JP2939067B2 - Structure damping device - Google Patents

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 for a structure capable of suppressing the vibration of the structure caused by an earthquake, wind pressure or the like.

[0002]

2. Description of the Related Art In the field of structural design, in contrast to an earthquake-resistant structure capable of withstanding the impact force of an earthquake or the like by strengthening the foundation structure such as columns and beams of the structure, the vibration control of the structure itself is controlled. A vibration device has been proposed.

[0003] In this vibration damping device, usually, a weight is rotatably attached to the tip of a differential lever provided on an arbitrary floor of a structure,
Amplify the movement of the weight due to the shaking such as an earthquake by leverage ratio,
Generates a large inertial force. The inertial force cancels out the relative deformation of the structure in the horizontal direction caused by the shaking such as an earthquake, and suppresses the shaking of the structure.

However, in a vibration damping device in which an auxiliary mass mechanism that absorbs vibration energy and a support device that bears a long-term load are not independent, torsional deformation due to shaking due to an earthquake or the like is likely to occur in the upper structure. There is a possibility that the auxiliary mass mechanism installed at the lower part may be destroyed by the torsional vibration of. For this reason, in the conventional vibration damping device, it is necessary to prevent such destruction, and there has been an inconvenience that the mechanism is complicated and the installation space is large.

[0005]

SUMMARY OF THE INVENTION The present invention has been made in consideration of the above circumstances, and has as its object to provide a vibration damping device for a structure in which an auxiliary mass mechanism is not destroyed by torsional vibration of an upper structure. .

[0006]

In the vibration damping device for a structure according to the first aspect, an auxiliary mass mechanism for absorbing vibration energy generated by seismic motion and the like and a support mechanism for bearing a long-term load on the upper structure are independent. A frame frame that contacts the upper structure and supports the structure, and a frame damper that is located below the frame frame and bears a long-term load on the upper structure. A supporting portion having a structure for making the natural period longer, and a connecting portion having a structure for connecting the frame frame and the auxiliary mass mechanism and transmitting only horizontal vibration to the auxiliary mass mechanism. And

According to a second aspect of the present invention, in the vibration damping device for a structure, the connecting portion transmits a horizontal vibration generated in the frame to the auxiliary mass mechanism, and rotates the shaft member. A spherical member that freely supports the bearing, a bearing member that holds the spherical member movably in the vertical direction, a box member that is installed on the auxiliary mass mechanism and that stores the bearing member, and the shaft member is fixed to a frame. And a plate member to be formed.

[0008]

According to the structure vibration damping device of the first aspect,
The long-term load of the upper structure is transmitted to the support and the auxiliary mass mechanism via the frame. On the other hand, when vibration due to seismic motion or the like occurs, the vibration energy is absorbed by the auxiliary mass mechanism, but the torsional vibration generated in the upper structure is transmitted from the connection part that has a structure that transmits only horizontal vibration to the auxiliary mass mechanism. It is transmitted to the supporting portion having the structure that makes the natural period of the structure longer, and is not transmitted to the auxiliary mass mechanism. Therefore, since the auxiliary mass mechanism is not destroyed by torsional vibration, the structural planning of the auxiliary mass mechanism can be easily performed.

According to the vibration damping device for a structure according to the second aspect, the shaft member transmits the horizontal vibration generated in the frame to the auxiliary mass mechanism, and the spherical member rotatably moves the shaft member. To pivot. The spherical member is held by a bearing member so as to be movable in the vertical direction. The bearing member is housed in a box member installed in the auxiliary mass mechanism. Further, the shaft member is fixed to the frame by the plate member.
With the connecting portion having such a structure, only the horizontal vibration is transmitted to the auxiliary mass mechanism, and the torsional vibration generated in the upper structure is not transmitted to the auxiliary mass mechanism.

[0010]

1 and 2 show a vibration damping device for a structure according to this embodiment.

The vibration damping device P is installed in an accommodation space 10 provided on an arbitrary floor. The accommodation space 10 is formed between a floor 12 and a ceiling 14 that constitute a structure.

As shown in FIG. 3, a rectangular lower frame 16 is provided below the vibration damping device P. Columns 18 are erected from four corners of the lower frame 16 and support a rectangular upper frame 20 at a predetermined interval.

