Flat beam support structure

Abstract

To provide a support structure having efficient rigidity to torsion etc. generated in a flat beam constituting a central corridor.SOLUTION: Two inner columns 2, 2 are erected to face so as to include both sides in a width direction of a flat beam 10 extending in a span direction. A virtual reinforcement beam 20 which connects the facing two inner columns 2, 2, includes reinforcement beam bars 21 and stirrups 23 surrounding the reinforcement beam bars 21, and is perpendicular to a beam main bar 6 of the flat beam 10 is formed in the flat beam 10. Ends of the flat beam 10 are supported by the two inner columns 2 and the virtual reinforcement beam 20 in the flat beam 10.SELECTED DRAWING: Figure 2

Description

[Technical field]

[0001] The present invention relates to a flat beam support structure, and more particularly to a flat beam support structure that can stably support the ends of flat beams in central corridor type buildings in which flat beams are used as structural members of the central corridor. [Background technology]

[0002] For example, buildings with a central corridor are constructed in hospital wards, hotel rooms, apartment buildings, etc., so that rooms are arranged side by side on both sides of the corridor. Patent Document 1 discloses an architectural structure that does not have columns or beams as structural load-bearing members in the central corridor section inside the building. In this architectural structure, the exterior walls in the girder direction function as wall beams, and the partition walls in the span direction function as independent earthquake-resistant walls, so that the flat slab that constitutes the central corridor is supported without using internal columns or internal beams.

[0003] Patent Document 2 discloses a building framework structure in which multiple small beams are provided in both directions on both spans of a beamless slab that constitutes a central corridor erected between girders, and the periphery of the beamless slab is supported by each small beam. Furthermore, at both ends of the small beams 10 in the girder direction, studs 11 are erected to support the beamless slab via the small beams 10. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Publication No. 57-51372 [Patent Document 2] JP 2001-329610 A Summary of the Invention [Problem to be solved by the invention]

[0005] In the architectural structure disclosed in Patent Document 1, both sides of the central corridor in the girder direction are free structures that are not fixedly supported by the partition walls that extend in the span direction and separate each room and the exterior walls, so the rigidity of the slab that constitutes the central corridor cannot be sufficiently ensured. Also, in the building framework structure disclosed in Patent Document 2, both sides of the central corridor in the girder direction are supported by small beams 10, which are supported by studs 11 that support one end of a main beam 12, but the small beams 10 require the arrangement of multiple small beams such as small beams 17, 18, etc., which creates a problem that the configuration of the members supporting the central corridor becomes complicated.

[0006] Therefore, the object of the present invention is to eliminate the problems associated with the conventional technology described above and to provide a flat beam support structure in which the flat beam that constitutes the central corridor is supported by two internal columns located close to both sides of the flat beam. [Means for solving the problem]

[0007] The present invention relates to In a flat beam support structure that functions as a structural member of a middle corridor extending in the beam direction of a building, two internal columns are erected at the support end position of the flat beam in the girder direction so as to include both sides in the width direction of the flat beam, and a virtual reinforcing beam is formed in the flat beam in which the reinforcing beam bars connecting the two internal columns are arranged so as to be perpendicular to the beam main bars of the flat beam, and the support end of the flat beam in the girder direction is It is characterized by being supported.

[0008] It is preferable that the virtual reinforcing beam is formed within the flat beam so as to include the reinforcing beam bar and stirrups arranged surrounding the reinforcing beam bar.

[0009] It is preferable that both ends of the reinforcing beam are fixed within the two columns with a predetermined fixing length.

[0010] As another invention, two columns are erected facing each other so as to include both widthwise sides of a flat beam extending in the girder direction, and a virtual reinforcing beam is formed within the flat beam in which reinforcing beam bars connecting the two facing columns and reinforcing steel material along the reinforcing beam bars are arranged perpendicular to the main beam bars of the flat beam, and the ends of the flat beam are supported by the two columns and the virtual reinforcing beam within the flat beam.

