JP4893061B2 - Viscous vibration damping device and base-isolated building equipped with the same - Google Patents

Description

  The present invention relates to a viscous vibration damping device that effectively attenuates minute vibrations caused by wind or the like of a superstructure that has been seismically isolated by a seismic isolation device, and to obtain a damping effect in a strong wind, and the viscosity thereof. The present invention relates to a base-isolated building with a vibration control function such as an office building, an apartment house or a detached house equipped with a system vibration damping device.

JP 2004-60828 A JP 2004-100308 A

  A base-isolated building for earthquakes is supported (supported) on a foundation by a base-isolating device that performs base isolation against vibration caused by the earthquake and attenuates the vibration. In such seismic isolation buildings, it is normal that small displacement traffic vibrations and wind-induced vibrations are not considered in addition to earthquakes. For example, an earthquake exceeding a predetermined horizontal load (horizontal force) is caused by a locking mechanism. In general, the seismic isolation device is deactivated until it acts, and when a larger vibration load is generated, the lock mechanism is released and the seismic isolation device is activated.

  By the way, high-rise buildings built in cities are required to improve the comfortability by attenuating small displacement traffic vibrations and wind fluctuations in addition to earthquakes. Many of the vibration damping devices used in such seismic isolation devices are elasto-plastic dampers or friction dampers, even if small displacement traffic vibrations and wind-induced vibrations are attenuated by the damping function of the seismic isolation devices. Because of their low characteristics, the vibration energy absorption efficiency at small displacements is low, so that it is difficult to effectively attenuate traffic vibration and vibration due to wind early.

  On the other hand, instead of an elastoplastic damper or a friction damper, a vibration damping device using a viscous damper that has high vibration energy absorption efficiency at a small displacement and can cope with vibrations from wind and traffic vibrations to large earthquakes has been proposed. In order to cover vibrations from wind and traffic vibrations to large earthquakes, the stroke of the viscous damper must be lengthened, and the vibration damping device becomes long accordingly. There is a problem to intervene.

  In view of the above problems, Patent Document 1 discloses an earthquake or wind that does not exceed a predetermined horizontal displacement with a viscous vibration damping device including a release mechanism including a viscoelastic body, a trigger pin, or a friction joining member. There has been proposed a base-isolated building with a damping function that attenuates small vibrations of superstructures caused by traffic vibrations, etc., and Patent Document 2 discloses a viscosity equipped with a release mechanism using viscous resistance force. There have been proposed seismic isolation buildings with a damping function that damp small vibrations of superstructures caused by earthquakes, winds, traffic vibrations, etc. that do not exceed a predetermined horizontal displacement with a damper. Any seismic isolation building with a vibration function is preferable because it can solve the above-mentioned problems, but it can be released for a long time as long as it is released using horizontal cutting and no such cutting occurs. To obtain stable and stable vibration damping of viscous systems On the can, it has not yet been proposed which can solve the above problems as with seismic isolation building with the proposed damping function in Patent Documents 1 and 2.

  The present invention has been made in view of the above-mentioned points. The object of the present invention is to be able to effectively attenuate even a minute vibration caused by wind or the like and obtain a damping effect in a strong wind. Another object of the present invention is to provide a viscous vibration damping device capable of maintaining such effects over a long period of time as long as a large earthquake does not occur, and a seismic isolation building equipped with this viscous vibration damping device.

  A viscous vibration damping device according to the present invention is connected to an upper mounting portion and a lower mounting portion, and an upper mounting portion and a lower mounting portion for mounting to an upper structure and a lower structure, respectively, which are relatively vibrated in the horizontal direction. A viscous damper that attenuates horizontal vibration of the upper mounting portion relative to the lower mounting portion, and when a certain level of horizontal force is generated in the upper mounting portion relative to the lower mounting portion, of the upper mounting portion and the lower mounting portion for the viscous damper A release mechanism that releases the connection of at least one of the upper attachment portion and the lower attachment portion, and the viscous damper is connected in the horizontal direction to the lower attachment portion. When a horizontal force exceeding a certain level is generated in the upper mounting part, the upper mounting part is disconnected and the connection between one of the upper mounting part and the lower mounting part and the viscous damper in the horizontal direction is released. And uncoupling pin having a weak portion, and a bending stress blocking means to prevent the occurrence of bending stresses in the fragile portion of the connection release pin.

