CN106639155B - An inverted trapezoidal variable cross-section steel tube concrete column - Google Patents

Abstract

The invention discloses an inverted trapezoid variable cross-section concrete filled steel tubular column, which comprises a steel tube and concrete, wherein the steel tube is composed of a plurality of inverted right trapezoid hollow shells positioned on different floors, each hollow shell is sequentially arranged along an oblique direction and is a flat body, one side surface of each hollow shell is a vertical surface, the other side surface of each hollow shell is an inclined surface, one end of the top surface of each hollow shell positioned on the inclined surface is an outer end surface, the bottom end of each hollow shell is provided with a hole, the hole at the bottom end of the hollow shell positioned on the previous floor is fixed on the outer end surface of the top surface of the hollow shell positioned on the next floor so as to enable the interiors of the adjacent hollow shells to be communicated, the outer side surfaces of the hollow shells form an inclined surface integrally, and the inclination angle of the inclined surface is the inclination angle of the outer vertical surface of a building. The invention is suitable for building bodies with inclined outer vertical surfaces, can better meet the appearance effect of buildings, keeps the cantilever spans of all layers consistent, and simultaneously keeps the vertical effect of the inner space; the invention bears the vertical load according to the inclined column stress mode, and the structure stress is reasonable.

Description

An inverted trapezoidal variable cross-section steel tube concrete column

technical field

The invention relates to a steel pipe concrete column, in particular to an inverted trapezoidal variable cross-section steel pipe concrete column, which is suitable for building shapes with inclined building facades.

Background technique

Concrete-filled steel tube columns are a new type of composite structure formed by filling concrete into steel tubes. Concrete is poured into the steel pipes and compacted to increase the strength and rigidity of the steel pipes. Generally speaking, concrete filled steel tubes with a concrete strength level below C50 are called ordinary steel tube concrete; concrete steel tubes with a concrete strength level above C50 are called high-strength steel tube concrete; steel tube concrete with a concrete strength level above C100 are called super high-strength steel tube concrete. Concrete filled steel tubes can effectively utilize the respective advantages of steel and concrete, and at the same time overcome the shortcomings of steel tubes that are prone to local buckling.

In recent years, with the deepening of theoretical research on CFST and the emergence of new construction techniques, the engineering application of CFST has become increasingly widespread. According to the different cross-sectional forms, CFST columns can be divided into rectangular CFST columns, circular CFST columns and polygonal CFST columns, etc. Among them, rectangular CFST columns and circular CFST columns are widely used.

However, since these different forms of CFST columns are all equal-section columns, the following two setting methods are usually adopted for the constant-section columns for building shapes with inclined building facades:

1. The concrete-filled steel tube columns are arranged obliquely along the facade of the building. In this way, the concrete-filled steel tube column presents a tilting effect on the first floor indoors, and the architectural perception is not good, which often cannot meet the requirements of the indoor effect of the building.

2. The concrete-filled steel tube columns are arranged vertically. This method can meet the indoor effect of the building. However, due to the slope of the building's facade, as the number of building floors increases, the cantilever span of each floor structure gradually becomes larger, resulting in unreasonable stress on the cantilever end of the structure.

Contents of the invention

The object of the present invention is to provide a building shape with simple structure, low construction cost and short construction period, which is suitable for inclined building facades, satisfies the architectural appearance effect, keeps the cantilever spans of each floor consistent, and ensures that the internal space is vertical. Inverted trapezoidal variable cross-section concrete filled steel tube column with reasonable effect and structural force, which can ensure the effective connection between the floor beam and the column.

The purpose of the present invention is achieved through the following technical solutions: an inverted trapezoidal variable cross-section steel pipe concrete column, comprising steel pipes and concrete, characterized in that: the steel pipes are composed of several inverted right-angled trapezoidal hollow shells located on different floors , each hollow shell is arranged in sequence along the oblique direction, the hollow shell is a flat body, one side of the hollow shell is a vertical surface, as the inner side of the hollow shell, the other side of the hollow shell One side is an inclined surface, as the outer surface of the hollow casing, the top surface of the hollow casing is located at the end of the inclined surface as the outer end surface, and the bottom end of the hollow casing is open, located on the upper The bottom opening of the hollow shell on the floor is fixed on the outer end surface of the top surface of the hollow shell on the next floor so that the adjacent hollow shells communicate with each other, and the outer surface of each hollow shell is integrally formed An inclined plane, the inclination angle of the inclined plane is the inclination angle of the facade of the building.

