CN206091077U - Confined concrete combination column - Google Patents

Abstract

The utility model discloses a constrained concrete composite column, which comprises a square steel tube column, a U-shaped steel tube column, an L-shaped steel tube column and a concrete column. U-shaped steel pipe columns are welded, and L-shaped steel pipe columns are sequentially welded along the adjacent sides of the U-shaped steel pipe columns to form a steel pipe bundle. Finally, concrete is filled in each square steel pipe column of the steel pipe bundle to form a constrained concrete composite column. The utility model overcomes the disadvantages of poor ductility and energy dissipation capacity of the traditional reinforced concrete column, and at the same time improves the section form of the steel pipe concrete, thus greatly improving its bearing capacity and application range. It is convenient for construction, greatly improves the anti-seismic performance of the column, and is suitable for application in high-rise buildings and buildings in areas with high seismic intensity.

Description

Confined Concrete Composite Column

technical field

The utility model relates to a novel steel-concrete composite column, in particular to a novel constrained concrete composite column.

Background technique

Column is an indispensable key component in all building structure systems, and has always been the key component of civil engineering scholars at home and abroad. At present, a lot of research work has been carried out on reinforced concrete columns and steel tube concrete columns. It has become one of the main directions of column research to increase the bearing capacity of components and improve the mechanical properties of columns by improving the performance of column reinforcement or steel pipes. In recent years, the vast majority of structures in my country still use reinforced concrete columns, but studies have shown that although the comprehensive performance of reinforced concrete columns has been improved under various new reinforcement schemes, the comprehensive seismic performance and shear damage are serious. The amount of stirrups and the form of reinforcement are limited to improve the ductility and shear resistance of the coupling beam, and the construction is complicated and the reinforcement configuration is relatively dense, which is not conducive to the pouring of concrete. For concrete-filled steel pipe columns, the scope of application is limited. At present, it is only widely used in bridges. When the steel pipe wall is thin, steel bars or section steel still need to be arranged inside, and the construction is more complicated. For thicker steel pipe concrete, it cannot be achieved. Ideal combination of steel pipe and concrete. At the same time, the current combination form of CFST columns is still relatively single, and it is difficult to apply when the cross-sectional shape is special, and the restraint effect is not fully exerted. Therefore, developing a new type of confined concrete composite column has become an urgent problem to be solved in construction.

Utility model content

The technical problem to be solved by the utility model is: to provide a steel-concrete composite column, that is, a constrained concrete composite column, which overcomes the shortcomings of traditional reinforced concrete columns of poor ductility and energy dissipation, and at the same time improves the section form of steel tube concrete, thereby greatly improving its application range.

In order to solve the problems of the technologies described above, the technical solution adopted in the utility model is:

Constrained concrete composite columns include square steel pipe columns, U-shaped steel pipe columns, L-shaped steel pipe columns and concrete columns. A square steel pipe column is used as a reference column, and U-shaped steel pipe columns are welded sequentially along the adjacent sides of the reference column. L-shaped steel pipe columns are sequentially welded along the adjacent sides of the U-shaped steel pipe columns to form a steel pipe bundle, and finally concrete is filled in each square steel pipe column of the steel pipe bundle to form a constrained concrete composite column.

Further, the U-shaped steel pipe column includes a U-shaped opening, adjacent sides of the U-shaped opening, and opposite sides of the U-shaped opening; the L-shaped steel pipe column includes L-shaped steel pipe column sides.

As a preference, the constrained concrete composite column is a rectangular column structure, the reference column is located at a corner of the constrained concrete composite column, and several U-shaped steel pipe columns are welded along the horizontal direction and the vertical direction of the reference column to form side columns, and then the welding Several L-shaped steel pipe columns distributed in an array are welded on the inside of the last two side columns to form the final steel pipe bundle, which is finally filled with concrete.

Further, the U-shaped opening is welded to two adjacent sides of the corner reference column, and the U-shaped opening is welded to the opposite sides of the U-shaped opening in sequence; the sides of the L-shaped steel pipe column are respectively connected to the adjacent sides of the two butted U-shaped openings 1. Adjacent sides of the two butted U-shaped openings are connected to the sides of the L-shaped steel pipe column or two butted sides of the L-shaped steel pipe column.

