JP5682036B2 - Structure for preventing overturning of a base-isolated building and a base-isolated building equipped with the structure - Google Patents

Description

  The present invention relates to a structure for preventing overturning of a base-isolated building and a base-isolated building having the structure.

  Conventionally, in high-rise buildings, seismic isolation devices such as laminated rubber have been installed between the upper structure and the lower structure, such as between the building body and the foundation. Shifting from the dominant period band to the long period side, the response acceleration is reduced to suppress shaking.

  On the other hand, in a base-isolated building where the aspect ratio is particularly large and a tipping moment is likely to occur due to rolling, shear deformation on each floor is required to prevent the upper structure (building body) supported by the base-isolating device from tipping over. It is necessary to suppress the corner to a certain value or less, and this upper structure also has a problem in that the strength (proof strength) corresponding to the upper structure is required and the cost is increased.

  On the other hand, in Patent Document 1, a plurality of first seismic isolation devices are installed between the lower structure and the upper structure, and a pulling force acting on these first seismic isolation devices is received as a compression force. A seismic isolation building is disclosed in which a second seismic isolation device (pullout resistance means) is installed.

  And in this patent document 1, as shown in FIG. 14, for example, while installing the 2nd seismic isolation apparatus 41 on the 2nd seismic isolation apparatus base part 40 formed in the outer peripheral part side of upper structure A1, The upper part of the second seismic isolation device 41 is fixed by the second seismic isolation device restraining part 42 which is fixed to the ground side, such as the seismic isolation pit housing and the adjacent building, and is disposed outside the building. Support. Thus, the second seismic isolation device 43 and the second seismic isolation device 41 exhibit seismic isolation performance against the roll of the building, and the pulling force acting on the first seismic isolation device 43 is used as the second seismic isolation device base part. 40 and the second seismic isolation device 41 sandwiched by the second seismic isolation device restraining part 42 can be received as a compressive force, substantially suppressing the locking of the upper structure A1 and overturning the upper structure A1. It becomes possible to prevent.

JP 2009-97243 A

  However, in the base-isolated building disclosed in Patent Document 1, as shown in FIG. 14, when the upper structure (building body) A1 moves to the left and right in the lateral direction T1 during the earthquake, the lower structure (foundation bottom plate) A2 And the second seismic isolation device holding portion 42 that supports the upper end portion of the second seismic isolation device 41 and the second seismic isolation device base portion 40 rigidly rigidly rigidly attached to the upper structure A1 are relatively It moves away, and the up-and-down allowance M of these 2nd seismic isolation apparatus holding | suppressing parts 42 and the 2nd seismic isolation apparatus base part 40 becomes small. And the 2nd seismic isolation device 41 deform | transforms so that it may exhibit a rhombus, and will receive the compressive force by a strong overturning moment, At this time, the 2nd seismic isolation device holding | suppressing part 42 and the 2nd seismic isolation device base part There is a concern that it becomes difficult to secure a sufficiently large reaction force because the cost M of 40 becomes small.

  In the conventional base-isolated building, if you want to attenuate the vertical and horizontal displacements of the base-isolated building at the time of earthquake, in other words, if you want to give the vertical and horizontal seismic control performance Separately, it was necessary to take measures such as installing oil dampers and lead dampers and putting lead plugs in the seismic isolation device itself.

  In view of the above circumstances, the present invention can reliably prevent overturning even in a building with a large aspect ratio while allowing rocking, and can provide vibration control performance in the vertical and horizontal directions. The purpose of this invention is to provide a structure for preventing overturning of a base-isolated building and a base-isolated building equipped with the structure.

  In order to achieve the above object, the present invention provides the following means.

  The structure for preventing overturning of a base-isolated building according to the present invention is a structure for preventing overturning of a base-isolated building in which a base-isolating device is interposed between an upper structure and a lower structure, and is disposed outside the base-isolated building. The outer fall prevention structure is provided, and the outer fall prevention structure extends the lower seismic isolation device fixing member of the lower structure connecting the lower end side of the seismic isolation device outward in the lateral direction. The outer projecting portion formed in this way and the upper seismic isolation device fixing member of the upper structure connecting the upper end side of the seismic isolation device are connected to each other, and a predetermined gap is formed laterally with the outer projecting portion. An outer fall prevention structure main body portion extending in the vertical direction and extending below the outer overhanging portion with a predetermined gap in the vertical direction, and the outer fall prevention structure main body portion and the It is characterized by being provided with a vibration control device between the vertical direction of the outer overhang part That.