  According to the vibration damping device of the present invention, the viscous damper is connected to the upper mounting portion and the lower mounting portion so as to attenuate the horizontal vibration of the upper mounting portion relative to the lower mounting portion, and the lower mounting portion. In contrast, when a horizontal force of a certain level or more is generated in the upper mounting portion, the release mechanism is configured to release the connection of at least one of the upper mounting portion and the lower mounting portion with respect to the viscous damper. The base mounting part and the base mounting part are respectively attached to the base isolation building in which the base structure is supported on the base structure via the base isolation device that performs base isolation against the vibration in the direction and attenuates the vibration. Using such a vibration damping device attached to each of the upper structure and the lower structure that are relatively vibrated in the horizontal direction can effectively reduce micro vibrations caused by wind etc. even with viscous dampers. It can be attenuated at an early stage to obtain a vibration control effect in strong winds, and only a seismic isolation device is activated for vibration attenuation to the superstructure for large vibrations caused by earthquakes that generate horizontal force above a certain level. As a result, it is not necessary to lengthen the stroke of the viscous damper so that it can be operated even with a large vibration caused by a horizontal force exceeding a certain level. As a result, a small viscous damper can be used. In addition, since the release mechanism includes a bending stress prevention means for preventing the generation of bending stress at the weak portion of the connection release pin, it is possible to avoid mechanical fatigue of the weak portion of the connection release pin due to the generation of bending stress. It is possible to eliminate unintentional breakage of the fragile portion of the release pin due to such mechanical fatigue, and cutting due to horizontal force above a certain level, specifically shearing is connected. Insofar as they do not occur in weak portions of the removal pin can have a viscous dampers can attenuate effectively early also minute vibrations due to wind or the like to obtain the damping effect of the strong wind.

  In the present invention, the connection release pin is interposed between one main body fixed to one of the upper mounting portion and the lower mounting portion, the other main body fixed to the viscous damper, and one and the other main body. Further, a constricted portion as a weak portion may be provided. The connection release pin is usually formed by integrally forming both the main body and the fragile portion. However, the fragile portion may be formed of a material having a mechanical strength lower than that of the two main bodies and may be used as the fragile portion. A material having low strength may be used for the constricted portion.

  In a preferred example, the bending stress preventing means is interposed between one of the upper mounting portion and the lower mounting portion and the viscous damper, and one of the upper mounting portion and the lower mounting portion and the viscous damper. An interposition member that is movable in the horizontal direction with respect to at least one is provided, and the interposition member is horizontally disposed at one end of one of the upper mounting portion and the lower mounting portion and one of the viscous dampers. Or one of the upper mounting portion and the lower mounting portion and the other of the viscous damper movably contact with each other in the horizontal direction, or the upper mounting portion and the lower mounting portion. It is preferable that one end and the viscous damper are in contact with one end and the other end so as to be movable in the horizontal direction, and a plurality, preferably at least three support columns arranged around the connection release pin. Or It may be made to.

  The viscous damper according to the present invention is preferably disposed in a container, a fixed plate disposed in the container and fixed to the container, a gap with respect to the fixed plate, and a horizontal direction with respect to the fixed plate. The movable plate is movably disposed, and the viscous plate is disposed in the gap between the fixed plate and the movable plate and is accommodated in the container.

