JP2004190424A - Vibrational energy absorbing structure - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To construct a vibrational energy absorbing structure for restraining swinging of a structure by an earthquake and a strong wind between a pile and the structure. <P>SOLUTION: Vibrational energy can be efficiently absorbed by arranging a mechanism for absorbing the vibrational energy between the pile 10 and a foundation part 12. Reforming work at deteriorated time is facilitated since there is no need to support the structure by laminated rubber like a base isolation device. A damping device 30 constitutes a shape variable triangular link of a pair of second arms 36 and a pair of arms 42, and amplifies displacement of a first ball joint 44 by a second ball joint 38. Thus, displacement of a steel bar 20 is absorbed by being efficiently converted into heat by a damper arranged between the second ball joint 38. <P>COPYRIGHT: (C)2004,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a vibration energy absorbing structure that absorbs vibration generated in a structure supported by a pile due to an earthquake or the like.
[0002]
[Prior art]
In the field of structural design of buildings, there is a concept of vibration suppression and seismic isolation to suppress or control seismic force to suppress vibration of the building due to seismic force. Conventionally, however, vibration suppression is a vibration damping mechanism in a building, and as shown in FIG. 13, a foundation 100 is supported by a pile 100, and a seismic isolation device 106 is provided between the building 104 and the foundation 102. There are few examples in which a seismic isolation mechanism to be arranged is mainly used and attention is paid to a pile supporting a building to absorb vibration energy acting on the building (for example, see Patent Document 1).
[0003]
Usually, the pile 100 and the foundation 102 are fixed, and when an earthquake occurs, the swaying of the foundation 102 is reduced by the restraining force of the head of the pile 100, but as shown in FIG. , A bending moment M is generated, and the head 100A may be damaged due to bending stress.
[0004]
[Patent Document 1]
JP 2001-303590 A
[Problems to be solved by the invention]
In consideration of the above facts, the present invention constructs a vibration energy absorbing structure between a pile and a structure, which suppresses the vibration of the structure due to an earthquake or a strong wind, and efficiently absorbs vibration energy. It is an object of the present invention to prevent the head from being damaged.
[0006]
[Means for Solving the Problems]
The invention according to claim 1 is a pile constructed underground, a pin bearing provided at the head of the pile, rotatably supporting a foundation of a structure, and a lower end portion of the head of the pile. An axial force transmitting member that is connected rotatably downward and an upper end portion penetrates the base portion, and the base portion and the pile that are disposed on the base portion and that are transmitted through the axial force transmitting member. And a damping means for amplifying and attenuating the relative displacement of.
[0007]
According to the first aspect of the present invention, a pin bearing is provided on the head of a pile constructed underground, and the foundation of the structure is rotatably supported by the pin bearing. By this pin bearing, the base and the head are relatively displaced below the pile while maintaining the same displacement. Below the head of the pile, the lower end of the axial force transmitting member is rotatably connected. The axial force transmitting member is connected to the damping means arranged on the foundation, and the damping means amplifies the relative displacement between the foundation and the pile transmitted through the axial force transmitting member to reduce the damping effect. Improve.
[0008]
As described above, by providing the mechanism for absorbing vibration energy between the pile and the foundation, vibration energy can be efficiently absorbed. Also, unlike the seismic isolation device, there is no need to support the structure with laminated rubber or the like.
[0009]
Further, by supporting the foundation of the structure with the pin bearing, the bending moment of the head of the pile can be made close to zero. For this reason, the deformation of the head is apparently increased by connecting the head and the base, but the deformation is not increased by the damping means, and the bending stress acting on the head is greatly reduced.
[0010]
The invention according to claim 2 has a rigidity increasing means for increasing rigidity of a coupled system between the foundation and the pile according to an amplification factor of a relative displacement between the foundation and the pile of the damping means. It is characterized by:
[0011]
In the invention according to claim 2, the rigidity increasing means increases the rigidity of the coupled system between the foundation and the pile in accordance with the amplification factor of the relative displacement between the foundation and the pile of the damping means. The structure is restrained and deformation due to vibration of the structure is reduced.
[0012]
According to a third aspect of the invention, the damping means is connected to a first joint member rotatably connected to an upper end of the axial force transmitting member, and one end is rotatably connected to the first joint member. A pair of first arms extending obliquely in a direction away from each other with the axial force transmitting member interposed therebetween, a second joint member respectively connected to the other end of the first arm, and a second joint A damper connected to the member and restricting relative movement between the second joint members; and one end rotatably connected to the second joint member and extending obliquely in a direction approaching each other with the first arm interposed therebetween. And a third joint member to which the other end of the second arm is connected and which is rotatably attached to a beam or a pillar on a foundation. Features.
