JPH09317061A - Brace damper and seismic control structure of building construction using it - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a brace damper which is simple in constitution and low in manufacturing cost by providing a joining part to be rigidly connected to a column or a beam on each end of a seamless tube of circular section made of extremely soft steel. SOLUTION: Brace dampers 20A, 20B in which joining parts 22... are provided on each end of seamless tubes 21, 21 of circular section made of extremely soft steel are prepared. A pair of brace dampers 20A, 20B are arranged in a rectangular space 10 to be surrounded by a column 1, an upper beam 2, and a lower beam 3 to constitute a building. A pair of brace dampers 20A, 20B are diagonally arranged in a line symmetric to the perpendicular axis to split the space 10 in the right-to-left direction. A joining part 22 of each end of the brace dampers 20A, 20B is rigidly connected to gusset plates 31, 32, 32 provided on the column 1, and the beams 2, 3 through connection plates 31a..., 32a....

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a brace damper disposed in a building structure for absorbing vibration energy during an earthquake and a vibration control structure for the building structure using the brace damper.

[0002]

2. Description of the Related Art Development of a brace damper that strengthens the framework of a building structure and absorbs vibration energy is underway. In the process of development so far, as the mechanism of the brace damper, the one that uses the axial force and twist of the shaft member is superior in absorbing the vibration energy due to the earthquake, etc. It has become clear that there are unbonded brace dampers, twist dampers and the like as brace dampers having this type.

Of these, for example, an unbonded brace damper is a cruciform assembled shaft member of ultra-soft steel covered with steel fiber reinforced concrete. The buckling is prevented by cutting off the adhered state, that is, by sliding the shaft member inside the reinforced concrete, and the vibration energy at the time of earthquake is absorbed.

[0004]

However, this unbonded brace damper has the following problems in its manufacturing process.
There is a problem that a process of placing concrete in a precast factory after temporarily assembling steel materials in a steel frame factory is required, which requires a large number of manufacturing steps per unit, a long manufacturing period, and a high manufacturing cost. In addition, there is a problem that the thickness of the wall portion of the building structure in which the damper is installed becomes large because the cross section of the reinforced concrete becomes thick due to the restriction of the reinforcing bar assembly.

The present invention has been made in view of the above circumstances, and can be manufactured with an inexpensive material, and is a brace damper excellent in absorbing vibration energy during an earthquake and a building structure using the same. The purpose is to provide a damping structure.

[0006]

A brace damper according to a first aspect of the present invention is disposed inside a building structure for absorbing vibration energy during an earthquake, and is made of extremely mild steel having a circular cross section. It is characterized in that the tubular member is provided at both ends with joints rigidly connected to columns or beams constituting the building structure.

According to a second aspect of the present invention, there is provided a vibration control structure for a building structure using the brace damper, wherein the brace damper described in the first aspect is a rectangular structure surrounded by columns and beams constituting the building structure. It is characterized in that it is obliquely arranged in the space.

The vibration control structure for a building structure using the brace damper described in claim 3 is the vibration control structure for a building structure using the brace damper described in claim 2, wherein a pair of brace dampers are , A rectangular space surrounded by pillars and beams constituting a building structure is divided into left and right, and is arranged in line with respect to a vertical axis.

[0009]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of a brace damper according to the present invention and a vibration control structure for a building structure using the same will be described with reference to FIGS. In FIG. 1, it is surrounded by adjacent columns 1 and 1 made of H-shaped steel and an upper beam 2 and a lower beam 3 also made of H-shaped steel and vertically erected between the columns 1 and 1 in parallel with each other. A pair of brace dampers 20A and 20B arranged in the rectangular space 10 is shown.

The brace dampers 20A and 20B are jointed to both ends of a steel pipe (tubular member) 21 having a circular cross section, and joint portions 22 rigidly connected to a gusset plate fixed to the column 1 or the upper beam 2 and the lower beam 3. 22 is provided.

The steel pipe 21 is a seamless pipe made of ultra-soft steel, and the material thereof is ultra-soft steel with a carbon content of 0.02%.
Using the following as a guide, the tensile strength is 23 to 27 kg / mm ² , and the yield strength is 10 to 14 kg / mm ² .

