JP5290786B2 - Damping structure - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a seismic control structure capable of reducing the swing of a building by increasing the performances of the building against the external forces caused by earthquake and wind. <P>SOLUTION: A seismic-controlled building includes a middle-rise or a high-rise first building 200 of earthquake-resisting structure and a low-rise second building 100 of base-isolating structure. The first building 200 and the second building 100 are joined to each other so that a horizontal force can be transmitted by a joint member 100 provided to the upper side of a base-isolated layer. The primary natural frequency of the second building 100 alone is set longer than the natural frequency of the first building 200 alone. A plurality of stories are preferably present between the joint member 300 and a base-isolating and supporting position. The joint member 300 preferably does not transmit a bending moment, and may be formed of a damper or may have a damper. <P>COPYRIGHT: (C)2010,JPO&amp;INPIT

Description

  The present invention relates to a seismic control structure for improving performance against an external force caused by an earthquake or wind of a building and reducing the shaking of the building.

  In recent years, various seismic isolation and control structures have been proposed and put into practical use in order to improve the safety of buildings against earthquakes and winds. In general, the seismic isolation structure is a structure in which a base isolation layer is installed on the base of the building or an intermediate floor with a base isolation device using laminated rubber or sliding bearings to reduce the input external force and reduce the response of the building. It is. As a result, the entire building has a longer period, so the seismic isolation structure is often applied to low-rise RC structures with high rigidity and short periods. In recent years, however, high-rise steel structures and super-high-rise buildings have been used. Etc. are also applied. In addition, the damping structure is intended to reduce the response by absorbing the energy input to the building with a damper, and high-specification buildings that apply both of them are now not uncommon.

Japanese Patent No. 3677706 Japanese Patent No. 3425609

  The invention described in Japanese Patent No. 3425609 is generated in the base isolation layer because the main base isolation building having a large aspect ratio and a flat shape makes it difficult to design the base isolation system due to the overturning moment generated by the horizontal force. The purpose is to minimize the overturning moment by applying a horizontal force in the same direction as the horizontal force in the same direction from the auxiliary building.

  However, since the entire base layer of the building is constructed as a seismic isolation layer, the number of works related to the seismic isolation device increases and the construction period becomes longer, and the main high-rise part with a large aspect ratio and flat shape is seismically isolated. Then, even if the fall moment is made as small as possible, the seismic isolation device itself becomes expensive because the main part is seismically isolated.

  The present invention has been made in view of such circumstances, and provides a seismic isolation structure in which a seismic isolation structure is attached to a high-rise building designed with a seismic frame and the seismic isolation building is used for reducing the response of the high-rise building. This is the issue.

  In order to solve the above-described problems, the present invention includes a middle- or high-rise first building composed of an earthquake-resistant structure, and a low-rise second building constructed of a seismic isolation structure, The second building is a vibration-damped building joined to transmit a horizontal force by a joining member provided above the seismic isolation layer, and the first natural period of the second building alone is A seismic control building set longer than the natural period of one building alone is provided.

  In this specification, an earthquake-resistant frame is used to mean a frame that is not supported by a seismic isolation device. The first building and the second building are independent buildings in plan view, but may be constructed on a common basement or foundation structure. A building frame is a load support member such as a column, beam, or earthquake-resistant wall. The position where the first building and the second building are joined may be the top floor of the second building or the middle floor. Further, the joining member may be provided on a plurality of floors. The term “joined so as to transmit horizontal force” means that the joint member is rigidly joined to the first building and the second building, and that both ends or one end of the joint member are horizontally displaced relative to each other. In some cases, it is connected with a viscous or hysteretic damper. In addition, the viscous or hysteretic damper may be installed in the seismic isolation layer.

The natural period of the first (second) building alone means the natural period of the first (second) building when it is assumed that the coupling member does not exist. In the present specification, the term “natural period” is not particularly limited and refers to a primary natural period.
In the seismic control building having the above-described configuration, the first eigenmode having the largest stimulus coefficient is deformed in one direction at the same time as the first building is deformed in one direction (see FIG. 1, the deformation of the first building and the second building is substantially the same at the position of the joining member. In this mode, since the deformation of the seismic isolation layer of the second building becomes large, the vibration energy is effectively absorbed by the seismic isolation device, and the vibration of the damping building as a whole is suppressed. For that purpose, it is effective to use a sliding bearing and a rolling bearing with a friction coefficient of about 0.01 as the seismic isolation device for the second building, and to reduce the shear coefficient of the seismic isolation device part to 0.05 or less, which is half or less of the usual. It is. The shear coefficient of the device part is a value obtained by dividing the total shear force of the seismic isolation device part by the total weight of the two buildings.

