JP2010275834A - Floor structure, building, and floor structure repairing method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide floor structure, a building, and a floor structure repairing method, capable of enhancing the earthquake-proofness of the building without impairing habitability. <P>SOLUTION: This floor structure 16 includes the first floor slab 21 and the second floor slab 22. The first floor slab is formed of concrete, and the second floor slab 22 has a density lower than that of the first floor slab. The plurality of first floor slabs are arranged to transmit a shearing force to an earthquake-proof member 24 provided in the building 14, attaining a light-weighted floor structure 16. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a floor structure that forms a floor surface by arranging a plurality of floor slabs, a building having the floor structure, and a floor structure repairing method for repairing the floor structure.

  In structural design of buildings, the horizontal strength of each layer is higher than the minimum required strength of the building to resist the seismic force acting on each layer of the building (hereinafter referred to as “required horizontal strength”). Enlarged to ensure the earthquake resistance of the building. Therefore, in order to increase the earthquake resistance of the building, it is necessary to reduce the required horizontal strength or increase the horizontal strength.

  As a technology for increasing the seismic resistance of buildings by reducing the required horizontal proof strength, seismic isolation structures that install seismic isolation devices such as laminated rubber bearings on the seismic isolation layer of buildings are common. The seismic isolation structure is a technology that can be applied to new and renovated buildings. For example, Patent Document 1 installs seismic isolation means that can install seismic isolation devices without interfering with the use of upper floors. An apparatus is disclosed.

  In addition, as a technique for enhancing the seismic resistance of a building by increasing the retained horizontal proof stress, a method of reinforcing the frame structure by providing braces and earthquake-resistant walls is widely used. In particular, the brace reinforcement method is relatively inexpensive because it does not require an expensive device (base isolation device) like the base isolation structure, and it is not necessary to construct a space (base isolation pit) for installing the device. The earthquake resistance of the building can be improved at a cost.

  As shown in FIG. 10, in the seismic reinforcement steel brace expansion method disclosed in Patent Document 2, a steel brace having a peripheral frame 304 in a plane (opening) of a frame constituted by column beam frames 300 and 302 of an existing building. 306 is provided. An adhesive is injected into a gap 308 formed between the peripheral frame 304 and the column beam frames 300 and 302. In this way, the column beam frames 300 and 302 are reinforced by the steel brace 306 having the peripheral frame 304, and the seismic strength of the existing building can be increased.

  However, as disclosed in Patent Document 2, in the reinforcing method using braces, since the braces are provided in the openings surrounded by the pillars and beams, the flow line is blocked, and the design is deteriorated. There is concern about the loss of sex.

JP 2000-170394 A Japanese Patent Laid-Open No. 11-71906

  This invention considers the fact which concerns, and makes it a subject to provide the floor structure which can improve the earthquake resistance of a building, without impairing habitability, a building, and a floor structure repair method.

  The invention according to claim 1 includes a first floor slab formed of concrete, and a second floor slab that forms a floor surface with the first floor slab and has a lower density than the first floor slab. A plurality of the first floor slabs are arranged so that a shearing force in the floor slab surface is transmitted to an earthquake-resistant member provided in the building.

In the first aspect of the invention, the floor structure has a first floor slab and a second floor slab. The first floor slab and the second floor slab constitute a floor surface. The first floor slab is formed of concrete, and the second floor slab is less dense than the first floor slab.
Moreover, the 1st floor slab is arranged in multiple numbers so that the shearing force in a floor slab surface may be transmitted to the earthquake-resistant member provided in the building.

  Therefore, the floor structure can be reduced in weight by arranging the second floor slab having a density lower than that of the first floor slab. Thereby, the weight reduction of the building which has this floor structure can be achieved. Here, for example, when the layer between the nth floor and the n + 1th floor is n layers, the required horizontal proof stress of the n layer is the total shear weight of the layers above the n layer and n. It is determined by multiplying the total weight of the layers. Therefore, the required holding | maintenance horizontal proof stress of n layer can be made small by aiming at weight reduction of a building. Thereby, the earthquake resistance of a building can be improved.

In addition, since the floor structure is reduced by placing a lightweight floor slab (second floor slab) at the position where the floor slab is present in the conventional floor structure, the floor structure can be reduced without reducing the floor area. Can be planned. Moreover, like the reinforcing method which provides a brace in an opening part, a flow line is interrupted | blocked or designability falls and habitability is not impaired.
Thereby, the seismic resistance of the building can be improved without impairing the habitability.

