JP2001173265A - Vibration control framed construction - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a vibration control framed construction excellent in vibration control property capable of effectively suppressing responsive vibration extending from a vibration with small amplitude resulted from a strong wind to a large vibration generated in a large earthquake. SOLUTION: This construction comprises a pair of braces 12 and 13 provided within a unit structural surface formed by columns 10 and beams 11a and 11b so that one-side ends 12a and 13a of the braces 12 and 13 are connected to column-beam connection parts 14 and the other ends 12b and 13b are connected to the middle part 15 of the opposed beam 11. One brace 12 is formed of a non-buckling brace having hysteresis damping effect, and the other brace 13 is formed of a brace having viscous damping effect.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a seismic control frame structure in which columns and beams of a steel structure or a steel reinforced concrete structure are reinforced by braces having a damping effect.

[0002]

2. Description of the Related Art Conventionally, as shown in FIG. 4, in order to improve the seismic resistance of a frame constituted by columns and beams, a unit structure constituted by columns 1 and beams 2a and 2b is provided as shown in FIG. A pair of braces 4 having one end connected to the joint 3 between the column 1 and the beam 2a and the other end joined to the center of the opposing beam 2b form an inverted V-shape or a V-shape opposite thereto. (Not shown), a structure called a so-called K-shaped brace frame is adopted. According to such a K-shaped brace frame, the slenderness ratio of the brace 4 is reduced as compared with a case where a brace is installed between diagonal joints of a general column and beam, and the rigidity against compression is greatly increased. Since it increases, there is an advantage that the earthquake resistance of the frame can be improved.

[0003]

However, in the above-mentioned conventional K-shaped brace frame, although the earthquake resistance of the frame can be enhanced by the compressive strength of the brace 4,
Since it does not have a damping effect on the vibration generated in the structure due to a strong wind or an earthquake, a damping effect cannot be expected. Therefore, for a structure that requires a damping effect on the frame, a non-buckling member is used as the brace 4 to suppress the response vibration of the structure due to the hysteresis damping effect of the brace 4. A seismic control framework has been proposed.

However, in such a conventional vibration control frame structure, when the non-buckling type brace is deformed in the elasto-plastic region with respect to an external force acting on the structure, the area of the hysteresis loop is reduced. Since the vibration is attenuated by consumption of the corresponding energy, the damping effect increases or decreases according to the deformation level. For this reason, while exhibiting the desired suppression effect on the response vibration of structures generated during medium-scale and large-scale earthquakes,
There is a problem that it is not possible to obtain a sufficient damping effect for small amplitude vibrations caused by strong winds or small earthquakes.

[0005] A brace having a viscous damping effect is known as another vibration control brace having another damping effect. By the way, this brace is made by laminating a viscoelastic material such as high-damping rubber or polymer compound and a steel plate in a laminated or cylindrical shape, or an oil damper having a similar viscous damping effect in the beam-column structure. It was used as a brace by arranging it diagonally. In a brace using this kind of viscous damping effect, when a relative speed v is generated in the brace due to vibration generated during a strong wind or an earthquake, a resistance force F defined by F = −cv (c is a proportional constant) is used. Since the damping effect for the vibration is obtained, there is an advantage that a predetermined vibration suppressing effect can be obtained even for a vibration having a relatively small amplitude when the relative velocity v is large.

Therefore, instead of the brace 4 shown in FIG. 4, a seismic control frame structure using a brace having the above-mentioned viscous damping effect is also conceivable. For relatively small vibrations caused by moderate earthquakes, etc., the desired damping effect can be obtained with good responsiveness, but it cannot respond to large-scale earthquakes. In addition, since the brace having such a viscous damping effect is generally expensive, if it is used as a substitute for all the braces 4, the construction cost of the entire structure will increase and it will not be economically compatible. is there.

SUMMARY OF THE INVENTION The present invention has been made to effectively solve the problems of the above-mentioned conventional seismic control frame structure, and has an effect ranging from a vibration having a small amplitude due to a strong wind or the like to a large vibration occurring at the time of a large earthquake. It is an object of the present invention to provide a vibration control frame structure which is capable of suppressing response vibrations and is excellent in vibration control.

