JP2000088048A - Damping device - Google Patents

Abstract

(57) [Summary] [Problem] To provide a simple structure so that a low yield point steel does not yield before it receives an external force such as an earthquake, so as not to always bear a vertical load. To provide an inexpensive vibration damping device that can function as a damper from the time of low amplitude and can improve safety when it acts. SOLUTION: An upper base plate 2 and a lower base plate 3, a plurality of columns 4 made of a steel material with a high yield point and bearing an axial force, and an energy absorbing plate 5 made of a steel material with a low yield point and bearing a shear force, The column 4 was fixed between the upper base plate 2 and the lower base plate 3, and the energy absorbing plate 5 was installed between the columns 4.

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 having a vibration reduction function and a seismic isolation function for structures such as buildings, roads, railways, and the like.

[0002]

2. Description of the Related Art Japanese Patent Laid-Open Publication No.
No. 32045 (hereinafter referred to as “structure damping device”).
Conventional technology 1) or JP-A-5-21484
0, Japanese Patent Application Laid-Open No. 5-214841, Japanese Patent Application Laid-Open
There is a damper of a seismic isolation device for a building (hereinafter, these are collectively referred to as prior art 2) described in JP-A-214842 and JP-A-5-231332.

[0003] Prior art 1 discloses a method in which a vertical high yield point steel material and a vertical low yield point are vertically interposed between an upper base plate fixed to an upper member of a structure and a lower base plate fixed to a lower member of the structure. A steel material is interposed in a superposed state, and upper and lower ends thereof are fixed to an upper base plate and a lower base plate by welding, respectively.

[0004] Further, the prior art 2 comprises a building receiving side receiving body,
Between the ground receiving side receiving body, a metallic damper mainly having a plastically deformable portion having a smaller rigidity above and below a rigid body having a large rigidity, a plastically deformed portion composed of a bent metal rod and provided above and below the rigidly deformed portion. A damper body consisting of a supported part made of metal having a greater rigidity than the plastically deformed part, a damper body consisting of a metallic intermediate part having a metallic coil-shaped part at the top and bottom,
Alternatively, a metal damper mainly subject to plastic deformation is provided.

[0005]

In the prior art 1, since the high yield point steel and the low yield point steel are completely fixed to the upper and lower base plates, the low yield point steel yields under the influence of the axial force. This may hinder the damping function.

[0006] Further, in the prior art 2, the member which is mainly composed of the damper and is easily deformed by plastic always bears the axial force.
At the time of the earthquake, there is a possibility that plastic deformation has already occurred.In addition, since bending hinges are formed at both ends of the damper main body, the proof strength is severely degraded after reaching the maximum proof strength, and it is not enough to absorb the seismic energy. There are problems such as lack of energy absorption capability.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and has a simple structure and always bears a vertical load so that a low-yield point steel does not yield before receiving an external force such as an earthquake. The purpose of the present invention is to obtain an inexpensive vibration damping device which can function as a damper from a low amplitude when an external force such as an earthquake is applied and which can improve safety. .

[0008]

A vibration damping device according to the present invention comprises an upper base plate and a lower base plate, a plurality of struts made of a high yield point steel material and bearing an axial force, and a low yield point steel material made of a low yield point steel material. An energy absorbing plate that bears the energy, the column is fixed between the upper base plate and the lower base plate, and the energy absorbing plate is installed between the columns.

Further, one end of the energy absorbing plate is fixed to an upper base plate or a lower base plate,
Alternatively, a groove is provided on at least one of the opposing surfaces of the upper base plate or the lower base plate, and the other end of the energy absorbing plate having one end fixed to the lower base plate or the upper base plate is inserted into the groove. .

In addition, a reinforcing member made of a material having a higher yield point that absorbs the energy is attached to a part or the outer periphery of the energy absorbing plate, or the supporting column is replaced with a steel material having a high yield point to reduce the restoring force. It is composed of rich materials.