  The seismic isolation building according to the present invention, in which the upper structure is supported on the lower structure via the seismic isolation device that is isolated from the horizontal vibration caused by the earthquake and attenuates the vibration, is relatively The upper mounting part and the lower mounting part attached to each of the upper structure and the lower structure to be vibrated, and the upper mounting part and the lower mounting part are connected to the lower mounting part to attenuate the horizontal vibration of the upper mounting part. The upper and lower mounting parts for the viscous damper when a horizontal force of a certain level or more is generated in the upper mounting part relative to the lower mounting part due to the relative vibration in the horizontal direction of the upper structure and the lower structure. A viscous vibration damping device including a release mechanism for releasing the connection of at least one of the upper attachment portion and the lower attachment portion. The damper is connected with respect to the horizontal direction, and the upper part is cut when a certain level of horizontal force is generated in the upper part with respect to the lower part due to relative vibration in the horizontal direction of the upper structure and the lower structure. A connection release pin having a fragile portion for releasing the connection between one of the attachment portion and the lower attachment portion and the viscous damper in the horizontal direction, and a bending stress for preventing generation of bending stress at the fragile portion of the connection release pin Blocking means.

  In the seismic isolation building of the present invention, the seismic isolation device may be composed of a laminated rubber in which a rigid layer made of steel plate or the like and an elastic layer made of high damping rubber or the like that effectively attenuates vibration are alternately laminated. Further, it may be provided with a laminated rubber in which a rigid layer and an elastic layer are alternately laminated, and a lead strut embedded in the laminated rubber and effectively dampening vibrations, and further, sliding friction may be provided. Even if it is used, it may be a combination of the above as appropriate. In short, it is isolated from the horizontal vibration caused by the earthquake (exemplifies the isolator function) and attenuates the vibration. Any material may be used as long as it exhibits a damping function.

  The superstructure is preferably an office building, an apartment house, or a detached house, but is particularly preferably a high-rise office building or an apartment house, but the present invention is not limited thereto, and other superstructures. It may be a thing.

  According to the present invention, even minute vibrations caused by wind and the like can be effectively attenuated early, and a vibration control effect in a strong wind can be obtained, and such characteristics can be maintained over a long period unless a large earthquake occurs. It is possible to provide a viscous vibration damping device and a seismic isolation building equipped with the viscous vibration damping device.

  Next, the present invention and its embodiments will be described in more detail with reference to the drawings. The present invention is not limited to these embodiments.

  1 to 4, the seismic isolation building 1 of this example includes a base 2 made of concrete and fixed to a ground with piles, etc., a seismic isolation device 5 including an isolator 4 with lead columns 3, An office building 6 as an upper structure supported on the foundation 2 via the seismic device 5, and a viscous vibration damping device 7 disposed between the foundation 2 and the office building 6. Yes.

  The seismic isolation device 5 interposed between the foundation 2 as the substructure and the office building 6 and supporting the load in the vertical direction (vertical direction) V of the office building 6 is provided in the horizontal direction H due to the earthquake. It is fixed to the isolator 4 that performs seismic isolation against vibration, the lead strut 3 as an elastoplastic material embedded in the isolator 4 while damping the vibration in the horizontal direction H, and the upper and lower surfaces of the isolator 4. And upper and lower mounting steel plates 8 and 9 fixed to the office building 6 and the foundation 2 via anchor bolts or the like, and the isolator 4 includes a plurality of rigid layers 10 made of steel plates and rubber. A plurality of elastic layers 11 made of rubber or the like are made of laminated rubber that is alternately laminated in the vertical direction V, and performs such a seismic isolation operation against the vibration in the horizontal direction H caused by an earthquake and attenuates the vibration. Is to receive a load of office building 6 are arranged a plurality are suitably distributed on the base 2.

