JP4851914B2 - Vibration control method and apparatus - Google Patents

Description

  The present invention relates to a vibration control method and apparatus. More specifically, the present invention relates to a seismic control method and apparatus suitable for use as a mechanism for quickly attenuating building vibration due to earthquakes, winds, etc., and maintaining the main structure of the building in a healthy state.

  The building vibrates in the horizontal direction when subjected to external forces such as earthquakes and winds. If the deformation of the building is small and the distortion of the columns, beams and walls that form the main structure of the building is within the elastic range, the building will not be damaged. However, the building is damaged when the horizontal deformation of the building is increased due to an excessive external force load and the distortion of the columnar material, the beam material and the wall material which are the main structural members of the building exceeds the elastic range. Furthermore, when the external force load is so great that the deformation of the building proceeds further, the main structural members are destroyed and the entire building collapses. One way to prevent this is to install a vibration control device (also called a damper) to absorb vibration energy between the layers of the building to create a vibration control structure. Yes. In a seismic control device constituting a seismic control structure, the ability to greatly and efficiently reduce kinetic energy generated in a building by an earthquake or wind is important.

  As a principle of a conventional vibration control device, there are one that consumes kinetic energy between building layers as destruction energy such as steel materials, and one that converts it into heat energy and loses it. Specifically, the energy that consumes the kinetic energy between building layers as steel and other destructive energy is set up by using low yield strength steel such as low yield point steel, lead, and steel bars between the building layers. Decreases the building's vibration by reducing the building's mechanical energy by converting it into energy consumed when it is destroyed. In addition, what dissipates kinetic energy between building layers by converting it into thermal energy, specifically, installs friction dampers, oil dampers, viscoelastic dampers, etc. between building layers, and deforms dampers by interlayer deformation of buildings. Then, a part of the mechanical energy of the building is converted into heat energy by the heat generated by the damper generated at that time, and the vibration of the building is attenuated by reducing the mechanical energy of the building by losing the heat energy.

  As a conventional seismic control device to which the idea of consuming kinetic energy between building layers as breaking energy such as steel is applied, for example, there is a steel plate seismic damper (Patent Document 1). In this steel plate damping damper 101, as shown in FIG. 11, a pair of end steel plate damping dampers 101a are arranged on the same plane, and the side portions are integrated with a rib plate 105 arranged vertically. The steel plate damping damper 101a for the end portion includes a shear deformation panel 102 made of extremely soft steel, an upper main body mounting plate 103 and a lower main body mounting plate 104, which are integrally provided on the upper and lower portions thereof, and ribs. The upper main body mounting plate 103 and the lower main body mounting plate 104 are longer in width than the shear deformation panel 102, and the end portions 103a and 104a protrude from the side portion 102a of the shear deformation panel 102. In the direction, a plurality of bolt holes 103b, 104b are provided in parallel, and one side portion 102a of the shear deformation panel 102 is provided with a rib plug. Over door 105 is provided.

JP 2003-97084 A

  However, since the steel plate damping damper of Patent Document 1 is a mechanism for protecting the building by destroying the damper itself, it can exhibit damping performance against the first shaking, but there are multiple earthquakes and strong winds. When it occurs continuously for a long time or when it occurs for a long time, there is a problem that the vibration control device is destroyed by the first blow and the vibration control performance cannot be continuously exhibited.

  Further, in a vibration control device that converts kinetic energy between building layers into heat energy and disappears, if the device continues to operate for a long time, the temperature of the device rises and the resistance is lost. For example, in the case of a friction damper, the temperature of the contact surface that generates friction increases and the frictional resistance decreases. In the case of a viscous damper, the temperature of a viscous body such as oil that produces a damping force increases, and the viscosity decreases. Therefore, there is a problem in that the seismic performance cannot be continuously exhibited when an earthquake or strong wind continues for a long time.

  As described above, conventional seismic control devices have a problem that stable seismic control performance cannot be continuously exhibited when receiving a load a plurality of times or when receiving a load for a long time. Therefore, in the case of large-scale earthquakes where it is particularly required that the seismic control device demonstrate its performance and prevent damage to the building, large tremors, including aftershocks, may occur continuously, In long-period structures such as this, vibrations may continue for several minutes, and it is difficult to say that conventional vibration control devices function properly to sufficiently attenuate building vibrations.