  The joint member transmits a force generated due to a difference in response due to an external force such as an earthquake or wind of each building, and if it has a predetermined proof stress and rigidity, the type of structure such as a steel frame or RC structure There is no problem. If a damper is provided, the first and second buildings are joined by a damper, and if not provided, a joined structure using a member having a predetermined strength and rigidity is obtained.

  When the joining member is a damper, the natural period and natural vibration mode of the first building and the second building with the joining member removed are different, resulting in relative displacement between the two buildings. Response displacement during an earthquake or wind load can be suppressed.

  In the present invention, the seismic isolation building is connected to the main building with a relatively long cycle in the single building after the seismic isolation is performed to sufficiently reduce the response of the building with a short cycle unless the base building is seismic isolation. Structural safety is improved by placing a damper in the part (seismic isolation part / connection part) where the relative deformation difference between the two buildings occurs.

  The joining member preferably does not transmit a bending moment. In addition to the case where the joining member itself has a structure that does not transmit a bending moment, the case where at least the end portion is pin-joined is applicable.

  In the case of having the above configuration, since no moment is applied from the joining member to the first building or the second building frame, the stress design of the building frame is relaxed, and a more rational seismic design is possible.

  By using a damper as a joining member, vibration energy can be absorbed due to the relative displacement while allowing relative displacement between the first and second buildings. It becomes possible.

  The first building and the second building may be the same height building, but the first building may be higher than the second building. Further, the second building may be higher than the second building. When the first building is a high-rise building and the second building is a low-rise building, the displacement of the second building supported by seismic isolation is suppressed at the low-rise portion of the first building having the earthquake-resistant frame. When the second building is a low-rise building and the second building is a high-rise building, the first building suppresses the displacement of the lower layer portion of the second building supported by seismic isolation. In either case, the displacement is suppressed by connecting two buildings with different behaviors during an earthquake or a wind load. In the present specification, the medium-rise or high-rise building is for representing the height difference from the low-rise building, and includes cases where the number of floors and the height are not significantly different. For example, if the relative height difference is 10 m or more, or if there is a difference of three or more layers, one can be considered as a low-rise building and the other as a middle-rise or high-rise building. Further, if there is a substantial difference (for example, a difference of 10% or more) in a single natural period, a building with a short natural period may be considered as a low-rise building and the other as a middle-rise or high-rise building.

  The structural housings of the first and second buildings may be of the same type, but the first building may be a steel structure, and the second building may be a reinforced concrete structure or a steel reinforced concrete structure. . In particular, when the first and second buildings are not constructed at the same time, the structural enclosures of both buildings do not need to be of the same type, so the degree of freedom in design is great.

  A plurality of floors may exist between the joining member and the seismic isolation support position. That is, the second building may be seismically isolated and supported by the base portion, and may be joined to the first building by the joining member at the floor position on the fourth floor. It may be the top floor position of the building. Since the floor height of the seismic isolation support position and the joint position is separated, the horizontal deformation ability of the frame between the base isolation support position and the joint position of the second building can be effectively utilized. This is advantageous in designing the second building.

  The joining member joins the beams of the first building and the second building, and a wall or brace may be installed on the surface of the beam. In the event of an earthquake, external force from the first building or the second building is applied via the joint member, so walls or braces are installed on the beam construction surface to increase the rigidity of the frame and to deform the seismic isolation layer. It is preferable to collect and take attenuation. In addition, in order to increase the rigidity of the slab and efficiently transmit the horizontal force to the adjacent frame at the joining member position, it is preferable to consider the horizontal force as well as the vertical load and make the slab thicker than usual.

  In addition, in order to increase the rigidity of the slab and efficiently transmit the horizontal force to the adjacent frame at the joining member position, it is preferable to consider the horizontal force as well as the vertical load and make the slab thicker than usual.

  The joining member is preferably non-rigidly joined to the first building and / or the second building. Here, the non-rigid joint means a joint other than a joint method that completely transmits horizontal and vertical forces and moments, and a method that joins only a web of steel members, a method that uses a pin or a roller support member It is possible to use a method of joining with a damper.

  The present invention, or an existing building composed of a seismic frame is remodeled into a seismic isolation structure to make a long cycle, and a middle-high-rise building is constructed adjacent to this, above the seismic isolation support position of the existing building, The construction method of the seismic control building which joins the existing building and the middle-high-rise building so that the horizontal force at the time of earthquake is transmitted is proposed.

  DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below with reference to the accompanying drawings. However, the accompanying drawings and embodiments are merely described to help understanding of the present invention, and the present invention is not limited to the accompanying drawings and embodiments. It is obvious that the intention is not limited to examples.