  A vibration attenuating device 7 for attenuating the vibration in the horizontal direction H of the high-rise office building 6 that is supported by the seismic isolation with respect to the vibration in the horizontal direction H with respect to the foundation 2 via the seismic isolation device 5 is The bottom wall plate 26 and the mounting plate 66 as the upper mounting portion of the container 25 as the lower mounting portion mounted on the foundation 2 and the office building 6 to be vibrated are connected to the bottom wall plate 26 and the mounting plate 66, respectively. The viscous damper 21 that attenuates the vibration in the horizontal direction H of the mounting plate 66 with respect to the bottom wall plate 26 and the mounting plate with respect to the bottom wall plate 26 due to relative vibration in the horizontal direction H of the office building 6 and the foundation 2 When a horizontal force of a certain level or more is generated in 66, at least one of the attachment plate 66 and the bottom wall plate 26 with respect to the viscous damper 21, in this example, a release mechanism 22 for releasing the connection of the attachment plate 66 is provided.

  The viscous damper 21 is a container 25 fixedly connected to the foundation 2 with an anchor bolt or the like via the bottom wall plate 26 as the lower mounting portion, and the bottom wall plate 26 of the container 25 disposed in the container 25. A plurality of annular fixing plates 28 fixed to each outer peripheral edge portion via attachment mechanisms 27 and arranged with gaps in the vertical direction V, and arranged in the container 25 in the vertical direction V. A plurality of annular movable plates 29 which are arranged in the gaps between the fixed plates 28 with a gap with respect to the fixed plate 28 and are movably arranged in the horizontal direction H with respect to the fixed plate 28; The viscous body 30 disposed in the gap between the fixed plate 28 and the movable plate 29 and accommodated in the container 25, and the inner peripheral edge of each movable plate 29 are fixed to the flange portion 32 via the attachment mechanism 31. To support the movable plate 29 A cylindrical body 33 with 32, and a connecting member 36 having a cylindrical portion 34 that is movably inserted in the cylindrical body 33 in the up-and-down direction V, and an attachment flange portion 35 that is integrally formed with the cylindrical portion 34; The attachment base 35 of the connecting member 36 is fixed to the lower surface 38 by a plurality of bolts 37, and a plurality of bolts 41 are provided at four corners of the upper surface 40 of the upper base 39. And four fixed pedestals 42.

  The container 25 has a rectangular bottom wall plate 26 fixed to the base 2 with anchor bolts, a cylindrical side wall plate 45 welded to the bottom wall plate 26 via bolts and the like, and a welded to the side wall plate 45. And the like, and an annular lid plate 48 having a circular opening 47 at the center, which is secured to the flange plate 46 through welding, bolts, etc. and through which the connecting member 36 passes. And a plurality of reinforcing members 49 fixed to the bottom wall plate 26, the side wall plate 45, and the flange plate 46 through welding or the like.

  The bottom wall plate 26 also functions as a lower mounting portion for mounting the vibration attenuating device 7 to the foundation 2 as a lower structure. As such a lower mounting portion, instead of the bottom wall plate 26, It may be a lower mounting plate that is fixed to the bottom wall plate 26 by welding, bolts, or the like and is also fixed to the foundation 2 by anchor bolts or the like.

  The attachment mechanism 27 includes an upper and lower annular plate 51, an annular spacer plate 52 disposed between the outer peripheral edges of each fixed plate 28, and the upper and lower annular plates 51 and the annular spacer together with the outer peripheral edge of each fixed plate 28. A plurality of bolts 53 for fixing the plate 52 to the bottom wall plate 26, and the attachment mechanism 31 includes an annular plate 54 and an annular spacer plate disposed between the inner peripheral edges of the movable plates 29. 55 and a plurality of bolts 56 for fixing the annular plate 54 and the annular spacer plate 55 to the flange 32 together with the inner peripheral edge of each movable plate 29.

  The lower surface 57 of the cylindrical body 33 is movably in contact with the upper surface 58 of the bottom wall plate 26 in the horizontal direction H, and a space 61 is held between the bottom surface 59 of the cylindrical portion 34 and the inner bottom surface 60 of the cylindrical body 33. On both surfaces of the movable plate 29, a spacer (not shown) that holds the gap between the fixed plate 28 and the movable plate 29 and is slidably in contact with the fixed plate 28 is fixed. Such a spacer may be provided on the fixed plate 28.

