Reinforcement structure of the building

Abstract

To provide a reinforcing structure of a building capable of reducing a plane cross-sectional area of an outer peripheral column.SOLUTION: A reinforcing structure of a building has a core part 12 provided on a building 10, and a plurality of concrete outer peripheral columns 20 provided on an outer peripheral part of the building 10. At least a part of the outer peripheral columns 20 of the building 10 is composed of a thin column 34 with higher concrete strength and smaller flat cross-sectional area than other peripheral columns 20.SELECTED DRAWING: Figure 3

Description

[Technical Field]

[0001] The present invention relates to a reinforced structure for a building. [Background technology]

[0002] In a typical high-rise building, the weight of the building supported by the columns on the upper floors decreases, so it is possible to lower the concrete strength of the columns on the upper floors without changing their planar cross-sectional area, or to reduce the planar cross-sectional area without changing the concrete strength of the columns.

[0003] In light of the characteristics of such high-rise buildings, the planar cross-sectional area of ​​the perimeter columns installed on the perimeter is sometimes reduced to improve the view and effective area ratio on the upper floors of the building. For example, Patent Document 1 discloses a building structure in which some of the perimeter columns are slender columns (high axial force slender columns) that have the same concrete strength (compressive strength) as the other perimeter columns but have a smaller cross-section than the other perimeter columns. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Laid-Open No. 2006-138127 Summary of the Invention [Problem to be solved by the invention]

[0005] In the building disclosed in Patent Document 1, by having the core bear most of the seismic force, it is possible to make some of the perimeter columns slender with small cross sections. However, because the concrete strength of the slender columns is equivalent to that of the other perimeter columns, it was difficult to increase the reduction ratio of the planar cross section of the slender columns relative to the other perimeter columns.

[0006] In view of the above, the present invention aims to provide a reinforcement structure for a building that can reduce the planar cross-sectional area of ​​the outer perimeter columns. [Means for solving the problem]

[0007] The reinforcement structure for a building described in claim 1 comprises a core portion provided in the building and a plurality of concrete outer periphery columns provided on the periphery of the building, and at least some of the outer periphery columns of the building are slender columns having a higher concrete strength and a smaller planar cross-sectional area than the other outer periphery columns.

[0008] According to the above configuration, at least some of the building's perimeter columns are slender columns with higher concrete strength and smaller planar cross-sectional areas than the other perimeter columns. By making the concrete strength of the slender columns higher than that of the other perimeter columns, the planar cross-sectional areas of the slender columns can be made smaller than in a configuration where the concrete strength of the slender columns is equal to that of the other perimeter columns. This improves the view from the floors where the perimeter columns are slender and increases the effective area ratio.

[0009] The reinforcement structure of a building described in claim 2 is the reinforcement structure of a building described in claim 1, wherein the core portion has a plurality of internal columns, and in the building, at a transition floor where the external peripheral column directly above or below is switched to the thin column, the concrete strength and planar cross-sectional area of ​​the internal column are equal to or greater than the concrete strength and planar cross-sectional area of ​​the internal column of the floor directly above or below the transition floor.

[0010] According to the above configuration, by making the concrete strength and planar cross-sectional area of ​​the internal columns of the switching floor equal to or greater than the concrete strength and planar cross-sectional area of ​​the internal columns of the floor immediately above or below the switching floor, the internal columns can be made to bear the transitional shear force caused by the outer columns being switched to slender columns. [Effects of the Invention]

[0011] According to the reinforcement structure for a building of the present invention, the planar cross-sectional area of ​​the outer perimeter columns can be reduced. [Brief explanation of the drawings]

[0012] [Figure 1]1 is a cross-sectional elevation view showing a reinforcement structure for a building according to an embodiment of the present invention; [Figure 2] 1 is a cross-sectional plan view showing the lower floors of a building in a reinforcement structure for a building according to an example of an embodiment. FIG. [Figure 3] 1 is a cross-sectional plan view showing a switching floor of a building in a reinforcement structure for a building according to an example of an embodiment. [Figure 4] 1 is a cross-sectional plan view showing the upper floors of a building in a reinforcement structure for a building according to an example embodiment. FIG. DETAILED DESCRIPTION OF THE INVENTION

[0013] A reinforcement structure for a building according to an example of an embodiment of the present invention will be described below with reference to Figures 1 to 4. In the figures, arrow X indicates the horizontal direction, and arrow Y indicates the vertical direction (up and down direction).

