JP2003090144A - Damping device, damping structure and damping structure - Google Patents

Abstract

(57) [Summary] [PROBLEMS] To prevent a compressive force from acting on a brace material, to enable the brace material to be designed only by a tensile force, reduce cross-sectional performance, reduce the weight of the brace material, and reduce the manufacturing cost. Provided are a vibration damping device, a vibration damping structure, and a vibration damping structure that can be reduced. SOLUTION: In a frame composed of columns 1, 1 and beams 2, 2, an upper side of a plastic body 3 is joined to a central portion of an upper beam 2, and two plastic bodies 3 are provided below the plastic body 3. The brace members 5 and 5 are joined via the gusset plate 4, and the brace members 5 and 5 are respectively joined via the gusset plate 4 to the lower beam-column joint. Compressive deformation releasing devices 6 and 6 are provided at intermediate portions of the brace members 5 and 5, respectively.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vibration damping device, a vibration damping structure which absorbs vibration energy of a structure when a frame of a column or a beam is deformed in a plane due to wind, an earthquake, etc. Regarding damping structure.

[0002]

2. Description of the Related Art Generally, in a wooden structure, a steel frame structure or a steel frame reinforced concrete structure, there is a structure in which a vibration-damping brace material or a vibration-damping damper is installed on the surface as a vibration-damping structure. In such a vibration damping structure, since a compressive force in the axial direction and a bending moment act on the brace material, high sectional performance is required, and there is a problem that manufacturing cost increases and a large installation space is required.

In Japanese Unexamined Patent Publication No. 5-44356, two bracing members made of structural steel are joined to the lower two beam-column joints in the plane of the column and beam, respectively. The other end is joined to the upper beam via a low yield stress steel member, and the vibration control is constructed so that the intersection of the extension lines of the two braces is located on the axis of the upper beam. A structure is disclosed. According to this vibration damping structure, it is possible to reduce the bending moment of each member of the structure so that the cross section of the beam or the brace member is not increased. However, in this damping structure, not only the axial force, that is, the tensile force but also the compressive force acts on the brace member. Generally, steel materials are strong against tensile force but weak against compressive force, and high sectional performance is required to withstand the compressive force. Therefore, in this damping structure, the steel weight of the brace material is There is a problem that it becomes heavy and the cost becomes high.

[0004]

DISCLOSURE OF THE INVENTION The present invention has been made in view of the above problems, and makes it possible to design a brace member only by a tensile force so that a compressive force does not act on the brace member. An object of the present invention is to provide a vibration damping device, a vibration damping structure, and a vibration damping structure that can reduce the weight of the brace material and reduce the manufacturing cost.

[0005]

In order to achieve the above object, a vibration damping device according to a first aspect of the present invention comprises a brace material, a plastic material having a yield strength lower than the yield tensile strength of the brace material, and each brace material. And a compression deformation releasing device which is interposed in any part of the above and does not restrain axial displacement of the brace material due to compression force.

According to a second aspect of the present invention, there is provided a vibration damping structure which is joined to a column or a beam and has a yield strength lower than the yield tensile yield strength of a brace material. It is characterized by comprising a plurality of brace members joined to the heel, and a compression deformation releasing device which is interposed in any part of each brace member and which does not restrain axial displacement of the brace members due to compressive force.

In each of the first and second aspects of the invention, for example, in a shearing mechanism such as a K-type brace or a Y-type brace that receives a shearing force, a compressive force does not act on the brace material, A compression deformation releasing device that does not restrain the axial displacement of the brace material due to the compression force is provided. With this compression deformation release device, since no compressive force acts on the brace material, it is possible to design the brace material only by tensile force, reduce cross-sectional performance, reduce the weight of the brace material, and reduce the manufacturing cost. it can. On the other hand, if only the compression deformation releasing device is provided, when an external force acts,
The same amount of deformation as the amount of deformation of the brace material on the tension side occurs in the compression deformation release device, and a slip type hysteresis characteristic is obtained.However, in the present invention, the yield strength of the end portion of the brace material is the yield tensile strength of the brace material. Since a lower plastic material is provided to prevent plastic deformation of the brace material, the amount of deformation is balanced and slipping does not occur.

A damping structure according to a third aspect is characterized in that the damping structure according to the second aspect is incorporated in a space surrounded by adjacent columns and beams.

According to the third aspect of the present invention, in the vibration control structure including the frame of the pillar / beam and the seismic resistant element such as the brace, the brace can be designed only by the tensile force, and the cross-sectional performance is reduced. As a result, the weight of the brace material becomes lighter, the manufacturing cost is reduced, and a vibration damping structure having a stable hysteresis characteristic without slip is obtained. Here, in each of the above claims, the beam includes the case of a foundation.