The inner surface of the present invention is a vertical surface, the outer surface is an inclined surface, and the outer surface forms an inclined surface as a whole, and the inclination angle of the inclined surface is the inclination angle of the building facade. The architectural shape can better meet the architectural appearance effect, and the cantilevered spans of each floor are kept consistent, while the internal space can maintain the vertical effect; in addition, the present invention bears the vertical load according to the force mode of the inclined column, and the structure is stressed Reasonable. The present invention is an inverted trapezoidal structure, the section height of the top of the column at each floor has high rigidity and bearing capacity, and the oblong section of the top of the column can not only reduce the span of the cantilever, but also can have a large span along the vertical direction (the direction of the strong axis) The floor beams and cantilever beams provide sufficient support stiffness, and at the same time provide sufficient support width for the floor beams along the horizontal direction (weak axis direction), so as to ensure the effective connection between the floor beams and columns.

As an embodiment of the present invention, the cross section of the hollow shell is oblate and rectangular, and the inner and outer sides of the hollow shell are planes.

As another embodiment of the present invention, the cross-section of the hollow shell is oblate, and the inner and outer sides of the hollow shell are arc-shaped.

As an embodiment of the present invention, the bottom opening of the hollow shell is a circular hole or a flat oval hole.

As a preferred embodiment of the present invention, the hollow shell is mainly composed of a pair of opposite and parallel inverted trapezoidal webs, a sealing steel plate as the top surface of the hollow shell, a vertical arc-shaped steel plate and Composed of obliquely arranged steel pipe columns, the outer convex surface of the arc-shaped steel plate is the inner surface of the hollow shell, and the two sides of the arc-shaped steel plate are respectively connected to one side of the pair of webs. The other sides of the pair of webs are respectively connected to the outer wall of the steel pipe column, so that a part of the steel pipe column in the axial direction is outside the pair of webs as the outer surface of the hollow shell, and the other part is outside the hollow shell. Between the webs, an opening at the upper end and a hole at the bottom end are formed. The sealing steel plate is oblate and elliptical. The sealing steel plate is arranged on the opening at the upper end. The gap and the edge of the part of the steel pipe column outside the pair of webs form a through hole, and the bottom opening of the hollow shell on the upper floor is connected with the through hole of the hollow shell on the next floor.

As an embodiment of the present invention, the steel pipe column is a complete steel pipe, and each hollow shell shares one steel pipe column.

As another embodiment of the present invention, the steel pipe column is mainly composed of an arc-shaped steel plate and a stiffening plate. Correspondingly connected to one side of the pair of webs, the two sides of the stiffening plate are respectively connected to the inner walls of the pair of webs, and the stiffening plate is perpendicular to the pair of webs, the curved steel plate, stiffening plate And the web forms an enclosed steel pipe column, and each hollow shell shares a steel pipe column.

As an embodiment of the present invention, the concrete is poured in the hollow shell.

As another embodiment of the present invention, the concrete is poured in steel pipe columns.

As an improvement of the present invention, a pedestal rib plate with a hole in the middle is provided in the bottom of the hollow shell, and the pedestal rib plate is arranged horizontally and its edge is connected to the inner wall circumference of the hollow shell Above, the column base plate is cut by the stiffening plate; the arc-shaped steel plate vertically arranged on the hollow shell on the upper floor extends downward through the gap of the sealing steel plate of the hollow shell on the next floor. In the top of the hollow shell, a central rib plate with a hole in the middle is provided in the top of the hollow shell, and the rib plate in the column is arranged horizontally and its plate edge is connected to the inner wall of the hollow shell On the circumference, the bottom end of the arc-shaped steel plate vertically arranged on the hollow shell on the upper floor is fixed on the rib in the column, and the rib in the column is cut by the stiffening plate; The space enclosed by the arc-shaped steel plate of the steel pipe column at the top of the hollow shell and the vertically arranged arc-shaped steel plate of the hollow shell on the upper floor is the column top space, in which there is a central opening. The column top rib is arranged horizontally and its plate edge is connected to the inner wall circumference of the column top space, and the column top rib is cut by the stiffening plate.