  FIG. 1 is a plan view showing an embodiment of a vibration-damping structure building according to the present invention. A second building 100 that is seismically isolated so as to surround three sides of the first building 200 composed of an earthquake-resistant frame is constructed, and both are joined by a joining member 300 at a floor level of a specific floor. Yes. In the plan view, the joining member 300 is provided on the extension of the frame having the earthquake-resistant wall 120 or the brace, and both ends are rigidly joined to the first building 200 and pin-joined to the second building 100. As a result, the structure transmits horizontal force between both buildings but does not transmit bending moment.

  Although the said Example is a plane structure where the 2nd building surrounded 3 sides of the 1st building 200, the 2nd building may be provided only in one or two sides of the 1st building. You may surround all sides. The relationship between the first building 200 and the second building may be reversed. That is, the first building may have a planar configuration that surrounds three or four sides of the second building, or the first building and the second building may be adjacent one-on-one. Further, the joining member 300 may be one in which both ends are instructed to be pinned, or may be one in which a damper is incorporated or provided.

  FIG. 2 is a longitudinal sectional view exaggeratingly showing deformation during an earthquake in the second embodiment of the present invention. In the second embodiment, the second buildings 100 and 140 that are seismically isolated and supported by the seismic isolation device 110 are constructed adjacent to both sides of the first building 200 composed of the seismic frame. The first building and the second building are joined together by joint parts 300, 302, and 304. The position of the joining member 300 that joins the first building 200 and the second building 100 is the floor level of the sixth layer from the bottom of the first building 200, the roof of the second building 100 (the roof of the third layer from the bottom). ) Position. The first building 200 and the second building 140 are joined by the joining member 300 from the bottom of the second building 140 at the floor level of the third layer and the fourth layer.

  As is apparent from the figure, the second building 100 is seismically isolated at the position below the first floor and is joined to the first building 200 by the third floor roof, so there is a distance of three layers between them. . Since there is a distance of three layers between the seismic isolation device 110 and the joint member 300, the second building is restrained from being deformed at the time of the earthquake at the roof position by the first building 100 (seismic support). At the same time, the deformation ability of the three layers can be utilized effectively. By adopting the structure shown in the figure, for example, as compared with a structure in which a joining member is provided at the first floor position or the second floor position of the second building, the deformability and immunity of the second building are reduced. The deformation capability of the seismic device will be used effectively.

As shown in the figure, the second building 140 is joined to the first building 200 at two locations of the third floor position and the fourth floor position. There may be a plurality of joining positions, and it may not be on the top floor. In the above embodiment, the first building 200 is a relatively high-rise building and the second building is a relatively low-rise building, but the height of the building is not limited to these. In addition, the first building and the second building may be constructed at different times. For example, the second building, which is a conventional building, may be newly supported by seismic isolation and may be joined to the newly constructed first building.
The top view which shows one Example of the vibration suppression structure building based on this invention Longitudinal sectional view exaggerating the deformation at the time of earthquake in the second embodiment of the present invention

Claims (5)

It includes a middle- or high-rise first building composed of an earthquake-resistant structure and a low-rise second building constructed of a seismic isolation structure, and the first building and the second building are provided above the seismic isolation layer A vibration-damping building joined so as to transmit a horizontal force by the joined member, wherein the joining member is a member that is not a damper and has a predetermined proof strength and rigidity, and the natural period of the second building alone Is a seismic control building that is set longer than the natural period of the first building alone and absorbs vibration energy by the seismic isolation structure .   The joining member joins the beams of the first building and the second building, and the second building is joined so that the horizontal force is transmitted to a lower floor or another construction surface. The seismic control building according to claim 1, wherein braces or face materials are installed vertically or horizontally adjacent to the beam to increase rigidity.   The vibration control structure building according to claim 1 or 2, wherein the joining member is non-rigidly joined to the first building and / or the second building.   The damping structure building according to any one of claims 1 to 3, wherein the first building has a steel structure, and the second building has a reinforced concrete structure or a steel reinforced concrete structure. An existing building composed of seismic frames is remodeled into a seismic isolation structure to extend the period, and a medium-to-high-rise building is constructed adjacent to it. It is a construction method of a vibration- damping building that joins the existing building and the middle-high-rise building with a joining member so that force is transmitted, the joining member being a member having a predetermined proof strength and rigidity, not a damper, The natural period of the existing building alone is set longer than the natural period of the medium- and high-rise building alone, and the seismic isolation structure is constructed by absorbing vibration energy by the seismic isolation structure .

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