[0008]

According to a first aspect of the present invention, there is provided a damping frame structure according to the present invention, wherein one end is connected to a joint of the column and the beam in a unit structure surface constituted by columns and beams. In addition, a pair of braces connected to an intermediate portion of the beam whose other end is opposed are provided, and one of the braces is
It is a non-buckling brace having a hysteresis damping effect, and the other brace is a brace having a viscous damping effect.

In the vibration control frame structure according to a second aspect of the present invention, in the first aspect of the invention, the unit structural surface has a multilayer structure and the other end is connected to an upper beam. And a pair of braces whose other ends are connected to the lower beam are alternately arranged in the vertical direction. Furthermore, in the vibration damping frame structure according to claim 3, in the invention according to claim 1 or 2, the pair of braces whose other end portions are connected to the upper beam, and the other end portion of which is lower. The pair of braces connected to the side beam are alternately arranged on a horizontally adjacent construction surface.

According to the present invention, a non-buckling brace having a hysteresis damping effect is used for one of a pair of braces arranged on a K-shaped brace frame, and a viscous brace is used for the other. Since a brace having a damping effect is used, a non-buckling type brace effectively exerts a damping effect on vibration with a large amplitude acting on the frame, and the amplitude is small and the relative displacement speed is low. Vibration damping brace utilizing viscous damping effect effectively exerts damping effect on large vibration. Therefore, according to the damping frame structure according to the present invention, an excellent damping effect can be easily achieved for a wide range of vibrations from small vibrations caused by strong winds to large vibrations caused by a large earthquake. And it can be obtained by an easy structure.

According to the second aspect of the present invention, a pair of braces having an inverted V shape by connecting the other end to an upper beam is provided for a frame having a multilayer structure. And a pair of braces having a V-shape formed by connecting the other end to the lower beam are arranged alternately in the vertical direction, so that the non-buckling type braces and the viscous damping effect can be obtained. Even when an imbalance occurs in the axial force acting on the brace used, non-buckling braces or viscous damping braces having the same damping characteristics are arranged on the same axis, so that multiple layers are used. No excessive force acts on the joints of the beams located between them. In addition, since the non-buckling type braces are continuously arranged in one inclination direction and the braces due to viscous damping are continuously arranged in another inclination direction, the stability of the frame is maintained. You.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS (First Embodiment) FIG. 1 shows a first embodiment which is a basic form of a damping frame structure according to the present invention. This is a K-shaped brace frame in which a pair of braces 12 and 13 are arranged in a unit structure plane constituted by the upper and lower beams 11a and 11b. That is, these braces 12, 13
Has one end 12a, 13a connected to the joint 14 between the column and the lower beam 11a, and the other end 12b, 13b connected to the center 15 of the opposing upper beam 11b.

As one of the braces 12, a non-buckling type brace having a hysteretic damping effect and made of a non-buckling type material which deforms in an elasto-plastic region with respect to an assumed compression and tensile force is arranged. ing. The other brace 13 is formed by sandwiching a viscoelastic material such as high damping rubber or a polymer compound and a steel plate in a laminated or cylindrical shape, or a viscous damping effect such as an oil damper having a similar viscous damping effect. Are disposed.

According to the seismic control framing structure having the above structure, a pair of braces 1 arranged on a K-shaped brace frame are provided.
2 and 13, one of the braces 12 uses a non-buckling type brace having a hysteresis damping effect, and the other brace 13 uses a brace having a viscous damping effect. On the other hand, the non-buckling type brace 12 effectively exerts a damping effect, and the brace 13 utilizing the viscous damping effect effectively damps the vibration having a small amplitude and a large relative displacement speed. Can be demonstrated.

As a result, according to the above-mentioned seismic control frame structure,
An excellent vibration damping effect can be easily obtained with a low-cost structure for a wide range of vibration from a small vibration caused by a strong wind to a large vibration caused by a large earthquake.

(Second Embodiment) FIG. 2 shows a second embodiment of the present invention in which the first embodiment is applied to a multilayer frame, and has the same structure as that shown in FIG. Parts are given the same reference numerals to simplify the description. FIG.
As shown in the figure, this damping frame structure has the other end portions 12b and 13b connected to the center 15 of the beam 11 on the upper side in the structure in which the unit structural surfaces shown in the first embodiment form a multilayer structure. A pair of braces 12, 13 forming an inverted V-shape
And the other end 12b, 13b is located at the center 15 of the lower beam 11.
A pair of braces 1 forming a V shape by being connected to
2, 13 are alternately arranged in the vertical direction.