  Therefore, the present invention provides a vibration control method and apparatus capable of continuously exhibiting stable vibration control performance against a plurality of external force loads generated continuously or an external force load generated over a long period of time. The purpose is to provide.

  In order to achieve this object, the vibration control method according to claim 1 is rotatably supported by a support member fixed to one of the upper and lower beams of the building when the building frame is deformed by receiving an external force load. While rotating the surface of the stopper fixed to the other beam from the disk and separating it from the stopper, the mechanical energy due to external force load is distributed to the rotational energy of the disk to reduce the strain energy contributing to the deformation of the frame, By bringing the disk into contact with the stopper when the deformation of the housing returns, the mechanical energy due to the external force load is consumed and reduced as the energy of the collision between the disk and the stopper.

  According to a second aspect of the present invention, there is provided a vibration control device which is rotatably supported by a stopper fixed to one of upper and lower beams of a building frame and a support member fixed to the other beam and receives an external force load. And a disk that comes out of the stopper after rotating on the surface of the stopper when it is deformed and contacts the stopper when the deformation of the housing is restored.

  Therefore, according to the vibration control method and apparatus according to claim 1 and 2, the disk has a disk and a stopper interlocking with the displacement of the upper and lower beams of the building frame, and the disk is deformed when the frame is deformed by receiving an external force load. Rotate the surface of the stopper so that it can be removed from the stopper, so that the mechanical energy stored in the housing by the action of external force load is distributed to the rotational energy of the disc and contributes to the deformation of the housing. Energy is reduced and deformation of the housing due to the action of an external force load is suppressed. Furthermore, since the disk contacts the stopper when the deformation of the frame returns, the mechanical energy stored inside the frame due to the action of external force load is consumed as the energy of the collision between the disk and the stopper. It decreases, and the mechanical energy becomes zero by repeating the collision between the two.

  According to a third aspect of the present invention, there is provided a vibration control mechanism which is rotatably supported by a stopper fixed to one of upper and lower beams of a building frame and a support member fixed to the other beam and receives an external force load. The vibration control device is composed of a disk that rotates and moves from the stopper surface when it deforms and then comes off the stopper and comes into contact with the stopper when the deformation of the housing returns to its original state. The seismic devices are arranged side by side in the displacement direction of the beams above and below the frame.

  Therefore, according to the vibration control mechanism according to the third aspect, since the plurality of vibration control devices having different stopper lengths are arranged side by side in the displacement direction of the upper and lower beams of the housing, the timing at which the disk is detached from the stopper and The timing at which the disk contacts the stopper shifts between the multiple vibration control devices, and the effect of suppressing deformation of the frame due to the distribution of the mechanical energy stored inside the frame by the action of external force to the rotational energy of the disk, and the disk The reduction effect of the mechanical energy due to the consumption as the energy of the collision between the stopper and the stopper is successively exhibited according to the magnitude of the vibration of the building.

  The length of the stopper refers to the length of the stopper in the direction of rotational movement of the disk in the displacement direction of the upper and lower beams.

  According to the vibration control method and apparatus of the present invention, the mechanical energy stored in the inside of the housing by the action of the external force load is distributed to the rotational energy of the disk, and the strain energy contributing to the deformation of the housing is reduced to reduce the external force load. Since the deformation of the frame due to the action can be suppressed, it is possible to prevent the building from being damaged and damaged when a large load is applied. Improvements can be made. In addition, the mechanical energy stored inside the housing due to the action of external force load can be consumed and reduced as the energy of collision between the disk and the stopper, and the mechanical energy can be reduced to zero by repeating both collisions. It is possible to quickly dampen the vibration of the building, and it is possible to prevent the building from being damaged due to the mechanical energy remaining for a long time and repeating the vibration, thereby improving the safety against the vibration of the building. In addition, since the seismic control device of the present invention can repeatedly exhibit the seismic performance, it can maintain stable seismic performance even when receiving multiple loads or when receiving a load for a long time. The reliability of the vibration control device can be improved.

  Furthermore, according to the vibration control mechanism of the present invention, in addition to the above-described effects, the effect of suppressing deformation of the frame due to the distribution of the mechanical energy stored in the frame by the action of an external force load to the rotational energy of the disk, The effect of reducing the mechanical energy due to the consumption of energy as a collision with the stopper can be exhibited sequentially according to the magnitude of the vibration of the building, ensuring a strong damping performance as a whole damping mechanism. However, by gradually demonstrating the damping performance, it is possible to exert an appropriate damping performance against a small vibration and a large vibration and to exhibit a smoothly changing damping force.

