JP2000291136A - High damping steel column - Google Patents

Abstract

(57) [Summary] [PROBLEMS] To provide a high damping steel column capable of exhibiting a vibration damping effect on a structure without occupying a structure surrounded by columns and beams at all. SOLUTION: A perforated diaphragm 1c is provided on an outer steel pipe 1b, and an inner steel pipe 1a is inserted into a hole of the perforated diaphragm 1c. Normally, the shear force from the beam 2 is transmitted to the outer steel pipe 1b and not transmitted to the inner steel pipe 1a. In the event of an earthquake or wind, horizontal displacement occurs in the high-damping steel pipe column 1 and the inner steel pipe 1
When the inner diameter portion of the perforated diaphragm 1c abuts on a, the same horizontal displacement occurs in the inner steel pipe 1a as in the outer steel pipe 1b. Since the yield displacement of the inner steel pipe 1a is set to be smaller than the yield displacement of the outer steel pipe 1b,
Until b yields, only the inner steel pipe 1a plasticizes and absorbs seismic energy.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a high-damping steel pipe column that absorbs earthquake energy when a structure undergoes horizontal displacement due to an earthquake or the like and suppresses the vibration of the structure.

[0002]

2. Description of the Related Art In a vibration damping structure for reducing shaking of a building or the like due to an earthquake, wind, or the like, a method of clearly separating a main structure and a vibration damping member is generally used.

[0003] For example, in the invention described in Japanese Patent Application Laid-Open No. 6-57820, the buckling restrained braces are made of a low yield point steel material for the core material and a high yield point steel material for the columns and beams to buckle the seismic energy. Concentrating on the restraining braces, the main frame is prevented from plasticizing.

In the invention described in Japanese Patent Application Laid-Open No. 7-158315, an elasto-plastic damper made of a steel plate provided with a slit is arranged between a wall and a beam (or a column) installed in a construction surface. I have. In this case, similarly, the seismic energy is concentrated on the elasto-plastic damper made of a steel plate provided with slits, thereby preventing the main frame from being plasticized.

[0005]

According to the above two inventions, a large vibration damping effect can be expected. However, in these inventions, since the buckling restrained brace or the elasto-plastic damper as the damping member occupies the structure surrounded by the columns and the beams, a part of the damping member projects into the living room, There are planning problems, such as the inability to provide openings.

Therefore, in the actual design, the performance of the vibration damping structure cannot be sufficiently exhibited, for example, the vibration damping member can be arranged only around the core of the building. The present invention has been made to solve the above-mentioned problems in the prior art, and does not occupy any structural surface surrounded by columns and beams, and is capable of exhibiting a vibration-damping effect. It is intended to provide.

[0007]

A high-damping steel pipe column according to claim 1 of the present application is provided on an outer steel pipe, an inner steel pipe inserted into the outer steel pipe, and provided on the outer steel pipe, and protrudes inside the outer steel pipe. A perforated diaphragm having a hole through which the inner steel pipe can be inserted, wherein a yield displacement of the inner steel pipe with respect to a shear force is set to be smaller than a yield displacement of the outer steel pipe. Things.

When the high-damping steel pipe column of the present invention is applied to a column of a building structure or a civil engineering structure, a beam or a girder is joined at the position of the perforated diaphragm, and the shear force from the beam is always applied to the outer steel pipe. Is transmitted. On the other hand, when horizontal displacement occurs in the column due to an earthquake or wind, the inner diameter portion of the perforated diaphragm comes into contact with the inner steel pipe, so that the same horizontal displacement as the outer steel pipe occurs.

At this time, in the present invention, since the yield displacement of the inner steel pipe is set to be smaller than the yield displacement of the outer steel pipe, only the inner steel pipe is plasticized until the outer steel pipe yields, and the inner steel pipe is mainly formed. Absorb seismic energy. Therefore, if the yield displacement of the outer steel pipe is increased and the yield displacement of the inner steel pipe is reduced, only the inner steel pipe becomes plastic during a large earthquake, and other main structural members can be kept in the elastic range.

[0010] As a setting such that the yield displacement of the inner steel pipe is smaller than the yield displacement of the outer steel pipe, specifically, for example, a metal having a low yield point such as a low yield point steel or an aluminum alloy (not necessarily a yield point) If the outer steel pipe is made of ordinary steel or high yield point steel, or if the inner steel pipe is made of ordinary steel and the outer steel pipe is made of high yield point steel, the cross section of the inner steel pipe is used. Is set smaller than the outer cross-sectional shape, a combination of these may be considered.

