JP2001003600A - Leg structure of steel framed tower building - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a leg structure capable of attenuating vibration generated in an earthquake in a steel framed tower building. SOLUTION: In a steel framed tower building constituted of a plurality of column members 30 connected to each other by crosspieces 7 and braces, non- connection parts 20 are formed in the columns of the leg part. The brace 10a of the leg is provided with an attenuating mechanism to attenuate the axial force. The column members are vertically jointed in a non-connection condition and the upper side end and the lower side end are fitted to each other so as not to allow the movement in the compression direction and shear direction but to allow the movement in the tensile direction. The attenuating mechanism of the brace is provided with an axial member 12 made of a low yield point steel material and a buckling preventive member 11, 13 preventing buckling and allowing plastic deformation.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a leg structure in a steel tower structure having a plurality of columns connected by cross members and braces.

[0002]

2. Description of the Related Art In a conventional steel tower structure, a pillar material,
The legs are formed by rigidly contacting steel members as cross members and braces. Then, the self-weight from the upper part of the building and the seismic load and wind load as an external force are transmitted to these legs, and act as compressive and tensile forces.

[0003]

In the conventional tower-like building as described above, a large axial force may act on the column member due to the seismic load, and almost no damping can be obtained even if vibration occurs due to the rigid connection structure. In some cases, even greater stress is generated in the steel material. Therefore, there is a problem that it is difficult to construct the tower-like building with a steel structure, or the steel-frame cross section becomes large and the material cost becomes excessive.

[0004] The present invention has been made to solve the above-mentioned problems of the prior art, and an object of the present invention is to provide a leg structure capable of attenuating the vibration caused by an earthquake in a steel tower structure. To provide.

[0005]

According to the present invention, in a steel tower-like building in which a plurality of pillars are connected by cross members and braces, non-joined portions are formed in the pillars of the legs, The brace has a damping mechanism that attenuates the axial force. At the non-joined portion of the pillar, the pillar is connected vertically in a non-joined state, and the upper end and the lower end are fitted to each other and pulled. The brace is configured to allow movement in the compression direction and axial direction while allowing movement in the compression direction, and the damping mechanism of the brace prevents the shaft from low yield point steel and buckling of the shaft. And a leg structure for a steel tower-like building, which is provided with a buckling prevention member that allows plastic deformation.

In the present invention, a length adjusting device for extending and shortening the length of the brace can be connected to the brace having the damping mechanism.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments will be described below with reference to the accompanying drawings, but the present invention is not limited to these embodiments. FIG. 1 is an elevation view of a steel tower-like building according to one embodiment of the present invention,
In FIG. 1, a tower-like building 1 has a
And a brace 6, and the lower section 3 of the tower is constructed in a truss structure over a relatively large plane on the roof of the high-rise building 2. Such a tower-like building 1 is formed on a relatively small plane above the lower section 3 of the tower,
It has a leg structure as indicated by a dotted line A in FIG.

FIG. 2 is an enlarged view of a portion indicated by a dotted line A in FIG. 1 and is a partial sectional view showing a leg structure of the tower-like building 1. As shown in FIG. 1, unbonded braces 10a, 10b, 10c are provided on the legs of the tower-like building 1, as shown in FIG.
Is provided, and the non-joined joint 20 is disposed on the column member 30.

FIG. 3 is a sectional view of the unbonded braces 10a, 10b, 10c taken along the line III-III in FIG.
A steel pipe 11 as a buckling prevention member and a filler 13 are included, and a low yield point steel material 12 having a cross-shaped cross-section is included as a plastically deformable shaft material.
The inside of the steel pipe 11 is filled with a filler material 1 such as mortar.
3 hardened. The low-yield-point steel material 12 has a surface coated with a release material such as a resin so that the low-yield-point steel material 12 can be plastically deformed in the axial direction so as not to adhere to the filler 13. The upper end of the low yield point steel material 12 is connected to the column material 3 via the connection plate 15 and the gusset plate 31.
0, and the lower end is connected to the cross member 7 via a telescopic jack 40 as a length adjusting device.
Is installed so as to be able to expand and contract in the direction of the double arrow D in FIG. On the other hand, the upper and lower ends of the steel pipe 11 are not connected to other members, and the low yield point steel 1
2 and extends in the axial direction, and restrains the low-yield-point steel material 12 through a filler 13 in a direction perpendicular to the axis to prevent buckling.