As shown in FIG. 4, a column 18 is composed of a lower cylinder 22 erected from the lower frame 16 and an upper frame 2.
It is divided into an upper cylindrical body 24 suspended from zero. A disk 26 is welded to the upper surface of the lower cylinder 22. A circular flange 30 welded to one end of a columnar laminated rubber 28 is fixed to the disk 26 with bolts 32.
In the laminated rubber 28, an iron plate and a rubber sheet are alternately stacked in a sandwich shape, and in order to make the distortion applied to the rubber as uniform as possible, the iron plate and the rubber sheet are accurately arranged in a horizontal plane and parallel to each other. The rigidity in the vertical direction is much greater than the rigidity in the direction. The flange 34 at the other end is fixed to a large-diameter disk 36 welded to the lower surface of the upper cylindrical body 24 with bolts 38. As a result, the upper frame 20 and the lower frame 16 can relatively move horizontally, and can also cope with relative torsion. The laminated rubber 28 has a cylindrical stopper 4.
The stopper 40 is bolted to the disc 3
6 is fixed to the outer peripheral portion. When the lower end of the stopper 40 comes into contact with the lower cylinder 22, the relative displacement between the upper frame 20 and the lower frame 16 is restricted to a certain range.

As shown in FIG. 5, the lower frame 16
Are reinforced in a lattice shape by vertical members 44 and horizontal members 46.
The lower frame 1 is provided on the upper surface of the cross member 46 disposed at the center.
6 so as to cross a pair of horizontal bridge members 48 having an H-shaped cross section.
Are arranged in parallel. A pair of horizontal guide rails 5 are provided on the upper surfaces of these horizontal mounting members 48 via angle members 50.
2 are provided.

On the other hand, on the upper surface of the vertical member 44 arranged at the center of the lower frame 16, a pair of vertical members 54 are arranged in parallel to the horizontal member 48 outward. .
On each of the upper surfaces of these vertical mounting members 54, an angle member 50 is provided.
A pair of vertical guide rails 56 is provided through the intermediary.
That is, the vertical guide rail 56 is laid in such a manner that the intermediate portion is divided into the horizontal guide rails 52.

As shown in FIGS. 1 and 2, a guide groove 60 extending in the width direction of a rectangular rigid body 58 is fitted into the vertical guide rail 56, and the horizontal guide rail 5
2, a guide groove 64 extending in the width direction of the rectangular rigid body 62 is fitted. This allows the rigid body 58 to slide in the X-axis direction and the rigid body 62 to slide in the Y-axis direction.

As shown in FIG. 6, guide rails 66 and 68 are fixed to the side surfaces of the rigid body 58 and the rigid body 62 in the longitudinal direction, respectively. A substantially cross-shaped lower auxiliary mass 70 is arranged in a plan view so as to be surrounded by the rigid bodies 58 and the rigid bodies 62. Guide grooves 72 and 74 are provided on four side surfaces of the lower auxiliary mass body 70 projecting in four directions, and are fitted into the guide rails 66 and 68. Thus, the lower auxiliary mass body 70 is slidably supported in the Y-axis direction with respect to the rigid body 58 and slidable in the X-axis direction with respect to the rigid body 62. Also, the lower auxiliary mass body 7
0 indicates a rigid body 58 in the X-axis direction and a rigid body 6 in the Y-axis direction.
Move with 2 The lower auxiliary mass 70 and the rigid body 5
When the relative displacement is small, an elastic body such as rubber may be used for the joining of 8, 62.

On the upper surface of the lower auxiliary mass body 70, eight circular holes 76 are formed at predetermined intervals. These circular holes 7
A cylindrical shaft 78 is inserted into 6. A centering roller bearing (not shown) is provided at the shaft center of these shafts 78, and one end of a shaft 80 is supported by the shaft. The other end of the shaft 80 passes through a shaft hole 84 formed in an end of an arm 82 whose longitudinal direction is arranged in the Y-axis direction. Here, an upper auxiliary mass body 86 having the same shape is provided above the lower auxiliary mass body 70, and is integrally connected to the lower auxiliary mass body 70 via a connection block 88. The lower surface of the upper auxiliary mass body 86 is also provided with a circular hole 90 corresponding to the position where the circular hole 76 of the lower auxiliary mass body 70 is formed.
And a shaft 78 is inserted (shown in FIG. 9).
The end of a shaft 80 is supported on the shaft 78 via a cylindrical bearing (not shown). Thus, the arm 82 is pivotally connected to the lower auxiliary mass 70 and the upper auxiliary mass 86 so as to be rotatable about the shaft 80.