The joint portion 22 has substantially rectangular steel plates 24, 24 having the same length as the steel plate 23 and a width of about half along both sides of the substantially rectangular steel plate 23 along the length direction of the steel plate 23. It is welded and has a cross shape when viewed from the end face.

The joint portion 22 includes a steel plate 23 and steel plates 24, 24.
Aligning the axis line of the cross shape with the axis line of the steel pipe 21, the cut portions 25, 25 provided at one end portion,
The peripheral wall surfaces of the steel pipe 21 are fitted into the steel pipe, and then fillet welded from the outside of the steel pipe 21. Also, each steel plate 2
A plurality of bolt holes 26 for connection with the gusset plate are formed in 3, 24, 24 along the length direction of the steel pipe 21.

These pair of brace dampers 20A, 2
0B is arranged in an inverted V shape so as to be line-symmetric with respect to an imaginary vertical axis line 1 that equally divides the space 10 into right and left. Upper beam 2 to which the upper ends of the brace dampers 20A and 20B are fixed
At the center of the upper beam 2, an upper gusset plate 31 combined in a cross shape similar to the joint 22 is welded downward from the lower flange surface 2a of the upper beam 2 to the upper ends of the brace dampers 20A and 20B. Positioned joint 22
The upper gusset plate 31 and the connecting plate 31
It is fixed by a plurality of bolts and nuts via a.

At the joint between the columns 1 and 1 and the lower beam 3 to which the lower ends of the brace dampers 20A and 20B are fixed, between the upper flange surface 3a of the lower beam 3 and the flange surface 1a of the column 1. The lower gusset plates 32, 32 combined in a cross shape similar to the joint portion 22 are welded upward, and the joint portion 22 located at the lower ends of the brace dampers 20A, 20B is welded to the lower gusset plates 32, 3, 3.
It is being fixed to 2 by a plurality of bolts and nuts via a connecting plate 32a.

FIG. 3 shows a case where a horizontal alternating force is applied by an earthquake or the like to the damping structure of the building structure constructed as described above. First, as shown in FIG. 3 (A), when an external force is applied in the direction of arrow X, a tensile force T acts on the brace damper 20A in the axial direction, and a compressive force P in the axial direction on the brace damper 20B. Works. Further, as shown in FIG. 3B, when an external force is applied in the direction of arrow Y, a compression force P acts on the brace damper 20A in the axial direction thereof, and a tensile force T acts on the brace damper 20B in the axial direction thereof. Works.

Here, the brace damper 20A (20
The steel pipe 21 used in B) has a yield strength of 10 to 14 kg.
/ Has a mm ² about performance, it is smaller than the yield strength of the compressive force P and the tensile force T is steel 21 shown in FIG. 3, the steel pipe 21 is elastically deformed without yielding. If the magnitude of the earthquake is large and the compressive force P and the tensile force T are greater than the yield strength of the steel pipe 21, the steel pipe 21 will yield and buckle or spread.

According to the building structure constructed as described above, when a horizontal alternating force is applied due to an earthquake or the like,
Compressive force P acting on the brace damper 20A (20B)
If the tensile force T is smaller than the yield strength of the steel pipe 21, the steel pipe 21 resists the seismic force by the elastic limit proof strength,
It can function as a normal seismic structure and absorb vibration energy during an earthquake. Also, the scale of the earthquake is large,
Compressive force P acting on the brace damper 20A (20B)
If the tensile force T is larger than the yield strength of the steel pipe 21, the steel pipe 21 yields, and buckling or spreading occurs, whereby the vibration energy of the earthquake can be absorbed.

In addition, the brace damper 20A (20
In B), a steel pipe 21 having a diameter of about 150 to 300 mm is adopted, but the finish is extremely thin compared to a conventional brace damper having the same vibration energy absorption performance, so it is installed like a conventional brace damper. There is no problem that the thickness of the wall is increased, and the construction part can be finished beautifully.