FIGS. 4 (a) and 4 (b) are perspective views of the non-joint joint 20 disposed on the column 30.
An upper end 30a and a lower end 30b of the column member 30 are formed. As shown in FIG. 4A, the inserted tube 22 is connected to the upper end 30a via a diaphragm 21.
The lower end 30 b is inserted through the diaphragm 24 into the insertion tube 2.
3 are connected. The insertion tube 23 is inserted into the insertion tube 22.
It is formed so that it can be inserted into the inside of the device and its diameter decreases upward. Then, as shown in FIG. 4B, the non-joined joint 20 has the insertion tube 23 inserted into the insertion tube 22 and the lower end of the insertion tube 22 placed on the diaphragm 24. The insertion pipe 23 and the insertion pipe 22 are joined together without using any other joining means such as welding or bolts. Therefore, the upper end 30a of the column member 30 is allowed to float in the axial direction, that is, in the direction of the arrow V (upward) in FIG. 4B, while the shear direction, that is, the double arrow in FIG. In the H direction, it is restrained to such an extent that it is almost impossible to move.

Next, the operation of the leg structure of the tower-like building 1 will be described. When a horizontal force is applied to the tower-like building 1 due to the earthquake, a tensile force acts on a certain column member 30 and the other column member 30
Is subjected to a compressive force. When a tensile force acts on the column 30, the upper end 30 a of the non-joined joint 20 is lifted to prevent the occurrence of tensile stress, while the unbonded braces 10 a, 10 b, and 10 c on the lifted side have a low yield point steel 12. Extend and undergo plastic deformation to absorb the energy of tensile stress, so that the vibration of the tower-like building 1 due to the horizontal force is attenuated.

When a compressive force is applied to the column member 30, the compressive force is transmitted from the lower end of the inserted pipe 22 at the upper end 30a to the lower end 30b via the diaphragm 24 in the non-joined joint 20, The strength of the column material 30 as a whole is exhibited, and in the unbonded braces 10a, 10b, 10c,
Low yield point steel 1 restrained by filler 13 and steel pipe 11
2 opposes the compressive force, and both members share and support the compressive force without yielding. In addition, by the tensile force and the compression force,
When the unbonded brace 10a, 10b, 10c expands and contracts due to residual deformation, the expansion and contraction operation of the expansion and contraction jack 40 is performed to finely adjust this.

[0013]

In the leg structure of the steel tower-like building of the present invention, the brace of the leg has a low yield point steel shaft and a buckle which prevents buckling of the shaft and allows plastic deformation. A non-joining portion of the column material, the column material is connected vertically in a non-joined state, and the upper end and the lower end are fitted with each other and allowed to move in the pulling direction. Since the movement is suppressed in the compression direction and the shear direction, even if an earthquake load acts on the steel tower-like building, the input energy at that time can be greatly attenuated. Therefore, it is possible to reduce the cross section of the steel frame in the steel tower-like building, and to remarkably improve the seismic performance as compared with the conventional steel tower-like building.

[0014]

[Brief description of the drawings]

FIG. 1 is an elevation view of a steel tower-like building according to one embodiment of the present invention.

FIG. 2 is an enlarged partial cross-sectional view of a portion indicated by a dotted line A in FIG.

FIG. 3 is a sectional view of an unbonded brace used in one embodiment of the present invention.

4 (a) and 4 (b) are perspective views of a non-joined joint used in one embodiment of the present invention.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Tower-like building 6 Brace 7 Cross member 10a, 10b, 10c Unbond brace (Brace of leg) 11 Steel pipe (Bucking prevention member) 12 Low yield point steel material (Shaft material) 13 Filler (Bucking prevention member) 20 Non-joint joint (non-joint part) 30 pillar

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Tsuyoshi Iida 2-5-8 Kitaaoyama, Minato-ku, Tokyo F-term within the company group (reference) 3J048 AA06 AC06 BC09 BE10 EA38 3J066 AA01 AA26 BA03 BB01 BD07 BF09 BG04

Claims (2)

[Claims] In a steel tower-like building in which a plurality of pillars are connected by cross members and braces, non-joined portions are formed in the pillars of the legs, and the braces of the legs attenuate the axial force. At the non-joined portion of the column material, the column material is formed vertically in a non-joined state, and the upper end and the lower end are fitted with each other to allow movement in the tensile direction. , Is formed so that movement is suppressed in the compression direction and the shear direction, the damping mechanism of the brace, a shaft made of low yield point steel,
A leg structure for a steel tower-like building, comprising: a buckling prevention member that prevents buckling of the shaft member and allows plastic deformation. 2. The leg structure of a steel tower-like building according to claim 1, wherein a length adjusting device for extending and shortening the length of the brace is connected to the brace having the damping mechanism. .