  Moreover, the rigid floor assumption is ensured in the entire floor structure by arranging a plurality of first floor slabs so that the shearing force in the floor slab surface is transmitted to the seismic resistant member. This rigid floor assumption is a calculation assumption that “in-plane deformation does not occur in the floor slab”, which is a premise of design in normal building structure design. This is also an important condition for ensuring earthquake resistance.

  According to a second aspect of the present invention, the second floor slab includes a core portion that is a core material, and a metal lower plate provided on a lower surface of the core portion.

In the invention described in claim 2, the second floor slab has a core portion which is a core material and a metal lower plate. The lower plate is provided on the lower surface of the core portion.
Therefore, when a bending load is applied to the second floor slab, a tensile force is generated at the lower portion of the second floor slab. And when a metal lower plate resists these forces, predetermined out-of-plane rigidity can be obtained.

Further, since the metal lower plate has high strength and rigidity, the metal lower plate can be thinned, whereby the second floor slab can be lightened.
In addition, since a metal lower plate is present against a vertical load acting on the second floor slab, creep deformation which is a problem in a general reinforced concrete floor slab does not occur.

  The invention according to claim 3 is a building having the floor structure according to claim 1 or 2.

  In invention of Claim 3, the building which has a floor structure which can improve the earthquake resistance of a building without spoiling habitability can be constructed | assembled.

  According to a fourth aspect of the present invention, there is provided a floor structure repairing method for repairing a floor structure constituting a floor surface by arranging a plurality of first floor slabs formed of concrete, and the floor to an earthquake-resistant member provided in a building. The first floor slab other than the first floor slab in the minimum necessary position for transmitting the shearing force in the plate surface is replaced with a second floor slab having a density lower than that of the first floor slab.

  According to a fourth aspect of the present invention, in the floor structure repairing method for repairing the floor structure, the floor structure is reduced in weight by replacing the first floor slab with a second floor slab having a lower density than the first floor slab. Since it becomes possible to plan, the earthquake resistance of the building which has this floor structure can be improved.

Further, since the floor structure can be lightened by arranging the lightweight second floor slab at the position where the first floor slab is present before renovation, the floor structure can be lightened without reducing the floor area. . Moreover, like the reinforcing method which provides a brace in an opening part, a flow line is interrupted | blocked or designability falls and habitability is not impaired.
By these, repair which improves the earthquake resistance of a building can be performed without impairing habitability.

  Since this invention was set as the said structure, the floor structure which can improve the earthquake resistance of a building, without impairing a habitability, a building, and a floor structure repair method can be provided.

It is an elevational view showing a building according to the first embodiment of the present invention. It is a top view showing the floor structure concerning a 1st embodiment of the present invention. It is a side view showing the 2nd floor slab concerning a 1st embodiment of the present invention. It is a side view which shows the modification of the 2nd floor slab which concerns on the 1st Embodiment of this invention. It is a side view which shows the modification of the 2nd floor slab which concerns on the 1st Embodiment of this invention. It is a side view which shows the modification of the 2nd floor slab which concerns on the 1st Embodiment of this invention. It is explanatory drawing which shows the application example of the floor structure repair method which concerns on the 2nd Embodiment of this invention. It is explanatory drawing which shows the application example of the floor structure repair method which concerns on the 2nd Embodiment of this invention. It is explanatory drawing which shows the application example of the floor structure repair method which concerns on the 2nd Embodiment of this invention. It is explanatory drawing which shows the conventional steel brace expansion construction method of earthquake-proof reinforcement.

The floor structure, building, and floor structure repair method of the present invention will be described with reference to the drawings. In this embodiment, an example in which the present invention is applied to a steel structure building is shown. However, a reinforced concrete structure, a steel reinforced concrete structure, a CFT structure (Concrete-Filled Steel Tube), and a mixed structure thereof. It can be applied to buildings of various structures and scales.
Moreover, in this embodiment, although the term of a core part and a core wall is used, a core part means the core material of a 2nd floor slab, and the core wall is shown as an example of an earthquake-resistant member.

  First, a first embodiment of the present invention will be described.

