Reinforced concrete and wooden earthquake-resistant high-rise buildings

Abstract

The present invention provides a base-isolated high-rise building that effectively suppresses the increase in force during earthquakes that causes the whip-like motion, and enables the efficient construction of a building in which a high-rise section with a small floor area extends from a low-rise section. [Solution] A seismically isolated high-rise building is constructed including a lower floor 20 made of reinforced concrete and an upper floor 30 made of a wooden hybrid structure, wherein an intermediate seismic isolation layer 40 is interposed between the lower floor 21 and the upper floor 22 of the lower floor 20. The floor area of ​​the upper floor 30 made of a wooden hybrid structure is smaller than the floor area of ​​the lower floor 20 made of reinforced concrete, and the upper floor 30 made of a wooden hybrid structure is erected in an off-center position within the planar area of ​​the lower floor 20 made of reinforced concrete, for example, eccentrically to the west.

Description

Technical Field

[0001] The present invention relates to a seismic isolation high-rise building made of reinforced concrete and wood, and particularly relates to a seismic isolation high-rise building made of reinforced concrete and wood, which includes a lower layer composed of multiple floors with a reinforced concrete structure and an upper layer composed of multiple floors with a wood hybrid structure.

Background Art

[0002] Preferably, as part of recent efforts towards ESG / SDGs, for example, it is recommended to construct medium-rise to high-rise buildings using a large amount of wood materials. Wood materials require less energy for processing compared to other materials, and their long-term use at multiple stages contributes to preventing global warming and forming a recycling-oriented society. They can also absorb carbon dioxide and fix carbon, thus attracting attention from the perspective of decarbonization.

[0003] In addition, when constructing medium-rise to high-rise buildings using wood materials, it is considered that the strength is likely to be insufficient. Therefore, for the purpose of efficiently ensuring a predetermined strength while using a large amount of wood materials, hybrid buildings constructed using wood materials and non-wood materials formed of steel frames or concrete (for example, see Patent Document 1), and wooden / RCC (reinforced concrete) mixed-structure buildings constructed by combining wood construction and RCC construction (for example, see Patent Documents 2 and Non-Patent Document 1) have been developed.

[0004] Furthermore, in Japan, where earthquakes are frequent, there is a demand for buildings, such as mid-to-high-rise and high-rise buildings, to be equipped with seismic isolation functions. For example, mid-to-high-rise seismically isolated buildings with a wooden hybrid structure have been developed, which combines wood and reinforced concrete (RC) construction with seismic isolation functions (see, for example, Non-Patent Documents 2 and 3). In the wooden hybrid seismically isolated buildings described in Non-Patent Documents 2 and 3, since it is difficult to provide seismic isolation functions to the wooden portion, base isolation is employed. Base isolation involves, for example, installing seismic isolation devices between multiple lower concrete base sections that protrude upward from the foundation slab in a reinforced concrete underground pit, which together with the foundation piles to form the foundation of the building, and multiple upper concrete base sections that protrude downward from the reinforced concrete base slab, which is the base of the building that transmits the building's load to the foundation slab. By enabling the lateral relative movement of the building with respect to the foundation slab via the seismic isolation devices, it is possible to provide seismic isolation functionality to wooden hybrid structures. [Prior art documents] [Patent Documents]

[0005] [Patent Document 1] Japanese Patent Publication No. 2019-100057 [Patent Document 2] Japanese Patent Publication No. 2024-104599 Public Relations [Non-patent literature]

[0006] [Non-Patent Document 1] Dai-ichi Life Insurance Company, Limited, Shimizu Corporation, 'Plan for a rental office building with a wooden hybrid structure in Kyobashi, Chuo-ku, Tokyo: First in the insurance industry to be selected for the Sustainable Building Leading Project (Wooden Leading Type)', [online], February 28, 2023, Shimizu Corporation, [Retrieved September 26, 2024], Internet<URL:https: / / www.shimz.co.jp / company / about / news-release / 2023 / 2022074.html> [Non-Patent Document 2] Yoshihiro Sasaki, et al., 'Technical Report: Mid-rise Apartment Building with Wood Hybrid Structure - Anesis Chayagasaka -', [online], April 2021, GBRC Journal Vol. 46 No. 2, [Retrieved September 26, 2024], Internet<URL:https: / / www.gbrc.or.jp / assets / documents / gbrc / GBRC184_889.pdf> [Non-Patent Document 3] Fumiki Nakamura, et al., 'Technical Report: Nagato City Hall - Aiming to be a Model Project for Large-Scale Layered Wooden Structures -', [online], July 2020, GBRC Journal Vol. 45 No. 3, [Retrieved September 27, 2024], Internet<URL:https: / / www.gbrc.or.jp / assets / documents / gbrc / GBRC181_873.pdf> [Non-Patent Document 4] Takenaka Corporation, 'Achieving a safe and secure "Premium Safety Building(R)" with a seismic isolation and damping hybrid structure employing "foundation seismic isolation + concentrated damping on intermediate floors" - First application to the "Yomiuri Television New Headquarters"', [online], July 5, 2019, Takenaka Corporation, [Retrieved October 10, 2024], Internet<URL:https: / / www.takenaka.co.jp / news / 2019 / 07 / 02 / index.html> [Overview of the project] [Problems that the invention aims to solve]