[0013]
According to the third aspect of the present invention, the other ends of the pair of second arms are connected by a third joint member rotatably attached to a column or a beam, and the second joint member attached to one end of the second arm. Are connected by a damper, thereby forming a triangular link having a variable shape by the second arm and the damper.
[0014]
Further, by connecting one end of a pair of first arms with a first joint member and connecting the other end of the first arm with a second joint member, a triangular link that is variable in shape by the first arm and the damper is configured. are doing.
[0015]
That is, a triangular link is configured by the first arm and the damper inside the triangular link between the second arm and the damper.
[0016]
Since the upper end of the axial force transmitting member is connected to the first joint member, when the base portion and the pile are relatively displaced due to an earthquake or the like, the axial force transmitting member is displaced in the axial direction.
[0017]
Therefore, a force acts to push up or pull in the first joint member via the axial force transmitting member. Thereby, the angle of the first arm about the first joint member expands and contracts, and the interval between the second joint members changes because the foundation and the pile are amplified more than the relative displacement.
[0018]
That is, the axial displacement of the axial force transmitting member is converted to the displacement of the axial force transmitting member in the perpendicular direction and amplified, and the vibration energy is efficiently converted into heat by the damper provided between the second joint members. Converted and absorbed (small relative displacement between foundation and pile x large force = large displacement between second joint members x small force of damper).
[0019]
The invention according to claim 4 is characterized in that the rigidity increasing means is a spring material for connecting the second join members.
[0020]
According to the fourth aspect of the present invention, the rigidity increasing means is configured by connecting the second joint members to each other with a spring material. That is, by arranging the spring material in parallel with the damper, the rigidity of the coupled system between the foundation and the pile is increased. Further, if the spring member is provided with an initial tensile force, the rigidity of the coupled system between the foundation and the pile is further increased.
[0021]
The invention according to claim 5 is characterized in that the damping means has a fourth joint member to which an upper end of the axial force transmitting member is rotatably connected, and one end having a predetermined angle with the axial force transmitting member. A third arm rotatably connected to the fourth joint member, a fifth joint member rotatably attached to a beam or a pillar on a base portion at the other end of the third arm, And a damper connected to the fourth joint member and rotatably mounted on the base portion or the column and restricting movement of the fourth joint member.
[0022]
According to the invention described in claim 5, the toggle damping device is constituted by the third arm and the axial force transmitting member. The third arm and the axial force transmitting member are connected by the fourth joint member so that the angle formed by the third arm and the axial force transmitting member becomes a predetermined angle, and the damper is connected to the fourth joint member. I have. The fourth joint member moves due to an axial displacement of the axial force transmitting member.
[0023]
And even if the foundation and the pile are relatively displaced in the horizontal direction or the vertical direction due to an earthquake or the like, the fourth joint member is largely moved by the toggle mechanism, and the damper is largely deformed.
[0024]
Therefore, a relationship of small deformation × large force = large deformation × small force is established, and the damper connected to the fourth joint member absorbs the vibration of the structure by the small force. In addition, since small displacements of the foundation and the pile are amplified and absorbed by large displacements, vibrations caused by small and medium-sized earthquakes and winds can be effectively absorbed.
[0025]
The invention according to claim 6 is characterized in that the toggle damping device is disposed symmetrically in a frame composed of beams and columns, and the left and right fourth joint members are connected by a spring member. . In addition, if the spring member is installed with an initial compression force applied thereto, the rigidity of the coupled system between the foundation and the pile can be increased.
[0026]
According to the sixth aspect of the present invention, the left and right fourth joint members are connected by a spring member to limit mutual movement. Thus, the posture of the toggle damping device is normally maintained, and the device does not shake more than necessary.
[0027]
The invention according to claim 7 is characterized in that the axial force transmitting member is housed in a pipe having a diameter that is large enough to prevent contact due to relative displacement between the foundation and the pile.
[0028]
According to the seventh aspect of the present invention, since the axial force transmitting member is housed in the pipe, even if it is backfilled or solidified around the pile, it does not affect the movement of the axial force transmitting member. Further, since the diameter of the tube is set so as not to contact the axial force transmitting member even when the axial force transmitting member moves, the axial force transmitting member is not damaged.