The arm 82 is composed of two superposed plates spaced at a predetermined interval, and is reinforced by a reinforcing plate (not shown) disposed therebetween. Two shaft holes 92 and 94 are formed in the other end of the arm 82, and these shaft holes 92 and 94 are arranged in parallel with the shaft hole 84 and on the longitudinal axis of the arm 82. . Shaft hole 92 located at the tip
, A rod pin 96 and a nut 98 are mounted, and one end of a link member 100 is rotatably connected via a spherical joint (not shown) attached to the rod pin 96. On the other hand, a spherical bearing (not shown) is provided at the other end of the link member 100, and a joint pin 102 is provided.
Journals are rotatably passed through the journal. Further, the leg of the joint pin 102 is connected to the link member 10 with a nut 98.
It is locked so as not to leave from zero. The head of the joint pin 102 is threaded and screwed into a screw hole 104 provided at the longitudinal end of the rigid body 58.

Further, one end of a link member 106 disposed parallel to the link member 100 and shorter than the link member 100 is rotatably connected to the shaft hole 94 of the arm 82 in the same manner as the link member 100. . Here, a rigid body 112 and a rigid body 114 are disposed above the rigid bodies 58 and 62, and the upper auxiliary mass body 86 is connected to the guide rails 108 and 11.
0 and the guide grooves 111, the rigid bodies 58, 62 and the lower auxiliary mass body 70 are slidable in the X-axis and Y-axis directions in the same manner as in the case of the lower auxiliary mass bodies 70, and are rigid bodies in 112 and 114 are connected to the upper auxiliary mass 86
It is movably supported with it. The other end of the link member 106 is rotatably connected to the rigid body 114 similarly to the link member 100. The guide rails 108, 1
10 and the guide groove 111 are formed by the guide rails 66 and 6 described above.
8 and the guide grooves 72 and 74. Therefore, the lever mechanism constituted by the arm 82 and the link members 100 and 106 assists the arm 82 to amplify the relative movement of the floor 12 and the ceiling 14 in the X-axis direction and to assist the movement of the shaft 78 as an amount of movement. Inform masses 70 and 86.

As described above, the four arms 82 arranged in the Y-axis direction, the two rigid bodies 62, the auxiliary mass body 70, and the four link members 100 and 106 constitute four sets of lever mechanisms. Has the same structure,
A set of lever mechanisms are arranged, with the arm 116 oriented in the X-axis direction, to perform a similar function for orthogonal inputs.

Guide grooves 118 are provided on the upper surfaces of the rigid bodies 112 and 114 disposed above, similarly to the guide grooves 60 and 64 of the rigid bodies 58 and 62. The vertical guide rail 120 and the horizontal guide rail 1 are placed on the guide groove 118.
22 is fitted, and a frame 124 assembled in a cross shape is mounted on the frame so as to be slidable in the X-axis and Y-axis directions. As shown in FIG.
The upper frame 20 is disposed on the top 24.

As shown in FIG.
Is assembled in a cross shape as a whole by a vertical member 44 and a horizontal member 46 having an H-shaped cross section, and a central rectangular body 126 is reinforced in a lattice shape by the vertical member 44 and the horizontal member 46. A rectangular body 128 other than the body 126 is reinforced by braces 130. Four corners of the rectangular bodies 126 and 128 are reinforced by gusset plates 132.

The upper frame 20 is reinforced in a lattice shape by vertical members 44 and horizontal members 46 having an H-shaped cross section. The central rectangular body 134 is further reinforced in a lattice shape by the vertical members 44 and the horizontal members 46, and the four corners of the upper frame 20 are also
It is reinforced by vertical members 44 and horizontal members 46.

As shown in FIG. 8, a bearing box 136 is fixed to the center of the rectangular body 126 of the frame 124 with a bolt 140 via a collar 138. A flange bush 142 is fixed to the inside of the bearing box 136 with bolts 144.
Next, a bearing push-up 148 is placed in the bearing case 146.
Is fixed via a bolt 150. A spherical joint 152 in which a bushing spherical concave portion 151 is fitted is provided in the bearing case 146. A shaft 154 is screwed and fixed in the spherical joint 152 to support the upper frame 20 and the frame 124. Between the upper frame 20 and the frame 124, a twist around the axis of the shaft 154 generated in the upper structure is generated. They are joined so that only horizontal load can be transmitted without transmitting vibration. The head 154A of the shaft 154 is screwed with a cylindrical head cap 156, and the upper surface of the head cap 156 is connected to the cover plate 158. The cover plate 158 is joined to the collar 160 welded to the upper frame 20 with bolts 162.