[0007] However, in wooden hybrid structures equipped with seismic isolation through base isolation, as described in Non-Patent Documents 2 and 3, the underground pit for providing base isolation must occupy a planar area larger than the planar area of ​​the building's base, considering that the building should be able to move considerably laterally relative to the base slab during an earthquake. This imposes constraints on the design of the building within a limited site area. Furthermore, since wooden hybrid structures are lighter and more flexible than reinforced concrete structures, the amplitude of vibrations in the upper floors tends to increase when the building is made taller. For these reasons, there is a need for the development of new technologies that can efficiently and effectively provide seismic isolation functionality to wooden hybrid structures, such as high-rise buildings of six stories or more, so that the building can continue to be supported in a stable state during an earthquake.

[0008] Furthermore, in the case of base isolation, if the building with base isolation has a large floor area in the lower part, the plan shape changes in the middle floors, and the long, narrow upper part extends in a tower-like shape, a so-called base-platform shaped building (see Non-Patent Literature 4), the acceleration increases with the upper floors, and the force during an earthquake increases, making the whip-swing phenomenon more likely to occur. Therefore, it is desirable to be able to effectively suppress the increase in the force during an earthquake that causes such a whip-swing phenomenon.

[0009] The present invention aims to provide a reinforced concrete and wooden high-rise building with seismic isolation that can efficiently and effectively provide seismic isolation functionality without base isolation, even in high-rise buildings of six stories or more, including wooden hybrid structures, so that the building can continue to be supported in a stable state during an earthquake, and that can efficiently suppress the increase in force during an earthquake that causes the whip-like phenomenon, thereby enabling the efficient construction of a building in which a high-rise section with a smaller floor area extends upward from a low-rise section with a larger floor area. [Means for solving the problem]

[0010] The present invention relates to a reinforced concrete and wooden high-rise building with seismic isolation, comprising a lower floor consisting of multiple floors made of reinforced concrete and an upper floor consisting of multiple floors made of a wooden hybrid structure, wherein an intermediate seismic isolation layer is provided between the lower and upper floors of the reinforced concrete lower floor, and multiple seismic isolation operating parts are provided in the intermediate seismic isolation layer, distributed at multiple locations, which support the ceiling slab of the lower floor and the floor slab of the upper floor so as to be able to move relative to each other in the lateral direction, and each of the seismic isolation operating parts comprises a lower concrete base that protrudes upward as a whole from the ceiling slab of the lower floor and an upper concrete base that protrudes downward as a whole from the floor slab of the upper floor The above objective is achieved by providing a reinforced concrete and wooden high-rise building with seismic isolation, comprising a base portion and a seismic isolation device installed sandwiched between these concrete base portions, and the intermediate concrete wall of the intermediate floor seismic isolation layer, including the outer perimeter wall erected between the ceiling slab of the lower floor and the floor slab of the upper floor, being formed in a state where it is divided vertically by seismic isolation slits, the floor area of ​​the upper floor made of wooden hybrid structure being smaller than the floor area of ​​the lower floor made of reinforced concrete structure, and the upper floor made of wooden hybrid structure being erected eccentrically in an off-center position within the planar area of ​​the lower floor made of reinforced concrete structure.

[0011] Furthermore, in the reinforced concrete and wooden seismically isolated high-rise buildings of the present invention, it is preferable that the first floor of the lower level is designated as the lower floor, the second floor as the upper floor, and the intermediate seismic isolation layer is interposed between them.

[0012] Furthermore, in the reinforced concrete and wooden seismically isolated high-rise buildings of the present invention, the planar area of ​​the lower floor has a rectangular planar shape with a long side and a short side, and it is preferable that the eccentricity ratio due to the eccentricity of the centroid position of the planar area of ​​the upper floor with respect to the centroid position of the planar area of ​​the lower floor is 0 to 35% in the direction of the long side and 0 to 35% in the direction of the short side.

[0013] Furthermore, in the reinforced concrete and wooden seismically isolated high-rise building of the present invention, a reinforced concrete elevator shaft is provided extending downward to the floor slab of the lowest floor of the lower floor, with the elevator shaft extending vertically through the upper floor which is a wooden hybrid structure, and supported at least by the floor slab of the upper floor which forms the intermediate seismic isolation layer. Preferably, the elevator shaft is inserted into the openings formed in the ceiling slab of the lower floor which forms the intermediate seismic isolation layer, while maintaining a predetermined distance between the opening edge of the insertion opening formed in the ceiling slab of the lower floor which forms the intermediate seismic isolation layer, and at least the opening edge of the insertion opening formed in the floor slab of the lower floor below. [Effects of the Invention]

