CN209620405U - Steel plate-ultra-high-strength concrete composite column structure - Google Patents

Abstract

The utility model discloses a steel plate-ultrahigh-strength concrete composite column structure, which comprises a steel pipe made of Q345 steel and a steel support. The steel support is placed at the lower end of the inner cavity of the steel pipe after being completely covered with sealing materials. The steel pipe is poured with ultra-high strength concrete, so that under load, the deformation in the steel pipe is mainly concentrated on the steel support. The deformation of the steel plate-ultra-high-strength concrete composite column structure of the utility model is mainly borne by the steel support. When the composite column is subjected to a relatively large load, the steel support undergoes plastic deformation to consume energy, so as to avoid filling with ultra-high-strength concrete Being crushed ensures that the composite column still has a high bearing capacity under relatively large deformation, and the good ductility also improves the seismic performance of the composite column.

Description

Steel plate-ultra-high-strength concrete composite column structure

technical field

The utility model belongs to the technical field of building structures, in particular to a steel plate-ultrahigh-strength concrete composite column structure.

Background technique

Concrete filled steel pipe column is a new type of high-efficiency composite member, which consists of steel pipes and concrete inside the steel pipes. Due to the lateral restraint of the steel pipe by the inner filling concrete, the overall or local stability of the steel pipe is greatly improved, and the premature local buckling of the steel pipe is avoided. In addition, the steel pipe will conversely restrain the external expansion of the inner-filled concrete, which greatly improves the bearing and deformation capacity of the inner-filled concrete. Through the exertion of combination, CFST can give full play to the material properties of both steel and concrete. In addition, the steel pipe can also be used as a formwork for concrete pouring, which saves the support and form removal process, thereby greatly shortening the construction period. Based on the above advantages, CFST columns are widely used in long-span bridges and super high-rise buildings. The steel tube concrete column will deform when it bears the load, which is jointly borne by the steel tube and the inner filling concrete. Concrete is a brittle material. When its deformation exceeds its ultimate compressive strain, the concrete will be crushed and its bearing capacity will decrease. After using ultra-high-strength concrete, the restraining effect of steel pipes on concrete is reduced compared with that of ordinary concrete, resulting in poor post-deformation capacity of composite columns. Based on this, it is difficult to popularize and apply steel pipe-ultra-high-strength concrete composite columns in super high-rise building structures.

Utility model content

The purpose of the utility model is to overcome the defects of the prior art and provide a steel plate-ultra-high-strength concrete composite column structure.

The technical scheme of the utility model is as follows:

Steel plate-ultra-high strength concrete composite column structure, including

A steel pipe made of Q345 steel;

and a steel support, both including an upper end plate, a lower end plate and several connecting steel columns made of Q235 steel, the upper end plate and the lower end plate are fixedly connected by several connecting steel columns, and the shape and size of the upper end plate and the lower end plate are the same;

The steel support is placed at the lower end of the inner cavity of the steel pipe after being completely covered with sealing materials. The steel pipe is poured with ultra-high strength concrete, so that under load, the deformation in the steel pipe is mainly concentrated on the steel support.

In a preferred embodiment of the present invention, the thickness of the upper end plate and the lower end plate of the steel support is 30-35mm.

In a preferred embodiment of the present utility model, the total area of the cross-sections of several connecting steel columns of each steel support is 30-35% of the area of the upper end plate.

In a preferred embodiment of the present utility model, the side length or diameter of the upper end plate and the lower end plate is 4-6 mm smaller than the side length or inner diameter of the inner cavity of the steel pipe.

In a preferred embodiment of the present invention, the height of the steel support is 1.0-1.5 times the side length or outer diameter of the steel pipe.

The beneficial effects of the utility model are:

1. The deformation of the steel plate-ultra-high-strength concrete composite column structure of the present utility model is mainly borne by the steel support. The high-strength concrete is crushed, which ensures that the composite column still has a high bearing capacity under relatively large deformation, and the good ductility also improves the seismic performance of the composite column.

2. The steel plate-ultra-high-strength concrete composite column structure of the present invention adopts ultra-high-strength concrete, which can effectively reduce the cross-sectional size of the composite column.

Description of drawings

Fig. 1 is a longitudinal structural sectional view of the steel plate-ultra-high strength concrete composite column structure in Example 1 of the present utility model.

Fig. 2 is a top view of the steel plate-ultra-high-strength concrete composite column structure in Example 1 of the present utility model.

Fig. 3 is a schematic diagram of the three-dimensional structure of the steel support in Embodiment 1 of the present utility model.

Fig. 4 is a schematic cross-sectional view of the steel support in Embodiment 1 of the present utility model.

Fig. 5 is a longitudinal structural sectional view of the steel plate-ultra-high-strength concrete composite column structure in Example 2 of the present utility model.

Fig. 6 is a top view of the steel plate-ultra-high-strength concrete composite column structure in Example 2 of the present utility model.

Fig. 7 is a schematic diagram of the three-dimensional structure of the steel support in Example 2 of the present invention.

Fig. 8 is a schematic cross-sectional view of the steel support in Example 2 of the present utility model.

Detailed ways

The technical solutions of the present utility model are further illustrated and described below through specific embodiments.

Example 1

As shown in FIGS. 1 and 2 , a steel plate-ultrahigh-strength concrete composite column structure includes a steel pipe 1 and a steel support 2 .

