JP2016033290A - Base-isolated building - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a building for an apartment house improved so that a column type and a beam type do not project indoors so much, by drastically looking at a structure of a base-isolated story again.MEANS FOR SOLVING THE PROBLEM: A base-isolated building 1 is a building for an apartment house including a base-isolated story of an RC structure supported on base-isolated devices 41 and 43. This building 1 comprises end wall columns 11a and 13a positioned in an end part of the building erected on a base-isolation just above underfloor beam 31 placed on the base-isolated devices and partition wall columns 15-1, 2 and 3 being a part of a door inner partition wall. Since the wall columns do not project indoors so much, a room is used from to the corer to the corner. Balcony side openness (a transparent feeling) is also improved.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a building having a seismic isolation device. In particular, by utilizing the effect of reducing the seismic force in the superstructure on the seismic isolation device, and adding new ideas such as using a part of the interior partition wall of the superstructure as the wall pillar of the RC structure, It relates to a base-isolated building that has been improved so that the mold and beam type do not protrude too much into the room.

  The applicant of this patent application has developed various base-isolated buildings and has obtained several patents (see below) regarding base-isolated buildings.

Japanese Patent No. 396758 Japanese Patent No. 4898207 Japanese Patent No. 4914940

  The present invention drastically reviewed the structure of the seismic isolation floor to fully utilize the seismic force reduction effect of the superstructure obtained by making the building seismic isolation structure, so that the column type and beam type protrude too much into the room. It aims at providing the building for collective housing improved so that there may not be. Thereby, it aims at providing the building for apartment buildings which has the advantage of improving the openness (transparency) by the side of a balcony, or raising a floor-planning freedom degree.

  The seismic isolation building of the present invention is a building for an apartment house including a seismic isolation floor of a reinforced concrete structure (RC structure) supported on the seismic isolation device, both of which are on the seismic isolation device of RC structure. A seismically isolated directly above-underfloor beam; an end wall column located on an end of a building that stands on the above-mentioned seismically isolated directly above-underfloor beam; and a partition wall that stands on the above-mentioned seismically isolated directly above-underfloor beam A column, and a floor beam of each floor connected to the end wall column and / or the partition wall column.

  Here, the “wall column” is a wall that also serves as a column, and the thickness is 250 to 500 mm, which is thinner than 800 mm or 950 mm of a normal column. The wall column receives both a vertical load (axial force) and a horizontal load (such as seismic force). The reinforcing bars arranged in the wall column are both vertical and horizontal hoops (shear reinforcement). On the other hand, a simple “wall” only receives a horizontal load (such as seismic force), and the reinforcing bars are only vertical and horizontal bars.

  In the building of the present invention, by using a part of the interior partition wall as a wall pillar, ordinary pillars that are not wall pillars are eliminated or reduced as much as possible. This eliminates the column shape (the column does not protrude too much from the wall) and allows the room to be used from corner to corner. Moreover, the width of the window on the balcony side can be increased, and the openness (transparency) is also improved.

  Here, the partition wall pillar is specifically a partition wall of an appropriate length such as a wall of a toilet or bathroom, a wall at the back of a range, a back wall of a refrigerator / cupboard installation space, a back wall of a container, etc. It can be a pillar. In this way, the column can be absorbed by the wall without significantly reducing the degree of freedom of the floor plan.

  In the present invention, the floor beam is preferably a flat floor beam. Here, the “flat floor beam” is a floor / beam having a relatively low beam back, and the beam back is 250 to 470 mm, which is lower than 800 mm or 950 mm of a normal beam. The flat floor beam receives both long-term load (vertical force) and seismic load (horizontal force, etc.), and the internal rebar is the stirrup (shear reinforcement) of the horizontal and vertical bars. On the other hand, a simple floor (RC structure floor) only receives a long-term load (such as a vertical force), and a reinforcing bar is only a horizontal bar.

  In this case, the beams do not protrude much from the bottom of the floor (ceiling), so you can use the top and bottom of the room from corner to corner. Moreover, the height of the window on the balcony side is increased, and the openness (transparency) is further improved.