According to a second aspect of the present invention, in the high-damping steel pipe column according to the first aspect, the perforated diaphragm and the inner steel pipe are not directly joined to each other, and a small gap is formed between the inner diameter portion of the perforated diaphragm and the inner steel pipe. This is the case when it is formed.

[0012] In order to maximize the energy absorbing capacity of the inner steel pipe, it is desirable that no gap is formed. However, in consideration of errors in the manufacturing accuracy of the steel pipe and the perforated diaphragm, the inner steel pipe is formed with the perforated diaphragm. It may be necessary to set the hole diameter several mm smaller than the hole diameter. However, it is ideally desirable that this gap be as small as possible.

In addition, it is conceivable that padding is applied to the gap. In this case, the padding may be a metal wedge-like pad, or may be a pad made of an elastic material having a cushioning function and a soundproof effect upon contact.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 shows an embodiment of a high-damping steel pipe column according to the present invention, wherein (a) is a vertical sectional view, (b) is an AA sectional view thereof, and (c) is a sectional view thereof. It is BB sectional drawing.

The high-damping steel pipe column 1 in this embodiment is composed of a double steel pipe of an outer steel pipe 1b and an inner steel pipe 1a and a perforated diaphragm 1c, as shown in the figure, and a perforated diaphragm 1c inside the outer steel pipe 1b. The inner steel pipe 1a is inserted into a hole provided at the center of the inner steel pipe.

Although a metal touch may be used between the perforated diaphragm 1c and the inner steel pipe 1a, the diameter of the inner steel pipe 1a may be several mm larger than the diameter of the perforated diaphragm 1c, taking into account an error in the manufacturing accuracy of the steel pipe. I'm making it smaller.

Further, in order to exert the hysteresis damping effect of the inner steel pipe 1a, their cross-sectional shapes and materials are set so that the yield displacement of the inner steel pipe 1a with respect to the shearing force is smaller than the yield displacement of the outer steel pipe 1b.

When such a high-damping steel pipe column 1 is applied to a column of a building structure, a beam 2 is joined to a perforated diaphragm 1c as shown in FIG. However, FIG.
In such a case, the beam 2 may be joined to the outside of the outer steel pipe 1b at the position of the perforated diaphragm 1c.

In this case, normally, as shown in FIG. 3, the shear force from the beam 2 is transmitted to the outer steel pipe 1b. Since the inner steel pipe 1a is not directly joined to the perforated diaphragm 1c, the shear force from the beam is not transmitted to the inner steel pipe 1a.

On the other hand, in the case of an earthquake or wind, as shown in FIG. At this time, since the inner diameter portion of the perforated diaphragm 1c abuts on the inner steel pipe 1a, the same horizontal displacement occurs on the inner steel pipe 1a as on the outer steel pipe 1b.

Since the yield displacement of the inner steel pipe 1a is set to be smaller than the yield displacement of the outer steel pipe 1b, only the inner steel pipe 1a plasticizes and absorbs seismic energy until the outer steel pipe 1b yields. FIG. 5 is a graph showing the relationship. Therefore, if the yield displacement of the outer steel pipe 1b is increased and the yield displacement of the inner steel pipe 1a is reduced, only the inner steel pipe 1a becomes plastic during a large earthquake, and other main structural members can be kept in the elastic range.

FIG. 6 shows a case in which the high-damping steel pipe column 1 of the present invention is applied to a frame A of a building structure. In the case of a frame B having a conventional vibration damping structure shown in FIG. While the damping member 6 occupies the structure surrounded by the columns and the beams in the form, the present invention realizes a vibration damping structure without occupying the structure.

FIG. 8 shows a case where the high-damping steel pipe column 1 of the present invention is applied to a building having an irregular flat surface. Even in the case where the arrangement of the vibration damping member is not easy in the conventional vibration damping structure, the planning becomes easy by applying the high damping steel pipe column 1 of the present invention.

FIG. 9 shows a case where the high-damping steel pipe column 1 of the present invention is applied to a pier D of a road bridge C. In this case, the cross beam 3 is joined to the perforated diaphragm 1c of the high-damping steel pipe column 1, and And the floor slab 5 are supported. in this way,
The high-damping steel pipe column 1 according to the present invention is widely applicable not only to the field of architectural structures but also to the field of civil engineering structures.

FIG. 10 illustrates various cross-sectional shapes of the high-damping steel pipe column 1 according to the present invention. The sectional shape may be arbitrary as long as the required performance is satisfied. The shape of the steel pipe may be any shape such as a square, an ellipse, a polygon, and a solid pipe other than a circle. The combination of the shapes of the inner steel pipe 1a and the outer steel pipe 1b is also arbitrary.

