CN203669208U - Light-weight meshing type concrete-filled steel tube composite column - Google Patents

Abstract

The utility model discloses a light-duty occlusal steel pipe concrete composite column, which belongs to the field of structural engineering in civil engineering. It is formed by filling concrete in the interlayer of two layers of cold-formed thin-walled steel pipes with longitudinal ribs. The reinforcing rib is trapezoidal in shape, and the reinforcing rib sinks into the interlayer concrete, which can increase the bite force between the steel pipe and the concrete; the material of the steel pipe can be ordinary steel, high-strength steel, stainless steel and refractory steel; the concrete can be ordinary concrete, recycled concrete or high performance concrete. According to the cross-sectional form, it can be divided into square sleeve and circle occlusion light composite column, square sleeve square occlusion light composite column and round sleeve and circle occlusion light composite column. The utility model has the advantages of good mechanical properties, steel saving, light weight, few weld seams, good fire resistance, etc., and can promote the development of this type of composite structure system towards a more economical, light weight, safe and reliable direction.

Description

Light-duty occlusal steel pipe concrete composite column

technical field

The utility model belongs to the field of structural engineering in civil engineering, in particular to a light-duty occlusal steel pipe concrete composite column.

Background technique

Concrete-filled steel tube columns have the advantages of high bearing capacity, good ductility, convenient construction and good economy. This type of structure is widely used in subways, high-rise building structures, industrial plants and bridge structures. However, in actual use, the following problems are still found to be further studied and solved: (1) In order to meet the requirements of the local stability of the steel plate, the thickness of the steel pipe wall is generally thick, and the amount of steel used for the component is large. (2) The section size is larger, so the self-weight is larger, and the influence of earthquake load is larger. (3) The welds of square and rectangular cross-section members are generally located in the corner stress concentration area, so the members are prone to failure first at the welds. (4) All steel materials are exposed to the air, and are easy to lose bearing capacity under the action of fire.

Utility model content

The purpose of this utility model is to provide a light-duty occlusal concrete-filled steel pipe composite column for the above-mentioned deficiencies in the prior art. The square-sleeved circular occlusal lightweight composite column, the square-sleeve square occluded light composite column with square-section outer tube and inner tube, and the circular-sleeve circular occlusal lightweight composite column with circular outer tube and inner tube, In addition, both the outer pipe and the inner pipe are two layers of cold-formed thin-walled steel pipes with longitudinal reinforcing ribs, and the interlayer of the two layers of cold-formed thin-walled steel pipes with longitudinal reinforcing ribs is filled with concrete.

The cross-section of the longitudinal reinforcing rib is trapezoidal, and the reinforcing rib sinks into the interlayer concrete.

The material of the cold-formed thin-walled steel pipe is ordinary steel, high-strength steel, stainless steel or refractory steel.

The common steel is steel with a yield strength below 390MPa, and Q235 or Q345 is selected.

The high-strength steel is steel with a yield strength above 390Mpa, and steel with a strength grade of Q390 or Q420 or higher is selected.

The thin-walled steel pipe refers to the case where the diameter-to-thickness ratio of a circular cross-section is a steel pipe, or for a rectangular cross-section whose width-to-thickness ratio is greater than 1.5 times the local stability limit of a corresponding hollow steel pipe, the presence of filled concrete can slow down or prevent the thin-walled steel pipe from Local buckling; the diameter-thickness ratio or width-thickness ratio of the steel pipe is shown in the table below.

Steel model circular section rectangular section Q235 123.77 75.79 Q345 102.15 62.55 Q390 96.08 58.83 Q420 92.58 56.69

The cross-sectional dimensions of the outer pipe and the inner pipe must meet the hollow ratio of the cross-section between 0.25-0.75; the hollow ratio of the cross-section is defined as d/(D-2t), where d is the outer diameter of the inner steel pipe, D is the outer diameter of the outer steel pipe and t is the wall thickness of the inner and outer steel pipes.

The longitudinal reinforcing ribs are arranged along the entire column height range, and the distance between two longitudinal reinforcing ribs should not be greater than 400mm.

The geometric centroids of the inner tube and the outer tube coincide, and the inner cavity of the inner tube is hollow.

The concrete is ordinary concrete with standard compressive strength less than 60Mpa, recycled aggregate concrete or high performance concrete with compressive strength greater than 60Mpa.

The beneficial effect of the utility model is that compared with the traditional concrete-filled steel tube technology, the utility model has the following characteristics: (1) saves steel, and the use of cold-formed thin-walled steel tubes with longitudinal ribs can effectively reduce the steel consumption of the composite column. (2) The hollow section greatly reduces the self-weight of the structure. (3) The longitudinal ribs improve the local stability of the steel pipe, thereby increasing the compressive and shear bearing capacity of the composite column. (4) There are fewer welds after using cold-formed steel pipes. (5) For rectangular sections, the position of the weld can reasonably avoid the stress concentration area at the corner, thereby effectively reducing the possibility of weld damage. (6) Good fire resistance: On the one hand, in terms of structure, the sandwich concrete can protect the longitudinal ribs and inner steel pipes, and the two layers of thin-walled steel pipes can also effectively prevent the bursting of the sandwich concrete; on the other hand, in terms of materials , the use of refractory steel can further improve the fire resistance of components.