  Hereinafter, the configuration of the present invention will be described in detail based on the best mode shown in the drawings.

  1 to 5 show an example of an embodiment of the vibration control method and apparatus of the present invention. In this seismic control method, the disk 3 rotatably supported by the support member 2 fixed to the upper beam 7 of the frame 6 is fixed to the lower beam 9 when the frame 6 of the building is deformed by receiving an external force load. By rotating and moving the surface of the stopper 5 away from the stopper 5, the mechanical energy due to the external force load is distributed to the rotational energy of the disk 3 to reduce the strain energy contributing to the deformation of the housing 6 and the deformation of the housing 6 is reduced. When returning to the original state, the disk 3 is brought into contact with the stopper 5, so that the mechanical energy due to the external force load is consumed and reduced as energy of collision between the disk 3 and the stopper 5.

  The above-described vibration control method is implemented as a vibration control device of the present invention. The vibration control device 1 of the present embodiment is rotatably supported by a stopper 5 fixed to a lower beam 9 of a building frame 6 and a support member 2 fixed to the upper beam 7 and receives an external force load to receive the frame 6. And a disk 3 that comes off the stopper 5 after rotating on the surface of the stopper 5 when it is deformed and contacts the stopper 5 when the deformation of the housing 6 is restored.

  The vibration control device 1 is attached to a building housing 6 and functions as a device for attenuating vibrations of the building due to earthquakes and winds. The building frame 6 includes an upper beam 7, a column 8, and a lower beam 9. In addition, what is shown as the housing 6 in FIGS. 1 to 7 may be a single layer, that is, a one-story building, or may be a part of a layer, that is, a multi-story building. . In the case of a single-layer building, the upper beam 7 becomes the roof portion of the building, and the lower beam 9 becomes the foundation portion of the building. Further, in the case of an intermediate layer of a multi-layer building, the upper beam 7 is a ceiling part of the layer and becomes an upper floor part, and the lower beam 9 is a floor part of the layer and a ceiling part of the lower layer. FIG. 1 shows a normal state in which an external force load is not applied to the building and the housing 6 is not deformed.

  The vibration control device 1 includes a support member 2, a disk 3, a support shaft 4, and a stopper 5.

  The support member 2 is a columnar member that rotatably supports the disk 3 via the support shaft 4. The support member 2 has a rigidity equal to or higher than that of the upper beam 7. For example, the upper end is firmly fixed to the lower surface of the upper beam 7 by bolting. Further, the support member 2 has a through hole 2 a that is slidably supported by penetrating the support shaft 4 in the vicinity of the end opposite to the side fixed to the upper beam 7. At this time, sufficient slidability is ensured between the support shaft 4 and the through hole 2a so that the support shaft 4 slides smoothly, and the smaller the sliding resistance, the better.

  The disk 3 is fixed to the support member 2 through the support shaft 4 so that the support shaft 4 penetrates and is fixed to the center portion of the disk 3. The support shaft 4 may be integrally formed with the disk 3. The support shaft 4 is adjusted and supported at a position where the upper surface of the stopper 5 can move while rotating around the support shaft 4 as the disk 3 contacts or meshes with the stopper 5.

  As described above, the support member 2 has rigidity and is firmly fixed to the upper beam 7, and the disk 3 is supported by the support member 2, so that the upper beam 7 is displaced in the horizontal direction with respect to the lower beam 9. The disc 3 integrally with the upper beam 7 is displaced in the horizontal direction with respect to the lower beam 9 by the same amount. When the upper beam 7 is displaced in the lateral direction, the length of the column 8 does not change. Strictly speaking, the upper beam 7 slightly sinks from the normal position, but the amount is small. Here, it is expressed as a horizontal displacement.

  The stopper 5 is a block-like member that is firmly fixed to the upper surface of the lower beam 9 by bolting, for example. The length of the stopper 5 is set based on the characteristics of the building and the amplitude of vibration of the housing 6 to be controlled by the vibration control device 1. Specifically, the length of the stopper 5 is set long when the damping force is exerted for large vibrations, and the length of the stopper 5 is set when the damping force is exerted even for small vibrations. Set it short.