[0011]

[First Embodiment] FIG. 1 is a perspective view of a first embodiment of a vibration damping device according to the present invention, and shows a basic configuration of the present invention. In the drawings, reference numeral 1 denotes a vibration damping device according to the present invention, 2 denotes an upper base plate fixed to an upper member of a structure, and 3 denotes a lower base plate fixed to a lower member of the structure. 4a, 4b, 4c are columns made of a high-yield-point steel material, which are arranged at the center of the upper and lower base plates 2, 3 and at both ends on a line passing through the center. It is fixed to 3. In the following description, the columns 4a, 4b, 4c may be simply described as 4.

[0012] 5a, 5b consists of a low yield point steel struts 4a and 4b, in 4a and 4c energy absorbing plate which is disposed at a gap g ₁ between each of, as shown in FIG. 2 (a) the lower end portion is fixed by welding or the like under the base plate 3, the upper end portion normally the degree of gap g ₂ does not contact thereto are provided between the upper base plate 2. In the following description, the energy absorbing plates 5a, 5a
b may be simply described as 5.

The high-yield point steel material constituting the above-mentioned strut 4 has a yield point in the range of 200 to 700 N / mm ² , preferably 240 to 500 N / mm ^2. The yield point of the low yield point steel material is 50
２４０240 N / mm ² , preferably 80-200 N / mm ² .

The energy absorbing plates 5a and 5b are shown in FIG.
As (b), the arrangement respectively at a gap g ₁ between the posts 4a and 4b, 4a and 4c, one of the energy absorbing plate (e.g., 5a) fixed to an upper end portion of the upper base plate 2 the gap g ₂ is provided between the lower end and the lower base plate 3, the lower end portion of the other energy absorbing plate 5b is fixed to the lower base plate 3, providing the clearance g ₂ between the upper end portion and the upper base plate 2 You may do so. Further, as shown in FIG. 2C, both ends of the energy absorbing plates 5a and 5b are fixed to the upper base plate 2,
It may be provided a gap g ₂ between the lower end portion and the lower base plate 3.

FIG. 3 shows an example of the arrangement of the support 4 and the energy absorbing plate 5. FIG. 3A shows the arrangement of the support 4a to 4c and the energy absorbing plates 5a and 5b on a straight line passing through the center. In the case where the width of the upper member and the lower member of the structure to which the vibration damping device 1 is mounted is small, both ends (shown by broken lines) of the columns 4a to 4c and the energy absorbing plates 5a and 5b are cut off. Good.

FIG. 3 (b) shows the supporting columns 4a to 4 in FIG. 3 (a).
The columns 4d and 4e are provided orthogonally to c, and the columns 4a to 4e are provided.
Between the energy absorbing plates 5a, 5b, 5c, 5
d is provided and formed in a cross shape. FIG. 3 (c) shows a case where a column 4a is provided at the center of the upper and lower base plates 2 and 3, and a plurality of columns 4b, 4c,... , 4n provided between the center column 4a and the columns 4b, 4c,... 4n provided on the outer periphery, and are formed radially. In each example of FIG. 3, the fixing of the energy absorbing plate 5 to the upper base plate 2 or the lower base plate 3 can be appropriately selected according to the example of FIG.

FIG. 4 shows an example of the cross-sectional shape of the column 4. In the present invention, as described later, when the vibration of the structure has a small amplitude, the energy absorbing plate 5 does not contact or slightly contacts the column 4, and when the vibration has a large amplitude, the two contact each other and the energy absorbing plate 5 In order to promote the shearing deformation, it is necessary that the column 4 has a cross-sectional shape that reliably captures the energy absorbing plate 5 when the energy absorbing plate 5 is deformed. For this reason, the above-described various cross-sectional shapes are selected.

As is apparent from the above description, in the present invention, the arrangement of the support 4 and the energy absorbing plate 5 and the cross-sectional shape of the support 4 are determined according to the vibration characteristics of the structure on which the vibration damping device 1 is installed. It can be selected as appropriate.