  Each of the four pedestals 42 has a receiving surface 62 made of a flat sliding surface parallel to the horizontal direction H on the upper surface thereof.

  When the movable plate 29 moves in the horizontal direction H with respect to the fixed plate 28, the viscous damper 21 is movable by causing viscous shear deformation in the viscous body 30 disposed in the gap between the fixed plate 28 and the movable plate 29. A resistance force due to viscous shear deformation is exerted on the movement of the plate 29 in the horizontal direction H to cause the vibration of the movable plate 29 in the horizontal direction H, and in the horizontal direction of the office building 6 via the mounting plate 66. Vibration is damped.

  The mounting plate 66 is fixed to the lower surface 65 of the office building 6 with bolts or the like.

  The release mechanism 22 connects one of the mounting plate 66 as the upper mounting portion and the bottom wall plate 26 as the lower mounting portion, in this example, the mounting plate 66 and the viscous damper 21 with respect to the horizontal direction H and office work. When a certain level of horizontal force is generated on the mounting plate 66 with respect to the bottom wall plate 26 due to relative vibration in the horizontal direction H of the building 6 and the foundation 2, the mounting plate is sheared in the horizontal direction H in this example. The connection releasing pin 68 having a constricted portion 67 as a weak portion for releasing the connection between the 66 and the viscous damper 21 in the horizontal direction H, and the vicinity of the connecting member 36 to the constricted portion 67 of the connection releasing pin 68 are centered. The bending stress preventing means 70 for preventing the generation of bending stress at the constricted portion 67 due to the addition of the bending moment in the R direction, and one main body 71 of the connection release pin 68 are attached to the mounting plate 66 and the bottom wall plate 26. on the other hand In this embodiment the fixing means 72 for fixing to the mounting plate 66, and the other body 73 of the connecting release pin 68; and a fixing means 74 for fixing the base 39 on the viscous damper 21.

  The connection release pin 68 is fixed to the mounting plate 66 through a fixing means 72 and has a cylindrical main body 71 having a screw hole 75 at one end surface, and an upper base of the viscous damper 21 through a fixing means 74. And a cylindrical main body 73 having a screw hole 76 on one end face, and a constricted portion 67 as a fragile portion interposed between the two main bodies 71 and 73. .

  The fixing means 72 is fixed to the lower surface 82 of the mounting plate 66 by a plurality of bolts 81, and has a holding member 84 having a recess 83 into which the main body 71 is closely fitted, and a central portion of the holding member 84. The fixing means 74 is fixed to the upper surface 40 of the upper base 39 by a plurality of bolts 86. And a holding member 89 having a recess 88 into which the main body 73 is closely fitted, and a bolt 90 that passes through the central portion of the holding member 89 and is screwed into the screw hole 76 of the main body 73. The lower surface of the holding member 84 and the upper surface of the holding member 89 face each other with a gap 91, and a constricted portion 67 is disposed at the position of the gap 91.

  The bending stress blocking means 70 is interposed between the mounting plate 66 and the viscous damper 21 in one of the mounting plate 66 and the bottom wall plate 26, and in this example, the bending stress blocking means 70. In this example, in this example, four bolts 95 (only two are shown) serving as intervening members that are movable in the horizontal direction H with respect to the viscous damper 21 and corresponding to the cradle 42 to hold each bolt 95. Then, four holding members 98 each having a screw hole 97 and being fixed to each of the four corners of the lower surface 82 of the mounting plate 66 by a plurality of bolts 96 are provided.