Steel pipe 1, the cross section is square, and the material is Q345 steel;

As shown in Figures 3 and 4, the steel support 2 is made of Q235 steel, and includes a square upper end plate 21, a square lower end plate 22 and several connecting steel columns 23 with a square cross section, the upper end plate 21 and The lower end plate 22 is solidly connected (welded) by several connecting steel columns 23, the size of the upper end plate 21 and the lower end plate 22 are the same, and the side length of the upper end plate 21 and the lower end plate 22 is 4-4- 6mm, the height of steel support 2 is 1.0-1.5 times of the side length of steel pipe 1; Connect the upper end plate 21 and the lower end plate 22, each column is arranged along the side length direction of the upper end plate 21, there is a gap between two adjacent connected steel pipes 1, and the size of the adjacent gap 24 is the same;

The steel support 2 is placed at the lower end of the inner cavity of the steel pipe 1 after being completely covered with FRP cloth, and the ultra-high-strength concrete 3 of grade C150 or above is poured in the steel pipe 1, so that under a large load, the steel pipe 1 The deformation is mainly concentrated in the steel support 2, that is, the connecting steel column 23 in the steel support 2 undergoes plastic deformation to dissipate energy, while the ultra-high-strength concrete does not break, ensuring that the composite column can still have a large deformation. Good carrying capacity.

The thickness of the upper end plate 21 and the lower end plate 22 is 30-35mm, and the total area of the cross-sections of several connecting steel columns 23 of each steel support 2 is 30-35% of the area of the upper end plate 21, so as to ensure the super height Before the strength concrete 3 reaches the ultimate compressive strain, the connecting steel columns 23 of the steel support 2 have all entered the yield stage.

The construction method of this embodiment is:

Process the steel pipe 1 and the steel support 2 in the factory; wrap and seal the steel support 2 with FRP cloth; place the sealed steel support 2 at the lower end of the inner cavity of the steel pipe 1; pour ultra-high-strength concrete 3 into the steel pipe 1 After the concrete is hardened, the construction of this embodiment is completed.

Example 2

As shown in FIG. 5 and FIG. 6 , a steel plate-ultra-high-strength concrete 3 composite column structure includes a steel pipe 1 and a steel support 2 .

Steel pipe 1, the cross section is circular, and the material is Q345 steel;

As shown in Figures 7 and 8, the steel support 2 is made of Q235 steel, and includes a circular upper end plate 21, a circular lower end plate 22 and several connecting steel columns 23 with circular cross-sections. The plate 21 and the lower end plate 22 are solidly connected (welded) by several connecting steel columns 23, the size of the upper end plate 21 and the lower end plate 22 are the same, and the diameters of the upper end plate 21 and the lower end plate 22 are 4-6mm smaller than the inner diameter of the steel pipe 1, The height of the steel support 2 is 1.0-1.5 times the diameter of the steel pipe 1; as shown in Figure 7 and Figure 8, preferably, the number of connecting steel columns 23 is nine, connecting the upper end plate 21 and the lower end plate 22, one of which is connected The steel column 23 is located at the center of the upper end plate 21, and the remaining eight connecting steel columns 23 are arranged at equal intervals along the periphery of the upper end plate 21;

The steel support 2 is placed at the lower end of the inner cavity of the steel pipe 1 after being completely covered with FRP cloth, and the ultra-high-strength concrete 3 of grade C150 or above is poured in the steel pipe 1, so that under a large load, the steel pipe 1 The deformation of the steel support 2 is mainly concentrated in the steel support 2, that is, the connecting steel column 23 in the steel support 2 undergoes plastic deformation to dissipate energy, while the ultra-high-strength concrete 3 does not break, ensuring that the composite column can still withstand large deformations. Have good carrying capacity.

The thickness of the upper end plate 21 and the lower end plate 22 is 30-35mm, and the total area of the cross-sections of several connecting steel columns 23 of each steel support 2 is 30-35% of the area of the upper end plate 21, so as to ensure the super height Before the strength concrete 3 reaches the ultimate compressive strain, the connecting steel columns 23 of the steel support 2 have all entered the yield stage.

The construction method of this embodiment is:

Process the steel pipe 1 and the steel support 2 in the factory; wrap and seal the steel support 2 with FRP cloth; place the sealed steel support 2 at the lower end of the inner cavity of the steel pipe 1; pour ultra-high-strength concrete 3 into the steel pipe 1 , the construction of this embodiment will be completed after the ultra-high-strength concrete 3 hardens.

The above is only a preferred embodiment of the utility model, so the scope of implementation of the utility model cannot be limited accordingly, that is, the equivalent changes and modifications made according to the patent scope of the utility model and the contents of the specification should still belong to Within the scope covered by the utility model.

Claims (5)

1. steel plate-ultra high strength concrete composite column structure, it is characterised in that: including

The steel pipe of one Q345 steel material；

With a bridle iron, a upper head plate, a bottom plate and several connection steel columns, upper head plate and lower end including Q235 steel material For plate by several connection steel column Joints, upper head plate is identical with the geomery of bottom plate；

Bridle iron is placed on the lower end of the inner cavity of steel pipe through cladding sealing material completely, has poured superhigh intensity coagulation in steel pipe Soil, so that the deformation in steel pipe focuses primarily upon bridle iron under load effect.

2. a kind of steel plate-ultra high strength concrete composite column structure as described in claim 1, it is characterised in that: the steel branch Seat upper head plate and bottom plate with a thickness of 30-35mm.

3. a kind of steel plate-ultra high strength concrete composite column structure as described in claim 1, it is characterised in that: each steel branch The gross area of the cross section of several connection steel columns of seat is the 30-35% of the area of upper head plate.

4. a kind of steel plate-ultra high strength concrete composite column structure as described in claim 1, it is characterised in that: the upper end The side length or diameter of plate and bottom plate are than the side length of the inner cavity of the steel pipe or the small 4-6mm of internal diameter.

5. a kind of steel plate-ultra high strength concrete composite column structure as described in claim 1, it is characterised in that: the steel branch The height of seat be the steel pipe side length or 1.0-1.5 times of outer diameter.