[0014] The present invention provides a reinforced concrete and wooden seismically isolated high-rise building that can efficiently and effectively provide seismic isolation functionality without base isolation, even in high-rise buildings of six stories or more, including wooden hybrid structures, so that the building can continue to be supported in a stable state during an earthquake. Furthermore, it effectively suppresses the increase in force during earthquakes that causes the whip-like phenomenon, and enables the efficient construction of a building in which a high-rise section with a smaller floor area extends upward from a low-rise section with a larger floor area. [Brief explanation of the drawing]

[0015] [Figure 1] This is a broken perspective view showing a reinforced concrete and wooden earthquake-resistant high-rise building with the outer walls removed, illustrating a preferred embodiment of the present invention. [Figure 2] This is a schematic cross-sectional view along AA in Figure 5 illustrating a preferred embodiment of the present invention: a reinforced concrete and wooden earthquake-resistant high-rise building. [Figure 3] This is a schematic cross-sectional view along BB in Figure 5 illustrating a preferred embodiment of the present invention: a reinforced concrete and wooden earthquake-resistant high-rise building. [Figure 4] It is a schematic cross-sectional view along C-C of FIG. 2, explaining a seismic isolation high-rise building made of reinforced concrete and wood according to a preferred embodiment of the present invention. [Figure 5] It is a schematic cross-sectional view along D-D of FIG. 2, explaining a seismic isolation high-rise building made of reinforced concrete and wood according to a preferred embodiment of the present invention. [Figure 6] It is a schematic cross-sectional view along E-E of FIG. 2, explaining a seismic isolation high-rise building made of reinforced concrete and wood according to a preferred embodiment of the present invention. [Figure 7] It is an enlarged view of part F of FIG. 2, explaining the seismic isolation slit provided in the intermediate floor concrete wall.

Embodiments for Carrying out the Invention

[0016] The seismic isolation high-rise building 10 made of reinforced concrete and wood according to a preferred embodiment of the present invention is, as shown in FIG. 1, preferably a high-rise building with 6 or more floors, for example, an 8-story building, and has a seismic isolation function, so that it can continue to hold the building in a stable state during an earthquake. The seismic isolation high-rise building 10 of the present embodiment is composed of a lower layer 20 consisting of, for example, two floors with a reinforced concrete structure and an upper layer 30 consisting of, for example, six floors with a wooden hybrid structure, and is a building made of reinforced concrete and wood. Further, the floor area of the upper layer 30 with the wooden hybrid structure is preferably smaller than the floor area of the lower layer 20 with the reinforced concrete structure, and the upper layer 30 is eccentrically arranged and erected at a position biased, for example, to the west side as a predetermined direction within the plane area of the lower layer 20 (see FIGS. 1, 2, 5, and 6). The seismic isolation high-rise building 10 of the present embodiment is a building made of reinforced concrete and wood, and has a seismic isolation function without adopting base isolation, so that it can be efficiently designed within a limited site without being restricted by the exclusive area of the underground pit for providing base isolation, and at the same time, effectively suppresses the increase in the force causing the whip effect during an earthquake, and can exhibit the seismic isolation function in a more stable state.

[0017] Furthermore, the reinforced concrete and wooden high-rise building 10 of this embodiment is, as shown in Figure 1, a high-rise building for example, eight stories high, comprising a lower floor 20 consisting of multiple floors (preferably two floors in this embodiment) made of a reinforced concrete structure and an upper floor 30 consisting of multiple floors (preferably six floors in this embodiment) made of a wooden hybrid structure. As also shown in Figures 2 and 3, an intermediate floor seismic isolation layer 40 is provided interposed between the lower floor (preferably the first floor in this embodiment) 21 and the upper floor (preferably the second floor in this embodiment) 22 of the reinforced concrete lower floor 20. The intermediate floor seismic isolation layer 40 is provided with seismic isolation operating parts 43 distributed at multiple locations, which support the ceiling slab 41 of the lower floor 21 to the floor slab 42 of the upper floor 22 so that they can move relative to each other in the lateral direction (see Figure 4). Each seismic isolation operating section 43 is composed of a lower concrete base section 41a that protrudes upward as a whole from the ceiling slab 41 of the lower floor 21, an upper concrete base section 42a that protrudes downward as a whole from the floor slab 42 of the upper floor 22, and a seismic isolation device 47 that is installed sandwiched between these concrete base sections 41a and 42a. Furthermore, the intermediate floor concrete wall 45 of the intermediate floor seismic isolation layer 40, including the outer perimeter wall 45a, which is erected between the ceiling slab 41 of the lower floor 21 and the floor slab 42 of the upper floor 22, is formed in a state where it is divided vertically by a seismic isolation slit 46 (see Figures 2 and 7). Furthermore, the floor area of ​​the upper floor 30, which is constructed using a wooden hybrid structure, is smaller than the floor area of ​​the lower floor 20, which is constructed using a reinforced concrete structure. The upper floor 30, constructed using a wooden hybrid structure, is positioned in an off-center location within the planar area of ​​the lower floor 20, which is constructed using a reinforced concrete structure. For example, it is positioned eccentrically to the west.