  As shown in the elevation view of FIG. 1, a steel building 14 is supported on a pile 12 embedded in the ground 10. The building 14 is a new building of 8 stories (8 layers), and a floor structure 16 is constructed on the floor of each floor.

  As shown in the plan view of FIG. 2A, the floor structure 16 has a first region 18 and a second region 20. A plurality of first floor slabs are arranged in the first area 18, and a plurality of second floor slabs 22 (see FIG. 3) are arranged in the second area 20. That is, the floor structure 16 has a first floor slab and a second floor slab 22, and the floor surface of each floor is constituted by the first floor slab and the second floor slab 22. Moreover, the core wall 24 as an earthquake-resistant member is arrange | positioned as a center core in the approximate center of the building 14 by planar view.

  The first floor slab is a general reinforced concrete floor slab formed of ordinary concrete (specific gravity is about 2.3), and is used as a one-way slab that forms part of the floor structure 16 of the building 14. The A plurality of first floor slabs are arranged so that the shearing force in the floor slab surface is transmitted to the core wall 24.

  As shown in the side view of FIG. 3, the second floor slab 22 is constructed on two H-shaped steels 26, 28 arranged opposite to each other, and constitutes a part of the floor structure 16 of the building 14. Used as a direction slab.

  The second floor slab 22 includes a metal lower plate 30 that has a downwardly convex shape, a core portion 32 that is a core material, and a metal upper plate 34 that is disposed above the lower plate 30. The core portion 32 is formed of lightweight cellular concrete U that is placed between the lower plate 30 and the upper plate 34 and hardened, and constitutes the main body of the second floor slab 22. In the state of FIG. 3, the lower plate 30, the core portion 32, and the upper plate 34 are integrated. For the lower plate 30 and the upper plate 34, it is preferable to use plain steel or stainless steel.

On the outer periphery of the second floor slab 22, two C-shaped steel members 36 and 38 as peripheral frames are disposed at a distance approximately parallel to each other in plan view.
Both ends of the lower plate 30 are fixed to the lower surfaces of the C-shaped steel materials 36 and 38, and both ends of the upper plate 34 are fixed to the upper surfaces of the C-shaped steel materials 36 and 38, respectively, by joining means such as seam welding.

An upper end portion of a rib 40 as a buckling prevention means for preventing buckling of the upper plate 34 is fixed to a lower surface of the upper plate 34. The rib 40 is formed of a thin metal plate. In addition, a plurality of ribs 40 are arranged substantially in parallel with the material axes of the C-shaped steel materials 36 and 38 at intervals, and both end portions thereof reach the side surface of the second floor slab 22.
Due to such a configuration of the second floor slab 22, the density of the second floor slab 22 is smaller than that of the first floor slab.

  Next, the operation and effect of the first embodiment of the present invention will be described.

  In the floor structure 16 of the first embodiment, as shown in FIG. 2A, the floor structure 16 can be reduced in weight by arranging the second floor slab 22 having a density lower than that of the first floor slab. it can. Thereby, the weight reduction of the building 14 which has this floor structure 16 can be achieved.

  Here, for example, when the layer between the nth floor and the n + 1th floor is n layers, the required horizontal proof stress of the n layer is the total shear weight of the layers above the n layer and n. It is determined by multiplying the total weight of the layers. Therefore, by reducing the weight of the building 14, the required horizontal proof stress of the n layer can be reduced. Thereby, the earthquake resistance of the building 14 can be improved.

Further, since the floor structure is lightened by arranging a light floor slab (second floor slab 22) at the position where the floor slab is present in the conventional floor structure, the floor structure is lightened without reducing the floor area. Can be achieved. Moreover, like the reinforcing method which provides a brace in an opening part, a flow line is interrupted | blocked or designability falls and habitability is not impaired.
Thereby, the seismic resistance of the building 14 can be improved without impairing the habitability.

  Further, by arranging a plurality of the first floor slabs so that the shearing force in the floor slab surface is transmitted to the core wall 24, the rigid floor assumption is guaranteed in the entire floor structure 16. This rigid floor assumption is a calculation assumption that “in-plane deformation does not occur in the floor slab”, which is a premise of design in normal building structure design. This is also an important condition for ensuring earthquake resistance.