  Each of the plurality of support bolts 95 arranged around the connection release pin 68 is screwed into the screw hole 97 of the corresponding holding member 98 and can be moved in the horizontal direction H by its enormous head. It contacts the receiving surface 62 of the corresponding receiving base 42. The amount of screwing of the corresponding holding member 98 of each bolt 95 into the screw hole 97 is fixed by a lock nut 99 screwed to the bolt 95. The amount of such screwing, in other words, the amount of protrusion of each bolt 95 from the corresponding holding member 98 can be adjusted by loosening the lock nut 99.

  In the seismic isolation building 1 with the above-described vibration damping function, the cylindrical portion 34 is normally disposed in the substantially central portion of the container 25 in the horizontal direction H, and each of the bolts 95 is enormous as shown in FIGS. The head is in contact with the substantially central portion of the receiving surface 62 of the corresponding receiving base 42 in the horizontal direction H. In this state, a strong wind is generated and the office building 6 is vibrated in the horizontal direction H with respect to the foundation 2 due to the shear deformation of the elastic layer 11 of the seismic isolation device 5. When the magnitude of the horizontal force that is less than the amplitude and causes the vibration is equal to or less than a certain level, the vibration in the horizontal direction H of the office building 6 is not sheared, and the upper base 39 is not sheared. As a result, the movable plate 29 also moves in the horizontal direction H of the office building 6 as shown in FIG. 5 in addition to the elastic-plastic deformation in the horizontal direction H of the lead strut 3 embedded in the isolator 4. When the movable plate 29 is moved in the horizontal direction H, the viscous body 30 in the gap between the movable plate 29 and the fixed plate 28 is subjected to viscous shear deformation by the movement of the movable plate 29 in the horizontal direction H. In addition to the resistance caused by the elastic-plastic deformation of H Resistance caused by the viscosity shear deformation in par 21 attenuates vibration in the horizontal direction H of the movable plate 29, thereby damping vibrations in the horizontal direction H of the office building 6. When the strong wind is settled, the base isolation building 1 is returned to the state shown in FIGS. 1 and 2 by the function of returning to the origin by the elastic layer 11 of the base isolation device 5.

  When an earthquake occurs and the office building 6 is vibrated in the horizontal direction H with respect to the foundation 2 due to the shear deformation of the elastic layer 11 of the seismic isolation device 5, the magnitude of the horizontal force that causes the vibration is constant. The following cases are the same as above, and the horizontal direction of the office building 6 is determined by the resistance force resulting from the elastic-plastic deformation in the horizontal direction H of the lead strut 3 and the resistance force resulting from the viscous shear deformation in the viscous damper 21. The vibration of H is damped.

  On the other hand, when an earthquake occurs and the office building 6 is vibrated in the horizontal direction H with respect to the foundation 2 due to the shear deformation of the elastic layer 11 of the seismic isolation device 5, the magnitude of the horizontal force that causes the vibration is generated. In other words, when the acceleration of the earthquake is large, as shown in FIG. 6, the constricted portion 67 is sheared in the horizontal direction H and the mounting plate 66 and the viscous damper 21 are horizontally aligned. The connection in the direction H, in other words, the connection in the horizontal direction H between the office building 6 and the viscous damper 21 is released, and the vibration in the horizontal direction H of the office building 6 to the foundation 2 is transmitted to the upper base 39. As a result, the movable plate 29 is stopped at that position and does not perform the damping operation. On the other hand, the lead strut 3 is sufficiently deformed by the movement of the office building 6 in the horizontal direction H, and is based on a large horizontal force. Shift of office building 6 in horizontal direction H There will be attenuated preferably early with a elastoplastic deformation of lead column 3.

  After the constricted portion 67 is sheared, the upper base 39 falls by the amount of the space 61, so that each receiving surface 62 of the receiving base 42 is separated from the enormous head of the corresponding bolt 95.