As a further improvement of the present invention, several pairs of vertical stiffeners are arranged between the sealing steel plate and the rib in the column and outside the space of the column top, and each pair of stiffeners is correspondingly arranged on both sides of the rib in the column.

As an embodiment of the present invention, the central openings of the column foot ribs, column middle ribs and column top ribs are flat oval holes.

Compared with prior art, the present invention has following remarkable effect:

(1) The inner surface of the present invention is a vertical surface, the outer surface is an inclined surface, and the outer surface forms an inclined surface as a whole, and the inclination angle of the inclined surface is the inclination angle of the building facade. The building shape can better meet the architectural appearance effect, and the cantilever span of each floor is consistent, and the internal space of the building shape can maintain the vertical effect.

(2) In the present invention, the column foot of each floor is eccentrically arranged relative to the column top of the lower floor, and a full-length circular steel pipe concrete slanted column is arranged along the inclined surface to ensure that it bears the vertical load according to the force mode of the slanted column, and the structural force is reasonable.

(3) The present invention is an inverted trapezoidal structure, and the section height of the column top at each floor has high rigidity and bearing capacity. The oblong section of the column top can not only reduce the cantilever span, but also can be large Span floor beams and cantilever beams provide sufficient support stiffness, and at the same time provide sufficient support width for floor beams along the horizontal direction (weak axis direction), thereby ensuring effective connection between floor beams and columns.

(4) The present invention has the advantages of simple structure, low construction cost and short construction period, and is suitable for promotion and use of building shapes with inclined building facades.

Description of drawings

The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

Fig. 1 is the three-dimensional structure schematic diagram of embodiment 1 of the present invention;

Fig. 2 is one of force schematic diagrams of the present invention;

Fig. 3 is the second of force schematic diagram of the present invention;

Fig. 4 is the elevation view of embodiment 1 of the present invention;

Fig. 5 is the vertical perspective view of Embodiment 1 of the present invention;

6 is a schematic bottom view of Embodiment 1 of the present invention;

Fig. 7 is a schematic top view of Embodiment 1 of the present invention;

Fig. 8 is a sectional view of the present invention along line A-A in Fig. 5;

Fig. 9 is a sectional view of the present invention along line B-B in Fig. 5;

Fig. 10 is a schematic diagram at the bottom of the column of Example 2 of the present invention;

Fig. 11 is a schematic diagram of the column top of Embodiment 2 of the present invention.

detailed description

Example 1

The present invention is applicable to the Guangzhou Art Museum project. The facade of the Guangzhou Art Museum is in an inclined shape, and the cantilevered spans of each floor must be consistent, and at the same time, the vertical effect of the frame columns must be ensured.

As shown in Figures 1 to 9, it is an inverted trapezoidal variable cross-section steel pipe concrete column 1 of the present invention, including steel pipes and concrete 11, the steel pipes are composed of several inverted trapezoidal hollow shells 12 located on different floors, and the concrete is poured in Each hollow shell 12. The figure of this embodiment shows the concrete-filled steel pipe columns on two adjacent floors, and the concrete-filled steel pipe columns of three or more floors can be deduced by analogy. Each hollow shell 12 is arranged in sequence along the oblique direction, and the hollow shell 12 is a flat body. In this embodiment, the cross section of the hollow shell 12 is oblate, and one side of the hollow shell 12 is Vertical surface, the vertical surface is an arc surface, as the inner side 13 of the hollow shell 12, the other side of the hollow shell 12 is an inclined surface, and the inclined surface is an arc surface, as the outer surface of the hollow shell 12. Side 14, the top surface of the hollow shell 12 is located at one end of the inclined arc surface as the outer end face, the bottom end opening 15 of the hollow shell 12, and the bottom opening 15 of the hollow shell 12 is a circular hole or flat oval holes. The bottom opening 15 of the hollow casing 12 positioned on the previous floor is fixed on the outer end surface of the hollow casing 12 top surface of the next floor so that the adjacent hollow casings 12 are internally communicated, each hollow An inclined surface 16 is formed on the outer surface of the housing 12 as a whole, and the inclination angle of the inclined surface 16 is the inclination angle of the facade of the building. Therefore, it is possible to ensure that the frame columns are inclined along the building facade, while maintaining the vertical effect of the columns between the floors.