[0029]
The invention according to claim 8 is a pile constructed underground, a rolling bearing provided at a head of the pile, and supporting a foundation of a structure, and a lower end part is provided below the head of the pile. An axial force transmitting member rotatably connected and having an upper end portion penetrating through the base portion; and a relative displacement between the base portion and the pile, which is disposed on the base portion side and transmitted via the axial force transmitting member. And attenuating means for amplifying the signal and attenuating it.
[0030]
According to the invention described in claim 8, the base portion is supported by a rolling bearing provided on the head of the pile constructed underground, and the relative displacement between the head of the pile and the base is allowed. A lower end of the axial force transmitting member is rotatably connected below the pile. This axial force transmitting member is connected to the damping means arranged on the base portion side, and amplifies the relative displacement between the base portion, the pile head, and the lower portion of the pile transmitted through the axial force transmitting member. And attenuate.
[0031]
In addition, by supporting the foundation of the structure with the rolling bearing, the bending moment of the head of the pile can be made close to zero. Therefore, the bending stress acting on the head is greatly reduced.
[0032]
According to a ninth aspect of the present invention, there is provided a rigidity increasing means for increasing rigidity of a coupled system between the foundation and the pile according to an amplification factor of a relative displacement between the foundation and the pile of the damping means. It is characterized by:
[0033]
BEST MODE FOR CARRYING OUT THE INVENTION
As shown in FIGS. 1 and 2, the vibration energy absorbing structure according to the first embodiment is constructed between a pile 10 and a foundation concrete 12 of a building supported by the pile 10. The pile 10 is a steel pipe, a concrete pile, or the like, and is driven so that the tip reaches the support layer from the soft ground. In addition, even if it is a friction pile, the effect of the present invention can be exhibited.
[0034]
A pin bearing 14 is arranged on the head of the pile 10 and is connected to the foundation concrete 12. By using the pin bearing 14, the bending moment M of the head of the pile 10 shown in FIG. 4 is theoretically zero, and the vertical load is supported without restricting the bending of the foundation concrete 12. In addition, the pin bearing can also be configured by capping the head of the pile.
[0035]
A mounting ring 16 is fixed below the head of the pile 10. The lower end of a steel rod 20 as an axial force transmitting member is connected to the mounting ring 16 via a ball joint 18, and the angle of the steel rod 20 with respect to the pile 10 can be changed.
[0036]
The steel rods 20 extend obliquely at about 45 degrees in a direction away from each other, and the upper end of the steel rod 20 passes through a through hole 22 formed in the foundation concrete 12. A flexible pipe 24 is disposed between the through-hole 22 and the mounting ring 16, and the steel rod 20 passes through the flexible pipe 24. Thereby, even if the periphery of the pile 10 is hardened with the chemical solution, the movement of the steel bar 20 is not affected. Further, since the diameter of the flexible pipe 24 is set to a size that does not make contact even when the steel rod 20 moves, the steel pipe 20 is not damaged.
[0037]
On the other hand, a pillar 26 is raised from the foundation concrete 12 coaxially with the pile 10, and a beam 28 is bridged over the pillar 26 to form a frame. The third ball joint 32 of the damping device 30 is rotatably supported on the mounting plate 34 of the beam 28. The upper ends of the pair of second arms 36 are connected to the third ball joint 32. The second arm 36 extends obliquely downward in a direction away from each other with the third ball joint 32 as a vertex.
[0038]
A second ball joint 38 is attached to a lower end of the second arm 36. By connecting the left and right second ball joints 38 with a damper 40, the second arm 36 and the damper 40 form a triangular link having a variable shape. A coil spring 41 is inserted through the damper 40, and both ends of the coil spring 41 are connected to the second ball joint 38.
[0039]
One end of a pair of first arms 42 is connected to the second ball joint 38, and the other end of the first arm 42 is connected to the first ball joint 44. Thus, a triangular link whose shape is variable by the first arm 42, the damper 40 and the coil spring 41 is formed inside the link between the second arm 36, the damper 40 and the coil spring 41.
[0040]
The upper end of the steel bar 20 is connected to the first ball joint 44. In order to prevent the steel bar 20 from interfering with the damper 40, a loop portion 20A is formed at an upper end portion of the steel bar 20, and the damper 40 penetrates the loop portion 20A.
[0041]
Next, the operation of the vibration energy absorbing structure according to this embodiment will be described.
[0042]
As shown in FIG. 3, for example, when the foundation concrete 12 is moved rightward due to an earthquake or the like, the first ball joint 44 of the right damping device 30 is pulled down by the steel rod 20, and the first ball joint of the left damping device 30 is moved. The joint 44 is pushed up.