  Here, the disk 3 and the stopper 5 are formed of a material that allows the disk 3 to rotate without sliding because the frictional force is exerted between the two when the housing 6 is deformed and relatively displaced. It has a structure. Specifically, for example, both surfaces are covered with a resin having a large friction coefficient, a gear is formed on the peripheral surface of the disk 3, and a linear guide that meshes with the gear on the peripheral surface of the disk 3 is formed on the upper surface of the stopper 5. It is possible. For example, when the disc 3 and the stopper 5 are covered with a resin, a resin having at least a strength that does not cause damage or deterioration when the two come into contact with each other is used. In the case of forming, a steel material or the like having at least a rigidity that does not break when the two mesh with each other is used.

  The operation of the above-described vibration control device 1 will be described below with reference to FIGS.

  As shown in FIG. 2, when the frame 6 receives an external force load such as an earthquake load or a wind load in the direction of the arrow 10, the upper beam 7 starts to move in the direction of the arrow 11 relative to the lower beam 9 (first One aspect). Then, the disk 3 starts to move in the direction of the arrow 11 in conjunction with the horizontal displacement of the upper beam 7 via the support member 2 and the support shaft 4, starts rotating in the direction of the arrow 12, and moves while rolling on the upper surface of the stopper 5. (Second phase).

  Then, as shown in FIG. 3A, when the width of the horizontal displacement of the upper beam 7 exceeds the range of the stopper 5, the disk 3 comes off from the stopper 5 (third phase).

Assuming that the angular velocity of the disk 3 at the time of removal from the stopper 5 is ω ₀ , the disk 3 continues to rotate in the direction of the arrow 12 while maintaining the angular velocity ω ₀ even after it is detached from the stopper 5 (FIG. 3B). Four aspects). That is, the rotational energy of the disk 3 does not change after the time when the disk 3 is removed from the stopper 5. In consideration of the vibration period of the building housing 6, the time for the disk 3 to be removed from the stopper 5 is short, and sufficient slidability between the support shaft 4 and the through hole 2 a of the support member 2 is ensured. If so, the decrease in angular velocity due to rotational resistance while the disk 3 is disengaged from the stopper 5 is negligible and will be ignored here.

  Subsequently, the speed at which the upper beam 7 is displaced in the direction of the arrow 11 gradually decreases, and the deformation of the housing 6 is maximized when the speed becomes zero (fifth phase).

Here, when the horizontal displacement amount at the maximum deformation is x _max , the horizontal rigidity of the housing 6 is k, and the rotational inertia of the disk 3 is I, the mechanical energy E at the maximum deformation is the strain energy due to the deformation of the housing 6 and the disk 3. Is expressed by the sum of the rotational energy and specifically by Equation 1.

Here, assuming that the decay of the housing 6 is zero, that is, the dissipated energy is zero, the input energy E ₀ stored inside the housing 6 by the action of the external force load is the strain energy and kinetic energy of the housing 6 and the disk 3. Is stored as the sum of the rotational energy. In other words, the input energy E ₀ due to the external force load is equal to the mechanical energy E at the maximum deformation. Therefore, the left side of Equation 1 is also input energy E ₀ due to external force load, and the relationship of Equation 2 is established.

As can be seen from the relationship shown in Formula 2, according to the present invention, the input energy E ₀ is also distributed to the rotational energy of the disk 3, so that the housing 6 can be compared with the case where the seismic control device 1 of the present invention is not used. Strain energy can be reduced. That is, according to the present invention, the maximum deformation amount x _max of the housing 6 can be suppressed to be small.

  Simultaneously with the maximum deformation, as shown in FIG. 4A, the direction of displacement of the upper beam 7 changes to the direction of the arrow 11 '. The amount of deformation of the housing 6 gradually decreases until the disc 3 comes into contact with the stopper 5 again after the displacement direction changes to the direction of the arrow 11 ′, while the arrow 11 ′ of the upper beam 7. The speed of the direction increases (sixth phase). That is, the strain energy of the housing 6 is converted into kinetic energy.

Here, as described above, the time from the third phase until the disk 3 comes into contact with the stopper 5 again is short, and the slidability between the support shaft 4 and the through hole 2a of the support member 2 is sufficient. If secured, the decrease in angular velocity due to rotational resistance is negligible, so it is ignored here. Therefore, the disk 3 keeps rotating while maintaining the angular velocity ω ₀ at the time when it is removed from the stopper 5 (ie, the third phase). That is, the rotational energy of the disk 3 does not change after the third phase.

