column-beam structure

Abstract

To provide a column-beam groove which can be easily joined to a steel pipe column with a high joint strength, and can freely adjust a beam length in accordance with a span length.SOLUTION: A column-beam groove 1 includes a pair of CFT columns 30, an intermediate synthetic beam 40A and an upper side synthetic beam 40B for connecting the pair of CFT columns 30, and a reinforced concrete wall 50 provided between the pair of CFT columns 30. The intermediate synthetic beam 40A and the upper side synthetic beam 40B include a pair of end steel materials 41 joined to the CFT columns 30, a central part reinforcement 42 for connecting the pair of end steel materials 41, and a concrete body 45 where the end steel materials 41 and the central part reinforcement 42 are embedded.SELECTED DRAWING: Figure 4

Description

[Technical Field]

[0001] The present invention relates to a composite beam-column frame comprising steel pipe columns and reinforced concrete walls. [Background technology]

[0002] BACKGROUND ART Joint structures between steel columns and reinforced concrete walls have been known in the past (see Patent Documents 1 to 3). Patent Document 1 discloses a steel pipe column structure having a steel pipe column and a seismic wall joined to the steel pipe column. The steel pipe column is thickened at a location where the strut stress of the seismic wall acts. Patent Document 2 shows a joint structure between a reinforced concrete earthquake-resistant wall and a steel pipe column. Shear force transmission members such as stud bolts and channel members are protruding from the outer surface of the steel pipe column, and these shear force transmission members are embedded in the concrete of the earthquake-resistant wall. The steel pipe column is a concrete-filled steel pipe column, with concrete filled inside.

[0003] Patent Document 3 shows a joint structure between an H-shaped steel column and an RC shear wall. A plurality of shear force transmission members are provided on the web of the H-shaped steel column, and these shear force transmission members are embedded in the RC shear wall. Patent Document 4 shows a wall structure including an RC column and a pair of steel beams connected to the upper end of the RC column and arranged at an appropriate interval in the horizontal direction. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Laid-Open No. 2000-352153 [Patent Document 2] Japanese Patent Application Publication No. 11-324108 [Patent Document 3] Japanese Patent Application Laid-Open No. 2002-227327 [Patent Document 4] Japanese Patent Application Publication No. 06-129042 Summary of the Invention [Problem to be solved by the invention]

[0005] An object of the present invention is to provide a beam-column structure that can be easily joined to a steel pipe column with high joining strength and that allows the beam length to be freely adjusted to match the span length. [Means for solving the problem]

[0006] The inventors arrived at the present invention by noticing that in a steel frame structure including a reinforced concrete wall, by connecting a pair of steel pipe columns with a composite beam comprising end steel members with flanges and a central steel member, the beam length can be freely adjusted according to the span length, and the steel pipe column and composite beam can be joined with high joining strength. The beam-column structure of the first invention (for example, the beam-column structure 1 described below) is a composite beam-column structure comprising steel pipe columns (for example, the CFT column 30 described below) and reinforced concrete walls (for example, the reinforced concrete wall 50 described below), and is characterized in that it comprises a pair of steel pipe columns, a beam connecting the pair of steel pipe columns (for example, the intermediate composite beam 40A and upper composite beam 40B described below), and a reinforced concrete wall provided between the pair of steel pipe columns, and the beam comprises a pair of end steel materials (for example, the end steel material 41 described below) having flanges (for example, the flanges 46 described below) joined to the steel pipe columns, a central steel material connecting the pair of end steel materials (for example, the central reinforcing bar 42 and web 47 described below), and a concrete body in which the end steel materials and the central steel material are embedded (for example, the concrete body 45 described below).

[0007] According to this invention, a composite structure including steel pipe columns and reinforced concrete walls is constructed by connecting a pair of steel pipe columns with a composite beam including end steel members and a central steel member. Therefore, because the end steel members at the beam ends are joined to the steel pipe columns, the beam and the steel pipe column can be easily joined with high joining strength. Furthermore, the composite beam connecting a pair of steel pipe columns is relatively easy to construct, since it is sufficient to form a concrete body so as to cover the end steel members and the central steel members. Furthermore, when reinforcing bars are used as the central steel material, steel material with flanges is placed only at the ends of the beam, rather than being placed along the entire length of the beam, so the beam length can be freely adjusted to match the span length, increasing the freedom of building design.

