.

Preferably, the profiled steel plate is open or closed, with a thickness of 0.8-1.2mm.

Preferably, the adhesive coating has a thickness of 5 mm to 10 mm.

Preferably, the binder is epoxy resin.

The construction method of the anti-buckling concrete filled steel pipe composite column with built-in surrounding spiral stirrup includes the following steps: enclosing the profiled steel plate into a tubular structure; coating the inner wall of the high-strength thin-walled steel pipe with an adhesive to form an adhesive coating, The adhesive is applied several times to ensure uniform coating thickness; the tubular structure formed by the profiled steel plate is arranged in the high-strength thin-walled steel pipe, and the welded integral spiral stirrup is arranged in the high-strength thin-walled steel pipe and the profiled Between the tubular structures surrounded by steel plates, high-strength concrete is poured between the tubular structures surrounded by high-strength thin-walled steel pipes and profiled steel plates until the concrete strength meets the requirements.

Compared with the prior art, the present invention has the following advantages and outstanding effects:

The outstanding features of the novel anti-buckling concrete-filled steel tube composite column with built-in surrounding spiral stirrups proposed by the present invention are that a layer of adhesive is applied between the steel pipe and high-strength concrete, and surrounding spiral stirrups are arranged between the inner and outer pipe walls. . The adhesive coating can effectively bond steel and concrete, prevent outward local buckling of high-strength thin-walled steel pipes, avoid column damage caused by local buckling of steel pipes, and improve the use efficiency of high-strength steel. The surrounding spiral stirrups can effectively restrain the concrete with a large force around the section, improve the situation that the thin-walled high-strength steel pipes in the composite column cannot restrain the high-strength concrete in the steel pipe, avoid the brittle failure of the high-strength concrete, and ensure that the composite column is in any It has good deformation ability under earthquake action in both directions. On the other hand, spiral stirrups can provide hoop tension to high-strength concrete, avoiding the hoop cracking of concrete caused by the co-deformation of concrete and steel pipes. In addition, the hollow column structure of the present invention can save material consumption and reduce the cost of the combined column under the premise of ensuring the bearing capacity of the component. To sum up, the present invention makes up for the shortcomings of ordinary high-strength steel-filled concrete columns, and has broad application prospects in high-rise buildings.

Description of drawings

Figure 1 is a cross-sectional view of a buckling-resistant concrete filled steel tube composite column with built-in wrap-around spiral stirrups;

Fig. 2 is the three-dimensional view of the anti-buckling steel pipe concrete composite column with built-in surrounding spiral stirrup;

Fig. 3 is the three-dimensional view of wrap-around spiral stirrup structure;

In the figure: 1-high-strength thin-walled steel pipe; 2-adhesive coating; 3-high-strength concrete; 4-circling spiral stirrup; 5-profiled steel plate.

detailed description

The specific implementation method of the present invention will be further described below in conjunction with the accompanying drawings.

Referring to Figures 1 and 2, a new buckling-resistant concrete-filled steel tube composite column with built-in surrounding spiral stirrups consists of high-strength thin-walled steel pipes 1, adhesive coating 2, surrounding spiral stirrups 4, profiled steel plates 5 and high-strength Concrete 3 composition. The high-strength thin-walled steel pipe 1 adopts a rectangular cross-section, which can be cold-formed, welded or seamless steel pipe, and has a width-to-thickness ratio of 40-100. The adhesive coating 2 can be epoxy resin or other high-efficiency adhesives, and the adhesive is evenly coated on the inner surface of the high-strength thin-walled steel pipe 1, and the thickness of the adhesive coating 2 is 5-10 mm. The profiled steel plate 5 is prefabricated in a factory and can be open or closed. The width of the steel plate is 1/2-1/3 of the column width, and the thickness of the steel plate is 0.8-1.2mm. The profiled steel plate 5 forms a rectangular tubular structure and is arranged inside the steel pipe 1, the surrounding spiral stirrup 4 is arranged between the steel tube 1 and the profiled steel plate 5, and the high-strength concrete 3 is filled in the steel pipe 1 and the profiled steel plate 5 to form a hollow composite column between the tubular structures, and the high-strength thin-walled steel pipe 1 and the high-strength concrete 3 are bonded through the adhesive coating 2. Referring to Fig. 3, the encircling spiral stirrup 4 is composed of eight spiral stirrups of the same size, and the eight spiral stirrups are welded at the ends to form a whole and distributed in a rectangular shape along the wall of the high-strength thin-walled steel pipe 1, The diameter of a single spiral stirrup is 1/5 to 1/6 of the column width, and the distance between the center points of adjacent spiral stirrups on the same side is 1/2 to 1/3 of the column width.