[0018] Furthermore, in the seismically isolated high-rise building 10 of this embodiment, as shown in Figure 3, preferably an upper floor 30 made of a wooden hybrid structure is penetrated vertically by a reinforced concrete elevator shaft 35, which is supported by the floor slab 42 of the upper floor 22 that forms at least the intermediate seismic isolation layer 40, and extends downward to a height reaching the floor slab 21a of the 1st floor 21, which is the lowest floor of the lower floor 20. The elevator shaft 35 is inserted into the insertion openings 41b, 21b, while maintaining a predetermined distance 41c, 21c between the opening edge of the insertion opening 41b formed in the ceiling slab 41 of the 1st floor 21, which is the lower floor that forms the intermediate seismic isolation layer 40, and the opening edge of the insertion opening 21b formed in the floor slab 21a of the 1st floor 21, which is at least the lower floor below, and these insertion openings 41b, 21b.

[0019] In this embodiment, the seismically isolated high-rise building 10 is constructed, for example, as an employee dormitory, as shown in Figures 1 to 3. The first floor 21, which is the lowest floor of the lower floor 20, a two-story reinforced concrete structure, is formed as a public space mainly equipped with a dining hall, bathhouse, garbage disposal area, etc. The second floor 22 of the lower floor 20, which is separated by the intermediate seismic isolation layer 40, and the third to eighth floors above the lower floor 20, which are a wooden hybrid structure, are formed as living spaces with multiple private rooms for each employee. In this embodiment, the intermediate seismic isolation layer 40, which provides seismic isolation functionality, is formed as a dedicated seismically isolated space that is not normally accessed by residents, in the area between the first floor 21, which is formed as a public space, and the second floor 22, which is formed as a living space, in the lower floor 20, which is a reinforced concrete structure.

[0020] In this embodiment, the intermediate floor seismic isolation layer 40 constituting the seismically isolated high-rise building 10 is interposed between the first floor 21, which is the lowest floor, and the second floor 22, which is the highest floor, of the lower floor 20, which is a reinforced concrete structure, and is provided so as to fit within the same planar area as these lower floors 21 and 22 without protruding outward from them. The intermediate floor seismic isolation layer 40 is composed of a ceiling slab 41 of the first floor 21, which is also the floor slab of the intermediate floor seismic isolation layer 40, a floor slab 42 of the second floor 22, which is also the ceiling slab of the intermediate floor seismic isolation layer 40, and a plurality of seismic isolation operating parts 43 interposed between the ceiling slab 41 of the first floor 21 and the floor slab 42 of the second floor 22, supporting the ceiling slab 41 so that it can move laterally relative to the floor slab 42. Furthermore, the intermediate floor concrete wall 45 of the intermediate floor seismic isolation layer 40, including the outer perimeter wall 45a, which is erected between the ceiling slab 41 of the first floor 21 and the floor slab 42 of the second floor 22, is formed in a state where it is divided vertically by seismic isolation slits 46, without supporting any load from above via the ceiling slab 41, as shown in Figures 2 and 7.

[0021] The floor slab 42 of the second floor 22 constituting the seismically isolated high-rise building 10 is made of cast-in-place concrete poured by a known method after the formwork for the slab is appropriately assembled together with temporary scaffolding. As shown in Figures 1 and 2, the floor slab 42 is preferably formed integrally with the ceiling beams 44, which are arranged in a grid pattern at predetermined intervals in the vertical and horizontal directions on the ceiling portion of the intermediate seismic isolation layer 40 and supported by these ceiling beams 44. Multiple upper concrete base portions 42a are provided on the floor slab 42, each projecting downward from the intersections of the grid-like ceiling beams 44 on its underside with a projection height of, for example, about 1800 mm, and preferably having a rectangular plan shape with dimensions of about 1500 to 1800 mm in both length and width, distributed vertically and horizontally (see Figure 4).

[0022] The ceiling slab 41 of the first floor 21, which constitutes the base-isolated high-rise building 10, is also made of cast-in-place concrete poured by a known method after the formwork for the slab is appropriately assembled together with temporary scaffolding. The ceiling slab 41 is supported by floor beams 48 which are arranged in a grid pattern at predetermined intervals in the vertical and horizontal directions on the floor portion of the intermediate base-isolation layer 40, and is formed integrally with these floor beams 48. On the upper side of the ceiling slab 41, at positions corresponding to the multiple upper concrete base portions 42a that protrude downward from the floor slab 42 of the second floor 22, there are preferably multiple lower concrete base portions 41a, each having a rectangular cross-sectional shape similar to the upper concrete base portions 42a, with dimensions of approximately 1500 to 1800 mm in both length and width, and are provided, for example, with a projection height of approximately 500 mm, protruding upward and distributed vertically and horizontally (see Figure 4).