[0043]
Accordingly, the angle formed by the first arm 42 and the second arm 36 on the right side with respect to the first ball joint 44 is enlarged, the interval between the second ball joints 38 is increased, and the first arm 42 on the left side and the second arm 42 are formed. The angle formed by 36 is reduced, and the distance between the second ball joints 38 is reduced. The amount of displacement of the second ball joint 38 is amplified from the amount of displacement of the steel rod 20 in the axial direction due to the triangular nature.
[0044]
For this reason, the vibration energy is efficiently converted into heat and absorbed by the damper 40 arranged in the direction orthogonal to the axial direction of the steel bar 20 (small relative displacement between the foundation concrete 12 and the lower part of the pile 10 × large). Force = large displacement between the second ball joints 38 x small force of the damper 40).
[0045]
Further, the coil spring 41 expands and contracts according to the amplified displacement of the second ball joint 38, and the spring reaction force of the steel bar 20 increases, thereby increasing the restoring force of the pile 10 and the structure.
[0046]
By providing the vibration energy absorbing structure between the pile 10 and the foundation concrete 12 in this manner, it is not necessary to support the structure with a laminated rubber or the like as in the case of the seismic isolation device, so that maintenance becomes easy. In addition, the underground space can be used effectively.
[0047]
Further, by supporting the foundation concrete 12 of the structure with the pin bearings 14, the bending moment of the head of the pile 10 can be made close to zero. For this reason, the deformation of the head becomes large due to an earthquake or the like, but the bending stress acting on the head of the pile 10 and the foundation concrete 12 is greatly reduced.
[0048]
Further, the moment of the intermediate portion of the pile 10 where the mounting ring 16 is installed is also generated in the pile head by the action of the steel rod 20 in a direction opposite to the moment of the intermediate portion of the pile 10, and as a result, the moment of the intermediate portion of the pile is generated. Is also smaller.
[0049]
In this embodiment, the steel rods 20 extend obliquely upward from the pile 10 in two directions. However, the steel rods 20 extend in four directions (each steel rod 20 is spaced 90 degrees in a planar view), and the damping device 30 is extended. May be arranged in four places.
[0050]
Although the coil spring 41 is provided to increase the rigidity of the structure, the vibration energy of the structure can be absorbed only by the damper 40.
[0051]
Next, a method of attaching the steel rod 20 having the vibration energy absorbing structure will be described.
[0052]
As shown in FIG. 5A, the ground into which the pile 10 is driven is excavated to dig down the box-shaped groove 50, and the bentonite V is inserted to prevent collapse of the hole wall of the groove 50. Next, as shown in FIG. 5B, the pile 10 to which the steel bar 20 protected by the flexible pipe 24 is connected is built.
[0053]
Next, as shown in FIG. 5C, a chemical solution is injected into the bentonite V to form a solidified portion V1, thereby stabilizing the ground. Even if the groove 50 is solidified, there is no problem because the steel rod 20 is in the flexible tube 24.
[0054]
Finally, as shown in FIG. 5 (D), after connecting the lower end of the pillar 26 of the structure and the head of the pile 10 with the pin bearing 14, the crushed stone 23 is spread on the ground and rolled. Concrete is cast on the crushed stone 23 to construct the basic concrete 12. The steel rod 20 and the flexible tube 24 are arranged so that the foundation concrete 12 is exposed.
[0055]
Next, a vibration energy absorbing structure according to a second embodiment will be described.
[0056]
As shown in FIGS. 6 to 8, in the second embodiment, a geometrical configuration including the first arm 42, the second arm 36, the first ball joint 44, the second ball joint 38, and the third ball joint 32. The simple displacement amplification structure is the same as that of the first embodiment, but the arrangement method of the dampers 80 and 82 and the coil spring 84 is different.
[0057]
That is, the damper 80 is rotatably connected to the second ball joint 38 and the fourth ball joint 86, respectively. The fourth ball joint 86 is mounted on a mounting plate 91 provided on the beam 28.
[0058]
Further, both ends of the coil spring material 84 are connected to the second ball joint 38, and the damper 82 is rotatably connected to the fifth ball joint 88 and the second ball joint 38 provided on the foundation concrete 12. .
[0059]
The second embodiment having the above-described configuration is equivalent to the first embodiment in terms of absorbing the displacement amplification effect and the vibration energy. However, since the second ball joint 38 is connected to the structure via the damper, damping is achieved. The device 90 is kept in a stable state.