[0010]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings. In each figure, the same components are designated by the same reference numerals to simplify the description. Figure 1
It is an elevation view which shows the damping structure which concerns on the 1st Embodiment of this invention. In the present embodiment, in the frame composed of the columns 1, 1 and the beams 2, 2, the upper side of the plastic body 3 is joined to the central portion of the upper beam 2, and The brace members 5 and 5 of the book are joined via the gusset plate 4, and the brace members 5 and 5 are joined to the lower column beam joints via the gusset plate 4, respectively. Compressive deformation releasing devices 6 and 6 are installed in the middle portions of the brace members 5 and 5, respectively.

The material for the columns 1, 1 and the beams 2, 2 may be steel or reinforced concrete, and the cross-sectional shape thereof is not particularly limited. Further, the joint portion between the pillar 1 and the beam 2 may be rigid joint or pin joint.

The brace members 5 and 5 are designed so as to be within the elastic stress of the material against tensile force. Since there is no need to design for compressive force, the shape is not limited and a small cross-sectional dimension can be designed. The material is not particularly limited, but it is preferable to use steel in consideration of tensile properties and cost. In FIG. 1, the brace material 5
Is used as a steel bar.

The plastic body 3 is a portion that bears the external force of the present damping structure, and its yield strength is set lower than the yield tensile strength of the brace material 5. The structure of the plastic body 3 is not particularly limited, but in view of high plastic deformability, manufacturability, and cost, a steel slit damper is desirable as shown in the figure, but if yield strength and deformability are secured. Alternatively, a viscoelastic damper or a friction damper may be used.

In each of the compression deformation releasing devices 6 and 6, as shown in FIG. 6, the brace material 5 is divided at the intermediate portion, and a male screw is formed at each end of the divided brace material 5. The end portions formed with are inserted into the opposing plate portions 7a, 7a of the rectangular frame-shaped connecting member 7, and the nuts 8, 8 are attached to the male screws.
Are screwed together.

Then, as shown in FIG. 6 (b), when an external force P as an axial compression force is applied to the brace member 5, the brace member 5 moves together with the nut 8 in the acting direction of the external force P, whereby the brace member is moved. The material 5 is prevented from being subjected to compressive force, and the brace material 5 is not compressed and deformed. On the other hand, as shown in FIG. 6A, when an external force P as an axial tensile force is applied to the brace member 5, the nut 8 is attached to the plate portion 7.
The brace member 5 is locked by a, and a tensile force is applied to the brace member 5. The material of the end portion of the brace material 5, the plate portion 7a, and the nut 8 constituting the compression deformation releasing device 6 is not particularly limited, but in view of manufacturability and cost, use of steel material is preferable.

The compression-deformation releasing device 6 is not limited to this structure. For example, instead of screwing the nut 8 onto the end of the brace member 5, a bulge (locking) is applied to the end of the brace member 5. Part) is provided, and when an external force as an axial pulling force is applied to the brace material 5, this bulging portion is locked to the plate portion 7a (locking portion), so that a tensile force is applied to the brace material 5. May be.

FIG. 2 is an elevational view showing a vibration damping structure according to the second embodiment of the present invention. In the present embodiment, the plastic body 3 is bonded to a position (left side in FIG. 2) displaced from the central portion of the upper beam 2 in the frame composed of the columns 1 and 1 and the beams 2 and 2, and this plasticity Two brace members 5 and 5 are joined to the lower end portion of the body 3 via a gusset plate 4, and the other end portion of one brace member 5 is a lower one (left side in FIG. 2) beam-column joint. The other end of the brace member 5 is joined to the middle portion of the lower beam 2 via the gusset plate 4. Compressive deformation releasing devices 6 and 6 are installed at the bolt joints at the other ends of the brace members 5 and 5, respectively.

In the present embodiment, as the brace material 5,
Flat steel is used, and the compression deformation release device 6 is
As shown in FIG. 7, the brace member 5, the gusset plate 4 (steel plate), the long hole 11 formed in either the brace member 5 or the gusset plate 4 and extending in the axial direction of the brace member 5, and the length thereof. A bolt 12 that penetrates the brace member 5 and the gusset plate 4 through the hole 11 and is located at the end of the long hole 11 on the brace member 5 side (left side in FIG. 7) and the bolt 12 that can move through the long hole 11. And a nut 13 screwed onto the bolt 12.

Then, as shown in FIG. 7B, when an external force P as an axial compressive force is applied to the brace member 5, the brace member 5 acts with the bolt 12 and the nut 13 in the elongated hole 11 as a function of the external force P. The brace member 5 is prevented from being subjected to a compressive force, so that the brace member 5
Will not be deformed by compression. On the other hand, as shown in FIG. 7A, when an external force P as a tensile force in the axial direction is applied to the brace material 5, the bolt 12 is locked to the inner surface of the elongated hole 11 on the brace material 5 side, and thus the brace material 5 is engaged. A tensile force is applied to 5.