[0011] It is preferable that both ends of the reinforcing steel material are embedded within the two pillars with a predetermined anchorage length.

[0012] It is preferable that a reinforcing plate material is added to a part of the reinforcing steel material.

[0013] Furthermore, as another invention, two columns are erected facing each other so as to include both side edges in the width direction of a flat beam extending in the girder direction, and a virtual reinforcing beam is formed within the flat beam, with reinforcing beam bars connecting the two facing columns and reinforcing bars arranged in the reinforcing beam bars' arrangement position across the width of the flat beam, with hinge relocation reinforcing bars arranged in the main reinforcement direction of the flat beam so as to be perpendicular to the main reinforcement bars of the flat beam, and the ends of the flat beam are supported by the two columns and the virtual reinforcing beam within the flat beam.

[0014] It is preferable that a second reinforcing steel member is additionally joined to the reinforcing steel member along the main reinforcement direction of the flat beam.

[0015] It is preferable that the main beam reinforcement of the flat beam is arranged only in the range perpendicular to the virtual reinforcing beam position. Effect of the Invention

[0017] According to the present invention, in a center-corridor type building in which flat beams are used in the center corridor, the ends of the flat beams can be stably supported by two upright columns and a virtual reinforcing beam formed between the two columns. [Brief description of the drawings]

[0018] [Figure 1] Fig. 1(a) is a partial front view showing a part of a building in which the flat beam support structure of the present invention is applied to the support structure of the center corridor. Fig. 1(b) is a partial plan view taken along the Ib-Ib cross-sectional line of the building shown in Fig. 1(a). [Diagram 2] 2 is a partial cross-sectional view showing a schematic cross section of each part of the flat beam support structure (first embodiment) of the present invention in the range surrounded by a dashed line rectangle in both figures. FIG. [Diagram 3] 4A to 4C are partial cross-sectional views each showing a cross section of a flat beam support structure (second embodiment) according to the present invention. [Figure 4] FIG. 4 is a partial cross-sectional view showing an example of a reinforcing structure for the flat beam support structure of the present invention. [Diagram 5] 4A to 4C are partial cross-sectional views each showing a cross section of a flat beam support structure (third embodiment) according to the present invention. [Figure 6] 11A to 11C are partial cross-sectional views each showing a cross section of a flat beam support structure (fourth embodiment) according to the present invention. [Figure 7] 13A to 13C are partial cross-sectional views each showing a cross section of a flat beam support structure (fifth embodiment) according to the present invention. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0019] Hereinafter, configurations of first to fifth embodiments of the flat beam support structure of the present invention will be described with reference to the accompanying drawings.

[0020] Fig. 1(a) is a front view of a part of a building in which the flat beam support structure of the present invention is applied to the support structure of flat beams 10 constituting a central corridor 5. Fig. 1(b) is a plan view of the flat beam support structure of the flat beams 10 constituting a central corridor 5 on a floor including the range of the central corridor 5 surrounded by a dashed rectangle A in Fig. 1(a).

[0021] In a building to which the flat beam support structure of the present invention is applied, as shown in Figs. 1(a) and (b), a flat beam 10 is used as a structural member constituting the central corridor 5 of the building 1. The flat beam 10 has a beam width in which the position indicated by the dashed line in Fig. 1(b) is the side edge portion 10a, and is laid continuously along the building Y direction. At this time, both side portions 10a in the longitudinal direction of the flat beam 10 are joined to and supported by two internal columns 2 supporting the main beam 3 provided at a predetermined interval along the building Y direction so as to surround each of the internal columns 2. Furthermore, reinforcing beam bars 21 are arranged in a direction perpendicular to the main bar direction of the flat beam 10 (building Y direction) so as to connect the two opposing internal columns 2.