[0060]
Note that the second ball joints 38 may be connected to each other by a damper, and the second ball joint 38 and the structure side may be connected by a coil spring.
[0061]
Next, a vibration energy absorbing structure according to a third embodiment will be described.
[0062]
As shown in FIG. 9, the third embodiment is the same as the vibration energy absorbing structure of the first embodiment except that the foundation concrete 12 is supported by a spherical rolling bearing 92 provided on the head of the pile 10. It is.
[0063]
By supporting the foundation concrete 12 with the rolling bearings 92 in this way, the relative displacement between the pile 10 and the foundation concrete 12 is allowed, and the bending moment of the head of the pile 10 can be made close to zero. For this reason, the vibration energy of the structure can be absorbed, and the bending stress acting on the foundation concrete 12 due to an earthquake or the like can be greatly reduced.
[0064]
Next, a vibration energy absorbing structure according to a fourth embodiment will be described.
[0065]
In the fourth embodiment, as shown in FIG. 10, a toggle damping device 52 is used as a damping device.
[0066]
In the toggle damping device 52, the steel bar 20 and the third arm 58 are connected by the fourth ball joint 60, and the intersection angle is obtuse. The other end of the third arm 58 is connected to a fifth ball joint 66 rotatably mounted on a mounting plate 67 of the beam 28.
[0067]
Further, a rotation bearing 64 is attached to the foundation concrete 12, and one end of a damper 62 is rotatably connected to the rotation bearing 64. The other end of the damper 62 is connected to the fourth ball joint 60.
[0068]
The toggle damping device 52 is disposed symmetrically in a frame constituted by the columns 26 and the beams 28, and the left and right fourth ball joints 60 are connected by a spring member 68. For this reason, the steel bars 20 cross. In order to protect the intersecting steel bars 20, an X-shaped flexible pipe 98 having a branch portion is used.
[0069]
Next, the operation of the vibration energy absorbing structure according to the fourth embodiment will be described.
[0070]
When the pile 10 moves in the horizontal direction due to an earthquake or the like, the foundation concrete 12 relatively displaces horizontally. Therefore, the fourth ball joint 60 is displaced by the steel bar 20. Here, due to the function of the toggle damping device 52, a small displacement between the ball joint 18 and the fifth ball joint 66 causes the fourth ball joint 60 to move greatly and the damper 62 to be greatly deformed.
[0071]
Therefore, a relationship of small deformation × large force = large deformation × small force is established, and the damper 62 connected to the fourth ball joint 60 absorbs the vibration of the structure by the small force. Further, since a small displacement between the foundation concrete 12 and the pile 10 is amplified by a large displacement and absorbed, vibration due to a small or medium-sized earthquake or wind can be effectively absorbed. Further, the left and right fourth ball joints 60 are connected by a spring member 68 to increase the rigidity of the coupled system between the foundation concrete 12 and the pile 10. Thus, the posture of the toggle damping device is normally maintained, and the device does not shake more than necessary. The coupled system means a system in which two vibration systems vibrate while exchanging energy with each other.
[0072]
Here, the amplification function of the toggle attenuation device will be described with reference to the schematic diagram of FIG.
[0073]
For example, if the ball joint 18 of the pile 10 is displaced horizontally by δ1 to the left due to an earthquake or the like, the displacement amount of δ1 is amplified to δ2 because the third arm 58 rotates around the fifth ball joint 66. You. Accordingly, the work of the damper 62 increases, and the vibration energy of the structure is efficiently absorbed.
[0074]
As shown in FIG. 12, the spring member 68 used in the present embodiment is not connected to the compression coil spring 70 directly to the fifth ball joint 60 but is slidably inserted into the casing 72 and the casing 72. Connected to the fifth ball joint 60. A long groove 78 is formed in the casing 72 in the axial direction, and a pin 76 projecting from the rod 74 projects outward from the long groove 78 and is urged by the compression coil spring 70.
[0075]
【The invention's effect】
Since the present invention is configured as described above, it is possible to amplify the relative displacement between the pile and the structure, absorb the vibration, and suppress the vibration of the structure due to an earthquake or a strong wind.
[Brief description of the drawings]
FIG. 1 is a perspective view of a main part showing a vibration energy absorbing structure according to a first embodiment.
FIG. 2 is an elevational sectional view showing a vibration energy absorbing structure according to the first embodiment.