  In this invention, when vibration energy acts due to an earthquake or the like and a roll occurs in a building, the seismic isolation device such as laminated rubber is deformed, so that the natural period of the upper structure is, for example, the dominant period band of seismic motion. Therefore, it is possible to suppress the shaking by reducing the response acceleration of the upper structure body.

  Further, the outer overhang portion of the outer fall prevention structure is formed to extend the lower seismic isolation device fixing member laterally outward, and the outer fall prevention structure main body portion is connected to the upper seismic isolation device fixing member. The upper portion is formed so as to extend in the vertical direction with a predetermined gap in the lateral direction from the outer overhang portion, and to extend under the outer overhang portion with a predetermined gap in the vertical direction. When the vibration energy acts on the structure and the rocking occurs so that the pull-out force acts on the seismic isolation device, it is possible to secure a large allowance between the outer overhanging portion and the outer fall prevention structure main body. it can.

  A base-isolated building of the present invention is a base-isolated building in which a base-isolating device is interposed between an upper structure and a lower structure, and is provided with the above-described structure for preventing overturning of the base-isolated building. And

  In this invention, it becomes possible to obtain the operational effect of the above-described structure for preventing overturning of a base-isolated building.

  In the seismic isolation building fall prevention structure of the present invention and the seismic isolation building equipped with the same, when the vibration energy acts on the upper structure and the shaking occurs so that the pulling force acts on the seismic isolation device, the outer side It is possible to secure a large allowance for the overhanging portion and the outer fall prevention structure main body portion. As a result, a sufficiently large reaction force can be ensured when the vibration control device installed between the outer overhanging portion and the outer fall prevention structure main body receives a compressive force due to a strong fall moment. Therefore, it is possible to handle the strong pulling force due to the overturning moment and to reliably increase the proof strength of the pulling force, and also to suppress the lifting of the seismic isolation device appropriately and vertically by rocking with the seismic control device The seismic energy can be absorbed, and the safety of the base-isolated building can be improved by preventing the fall.

  In addition, since the damping device can attenuate the displacement of the upper structure in the vertical and horizontal directions, a lead plug built in a hydraulic damper or seismic isolation rubber was originally used to obtain a damping effect. In addition to the conventional seismic control effect (horizontal damping effect), one device (a structure that prevents overturning) has three effects: a vertical seismic control effect, a horizontal seismic control effect, and a fall prevention effect. ) Can be realized.

  In addition, the overall damping effect can be enhanced by a well-balanced arrangement of the seismic isolation device and the vibration control device. In addition, by preventing falls and improving safety, the pillars and beams on the top of the seismic isolation device are squeezed to increase the shear deformation of the building, reducing the overall rigidity of the building, and reducing the volume of the frame. It is possible to reduce and provide an inexpensive building. In addition, since the energy in the vertical direction when the building is rocked by the earthquake motion can be absorbed and attenuated at the same time, the seismic force applied to the upper structure can be further reduced, and the amount of the frame can be reduced. And by providing a seismic isolation structure and a damping structure as mentioned above, it becomes possible to reduce the rigidity of a building and to provide a cheaper building.

It is a figure which shows the fall prevention structure of the seismic isolation building which concerns on one Embodiment of this invention, and a base isolation building. It is the X1-X1 arrow view figure of FIG. It is a figure which shows the outer fall prevention structure of the fall prevention structure of the seismic isolation building which concerns on one Embodiment of this invention, and an inner fall prevention structure. It is a figure which shows the inner side fall prevention structure of the fall prevention structure of the seismic isolation building which concerns on one Embodiment of this invention. It is a figure which shows an example of the damping device of the fall prevention structure of the seismic isolation building which concerns on one Embodiment of this invention. FIG. 6 is a view taken along line X1-X1 in FIG. 5. It is a figure which shows the state in which the horizontal force acted on the damping device shown in FIG. It is a figure which shows the state which the compression force acted on the damping device shown in FIG. It is a figure which shows the state which the tensile force acted on the damping device shown in FIG. It is a figure which shows the method of manufacturing the damping device main-body part of the damping device shown in FIG. It is a figure which shows the method of forming (manufacturing) and arrange | positioning the damping device shown in FIG. It is a figure which shows the state at the time of the vibration generation | occurrence | production of the seismic isolation building (fall prevention structure) which concerns on one Embodiment of this invention. It is a figure which shows the modification of the fall prevention structure of the seismic isolation building which concerns on one Embodiment of this invention. It is a figure which shows the state at the time of the vibration generation | occurrence | production of the conventional seismic isolation building (fall prevention structure).