[0022] The reinforcing beam bars 21 are made of multiple reinforcing bars with a larger amount of reinforcement than the amount of reinforcement of the main reinforcement bars 6 of the flat beams 10, and as shown in each of Figs. 1, the ends are fixed to the interior columns 2 by a predetermined length and are arranged in the building X direction. By arranging the reinforcing beam bars 21 in the flat beams 10, a virtual reinforcing beam is formed in the flat beams 10. This virtual reinforcing beam 20 has a span between the two interior columns 2 and has a beam width narrower than the column width of the interior columns 2. By forming this virtual reinforcing beam 20 to connect the two opposing interior columns 2 that are the support positions of the flat beams 10, the flat beams 10 are supported in a structural state with sufficient rigidity against torsion and the like that occurs at the flat beam support positions (support positions by the interior columns 2).

[0023] Hereinafter, several embodiments of the flat beam support structure in the area surrounded by the rectangle A (dotted line) in both Figs. 1 and 2 will be described with reference to Figs. 2 to 7. Note that, although the cross sections of the members are shown in each figure, hatching of the cross sections is omitted to make it easier to understand the reinforcement state in each part.

[0024] [First embodiment] Each figure in Fig. 2 shows a schematic diagram of the flat beam 10 and the reinforcement state of the support position (internal column position) of the flat beam end. Fig. 2(b) shows the reinforcement state of the beam main reinforcement 6 and the stirrup reinforcement 7 and core reinforcement 8 surrounding the beam main reinforcement in the general part of the flat beam 10. As shown in Figs. 2(a) and (b), the beam main reinforcement 6 of the flat beam 10 is arranged so as to pass between the two internal columns 2 along the Y direction of the building so as to be surrounded by the stirrup reinforcement 7 arranged at a predetermined pitch along the girder direction, and the end of the beam main reinforcement 6 at the joint with the internal column 2 is fixed in the internal column 2 so as to secure a predetermined fixing length.

[0025] The flat beam support structure according to the first embodiment includes a virtual reinforcing beam 20 in which reinforcing beam bars 21 are arranged to connect two opposing internal columns 2 at the support positions (internal column positions) of the flat beam 10 and the flat beam end, as shown in each of Figs. 2(a) to (d) and Fig. 4(a). The reinforcing beam bars 21 of the virtual reinforcing beam 20 are fixed to the internal columns 2 with sufficient fixing length at both ends, and are composed of reinforcing beam main bars 22 arranged in the building X direction at the inside positions of the beam main bars of the flat beam 10 arranged in the upper and lower stages, stirrups 23 arranged at a predetermined interval in the reinforcing beam main bars 22 arrangement direction so as to surround the multiple reinforcing beam main bars 22 arranged in the upper and lower stages, and multiple core bars 24. By arranging the virtual reinforcing beam 20, in which these steel bars are arranged, within the thickness of the flat beam 10 so as to connect between the two internal columns 2, the rigidity at the support position of the flat beam 10 can be increased, and it can reliably resist twisting and other deformations that occur at this position.

[0026] [Second embodiment] As shown in each of Figs. 3, the flat beam support structure according to the second embodiment includes a virtual reinforcing beam 20 in which reinforcing steel is arranged at a position surrounded by reinforcing beam bars 21 connecting two opposing internal columns 2 at the support position (internal column position) of the flat beam 10 and the flat beam end. The reinforcing beam bars 21 of the virtual reinforcing beam 20 are composed of the reinforcing beam main bars, stirrups, and core bars, which are almost the same as those in the first embodiment (Figs. 2(a) to (d)). In this embodiment, two H-shaped steels are installed as reinforcing steel 30 located in the cross section surrounded by the stirrups, as shown in Figs. 3(a) to (c) and 4(b). As shown in Figs. 3(a) and (b), these reinforcing steels 30 are embedded in the two internal columns 2 facing each other at both ends with a sufficient length, and the central parts are joined via a joint plate 31, functioning as one beam member connecting the two internal columns 2. By installing these reinforcing steel materials 30 in addition to the reinforcing beam bars 21, the rigidity of the virtual reinforcing beam 20 can be further increased. In addition to H-shaped steel, shaped steel of various cross-sectional shapes that can ensure a predetermined rigidity can be used as the reinforcing steel materials 30. The internal column 2 of this embodiment can also be manufactured as a precast concrete column member with the reinforcing steel materials 30 attached in advance.

