JP5601841B2 - Flat slab structure, structure with flat slab structure - Google Patents

Description

  The present invention relates to a flat slab structure and a structure having a flat slab structure.

  As shown in Patent Document 1, the flat slab structure is often composed of a floor slab, a pillar, and a support plate that is provided on the top of the pillar and supports the floor slab. Since there are no beams, the space in the height direction can be effectively used.

  However, since there is no beam, it is necessary to use a flat slab structure slab not to apply a large horizontal force in the event of an earthquake in combination with a ramen structure or a bearing wall. For this reason, the window of sufficient opening area is not provided in the wall surface of a building outer peripheral part, and a floor height is decided by the ceiling height of a ramen structure part. Furthermore, the flexibility of the plan is reduced when the bearing wall is used together.

  According to the flat slab construction method of Patent Document 1, the workability is improved. However, an increase in rigidity against horizontal force cannot be expected.

JP-A-6-81470

  In view of the above-described facts, the present invention aims to increase the rigidity of a flat slab against horizontal force.

The flat slab structure according to the invention of claim 1 is provided across a floor slab, a column disposed on a lower surface of the floor slab, and two adjacent columns, and supports the floor slab. And the support plates are not connected to each other .

  According to the invention described in claim 1, the support plate for supporting the floor slab is provided across the adjacent columns. As a result, a ramen structure is formed by the columns and the support plates, and the ramen structure can bear the horizontal force at the time of the earthquake, and the rigidity of the flat slab with respect to the horizontal force increases.

The flat slab structure according to the invention of claim 2 includes a floor slab, a column, and a support plate that is provided across the adjacent column and supports the floor slab, and is a plane of the support plate The shape is circular, polygonal, or L-shaped, and the support plate straddles three or more columns, and the frame structure formed by the support plates and the columns intersects with each other in plan view. It is characterized by that.

According to the second aspect of the present invention, a circular, polygonal, or L-shaped support plate is provided across three or more columns, and the frame structure is formed by the support plates and the columns. At this time, a line connecting the centers of the columns forming one ramen structure intersects with a line connecting the centers of the columns forming another ramen structure in plan view.
Thereby, the horizontal load from two directions can be borne by the ramen structure provided in the intersecting direction, and the rigidity against the horizontal force of the flat slab is increased.

The structure according to claim 3 has the flat slab structure according to claim 1 or claim 2.
Thereby, the rigidity with respect to the horizontal force of the structure provided with the flat slab structure can be increased.

  Since this invention is set as the said structure, the rigidity with respect to the horizontal force of a flat slab can be increased.

It is a figure which shows the basic composition of the flat slab structure which concerns on the 1st Embodiment of this invention. It is a figure which shows the bending moment characteristic of the flat slab structure which concerns on the 1st Embodiment of this invention. It is a figure which shows the bending moment characteristic of the conventional flat slab structure. It is a figure which shows the basic composition of the conventional flat slab structure. It is a figure which shows the other Example of the flat slab structure which concerns on the 1st Embodiment of this invention. It is a figure which shows the other Example of the flat slab structure which concerns on the 1st Embodiment of this invention. It is a figure which shows the other Example of the flat slab structure which concerns on the 1st Embodiment of this invention. It is a figure which shows the basic composition of the flat slab structure which concerns on the 2nd Embodiment of this invention. It is a figure which shows the other Example of the flat slab structure which concerns on the 2nd Embodiment of this invention. It is a figure which shows the basic composition of the structure based on the 3rd Embodiment of this invention.

(First embodiment)
As shown in FIG. 1, in the flat slab structure 10 according to the first embodiment, a slab that partitions the upper and lower floors of a building 18 is a flat slab 14, and no beam is provided below the flat slab 14. The flat slab 14 is made of reinforced concrete, and the flat slab 14 is supported by a column 20 arranged on the outer periphery of the building 18 and arranged in the Y-axis direction, and columns 12 and 13 arranged between the columns 20 and arranged in the X-axis direction. ing.

  The columns 12, 13, and 20 are all made of reinforced concrete and have the same outer dimension d. A support plate 16 is provided on the heads of the columns 12 and 13, and the support plate 16 supports the flat slab 14.

The support plate 16 is made of reinforced concrete and has a width D1, a length L1, and a thickness H1 that are larger than the external dimension d of the columns 12, 13, 20, and straddles the columns 12, 13 adjacent to each other in the X-axis direction. The joint with the head is rigid.
As a result, the two columns 12, 13 and the support plate 16 constitute a portal ramen, which increases the rigidity in the X-axis direction.