  In the present invention, the end wall column constitutes an end portion of the end wall or door wall, and the partition wall column extends in a direction intersecting the end wall or door wall, and the length of the building It is also preferable that the outer side wall is not an RC structure. Walls not having an RC structure are dry walls, ALC (Autoclaved Lightweight Aerated Concrete), board plus heat insulation and sound insulation materials, and the like. For example, ALC + door / window sash can be used for the outer wall on the corridor side, and front window sash can be used on the balcony side. As a result, the weight of the building can be further improved and the openness on the veranda side can be further improved.

  The direction in which the end wall / door wall extends is generally the short side direction of the building, and the perpendicular direction is the long side direction. The rigidity in the long side direction can be secured by the partition wall column, and the rigidity in the short side direction can be secured by the end wall column.

  ADVANTAGE OF THE INVENTION According to this invention, the room can be used from corner to corner and the building for apartment houses with high utilization efficiency of a living space can be provided. In addition, a building with improved openness (transparency) on the balcony side can be provided. Nevertheless, it does not reduce the degree of freedom in the floor plan.

It is a top view which shows the floor plan etc. of the building (2LDK apartment) which concerns on the 1st Embodiment of this invention. It is a plane sectional view showing composition of RC structure of a seismic isolation upper floor in the building of FIG. FIG. 3 is a front sectional view showing a configuration of an RC structure of the building of FIGS. FIG. 3 is a side sectional view (shaft diagram, X4 section of FIG. 2) showing the configuration of the RC structure of the building of FIGS. It is a plane sectional view showing composition of RC structure of a base isolation floor floor beam and a base isolation bottom floor of the building of FIG. It is a top view which shows the floor plan etc. of the building (2LDK apartment) which concerns on the 2nd Embodiment of this invention. It is a top view which shows the floor plan etc. of the building (1K apartment) which concerns on the 3rd Embodiment of this invention. It is the graph which put together the result of having calculated the layer shear force coefficient Ci of each floor in case various seismic waves act on a 14-story building. It is the graph which put together the result of having calculated the displacement of each floor when various seismic waves act on a 14-story building.

1; building (apartment), 3; exterior corridor, 5; each door (room), 7; balcony 8; elevator, 9;
11; Wife wall, 11a; End wall column, 11b; Wall, 11c; Middle wall column,
13; Door wall, 13a; End wall column, 13b; Wall, 13bx; Simple wall, 13by;
15-1, 2, 3; partition wall columns,
17; Hallway side outer wall, 19; Balcony side outer wall, 21; Interior partition
26a; end flat floor beam, 26b; floor, 26c; inner flat floor beam,
31; Under-floor beam (beam directly above the seismic isolation device), 33; Long-side under-floor beam, 35; Short-side under-floor beam,
37; Underfloor beam for partition wall columns
41; Seismic isolation device (rubber / lead plug bearing), 43; Seismic isolation device (sliding bearing),
61; Unit bath, 63; Toilet, 65; Range
71 ・ 72; Western-style room, 73; Kitchen, 75; LDK

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
First, with reference to FIG. 1, the building which concerns on the 1st Embodiment of this invention is demonstrated. FIG. 1 is a plan view showing a floor plan of a building (2LDK apartment) according to the first embodiment of the present invention.

  As shown in FIG. 1, the building 1 in this example is a so-called condominium in which four 2LDK rooms 5 are arranged on one floor (the leftmost room is not shown). The number of floors is an example assuming the 6th floor and the 10th floor. As a matter of course, the scope of the present invention is not limited by the number of houses or floors per floor. As shown in the upper part of the figure, an outer corridor 3 through which people who come and go to each door 5 pass is provided along the long side of the building 1. An elevator 8 and a staircase 9 are provided on the upper side of the figure of the outer corridor 3.

  In this example, each door 5 is provided with two Western-style rooms of about 6 tatami mats (Western rooms 71 and 72), an LDK 75 of about 12 tatami mats, a bathroom (unit bath) 61, a washroom 62, a toilet 63, and the like. An outer wall 17, a door, a window, and the like are provided on the side of the outer corridor 3 of each door 5. Door 5-2 on the left side of door 5-1 on the far right in the figure is a layout of door 5-1 and right and left (in line symmetry), and door 5-3 on the left is door 5- Same floor plan as 1.