[0027] 4(c) and (d) show modified examples in which a reinforcing plate material is added to the H-shaped steel as the reinforcing steel material 30 to further increase the rigidity (torsion resistance) of the virtual reinforcing beam 20. FIG. 4(c) shows an example in which a rib plate 32 is attached between the upper and lower flanges of the H-shaped steel to increase the torsional rigidity of the reinforcing steel material 30. The rib plates 32 are preferably provided at a predetermined pitch along the longitudinal direction of the reinforcing steel material 30. In addition, the installation intervals can be narrowed or changed to ensure rigidity in the vicinity of the internal column 2. FIG. 4(d) shows a modified example in which a gusset plate 33 is attached so as to connect between the rib plates 32 attached to the two H-shaped steels arranged side by side as shown in FIG. 4(c). By integrating the two H-shaped steels, the rigidity of the virtual reinforcing beam 20 can be further increased, and the torsional resistance at the position of the virtual reinforcing beam 20 can be improved.

[0028] [Third embodiment] As shown in each of the drawings of FIG. 5, the flat beam support structure according to the third embodiment includes a virtual reinforcing beam 20 in which hinge relocation reinforcement 25 is additionally arranged on the reinforcing beam bar 21 connecting two opposing internal columns 2 at the support position (internal column position) of the flat beam 10 and the flat beam end. The hinge relocation reinforcement 25 of this embodiment has a function of moving the plastic hinge position generated at the end of the flat beam 10 along the vicinity of the outer surface of the internal column 2 from the vicinity of the outer surface of the internal column 2 to the center of the span of the flat beam 10 in the building Y direction. In this embodiment, the amount of reinforcing bar of the hinge relocation reinforcement 25 is set to be about 20% larger than the amount of reinforcement of the beam main reinforcement of the flat beam 10. As shown in FIG. 5(a), the hinge relocation reinforcement 25 is arranged at equal intervals to the stirrups of the reinforcing beam bar 21, and is also arranged in the internal column 2 located at the end of the flat beam 10. A hook is provided at the end of the hinge relocation reinforcement bar 25 to ensure that a plastic hinge occurs at the end of the hinge relocation reinforcement bar 25. The length of the hinge relocation reinforcement bar 25 can be appropriately set according to the design position where a plastic hinge is to occur.

[0029] [Fourth embodiment] As shown in FIG. 6, the flat beam support structure according to the fourth embodiment includes a virtual reinforcing beam 20 having reinforcing steel 30 arranged along the reinforcing beam bar 21 shown in the second embodiment, and a second reinforcing steel 35 in the flat beam 10 main bar direction is joined to a predetermined position of the reinforcing steel 30 (hereinafter referred to as the first reinforcing steel 30) in the virtual reinforcing beam 20. The first reinforcing steel 30 and the second reinforcing steel 35 in this embodiment are both made of H-shaped steel of the same size. The second reinforcing steel 35 is fixedly joined to the first reinforcing steel 30 so as to extend from the virtual reinforcing beam 20 in the flat beam 10 span outer direction so as to form a substantially V-shaped shape in a plan view near the span center of the first reinforcing steel 30 whose base portion is embedded and supported in the internal column 2. In this embodiment, the length of the second reinforcing steel 35 is set to be equal to the length from the outer edge of the first reinforcing steel 30 to the hinge occurrence position assuming hinge relocation. When the internal column 2 is manufactured as a precast concrete column member, the first reinforcing steel member 30 and the second reinforcing steel member 35 may be integrated by welding the respective parts in advance, or may be assembled into a predetermined shape on-site by bolting. In this embodiment, H-shaped steel of the same size is used for the first reinforcing steel member 30 and the second reinforcing steel member 35, but it goes without saying that the size, steel type, and attachment position of each member can be appropriately set according to the design.