It should be noted that a plurality of such damping structures may be installed in a W-shape in the frame composed of the columns 1, 1 and the beams 2, 2.

FIG. 3 is an elevational view showing a vibration damping structure according to a third embodiment of the present invention. In the present embodiment, the plastic body 3 is joined to the central portion of the lower beam 2 via the mounting member 21 in the frame composed of the columns 1 and 1 and the beams 2 and 2. Two braces 5, 5 on top
Are connected via the gusset plate 4, and the upper end portions of the brace members 5 and 5 are respectively installed at the upper and lower beam-column joints.
It is joined to 6.

In this embodiment, the compression deformation releasing device 6
The fixing plate (plate portion) 22 is welded to the beam-column joint portion, and a male screw is formed at the end portion of the brace material 5,
The end portion where the male screw is formed is inserted into the fixing plate 22, and the nut 8 is screwed to the male screw.

FIG. 4 is an elevational view showing a vibration damping structure according to a fourth embodiment of the present invention. In the present embodiment, in the frame composed of the pillars 1, 1 and the beams 2 and the foundation 31,
The upper ends of the two brace members 5 and 5 are joined to the column-beam joints via the gusset plates 4 and 4, respectively. Further, the lower end of the plastic body 3 is joined to the foundation 31 at the intermediate portion of the columns 2 and 2, and the compression deformation releasing devices 6 and 6 are provided at both ends of the upper end of the plastic body 3, respectively. The lower ends of the brace members 5 and 5 are joined to the compression deformation releasing devices 6 and 6, respectively. The compressive deformation releasing devices 6 and 6 penetrate the plate portion 32 integrally formed at the upper end portion of the plastic body 3 and both end portions of the plate portion 32, and project downward from the plate portion 32. The brace members 5 and 5 each having a male screw formed on the lower end thereof and a nut 8 screwed to the male screw on the lower end.

FIG. 5 is an elevation view showing a vibration damping structure according to the fifth embodiment of the present invention. In the present embodiment, the left end of the plastic body 3 is joined to the center of the left beam 1 in the frame composed of the columns 1 and 1 and the beams 2 and 2, and both the right end portions of the plastic body 3 are joined. The left end portions of the two brace members 5 and 5 are joined to the upper and lower end portions through the gusset plate 4, respectively, and the right end portions of these brace members 5 and 5 are integrated with the brace member joining hardware 41 and 41, respectively. The compression-deformation releasing devices 6 and 6 configured as described above are installed, and the bracing material joining hardware 41 is joined to the gusset plate 4 provided at the upper and lower column beam joining portions on the right side, respectively.
The compression deformation releasing device 6 is a plate portion 7a of a square frame-shaped connecting member 7 that is integrally formed at an end of the bracing material joining hardware 41.
The right end portion of the brace member 5 on which a male screw is formed is inserted through the nut, and the nut 8 is screwed to the male screw.

FIG. 8 is a diagram showing the relationship between the frame inter-layer deformation and the amount of deformation of the brace material in the fourth embodiment of the present invention shown in FIG. Incidentally, since the rigidity of the pillar material is generally higher than that of the brace material, the axial deformation can be ignored. When the deformation of δs occurs in the layer direction, the deformation amount δT of the tension side brace member 5 and the deformation amount δC of the compression side brace member 5 are respectively expressed by the following equations. The amount of deformation at that time is almost the same value as shown in Table 1. Where L
T is the size of the brace member 5 on the tensile side after deformation, LC is the size of the brace member 5 on the compression side after deformation, L0 is the size of the brace member 5 before deformation, H is the distance between the beams, and W is the plasticity from the column 1. The distance to the joint position between the body 3 and the brace material 5, H'is the distance from the upper beam to the plastic body 3, and d is the distance obtained by subtracting H'from H. δT = LT-L0, δC = LC-L0 where H ′ = √ (H ² −δs ² ) -d, LT = √ ((W + δs) ² + H ′ ² ),
LC = √ ((W-δs ) 2 + H '2)

[0026]

[Table 1]

The amounts of deformation of the brace material in the two directions are W and H '.
If the same amount, it will be the same. Therefore, in order to make the amount of deformation of the brace material in the two directions the same, the installation angle of the brace material needs to be symmetrical, but it does not have to pass through the center of the beam-column joint, It does not have to intersect at the beam position (see FIG. 9).

FIG. 10 is a diagram for explaining the history property and the amount of deformation of each part. In the conventional damping structure, the brace material is designed to have high cross-sectional performance and not buckle against compressive force. Since the coefficients are the same,
The same amount of deformation occurs, the plastic body is uniformly deformed, and a stable hysteresis property is obtained (always δC = δT).