  Hereinafter, with reference to FIGS. 1 to 12, a structure for preventing overturning of a seismic isolation building according to an embodiment of the present invention and a seismic isolation building including the same will be described.

  As shown in FIG. 1, the seismic isolation building A of this embodiment is a high-rise building with a large aspect ratio in which the seismic isolation device 1 is interposed between the upper structural body A1 and the lower structural body A2, and prevents falling. Structure B (B1, B2) is provided. The upper structure A1 is a building body composed of a plurality of layers, and includes beams, columns, slabs, outer walls, and the like, and the lower structure A2 includes a plurality of support piles 2 and a foundation bottom slab (foundation slab) 3. ing.

  In addition, this seismic isolation building A is provided with a seismic isolation device installation floor P in which columns 4 and beams are rigidly joined to the foundation bottom slab 3 of the lower structure A2 and further reinforced with seismic walls as necessary. . And the seismic isolation device 1 such as laminated rubber is mounted on the lower seismic isolation device fixing member 5 which is rigidly joined to the upper part of the seismic isolation device installation floor P. Further, an upper seismic isolation device fixing member 6 having a rigidly bonded beam is provided at the lower part of the upper structure A1, and the upper base is connected to the upper seismic isolation device fixing member 6 to provide the seismic isolation device 1. ing.

  That is, the seismic isolation building A of this embodiment is configured as an intermediate floor seismic isolation building in which the seismic isolation device 1 is provided on the intermediate floor above the lower structure A2 including the support pile 2 and the foundation bottom slab 3. Note that the seismic isolation device 1 is desirably installed so as to be displaceable in the vertical direction, as shown in FIGS. 5 and 6 of Patent Document 1, for example.

  The fall prevention structure B of the seismic isolation building according to the present embodiment is provided on the outer peripheral side of the building, and is arranged inside the outer fall prevention structure B1 disposed outside the seismic isolation building A and inside the seismic isolation building A. It is comprised with the inner side fall prevention structure B2 provided.

  Further, as shown in FIGS. 1 to 3, the outer fall prevention structure B <b> 1 includes an outer overhang portion 7 and an outer fall prevention structure main body portion 8, and the outer overhang portion 7 is provided on the seismic isolation device 1. The lower seismic isolation device fixing member 5 of the lower structure A2 connecting the lower end side is formed so as to extend outward in the lateral direction T1. As shown in FIG. 3, the outer fall prevention structure main body 8 is rigidly joined at one end to the upper seismic isolation device fixing member 6 of the upper structure A1, and is fixed to the outer overhanging portion 7 in the lateral direction T1. It extends in the up-down direction T2 with a gap H1, and is extended with predetermined gaps H2, H3 in the up-down direction T2 below and above the outer overhanging portion 7. That is, the outer fall-preventing structure main body 8 is formed in a U-shaped cross section, and is connected to the upper structure A1 so as to extend from the outside of the seismic isolation building A under the outer overhanging portion 7, The outer overhanging portion 7 is extended so as to overlap with the vertical direction T2 with gaps H2 and H3.

  Further, as shown in FIGS. 1 to 3, the outer fall prevention structure B <b> 1 of the present embodiment includes a seismic control device 9 instead of the seismic isolation device, and the seismic control device 9 includes the outer overhang portion 7 and the seismic control device 9. Ends are connected to the outer overhanging portion 7 and the outer overturn prevention structure main body 8 in both gaps H2 and H3 in the vertical direction T2 of the outer overturn prevention structure main body 8 respectively.

  On the other hand, as shown in FIGS. 1 to 4, the inner fall prevention structure B2 of the present embodiment includes an inner fall prevention structure main body 10, and the inner fall prevention structure main body 10 is formed of the upper structure A <b> 1. One end is rigidly joined and connected to the upper seismic isolation device fixing member 6, and the pair of side portions 10a and 10b extended in the vertical direction T2 and the other ends of the pair of side portions 10a and 10b are connected to each other in the lateral direction T1. And an inner extending portion 10c constructed (extended). That is, the inner fall prevention structure main body portion 10 of the present embodiment is formed in an inverted portal shape so that the lower seismic isolation device fixing member 5 is surrounded by the pair of side portions 10a and 10b and the inner extension portion 10c. It is arranged. Further, at this time, the inner fall prevention structure main body 10 includes the pair of side portions 10a and 10b and the transverse direction T1 of the lower seismic isolation device fixing member 5, the inner extension portion 10c, and the lower seismic isolation device. Predetermined gaps H4 and H5 are provided between the fixing member 5 and the vertical direction T2, respectively.