Construction method of the present invention is:

Firstly, the ends of four profiled steel plates 5 are welded in pairs to form a steel pipe with a rectangular outline. Next, an adhesive is coated on the inner wall of the high-strength thin-walled steel pipe 1 to form an adhesive coating 2, and the adhesive should be applied twice to ensure uniform thickness of the coating. Next, arrange the steel pipe with rectangular outline in the high-strength thin-walled steel pipe 1, the center of the section of the steel pipe with rectangular outline is the center of the section of high-strength thin-walled steel pipe 1, and the average distance between the steel pipe with rectangular outline and the high-strength thin-walled steel pipe is 1/4~ of the column width 1/5. Next, the integrally welded encircling spiral stirrup 4 is arranged between the high-strength thin-walled steel pipe 1 and the rectangular profile steel pipe according to a predetermined design. Finally, pour high-strength concrete 3 between the two steel pipes, and when the strength of the concrete 3 reaches the requirement, the construction of the present invention is completed to form a hollow composite column.

In the present invention, steel and concrete can be effectively bonded through the adhesive coating to prevent outward local buckling of high-strength thin-walled steel pipes and avoid column damage caused by local buckling of steel pipes. The bonding strength of the adhesive itself is greater than the tensile strength of the concrete. In this case, the concrete may be cracked in the circumferential direction when the force is applied. The surrounding spiral stirrup can provide a circumferential tensile force for the high-strength concrete, avoiding the tension between the concrete and the steel pipe. The circumferential cracking of the concrete caused by the collaborative deformation can effectively restrain the reinforced concrete around the cross-section, which improves the situation that the thin-walled high-strength steel pipes in the composite column are not well restrained by the high-strength concrete in the steel pipes.

The above-mentioned embodiments are only used to further illustrate a buckling-resistant concrete-filled steel pipe composite column with built-in surrounding spiral stirrups of the present invention and its construction method, but the present invention is not limited to the embodiments. Any simple modifications, equivalent changes and modifications made in the embodiments all fall within the protection scope of the technical solution of the present invention.

Claims (8)

1. A buckling-resistant concrete-filled steel tube composite column with built-in wrap-around spiral stirrups is characterized in that: the composite column includes high-strength thin-walled steel pipes, adhesive coating, wrap-around spiral stirrups, profiled steel plates and high-strength concrete, The profiled steel plate forms a tubular structure and is arranged inside the steel pipe, the surrounding spiral stirrup is arranged between the steel tube and the profiled steel plate, the adhesive coating is coated on the inner surface of the steel tube, the High-strength concrete is filled between the steel pipe and the tubular structure surrounded by the profiled steel plate, and the high-strength thin-walled steel pipe and the high-strength concrete are bonded by an adhesive coating; the surrounding spiral stirrup is composed of several spiral stirrups These spiral stirrups are formed into a whole by end welding. 2. The anti-buckling concrete filled steel tube composite column with built-in surrounding spiral stirrups according to claim 1, characterized in that: the high-strength thin-walled steel tube is a rectangular steel tube with a width-to-thickness ratio of 40 to 100; It is formed into a rectangular tubular structure and arranged concentrically with the high-strength thin-walled steel pipe, and the average distance between the rectangular tubular structure and the high-strength thin-walled steel pipe is 1/4 to 1/5 of the column width. 3. The anti-buckling concrete filled steel pipe composite column with built-in wrap-around spiral stirrups according to claim 2, characterized in that: the wrap-around spiral stirrups are eight spiral stirrups distributed in a rectangular shape along the steel pipe, each The diameter of the spiral stirrup is 1/5 to 1/6 of the column width, and the distance between the center points of adjacent spiral stirrups on the same side is 1/2 to 1/3 of the column width. 4. The anti-buckling steel pipe concrete composite column with built-in surrounding spiral stirrup according to claim 1, characterized in that: the high-strength thin-walled steel pipe is a steel pipe for cold bending, welding or seamless structure. 5. The anti-buckling concrete filled steel pipe composite column with built-in surrounding spiral stirrups according to claim 1, characterized in that: the profiled steel plate is an open type or a closed type, and the thickness is 0.8-1.2mm. 6 . The anti-buckling concrete filled steel pipe composite column with built-in surrounding spiral stirrup according to claim 1 , characterized in that: the thickness of the adhesive coating is 5 mm to 10 mm. 7. The anti-buckling concrete filled steel pipe composite column with built-in surrounding spiral stirrups according to claim 1, characterized in that: the binder is epoxy resin. 8. According to any one of claims 1 to 7, the construction method of the buckling-resistant concrete filled steel pipe composite column with built-in surrounding spiral stirrups is characterized in that it includes the following steps: enclosing the profiled steel plate into a tubular structure; The inner wall of the wall steel pipe is coated with an adhesive to form an adhesive coating, and the adhesive is applied several times to ensure a uniform coating thickness; the tubular structure formed by the profiled steel plate is arranged in a high-strength thin-wall steel pipe, and the welded The integral surrounding spiral stirrup is arranged between the tubular structure surrounded by high-strength thin-walled steel pipe and profiled steel plate, and high-strength concrete is poured between the tubular structure surrounded by high-strength thin-walled steel tube and profiled steel plate until the concrete strength meets the requirements .