[0023] Furthermore, between the multiple upper concrete base portions 42a that protrude downward from the floor slab 42 of the second floor 22 and the multiple lower concrete base portions 41a that protrude upward from the ceiling slab 41 of the first floor 21, known seismic isolation devices 47, such as high-damping rubber laminated bearings, elastic sliding bearings, and linear rolling bearings, are installed so as to be sandwiched between these upper and lower base portions 41a and 42a. As a result, seismic isolation operating units 43, which include the lower concrete base portions 41a, the upper concrete base portions 42a, and the seismic isolation devices 47, are interposed between the ceiling slab 41 of the lower floor 21 and the floor slab 42 of the upper floor 22 and are provided at multiple locations. This also makes it possible to support the ceiling slab 41 from the floor slab 42 so as to allow relative movement in the lateral direction by the multiple seismic isolation operating units 43.

[0024] Furthermore, in this embodiment, as shown in Figure 4, known damper devices 49 can be installed at multiple locations in the intermediate floor seismic isolation layer 40 at appropriate positions. The damper devices 49 can be installed by connecting one end to the ceiling slab 41 of the first floor 21 and the other end to the floor slab 42 of the second floor 22, for example, by extending two damper devices 49 in the east-west direction and three damper devices 49 in the north-south direction. Because the damper devices 49 are installed at multiple locations in the intermediate floor seismic isolation layer 40 at appropriate positions, the stress due to the resistance of the damper devices 49 is distributed and transmitted, making it possible to reduce displacement during an earthquake without concentrating large stresses locally.

[0025] In this embodiment, the intermediate floor concrete wall 45, including the outer perimeter wall 45a, which is erected between the ceiling slab 41 of the first floor 21 and the floor slab 42 of the second floor 22 and installed in the intermediate floor seismic isolation layer 40, is formed in a state where it is divided vertically by seismic isolation slits 46. The seismic isolation slits 46 are formed by creating slit-shaped gaps, preferably with a spacing of about 50 mm, at a predetermined height position in the intermediate portion of the intermediate floor concrete wall 45 in the height direction, traversing the intermediate floor concrete wall 45 throughout the entire intermediate floor seismic isolation layer 40. As shown in Figure 7, for example, in the outer perimeter wall 45a, the gaps formed by the seismic isolation slits 46 are preferably filled with a gap-filling material 46a such as rock wool or fire-resistant joint material, and a trim material 46b, for example made of aluminum, can be attached to cover the gaps formed by the seismic isolation slits 46 from the outside. This makes it possible to prevent wind and rain from entering the building from the outside through the gaps formed by the seismic isolation slits 46.

[0026] Furthermore, since the intermediate floor concrete wall 45 of the intermediate floor seismic isolation layer 40, including the outer perimeter wall 45a, is formed in a state where it is divided vertically via a seismic isolation slit 46, during an earthquake, when the floor slab 42 of the upper floor 22 moves laterally relative to the ceiling slab 41 of the lower floor 21 due to the action of the seismic isolation device 47 of the seismic isolation operating unit 43 in the intermediate floor seismic isolation layer 40, it is possible to avoid such lateral movement being hindered by the intermediate floor concrete wall 45 interposed between them, thereby allowing for smooth lateral movement.

[0027] In this embodiment, as described above, the second floor 22 of the reinforced concrete lower floor 20 is preferably the top floor of the lower floor 20, and the intermediate floor seismic isolation layer 40 is interposed between the second floor, which is the top floor of the lower floor 20, and the first floor 21, which is preferably the bottom floor. Furthermore, the second floor 22, which is the top floor of the reinforced concrete lower floor 20, is entirely made of reinforced concrete, including the portion of its ceiling slab 23 that also serves as the floor slab of the third floor 31, which is the bottom floor of the upper floor 30. In this embodiment, sufficient superimposed load on the seismic isolation device 47 of the multiple seismic isolation operating parts 43 constituting the intermediate floor seismic isolation layer 40 is ensured by the weight of the concrete, which has a large unit weight, thereby increasing the natural period above the intermediate floor seismic isolation layer 40 and ensuring the effectiveness of the seismic isolation structure.

[0028] In other words, in this embodiment, the upper floors 30, consisting of six floors from the 3rd floor 31a to the 8th floor 31f, which are continuous above the lower floor 20 made of reinforced concrete, are a wood-reinforced concrete hybrid structure, preferably a wood-reinforced concrete hybrid structure that combines wood and reinforced concrete (RC) construction, mainly using wood materials with a small unit weight. As a result, the overall weight of the upper floors 30 is lighter compared to an RC structure, which may mean that in the event of an earthquake, it may not be possible to secure a sufficient superimposed load to properly function the seismic isolation devices 47 of the multiple seismic isolation operating parts 43 of the intermediate floor seismic isolation layer 40. In this embodiment, by making the entire 2nd floor 22, including the ceiling slab 23 portion of the 2nd floor 22 which is also the floor slab of the 3rd floor 31a, the lowest floor of the upper floors 30, a reinforced concrete structure with considerable weight, it is possible to secure a sufficient superimposed load on the seismic isolation devices 47 of the seismic isolation operating parts 43.

[0029] In this embodiment, the second floor 22, which is the top floor of the lower floor 20 of the reinforced concrete structure, is formed as a living space with multiple private rooms, as described above. As shown in Figure 5, the second floor 22 has a roughly L-shaped plan, consisting of a western main floor section 22a having a wider plan in the north-south direction, obtained by cutting out, for example, a quarter of the northeast horizontally elongated rectangular plan in the east-west direction, and an overhanging floor section 22b having a narrower width in the north-south direction, which extends eastward from approximately the southern half of the main floor section 22a.