As a preference, the constrained concrete composite column is a square column structure, the reference column is located in the middle of the constrained concrete composite column, and several U-shaped steel pipe columns are welded along the sides of the reference column to form the spine, and then several U-shaped steel pipe columns are welded around the welded spine. L-shaped steel tube columns form the final steel tube bundle, which is finally filled with concrete.

Further, the U-shaped opening is welded to the four sides of the central reference column, and the U-shaped opening is welded to the opposite sides of the U-shaped opening in sequence; The adjacent sides of the butted U-shaped openings are connected to the sides of the L-shaped steel pipe column or the sides of two butted L-shaped steel pipe columns.

As a preference, the constrained concrete composite column is a special-shaped column structure, the reference column is located at a corner of the constrained concrete composite column, U-shaped steel pipe columns are welded along the horizontal direction and the vertical direction of the reference column to form the final steel pipe bundle, and finally the concrete to fill.

Further, the square steel pipe column, U-shaped steel pipe column and L-shaped steel pipe column are all cold-formed thin-walled steel pipes, and the side length of a single steel pipe column should not be less than 100 mm and should not be greater than 300 mm.

Further, the square steel pipe column has a square or rectangular structure; the wall of the square steel pipe column is provided with openings.

Further, the connections between the steel pipes are all welded by three-side surround welding.

The beneficial effects of the utility model are:

The new type of confined concrete composite column is mainly composed of confined concrete and steel plates to provide bearing capacity, and utilizes the good bearing capacity and plastic deformation capacity of steel tube confined concrete to resist shear. Improve the bond between the two, and increase the contact area between the steel plate and concrete, so as to ensure the joint action of the steel plate and concrete and improve the restraint of the concrete, which can significantly improve the shear bearing capacity and ductility energy dissipation of the column ability, thereby greatly improving the seismic performance of ordinary columns.

The structure of the new confined concrete composite column is simple, the steel pipe bundle is directly prefabricated in the factory, and the concrete is cast in place after the installation is completed, which greatly facilitates the construction and eliminates the disadvantages of difficult structure and complicated construction of the ordinary reinforced concrete column; and because the steel pipe bundle Each steel pipe is equivalent to a concrete delivery pipe, so the concrete is not easy to segregate. Therefore, compared with ordinary concrete-filled steel tube concrete, steel tube beam concrete is made by splicing, and the overall cross-section has various forms, while the concrete cross-section in each cavity is smaller, and the concrete in the core area is better restrained and can better play the role of concrete. At the same time, each cavity is a thin-walled steel pipe. When the cross-section of the column is large, there is no need to consider the welding problem of the thick-walled steel pipe, and the manufacture of the steel pipe bundle is relatively simple.

Under the action of large earthquakes, the confinement effect of concrete on multi-layer built-in steel pipes has greatly weakened the problems that single-layer steel pipes are more prone to buckling and instability under repeated loads, and the use of high-strength concrete is limited. At the same time, because the new confined concrete composite column is composed of multiple steel tube concrete, when the column is subjected to eccentric load and uneven load, the force is clear and the force analysis is simple.

The utility model absorbs the advantages of the steel pipe concrete column, greatly improves the bearing capacity, has higher plasticity and seismic performance, and has remarkable economic effects. The construction is simple, and the construction period can be greatly shortened. performance, and because part of the steel pipe is embedded in the concrete, it can more effectively prevent the out-of-plane instability of the steel plate. At the same time, in terms of force analysis, the force of steel tube bundled concrete is more clear, and the analysis is more concise. It can be applied to cross-section columns of various shapes, and can be popularized and applied in high-rise buildings and buildings in areas with high seismic intensity.