  Furthermore, in the inner fall prevention structure B2 of the present embodiment, the vibration control device 11 is provided in the gap H5 in the vertical direction T2 between the lower seismic isolation device fixing member 5 and the inner extension portion 10c. 11 is provided by connecting the end to the lower seismic isolation device fixing member 5 and the inner extension 10c. Further, a vibration control device 11 is also provided in a gap H6 in the vertical direction T2 between the lower seismic isolation device fixing member 5 and the upper seismic isolation device fixing member 6, and the seismic control device 11 has a lower part with a lower base isolation. The seismic device fixing member 5 and the upper seismic isolation device fixing member 6 are connected to each other.

  Here, for example, the damping devices 9 and 11 shown in FIGS. 5 and 6 can be applied to the damping devices 9 and 11 included in the outer fall prevention structure B1 and the inner fall prevention structure B2. In this example, the vibration control devices 9 and 11 are formed by laminating ultrahigh damping viscoelastic rubbers 13 and 14 on both sides with a metal plate 12 in between, and outside the ultrahigh damping viscoelastic rubbers 13 and 14. The rubber-side metal plate 15 is integrally laminated, and the base-side metal plate 17 is integrally laminated by being fixed to the rubber-side metal plate 15 with fixing bolts 16. The metal plate 12 disposed between the pair of ultrahigh damping viscoelastic rubbers 13 and 14 is a safety device fixing metal plate, and a safety device 18 made of metal, carbon fiber resin, or the like at the end thereof. Is attached.

  In addition, in the damping devices 9 and 11 shown in FIGS. 5 and 6, a plurality of longitudinal screw rebars 19 extending in the vertical direction (stacking direction) are provided on the base side metal plates 17 arranged on both outer sides. One end is welded and integrated. Further, the longitudinal screw rebar 19 is provided with a mechanical joint 20 at an intermediate portion, and is extended by the joint 20, and a T-shaped metal member 21 is attached to the extended other end. Further, a plurality of lateral screw rebars 22 extending in the horizontal direction at intervals in the vertical direction are provided between the vertical direction from one end of the vertical screw rebar 19 extending in the vertical direction to the middle portion. It is arranged. In addition, each lateral threaded reinforcing bar 22 is provided with mechanical joints 23 at both ends, and is extended by the joints 23, and T-shaped hardware 21 is attached to the extended one end and the other end, respectively. The vertical screw rebars 19 and the horizontal screw rebars 22 are arranged between the base-side metal plate 17 and the vertical screw rebar 19 to the joint (intermediate portion) 20 between the both ends of the horizontal screw rebar 22. The portion between the pair of joints 23 in the lateral direction is buried with concrete. In the present embodiment, this embedded portion is the PC concrete portion 24. Further, a concrete portion 27 composed of a reinforcing bar 25 and cast-in-place concrete 26 is provided so as to embed each PC concrete portion 24 above and below with the ultrahigh damping viscoelastic rubbers 13 and 14 therebetween.

  The ultra-high damping viscoelastic rubbers 13 and 14 are, for example, natural rubber damping materials, and have low temperature dependency, strain dependency, and speed dependency, and exhibit high damping properties against vibration. As a result, the damping devices 9 and 11 shown in FIGS. 5 and 6 configured as described above are deformed as shown in FIGS. 7, 8, and 9, respectively. Thus, the seismic energy can be absorbed with respect to three kinds of forces of horizontal force (FIG. 7), compressive force (FIG. 8), and tensile force (FIG. 9), and excellent seismic control performance is exhibited.