[0030] On the second floor 22 of the reinforced concrete structure, a corridor 22c is provided that traverses the central north-south part of the main floor 22a and extends further east-west along the northern edge of the cantilevered floor 22b. To the south of the corridor 22c, for example, 10 private rooms 25 are provided, separated by a reinforced concrete partition wall 22d, and are connected in an east-west direction from the main floor 22a to the cantilevered floor 22b, with access from the corridor 22c. To the north of the corridor 22c on the main floor 22a, for example, 2 private rooms 25 are provided in the western part, separated by a partition wall 22e made of gypsum board or the like, with access from the corridor 22c. Adjacent to the east of these, a concrete core section 50 with a rectangular cross-section of reinforced concrete structure is provided, where the elevator shaft 35, described later, is located. Adjacent to the east of the concrete core section 50, a reinforced concrete stairwell 55 is provided (see Figure 6). The concrete core section 50 and the elevator shaft 35 are constructed to be erected continuously upward from the second floor 22 to the eighth floor 31f, which is the top floor of the upper floor 30, as will be described later (see Figure 3).

[0031] Furthermore, in this embodiment, the floors from the 3rd floor 31a to the 8th floor 31f in the upper floor 30, which is connected to the 2nd floor 22, the top floor of the lower floor 20 of the reinforced concrete structure, are formed as living spaces with multiple private rooms 25, as described above, and have substantially the same floor plan. The floors from the 3rd floor 31a to the 8th floor 31f are a hybrid floor section consisting of multiple floors of a wooden hybrid structure. For example, as shown in Figure 6, the 4th floor 31b has a plan shape that adds one private room 25 on the base end side (west side) in the cantilever direction of the cantilevered floor section 22b to the main floor section 22a of the 2nd floor 22 of the reinforced concrete structure.

[0032] On the 4th floor 31b, which is a wooden hybrid structure, a corridor 32a is provided that crosses the central part in the north-south direction. On the south side of the corridor 32a, for example, six private rooms 33 are provided, connected in the east-west direction and accessible from the corridor 32a, preferably separated by wooden partition walls 32b and partition walls made of gypsum board or the like. On the north side of the corridor 32a, for example, two private rooms 33 are provided in the western part, preferably separated by wooden bracing and partition walls made of gypsum board or the like, and accessible from the corridor 32a. Adjacent to the east of these, similar to the 2nd floor 22, a concrete core section 50 with a rectangular cross-section of reinforced concrete structure is provided, where the elevator shaft 35, which will be described later, is located. Further east of the concrete core section 50, a stairwell 55 of reinforced concrete structure is provided.

[0033] Furthermore, in this embodiment, the upper floors 30, which are formed continuously above the lower floor 20 of the reinforced concrete structure, for example from the 3rd floor 31a to the 8th floor 31f, are preferably a wood-reinforced concrete hybrid structure, combining wood and reinforced concrete (RC) construction, as described above. The upper floors 30 of the wood-reinforced concrete hybrid structure, as shown in Figures 3, 5, and 6, preferably rise from the floor slab 42 of the 2nd floor 22, which is the top floor of the lower floor 20 of the reinforced concrete structure, and are formed continuously in the vertical direction so as to penetrate the upper floors 30 of the wood-reinforced concrete hybrid structure, and include a concrete core portion 50 of a reinforced concrete structure with a rectangular cross-sectional shape. In the upper floor 30, which is a wooden hybrid structure, the ceiling slab 51 and floor slab 52 of each floor 31a to 31f are formed integrally with the concrete core 50, projecting outward from the concrete core 50. Each of the multiple wooden columns 53 is positioned vertically between the ceiling slab 51 and floor slab 52 of each floor 31a to 31f, with the wooden columns 53 of the upper floor 31b to 31f and the wooden columns 53 of the lower floor 31a to 31e being separated at the portion of the floor slab 52 of the upper floor 31b to 31f, which is also the ceiling slab 51 of the lower floor 31a to 31f.

[0034] This makes it possible to transmit horizontal stress to the concrete core 50 via the reinforced concrete ceiling slab 51 and floor slab 52, so that the concrete core 50 bears the horizontal stress.

[0035] Furthermore, in this embodiment, in the upper floor 30 which is a wooden hybrid structure, preferably wooden beams 54a are integrally joined to the ceiling slab 51 and floor slab 52, or concrete beams 54b are integrally formed, and each of the multiple wooden columns 53 is erected and installed between the ceiling slab 51 and floor slab 52 with these wooden beams 54a or concrete beams 54b interposed between them.

[0036] The joints at the top and bottom ends of the wooden column 53 are pin-jointed, which makes it possible to create a structure that does not transmit horizontal stresses in the event of an earthquake, etc., but only transmits vertical loads from the upper floor.