An outer wall 22 is provided between the columns 20 in the Y-axis direction and bears a horizontal force in the Y-axis direction at the time of an earthquake. On the other hand, no outer wall is provided in the X-axis direction of the building 18.
However, a portal ramen is constructed in the X-axis direction of the building 18 and bears the horizontal force in the X direction during an earthquake. As a result, the rigidity of the flat slab 14 with respect to the horizontal force can be increased. In addition, since the portal ramen is constructed, the flat slab 14 can be used without using an outer wall of the building 18 as a load-bearing wall or a means for increasing rigidity such as a ramen structure.

  Specifically, as shown in FIG. 2, when a horizontal force P in the X direction acts on the building 18 in a bending moment diagram superimposed on an elevation obtained by taking out an arbitrary floor, a portal ramen is applied. The bending moment that can be borne by the column 12 and the column 13 in which is formed is a characteristic 28. That is, it is possible to bear up to the maximum bending moment value M1.

Further, the bending moment that can be borne by the support plate 16 constituting the portal ramen and the flat slab 14 on the upper side of the support plate 16 is the characteristic 29, and can be borne up to the maximum bending moment value M1.
Note that the bending moment in the flat slab 14 in a range where the support plate 16 is not provided at the lower portion is a characteristic 30.

  On the other hand, as shown in FIG. 3, in the configuration of the conventional flat slab 14 in which the support plates 24 are independent without being connected to each other, the support plates 24 are provided independently on the columns 12 and 13, respectively. The portal ramen is not constructed in the X direction. The outer dimension D2 of the support plate 24 is larger than the dimension of the column d, and the support plates 24 each independently resist the force P in the X-axis direction.

  Specifically, when the force P is applied in the X-axis direction, as shown in the moment diagram superimposed on the elevation of a part of the building 18 shown in FIG. The resulting bending moment is characteristic 32. Further, the bending moment that can be borne by the flat slab 14 between the columns 12 and 13 is a characteristic 33. Both can bear up to the maximum bending moment value M2. Further, the bending moment that can be borne by the flat slab 14 other than between the columns 12 and 13 also becomes the characteristic 33.

Here, the bending moment value M2 that can be borne in the configuration of the conventional flat slab 14 is not a ramen structure, and is smaller than the bending moment value M1 that is a ramen structure.
As a result, as shown in FIG. 4, the conventional building 54 that employs the flat slab 14 is provided with a load-bearing wall 23 on the outer periphery in the X-axis direction at the expense of a lack of opening area, and a horizontal force acting in the X direction. The strength against was secured. Furthermore, the opening 52 has a ramen structure as required.

  FIG. 5 shows a flat slab structure 36 according to another embodiment. The support plate 26 is extended to the outer wall 22 in the X-axis direction, and not only straddles the two columns 12 and 13 but also straddles four columns including the outer peripheral columns 20 on both sides.

  Thereby, not only between the pillars 12 and 13 and the support plate 26, but also between the pillars 12 and 20 and the support plate 26 and between the pillars 13 and 20 and the support plate 26, a portal ramen can be formed. . As a result, the rigidity against the horizontal force in the X-axis direction can be further increased.

  Moreover, according to the intensity | strength requested | required as a ramen structure, it is good also as a structure where the support plate 27 straddles three pillars which consist of pillars 12 and 13 and the pillar 20 adjacent to either. Further, the support plate 25 may be provided across the columns 12 and 20, or the support plate 25 may be provided across the columns 13 and 20.

FIG. 6 shows a flat slab structure 37 according to another embodiment. The flat slab structure 37 includes a support plate 16 that straddles the columns 12 and 13 in the X-axis direction, a support plate 38 that straddles the columns 12 and 12 in the Y-axis direction, and a space between the columns 13 and 13 in the Y-axis direction. It is the structure which has the support plate 39 straddling. Thereby, not only the X-axis direction but also the rigidity in the Y-axis direction can be increased.
That is, in order to increase the rigidity in two intersecting directions, a support plate can be provided across the plurality of columns in the two intersecting directions even in the same building 18.

  In the present embodiment, the pillars 12, 13 and 20 are all exemplified as the same external dimension d, but the respective pillars may have different external dimensions. In addition, although the cross-sectional shapes of the pillars 12, 13, and 20 have been described as square, the respective pillar shapes are not limited to squares, and the cross-sectional shapes of the pillars 62, 63 are illustrated as illustrated in FIG. It may be circular. Further, as illustrated in FIG. 7B, the cross-sectional shapes of the columns 64 and 65 may be flat quadrangles.