Description of drawings

Figures 1 to 3 are plan views of the composite column.

Figures 4 to 6 are elevation views of the combined columns.

In the figure: 1-cold-formed thin-walled outer steel pipe with longitudinal stiffeners, 2-concrete, 3-cold-formed thin-walled inner steel pipes with longitudinal stiffeners.

Detailed ways

The utility model provides a light-duty occlusal concrete-steel composite column. The occlusal light-duty composite column comprises a square-sleeved round-occlusion light-duty composite column composed of a square-section outer tube 1 and a circular-section inner tube 3, or an outer tube. 1 and inner tube 3 are both square sleeve square occlusion light composite columns with square cross section, and both outer tube 1 and inner tube 3 are circular sleeve circular occlusion light composite columns with circular cross section, and both outer tube and inner tube are two Two layers of cold-formed thin-walled steel pipes with longitudinal ribs are filled with concrete 2. Below in conjunction with accompanying drawing and embodiment the structure of the present utility model is described further.

Embodiment 1: Fig. 1 and Fig. 4 are square sleeve and square occlusal light-duty composite columns with both outer and inner pipes having a square cross-section; the cross-sectional size must meet the requirements so that the hollow ratio of the cross-section is between 0.25-0.75. The section hollow ratio is defined as d/(D-2t), where d is the outer diameter of the inner steel pipe, D is the outer diameter of the outer steel pipe or, and t is the wall thickness of the outer steel pipe.

Embodiment 2: Fig. 2 and Fig. 5 are a square-sleeved round-fitting light-duty composite column whose outer tube is a square tube and the inner tube is a round tube. The section size must meet the requirements, so that the hollow ratio of the section is between 0.25-0.75. The section hollow ratio is defined as d/(D-2t), where d is the outer diameter of the inner steel pipe, D is the outer diameter of the outer steel pipe or, and t is the wall thickness of the inner and outer steel pipes.

Embodiment 3: Fig. 3 and Fig. 6 are the round-sleeved round-fitting light-duty composite column with the outer tube and the inner tube both having circular cross-sections. The section size must meet the requirements, so that the hollow ratio of the section is between 0.25-0.75. The section hollow ratio is defined as d/(D-2t), where d is the outer diameter of the inner steel pipe, D is the outer diameter of the outer steel pipe or, and t is the wall thickness of the inner and outer steel pipes.

In each of the above-mentioned embodiments, during construction: pour a concrete interlayer in two cold-formed thin-walled steel pipes with longitudinal stiffeners whose geometric centroids coincide; the material of the steel pipes can be ordinary steel, high-strength steel, stainless steel or refractory steel; the concrete can be ordinary concrete, recycled concrete or high performance concrete.

Claims (9)

1. the light-duty coupled column of biting connecions, it is characterized in that, the light-duty coupled column of described biting connecions comprises that the light-duty coupled column of square set side's biting connecions, outer tube and inner tube that the light-duty coupled column of square set circle biting connecions, outer tube and the inner tube that are made up of square-section outer tube and circular cross-section inner tube are square-section are the light-duty coupled column of circle cover circle biting connecions of circular cross-section, and outer tube and inner tube are the two-layer cold bending thin wall steel pipe with longitudinal reinforced rib, fill concrete in the two-layer cold bending thin wall steel pipe interlayer with longitudinal reinforced rib.

2. the light-duty coupled column of biting connecions according to claim 1, is characterized in that, the cross section of described longitudinal reinforced rib is trapezoidal shape, and ribs is trapped in sandwich concrete.

3. the light-duty coupled column of biting connecions according to claim 1, it is characterized in that, described thin-wall steel tube refers to the radius-thickness ratio for circular cross-section steel pipe, or be greater than for the flakiness ratio of square-section steel pipe the situation that corresponding cored steel local stability limits 1.5 times, the concrete existence of filling can slow down or stop the cripling of thin-wall steel tube, and the radius-thickness ratio of steel pipe or flakiness ratio value are as shown in the table;

Steel type Circular section Square-section Q235 123.77 75.79 Q345 102.15 62.55 Q390 96.08 58.83 Q420 92.58 56.69

4. the light-duty coupled column of biting connecions according to claim 1, is characterized in that, described longitudinal reinforced rib arranges along whole pillar altitude range, and the distance between two longitudinal reinforced ribs should not be greater than 400mm.

5. the light-duty coupled column of biting connecions according to claim 1, is characterized in that, the geometric centroid of described inner and outer tubes overlaps, and the inner chamber of described inner tube is hollow.

6. the light-duty coupled column of biting connecions according to claim 1, is characterized in that, the material of described cold bending thin wall steel pipe is Q235 or Q345 steel; Q390 or Q420 steel, stainless steel or fire-resistant steel.

7. the light-duty coupled column of biting connecions according to claim 1, is characterized in that, described Q235 or Q345 are the steel below yield strength 390MPa.

8. the light-duty coupled column of biting connecions according to claim 1, is characterized in that, described Q390 or Q420 are steel more than yield strength 390Mpa.

9. the light-duty coupled column of biting connecions according to claim 1, is characterized in that, described concrete is the high performance concrete that the regeneration concrete of the standard compressive strength ordinary concrete that is less than 60Mpa, regenerated aggregate or compressive strength are greater than 60Mpa.

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