When the upper beam 7 continues to be displaced in the direction of the arrow 11 ′, the disk 3 and the stopper 5 come into contact again as shown in FIG. 4B (seventh phase). Immediately before the disk 3 and the stopper 5 come into contact with each other, the disk 3 is rotated at an angular velocity ω ₀ in the direction of the arrow 12, so that the disk 3 pushes the stopper 5 into the arrow 11 ′ at the moment when the disk 3 and the stopper 5 come into contact with each other. The disk 3 is pushed back in the direction opposite to the arrow 11 'by the reaction force. This reaction force to the disk 3 pushes the upper beam 7 through the support member 2 in the direction opposite to the arrow 11 ′. That is, the rotational force in the direction of the arrow 12 of the disk 3 acts as a braking force (that is, a brake) against the horizontal movement of the upper beam 7 in the direction of the arrow 11 ′.

The disk 3 and the stopper 5 collide without the contact surface slipping. The contact between the disk 3 and the stopper 5 at this time is a completely inelastic collision with a rebound coefficient (also called a restitution coefficient) of zero, and a part of the mechanical energy is dissipated as collision energy at the time of contact, and the sum of the dynamic energy Is not saved. Accordingly, the mechanical energy stored in the housing 6 by the action of the external force load can be reduced by bringing the disk 3 and the stopper 5 into contact with each other. When the input energy E ₀ due to the external force load is large, By repeatedly contacting the stopper 5, the vibration of the housing 6 can be stopped.

Here, the rotational inertia of the disk 3 is I, the radius is r, the total mass of the upper beam 7, the disk 3, the support member 2, and the support shaft 4 is m, and the angular velocity of the disk 3 before contact with the stopper 5 is ω. ₀ , where the horizontal displacement speed of the upper beam 7 is v ₀ , the angular velocity ω _c of the disk 3 after contact with the stopper 5 and the speed v _c of the upper beam 7 are expressed by Equation 3 based on the angular momentum conservation law. And Expression 4.

  The movement of the disk 3 after contact with the stopper 5 (eighth phase) includes the following three i) to iii) depending on the magnitude of the two terms after dividing the right-hand side molecule of Equation 3 by the radius r. The case is considered.

i) When mrv ₀ > −Iω ₀ This is a case where the angular momentum resulting from the motion of the upper beam 7 is larger than the angular momentum of the disk 3. In this case, although the speed is reduced by the collision, the direction of displacement of the upper beam 7 does not change from when the disk 3 and the stopper 5 are in contact. Accordingly, as shown in FIG. 5A, the disk 3 is displaced in conjunction with the displacement of the upper beam 7, and the upper surface of the stopper 5 is reversed from the direction of the arrow 12 ', that is, from the direction of rotation in the seventh phase. Move while rotating.

  And the direction from the second phase to the eighth phase is repeated with the direction of motion opposite to that described above. And the mechanical energy stored in the inside of the housing 6 is gradually decreased by repeating the contact between the disk 3 and the stopper 5.

ii) When mrv ₀ = −Iω ₀ This is a case where the angular momentum resulting from the motion of the upper beam 7 is equal to the angular momentum of the disk 3. In this case, the movement of the upper beam 7 and the disk 3 stops while the disk 3 and the stopper 5 are in contact (seventh phase; FIG. 4B), and the vibration of the housing 6 stops.

iii) When mrv ₀ <−Iω ₀ This is a case where the angular momentum resulting from the motion of the upper beam 7 is smaller than the angular momentum of the disk 3. In this case, as shown in FIG. 5B, the displacement direction of the upper beam 7 is reversed from the direction of displacement in the seventh phase (arrow 11 ′ in FIG. 4B) to the direction of arrow 11, The displacement speed of the upper beam 7 becomes smaller than the speed in the seventh phase. Moreover, the rotational speed of the disk 3 does not change from the seventh phase, but the angular velocity is reduced.

  Then, the fourth to seventh phases described above are repeated, and in some cases i), the movement of the upper beam 7 and the disk 3 stops at the end while gradually decreasing the mechanical energy, and the housing 6 vibration stops.