[0014] (Overall structure) As shown in Fig. 1, the building 10 of this embodiment is a high-rise building consisting of multiple floors (for example, 23 floors in this embodiment). As shown in Figs. 2 and 3, the building 10 has a rectangular shape in plan view, and a core section 12, which is also rectangular in plan view, is provided in the approximate center of the building 10.

[0015] The core section 12 has shear rigidity and extends vertically across multiple floors of the building 10, as shown in Fig. 1. Note that the core section 12 does not necessarily have to be located in the center of the building 10, and does not necessarily have to be rectangular in plan view.

[0016] As shown in FIGS. 2 to 4, in this embodiment, the core portion 12 is made up of a plurality of (four in this embodiment) internal columns 14 and a plurality of (four in this embodiment) internal beams 16.

[0017] The multiple internal columns 14 are, for example, made of reinforced concrete, extend in the vertical direction, and are arranged in a ring shape at predetermined intervals along the outer periphery of the core portion 12.

[0018] The multiple interior beams 16 are, for example, made of reinforced concrete and are arranged in a ring shape along the outer periphery of each floor of the core section 12. Each interior beam 16 is also erected between adjacent interior columns 14, and together with the interior columns 14, constitutes the framework of each floor of the core section 12.

[0019] Furthermore, reinforced concrete earthquake-resistant walls (not shown) are provided within the framework formed by the interior columns 14 and interior beams 16 in the core section 12. Furthermore, the core section 12 has a hollow common section 18, which is provided with, for example, an elevator lobby, elevator shaft, stairs, equipment shaft, etc. (not shown). Note that the core section 12 only needs to be formed by at least the interior columns 14 and interior beams 16, and is not required to have earthquake-resistant walls.

[0020] The periphery of the building 10 is provided with a plurality (12 in this embodiment) of periphery columns 20 and a plurality (12 in this embodiment) of periphery beams 22 joined (pin-jointed or rigidly joined) to the periphery columns 20.

[0021] The multiple outer perimeter columns 20 are, for example, made of reinforced concrete and extend in the vertical direction. The multiple outer perimeter columns 20 are arranged at predetermined intervals along the perimeter of the building 10, surrounding the core 12.

[0022] The multiple perimeter beams 22 are, for example, made of reinforced concrete and are arranged in a ring shape along the perimeter of each floor of the building 10. Each perimeter beam 22 is erected between adjacent perimeter columns 20 and, together with the perimeter columns 20, constitutes the perimeter frame of each floor of the building 10. On each floor, the space between this perimeter frame and the core 12 is used as living space.

[0023] Furthermore, a plurality of (eight in this embodiment) girders 24 are erected between the interior columns 14 and the outer periphery columns 20. The girders 24 are, for example, made of reinforced concrete, and one end of each is joined (by pin or rigid joint) to the interior columns 14 located at the four corners of the core section 12, and the other end is joined (by pin or rigid joint) to the outer periphery columns 20 facing the interior columns 14. In this way, the core section 12 and the outer periphery columns 20 are connected by the girders 24.

[0024] The joints between the outer perimeter columns 20 and outer perimeter beams 22, the joints between the interior columns 14 and girder 24, and the joints between the outer perimeter columns 20 and girder 24 are not limited to pin joints or rigid joints, but may also be semi-rigid joints.

[0025] 1, a reinforced concrete slab 26 that forms the floor of the floor immediately above is constructed on top of the main beam 24. An exterior wall (not shown) is provided outside the outer perimeter columns 20 and outer perimeter beams 22 of the building 10.

[0026] In addition, in this embodiment, as an example, the building 10 is divided into three floors: lower floors 28 (e.g., floors 1 to 19), switching floor 30 (e.g., floor 20), and upper floors 32 (e.g., floors 21 to 23), and the planar cross-sectional areas of the internal columns 14 and outer peripheral columns 20 are different on each floor.

[0027] (Lower floor structure) 2, on the lower floors 28 of the building 10, the concrete strength (T1) and the planar cross-sectional area (D1×D2) of the multiple perimeter columns 20 are all the same. In addition, the concrete strength (T1) and the planar cross-sectional area (D1×D2) of the multiple interior columns 14 are also the same as the concrete strength (T1) and the planar cross-sectional area (D1×D2) of the perimeter columns 20.