[0037] Furthermore, in this embodiment, in the upper floor 30 which is a wooden hybrid structure, a wooden seismic wall 56 is erected and installed, preferably in the portion between the ceiling slab 51 and the floor slab 52, or with a wooden beam 54a or concrete beam 54b interposed between them.

[0038] This means that a member is provided to bear horizontal stress separately from the concrete core 50, making it possible to reduce the eccentricity (difference between the center of gravity and the center of rigidity) of each floor.

[0039] Furthermore, as described above, in the seismically isolated high-rise building 10 of this embodiment, as shown in Figure 3, a reinforced concrete elevator shaft 35 is provided extending downward to a height reaching the floor slab 21a of the 1st floor 21, which is the lowest floor of the lower floor 20, while being supported at least by the floor slab 42 of the upper floor 22 that forms the intermediate seismic isolation layer 40. In this embodiment, the elevator shaft 35 is preferably supported by the floor slab 42 of the upper floor 22 that forms the intermediate seismic isolation layer 40, and is also positioned inside a concrete core section 50 that is continuously erected upward from the floor slab 42 of the upper floor 22 to the 8th floor 31f, which is the top floor of the upper floor 30. It is then integrally joined to a plurality of floor support slabs 57 that are formed to project inward from the concrete core section 50 on each floor 31a to 31f of the upper floor 30, thereby also being supported by the concrete core section 50. Furthermore, the elevator shaft 35 is positioned to be inserted into the insertion openings 41b, 21b, while maintaining a predetermined distance 41c, 21c between the opening edge of the insertion opening 41b formed in the ceiling slab 41 of the first floor, which is the lower floor and forms the intermediate floor seismic isolation layer 40, and the opening edge of the insertion opening 21b formed in the floor slab 21a of the first floor, which is at least the lower floor, below the insertion opening 41b.

[0040] Furthermore, in the seismically isolated high-rise building 10 of this embodiment, as described above, preferably the floor area of ​​the upper floor 30 made of a wooden hybrid structure is smaller than the floor area of ​​the lower floor 20 made of a reinforced concrete structure, and the upper floor 30 made of a wooden hybrid structure is installed in an off-center position within the planar area of ​​the lower floor 20 made of a reinforced concrete structure, for example, positioned off-center to the west.

[0041] As a result, in the seismically isolated high-rise building 10 of this embodiment, the floor area of ​​the lower floors 20 is large, the floor plan changes at the intermediate floors, and the upper floors 30, which have a smaller floor area, extend in a tower-like shape, resulting in a so-called base-platform shaped building. Therefore, during an earthquake, the acceleration will be greater on the upper floors of the upper floors 30. However, since the upper floors 30 as a whole are made of a wooden hybrid structure which is lighter than a reinforced concrete structure, it is possible to effectively suppress the increase in force during an earthquake, which is obtained by multiplying the acceleration by the weight, and thus it is possible to make the whip-swing phenomenon less likely to occur.

[0042] Furthermore, this improves the degree of freedom when arranging a tower-shaped upper floor 30 with a small floor area within the planar area of ​​the lower floor 20, which has a large floor area. This makes it easier to design the upper floor 30 to avoid sunlight restrictions and setback restrictions, and also enhances the design of the building. Preferably, when the planar area of ​​the lower floor 20 has a rectangular planar shape with long and short sides, the eccentricity ratio due to the eccentricity of the centroid position of the planar area of ​​the upper floor 30 relative to the centroid position of the planar area of ​​the lower floor 20 can be 0 to 35% in the direction of the long side and 0 to 35% in the direction of the short side.

[0043] Furthermore, according to the seismically isolated high-rise building 10 of this embodiment, an intermediate floor seismic isolation layer 40 is provided interposed between the lower floor 21 and the upper floor 22 in the lower floor 20, which is a reinforced concrete structure, and seismic isolation operating parts 43 are provided in multiple locations distributed within the intermediate floor seismic isolation layer 40. Each seismic isolation operating part 43 is composed of a lower concrete base part 41a, an upper concrete base part 42a, and a seismic isolation device 47 sandwiched between them, and the intermediate floor concrete wall 45 of the intermediate floor seismic isolation layer 40, which is erected between the ceiling slab 41 of the lower floor 21 and the floor slab 42 of the upper floor 22, is formed in a state where it is divided vertically by a seismic isolation slit 46.

[0044] This effectively absorbs the horizontal loads applied during an earthquake by moving the reinforced concrete upper floor 22 relative to the reinforced concrete lower floor 21 through an intermediate seismic isolation layer 40 installed between the lower floor 21 and the upper floor 22 of the reinforced concrete lower floor 20, thereby allowing the building to continue to be supported in a stable state. Furthermore, the intermediate seismic isolation layer 40 installed in the middle part of the reinforced concrete lower floor 20 makes it possible to efficiently provide seismic isolation without requiring an underground pit for foundation isolation. In addition, since the intermediate seismic isolation layer 40 can be installed so as to fit within the same planar area as the floors 21 and 22 of the lower floor 20 without protruding outward, it becomes possible to efficiently design the building within the limited site on which the building is constructed without being constrained by extra occupied area due to the seismic isolation layer.

