JP5269537B2 - Seismic isolation / reduction mechanism - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a vibration damping mechanism or the like capable of damping a vibration by exhibiting a damping force or resistance force matched to an earthquake, irrespective of a large, middle or small earthquake, and capable of attaining it by simple structure. <P>SOLUTION: A damping material 6 is constituted to make rigidity get high along with an increase of a vibrational displacement to increase a deformation, to damp thereby the vibration by a deformation due to the vibrational displacement of specified level and by execution of an acceleration reducing action, and to conduct an action to damp the vibration by a larger deformation due to a larger vibrational deformation than the vibrational displacement of specified level and by the execution of the acceleration reducing action. <P>COPYRIGHT: (C)2010,JPO&amp;INPIT

Description

  The present invention relates to a vibration damping mechanism and a seismic isolation / reduction mechanism.

In buildings and the like, it has been conventionally practiced to attenuate the shaking of buildings by absorbing vibration energy by friction.
JP 2008-121399 A

  However, in a structure that is attenuated by friction, the damping force or resistance is constant regardless of whether it is a large earthquake or a small and medium earthquake, and the resistance is insufficient during a large earthquake, There is a problem that it is difficult to achieve the desired attenuation performance.

  In view of the above problems, the present invention can attenuate the vibration by exerting a damping force or a resistance force suitable for those earthquakes regardless of whether it is a large earthquake or a small and medium earthquake. It is another object of the present invention to provide a vibration damping mechanism that can be realized with a simple structure.

The above problem is provided with a damping material configured to increase in rigidity as the seismic displacement increases and deformation increases.
As a result, the damping material is deformed by the vibration displacement of a specific size and also performs an acceleration reduction action to attenuate the vibration, and is deformed by a vibration displacement larger than the vibration displacement of the specific size. At the same time, the present invention is solved by a vibration damping mechanism characterized in that it performs an action of reducing acceleration by performing an acceleration reducing action (first invention).

  This seismic damping mechanism is constructed so that its rigidity increases as the deformation of the damping material increases, so that it operates as described above. Regardless of whether it is a small or medium-sized earthquake, it is possible to attenuate the vibration by exhibiting the damping force or resistance force suitable for those earthquakes.

  Moreover, since the damping material is simply configured to increase in rigidity as the vibration displacement increases and deformation increases, it can be realized with a simple structure. it can.

  In the first invention, the damping material may be configured to compress and deform to perform the vibration damping action (second invention). In this case, the damping material is compressed to the limit at the time of a large vibration and functions as a stopper, thereby preventing the displacement due to the vibration from becoming excessive. By the way, when making a structure that performs a vibration damping action by shear deformation, the damping material breaks due to the shear deformation, loses the resistance force, and when it has a structure that performs the vibration damping action by friction, Insufficient resistance will occur.

  In the second invention, the damping material may have a higher rigidity as the deformation increases because the cross-sectional area is different in the direction of compressive deformation. 3 invention).

  In this case, in connection with the fact that the damping material is a compression type, the configuration is such that the rigidity increases as the deformation increases only by making the shape of the damping material as described above. This can be done easily.

  The damping material of the first and second inventions has a structure in which a plurality of damping material layers having different stiffnesses are provided in a laminated state in the direction in which they are compressed and deformed, whereby deformation is increased. It may be configured such that rigidity increases as it goes on.

In addition, the present invention provides a lower structure unit integrated on the ground side, and the upper structure unit is subjected to seismic isolation support or vibration reduction support, and is deformed by the horizontal relative displacement of the upper and lower structure units due to an earthquake, thereby reducing acceleration. In the seismic isolation and seismic isolation mechanism equipped with damping material that performs damping action to reduce the relative displacement of the upper and lower structure parts,
The damping material is configured so that the relative displacement in the horizontal direction of the upper and lower structures due to the earthquake increases, and the rigidity increases as the deformation increases.
As a result, the damping material is deformed by a relative displacement of a specific size, and also performs a damping operation of reducing the relative displacement of the upper and lower structure parts by performing an acceleration reduction function, and the relative displacement of the specific size. A seismic isolation / reduction mechanism characterized by a greater deformation due to a larger relative displacement and a damping action that reduces acceleration and lowers the relative displacement of the upper and lower structure parts. Included (fourth invention).

  This seismic isolation / reduction mechanism is constructed so that its rigidity increases as the deformation of the damping material increases. The relative displacement of the upper and lower structures can be kept small, and effective seismic isolation and seismic reduction can be performed during small and medium earthquakes.