[0028] In this embodiment, "concrete strength" refers to the compressive strength of concrete. Specifically, "concrete strength" is measured using the "Test Method for Compressive Strength of Concrete" specified in JIS A 1108:2018, and in design terms, refers to the standard design strength of concrete determined based on this strength. The specific concrete strength (T1) and planar cross-sectional area (D1 × D2) of the perimeter columns 20 on the lower floors 28 are set appropriately depending on various conditions, such as the floor plan and structural plan of the building 10.

[0029] (Switching floor structure) As shown in Figure 1, the switching floor 30 is located on the floor immediately above the lower floor 28. In this embodiment, the switching floor 30 refers to a floor on which at least some of the multiple peripheral columns 20 have been switched to slender columns 34 in comparison with the peripheral columns 20 immediately above or below. Here, the slender columns 34 refer to columns having a higher concrete strength and a smaller planar cross-sectional area than the other peripheral columns 20 on the floor in question (the switching floor 30).

[0030] That is, a floor where a thin pillar 34 is located directly above the peripheral pillar 20 of the floor immediately below, or a floor where a thin pillar 34 is located directly below the peripheral pillar 20 of the floor immediately above, corresponds to the switching floor 30. As shown in Figure 3, on the switching floor 30 of this embodiment, the four peripheral pillars 20 located at the four corners of the building 10 are each switched to thin pillars 34 relative to the lower floor 28 (see Figure 2).

[0031] It is preferable that the concrete strength (T2) of the slender columns 34 is at least twice the concrete strength (T1) of the periphery columns 20, and that the planar cross-sectional area (D3 × D4) is not more than 0.5 times the planar cross-sectional area (D1 × D2) of the periphery columns 20. Furthermore, it is more preferable that the concrete strength (T2) of the slender columns 34 is at least four times the concrete strength (T1) of the periphery columns 20, and that the planar cross-sectional area (D3 × D4) is not more than 0.25 times the planar cross-sectional area (D1 × D2) of the periphery columns 20. By increasing the concrete strength (T2) of the slender columns 34, it is possible to make the planar cross-sectional area (D3 × D4) of the slender columns 34 smaller.

[0032] In this embodiment, as an example, the design standard strength of the concrete of the outer perimeter columns 20, i.e., the concrete strength (T1), is 36 N / mm 2 The cross-sectional area (D1 × D2) is approximately 1000 mm × 1000 mm. In contrast, the design strength of the concrete of the slender column 34, i.e., the concrete strength (T2), is 300 N / mm 2 The cross-sectional area (D3 x D4) is approximately 420mm x 450mm.

[0033] Furthermore, on the switching floor 30, the concrete strength (T1) and the plane cross-sectional area (D1×D2) of the interior columns 14 are equivalent to the concrete strength (T1) and the plane cross-sectional area (D1×D2) of the interior columns 14 on the lower floor 28. Similarly, the concrete strength (T1) and the plane cross-sectional area (D1×D2) of the other outer periphery columns 20 other than the slender columns 34 on the switching floor 30 are equivalent to the concrete strength (T1) and the plane cross-sectional area (D1×D2) of the outer periphery columns 20 on the lower floor 28.

[0034] The outer perimeter beams 22 and girders 24 joined to the thin columns 34 have smaller dimensions (widths) than the other outer perimeter beams 22 and girders 24 joined to the outer perimeter columns 20 in order to match the dimensions of the thin columns 34.

[0035] (Upper floor structure) As shown in Figure 1, the upper floor 32 is located directly above the transition floor 30. As shown in Figure 4, on the upper floor 32, similar to the transition floor 30, the four outer perimeter columns 20 located at the four corners of the building 10 are each thin columns 34.

[0036] In addition, the concrete strength (T2, T1) and planar cross-sectional area (D3×D4, D1×D2) of the slender columns 34 on the upper floor 32 and the peripheral columns 20 other than the slender columns 34 are equivalent to the concrete strength (T2, T1) and planar cross-sectional area (D3×D4, D1×D2) of the slender columns 34 on the switching floor 30 and the peripheral columns 20 other than the slender columns 34.

[0037] In this embodiment, the planar cross-sectional areas (D5 x D6) of all (four) internal columns 14 on the upper floor 32 are smaller than the planar cross-sectional areas (D1 x D2) of the internal columns 14 on the lower floor 28 and the switching floor 30. On the other hand, the concrete strength (T1) of the internal columns 14 on the upper floor 32 is equivalent to the concrete strength (T1) of the internal columns 14 on the lower floor 28 and the switching floor 30.