  As shown in FIG. 3, the second floor slab 22 constitutes a sandwich structure in which the lower plate 30, the core portion 32, and the upper plate 34 are integrated. When a bending load is applied to the second floor slab 22 having this sandwich structure, a compressive force is generated at the upper part of the second floor slab 22 and a tensile force is generated at the lower part of the second floor slab 22. A predetermined out-of-plane rigidity can be obtained by mainly resisting the lower plate 30 and the upper plate 34 against these forces.

Further, due to the sandwich structure, the secondary moment of section composed of the lower plate 30 and the upper plate 34 is much larger than a value obtained by simply adding the single sectional secondary moments of the lower plate 30 and the upper plate 34. Thereby, the second floor slab 22 can efficiently obtain a large out-of-plane rigidity.
And it becomes possible to reduce floor vibration by ensuring large out-of-plane rigidity, and thereby, comfort can be improved.

Further, since the metal lower plate 30 and the upper plate 34 have high strength and rigidity, the lower plate 30 and the upper plate 34 can be made thin. Thereby, the 2nd floor slab 22 can be lightened.
Moreover, since the metal lower plate 30 exists with respect to the vertical load which acts on the 2nd floor slab 22, the creep deformation which is a problem in the general reinforced concrete system slab does not generate | occur | produce.

  Further, by forming the core portion 32 from the lightweight cellular concrete U, it is possible to easily ensure the shear rigidity normally required for the core portion 32. Thereby, while reducing the weight of the 2nd floor slab 22, predetermined out-of-plane rigidity can be obtained.

  Further, when a bending load acts on the second floor slab 22, a tensile force that pulls up both ends of the lower plate 30 obliquely upward is generated on the lower plate 30 that is convex downward. And the effect which pushes up the 2nd floor slab 22 whole upwards with the tensile force which generate | occur | produces in the lower board 30 arises, and the bending load produced in the 2nd floor slab 22 is reduced.

  With such a principle, the bending load generated in the second floor slab 22 is reduced, so that the stress generated in the second floor slab 22 is reduced, and the amount of bending of the second floor slab 22 can be reduced. it can. Further, the shear strength required for the core portion 32 and the buckling strength required for the upper plate 34 can be reduced. For example, a material having a low shear strength can be used as the material forming the core portion 32.

  Moreover, since the tensile rigidity of the lower plate 30 having a downwardly convex shape greatly contributes to the out-of-plane rigidity of the second floor slab 22, the out-of-plane rigidity of the second floor slab 22 can be effectively improved.

  In addition, by providing the ribs 40, it is possible to prevent the upper plate 34 from being compressed and buckled when a compressive force is generated in the upper part of the second floor slab 22. Therefore, the upper plate 34 having a small plate thickness can bear the compressive force.

  The buckling prevention means may be any method that can prevent compression buckling of the upper plate provided on the upper surface of the floor slab, and a method for enhancing the integration of the upper surface of the core portion 32 and the upper plate 34. It may be used. For example, a buckling prevention means may be provided on the lower surface of the upper plate 34 and may be a protruding member (stud, embossing, etc.) that enhances the integration between the lower surface of the upper plate 34 and the upper surface of the core portion 32, or an adhesive. Thus, the integration of the core portion 32 and the upper plate 34 may be enhanced. As the adhesive, an epoxy resin, silicone resin, polyamide adhesive, or the like can be used.

  The first embodiment of the present invention has been described above.

  In the first embodiment, an example of the floor structure 16 in which a plurality of first floor slabs and second floor slabs 22 are arranged side by side in the layout shown in FIG. 2A is shown. It is sufficient that a plurality of first floor slabs are arranged side by side so that the shearing force is transmitted. For example, a plurality of first floor slabs and second floor slabs 22 may be arranged side by side in the layout shown in the plan views of FIGS.

  FIG. 2B shows an example of a floor structure 44 in which two core walls 42 provided in a building are arranged as side cores and have a large floor area, and FIG. An example of a floor structure 48 is shown in which two core walls 46 provided on the object are arranged as side cores and have a small floor area. Thus, the arrangement of the seismic members can take various forms. For example, there are cases in which one core wall as a side core is provided, or the core wall surrounds the outer periphery of the floor. The layout of the first floor slab and the second floor slab 22 may be determined so that the shearing force in the floor slab surface is transmitted to the core wall.

  Further, the second floor slab 22 shown in the first embodiment may be a floor slab having any configuration as long as the density is lower than that of the first floor slab. For example, floor slabs 50, 52, 54, 56, and 58 as shown in FIGS. 4 (a) to 4 (c) and FIGS.