The shape of the perforated diaphragm is not particularly limited, such as a circle, a square, a polygon, and an ellipse. FIG. 11 shows an example of the diaphragm type in the present invention. That is, (a) is a through-diaphragm type in which the outer steel pipe 1b is cut at each position where the perforated diaphragm 1c is provided, and the perforated diaphragm 1c is joined to the outer steel pipe 1b. The inner diaphragm type provided only on the inner side, and (c) shows the case of the combined use of the outer diaphragm type and the inner diaphragm type in which the perforated diaphragm 1c is provided on the outer peripheral portion and the inner peripheral portion of the outer steel pipe 1b.

FIG. 12 shows an embodiment in which the inner steel pipe 1a located inside the outer steel pipe 1b is provided only at the column-beam joint panel portion. Thus, the inner steel pipe 1a does not necessarily have to be provided over the entire length of the high-damping steel pipe column 1.

[0028]

According to the high damping steel pipe column of the present invention, when horizontal displacement occurs in the column due to an earthquake or wind, the inner diameter portion of the perforated diaphragm comes into contact with the inner steel pipe, and the yield displacement of the inner steel pipe is changed to the yield displacement of the outer steel pipe. Since it is set to be smaller, only the inner steel pipe is plasticized until the outer steel pipe yields, and the seismic or wind energy can be efficiently absorbed by plastic deformation of the inner steel pipe.

Further, since the inner steel pipe as the energy absorbing member is housed inside the outer steel pipe constituting the outer surface of the column, there is no occupation of the structure surrounded by the column and the beam, and there is no opening or other building structure, civil engineering work or the like. High degree of freedom in designing structures and the like.

[Brief description of the drawings]

FIG. 1 shows one embodiment of a high-damping steel pipe column of the present invention, in which (a) is a vertical sectional view, (b) is an AA sectional view thereof,
(c) is a BB sectional view.

FIG. 2 is a vertical sectional view showing a state in which a beam member is joined to a diaphragm in the embodiment.

FIG. 3 is a vertical cross-sectional view for explaining transmission of a shear force from a beam member to a high-damping steel pipe column in a normal state in the embodiment.

FIG. 4 is a vertical cross-sectional view for explaining deformation and transmission of force of a high-damping steel pipe column during an earthquake in the embodiment.

FIG. 5 is a graph showing the relationship between the shear force and the horizontal displacement of the outer steel pipe and the inner steel pipe for explaining the principle of the present invention.

FIG. 6 is a front view showing an example in which the high-damping steel pipe column of the present invention is applied to a framework of a building structure.

FIG. 7 is a front view showing an example of a framework of a conventional building structure having a vibration damping structure.

FIG. 8 is a horizontal cross-sectional view showing an example in which the high-damping steel pipe column of the present invention is applied to a building having an irregularly shaped plane.

FIG. 9 is a vertical sectional view showing an example in which the high-damping steel pipe column of the present invention is applied to a pier.

FIG. 10 is a horizontal sectional view showing examples of various sectional shapes of the high-damping steel pipe column of the present invention.

FIG. 11 is a vertical sectional view showing an example of the configuration of the diaphragm in the present invention.

FIG. 12 is a vertical cross-sectional view showing one embodiment when the double pipe structure in the high-damping steel pipe column of the present invention is limited to a column-beam joint panel panel zone.

[Explanation of symbols]

A: Building structure frame according to the present invention, B: Building structure frame by conventional vibration damping structure, C: Road bridge, D: Bridge pier, 1 ...
High attenuation steel pipe column, 1a ... inner steel pipe, 1b ... outer steel pipe, 1c
... perforated diaphragm, 2 ... beam, 3 ... horizontal girder, 4 ... vertical girder, 5
… Floor slab, 6… Damping member

Claims (2)

[Claims] 1. A perforated diaphragm having an outer steel pipe, an inner steel pipe inserted into the outer steel pipe, and a hole provided in the outer steel pipe and protruding inward of the outer steel pipe, the hole being capable of inserting the inner steel pipe. Wherein the yield displacement of the inner steel pipe with respect to shear force is set to be smaller than the yield displacement of the outer steel pipe. 2. The high damping steel pipe column according to claim 1, wherein the perforated diaphragm and the inner steel pipe are not directly joined to each other, and a minute gap is formed between the inner diameter portion of the perforated diaphragm and the inner steel pipe.