As shown in FIGS. 9 and 10,
An auxiliary member 166 is fixed to the bottom of the rigid bodies 58 and 62,
The screw shaft member 164 can be screwed to the auxiliary member 166. The screw shaft member 164 is connected to a driving device that is operated based on information from a vibration sensor (not shown).
At the time of rotation, the rigid bodies 58 and 62 may be moved in the screw axis direction via the auxiliary member 166 to positively perform the vibration absorbing action. Further, a stopper 168 is provided at the center of each side of the lower frame 16, and the relative displacement between the rigid bodies 58 and 62 and the lower frame 16 is restricted to a certain range.

Next, the operation of the vibration damping device P according to this embodiment will be described. The vibration such as an earthquake acts as a vibration having both the X-axis and the Y-axis components in the horizontal plane. First, the operation of the vibration damping device P for the vibration in the Y-axis direction will be described.

As shown in FIGS. 2 and 10, even if the floor 12 is displaced in the direction of arrow A due to the vibration in the Y-axis direction,
Since the lateral guide rails 52, 122 are arranged in the Y-axis direction, the rigid bodies 62, 114 having the guide grooves 60, 118 fitted in the guide rails 52, 122 have no resistance to the frames 16, 20. Can be relatively displaced. On the other hand, since the guide grooves 60 and 118 fitted in the vertical guide rails 56 and 120 are provided in the X-axis direction, the rigid body 58 and the frame 16 and the rigid body 112 and the frame 20 do not relatively move. However, the rigid body 58
Move relative to the rigid body 112 in the direction of arrow A, and the joint pin 102 (FIG.
The joint pin 102 (point B in FIG. 11) supported by the rigid body 112 moves relatively in the direction of arrow A while keeping the point A (point 1) as it is. This relative movement corresponds to the length L1 on the arm 116.
And the auxiliary mass body 7 amplified by the connecting block 88 as a differential lever force from the lever ratio of L2.
0, 86 and the rigid bodies 62, 114. This is because the rigid body 62 and the auxiliary mass body 70 are
8 and a guide groove 74, and are integrally driven by the vibration in the direction of arrow A. Similarly, the rigid body 114 and the auxiliary mass body 86 are also integrated by the guide rail 110 and the guide groove 111, and the auxiliary mass body 7
This is because the rigid bodies 62 and 114 and the auxiliary mass bodies 70 and 86 move integrally with respect to the vibration in the direction of arrow A, because the rigid bodies 62 and 114 are also connected to the shaft 78 and the shaft 80 via the shaft 80. Therefore, the displacement amount of the floor 12 generated in the direction of the arrow A is amplified by the differential lever force to the rigid bodies 62 and 114 and the auxiliary mass bodies 70 and 86 and transmitted as a large displacement amount, and is synchronized with the movement of the structure. The motion of the rigid bodies 62, 114 and the auxiliary mass bodies 70, 86 as pendulums adds to the structure as an additional mass, thereby increasing the apparent mass, thereby increasing the natural period of the structure and reducing the effect of seismic input. Thus, the response of the structure during an earthquake can be reduced.

On the other hand, in the case of vibration in the X-axis direction, the rigid bodies 62 and 114
The differential lever force is transmitted to 0 and 86.

However, the vibration caused by an actual earthquake or the like is in the X-axis Y
Since the displacements of the shafts in the two horizontal directions are summed up, the auxiliary mass bodies 70, 86 and the rigid bodies 58, 62, 112, 11
Vibration 4 is also the sum of the two horizontal directions, and the auxiliary mass bodies 70, 86 and the rigid bodies 58, 62, 112, 114 move simultaneously in the X-axis direction and the Y-axis direction. In addition, rigid body 5
8, 62, 112 and 114 simultaneously play the role of the weight of the pendulum and the role of the differential lever force transmitting member.

As described above, in the vibration damping device P, the arms 82 and 116 and the link members 100 and 106 having the function of a differential lever and a vibration system as a pendulum synchronized with the movement of the structure are arranged in parallel in the horizontal direction. With the rigid bodies 58, 62, 11
2, 114 simultaneously serve as a differential lever force transmitting member and as a pendulum weight, and the number of members is reduced, so that the accommodation space of the vibration damping device P can be narrowed.

Further, sensors for detecting the amount of displacement are installed on the upper and lower parts of the structure and the mass body, and the driving means means
Screw shaft member 164 according to the amount of displacement of the upper and lower parts of the structure
Is activated to move the mass body while controlling the displacement amount of the mass body, an active vibration damping mechanism can be constituted.