  When manufacturing such vibration control devices 9 and 11, first, at a first stage shown in FIG. 10A, the safety device fixing metal plate 12 is paired with a pair of ultrahigh damping viscoelastic rubbers 13. , 14, and a rubber-side metal plate 15 is bonded to the outside of each of the ultra-high damping viscoelastic rubbers 13, 14. Next, in the second stage shown in FIG. 10B (and FIG. 10A), the longitudinal screw rebar 19 having the same length is welded to the base side metal plate 17, and the mechanical joint 20 is attached to the intermediate portion. The base-side metal plate 17 in this state is fixed to each rubber-side metal plate 15 with fixing bolts 16. Next, in the third stage shown in FIG. 10C, the horizontal screw rebars 22 are disposed and the mechanical joints 23 are installed on the respective horizontal screw rebars 22. Next, in the fourth stage shown in FIG. 10 (d), the mold frame 30 is disposed and the fixing frame 31 and the filler are inserted. In the fifth stage shown in FIG. Fix with set bolt 32. Next, in a sixth stage shown in FIG. 10 (f), concrete is placed in the mold 30 from the direction of arrow F, and the mold 30 is removed after the concrete is hardened. A vibration control device main body 33 having ultrahigh damping viscoelastic rubbers 13 and 14 is formed therebetween. And this damping device main-body part 33 employ | adopts the PC conversion method in a factory, and is manufactured with sufficient precision.

  Next, the damping device main body 33 manufactured in this way is carried into the site, and the safety device 18 is fixed to the end of the safety device fixing metal plate 12 in the seventh stage shown in FIG. Next, in the eighth stage shown in FIG. 11 (b), the screw rebars 19 and 22 with the T-shaped hardware 21 are connected to the mechanical joints 20 and 23, and the vertical screw rebar 19 and the horizontal screw rebar 22 are connected. Respectively. Then, in the ninth stage shown in FIG. 11 (c), the reinforcing bars 25 are arranged, and in the tenth stage shown in FIG. 11 (d), the mold 34, the fixed frame 31 and the filler are installed. Then, as shown in FIG. 11 (e), in the eleventh stage, the cast-in-place concrete 26 is filled into the mold 34 from the injection hole, and the mold 34 is removed after the concrete is hardened. 11 is formed (manufactured) and disposed at a predetermined position.

  Here, it is not necessary to limit the seismic control devices 9 and 11 to those configured as described above. For example, a generator that generates power in accordance with relative displacement (vibration) between the upper structure A1 and the lower structure A2. And an electromagnet that is supplied with electric power from this generator to generate a magnetic force, and as shown in FIGS. 5 and 6, an electromagnet 35 is buried in the center of the concrete portion 27, and the magnetic force generated by the electromagnet 35. You may comprise so that the seismic energy which acted on the seismic isolation building may be attenuated. In this case, an excellent horizontal displacement attenuation function is imparted to the vibration control devices 9 and 11 by the electromagnet 35 and the like.

  Next, the operation and effect of the structure for preventing overturning B of the base-isolated building of the present embodiment having the above-described configuration and the base-isolated building A including the structure will be described.

  When vibration energy acts due to an earthquake or the like and a roll occurs in the building A, the seismic isolation device 1 such as laminated rubber is deformed, so that the natural period of the upper structure A1 is, for example, from the dominant period band of seismic motion. By shifting to the long period side, the response acceleration is reduced to suppress the shaking of the upper structure A1. In this way, excellent seismic isolation performance is exhibited by the seismic isolation device 1 as in the conventional base isolation building.

  On the other hand, when the vibration energy acts on the upper structure A1 and the left and right sway (rocking) occurs, a pulling force acts on the seismic isolation device 1. The outer overhanging portion 7 of the structure B1 and the outer fall prevention structure main body portion 8, and the lower seismic isolation device fixing member 5 and the inner fall prevention structure main body portion 10 (inner extension portion 10c) of the inner fall prevention structure B2. Thus, the amount of displacement of the upper structure A1 in the vertical direction T2 (the amount of swing of the upper structure A1) is regulated. Further, the outer overhang prevention part 7 of the outer fall prevention structure B1 and the outer fall prevention structure main body part 8 and the inner fall prevention structure main body part 10 (side part) of the lower seismic isolation device fixing member 5 and the inner fall prevention structure B2 are provided. 10a, 10b) regulates the amount of displacement in the horizontal direction (lateral direction) T1 of the upper structure A1. That is, since the outer fall prevention structure B1 and the inner fall prevention structure B2 are provided on the outer peripheral side of the seismic isolation building A, the outer overhanging portion 7 is moved horizontally by the outer fall prevention structure main body 8 in the horizontal direction T2. Displacement to T1 is restricted, and the lower seismic isolation device fixing member 5 may be displaced in the vertical direction T2 and the horizontal direction T1 by the inner extension portion 10c and the side portions 10a and 10b of the inner fall prevention structure main body portion 10. Be regulated. For this reason, the shaking of the upper structure A1 is suppressed to be small, the pulling force acting on the seismic isolation device 1 is suppressed to a low level, and the upper structure A1 is prevented from falling. Thus, the outer fall prevention structure B1 and the inner fall prevention structure B2 of the present embodiment can be used also as a displacement attenuating device and is economical.