  By the way, according to the seismic isolation building 1, when the magnitude of the horizontal force caused by the strong wind or earthquake applied to the office building 6 is below a certain level, the enormous amount of bolts 95 arranged around the connection release pin 68. Since the head is in contact with the receiving surface 62 of the corresponding pedestal 42 so as to be movable in the horizontal direction H, the bending moment in the R direction centering on the vicinity of the connecting member 36 is caused by such strong wind or earthquake. Even if it occurs in the mounting plate 66 via the office building 6, the addition of the bending moment in the R direction to the constricted portion 67 is prevented, and thus the bending at the constricted portion 67 due to the bending moment in the R direction is prevented. Generation of stress is prevented, mechanical fatigue due to such stress generation can be avoided, and unintended breakage of the constricted portion 67 due to mechanical fatigue can be eliminated.

  That is, according to the seismic isolation building 1 which is supported by the base building 2 via the seismic isolation device 5 which operates to isolate the vibration in the horizontal direction H due to the earthquake and attenuates the vibration. The viscous damper 21 is connected to the office building 6 and the foundation 2 with respect to the horizontal direction H so as to attenuate the vibration of the office building 6 in the horizontal direction H. When the horizontal force is generated, the release mechanism 22 releases the connection of the viscous damper 21 to the office building 6 by shearing of the constricted portion 67, so that the viscous damper 21 in addition to the seismic isolation device 5 is used. However, it is possible to effectively attenuate micro-vibration due to wind etc. early and to obtain a vibration control effect during strong winds. Damping against vibration In this regard, since only the seismic isolation device 5 is operated, there is no need to lengthen the stroke of the viscous damper 21 so that it can be operated even with a large vibration caused by a horizontal force exceeding a certain level. As a result, a small viscous damper 21 can be used, and the shear release mechanism 22 allows a horizontal force to be applied to the constricted portion 67 of the connection release pin 68 and allows shearing at the constricted portion 67, while Since the bending stress preventing means 70 for preventing the bending stress at the constricted portion 67 due to the addition of the bending moment in the R direction to the constricted portion 67 of the release pin 68 is provided, the bending moment in the R direction is provided. It is possible to avoid mechanical fatigue of the constricted portion 67 of the connection releasing pin 68 due to the above-mentioned, and to eliminate unintentional breakage of the constricted portion 67 of the connection releasing pin 68 due to such mechanical fatigue. As long as shear in the horizontal direction H caused by a horizontal force exceeding a certain level does not occur in the constricted portion 67 of the connection release pin 68, minute vibrations caused by wind and the like can be effectively and quickly damped by the viscous damper 21. A vibration control effect during strong winds can be obtained.

  As the seismic isolation device, a friction type seismic isolation device using friction may be used instead of using the lead strut 3, and a horizontal force of a certain level or more relative to the office building 6 relative to the foundation 2. In the horizontal direction H between the viscous damper 21 and the base wall 2 via the bottom wall plate 26 instead of releasing the horizontal connection between the viscous damper 21 and the office building 6 via the mounting plate 66. May be canceled. Further, the space 61 may not be provided so that the upper base 39 does not fall after the constricted portion 67 is sheared. Further, an elastic body is disposed in the space 61 so that the constricted portion 67 of the connection release pin 68 is not provided. The tensile force in the vertical direction based on the load of the upper base 39 or the like may be prevented from being applied as much as possible. When the upper base 39 is not dropped after the shearing, the receiving surface 62 and the bolt 95 are also retained after the shearing. The width of the receiving surface 62 is sufficiently large so as to ensure contact with the surface, and a lubricant such as grease is interposed on the contact surface between the receiving surface 62 and the bolt 95 as necessary, or for example, the receiving surface 62 At least one of a low friction member may be applied between the bolt 95 and the bolt 95, but an unnecessary horizontal H shearing force is not applied to the constricted portion 67 before shearing. For this purpose, the receiving surface 62 and the bolt 95 may be roughened so that the contact surfaces a slight frictional resistance occurring between.

  In addition, by replacing the connection release pin 68 sheared by the constricted portion 67 with a new connection release pin 68 not sheared by the constricted portion 67, it can be used again as the release mechanism 22 in the seismic isolation building 1.