  Note that the above iii) is a case where the rotational inertia I of the disk 3 becomes excessive. Considering that the rotational inertia I and weight of the disk 3 are more economical, it is more economical to cause the above iii). The specifications are not optimal. Therefore, it is desirable to determine the specifications of the disk 3 so as to be in the state i) or ii).

  According to the vibration damping device 1 of the present invention, as is apparent from the above description, the mechanical energy of the housing 6 can be distributed to the rotational energy of the disk 3, and the strain energy contributing to the deformation of the housing 6 can be reduced. Further, the mechanical energy of the housing 6 is accumulated as the rotational energy of the disk 3, and the accumulated rotational energy of the disk 3 is effectively used as a vibration brake of the housing 6 when the direction of shaking is reversed. The vibration can be attenuated. Furthermore, since energy consumption due to collision is used as the principle of vibration damping, stable vibration control performance can be exhibited repeatedly over a long period of time.

  In addition, although the above-mentioned form is an example of the suitable form of this invention, it is not limited to this, A various deformation | transformation implementation is possible in the range which does not deviate from the summary of this invention. For example, in the present embodiment, one seismic control device 1 is provided in the displacement direction of the upper beam 7 in the housing 6 of the building. However, the present invention is not limited to this. The devices 1 may be provided side by side.

  Further, when a plurality of vibration control devices 1 are provided side by side in the displacement direction of the upper beam 7 in the housing 6, as shown in FIG. You can also Specifically, when three seismic control devices 1 are provided side by side in the displacement direction of the upper beam 7, the length of the stopper 5 of the central seismic control device 1 is longer than the length of the stoppers 5 of the seismic control devices 1 on both sides. To do. With this configuration, when the housing 6 is deformed from the normal state, first, the discs 3 of the vibration control devices 1 on both sides are disengaged from the stoppers 5 to distribute the mechanical energy due to the external force load to the rotational energy of the disc 3. If the deformation continues further, the disk 3 of the central damping device 1 is disengaged from the stopper 5 to distribute the mechanical energy to the rotational energy of the disk 3 and to convert it into strain energy. The amount converted is further reduced. In addition, after the housing 6 is greatly deformed and the discs 3 of all the vibration control devices 1 are detached from the stoppers 5, when the housing 6 comes into contact with the stoppers 5 again to return to the normal state, First, the disk 3 of the central damping device 1 contacts the stopper 5 to attenuate the vibration. If the vibration still does not completely disappear, the disks 3 of the damping device 1 on both sides contact the stopper 5 and vibrate. Is further attenuated. In this way, by providing a plurality of damping devices 1 and adjusting the length of the stopper 5, the damping effect can be exhibited according to the magnitude of the vibration, and the damping effect can be exhibited step by step. By doing so, it is possible to realize a smooth damping effect by preventing a sudden change in the displacement speed while having a strong damping force as a whole.

  In addition, as shown in FIG. 7, two seismic control devices 1 are arranged side by side in the displacement direction of the upper beam 7, and the stopper 5 having the same length is arranged so as to be shifted from the center position of the disk 3 in a normal state. Can demonstrate the effective vibration control effect. At this time, the center 5a may be shifted from the center position of the normal disk 3 so that the two stoppers 5 arranged in the displacement direction of the upper beam 7 are separated (FIG. 7). You may make it arrange | position so that the two stoppers 5 may approach.

  In the present embodiment, the support member 2 that supports the disk 3 is fixed to the lower surface of the upper beam 7 and the stopper 5 is fixed to the upper surface of the lower beam 9. However, the present invention is not limited to this. The stopper 5 may be fixed to the lower surface of 7 and the support member 2 may be fixed to the upper surface of the lower beam 9.

  Furthermore, in this embodiment, the support member 2 is configured by using a single columnar member. However, the present invention is not limited to this, and the support member 2 may be any configuration as long as the disc 3 can be rigidly supported. It may be configured. For example, two columnar members are used, and the upper beam 7 and the two columnar members form a downward triangular ramen structure, and a through hole 2a through which the support shaft 4 passes is provided at the lower apex portion. Thus, the support member 2 may be configured.

  An embodiment of the seismic performance evaluation method and apparatus seismic performance evaluation of the present invention will be described with reference to FIGS.

  In the present embodiment, a single-layer (that is, one-story) building is assumed. Therefore, the upper beam 7 corresponds to the roof and the lower beam 9 corresponds to the foundation of the building. The specifications of the building frame 6 were such that the weight of the upper beam 7 was 10 tons and the natural frequency was 1 Hz. In this embodiment, the building attenuation constant is set to 0%, and the building itself has no attenuation performance.