Description of drawings

Figure 1 is a schematic cross-sectional view of a square-section concrete-filled steel tube beam column;

Figure 2 is a schematic cross-sectional view of a rectangular-section concrete-filled steel tube beam column;

Fig. 3 is a cross-sectional schematic diagram of a square-section concrete-filled steel tube beam column with a reference column in the middle;

Fig. 4 is a schematic cross-sectional view of a novel confined concrete composite column with special-shaped cross-section;

Figure 5(a)-(c) are schematic diagrams of square steel pipe columns, U-shaped steel pipe columns and L-shaped section steel pipe columns;

Fig. 6 is (a)-(c) the stress nephogram after carrying out finite element analysis to common square steel pipe;

Fig. 7 is the load-displacement curve after carrying out finite element analysis to common square steel pipe;

Figure 8 is (a)-(c) the stress cloud diagram after the finite element analysis of the new confined concrete composite column;

Fig. 9 is the load-displacement curve after finite element analysis of the restrained concrete composite column of the present invention.

In the figure: 1 is a square steel pipe column, 2 is a U-shaped steel pipe column, 2-1 is a U-shaped opening, 2-2 is the adjacent side of the U-shaped opening, 2-3 is the opposite side of the U-shaped opening, and 3 is an L-shaped steel pipe 3-1 is the edge of the L-shaped steel pipe column; 4 is the inner concrete column.

detailed description

Below in conjunction with specific example and accompanying drawing, the utility model is further described. It should be noted that the following examples are only limited to explain the utility model, but do not limit the implementation scope of the utility model. All structural additions made on the basis of this program or replacements with the same content should belong to the protection scope of the present utility model.

As shown in Figure 1 and Figure 5(a)-(c), an implementation of the confined concrete composite column is a steel tube bundled concrete square column structure, including a square steel tube column 1, a U-shaped steel tube column 2, and an L-shaped steel tube column 3 and filled concrete column 4. Among them, the square steel pipe column 1 is a square structure, adopts a reference column, and welds two U-shaped steel pipe columns 2 along the horizontal direction and the vertical direction of the reference column to form side columns, and then welds four corners at the bottom right of the two side columns after welding. Each L-shaped steel pipe column 3 forms the final steel pipe bundle, which is finally filled with concrete.

Wherein: the square steel pipe column 1 is the reference column of the upper left corner column, U-shaped steel pipe columns 2 are welded successively along the two adjacent sides of the square steel pipe column 1, and the U-shaped opening 2-1 of the U-shaped steel pipe column 2 is sequentially connected with the shape The square side of the steel pipe column 1 is connected to the opposite side 2-3 of the U-shaped opening of the adjacent U-shaped steel pipe column 2; L-shaped steel pipe columns are sequentially welded along the adjacent sides 2-2 of the U-shaped opening of the U-shaped steel pipe column 2 3. The L-shaped steel pipe column side 3-1 of the L-shaped steel pipe column 3 is respectively connected to the two adjacent sides 2-2 of the U-shaped opening, and the adjacent side 2-2 of the U-shaped opening is connected to the L-shaped Steel pipe column sides 3-1 are connected, or two butted L-shaped steel pipe column sides 3-1 are connected to form a steel pipe bundle, and finally filled with concrete in each square steel pipe column 1 of the steel pipe bundle to form a constrained concrete composite column .

As shown in FIG. 2 , the second embodiment of the confined concrete composite column is a steel tube beam concrete rectangular column structure, which also includes a square steel tube column 1 , a U-shaped steel tube column 2 , an L-shaped steel tube column 3 , and an inner-filled concrete column 4 . Among them: the square steel pipe column 1 is the reference column of the upper left corner column, and then the U-shaped steel pipe column 2 is welded along the direction perpendicular to the two adjacent sides of the square steel pipe to form two side columns in the rectangular column, and then the remaining part is formed by L Shaped steel pipe column 3 welds the interior with the other two side columns to form a final steel pipe bundle, which is finally filled with concrete.