  Further, at this time, the gaps H2 and H3 in the vertical direction T2 of the outer overhanging part 7 and the outer fall prevention structure main body part 8, the gap H5 in the vertical direction T2 of the inner extension part 10c and the lower seismic isolation device fixing member 5, In addition, in the vertical gap H6 between the upper seismic isolation device fixing member 6 and the lower seismic isolation device fixing member 5, seismic control devices 9 and 11 are installed instead of the seismic isolation device. For this reason, vibration energy acts on the upper structure A1 to cause vibration, and displacement (vibration energy) is attenuated by the vibration control devices 9 and 11. That is, the damping performance is exhibited with respect to the vibration energy that swings the upper structure A1 in the vertical and horizontal directions T1 and T2 by the vibration control devices 9 and 11. As a result, the shaking of the upper structure A1 can be suppressed more reliably, the pulling force acting on the seismic isolation device 1 can be suppressed low, and the upper structure A1 can be prevented from falling.

  Furthermore, in the fall prevention structure B of the seismic isolation building of this embodiment, as shown in FIG. 12, the outer overhanging portion 7 of the outer fall prevention structure B1 connects the lower seismic isolation device fixing member 5 to the lateral direction T1 outside. The outer fall-preventing structure main body 8 is connected to the upper seismic isolation device fixing member 6, and in the vertical direction T2 with a predetermined gap H1 in the lateral direction T1 with the outer overhanging portion 7. It is formed to extend below the outer overhanging portion 7 with a predetermined gap H2 (H3) in the vertical direction T2. For this reason, when vibration energy acts on the upper structure A1 and a swing occurs so that a pulling force acts on the seismic isolation device 1, the cost M of the outer overhanging portion 7 and the outer fall prevention structure main body portion 8 is increased. Will be greatly secured.

  Therefore, in the base-isolated building B of the present embodiment and the base-isolated building A having the same, when the vibration energy acts on the upper structure A1 and a shake occurs, Up and down direction T2 of upper structure A1 by outer overhanging part 7 and outer fall prevention structure main body part 8 and by upper seismic isolation device fixing member 6 and inner fall prevention structure main body part 10 of inner fall prevention structure B2. It is possible to regulate the amount of displacement in the horizontal direction T1. As a result, the swing of the upper structure A1 can be kept small while allowing the locking, the pulling force acting on the seismic isolation device 1 can be kept low, and the upper structure A1 can be prevented from overturning. Is possible.

  Further, when vibration energy acts on the upper structure A1 and a swing occurs so that a pulling force acts on the seismic isolation device 1, the margin M of the outer overhanging portion 7 and the outer fall prevention structure main body portion 8 is set. It can be secured greatly. Thereby, when the damping device 9 installed between the outer overhanging portion 7 and the outer fall prevention structure main body portion 8 receives a compressive force due to a strong fall moment, a sufficiently large reaction force can be ensured. Therefore, it is possible to process the strong pulling force due to the overturning moment and to reliably increase the proof strength of the pulling force, and to suppress the lifting of the seismic isolation device 1 with the seismic control device 9 (11). Seismic energy in the vertical and horizontal directions T1 and T2 due to rocking can be absorbed, and the safety of the seismic isolation building A can be improved by preventing the fall.

  Further, since the vibration control devices 9 and 11 can attenuate the displacement of the upper structure A1 in the vertical direction T2 and the horizontal direction T1, originally trying to obtain a damping effect, In addition to the conventional damping effect (horizontal damping effect), there are three effects: the vertical T2 damping effect, the horizontal T1 damping effect, and the fall prevention effect. Can be realized by a single device (falling prevention structure B (B1, B2)).