  And in order to contrast with Example 1 at the time of installing the damping device 1 of this invention, and Example 1, numerical analysis was performed about Comparative Example 1-1 and Comparative Example 1-2. The outline | summary of Example 1 and Comparative Examples 1-1 and 1-2 was as follows.

  In Example 1, the damping device 1 is installed in the housing 6, and the length of the stopper 5 is set so that the damping effect is effectively exhibited with respect to the vibration amplitude assumed in the numerical analysis (FIG. 8 ( A)).

  Comparative Example 1-1 was a case where the vibration control device 1 was not installed (FIG. 8B).

  Moreover, the comparative example 1-2 installed the damping device 1 in the housing 6, and set the length of the stopper 5 longer than the vibration amplitude assumed by numerical analysis (FIG.8 (C)).

  The specification of the vibration control device 1 is that the weight of the disk 3 is 0.1 ton (that is, 1/100 of the weight of the housing) and the radius is 0.1 m. Further, the rolling resistance of the disk 3 with respect to the support member 2 was set to zero. The length of the stopper 5 was 0.01 m in Example 1 and 2.1 m in Example 3. In addition, in order to make it easy to grasp the influence of the weight of the disk 3, the weight of the support member 2 and the support shaft 4 is set to zero.

  Then, the upper beam 7 was pulled 1.0 m in the horizontal direction and then released and freely vibrated, and the time history waveform of the displacement was analyzed, and the result shown in FIG. 9 was obtained.

  In Example 1 (FIG. 9A), the displacement waveform of the upper beam 7 was almost zero in the second period, and it was confirmed that the vibration was quickly attenuated.

  On the other hand, in Comparative Example 1-1 (FIG. 9B), since the building itself does not have a damping performance, the sine waveform with a vibration period of 1 second and a vibration amplitude of 1 m was not attenuated.

  Further, Comparative Example 1-2 (FIG. 9C) has a sine waveform with a vibration period of 1.23 seconds. This is thought to be because, in Comparative Example 1-2, the inertial mass of the disk 3 became a factor of increasing the mass to the housing 6 as compared with Comparative Example 1-1 having only the housing 6 and an additional mass effect appeared. And in the case of the comparative example 1-2, since the stopper 5 is longer than the displacement range of the upper beam 7 and the disk 3, even if the housing 6 vibrates, the disk 3 does not come off from the stopper 5, and the damping effect is demonstrated. The vibrations were not damped because they were not.

  Another embodiment of the seismic damping method and apparatus seismic performance evaluation of the present invention will be described with reference to FIGS.

  In this example, the attenuation performance of the building was 2.0%, and the other conditions were the same as in Example 1.

  Then, Example 2 (FIG. 8A) shows the case where the vibration control device 1 of the present invention is installed, Comparative Example 2-1 (FIG. 8B) shows the case where the vibration control device 1 is not installed, and the stopper 5 When the length was set longer than the vibration amplitude assumed in the numerical analysis, numerical analysis was performed as Comparative Example 2-2 (FIG. 8C).

  In the same manner as in Example 1, the upper beam 7 was pulled in the horizontal direction by 1.0 m and then released to freely vibrate, and the time history waveform of the displacement was analyzed. The result shown in FIG. 10 was obtained.

  In Example 2 (FIG. 10A), the displacement waveform of the upper beam 7 was almost zero in the second period, and it was confirmed that the vibration was quickly attenuated.

  In Comparative Example 2-1 (FIG. 10B), the waveform with a vibration period of 1 second gradually decreased with time. This is due to the damping performance of the building itself. Actually, the vibration energy of the building is lost due to friction at the joints of structural materials inside the building, air resistance, decay attenuation to the ground, etc. It is.

  In Comparative Example 2-2 (FIG. 10C), the waveform with a vibration period of 1.23 seconds gradually decreased with time. Here, in Comparative Example 2-2, since the stopper 5 is longer than the displacement range of the upper beam 7 and the disk 3, even if the housing 6 vibrates, the disk 3 does not come off from the stopper 5 and the damping effect is not exhibited. . Therefore, it was considered that the vibration attenuation was not due to the damping performance of the damping device 1, but due to the damping performance of the building itself. In addition, the comparative example 2-2 has an additional mass effect because the inertial mass of the disk 3 becomes a factor of increasing the mass of the case 6 in the comparative example 2-2 compared to the comparative example 2-1 having only the case 6 in the comparative example 2-2. It was thought that it was because of. And compared with the comparative example 2-1, the damping of the vibration became dull, and this was considered to be because the inertial force of the mass point was increased by the effect of the added mass and the damping force was relatively lowered.