[0045] As a result, according to the reinforced concrete and wooden seismically isolated high-rise building 10 of this embodiment, even in high-rise buildings of six stories or more, including wooden hybrid structures, it is possible to efficiently and effectively provide seismic isolation functionality without base isolation, so that the building can continue to be supported in a stable state during an earthquake. Furthermore, it is possible to efficiently construct a building in which the upper floors 30, which are high-rise sections with a smaller floor area, extend upward from the lower floors 20, which are low-rise sections with a larger floor area.

[0046] It should be noted that the present invention is not limited to the embodiments described above and can be modified in various ways. For example, the lower floor of a reinforced concrete structure does not necessarily have to be a two-story structure consisting of a first floor and a second floor, but may be a lower floor of three or more stories. In this case, the intermediate floor seismic isolation layer does not necessarily have to be provided between the top floor of the lower floor and the lower floors below it, but can be provided between any upper and lower floors in a multi-story structure of three or more stories, for example, between the second floor and the third floor. The upper floor does not necessarily have to be positioned eccentrically to the west within the planar area of ​​the lower floor, but can be positioned eccentrically in an off-center location with other directions as predetermined directions. [Explanation of symbols]

[0047] 10. Seismic isolation high-rise buildings 20 lower level 21 Lower floor (1st floor) 21a Floor slab of floor 21 on the first floor 21b Through opening 21c spacing 22 Upper floor (2nd floor) 22a Main floor area 22b Overhanging floor section 22c Corridor 22d, 22e Partition wall 23 Ceiling slab 25 private rooms 30 Upper layer 31a 3rd floor 31b 4th floor 32a Corridor 32b Partition wall 33 private rooms 35 Elevator shaft 40 Intermediate floor seismic isolation layer 41. Ceiling slab of the lower floor 41a Lower concrete base 41b Through opening 41c spacing 42 Floor slab of the upper floor 42a Upper concrete base 43 Seismic isolation mechanism 44 Ceiling beams 45 Intermediate floor concrete wall 45a outer wall 46 Seismic isolation slits 46a Gap filler 46b Trim 47 Seismic isolation device 48 Floor beam 49 Damper device 50 Concrete core section 51 Ceiling slab 52 Floor slab 53 Wooden pillar 54a wooden beam 54b Concrete beam 55 Staircase 56. Wooden seismic walls 57 Support slab

Claims

1. A reinforced concrete and wooden high-rise building with seismic isolation, comprising a lower floor consisting of multiple floors made of reinforced concrete and an upper floor consisting of multiple floors made of a wooden hybrid structure, In the aforementioned lower floor, which is made of reinforced concrete, an intermediate seismic isolation layer is provided between the lower floor and the upper floor. The intermediate floor seismic isolation layer is provided with seismic isolation operating parts distributed at multiple locations, which support the ceiling slab of the lower floor and the floor slab of the upper floor so that they can move relative to each other in the lateral direction. Each of the aforementioned seismic isolation operating units is composed of a lower concrete base portion that protrudes upward as a whole from the ceiling slab of the lower floor, an upper concrete base portion that protrudes downward as a whole from the floor slab of the upper floor, and a seismic isolation device that is mounted so as to be sandwiched between these concrete base portions. Furthermore, the intermediate floor concrete wall of the intermediate floor seismic isolation layer, including the outer perimeter wall, which is erected between the ceiling slab of the lower floor and the floor slab of the upper floor, is formed in a state where it is divided vertically by seismic isolation slits. A reinforced concrete and wooden high-rise seismically isolated building in which the floor area of ​​the upper floor, which is made of a wooden hybrid structure, is smaller than the floor area of ​​the lower floor, which is made of a reinforced concrete structure, and the upper floor, which is made of a wooden hybrid structure, is erected eccentrically in an off-center position within the planar area of ​​the lower floor, which is made of a reinforced concrete structure.

2. The reinforced concrete and wooden seismically isolated high-rise building according to claim 1, wherein the first floor of the lower level is referred to as the lower floor, the second floor as the upper floor, and the intermediate seismic isolation layer is interposed between them.

3. The lower floor plan area has a rectangular plan shape with long sides and short sides, and the eccentricity ratio due to the eccentricity of the centroid of the upper floor plan area with respect to the centroid of the lower floor plan area is 0 to 35% in the direction of the long side and 0 to 35% in the direction of the short side, as described in claim 1 or 2, for a reinforced concrete and wooden high-rise seismically isolated building.

4. A reinforced concrete and wooden high-rise seismically isolated building according to claim 1 or 2, wherein a reinforced concrete elevator shaft is provided extending downward to a height reaching the floor slab of the lowest floor of the lower floor, with the elevator shaft being supported by the floor slab of the upper floor that forms the intermediate seismic isolation layer, and the elevator shaft is positioned to be inserted into the openings formed in the ceiling slab of the lower floor that forms the intermediate seismic isolation layer, while maintaining a predetermined distance between these openings and the opening edges of the insertion openings formed in the floor slab of at least the lower floor below.

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