The hollow shell 12 is mainly composed of a pair of opposite and parallel inverted trapezoidal webs 17, a sealing steel plate 18 as the top surface of the hollow shell 12, a vertically arranged semicircular arc-shaped steel plate 19 and an obliquely arranged circular Composed of steel pipe columns 20, the outer convex surface of the arc-shaped steel plate 19 is the inner surface 13 of the hollow shell 12, and the two sides of the arc-shaped steel plate 19 are respectively connected to one side of the pair of webs 17, and the pair of webs The other side of the plate 17 is respectively connected with the outer wall of the steel pipe column 20, so that a part of the steel pipe column 20 in the axial direction is outside the pair of webs 17 as the outer surface 14 of the hollow shell 12, while the other part is outside the pair of webs 17. Between the webs 17, thereby forming the upper end opening and the bottom end opening 15, the sealing steel plate 18 is oblate oval, the sealing steel plate 18 is arranged on the upper opening, has a gap on the outer end surface of the sealing steel plate 18, and the gap is connected with the steel pipe column 20 The edges of the parts outside the pair of webs 17 are combined into a through hole, and the bottom opening 15 of the hollow shell 12 on the upper floor is connected with the through hole of the hollow shell 12 on the next floor.

The inclination angle α of the steel pipe column 20 is determined by the facade effect of the building, and the diameter of the steel pipe column 20 is determined by the building floor height and the axial force and bending moment borne by it. The specific size of the web 17 is determined by the length of the lower base, the floor height and the inclination angle α; the side inclination angle of the web 17 is the same as the inclination angle of the steel pipe column 20 (both are α), and the other side of the web 17 remains vertical. Straight state. The length of the lower bottom edge of the web 20 is determined by the axial force and bending moment borne, and the length of the lower bottom edge is greater than or equal to the diameter of the steel pipe column 20, and the length of the upper top edge of the web 20 is a definite value, determined by the length of the web 20 The length, height and inclination angle α of the lower base are determined, and the thickness of the web 20 is determined by the steel pipe column 20 . The semi-circular steel plate 19 keeps the vertical state, and its diameter is determined by the steel pipe column 20 . The diameter of the semicircular arc steel plate 19 is determined by the steel pipe column 20; the steel pipe column 20, the web 17, the semicircular arc steel plate 19 and the sealing steel plate 18 are all connected by welding.

In this embodiment, the steel pipe column 20 is mainly composed of a semi-circular arc-shaped steel plate 21 and a stiffening plate 22. One side of the pair of webs 17 is correspondingly connected, and the two sides of the stiffening plate 22 are respectively connected to the inner walls of the pair of webs 17, and the stiffening plate 22 is perpendicular to the pair of webs 17, the curved steel plate 21, the stiffening plate 22 And the web 17 forms an enclosed steel pipe column 20 , and each hollow shell 12 shares one steel pipe column 20 . In this embodiment, the concrete is poured in the hollow shell. In order to improve the rigidity and bearing capacity of the structure, according to the stress requirements of the structure, in other embodiments, concrete may only be poured in the steel pipe column 20 .