FIG. 3 is a cross-sectional explanatory view of the vibration damping device of the example shown in FIG. 2. It is front explanatory drawing of the preferable example of the embodiment of this invention. FIG. 3 is a cross-sectional view taken along line III-III of the vibration damping device shown in FIG. 1. It is a perspective view of the connection release pin of the example shown in FIG. It is operation | movement explanatory drawing of the example shown in FIG. It is operation | movement explanatory drawing of the example shown in FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Seismic isolation building 2 Foundation 3 Lead support 4 Isolator 5 Seismic isolation device 6 Superstructure 7 Vibration damping device

Claims (2)

An upper mounting portion and a lower mounting portion for mounting on the upper structure and the lower structure that are relatively vibrated in the horizontal direction, and a horizontal direction of the upper mounting portion with respect to the lower mounting portion connected to the upper mounting portion and the lower mounting portion. And a release mechanism for releasing the connection of at least one of the upper mounting portion and the lower mounting portion with respect to the viscous damper when a certain horizontal force is generated in the upper mounting portion with respect to the lower mounting portion. The release mechanism connects one of the upper mounting portion and the lower mounting portion and the viscous damper with respect to the horizontal direction, and a certain horizontal force is applied to the upper mounting portion with respect to the lower mounting portion. A connection release pin having a weakened portion that is cut when it occurs to release the connection between one of the upper attachment portion and the lower attachment portion and the viscous damper in the horizontal direction; Has and a bending stress blocking means to prevent the occurrence of bending stresses in the fragile portion of the release pin, bending stress blocking means, there between one and the viscous damper of the upper mounting portion and the lower mounting portion A plurality of bolts arranged around the connection release pin and having an expansion head, and fixed to one of the upper mounting portion and the lower mounting portion and the viscous damper. The holding member to which each bolt is screwed, fixed to one of the upper mounting portion and the lower mounting portion and the other of the viscous damper, and horizontally movable to the expansion head of each bolt A viscous vibration damping device comprising: a cradle having a receiving surface that comes into contact; and a lock nut that adjusts a protruding amount of each bolt from a holding member . A seismically isolated building that supports the upper structure on the lower structure via a seismic isolation device that operates in isolation from the horizontal vibration caused by the earthquake and attenuates the vibration. The upper mounting portion and the lower mounting portion attached to the upper structure and the lower structure, respectively, and the upper mounting portion and the lower mounting portion are connected to attenuate the horizontal vibration of the upper mounting portion with respect to the lower mounting portion. If a certain level of horizontal force is generated in the upper mounting part relative to the lower mounting part due to the relative vibration in the horizontal direction of the viscous damper and the upper and lower structures, the upper mounting part and the lower mounting part against the viscous damper A viscous vibration damping device having a release mechanism for releasing at least one of the couplings, and the release mechanism is connected to one of the upper mounting portion and the lower mounting portion and the viscous damper. Are connected to each other in the horizontal direction and the upper part is cut when a certain level of horizontal force is generated in the upper part relative to the lower part due to relative vibration in the horizontal direction of the upper structure and the lower structure. A connection release pin having a fragile portion for releasing the connection between one of the attachment portion and the lower attachment portion and the viscous damper in the horizontal direction, and a bending stress for preventing generation of bending stress at the fragile portion of the connection release pin The bending stress blocking means is disposed between one of the upper mounting portion and the lower mounting portion and the viscous damper and around the decoupling pin, and has an expansion head. A plurality of bolts, a holding member fixed to one of the upper mounting portion and the lower mounting portion and one of the viscous dampers and screwed to each bolt, an upper mounting portion, and under A receiving base fixed to one of the mounting portions and the other of the viscous dampers and having a receiving surface that is movably in contact with the expansion head of each bolt in a horizontal direction; and a holding member for each bolt A base-isolated building with a lock nut that adjusts the amount of protrusion.

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