Next, the operation of the present invention constructed as described above will be described. In normal times, as shown in FIG. 5, the vertical force is borne by the support 4 and the energy absorbing plate 5 is mounted on the upper base plate 2.
(Or lower base plate 3) without incurring a vertical force for gap g ₂ is present between a no-load. When the horizontal amplitude is large at the time of the earthquake, as shown in FIG. 6, a horizontal force and a vertical force act on the vibration damping device 1, and the strut 4 is elastically or plastically deformed. 5 is repeated and acts so as to cause shear deformation. On the other hand, the energy absorbing plate 5 upper end gap g ₂ is provided or a lower end portion, and gap g ₁ on the side end portion provided with the base plate 2 or the lower base plate 3, and in contact with the support column 4, the shearing force Plastically deforms.

When the horizontal amplitude is small due to an earthquake or wind force, as shown in FIG. 7, the strut 4 is elastically deformed, but the energy absorbing plate 5 is connected to the strut 4 and the upper base plate 2 or the lower base plate 3. The gap g ₁ ,
no burden for g ₂ are provided, Wakashi, because the extent a part slightly elastically deformed or plastically at the level no strength problem even when contacting the post 4, the original After completion earthquake Return to the state.

Since the present invention is constructed as described above, when a large horizontal force is applied during an earthquake, first, the energy absorbing plate 5 is subjected to shear yield, and the column 4 having a large restoring force.
The vibration energy is absorbed by repeating and plasticizing the energy absorbing plate 5 to protect the structure. When a small horizontal force is applied, the energy absorbing plate 5 has almost no load or is elastically deformed, and the strut 4 is only elastically deformed. Therefore, the energy absorbing plate 5 can automatically return to the original state. For this reason, it is possible to obtain a vibration damping device excellent in earthquake resistance and durability with a simple configuration using only steel materials.

[Embodiment 2] FIG. 8 is a front view schematically showing Embodiment 2 of the present invention, and FIG.
A sectional view, FIG. 9B is a BB sectional view, and FIG. 10A is a CC sectional view of FIG. In the present embodiment, a groove 6 having a width wider than the thickness of the energy absorbing plate 5 is provided on the lower surface of the upper base plate 2 in the longitudinal direction.
c and the lower end is fixed to the lower base plate 3, and these columns 4a and 4b, 4a and 4
Each is arranged at a gap g ₁ between is c, the lower end of energy absorbing plate 5a which is fixed to the lower base plate 3, the upper 5b, the upper end separates bottom and clearance g ₂ of the groove 6 As described above.

As shown in FIG. 10B, a groove 6 having a substantially T-shaped cross section is formed on the lower surface of the upper base plate 2 in the longitudinal direction.
a may be provided, a flange 51 may be provided at the upper end of the energy absorbing plate 5, and the upper portion of the energy absorbing plate 5 may be inserted into the groove 6a.

In the above description, the case where the grooves 6, 6a are provided in the upper base plate 2 and the upper end of the energy absorbing plate 5 whose lower end is fixed to the lower base plate 3 is inserted into the grooves 6, 6a has been described. a groove 6,6a in the longitudinal direction of the upper surface of the lower base plate 3, the lower portion of the energy absorbing plate 5 the upper end is fixed to the upper base plate 2, so that the lower end separates bottom and clearance g ₂ of the groove 6,6a Groove 6,6a
You may make it insert in.

FIG. 11 is a front view showing another example of the present embodiment, and FIG. 12 is a sectional perspective view taken along the line DD in FIG. In this example, a groove 6 (or a T-shaped groove 6a) is provided in the longitudinal direction of the upper base plate 2 and the lower base plate 3, and the upper and lower portions of the energy absorbing plate 5 are inserted into the upper and lower grooves 6. The lower end of the energy absorbing plate 5 is the lower base plate 3.
Contact with the bottom of the groove 6, between the bottom of the groove 6 in the upper part and the upper base plate 2, the gap g ₂ is formed. Thus, in this example, the energy absorbing plate 5 is disposed between the upper and lower base plates 2 and 3 in a free state.