As shown in Figures 5 to 9, a column foot rib 23 with a hole in the middle is provided in the bottom of the hollow shell 12, and the column foot rib 23 is arranged horizontally and its edge is connected to the inner wall circumference of the hollow shell 12. Above, the column foot rib 23 is cut by the stiffening plate 22; the arc-shaped steel plate 19a vertically arranged on the hollow shell 12 on the upper floor passes downwards through the gap of the sealing steel plate 18 of the hollow shell 12 on the next floor Stretch into the top of the hollow shell 12, the top of the hollow shell 12 is provided with a central rib 24 with a hole in the middle, the rib in the column 24 is horizontally arranged and its edge is connected to the hollow shell On the inner wall circumference of 12, the bottom end of the arc-shaped steel plate 19a vertically arranged in the hollow shell 12 on the upper floor is fixed on the rib plate 24 in the column, and the rib plate 24 in the column is cut by the stiffening plate 22; The space enclosed by the arc-shaped steel plate 21 of the steel pipe column 20 at the top of the hollow shell 12 on the first floor and the vertically arranged arc-shaped steel plate 19a of the hollow shell 12 on the upper floor is the column top space. There is a column top rib 25 with a hole in the middle. The column top rib 25 is horizontally arranged and its edge is connected to the inner wall circumference of the column top space. The column top rib 25 is cut by the stiffening plate 22 . Several pairs of vertical stiffeners 26 are arranged between the sealing steel plate 18 and the rib 24 in the column and outside the space of the column top. The central openings of the column foot ribs 23, the column middle ribs 24 and the column top ribs 25 are flat oval holes.

Stress principle of the present invention:

(1) Since the outer side of the steel pipe concrete column of the present invention is a slanted column effect, and the inner side is a vertical column effect, the column foot of each floor concrete steel pipe column is eccentrically arranged relative to the column top of the steel pipe concrete column on the next floor. The vertical axial force P will produce a non-negligible additional moment M at the floor, which will cause unfavorable additional bending moments at each floor for the vertical load. The vertical load is borne by the force mode of the slanted column.

(2) The present invention is an inverted trapezoidal structure, and the cross-sectional height of the column top at each floor has high rigidity and bearing capacity to bear the support bending moment of the floor cantilever beam structure and the large-span structure.

Example 2

As shown in Figures 10 and 11, the difference between this embodiment and Embodiment 1 is that the cross section of the hollow housing 12 is a flat rectangle, and the hollow housing 12 includes an inner side, an outer side and an inverted trapezoidal abdomen. Plate 17, both inner and outer surfaces are flat, that is, the outer surface is a flat steel plate 21a, the inner side is a flat steel plate 19c, the steel pipe column is a complete steel pipe, and each hollow shell shares a steel pipe column.

Example 3

The difference between this embodiment and Embodiment 1 is that the steel pipe column is a complete steel pipe column, and each hollow shell shares a steel pipe column. In order to improve the rigidity and bearing capacity of the structure, concrete can be poured in the entire In the hollow shell, it can also only be poured in the steel pipe column.

The embodiments of the present invention are not limited thereto. According to the above content of the present invention, according to the common technical knowledge and conventional means in this field, without departing from the above-mentioned basic technical idea of the present invention, the shape of the hollow shell of the present invention also has Other embodiments; the hollow shell can also be formed by combining components of other shapes; the reinforcing structure for strengthening the connection nodes of each hollow shell set in the hollow shell can also adopt other structures and structures according to actual conditions. How to set it up. Therefore, the present invention can also be modified, replaced or altered in various forms, all of which fall within the protection scope of the present invention.

Claims (8)