  In the side view of FIG. 4A, a downwardly sharp mountain-shaped lower plate 60 is shown, and in the side view of FIG. 4B, a trapezoidal lower plate 62 that protrudes downward is shown. The lower plate 64 of a flat plate is shown in the side view of 4 (c).

  The second floor slab 22 and the floor slabs 50, 52, and 54 may be devised to improve out-of-plane rigidity. For example, as in the floor slab 56 shown in the side view of FIG. 5, the reinforcing bars 68 may be disposed inside the floor slab 56 (core portion 32) so as to have a downward convex shape in the support span direction 66. Alternatively, the ribs 40 may be provided so that the lower ends of the reinforcing bars 68 are in contact with each other. For example, as a device for improving the rigidity in the floor slab surface, an X-shaped reinforcing plate (not shown) may be provided on the lower surface of the upper plate of the floor slab in plan view. Further, a hollow portion (hollow portion 70 in FIG. 5) may be formed inside the floor slab to further reduce the weight of the floor slab.

  As shown in the side view of FIG. 6, the floor slab 58 is attached to the peripheral frame frame 76 with a concrete floor portion 72 that constitutes the upper portion of the floor plate 58 and a metal lower plate 74 that constitutes the lower surface of the floor plate 58. It has been. The sealed space formed by the concrete floor portion 72, the lower plate 74, and the peripheral frame frame 76 is filled with the foamed resin V. That is, the core portion of the floor board 58 is constituted by the concrete floor portion 72 and the foamed resin V.

  In the case of a floor slab having a core portion and a metal lower plate, such as the second floor slab 22 and the floor slabs 50, 52, 54, 56, 58, The lower plate made of metal resists the tensile force generated in the lower portion and can obtain a predetermined out-of-plane rigidity, which is preferable.

  Further, in the first embodiment, the example in which the floor structure 16 is configured by the first floor slab and the second floor slab 22 that are one-way slabs is shown. However, the first floor slab and the second floor slab are formed by two-way slabs. It is good.

  Moreover, although the example which formed the core part 32 of the 2nd floor slab 22 with the lightweight cellular concrete U was shown in 1st Embodiment, the material which forms the core part 32 of the 2nd floor slab 22 is normal concrete ( Any material having a density smaller than the specific gravity of about 2.3) may be used. For example, the core portion 32 may be formed of lightweight concrete or foamable resin.

  Further, in the first embodiment, the example in which the earthquake-resistant member is the core wall 24 is shown, but the earthquake-resistant member resists the horizontal force (seismic force, wind load) generated in the building, and the horizontal force is transmitted to the ground. It can be any member that can be transmitted and placed on a vertical surface, and constitutes a seismic wall, multi-story seismic wall (for example, a staircase wall, an elevator shaft, a core wall such as a doorway wall), or a ramen frame It may be a pillar or brace.

  Next, a second embodiment of the present invention and its operation and effect will be described.

In the description of the second embodiment, the same components as those in the first embodiment are denoted by the same reference numerals and are appropriately omitted.
In the second embodiment, all the floor slabs arranged side by side in the first region 18 and the second region 20 of the floor structure 16 (see FIG. 2A) of the first embodiment are all on the first floor. A floor structure repair method for repairing a floor structure (hereinafter referred to as “floor structure before repair”) as a plate will be described.

  In the floor structure repair method according to the second embodiment, the first floor slab other than the first floor slab located at the minimum necessary position for transmitting the shearing force in the floor slab surface to the core wall 24 provided in the building. Is replaced with a second floor slab 22 having a density lower than that of the first floor slab.

  Therefore, it is possible to reduce the weight of the floor structure before the repair by replacing the first floor slab with the second floor slab 22 having a density lower than that of the first floor slab, so that the floor structure has a repaired floor structure. It can improve the earthquake resistance of buildings.

In addition, since the lightweight second floor slab 22 is arranged at the position where the first floor slab exists in the floor structure before renovation, the floor structure before renovation is reduced in weight, so that the floor structure before renovation can be reduced without reducing the floor area. Weight reduction can be achieved. Moreover, like the reinforcing method which provides a brace in an opening part, a flow line is interrupted | blocked or designability falls and habitability is not impaired.
By these, repair which improves the earthquake resistance of a building can be performed without impairing habitability.