In the case of disposing the energy absorbing plate 5 as shown in FIG. 2B, as shown in FIG. 11, grooves 6 are provided in the upper and lower base plates 2 and 3, and one of the energy absorbing plates 5 is provided. the upper part of 5a was welded is inserted into the groove 6 of the upper base plate 2, while inserting the distal end portion of the lower into the groove 6 of the lower base plate 3 so as to separate the bottom and clearance g _2, the other energy absorbing plate the lower portion of 5b is inserted into the groove of the lower base plate 3 is fixed by welding, may be inserted upper tip portion into the groove 6 of the upper base plate 2 so as to separate the bottom and clearance g _2.

When the support 4 and the energy absorbing plate 5 are provided as shown in FIGS. 3 (b) and 3 (c), the upper base plate 2 or the lower base plate 3 or both or both are provided with the grooves 6 and one end thereof. Alternatively, the other end or upper and lower ends of the energy absorbing plate 5 to which is fixed may be inserted into the groove 6. According to the present embodiment, the energy absorbing plate 5
Can be restrained in the front-rear direction (plane direction), so that the energy absorbing plate 5 can always be held at a predetermined position and function reliably during an earthquake.

Third Embodiment FIGS. 13 and 14 are front views schematically showing a third embodiment of the present invention. FIG.
In the example 3, the upper end of the support 4 a provided at the center of the upper and lower base plates 2, 3 is made of, for example, the same material as the support 4 a and has an energy absorption plate 5 larger than the outer diameter of the support 4 a.
And a deformation promoting member 7 for promoting the deformation of
Energy absorbing plate 5a, the upper end portion of 5b, the energy absorbing plate 5a, made of a material having higher yield point than 5b, a response to the deformation promoting member 7 and the reinforcing member 8 provided with a notch gap g ₁ is formed It is attached.

It is to be noted that a deformation accelerating member is attached to the upper ends of the columns 4b and 4c on both sides, and a reinforcing member 8 having a cutout corresponding to the deformation accelerating members is attached to the upper ends of the energy absorbing plates 5a and 5b. Well, or columns 4a, 4b,
A deformation promoting member may be attached to all of 4c, and a reinforcing member having a cutout corresponding to the member may be attached to the energy absorbing plate.

FIG. 14 shows an example of the energy absorbing plate 5.
a, 5b, except for a portion fixed to the lower base plate 3 (or the upper base plate 2);
A reinforcing member 8 made of a material having a higher yield point than a and 5b is attached.

According to the present embodiment, a part or the periphery of the energy absorbing plate 5 is reinforced by the reinforcing member 8 made of a material having a higher yield point than the energy absorbing plate 5, so that the reinforcing member 8 is vertically Base plates 2, 3 and columns 4
Alternatively, by hitting the deformation accelerating member 7, the shear deformation of the energy absorbing plate 5 can be promoted.

[Embodiment 4] In this embodiment, the columns 4a provided at the center portions of the upper and lower base plates 2 and 3 of the above-described Embodiments 1 to 3 are omitted. FIG. 15 is a front view schematically showing the present embodiment, and FIG.
In E cross section, the center pillar 4b opposite the line passing through the upper and lower base plates 2,3, 4c are fixed, these two pillars 4b, during 4c, the one at a gap g ₁ on each side An energy absorbing plate 5 is provided, and the lower end is fixed to the lower base plate 3 with a gap g ₂ between the upper end and the upper base plate 2. With such a configuration, the vibration damping device 1 that can be easily manufactured can be obtained.

FIG. 17 is a front view schematically showing another example of the present embodiment, and FIG. 18 is a sectional view taken along line FF of FIG. In this example, four columns 4b, 4c, 4d and 4e are fixed at equal intervals between the upper and lower base plates 2 and 3, and these columns 4b are fixed.
During ～4E, the energy absorbing plate 5 which is formed by joining in a cross shape and arranged at a gap g _1, below the lower end at a gap g ₂ between the upper end portion and the upper base plate 2 base plate 3 is fixed. According to this example,
It is easy to manufacture and can function effectively against vibration in oblique directions. Also in this embodiment, the mounting structure of the energy absorbing plate 5 shown in FIGS. 2 and 2 or the mounting of the reinforcing member 8 to the energy absorbing plate 5 shown in the third embodiment can be performed. it can.

