JP2016194246A - Multiple steel tube-type concrete-filled steel pipe column having plurality of triangular columns, and wall - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a composite steel-concrete member that offers excellent aseismic performance and wind-pressure resistance instead of conventional column and earthquake-resisting wall, the composite steel-concrete member being a structural member offering bending rigidity, axial rigidity, bending strength and axial durability, to be applied to a gigantic column and an earthquake-resisting wall of an ultra high-rise building in a future.SOLUTION: A horizontal cross-section is made rectangular so that geometrical moment of inertia is made as large as possible in a direction exposed to bending moment. A steel plate that contributes the most to withstand the bending moment is made relatively thick, and is disposed on outside. Stability of a triangle is utilized for maintaining stability of the cross-section, and a multiple steel tube member is made by combining a triangular column made of a steel plate as a basic unit. Concrete is filled in an inner space of the multiple steel tube member, to make a multiple steel tube-type concrete-filled steel pipe column having a plurality of boxes.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a steel / concrete composite member and a seismic wall applied when building a building structure or a civil engineering structure.

In structural design, a reasonable member cross-section is required. In recent years, the height, scale, and shape of super high-rise buildings and buildings have been renewed one after another, and new structural members with excellent seismic performance, wind pressure performance, and terrorism performance have been required according to the needs of the times. ing.

In general, the higher the building, the greater the burden of vertical load on the vertical member. The vertical load has two main components. One is its own weight proportional to the height of the building. The other is the additional axial force generated by the overturning moment caused by horizontal forces such as wind loads and seismic loads. Such additional axial force increases geometrically according to the height of the building. The most important issue for engineers is how to bear a huge vertical load. Solutions to this problem include increasing the strength of the material and installing large sections and reasonable vertical members in the building. The present invention proposes and provides a reasonable member cross-section for structural design. In addition, we will propose and provide steel / concrete composite members that have excellent seismic performance, wind pressure performance, and terrorism performance instead of conventional columns and seismic walls. This member is a structural material that can be expected to have bending rigidity, axial rigidity, bending strength, and axial strength, and can be applied to giant columns of future ultra-high-rise buildings and earthquake-resistant walls of ultra-high-rise buildings.

In terms of reasonable member cross sections, in the case of columns, the cross section should be a rectangle with a large second moment in the direction to receive the bending moment. As shown in FIG. 1, the steel plate 1 that contributes most to the bending moment is made relatively thick and arranged outside. However, the direction to receive the bending moment in FIG. 1 is the strong axis direction. Steel plate 1 is a thick steel plate and functions as a flange. Therefore, the thickness of the steel plate 1 is important. In addition, in order to maintain the stability of the cross section, a multi-steel tube steel material is produced by combining triangular prisms as basic units with steel plates using the stability of the triangle, and the interior space of the multi-steel tube steel material is filled with concrete. Thus, a multi-steel tube type concrete-filled steel pipe column having a plurality of boxes is made. The steel material shown in the cross section as shown in FIG. The embodiment shown in this figure is an example of a multi-steel tube type concrete-filled steel pipe column having a plurality of boxes utilizing triangular stability. There are no examples of multi-steel tube-type concrete-filled steel pipes that utilize triangular stability. On the other hand, in the embodiment shown in FIG. 1, the steel plate 1 and the steel plate 3 have a formwork function. The steel plate 3 also has an outer web function. Further, the steel plate 2, the steel plate 21, and the steel plate 22 have a function for isolation. The purpose of installing the separating steel plate is to contribute to the axial rigidity, axial strength, bending rigidity and bending strength of the column, and to divide the column with a large cross section into small parts. When placing concrete in a column with a large cross-section, cracks are likely to occur inside the concrete due to a rise in the temperature inside the concrete due to the hydration reaction. By attaching a plurality of separating steel plates, the volume of each steel tube becomes smaller, and the defective phenomenon due to the hydration reaction can be suppressed. The purpose of suppressing the defective phenomenon due to the hydration reaction is to divide the column with a large cross section into small pieces. Furthermore, the installation of the steel plate 2, the steel plate 3, and the steel plate 22 is advantageous for stress transmission in the strong axis direction by integrating the steel material and the concrete.

FIG. 2 also shows an embodiment of a steel / concrete composite column having a large cross section. This embodiment is another example of a multi-steel tube type concrete-filled steel pipe column having a plurality of boxes in which triangular columns are combined as a basic unit using steel plates by utilizing the stability of the triangle. However, the implementation method is not limited to the embodiment shown in FIGS. In addition, multi-steel tube type concrete-filled steel pipes having a plurality of boxes in which triangular prisms are combined as basic units with steel plates can also be applied to the earthquake resistant wall.

In the embodiment of the steel / concrete composite column with large cross section shown in FIGS. 1 and 2, the conventional main reinforcement, shear reinforcement (or structural reinforcement) 9 and CFT are placed inside each steel tube and outside the entire cross section. An expression mega main muscle 10 can also be installed (not shown).

Adjust the thickness and location of the steel plate 22 for isolation, the ratio of the main reinforcing bar to the main reinforcing bar and the reinforcing bar ratio of the shear reinforcing bar (or structural reinforcing bar) 9, the size and number of CFT mega main bars 10, and the steel ratio This makes it possible to control the strength, rigidity, and deformation performance of giant columns and earthquake-resistant walls.

The steel plates of all the above-described embodiments may use a striped steel plate 43 (see FIG. 4) having small lattice-shaped protrusions 44 on the surface in contact with the concrete in order to increase the adhesion strength between the concrete and the steel material. .

The multi-steel tube-type concrete-filled steel pipe with multiple boxes proposed by the present invention is an innovation for columns and shear walls, and is ideal for large columns and center cores of future ultra high-rise buildings.

Cross section of an example of a huge steel / concrete composite column Cross section of another example of huge steel / concrete composite column Detailed view of an example of an embodiment of a CFT-type mega main bar a) Cross-sectional view of an example of an embodiment of a CFT-type mega main bar b) Part of a cross-sectional view taken along line Y6-Y6 in FIG. 3a) (partially omitted view) Detailed view of striped steel plate

Regarding the embodiments of the steel / concrete composite column and the seismic wall according to the present invention, please refer to (0004) to (0009).

The steel / concrete composite column and the earthquake-resistant wall according to the present invention can be widely used in fields such as the construction industry and the civil engineering construction industry.

1: Steel plate (thick steel plate that functions as a flange)
2: Web (A steel plate that functions as a H-shaped steel web)
3: Steel plate
4: Steel tube
5: Concrete filling
9: Shear reinforcement (or structural reinforcement)
10: CFT-type mega main muscle
11: Main muscle (longitudinal muscle built in CFT mega main muscle)
16: Giber using reinforced steel pipes that protrude on both sides
21: Stiffened steel plate for isolation
22: Steel plate for isolation
41: Steel pipe
42: Ring-type rib
43: Striped steel plate
44: Lattice-like small protrusions

Claims (1)

A step of making a multi-steel tube steel material having a plurality of boxes in which hollow triangular prisms made of steel plates are combined as a basic unit, and a step of filling concrete into the internal space of the multi-steel tube steel material having the plurality of boxes A method for producing a steel / concrete composite column or wall.