In the fourth invention, either one of the upper structure portion and the lower structure portion is provided with an inner circumferential circular recess with the axial direction oriented in the vertical direction, and the other, the axial direction is also directed in the vertical direction, An outer peripheral circular convex portion protruding into the recess is provided,
The damping material has an annular shape, and is installed in an annular space between the outer peripheral surface portion of the convex portion and the inner peripheral surface portion of the recess. By the relative displacement in the horizontal direction of the upper and lower structure portions during an earthquake, A part of the circumferential direction is compressed and deformed by the outer peripheral surface portion of the convex portion and the inner peripheral surface portion of the recess, and the acceleration is reduced, so that the relative displacement of the upper and lower structure portions is reduced. (5th invention).

  In this case, the relative displacement in any direction in the horizontal two-dimensional direction of the upper and lower structure portions can be reduced by the damping material, and the damping action can be performed. By the combination, it is possible to firmly prevent the upper and lower structure portions from being displaced relative to each other in the horizontal two-dimensional direction when a large earthquake occurs, and in addition, they can be realized with a simple structure.

  Since the vibration damping mechanism and seismic isolation / reduction mechanism of the present invention are as described above, the damping force or resistance suitable for those earthquakes, regardless of whether they are large earthquakes or small and medium earthquakes. The vibration can be attenuated by exerting force, and it can be realized with a simple structure.

  Next, the best mode for carrying out the present invention will be described with reference to the drawings.

  The embodiment shown in FIG.1 and FIG.2 is a thing at the time of applying this invention to the building which employ | adopts a seismic-reduction foundation structure, In FIG. 1 (a), 1 is a ground side concrete foundation as a lower structure part, 2 Is the building-side concrete foundation as the superstructure. In the event of an earthquake, the ground-side concrete foundation 1 and the building-side concrete foundation 2 are displaced relative to each other in the horizontal direction, and the vibration is transmitted to the building-side concrete foundation 2 side. Is suppressed, and the vibration is attenuated by the frictional resistance between the ground-side concrete foundation 1 and the building-side concrete foundation 2.

  As shown in FIGS. 1 (b) and (c), the building-side concrete foundation 2 is provided with an inner circumferential circular through-hole 3 with the axial direction oriented in the vertical direction, and the bottom of the foundation-side concrete foundation 1 is A recess 4 is formed as an upper surface portion, and the upper surface portion of the ground side concrete foundation 1 projects into the recess 4 with the axial direction directed vertically in the central portion of the recess 4. An outer peripheral circular cylindrical convex portion 5 integral with the side concrete foundation 1 is formed, and an annular damping member 6 is formed in an annular space between the circular inner peripheral surface portion of the recess 4 and the circular outer peripheral surface portion of the convex portion 5. Is installed.

  The damping material 6 is made of a viscoelastic body having both elasticity and viscosity, specifically, a low resilience foam and the like, as shown in FIGS. When the concrete foundation 1 and the building-side concrete foundation 2 are relatively displaced in the horizontal direction, a part in the circumferential direction, that is, a region part on the opposite side to the displacement direction, is the inner peripheral surface part of the recess 4 and the convex part 5. The outer peripheral surface portion is compressed and deformed, and the acceleration reduction action is performed, so that the relative displacement between the ground side concrete foundation 1 and the building side concrete foundation 2 is reduced.

  And in this embodiment, the damping material 6 becomes large as the relative displacement of the horizontal direction of the ground side concrete foundation 1 and the building side concrete foundation 2 by an earthquake becomes large, and the amount of compressive deformation becomes large, In order to increase the rigidity, as shown in FIG. 1B, the cross-sectional area increases from the inner peripheral surface side of the recess 4 toward the outer peripheral surface side of the convex portion 5 in the direction of compressive deformation. It is formed as follows.

In the structure of the embodiment shown in FIG. 1A, the dimension a is, for example, 910 mm, the dimension b is, for example, 200 mm, the dimension c is, for example, 300 mm, and the number of the damping members 6 is determined by the weight of the building. It is better to secure a constant of about 40%. For example, about four places are provided with a total floor area of about 120 m ² .

  In the above building, as the damping material 6, a material whose rigidity increases as the deformation increases is used. Therefore, in a small and medium earthquake, the ground-side concrete foundation 1 and the building-side concrete foundation 2 The relative displacement in the horizontal direction is small, so that the damping material 6 is also less deformed and its rigidity is small, so that the damping performance suitable for small and medium earthquakes is exhibited. In a large earthquake, the ground side concrete foundation 1 and the building side Since the relative displacement in the horizontal direction with the concrete foundation 2 is large, the deformation of the damping material 6 is also large and its rigidity is large, so that the damping performance suitable for a large earthquake is exhibited. Therefore, regardless of whether it is a large earthquake or a small-medium earthquake, it is possible to attenuate the vibration by exerting a damping force or resistance suitable for those earthquakes. The relative displacement with the building-side concrete foundation 2 can be kept small, and effective seismic reduction can be performed during small and medium earthquakes.