[0008] The column-beam structure of the second invention is characterized in that at least one of the two sides of the concrete body of the beam is located flush with the wall surface of the reinforced concrete wall or inside the wall surface of the reinforced concrete wall. According to this invention, at least one side of the beam is positioned flush with the surface of the reinforced concrete wall or positioned inside the surface of the reinforced concrete wall. Therefore, the beam does not protrude from the surface of the reinforced concrete wall, realizing a user-friendly indoor or outdoor space.

[0009] The column-beam structure of the third invention is characterized in that the vertical reinforcement of the reinforced concrete wall is fixed to the concrete body of the beam by either the ends of the vertical reinforcement being located inside the concrete body of the beam or by the vertical reinforcement penetrating the concrete body of the beam. According to this invention, the vertical reinforcement of the reinforced concrete wall is fixed to the concrete body of the beam by positioning the end of the vertical reinforcement inside the concrete body of the beam or by passing the vertical reinforcement through the concrete body of the beam. Therefore, the vertical reinforcement of the reinforced concrete wall can be fixed to the concrete body of the beam without any special processing of the vertical reinforcement of the reinforced concrete wall, and a strong composite structure can be realized.

[0010] The fourth invention is a beam-column structure characterized in that the end steel material comprises an H-shaped steel and a stiffening plate extending along the web of the H-shaped steel or in a direction intersecting the web, and the central reinforcing bar is joined to the stiffening plate. According to this invention, a stiffening plate is provided on the H-section steel and the central reinforcing bar is joined to this stiffening plate, so that the stiffening plate can improve the rigidity of the end steel material. [Effects of the Invention]

[0011] According to the present invention, a column-beam frame can be provided that can be easily joined to a steel pipe column with high joining strength and that allows the beam length to be freely adjusted to match the span length. [Brief explanation of the drawings]

[0012] [Figure 1] FIG. 1 is a side view of a beam-column structure according to a first embodiment of the present invention. [Figure 2] 2A and 2B are a side view and a cross-sectional view showing the arrangement of reinforcement in a reinforced concrete wall of a beam-column frame according to the first embodiment. [Figure 3] 2. FIG. 3 is a cross-sectional view of the beam-column structure 1 taken along line II-II in FIG. [Figure 4] FIG. 2 is a side view showing the structure of a composite beam of a beam-column frame according to the first embodiment. [Figure 5] FIG. 5 is an enlarged view of the portion (intermediate composite beam) surrounded by the dashed line A of the column-beam frame in FIG. [Figure 6] 6A and 6B are cross-sectional views of the intermediate composite beam of FIG. 5 along lines III-III and IV-IV. [Figure 7] FIG. 4 is an enlarged view of the portion of the beam-column frame enclosed by the dashed line B in FIG. 3. [Figure 8] FIG. 2 is a schematic diagram showing a stress transfer mechanism when an earthquake force acts on the beam-column frame according to the first embodiment. [Figure 9] 1 is a partially enlarged view (intermediate composite beam) of a beam-column frame according to a first embodiment of the present invention. [Figure 10] 10A and 10B are cross-sectional views of the intermediate composite beam of FIG. 9 along lines VV and VI-VI. [Figure 11] 10 is a partially enlarged view (intermediate composite beam) of a beam-column frame according to a second embodiment of the present invention. [Figure 12] 12A and 12B are cross-sectional views of the intermediate composite beam shown in FIG. 11 along lines VII-VII and VIII-VIII. [Figure 13] 10 is a partially enlarged view (intermediate composite beam) of a beam-column frame according to a second embodiment of the present invention. [Figure 14] 14A and 14B are cross-sectional views of the intermediate composite beam of FIG. 13 along line IX-IX and line XX. [Figure 15]FIG. 10 is a partially enlarged view of a beam-column frame according to a modified example of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0013] The present invention relates to a composite beam-column frame comprising a pair of steel pipe columns and a reinforced concrete wall that constitute the building skeleton, located on the ground floor of a building or on the basement floor of a building where steel pipe columns are used as structural columns. The feature of the beam-column frame of the present invention is that the composite beam connecting the pair of steel pipe columns comprises a pair of end steel members having flanges joined to the steel pipe columns, a central steel member connecting the pair of end steel members, and a concrete body covering the end steel members and the central steel member. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings. In the following description of the embodiments, the same components will be denoted by the same reference numerals, and the description thereof will be omitted or simplified. [First embodiment] Fig. 1 is a side view of a beam-column structure 1 according to a first embodiment of the present invention. Fig. 2(a) is a side view showing the arrangement of reinforcement in a reinforced concrete wall 50 of the beam-column structure 1. Fig. 2(b) is a cross-sectional view taken along line II of the beam-column structure 1 in Fig. 2(a). Fig. 3 is a cross-sectional view taken along line II-II of the beam-column structure 1 in Fig. 2(a). The column-beam structure 1 comprises a pair of reinforced concrete cast-in-place piles 10, a reinforced concrete foundation beam 20 installed on the pair of cast-in-place piles 10, a pair of CFT columns 30 as steel pipe columns installed on the foundation beam 20 with their lower ends embedded in the cast-in-place piles 10, an intermediate composite beam 40A located directly above the foundation beam 20 and connecting the pair of CFT columns 30, an upper composite beam 40B located directly above the intermediate composite beam 40A and connecting the pair of CFT columns 30, and a reinforced concrete wall 50 (shown by diagonal lines in Figure 1) installed between the pair of CFT columns 30.