Next, the operation of the vibration damping device P for torsion around the vertical axis in vibrations caused by an earthquake or the like will be described. As shown in FIG. 8, the upper frame 20 and the frame 124 are joined via the spherical joint 152 so as to transmit only a linear load in the horizontal direction. Only the vibration generated in the horizontal direction is transmitted, and the torsional vibration around the vertical axis generated in the upper frame 20 is not transmitted. Accordingly, the torsional vibration generated by the vibration of the upper structure and transmitted to the upper frame 20 is not transmitted to the auxiliary mass mechanism below the frame 124, but is transmitted to the four corners arranged at the four corners via the upper frame 20. Is transmitted to the column 18. The laminated rubber 28 provided in the cylinder 18 has a small horizontal rigidity, and the rubber has a property of removing the load and returning to the original shape, so that the natural period of the upper structure is made longer. In addition, the acceleration response of the structure can be reduced.

The weight of the upper structure is equal to that of the upper frame 2.
Since it is transmitted to zero to four cylinders 18 and these cylinders 18 support the weight of the upper structure, it is not necessary to apply a large load vertically to the auxiliary mass mechanism below the frame 124.

As described above, the vibration damping device P includes the upper frame 2
0 and a support mechanism consisting of a cylinder 18, rigid bodies 58, 62,
Since the auxiliary mass mechanism including the auxiliary mass bodies 112 and 114 and the auxiliary mass bodies 70 and 86 is configured independently, the arms 82 and 116 and the link members 100 and
In addition to preventing destruction of the auxiliary mass mechanism 106 and the like, the configuration of the auxiliary mass mechanism can be simplified.

[0036]

As described above, the structure vibration damping device according to the present invention has a structure in which only the horizontal linear load is transmitted to the auxiliary mass mechanism, and the connection between the upper structure and the auxiliary mass. Since the mechanism is connected, the auxiliary mass mechanism is not destroyed by the torsional vibration around the vertical axis among the vibrations due to the earthquake or the like, and the structural planning of the auxiliary mass mechanism can be easily performed.

[Brief description of the drawings]

FIG. 1 is a front view of a vibration damping device according to the present embodiment.

FIG. 2 is a side view of the vibration damping device according to the embodiment.

FIG. 3 is a perspective view of the vibration damping device according to the embodiment.

FIG. 4 is a partial cross-sectional view of a cylinder of the vibration damping device according to the embodiment.

FIG. 5 is a perspective view illustrating a lower portion of the vibration damping device according to the embodiment.

FIG. 6 is a perspective view illustrating a central portion of the vibration damping device according to the embodiment.

FIG. 7 is a perspective view illustrating an upper portion of the vibration damping device according to the embodiment.

FIG. 8 is a sectional view of a spherical joint part of the vibration damping device according to the embodiment.

FIG. 9 is a sectional view taken along line 9-9 of FIG. 2;

FIG. 10 is a sectional view taken along line 10-10 of FIG. 1;

FIG. 11 is a sectional view taken along line 11-11 of FIG. 1;

[Explanation of symbols]

 18 Cylinder 20 Upper frame 28 Laminated rubber 136 Bearing box 146 Bearing case 148 Bearing push-up 151 Bushing spherical recess 152 Spherical joint 154 Shaft 156 Head cap 158 Cover plate

Continued on the front page (72) Inventor Tatsuharu Ishimaru 4-11-17 Hanaguri, Soka City, Saitama Prefecture (72) Inventor Takahiro Shintani 5-8-16 Maehara Higashi, Funabashi City, Chiba Prefecture (58) Field surveyed (Int.Cl. ⁶ , DB name) E04H 9/02

Claims (2)

(57) [Claims] 1. A vibration damping device for a structure in which an auxiliary mass mechanism that absorbs vibration energy generated by a seismic motion or the like and a support mechanism that bears a long-term load on the upper structure are independent. A frame frame supporting the structure, a support portion having a structure located below the frame frame to bear the long-term load of the upper structure and to make the natural period of the structure longer, and the frame frame; A vibration damping device for a structure, comprising: a connecting portion having a structure for connecting an auxiliary mass mechanism and transmitting only horizontal vibrations to the auxiliary mass mechanism. 2. A shaft member for transmitting a horizontal vibration generated in the frame frame to the auxiliary mass mechanism, a spherical member for rotatably supporting the shaft member, and a vertical direction. A bearing member for movably holding the spherical member, a box member installed on the auxiliary mass mechanism for storing the bearing member, and a plate member for fixing the shaft member to a frame. The structure vibration damping device according to claim 1.