  Moreover, since the damping member 6 is simply configured to increase in rigidity as the vibration displacement increases and deformation increases, it is realized with a simple structure. Can do.

  Further, in the above-described embodiment, the damping member 6 is configured to perform the vibration damping action by compressing and deforming, and therefore, compared to the case of performing the vibration damping action by shearing deformation, FIG. As shown in (c), the damping member 6 is compressed to the limit during a large vibration and functions as a stopper, thereby preventing the displacement due to the vibration from becoming excessive.

  In particular, in the present embodiment, the relative displacement in any two-dimensional direction between the ground-side concrete foundation 1 and the building-side concrete foundation 2 can be reduced by the damping material 6 and the damping action can be performed. The combination of the convex part 5, the concave part 4 and the damping material 6 makes the ground-side concrete foundation 1 and the building-side concrete foundation 2 larger than a certain level in a horizontal two-dimensional direction even if an unexpected large earthquake is damaged. It is possible to firmly prevent relative displacement, and in addition, they can be realized with a simple structure.

  Further, in the present embodiment, the damping member 6 has a higher rigidity as the deformation increases because the cross-sectional area is different in the direction of compressive deformation in connection with the compression member 6 being a compression type. Therefore, it is possible to easily cope with the configuration in which the rigidity increases as the deformation increases.

  The form of the damping material 6 is not limited to the form as shown in FIG. 1 (b), but is suitable for the purpose as shown in FIGS. Various forms may be used.

  Moreover, the damping material 6 is made of a structure provided in a laminated state in a direction in which the damping material layer composed of a plurality of low resilience foams having different rigidity is compressed and deformed, as extended above. Therefore, it may be configured such that the rigidity increases as the deformation increases.

  Although the embodiment of the present invention has been described above, the present invention is not limited to this, and various modifications can be made without departing from the spirit of the invention. For example, in the above embodiment, the case where the vibration damping mechanism of the present invention is applied to a building adopting a seismic reduction foundation structure is shown, but it can also be applied to a seismic isolation building or applied to a seismic control building. It can also be applied to other buildings and various structures.

The structure of the embodiment is shown. FIG. (A) is a cross-sectional front view showing a foundation side portion of a building including a vibration damping mechanism portion and a vibration reduction mechanism portion, and FIG. FIG. 3C is a plan view of the same. FIGS. 1A to 1C are cross-sectional front views each showing an operating state. FIGS. 1A to 1D are cross-sectional front views showing various forms of the damping material.

Explanation of symbols

1 ... Ground side concrete foundation (lower structure)
2 ... Building side concrete foundation (superstructure)
4 ... recess 5 ... convex part 6 ... damping material

Claims (3)

The upper structure is supported by the base structure integrated on the ground side, and the upper and lower structures are deformed by the relative displacement in the horizontal direction of the upper and lower structures due to the earthquake, and the acceleration is reduced to achieve the upper and lower structures. In the seismic isolation and seismic reduction mechanism equipped with a damping material that reduces the relative displacement of the part,
The damping material is configured so that the relative displacement in the horizontal direction of the upper and lower structures due to the earthquake increases, and the rigidity increases as the deformation increases.
As a result, the damping material is deformed by a relative displacement of a specific size, and also performs a damping operation of reducing the relative displacement of the upper and lower structure parts by performing an acceleration reduction function, and the relative displacement of the specific size. It is designed to perform a damping action that reduces the relative displacement of the upper and lower structure parts by performing a large deformation due to a larger relative displacement and an acceleration reducing action .
Either one of the upper structure portion and the lower structure portion is provided with an inner circular recess with the axial direction directed in the vertical direction, and the other projecting into the recess with the axial direction also directed in the vertical direction. The outer peripheral circular convex portion is provided,
The damping material has an annular shape, and is installed in an annular space between the outer peripheral surface portion of the convex portion and the inner peripheral surface portion of the recess. By the relative displacement in the horizontal direction of the upper and lower structure portions during an earthquake, A part of the circumferential direction is compressed and deformed by the outer peripheral surface portion of the convex portion and the inner peripheral surface portion of the recess, and the acceleration is reduced, so that the relative displacement of the upper and lower structure portions is reduced. seismic isolation · GenShin mechanism, characterized by being made. 2. The seismic isolation / isolation device according to claim 1, wherein the damping material has different cross-sectional areas in the direction of compressive deformation, so that the rigidity increases as the deformation increases. Seismic reduction mechanism. The seismic isolation and seismic reduction mechanism according to claim 1, wherein the damping material is made of a low-rebound elastic foam.

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