  The opposite side of the outer corridor 3 of each door 5 (the lower side in the figure) is a balcony 7. The boundary between the balcony 7 and the LDK75 / Western-style room 72 is a balcony-side outer wall 19. The balcony-side outer wall 19 is a front window sash in this example. In this example, the corridor-side outer wall 17 is a dry wall made of ALC (a window sash, a door, etc. are attached). Depending on conditions such as the number of floors and floor area of the building 1, a part of the outer wall along the long side of the building 1 may be an RC structure.

  The outermost short side of the building 1, that is, the right side of the room 5-1 in the drawing is a wife wall 11 (the left wall of the building 1 is not shown). A door wall 13 is provided between the rooms 5. The end wall 11 and the boundary wall 13 are slab walls of RC structure, and the ends of some buildings are “wall columns” (walls that also serve as columns, which will be described later with reference to FIG. 2).

  In this building 1, a part of the partition wall in the door is also a wall pillar of RC structure. That is, in the rightmost door 5-1, the partition wall column 15-1 is provided so as to protrude in the long side direction from the end wall 11 on the right side in the figure at the approximately center in the vertical direction in the figure. Yes. This partition wall column 15-1 is a part of the interior partition between the two Western rooms 71 and the Western room 72. The partition wall 21 (shown by a thick solid line) other than these is a dry wall.

  Two rows of partition wall pillars 15-2 and 15-3 are also provided so as to protrude into the room from the left border wall 13-1 of the door 5-1 diagram. The partition wall column 15-2 on the upper side in the figure is a partition between the bathroom 61 and the kitchen 73. A partition wall column 15-3 on the lower side of the figure is a partition between the kitchen 73 and the LDK 75, and is a wall on the back side of the range 65. As described above, the door 5-2 adjacent to the door 5-1 has a floor layout and partition wall column arrangement that are different from the door 5-1 on the left and right sides (line symmetry).

Here, the structure of the RC structure of the seismic isolation upper floor in the building of FIG. 1 will be described. FIG. 2 is a plan sectional view (shaft diagram) showing the configuration of the RC structure on the upper floor of the building of FIG. FIG. 3 is a front sectional view showing the configuration of the RC structure in the building of FIGS. 1 and 2 (Y1a section of FIG. 2, shaft assembly diagram). 4 is a side sectional view showing the configuration of the RC structure in the building of FIGS. 1 and 2 (X4 in FIG. 2).
Cross section, shaft assembly diagram). FIG. 5 is a plan sectional view (shaft diagram) showing the configuration of the RC structure of the base isolation floor floor beam and the base isolation bottom floor of the building of FIG.

  At the right end of FIG. 2, a wife wall 11 extending in the vertical direction (short side direction) of the figure is shown, and on the left side thereof, the door wall 13-1 and the door wall 13 extending in the vertical direction of the figure are also shown. -2 is shown.

  The end wall 11 extends along the short side of the building 1 in FIG. 2 from the top (outer corridor 3) to the bottom (balcony 7) in the figure, and includes an end wall column 11a, a wall 11b, a middle wall column 11c, a wall 11b, the end of the partition wall column 15-1, the wall 11b, and the end wall column 11a are connected. Among these, the end wall pillar 11a, the middle wall pillar 11c, and the partition wall pillar 15-1 are “wall pillars” as architectural terms that serve as both walls and pillars. The “wall column” can withstand both vertical load (axial force) and horizontal load (earthquake force, etc.). The reinforcing bars arranged in the wall column are vertical and horizontal hoops (shear reinforcement).

  On the other hand, the wall 11b is similar to the wall 13b of the doorway wall 13 shown in the side view of FIG. 4, and the under floor wall beam 13by extending in the short side direction along the bottom of the ceiling (the floor 26 of the upper floor), It is connected to a simple wall 13bx that spreads out. The underfloor wall beam 13by is structurally designed to withstand vertical loads and horizontal loads. The reinforcing bars disposed in the underfloor wall beam 13by are horizontal and vertical stirrup bars (shear reinforcement bars). The simple wall 13bx is structurally designed to withstand only a horizontal load (such as seismic force). The reinforcing bars arranged in the mere wall 13bx are only vertical and horizontal bars.