In the vibration damping frame structure according to the second embodiment having the above-described structure, a pair of braces 12, 1 having an inverted V-shape are provided with respect to a K-shaped brace frame having a multilayer structure.
3 and a pair of V-shaped braces 12 and 13 are alternately arranged in the vertical direction, so that the non-buckling braces 12 having the same damping characteristics are arranged on the same axis, and the other. Are arranged on the same axis.

As a result, according to the above-mentioned seismic control frame structure,
In addition to obtaining the same effects as those shown in the first embodiment, the non-buckling type brace 12 and the brace using the viscous damping effect are used in accordance with the magnitude and relative speed of the vibration acting on the structure. Even when the axial force acting on the beam 13 is unbalanced, no unreasonable torsional force acts on the joint 15 of the beam 11 located between the multilayers. In addition, non-buckling braces 12 are continuously arranged in the direction of inclination from the upper left side to the lower right side in the figure, and the brace 13 due to viscous damping in the direction of inclination from the upper right side to the lower left side in the figure. Are continuously arranged, so that the stability of the frame is maintained.

(Third Embodiment) FIG. 3 shows a third embodiment of the present invention. Similarly, the same components as those shown in FIG. 1 and FIG. Is attached. The seismic damping frame structure includes the braces 12, 1 in the multilayer K-shaped brace frame 20 shown in the second embodiment.
3 and the multilayer K horizontally adjacent thereto.
The braces 12 and 13 in the mold brace frame 21 are symmetrically arranged on the pillar 10 erected between them.

In the vibration damping frame structure shown in this embodiment, in addition to the effects of the first and second embodiments, a non-buckling type is provided according to the magnitude and relative speed of the vibration acting on the structure. Due to the difference in the axial force acting on the brace 12 and the brace 13 utilizing the viscous damping effect, even when an imbalance occurs between the entire frame 20 and the entire frame 21, the brace on the adjacent frame may be used. Since the arrangement of the columns 12 and 13 is symmetrical with respect to the column 10, this can be offset in the two frames 20, 21 and thus the stability of the entire structure can be maintained.

[0021]

As described above, according to the present invention, a non-buckling type brace having a hysteresis damping effect is used as a pair of braces in a K-shaped brace frame. Since the brace using the damping effect is arranged, excellent vibration control effect can be easily achieved for a wide range of vibration from small vibration caused by strong wind to large vibration caused by large earthquake, And it can be obtained by an easy structure.

In particular, according to the second aspect of the present invention, even when an unbalance occurs in the axial force acting on the non-buckling type brace and the brace utilizing the viscous damping effect, the damping characteristic is maintained. Since the same non-buckling type brace or viscous damping brace is arranged on the same axis, an effect is obtained that an unreasonable force does not act on the joint of the beams located between the multilayers. Can be

[Brief description of the drawings]

FIG. 1 is a schematic configuration diagram showing a first embodiment of the present invention.

FIG. 2 is a schematic configuration diagram showing a second embodiment of the present invention.

FIG. 3 is a schematic configuration diagram showing a third embodiment of the present invention.

FIG. 4 is a schematic configuration diagram showing a general K-shaped brace frame.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Column 11, 11a, 11b Beam 12 Non-buckling type brace having hysteresis damping effect 13 Brace having viscous damping effect 12a, 13a One end of brace 12b, 13b The other end of brace 14 Joint of column and beam 15 Beam Center

Claims (3)

[Claims] 1. A pair of columns each having one end connected to a joint portion of the column and the beam and the other end connected to an intermediate portion of the opposing beam in a unit structure formed by the columns and the beams. A brace is provided, and one of the braces is a non-buckling type brace having a hysteresis damping effect, and the other brace is a brace having a viscous damping effect. . 2. A pair of braces, wherein the unit structural surface forms a multilayer, and the other end is connected to the upper beam, and a pair of the brace is connected to the lower beam. The said brace and said brace are alternately arrange | positioned in the up-down direction, The damping framing structure of Claim 1 characterized by the above-mentioned. 3. A pair of braces, the other ends of which are connected to the upper beam, and a pair of braces, the other ends of which are connected to the lower beam, are horizontally adjacent to each other. The damping frame structure according to claim 1, wherein the damping frame structure is alternately arranged on the construction surface.