  From the results of Example 1 and Example 2 above, it was confirmed that the vibration control device 1 of the present invention exhibits good vibration control performance. Moreover, in order to exhibit good seismic control performance, it is necessary to dissipate mechanical energy by causing the disk 3 and the stopper 5 to collide. For that purpose, the characteristics of the building and the type of vibration to be controlled It has been confirmed that it is necessary to set the length of the stopper 5 in the displacement direction of the upper beam 7 based on the above.

It is a side view which shows schematic structure of an example of embodiment of the vibration damping apparatus of this invention, and is a figure which shows the state of normal time. It is a figure explaining the state in the moment when the frame of this embodiment received the external force load to the upper beam. It is a figure explaining the state which the upper beam of the frame of this embodiment received and received the external force load. (A) is a figure of the moment when a disk remove | deviates from a stopper. (B) is a figure of the state which a disk remove | deviates from a stopper and rotates. It is a figure explaining the state which the upper beam of the frame of this embodiment received and received the external force load. (A) is a figure of the state where displacement of an upper beam is the maximum. (B) is a figure of the state which the disk contacted the stopper again. It is a figure explaining the state after a disk contacts a stopper again in this embodiment. (A) is a figure in case the angular momentum resulting from the motion of an upper beam is larger than the angular momentum of a disk. (B) is a figure in case the angular momentum resulting from the motion of an upper beam is smaller than the angular momentum of a disk. It is a side view which shows the schematic structure of an example of other embodiment of the damping device of this invention, and is a figure which shows the state of normal time. It is a side view which shows the schematic structure of an example of further another embodiment of the damping device of this invention, and is a figure which shows the state of normal time. It is a figure explaining the analysis object of Example 1 and 2. FIG. (A) is a figure in the case of having the vibration control device of the present invention (Examples 1 and 2). (B) is a figure of the case where it does not have a vibration control device (Comparative Examples 1-1 and 2-1). (C) is a figure when the stopper of a damping device is long (Comparative Examples 1-2 and 2-2). It is a figure which shows the analysis result of Example 1. (A) is a figure of the result of Example 1. FIG. (B) is a figure of the result of the comparative example 1-1. (C) is a figure of the result of Comparative Example 1-2. It is a figure which shows the analysis result of Example 2. (A) is a figure of the result of Example 2. FIG. (B) is a figure of the result of the comparative example 2-1. (C) is a figure of the result of Comparative Example 2-2. It is a perspective view which shows the conventional damping device.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Seismic control device 2 Support member 2a Through-hole 3 Disk 4 Support shaft 5 Stopper 6 Housing 7 Upper beam 8 Column 9 Lower beam

Claims (3)

  When the building's housing is deformed by receiving an external force load, the surface of the stopper fixed to the other beam is rotated by rotating a disk rotatably supported by a support member fixed to one of the upper and lower beams of the housing. The mechanical energy due to the external force load is distributed to the rotational energy of the disk by being separated from the stopper and the strain energy contributing to the deformation of the housing is reduced, and the deformation of the housing is restored to the original state. A vibration control method characterized in that the mechanical energy due to the external force load is consumed as the collision energy between the disk and the stopper to reduce the contact with the stopper.   A stopper fixed to one of the upper and lower beams of the building frame and a support member fixed to the other beam are rotatably supported to rotate the surface of the stopper when the frame is deformed by receiving an external force load. A vibration control device comprising: a disc that comes out of the stopper after moving and contacts the stopper when the deformation of the casing returns to its original state.   A stopper fixed to one of the upper and lower beams of the building frame and a support member fixed to the other beam are rotatably supported to rotate the surface of the stopper when the frame is deformed by receiving an external force load. A seismic control device is configured by a disk that comes out of the stopper after moving and contacts the stopper when the deformation of the housing returns to its original state, and a plurality of the seismic control devices having different lengths of the stopper are the housing. A seismic control mechanism that is arranged side by side in the displacement direction of the upper and lower beams.

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