  In the case of this building 1, the middle wall pillars 11 c and 13 c are placed in the middle part of the wall 11 and the door wall 13-2 in the middle in the long side direction, slightly closer to the corridor 3. The middle wall columns 11c and 13c are intended to compensate for the strength of the portion where the partition wall column 15 is small. The wall 13-1 between the rightmost door 5-1 and the adjacent door 5-2 in the figure has end wall pillars 11a at both ends in the short side direction. 11c is not provided. This is because two rows of partition wall columns 15-2 and 15-3 are provided on the left and right sides of the same boundary wall 13-1, and the strength is sufficient. There is usually no structural difference between the end wall columns 11a and 13a and the middle wall columns 11c and 13c. However, the column shape may be different due to the end reinforcement.

  The border wall 13-1 between the rightmost door 5-1 and the adjacent door 5-2 is located along the short side of the building 1 from the top (outer corridor 3) to the bottom (balcony). 7) Toward the end wall column 13a, the wall 13b, the center of the partition wall column 15-2, the wall 13b, the center of the partition wall column 15-3, the wall 13b, the end wall column 13a are connected. ing. The border wall 13-2 in the middle of the long side is from the top of the figure (outer corridor 3) to the bottom of the figure (balcony 7), end wall pillar 13a, wall 13b, wall pillar 13c, wall 13b, partition wall The central portion of the column 15-1, the wall 13b, and the end wall column 13a are connected. The structure and action of each wall column and each wall are the same as those of the wife wall 11.

  Next, the floor structure of the building 1 will be described. The floor of each door is from the top of FIG. 2 (outer corridor 3) to the bottom of the figure (balcony 7). The floor 26b and the end flat floor beam 26a are connected. Here, each flat floor beam is a relatively flat floor structure that serves as both a floor and an underfloor (upper) beam. Flat floor beams withstand vertical and horizontal loads. The reinforcing bars arranged in the flat floor beam are horizontal and vertical stirrup bars (shear reinforcement bars). On the other hand, the floor 26b is structurally designed to withstand only a vertical load. The reinforcing bars arranged in the floor 26b are only horizontal bars.

  The end flat floor beam 26a is connected to the end wall column 11a, and the inner flat floor beam 26c is connected to the partition wall column 15 and the middle wall column 11c.

Here, the normal range of thickness of each part and an example (example of the building of FIGS. 1-5, the number of floors in parentheses) will be introduced.
End wall pillars 11a and 13a thickness: 250mm
Partition wall column 15 thickness: 250-450mm, 250mm (6th floor), 250mm (10th floor),
450mm (14th floor)
Thickness of middle wall columns 11c and 13c; 250mm
Thickness of mere wall 13bx; 200mm (200mm + 50mm flock)
Thickness of under floor beam 13by; 250mm
End flat floor beam 26a thickness: 250-320mm, 250mm (6th floor), 270mm (10th floor)
320mm (14th floor)
Floor 26b thickness; 250mm
Thickness of inner flat floor beam 26c; 250-370mm, 270mm (6th floor), 320mm (10th floor)
370mm (14th floor)
Beam back of under-floor beam 11by; 550-600mm (frame beam)

  Thus, in the building of FIG. 1, “the thickness of the end wall column ≧ the thickness of the partition wall column”. The reason for this is to fix the end beam reinforcement.

  In addition, “the thickness of the end flat floor beam ≧ the thickness of the inner flat floor beam”. This is because the distribution ratio of seismic force is different.

  In this building 1 (about 7th floor or less), the end wall columns 11a and 13a, the walls 11b and 13b, and the middle wall columns 11c and 13c end wall columns of the end wall 11 or the boundary wall 13 have the same thickness of 250 mm. . By doing in this way, the concrete placement formwork of the end wall 11 or the doorway wall 13 can be made to have no step, and the formwork shape becomes simple and the formwork work cost is reduced.

  In the case of a building of about 5 floors or less, the end flat floor beam 26a, the floor 26b, and the inner flat floor beam 26c can have the same thickness (250 mm). In this case as well, the level difference of the formwork for placing concrete on the floor can be eliminated, and the work cost for the formwork can be reduced.

The length of each partition wall column 15 in the building 1 of FIG. 1 is 1.8 m for the wall column 15-1, 1.8 m for the wall column 15-2, and 1 m for the wall 15-3, for a total of 4.6 m. The length is a length from the core of the wife wall 11 or the door wall 13. The area of each house 5 of this building 1 (wall core calculation) is 55 square meters. The length of the partition wall column is 0.84m per 10 square meters of area of each door.
The partition wall 21 other than the partition wall column 15 described above is a dry wall.