In the vibration damping structure of the present invention, since no external force acts on the compression side brace material, only the tension side brace material is deformed. When the external force P acts on the frame in which the vibration damping structure of the present invention is incorporated (see FIG. 10A) and the forced deformation δs occurs in the horizontal direction, at the time point A when the external force P reaches the peak,
Deformation δT occurs in the tension side brace material, and excess deformation δC of the same amount as the elastic deformation amount of the tension side brace material occurs in the compression deformation releasing device on the compression side (Figs. 10 (b), (c) and (d)). reference). After that, at time B when the external force becomes zero, the deformation of the tension side brace material becomes zero, the deformation of the compression side brace material becomes zero, and the deformation δS of the entire layer becomes the deformation δd of the plastic material (FIG. 10 ( e) and (f)). After that, when the horizontal forced deformation is in the opposite direction, a tensile force acts on the compression side brace material in reverse, but the deformation of the compression deformation releasing device is zero, and therefore the tensile deformation is immediately performed (see FIG. )), No slip occurs in the history. Therefore, even if vibration due to wind or earthquake is applied to this vibration control structure, stable history properties will be obtained.

The design yield strength of the entire layer is designed by the yield strength of the plastic material, and the deformation (rigidity) of the entire layer is designed as the cumulative addition of the elastic rigidity of the brace material and the deformation of the plastic material. Further, it is desirable that the brace material is designed to be elastic against a tensile force, and the plastic body is designed to be plastically deformed only in the horizontal direction. If the buckling load of the brace material is low and the compression deformation releasing device is not installed, the compression side of the brace material cannot absorb the excessive deformation, so that the brace material is deformed out of plane. As a mechanism,
This is the same as the case with the device, but it is not desirable because it may damage the plastic material and the interior / exterior material due to out-of-plane deformation. Further, even if the compression buckling load of the brace material is increased, the mechanism is similarly established, but there is no merit of reducing the cross section.
The case where two identical brace members are used has been described above, but if the deformation amounts in the two directions can be made equal,
A plurality of brace members can be appropriately arranged. For example, when using brace materials made of the same material but having different thicknesses, the cross-sectional areas may be the same.

[0031]

As described above, according to the vibration damping device of the first aspect and the vibration damping structure of the second aspect, the bracing material can be designed only by the tensile force, and the cross-sectional performance is reduced. As a result, it is possible to reduce the weight of the brace material, reduce the manufacturing cost, and obtain a stable vibration damping structure with no hysteresis.

Further, according to the vibration damping structure of the third aspect, it is possible to design a vibration damping structure including a frame of columns / beams and seismic resistant elements such as braces by using only the pulling force of the brace material. The cross-sectional performance can be reduced, the weight of the brace material can be reduced, the manufacturing cost can be reduced, and a vibration-damping structure having a stable hysteresis-damping structure without slip can be obtained.

[Brief description of drawings]

FIG. 1 is an elevation view of a vibration damping structure according to a first embodiment of the present invention.

FIG. 2 is an elevation view of a vibration damping structure according to a second embodiment of the present invention.

FIG. 3 is an elevational view of a vibration damping structure according to a third embodiment of the present invention.

FIG. 4 is an elevation view of a vibration damping structure according to a fourth embodiment of the present invention.

FIG. 5 is an elevational view of a vibration damping structure according to a fifth embodiment of the present invention.

FIG. 6 is a diagram showing an example of a compression deformation releasing device according to the present invention.

FIG. 7 is a diagram showing another example of the compression deformation releasing device according to the present invention.

FIG. 8 is a diagram showing a relationship between frame interlayer deformation and the amount of deformation of the brace material.

FIG. 9 is a diagram for explaining an installation position of a brace material.

FIG. 10 is a diagram for explaining the history property of the present invention and the amount of deformation of each part.

[Explanation of symbols]

1 pillar 2 beams 3 plastic 5 brace material 6 Compressive deformation release device

Continued front page    (72) Inventor Koji Fukuda             4-53 Kitahama, Chuo-ku, Osaka City, Osaka Prefecture             Sumitomo Metal Industries, Ltd. F term (reference) 3J048 AA06 AC06 BC09 BE10 BG06                       EA38

Claims (3)

[Claims] 1. A brace material, a plastic material having a yield strength lower than the yield tensile strength of the brace material, and compression that is interposed in any part of each brace material and that does not restrain axial displacement of the brace material due to compressive force. A vibration damping device, comprising: a deformation releasing device; 2. A plastic body joined to a column or a beam and having a yield strength lower than the yield tensile strength of the brace material, and a plurality of brace members joined to the plastic body and any of the column, beam, and beam-column joints. And a compression deformation releasing device which is interposed in any part of each brace member and which does not restrain axial displacement of the brace member due to a compressive force, and a vibration damping structure. 3. A vibration-damping structure, wherein the vibration-damping structure according to claim 2 is incorporated in a space surrounded by adjacent columns and beams.