As shown in Figure 3, the third embodiment of the constrained concrete composite column is a steel tube bundled concrete square column structure. U-shaped steel pipe columns 2 are sequentially welded to form the spine, and then several L-shaped steel pipe columns (3) are welded around the welded spine to form the final steel bundle. The U-shaped opening 2-1 of the U-shaped steel pipe column 2 is sequentially connected to the square side of the U-shaped steel pipe column 1; the L-shaped steel pipe column 3 is sequentially welded on the adjacent side 2-2 of the U-shaped opening of the U-shaped steel pipe column 2, The L-shaped steel pipe column side 3-1 of the L-shaped steel pipe column 3 is respectively connected with two adjacent sides 2-2 of the U-shaped opening, and the adjacent side 2-2 of the U-shaped opening is connected with the L-shaped steel pipe column side. 3-1 or two butt-connected L-shaped steel pipe column sides 3-1 to form a steel pipe bundle, and finally fill each square steel pipe column 1 of the steel pipe bundle with concrete to form a constrained concrete composite column.

As shown in FIG. 4 , the fourth embodiment of the confined concrete composite column is a special-shaped steel tube beam concrete column structure, including a square steel tube column 1 , a U-shaped steel tube column 2 , and an inner-filled concrete column 4 . Among them: the square steel pipe column 1 is a corner reference column, and then the U-shaped steel pipe column 2 is welded along the direction perpendicular to the two adjacent sides of the square steel pipe, and finally filled with concrete.

The reference column of the utility model is not only a square, but also a rectangle, and the side lengths of the L-shaped and U-shaped columns can also be changed to meet the combination of different sizes. Concrete-filled steel tubes are composed of small-section concrete-filled steel tube columns, which can be composed of columns of various cross-sections and sizes. The above-mentioned square steel pipe column 1, U-shaped steel pipe column 2 and L-shaped steel pipe column 3 are all cold-formed thin-walled steel pipes; the connections between the steel pipes are all welded by three-sided surrounding welding.

The new constrained concrete composite column of the utility model is designed as an integrated structure, the square column is the reference column, the U-shaped column is the side column, and the L-shaped column is the supplementary column, which is finally filled with concrete. In addition to several new confined concrete composite columns in this embodiment, other types of special-shaped columns can also be formed from several single columns.

The utility model is composed of the above-mentioned various steel pipe concrete, and uses the finite element method to simulate the ordinary steel pipe concrete column and the new confined concrete composite column with the same size and steel ratio, as shown in the analysis results of Figure 6 (a)-(c)- 8(a)-(c). Through the comparison of the stress cloud diagrams in Figure 6(a)-(c) and Figure 8(a)-(c), it shows that the deformation of steel pipe bundles is similar to that of ordinary square steel pipes, both of which are deformed in the middle section, while for the filled concrete In other words, the concrete in the steel tube bundles is well protected, and there is no great deformation or damage. At the same time, comparing Figure 7 and Figure 9, the results show that the ductility of the new confined concrete composite column is more than ten times that of ordinary concrete filled steel tube, which has good deformation capacity and ductility coefficient, and has strong seismic performance.

The utility model is formed by combining the above-mentioned multiple concrete-filled steel tube column units, and the stress is clear under complex stress conditions, which is convenient for force analysis, especially simpler in the force analysis of special-shaped columns. Compared with ordinary concrete-filled steel tube columns, thick-walled steel tubes will not appear no matter how large the cross-sectional area of the column is, and steel tubes are also embedded inside the whole, so it shows better seismic performance while absorbing the excellent performance of steel tube concrete. Construction performance and suitability.

In order to ensure sufficient bearing capacity and construction performance, the steel tubes in the steel tube bundle concrete are cold-formed thin-walled steel tubes, and the side length of a single steel tube column should not be less than 90 mm and should not be greater than 300 mm. In order to better ensure that the steel plate and concrete work together, openings can be made in the inner steel pipe column of the new confined concrete composite column.

The construction technique of the novel constrained concrete composite column described in the utility model:

The cold-formed thin-walled steel pipes of the new confined concrete composite columns and the welding between the steel pipes can be manufactured by a professional steel structure company, and then transported to the construction site without formwork and further concrete pouring.