Moreover, the brace damper 20A (20
Since B) has a simple structure and can be manufactured with an inexpensive material, its manufacturing cost can be kept low.
Further, in this regard, it is possible to reduce the construction cost even when the seismic control structure is regenerated by replacing the plastically deformed one with a new brace damper.

Next, another embodiment of the seismic control structure for a building structure using a brace damper is shown in FIG. In the seismic control structure of this building structure, the brace damper 20A has a space 1
It is arranged by itself so as to partition 0 at an angle.
Since the brace damper 20A has a stable energy absorption performance against both compressive force and tensile force by adopting the steel pipe 21, even if only one side is arranged in the space 10, the brace damper 20A is sufficiently vibrated during an earthquake. Can absorb energy.

[0022]

As described above, according to the brace damper described in claim 1, when the seismic force applied to the building structure is transmitted as a compressive force or a tensile force acting in the axial direction of the brace damper, If the compressive or tensile force is less than the yield strength of the tubular member, the tubular member will not yield and will elastically deform, and if the compressive or tensile force is greater than the yield strength of the tubular member, the tubular member will yield and buckle or expand. Cause delay. That is, it is possible to absorb vibration energy at the time of an earthquake by utilizing the axial force of the tubular member made of ultra-soft steel or by breaking the annular member. Also,
The brace damper is a tubular member made of ultra-soft steel with a circular cross section with joints that are rigidly connected to columns or beams at both ends.The brace damper has a simple structure and can be manufactured with an inexpensive material, so its manufacturing cost is low. Can be suppressed.

According to the seismic control structure for a building structure using the brace damper described in claim 2, the brace damper is slanted in a rectangular space surrounded by columns and beams constituting the building structure. When a horizontal alternating force is applied to the building structure due to the earthquake, a compressive force and a tensile force alternately act on the brace damper in the axial direction, and the compressive force and the tensile force yield to the tubular member. If the strength is smaller than the strength, the tubular member resists the compressive force and the tensile force due to the proof stress within the elastic limit, and functions as a normal seismic resistant structure to absorb vibration energy during an earthquake. Further, if the magnitude of the earthquake is large and the compressive force and the tensile force acting on the brace damper are larger than the yield strength of the tubular member, the tubular member will yield and plastically deform to absorb vibration energy during the earthquake. As a result, the building structure can be effectively damped.

According to the vibration control structure for a building structure using the brace damper described in claim 3, the pair of brace dampers left and right in a rectangular space surrounded by columns and beams constituting the building structure. It is arranged symmetrically with respect to the vertical axis that is divided into two parts.When a horizontal alternating force is applied to a building structure due to an earthquake, the seismic damping characteristics of each brace damper are equally exerted against the force acting from both sides. It is possible to absorb the vibration energy during an earthquake more effectively.

[Brief description of drawings]

FIG. 1 is a side plan view showing an embodiment of a vibration control structure for a building structure using a brace damper according to the present invention.

FIG. 2 is a perspective view showing a brace damper.

FIG. 3 is a state explanatory view showing the balance of the brace damper forces when a horizontal alternating force is applied to the building structure.

FIG. 4 is a side plan view showing another embodiment of a vibration control structure for a building structure using a brace damper according to the present invention.

[Explanation of symbols]

 1 pillar 2 upper beam 3 lower beam 10 space 20A, 20B brace damper 21 steel pipe (tubular member) 22 joint

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification code Office reference number FI Technical display location E04B 2/56 651 E04B 2/56 651L 651S 652 652L 1/18 1/18 F

Claims (3)

[Claims] 1. A brace damper disposed inside a building structure for absorbing vibration energy during an earthquake, wherein the building structure is formed at both ends of a tubular member made of extra soft steel having a circular cross section. A brace damper characterized in that it is provided with a joint that is rigidly connected to a pillar or beam. 2. A brace damper according to claim 1, wherein the brace damper is obliquely arranged in a rectangular space surrounded by columns and beams that form the building structure. The damping structure of the used building structure. 3. The vibration control structure for a building structure using the brace damper according to claim 2, wherein a pair of brace dampers are arranged in line symmetry with respect to a vertical axis that divides the space into left and right. The seismic control structure of the building structure using the brace damper.