[0030] [Fifth embodiment] As shown in each figure of FIG. 7, the flat beam support structure according to the fifth embodiment is also provided with a virtual reinforcing beam 20 having reinforcing beam bars 21 that connect two opposing internal columns 2 at the support position (internal column position) of the flat beam end, as in each embodiment. The main beam bars at the flat beam end are arranged to cross the virtual reinforcing beam 20 position between the two internal columns 2, as shown in FIG. 7(a) and (c), but the main beam bars at the end of the flat beam 10 in the range from the side of the flat beam 10 to the width of the internal column 2 are fixed at the end near the outer surface of the internal column 2 and are not extended into the internal column 2, as shown in FIG. 7(a) and (b). By arranging the main beam bars of the flat beam 10 in this way, the reinforcing bar range at the internal column 2 position can be made compact, making it easier to design vertical penetration of equipment piping, etc.

[0031] The present invention is not limited to the above-described embodiment, and various modifications are possible within the scope of the claims. In other words, the technical scope of the present invention also includes embodiments obtained by combining technical means that are appropriately modified within the scope of the claims. [Explanation of symbols]

[0032] 1. Building 2 Internal columns 5 Middle corridor 6 Main beam reinforcement 10 flat beam 20 Virtual Reinforcement Beam 21 Reinforcement beams 22 Reinforced beam main bars 23 Rib muscles 24 Core muscle 25 Hinge relocation reinforcement bar 30 Reinforcing steel (first reinforcing steel) 32 Rib Plate 33 Gusset plate 35 Second reinforcing steel

Claims

1. In a flat beam support structure that functions as a structural member of a middle corridor extending in the beam direction of a building, Two internal columns erected at the support end positions in the girder direction of the flat beam so as to include both sides in the width direction of the flat beam; A virtual reinforcing beam formed in the flat beam in which the reinforcing beam bar connecting the two internal columns is arranged perpendicular to the beam main bar of the flat beam, A flat beam support structure, characterized in that the support ends of the flat beams in the longitudinal direction are supported.

2. The flat beam support structure according to claim 1 , wherein the virtual reinforcing beam is formed within the flat beam so as to include the reinforcing beam bar and a stirrup arranged around the reinforcing beam bar.

3. The flat beam support structure according to claim 1 , wherein both ends of the reinforcing beam are fixed within the two internal columns with a predetermined fixing length.

4. A flat beam support structure characterized in that two columns are erected opposite each other to include both widthwise sides of a flat beam extending in the longitudinal direction, a virtual reinforcing beam is formed within the flat beam in which reinforcing beam bars connecting the two opposing columns and reinforcing steel material along the reinforcing beam bars are arranged perpendicular to the main beam bars of the flat beam, and the ends of the flat beam are supported by the two columns and the virtual reinforcing beam within the flat beam.

5. The flat beam support structure according to claim 4 , wherein both ends of the reinforcing steel material are embedded in the two columns with a predetermined anchorage length.

6. The flat beam support structure according to claim 4 or claim 5, wherein a reinforcing plate material is added to a part of the reinforcing steel material.

7. A flat beam support structure characterized in that two columns are erected opposite each other to include both widthwise sides of a flat beam extending in the girder direction, reinforcing beam bars connecting the two opposing columns, and a virtual reinforcing beam is formed within the flat beam at the reinforcing beam bar arrangement position, spanning the width of the flat beam, with hinge relocation reinforcing bars arranged in the main reinforcement direction of the flat beam so as to be perpendicular to the main reinforcement bars of the flat beam, and the ends of the flat beam are supported by the two columns and the virtual reinforcing beam within the flat beam.

8. The flat beam support structure according to any one of claims 4 to 6, wherein a second reinforcing steel material is additionally joined to the reinforcing steel material along the main reinforcement direction of the flat beam.

9. The flat beam support structure according to claim 1 , wherein the beam main reinforcement of the flat beam is arranged only in a range perpendicular to the virtual reinforcing beam position.

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