FIG. 3 is an elevational sectional view showing a vibration energy absorbing structure according to the first embodiment.
FIG. 4 is an explanatory view showing a state in which the head of a pile is elastically deformed in a structure in which a foundation is supported by a pin bearing.
FIG. 5 is an explanatory diagram showing a series of operation procedures for attaching a steel rod to a pile.
FIG. 6 is a perspective view of a main part showing a vibration energy absorbing structure according to a second embodiment.
FIG. 7 is an elevational sectional view showing a vibration energy absorbing structure according to a second embodiment.
FIG. 8 is an elevational sectional view showing a vibration energy absorbing structure according to a second embodiment.
FIG. 9 is an elevational sectional view showing a vibration energy absorbing structure according to a third embodiment.
FIG. 10 is a vertical sectional view showing a vibration energy absorbing structure according to a fourth embodiment.
FIG. 11 is a schematic diagram illustrating a toggle mechanism.
FIG. 12 is a perspective view showing a spring member.
FIG. 13 is an elevation view showing a conventional seismic isolation device.
FIG. 14 is an explanatory diagram showing bending stress acting on the head of the pile in a structure in which the foundation and the pile are fixed.
[Explanation of symbols]
10 pile 12 foundation concrete (foundation)
14 pin bearing 20 steel rod (axial force transmitting member)
24 Flexible pipe (tube material)
30 Damping device (damping means)
52 Toggle damping device (damping means)
68 Spring member 92 Rolling bearing

Claims (9)

A pile built underground,
A pin bearing that is provided on the head of the pile and rotatably supports the foundation of the structure;
An axial force transmitting member having a lower end portion rotatably connected below the head of the pile and an upper end portion penetrating the base portion,
Damping means disposed on the base portion, amplifying and attenuating the relative displacement between the base portion and the pile transmitted through the axial force transmitting member,
A vibration energy absorbing structure comprising: 2. The method according to claim 1, further comprising a rigidity increasing unit configured to increase a rigidity of a coupled system between the foundation and the pile according to an amplification factor of a relative displacement between the foundation and the pile of the damping unit. 3. The described vibration energy absorbing structure. The attenuation means,
A first joint member to which an upper end of the axial force transmitting member is rotatably connected;
A pair of first arms that are rotatably connected at one end to the first joint member, and extend obliquely in a direction away from each other with the axial force transmitting member interposed therebetween;
A second joint member connected to the other end of the first arm,
A damper connected to the second joint member to limit relative movement between the second joint members;
A pair of second arms, one end of which is rotatably connected to the second joint member and which extends obliquely in a direction approaching each other with the first arm interposed therebetween;
A third joint member to which the other end of the second arm is connected, and which is rotatably attached to a beam or a pillar on a foundation;
The vibration energy absorbing structure according to claim 1 or 2, wherein the damping device is configured by: 4. The vibration energy absorbing structure according to claim 3, wherein said rigidity increasing means is a spring material for connecting said second join members. The attenuation means,
A fourth joint member to which an upper end of the axial force transmitting member is rotatably connected;
A third arm having one end rotatably connected to the fourth joint member at a predetermined angle with the axial force transmitting member;
A fifth joint member in which the other end of the third arm is rotatably attached to a beam or a pillar on a foundation;
A damper one of which is connected to the fourth joint member and the other is rotatably attached to the base portion or the pillar and restricts movement of the fourth joint member;
The vibration energy absorbing structure according to claim 1, wherein the structure is a toggle damping device. The vibration energy absorber according to claim 5, wherein the toggle damping device is disposed symmetrically in a frame including a beam and a column, and the left and right fourth joint members are connected by a spring member. Construction. The said axial-force transmission member is accommodated in the pipe material provided with the diameter of the magnitude | size which does not contact by the relative displacement of the said base part and the said pile, The Claim 1 characterized by the above-mentioned. Vibration energy absorption structure. A pile built underground,
A rolling bearing provided on the head of the pile and supporting a foundation of the structure;
An axial force transmitting member having a lower end portion rotatably connected below the head of the pile and an upper end portion penetrating the base portion,
Damping means disposed on the base portion, amplifying and attenuating the relative displacement between the base portion and the pile transmitted through the axial force transmitting member,
A vibration energy absorbing structure comprising: 9. The method according to claim 8, further comprising a stiffness increasing unit that increases a rigidity of a coupled system between the foundation and the pile according to an amplification factor of a relative displacement between the foundation and the pile of the damping unit. The described vibration energy absorbing structure.

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