When adopting the new constrained concrete composite column structure, holes can be made on the pipe wall of the composite inner column to ensure the effective connection between steel and concrete. Through the novel constrained concrete composite column designed by the utility model, the energy dissipation capacity of the column is improved, the anti-seismic performance is improved, and the construction is convenient and quick, creating certain social and economic benefits.

Claims (10)

1. confined concrete coupled column, it is characterised in that：Including square bar tubing string (1), U-shaped steel pipe column (2), L-shaped steel pipe column (3) And concrete column (4), it is a benchmark post by a quadrate steel pipe column (1), is welded with U-shaped along the adjacent edge of benchmark post successively Steel pipe column (2), is welded with L-shaped steel pipe column (3) along the adjacent edge of U-shaped steel pipe column (2) successively, constitutes steel pipe bundle, finally by mixing Solidifying soil is filled in each square steel pipe column (1) of steel pipe bundle, forms confined concrete coupled column.

2. confined concrete coupled column according to claim 1, it is characterised in that：The U-shaped steel pipe column (2) is including U-shaped Opening (2-1), U-shaped opening adjacent edge (2-2) and U-shaped opening relative edge (2-3)；The L-shaped steel pipe column (3) is including L-shaped steel pipe Post side (3-1).

3. confined concrete coupled column according to claim 2, it is characterised in that：The confined concrete coupled column is square Shape rod structure, benchmark post are located at a corner of confined concrete coupled column, respectively weld along benchmark post horizontal direction and vertical direction Connect several U-shaped steel pipe columns (2) and constitute side column, it is in array distribution that several are then welded on the inside of two side columns after welding L-shaped steel pipe column (3) forms final steel pipe bundle, is finally filled by concrete.

4. confined concrete coupled column according to claim 3, it is characterised in that：The U-shaped opening (2-1) and corner base Quasi- post adjacent two edges welding, U-shaped opening (2-1) are welded successively with U-shaped opening relative edge (2-3)；The L-shaped steel pipe column side (3-1) U-shaped opening adjacent edge (2-2) respectively with two docking, the relative U-shaped opening adjacent edge (2-2) for connecing and L-shaped steel pipe columns In the L-shaped steel pipe column of (3-1) or two docking, (3-1) connects.

5. confined concrete coupled column according to claim 2, it is characterised in that：The confined concrete coupled column is for just Square rod structure, benchmark post are located at the middle part of confined concrete coupled column, respectively weld several U-shaped steel along each edge direction of benchmark post Tubing string (2) constitutes spinal column, and then spinal column periphery after welding welds several L-shaped steel pipe columns (3) and forms final steel pipe bundle, Finally it is filled by concrete.

6. confined concrete coupled column according to claim 5, it is characterised in that：The U-shaped opening (2-1) and middle part base Quasi- post four edges welding, U-shaped opening (2-1) are welded successively with U-shaped opening relative edge (2-3)；The L-shaped steel pipe column side (3-1) Respectively with two the U-shaped opening adjacent edges (2-2) for docking, the relative U-shaped opening adjacent edge (2-2) for connecing and L-shaped steel pipe column side (3- 1) the L-shaped steel pipe column side (3-1) of or two docking connects.

7. confined concrete coupled column according to claim 2, it is characterised in that：The confined concrete coupled column is different Shape rod structure, benchmark post are located at a corner of confined concrete coupled column, respectively weld along benchmark post horizontal direction and vertical direction Connect U-shaped steel pipe column (2) and form final steel pipe bundle, be finally filled by concrete.

8. confined concrete coupled column according to claim 1, it is characterised in that：The square bar tubing string (1), U-shaped steel Tubing string (2) and L-shaped steel pipe column (3) are cold-formed thin-walled steel pipe, and the length of side of single steel pipe column is no less than 100mm, should not be big In 300mm.

9. confined concrete coupled column according to claim 8, it is characterised in that：The square bar tubing string (1) is pros Shape or rectangle structure；Square bar tubing string (1) tube wall is provided with perforate.

10. confined concrete coupled column according to claim 8, it is characterised in that：Connection between the steel pipe is adopted Welded with the weldering of three skirts.