With reference mainly to FIG. 5, the seismic isolation directly above-underfloor beam 31 will be described. FIG. 5 is a plan sectional view (shaft diagram) showing the structure of the base isolation floor floor beam and the base isolation bottom floor of the building of FIGS.
The seismic isolation directly upper and lower floor beams 31 are RC structures, and in this example, they are installed under the floor of the first floor. It may be installed under the floor of the floor). This underfloor beam 31 is placed on the seismic isolation devices 41 and 43. The underfloor beam 31 is configured by arranging underfloor beams 33 and 37 extending in the long side direction and underfloor beam 35 extending in the short side direction in a lattice pattern.

  The long side underfloor beam 33 extends in the long side direction of the building 1 along the outer wall 17 (see FIGS. 2 and 1) on the outer corridor 3 side of the building 1 and the outer wall 19 on the balcony 7 side. ing. In the building 1 of this example, both the outer walls 17 and 19 are dry walls or sashes, but the long side underfloor beam 33 below has an RC structure. This is to increase the rigidity of the underfloor beam 31.

  Two rows of underfloor beams 37 corresponding to the partition wall pillars 15 extending in the long side direction are also provided at the center of the short side of the underfloor beam 31. These underfloor beams 37 are located under the partition wall column 15 described above. As described above, the partition wall column 15 is provided only in a part of the long side direction of the building, but the corresponding underfloor beam 37 is provided without a break so as to penetrate the long side direction of the building. This is to increase the rigidity of the underfloor beam 31.

  The underside beam 35 in the short side direction is provided below the end wall 11 and below the door wall 13.

   The height of the underfloor beam (large beam on the seismic isolation device) 31 is 1300 mm in this example (seventh floor).

  The seismic isolation devices 41 and 43 are arranged at the four corners of the building 1 and at both ends of the door wall 13. The four corners of the seismic isolation device 41 is a so-called restoration bearing of a laminated rubber type containing a lead plug. The seismic isolation devices 43 at both ends of the door wall 13 are roller-type sliding bearings. These seismic isolation devices 41 and 43 are placed on a foundation (not shown). The floor 39 on the first floor is stretched on the underfloor beam 31 and has a thickness of 200 mm.

The building of this embodiment has the following advantages.
A) Since the columns and beams do not protrude so much from the walls and ceiling, the room can be used from corner to corner. Moreover, the outer wall 19 on the balcony side can be made a wide sash, and the openness (transparency) is improved. In a normal apartment equivalent to this embodiment, the pillar is about 800 mm square, the beam is about 800 mm, and the indoor protrusion is about 300 mm and 600 mm, respectively. Reducing this bulge has the effect of improving the usability of the room and expanding the window area.

B) Since the partition wall column 15 only needs to be provided in a part of the room, the degree of freedom in floor plan is hardly hindered.

FIG. 6 is a partial plan view of a building 101 (2LDK apartment) according to the second embodiment. The reference numerals in the figure are those obtained by adding 100 to the reference numerals in FIG.
In this building 101, a partition wall column 15-3 is provided between the western room 121 and the kitchen 129 shown in the upper left of the figure so as to protrude rightward in the figure from the end wall 111 shown in the left of the figure. Yes. A partition wall column 115-4 is also provided on the back wall of the range stand 130 of the kitchen 129. Further, a partition wall column 115-1 is provided between the washroom 121 and the toilet 124 so as to protrude from the doorway wall 113-1 shown on the right side of the drawing in the left direction of the drawing. A partition wall column 115-2 is also provided between the walk-in closet 126 and the Western-style room 137.

  The thickness of each partition wall column is 250 mm for the 6th floor building, 250 mm (10th floor), and 450 mm for the 14th floor building. The total length of the partition wall columns is 5.85m per room (floor area is 50 square meters). The length of the partition wall column is about 0.6m per 10 square meters of area of each door. Note that the length of the partition wall column 115-3 substantially corresponds to the length of the cupboard storage 128 of the kitchen 129. Next to the cupboard storage 128 is a refrigerator storage 127, but the depth of the refrigerator storage 127 is deeper. The end of the partition wall column 115-3 is positioned at the level difference between the cupboard storage 128 and the refrigerator storage 127.

  In this example, there are two wall pillars 115-3 and 4 at the central part in the short side direction of the end wall 111, and therefore the middle wall column 11c of the end wall 11 as in the example of FIG. 2 is not provided.