  Moreover, since the installation and removal of the floor slab in the second embodiment can be performed partially, so-called “construction while staying” is possible. For example, the floor slab can be installed and removed only on the nth floor, or the floor slab can be installed and removed only on a part of the nth floor. Therefore, a resident can use a building as usual in the other floor or the other part of the floor.

  The second embodiment of the present invention has been described above.

  In the second embodiment, an example of repairing a steel structure building has been shown. However, since a steel structure can be installed and removed relatively easily, a steel structure structure is the first. It is effective to apply the second embodiment.

  In the second embodiment, the floor structure before renovation is reduced by replacing the first floor slab with the second floor slab 22 having a density lower than that of the first floor slab. The load can be used to construct a new floor structure.

  For example, as shown in the elevation view of FIG. 7, a part of the first floor slab arranged on the existing floor 78 from the first floor to the eighth floor of the building 82 is replaced with the second floor slab 22 to reduce the weight. The extension floor 80 can be constructed on the 9th to 11th floors using the second floor slab 22. Further, for example, as shown in the elevation view of FIG. 8, a part of the first floor slab arranged on the existing floor from the first floor to the sixth floor of the building 84 is replaced with the second floor slab 22, and the floor A lightweight second floor slab 22 can be arranged as a suspended floor on the first and second floors having a large height.

  As described above, even if the extension floor 80 is constructed or the second floor slab 22 is arranged as a suspended floor, the weight of the entire buildings 82 and 84 is not greatly changed before and after the repair. The floor expansion can be renewed without reinforcing the frame and frame.

  Further, in the second embodiment, by replacing the first floor slab with the second floor slab 22 having a density lower than that of the first floor slab, the floor structure before renovation can be reduced without reducing the floor area. However, the modification as shown in FIGS. 9A and 9B can be performed by applying this.

  In the plan view of FIG. 9A, the floor 86 before the repair is shown. Staircases 88 are provided at three locations on the floor 86. On such a floor 86, as shown in the plan view of FIG. 9B, the existing staircase 88 is moved to the outside, and a plurality of second floor slabs 22 are arranged side by side in this portion (FIG. 9B). (The area where a plurality of second floor slabs 22 are arranged side by side is shown as area 90). Since the second floor slab 22 is lightweight, even if such a repair is performed, the weight of the entire floor 86 does not increase significantly. In this way, effective use of the floor area can be achieved.

  The first and second embodiments of the present invention have been described above.

  In the first and second embodiments, the weight of the floor structure is reduced by arranging the second floor slab 22 having a density lower than that of the first floor slab. Can be adjusted and the center of gravity and vibration characteristics of the building can be adjusted and improved.

  For example, in an eccentric building, a light weight floor (in the first and second embodiments, the second floor slab 22) is placed on a portion where the weight is present unevenly, and the eccentricity is corrected, Lightweight floors (in the first and second embodiments, the second floor slab 22) are placed on floors and upper floors that are greatly shaken by the wind to reduce the weight of these floors and reduce shaking. be able to.

  As mentioned above, although 1st and 2nd embodiment of this invention was described, this invention is not limited to such embodiment at all, You may use combining 1st and 2nd embodiment, Needless to say, the present invention can be implemented in various modes without departing from the gist of the present invention.

14, 82, 84 Building 16, 44, 48 Floor structure 22 Second floor slab 24, 42, 46 Core wall (seismic member)
30 Lower plate 32 Core portion 50, 52, 54, 56, 58 Floor slab (second floor slab)

Claims (4)

A first floor slab formed of concrete;
A second floor slab that forms a floor surface with the first floor slab and is less dense than the first floor slab,
Have
The first floor slab is a floor structure in which a plurality of the first floor slabs are arranged so that a shearing force in the floor slab surface is transmitted to an earthquake-resistant member provided in the building. The second floor slab is
A core part that is a core material;
A metal lower plate provided on the lower surface of the core portion;
The floor structure according to claim 1.   A building having the floor structure according to claim 1. In a floor structure repair method for repairing a floor structure constituting a floor surface by arranging a plurality of first floor slabs formed of concrete,
The first floor slabs other than the first floor slab in the minimum necessary position for transmitting the shear force in the floor slab surface to the seismic member provided in the building are less dense than the first floor slab. Floor structure refurbishment method to exchange with 2 floor slabs.

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