[0038] In addition, the internal beams 16 and girders 24 joined to the internal columns 14 of the upper floor 32 have smaller dimensions (widths) to match the dimensions of the internal columns 14 compared to the internal beams 16 and girders 24 joined to the internal columns 14 of the lower floor 28 (see Figure 2) and the transition floor 30 (see Figure 3).

[0039] (Action and effect) According to the reinforcement structure for a building of this embodiment, at least some of the perimeter columns 20 of the building 10 are made of slender columns 34 having a concrete strength higher than that of the other perimeter columns 20 and a smaller planar cross-sectional area.

[0040] In this way, by making the concrete strength (T2) of the slender column 34 higher than the concrete strength (T1) of the other peripheral columns 20, it is possible to make the planar cross-sectional area (D3 x D4) of the slender column 34 smaller while ensuring the required strength, compared to when the concrete strength of the slender column 34 is the same as the concrete strength of the other peripheral columns 20.

[0041] Specifically, if the concrete strength of all the perimeter columns 20 of the building 10 were the same, the reduction ratio of the planar cross-sectional area of ​​the perimeter columns 20 on the upper floors 32 could only be about 10% of the planar cross-sectional area of ​​the perimeter columns 20 on the lower floors 28. In contrast, in this embodiment, by making the concrete strength of the slender columns 34, for example, twice that of the other perimeter columns 20, the planar cross-sectional area can be reduced to 0.5 times, that is, the reduction ratio of the planar cross-sectional area of ​​the slender columns 34 can be about 50% of the planar cross-sectional area of ​​the other perimeter columns 20.

[0042] This improves the view from the floors (transition floor 30 and upper floors 32) where the outer columns 20 are thin columns 34, and increases the effective area ratio, thereby increasing the added value of the building 10.

[0043] In particular, in this embodiment, the perimeter columns 20 located at the four corners of the upper floors 32 are slender columns 34. Therefore, compared to a configuration in which the perimeter columns 20 of the lower floors 28 are slender columns 34, or a configuration in which the perimeter columns 20 located at locations other than the four corners are slender columns 34, it is possible to make the columns at the corners of the upper floors 32, where good views are expected, thinner, thereby further improving the view from the living space.

[0044] Furthermore, in general, where the peripheral columns 20 are thin columns 34, the planar cross-sectional area of ​​the thin columns 34 is reduced, so that the shear force transmitted to the thin columns 34 is reduced, and the shear force is transferred to the internal columns 14 of the core part 12 accordingly. In other words, a transferred shear force acts on the internal columns 14 of the core part 12.

[0045] Here, according to this embodiment, in the building 10, at the switching floor 30 where the outer perimeter columns 20 of the lower floor 28 have been switched to thin columns 34, the concrete strength and planar cross-sectional area of ​​the interior columns 14 are equivalent to the concrete strength and planar cross-sectional area of ​​the interior columns 14 of the lower floor 28.

[0046] In this way, by making the concrete strength and planar cross-sectional area of ​​the internal columns 14 of the switching floor 30 equivalent to the concrete strength and planar cross-sectional area of ​​the internal columns 14 of the lower floor 28, it becomes possible for the internal columns 14 to bear the transitional shear force caused by the outer peripheral columns 20 being switched to slender columns 34.

[0047] On the other hand, since the weight of the building 10 decreases as the floors 32 become higher, the shear force acting on the internal columns 14 of the upper floors 32 becomes smaller than that of the lower floors 28. For this reason, the planar cross-sectional area (D5 x D6) of the internal columns 14 of the upper floors 32 can be made smaller than the planar cross-sectional area (D1 x D2) of the internal columns 14 of the lower floors, and the effective area ratio of the upper floors 32 can be increased.

[0048] (Other embodiments) Although an example of an embodiment of the present invention has been described above, the present invention is not limited to such an embodiment, and various other embodiments are possible within the scope of the present invention.

[0049] For example, in the above embodiment, girders 24 were installed between the interior columns 14 and the outer periphery columns 20, but a so-called flat slab structure may be used in which only a slab 26 is installed in the living space between the core 12 and the outer periphery frame without installing the girders 24. By using a flat slab structure for the building 10, the ceiling height of the living space on each floor can be increased.