(Second Embodiment)
In the flat slab structure 40 of the second embodiment, as shown in FIG. 8A, the support plate 42 is formed in an L shape and is provided across the heads of the three columns 12, 13, and 13. Yes. That is, it straddles simultaneously the pillars 12 and 13 adjacent in the X-axis direction and the pillars 13 and 13 adjacent in the Y-axis direction.

At this time, a line K1 connecting the centers of the columns 12 and 13 adjacent in the X-axis direction intersects with a line K2 connecting the centers of the columns 13 and 13 adjacent in the Y-axis direction.
Thereby, the rigidity with respect to the horizontal force in the X-axis direction can be increased by the portal ramen (FIG. 8B) configured by the columns 12 and 13 adjacent to the X-axis direction and the support plate 42. Further, the portal ramen (FIG. 8C) configured by the columns 13 and 13 and the support plate 42 adjacent to each other in the Y-axis direction can increase the rigidity against the horizontal force in the Y-axis direction.

Other configurations are the same as those of the first embodiment, and detailed description thereof is omitted.
A flat slab structure 48 of another application example is shown in FIG. The support plate 44 is formed in a polygon (hexagonal shape) and is provided across the heads of the three columns 12, 13, and 15. A line K1 connecting the centers of the pillars 12 and 13 adjacent in the X-axis direction and a line K2 connecting the centers of the pillars 13 and 15 adjacent in the Y-axis direction intersect with each other.

  As a result, the portal ramen composed of the columns 12 and 13 and the support plate 44 adjacent in the X-axis direction and the portal ramen composed of the columns 13 and 15 and the support plate 44 adjacent in the line K2 direction The rigidity against the horizontal force in the axial direction and the line K2 direction can be increased.

  Moreover, as shown in FIG. 9B, in the flat slab structure 50 of another application example, the support plate 46 has a circular shape and straddles the four columns 12, 13, 12, and 13. Two lines K1 connecting the centers of the columns 12 and 13 adjacent in the X-axis direction intersect with two lines K2 connecting the centers of the columns 12 and 13 adjacent in the Y-axis direction.

  As a result, the horizontal load from two directions is applied to the frame structure composed of the columns 12, 12 and the support plate 46, and the frame structure composed of the columns 12, 13 and the support plate 46 provided in a direction intersecting with the frame. And the rigidity of the flat slab 14 against the horizontal force can be increased.

(Third embodiment)
As shown in FIG. 10, the upper and lower floors of the structure 60 according to the third embodiment are partitioned by a flat slab 14 made of reinforced concrete. The flat slab 14 is supported by pillars 20 provided continuously on the outer periphery of the structure 60 in the Y-axis direction and internal pillars 12 and 13 provided between the pillars 20. In the Y-axis direction of the structure 60, an outer wall 22 is provided between the pillars 20 and bears a horizontal force during an earthquake in the Y-axis direction.

  The heads of the columns 12 and 13 are provided with reinforced concrete support plates 16 straddling the columns 12 and 13 adjacent in the X-axis direction, and the heads of the columns 12 and 13 and the support plates 16 are rigidly connected. Has been. Thereby, a portal ramen is formed with the pillars 12 and 13 and the support plate 16, and bears the horizontal force at the time of the earthquake of an X-axis direction.

  As a result, it is possible to provide the structure 60 that includes the flat slab 14 and has increased rigidity against horizontal force.

10 Flat slab structure 12 Pillar 13 Pillar 14 Flat slab (floor slab)
16 Support plate 20 Peripheral column 42 Support plate (L-shaped)
44 Support plate (polygon)
46 Support plate (circular)
60 Building (structure)

Claims (3)

Floor slab,
Pillars arranged on the lower surface of the floor slab ,
A supporting plate that is provided across two adjacent pillars and supports the floor slab;
Have
A flat slab structure in which the support plates are not connected to each other . Floor slab,
Pillars,
A strut that is provided across the adjacent pillars and supports the floor slab;
Have
The planar shape of the support plate is circular, polygonal, or L-shaped, the support plate straddles three or more of the columns, and the frame structure formed by the support plate and the columns is a plane. flat slab structure cross each other in the view.   The structure provided with the flat slab structure of Claim 1 or Claim 2.

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