FIG. 7 is a partial plan view of a building 201 (one-room apartment) according to the third embodiment. The reference numerals in the figure are obtained by adding 200 to the reference numerals in FIG.
In this building 201, a room between two adjacent rooms 205-1 and 205-2 is a dry partition wall 214. And the partition wall 213 of RC structure is provided every two chambers. A partition wall column 215-1 is provided between the bathroom 221 and the toilet 223. Further, a partition wall column 215-2 is also provided between the walk-in closet 224 and the Western-style room 217. The thickness of each partition wall column is 250mm (6th floor), 250mm (10th floor), and 450mm for the 14th floor building. The total length of the partition wall pillars is 5.8m per two rooms (floor area is 50 square meters for two rooms). The length of the partition wall column is 0.58m per 10 square meters of area of each door.

  In the case of a 6-10 floor apartment near Tokyo, if the partition wall pillar length is about 0.5-0.8m per 10 square meters of each door area, it will have sufficient earthquake resistance, but it is a thick pillar with conventional RC structure. A building without any space can be realized.

Next, calculation results of building responses to various seismic waves in a 14-story building (floors / shaft diagrams, etc. are shown in FIGS. 1 to 5 and the thickness of each part is as described above) are explained with reference to graphs. To do.
FIG. 8 is a graph summarizing the results of calculating the layer shear force coefficient Ci of each floor when various seismic waves act on a 14-story building. The horizontal axis represents the layer shear force coefficient Ci of each floor, and the vertical axis represents the number of floors.

  Each seismic wave is a waveform that models an earthquake assumed in the coastal area of the Kanto region. The seismic wave A in the white circle plot is “6T3KKJ ElcenNSp nLs”, and the seismic wave B in the black circle plot is “6T3SITE TBN NS nL”. The seismic wave C in the plot is “SS2 HachiNSp nLs”. A thick solid line in the graph indicates a design limit value, and a thick broken line indicates an elastic limit. As can be seen from the graph, in the building of the embodiment of the present invention, the layer shear force coefficient Ci is less than the design limit value and the elastic limit on each floor, and it can be seen that the building is sufficiently resistant to earthquakes.

FIG. 9 is a graph summarizing the results of calculating the displacement of each floor when various seismic waves act on a 14-story building. The horizontal axis is the displacement of each floor, and the vertical axis is the number of floors (the 15th floor is the roof). Each seismic wave is the same as in FIG. As can be seen from the graph, the building of the embodiment of the present invention has a displacement of less than 500 mm, which is the design limit value, on each floor.
It can be seen that the earthquake resistance is sufficient.

Claims (8)

A building for an apartment building including a seismic isolation floor of a reinforced concrete structure (RC structure) supported on a seismic isolation device,
Both of the RC structure,
A seismic isolation floor floor beam placed on the seismic isolation device;
An end wall column located on the end of the building, which is erected directly above the seismic isolation floor floor beam;
A partition wall column that is erected on the above-mentioned seismic isolation directly above the lower floor beam;
Floor beams on each floor connected to the end wall columns and / or the partition wall columns;
A building characterized by comprising.   The building according to claim 1, wherein the floor beam is a flat floor beam. The end wall column constitutes the end of the wife wall or the door wall,
The partition wall pillar extends in a direction intersecting with the end wall or door wall,
The building according to claim 1 or 2, wherein the long side outer wall of the building is not an RC structure.   The building according to any one of claims 1 to 3, wherein the end wall column and the other portions of the end wall or door wall have the same thickness. As the flat floor beam,
An end flat floor beam connected to the end wall column;
An inner flat floor beam connected to the partition wall pillar;
The building according to any one of claims 1 to 4, characterized by comprising: The thickness of the end wall column ≧ the thickness of the partition wall column,
The building according to claim 1, wherein the thickness of the end flat floor beam is equal to or greater than the thickness of the inner flat floor beam. The floor of the building consists of the flat floor beam and the floor,
The building according to any one of claims 1 to 6, wherein the flat floor beam and the floor have the same thickness. The seismic isolation direct upper floor beam comprises a long side floor beam extending in the long side direction of the building, and a short side floor beam extending in the short side direction of the building,
The building according to claim 3, wherein the long-side floor beam is provided also under the long-side outer wall.

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