[Use Example] Hereinafter, a use example of the vibration damping device according to the present invention will be described with reference to FIGS. In FIG. 19, reference numerals 11a and 11b denote pillars of a structure made of a steel material;
Reference numerals a and 12b denote upper and lower beams made of a steel material attached between the columns 11a and 11b, and the column frame 10 is formed by the columns 11a and 11b and the upper and lower beams 12a and 12b. 13
Is a trapezoidal brace installed in the main frame 10, and the upper part of the brace 13 is separated from the upper beam 12a by a predetermined distance (this distance corresponds to the height of the vibration damping device 1). The lower end is fixed to the lower beam 12b or the columns 11a, 11b and the lower beam 12b by welding or the like. Then, the vibration damping device 1 according to the present invention is installed between the upper beam 12a and the brace 13, and the upper base plate 2 is provided on the lower surface of the upper beam 12a, and the lower base plate 3 is provided on the upper surface of the brace 13, using bolts or the like. It is fixed.

FIG. 20 shows a state in which the upper and lower beams are installed at the center of a main frame 10 formed by left and right columns 11a and 11b and upper and lower beams 12a and 12b.
An intermediate portion of the stud 14 fixed to a and 12b is cut off, the vibration damping device 1 is installed in this cutout, and the upper and lower base plates 2 and 3 are fixed to the stud 14 by bolts or the like.

FIG. 21 shows that the vibration damping device 1 is installed between a pile 15 buried underground and a footing 16 provided above the pile 15, and the upper base plate 2 is mounted on the footing 16, and the lower base plate 3 is mounted on the pile 15. Each is fixed with bolts or the like.

FIG. 22 shows a footing 16 provided on a pile 15 buried in the ground.
The vibration damping device 1 is installed between the seismic isolation devices 18 provided between the base plate 7 and the base plate 2 and the upper and lower base plates 2 and 3 are fixed to the seismic isolation device 18 by bolts or the like. The vibration damping device 1 may be installed between the pile 15 and the footing 16.

In the vibration damping device 1 according to the present invention installed on a structure as described above, when a horizontal force acts on the structure due to a large earthquake, the energy absorbing plate 5 first yields by shearing and is restored by the strut 4. Since the energy absorbing plate 5 is repeatedly subjected to shear deformation by force, it is easy to protect columns 11a and 11b, beams 12a and 12b, and the like, which constitute the structure and are made of a steel material having a high yield point. In addition, when the vibration damping device 1 is sheared and broken, it can be easily replaced.

When the horizontal force acting on the structure due to an earthquake, wind force, or the like is small, the energy absorbing plate 5 may be plastically deformed, but since the strut 4 is in the elastic range, it is easy to return to the original state. Thus, the safety of the structure can be ensured.

In the above description, the case where a high yield point steel material is used for the column 4 of the vibration damping device 1 has been described. However, the present invention is not limited to this. For example, a large restoring force such as hard rubber can be used. The support 4 may be made of a material having the support 4. Although the case where a plate made of a low yield point steel material is used as the energy absorbing plate 5 has been described, a buckling protection means such as a stiffener may be provided for this.

[0041]

The vibration damping device according to the present invention comprises an upper base plate and a lower base plate, a plurality of columns made of a steel material having a high yield point and bearing an axial force, and an energy absorption made of a steel material having a low yield point and bearing a shear force. A plate was fixed between the upper base plate and the lower base plate, and an energy absorbing plate was installed between the columns. As a result, when a large horizontal force is applied during an earthquake, shear yields, absorbs vibration energy and protects the structure, and when a small horizontal force is applied, it elastically deforms and automatically returns to its original state. Therefore, a vibration damping device excellent in earthquake resistance and durability can be obtained with a simple configuration using only steel materials.