1. An inverted trapezoidal variable cross-section concrete-filled steel tube column, comprising steel pipes and concrete, is characterized in that: the steel pipes are composed of several inverted trapezoidal hollow shells located on different floors, and each hollow shell is sequentially along the oblique direction Set, the hollow shell is a flat body, one side of the hollow shell is a vertical surface, as the inner side of the hollow shell, and the other side of the hollow shell is an inclined surface, as the hollow shell The outer surface of the body, the top surface of the hollow shell located at the end of the inclined surface is the outer end surface, the bottom end of the hollow shell is opened, and the bottom end of the hollow shell located on the upper floor is opened. The hole is fixed on the outer end surface of the top surface of the hollow shell located on the next floor so that the interior of the adjacent hollow shells communicates. The outer surface of each hollow shell forms an inclined plane as a whole, and the inclination angle of the inclined plane is The inclination angle of the facade of the building; the cross-section of the hollow shell is a flat rectangle, and the inner and outer sides of the hollow shell are planes, or the cross-section of the hollow shell is flat Oval, the inner and outer surfaces of the hollow shell are both arc-shaped. 2. The inverted trapezoidal variable cross-section concrete filled steel pipe column according to claim 1, characterized in that: the hole at the bottom of the hollow shell is a circular hole or a flat oval hole. 3. The inverted trapezoidal variable cross-section concrete filled steel pipe column according to claim 2, characterized in that: the hollow shell is mainly composed of a pair of opposite and parallel inverted trapezoidal webs, as the top surface of the hollow shell It consists of a sealing steel plate, a vertically arranged arc-shaped steel plate and an obliquely arranged steel pipe column. The outer convex surface of the arc-shaped steel plate is the inner surface of the hollow shell, and the two sides of the arc-shaped steel plate are respectively One side of the pair of webs is connected correspondingly, and the other side of the pair of webs is respectively connected with the outer wall of the steel pipe column, so that a part of the steel pipe column in the axial direction is outside the pair of webs as the hollow The outer surface of the shell, while the other part is between the pair of webs, thereby forming an upper opening and a bottom opening. The sealing steel plate is oblate and oval, and the sealing steel plate is arranged on the upper opening. There is a notch on the outer end surface of the steel plate, and the notch and the edge of the steel pipe column outside the pair of webs form a through hole. The through hole of the hollow shell is butted. 4. The inverted trapezoidal variable cross-section concrete-filled steel pipe column according to claim 3, characterized in that: the steel pipe column is a complete steel pipe, and each hollow shell shares one steel pipe column. 5. The inverted trapezoidal concrete-filled steel tube column with variable cross-section according to claim 4, characterized in that: the steel tube column is composed of an arc-shaped steel plate and a stiffening plate, and the arc-shaped steel plate and the stiffening plate are arranged obliquely and have the same inclination angle , the two sides of the curved steel plate are respectively connected to one side of the pair of webs, the two sides of the stiffening plate are respectively connected to the inner walls of the pair of webs, and the stiffening plate is perpendicular to the pair of webs plate, the arc-shaped steel plate, the stiffening plate and the web form an enclosed steel pipe column, and each hollow shell shares one steel pipe column. 6. The inverted trapezoidal variable cross-section concrete filled steel pipe column according to claim 4 or 5, characterized in that: the concrete is poured in the hollow shell. 7. The inverted trapezoidal variable cross-section concrete-filled steel pipe column according to claim 5, wherein the concrete is poured in the steel pipe column. 8. The inverted trapezoidal variable cross-section concrete filled steel pipe column according to claim 7, characterized in that: a column foot rib with a hole in the middle is provided in the bottom of the hollow shell, and the column foot rib is arranged horizontally And its plate edge is connected on the inner wall circumference of the hollow shell, and the column foot rib is cut by the stiffening plate; the arc-shaped steel plate vertically arranged on the hollow shell on the upper floor passes downward through the The gap of the sealing steel plate of the hollow shell on the first floor extends into the top of the hollow shell, and a rib in the column with a hole in the middle is arranged in the top of the hollow shell, and the rib in the column is horizontal The bottom end of the arc-shaped steel plate installed vertically on the hollow shell on the upper floor is fixed on the rib in the column, and the rib in the column is arranged and connected to the inner wall circumference of the hollow shell. The plate is cut by the stiffening plate; the space enclosed by the arc-shaped steel plate of the steel pipe column at the top of the hollow shell on the next floor and the vertically arranged arc-shaped steel plate of the hollow shell on the previous floor is the column top space, A column top rib with a hole in the middle is provided in the column top space, the column top rib is arranged horizontally and its plate edge is connected on the inner wall circumference of the column top space, and the column top rib is formed by the column top rib Cut from the stiffening plate; there are several pairs of vertical stiffening ribs between the sealing steel plate and the rib in the column and outside the space at the top of the column, and each pair of stiffening ribs is correspondingly arranged on both sides of the rib in the column; The central openings of the column foot ribs, column middle ribs and column top ribs are flat oval holes.

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