  In addition, the overall damping effect can be enhanced by a well-balanced arrangement of the seismic isolation device 1 and the vibration control devices 9 and 11. Furthermore, by preventing falls and improving safety, the pillars and beams at the top of the seismic isolation device 1 are squeezed, the shear deformation of the building A (A1) is increased, and the rigidity of the entire building A is reduced. Thus, it is possible to reduce the amount of the frame and provide an inexpensive building. Moreover, since the energy in the vertical direction T2 when the building is rocked by the earthquake motion can be absorbed and attenuated at the same time, the seismic force applied to the upper structure A1 can be further reduced, and the amount of the frame can be reduced. And it becomes possible to provide the cheaper building A by reducing the rigidity of the building A by providing a seismic isolation structure and a damping structure as mentioned above.

  As described above, the structure for preventing overturning of the base-isolated building according to the present invention and the embodiment of the base-isolated building having the structure have been described. However, the present invention is not limited to the above-described one embodiment, and departs from the spirit thereof. It is possible to change appropriately within the range not to be. For example, in the present embodiment, the description has been given on the assumption that the base-isolated building A is an intermediate floor base-isolated building, but the present invention may of course be applied to a basic base-isolated building. And when applying to the basic seismic isolation building A, as shown in FIG. 13, for example, as shown in FIG. 13, the U-shaped outer fall prevention structure main body portion 8 connected to the upper seismic isolation device fixing member 6 and the lower structure A2 The outer overhang prevention structure B1 may be configured by including the outer overhanging portion 7 extending outward from the horizontal direction T1. Moreover, from the inner side fall prevention structure main-body part 10 of the L-shaped cross section provided with the one side part 10a and the inner side extension part 10c connected to the foundation bottom plate 3 (lower structure A2), and the upper seismic isolation apparatus fixing member 6 You may comprise the inner side fall prevention structure B2 by providing the inner side overhang | projection part 44 extended in the horizontal direction T1. And even if it is a case where it comprises in this way, it is possible to obtain the effect similar to this embodiment.

DESCRIPTION OF SYMBOLS 1 Seismic isolation device 2 Support pile 3 Foundation bottom slab 4 Column 5 Lower seismic isolation device fixing member 6 Upper seismic isolation device fixing member 7 Outer overhanging portion 8 Outer fall prevention structure main body portion 9 Damping device 10 Inner fall prevention structure main body Part 10a Side part 10b Side part 10c Inner extension part 11 Damping device 12 Metal plate 13 Ultrahigh damping viscoelastic rubber 14 Ultrahigh damping viscoelastic rubber 15 Rubber side metal plate 16 Fixing bolt 17 Base side metal plate 18 Safety device 19 Longitudinal threaded reinforcing bar 20 Mechanical joint 21 T-shaped hardware 22 Lateral threaded reinforcing bar 23 Mechanical joint 24 PC concrete part 25 Reinforcement 26 Cast-in-place concrete 27 Concrete part 30 Formwork 31 Fixed frame 32 Temporary fixing bolt 33 Damping Device body 34 Form 35 Electromagnet 40 Second seismic isolation device base 41 Second seismic isolation device 42 Second seismic isolation device restraint 43 First seismic isolation device 44 Inner overhang A A Seismic isolation building A Upper structure A2 Lower structure B Fall prevention structure B1 Outer fall prevention structure B2 Outer fall prevention structure B1 Inner fall prevention structure H1 Gap H2 Gap H3 Gap H4 Gap H5 Gap H6 Gap P Seismic isolation device installation floor M Cost T1 Horizontal direction ( horizontal direction)
T2 vertical direction

Claims (2)

A structure for preventing overturning of a seismic isolation building in which a seismic isolation device is interposed between the upper structure and the lower structure,
It has an outer fall prevention structure disposed outside the seismic isolation building,
The outer fall prevention structure includes an outer projecting portion formed so as to extend a lower seismic isolation device fixing member of the lower structure connecting the lower end side of the seismic isolation device outward in the lateral direction, Connected to the upper seismic isolation device fixing member of the upper structure connecting the upper end side of the seismic device, extended vertically with a predetermined gap in the lateral direction with the outer overhang, and vertically An outer fall prevention structure main body extending below the outer overhanging portion with a predetermined gap, and a vibration control between the outer overturn prevention structure main body and the outer overhanging portion in the vertical direction. A structure for preventing overturning of a seismically isolated building, characterized by comprising a device. It is a seismic isolation building with a seismic isolation device interposed between the upper structure and the lower structure,
A base-isolated building comprising the structure for preventing overturning of the base-isolated building according to claim 1.

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