Further, one end of the energy absorbing plate is fixed to the upper base plate or the lower base plate, and the other end is free.
Since the energy absorbing plate does not bear the vertical,
There is no possibility that the energy absorbing plate is plastically deformed, and when an external force such as an earthquake is applied, the energy absorbing plate can function as a damper from a low amplitude.

Also, a groove is provided on at least one of the opposing surfaces of the upper base plate or the lower base plate, and one end of the energy absorbing plate fixed to the lower base plate or the upper base plate is inserted into the groove. Since the movement of the energy absorbing plate in the surface direction is restricted so that the energy absorbing plate is always held at a predetermined position, it can function reliably during an earthquake or the like.

Since a reinforcing member made of a material having a higher yield point than the energy absorbing plate is attached to a part or the outer periphery of the energy absorbing plate, shear deformation of the energy absorbing plate during an earthquake can be promoted.

Since the above-mentioned strut is made of a material having a high restoring force in place of the high-yield-point steel material, it can always bear the vertical force and can increase the restoring force to the original state during an earthquake.

[Brief description of the drawings]

FIG. 1 is a schematic perspective view of Embodiment 1 of the present invention.

FIG. 2 is an explanatory view showing an example of mounting the energy absorbing plate of FIG. 1;

FIG. 3 is an explanatory view showing an example of the arrangement of the columns and the energy absorbing plates of FIG. 1;

FIG. 4 is an explanatory diagram showing an example of a cross-sectional shape of a column shown in FIG. 1;

FIG. 5 is an operation explanatory view of the first embodiment.

FIG. 6 is an operation explanatory view of the first embodiment.

FIG. 7 is an operation explanatory diagram of the first embodiment.

FIG. 8 is a front view schematically showing Embodiment 2 of the present invention.

9 is a cross-sectional view taken along line AA and a line BB of FIG. 8;

10A is a cross-sectional view taken along the line CC of FIG. 8, and FIG. 10B is a cross-sectional view of another example.

FIG. 11 is a front view schematically showing another example of the second embodiment.

FIG. 12 is a sectional perspective view taken along line DD in FIG. 11;

FIG. 13 is a front view schematically showing a third embodiment of the present invention.

FIG. 14 is a front view schematically showing another example of the third embodiment.

FIG. 15 is a front view schematically showing Embodiment 4 of the present invention.

FIG. 16 is a sectional view taken along the line EE of FIG. 15;

FIG. 17 is a front view schematically showing another example of the fourth embodiment.

18 is a sectional view taken along line FF of FIG. 17;

FIG. 19 is an explanatory diagram showing a usage example of the vibration damping device according to the present invention.

FIG. 20 is an explanatory view showing an example of use of the vibration damping device according to the present invention.

FIG. 21 is an explanatory view showing a usage example of the vibration damping device according to the present invention.

FIG. 22 is an explanatory view showing an example of use of the vibration damping device according to the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Vibration suppression device 2 Upper base plate 3 Lower base plate 4 Prop 5 Energy absorption plate 6, 6a Groove 7 Deformation promotion member 8 Reinforcement member

Claims (5)

[Claims] 1. An upper base plate comprising: an upper base plate and a lower base plate; a plurality of struts made of a steel material having a high yield point and bearing an axial force; and an energy absorbing plate made of a steel material having a low yield point and bearing a shear force. A vibration damping device, wherein the support is fixed between the support and a lower base plate, and the energy absorbing plate is provided between the support. 2. The vibration damping device according to claim 1, wherein one end of the energy absorbing plate is fixed to an upper base plate or a lower base plate. 3. A method in which a groove is provided on at least one of the opposing surfaces of the upper base plate and the lower base plate, and the other end of the energy absorbing plate having one end fixed to the lower base plate or the upper base plate is inserted into the groove. The vibration damping device according to claim 1, wherein: 4. The vibration damping device according to claim 1, wherein a reinforcing member made of a material having a higher yield point than the energy absorbing plate is attached to a part or an outer periphery of the energy absorbing plate. . 5. The vibration damping device according to claim 1, wherein the strut is made of a material having a high restoring force, instead of the high yield point steel material.