[0050] In particular, in areas where the perimeter columns 20 are slender columns 34, as described above, the planar cross-sectional area of ​​the slender columns 34 is reduced, thereby reducing the shear force transmitted to the slender columns 34. This makes it possible to omit the perimeter beams 22 and main girders 24 joined to the slender columns 34, or to reduce the beam width of the perimeter beams 22 and main girders 24 (to use flat beams).

[0051] In addition, in the above embodiment, the building 10 is divided into three floors, namely, the lower floor 28, the switching floor 30, and the upper floor 32, from the bottom up, and the outer perimeter columns 20 located at the four corners of the switching floor 30 and the upper floor 32 are thin columns 34.

[0052] However, the positions and number of floors in which the outer perimeter columns 20 are thin columns 34 are not limited to the above embodiment, and it is also possible to configure a configuration in which some of the outer perimeter columns 20 on each floor of the building 10 are thin columns 34, or to configure floors with thin columns 34 and floors without thin columns 34 alternately in the vertical direction.

[0053] Even in this case, the floor where the outer columns 20 are switched to thin columns 34 for the floor directly above or below corresponds to the switching floor 30, and at this switching floor 30, the concrete strength and planar cross-sectional area of ​​the interior columns 14 must be equal to or greater than those of the floor directly above or below.

[0054] Furthermore, the positions and number of the perimeter columns 20 that are to be slender columns 34 on each floor of the building 10 are not limited to those in the above embodiment. For example, if each floor of the building has a large area of ​​6 x 6 spans, various patterns are possible, such as a configuration in which the perimeter columns 20 for two spans from the four corners are slender columns 34, a configuration in which the perimeter columns 20 at the four corners and in the middle are slender columns 34, or a configuration in which all the perimeter columns 20 are slender columns 34.

[0055] Furthermore, in the above embodiment, the outer perimeter columns 20 were arranged at the four corners of the building 10, but the arrangement of the outer perimeter columns 20 is not limited to the embodiment, and the outer perimeter columns 20 may be configured not to be arranged at the four corners of the building 10 (configuration in which they are arranged at positions shifted from the four corners), etc.

[0056] In the above embodiment, the concrete strength and plan cross-sectional area of ​​the internal columns 14 of the switching floor 30 are set to be equal to those of the internal columns 14 of the lower floor 28. However, the concrete strength and plan cross-sectional area of ​​the internal columns 14 of the switching floor 30 may be set to be greater than the concrete strength and plan cross-sectional area of ​​the internal columns 14 of the lower floor 28.

[0057] Similarly, although the planar cross-sectional area of ​​the internal columns 14 of the upper floor 32 is smaller than the planar cross-sectional area of ​​the internal columns 14 of the lower floor 28 and the transition floor 30, the planar cross-sectional area of ​​the internal columns 14 of the upper floor 32 may be made equal to the planar cross-sectional area of ​​the internal columns 14 of the lower floor 28 and the transition floor 30.

[0058] In addition, in the above embodiment, the interior columns 14, interior beams 16, perimeter beams 22, girders 24, etc. are made of reinforced concrete, but they may be made of steel frames or the like instead of reinforced concrete. Similarly, in the above embodiment, the exterior columns 20 are made of reinforced concrete, but the exterior columns 20 only need to be made of concrete, and may be made of concrete-filled steel pipes or the like.

[0059] Furthermore, in the above embodiment, the joint portion 18 of the core portion 12 was hollow, but the configuration of the joint portion 18 is not limited to the embodiment, and a slab or the like (not shown) may be appropriately constructed in the joint portion 18. [Explanation of symbols]

[0060] 10 Building 12 Core section 14 Internal columns 20 Periphery pillars 30 Switching Floor 34 Thin pillar

Claims

1. A core part provided in the building; a plurality of concrete outer periphery columns provided on the outer periphery of the building; and a thin column located at the corner of the building on the upper floor, the concrete strength of which is higher than that of the outer perimeter column on the lower floor, and the cross-sectional area of ​​which is smaller. Reinforcement structure of the building.

2. The thin columns have concrete strength at least twice that of the other outer columns. The reinforced structure for a building according to claim 1.

3. The core portion has a plurality of internal pillars, In the building, the interior columns of the transition floor where the outer periphery columns have been switched to the thin columns have concrete strength and planar cross-sectional area equal to or greater than those of the interior columns of the floors immediately above and below the transition floor, The reinforced structure for a building according to claim 1 or 2.

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