[0014] Fig. 4 is a side view showing the structure of the intermediate composite beam 40A and upper composite beam 40B of the beam-column frame 1. Fig. 5 is an enlarged view of the portion (intermediate composite beam 40A) surrounded by dashed line A of the beam-column frame 1 in Fig. 4. Fig. 6(a) is a cross-sectional view taken along III-III of the intermediate composite beam 40A in Fig. 5. Fig. 6(b) is a cross-sectional view taken along IV-IV of the intermediate composite beam 40A in Fig. 5. Fig. 7 is an enlarged view of the portion surrounded by dashed line B of the beam-column frame 1 in Fig. 3. Note that in Figs. 4 and 5, the beam reinforcement 43 and stirrups 44 are omitted for ease of understanding. As shown in Figure 7, a CFT (Concrete Filled Steel Tube) column 30 comprises a steel pipe 31, which is a square steel pipe, and a concrete body 32 formed by filling the inside of the steel pipe 31 with concrete. Stud materials 33 are provided in two rows vertically on the side surface of the CFT column 30, which is the joint surface with the reinforced concrete wall 50. The lower end of the CFT column 30 penetrates the foundation beam 20 and is embedded in a cast-in-place pile 10.

[0015] Below, the intermediate composite beam 40A will be explained, but the upper composite beam 40B has the same configuration as the intermediate composite beam 40A. The intermediate composite beam 40A comprises end steel members 41 which are a pair of H-shaped steel members welded to the steel pipes 31 of a pair of CFT columns 30, central reinforcing bars 42 which are ten central steel members connecting the pair of end steel members 41, four beam reinforcement bars 43 arranged along the entire length of the intermediate composite beam 40A, closed stirrups 44 arranged at predetermined intervals surrounding the end steel members 41 and the central reinforcing bars 42, and a concrete body 45 in which the end steel members 41, central reinforcing bars 42, beam reinforcement bars 43, and stirrups 44 are embedded. The end steel material 41 includes flanges 46 arranged above and below, extending horizontally, and a web 47 that connects these flanges 46 and extends vertically. Five couplers 48, which are long nuts, are welded to each side of the web 47 of the end steel material 41. The central reinforcing bar 42 is a deformed reinforcing bar with male threads formed on both ends, and both ends of the central reinforcing bar 42 are screwed into these couplers 48. This connects the central reinforcing bar 42 to the web 47 of the end steel material 41. In addition, the beam reinforcement 43 is not fixed to the CFT column 30.

[0016] The reinforced concrete wall 50 is provided in a space surrounded by the foundation beam 20, a pair of CFT columns 30, and the upper composite beam 40B, and the intermediate composite beam 40A is located at the middle height of the reinforced concrete wall 50. Both side surfaces of the concrete bodies 45 of the composite beams 40A and 40B are flush with the wall surface of the reinforced concrete wall 50. As shown in Figure 7, a reinforced concrete wall 50 is double-reinforced with vertical reinforcement 51 and horizontal reinforcement 52. At both ends of the horizontal reinforcement 52 of this reinforced concrete wall 50, a roughly U-shaped wall reinforcing bar 53 is attached with a lap joint, straddling the double-reinforced horizontal reinforcement 52. In addition, width stop bars 54 are provided at the four corners of the reinforced concrete wall 50 (the areas indicated by dashed lines R in Figure 2(a)). In addition, the double-reinforced vertical bars 51 of the reinforced concrete wall 50 have their lower ends fixed to the foundation beam 20, pass through the concrete body 45 of the intermediate composite beam 40A, and have their upper ends fixed within the concrete body 45 of the upper composite beam 40B.

[0017] According to the above-described column-beam structure 1, as shown in Figure 8, when an earthquake force H is applied, the concrete compression bundles P1 at the upper part of the reinforced concrete wall 50 (the part above the intermediate composite beam 40A), the concrete compression bundles P2 at the lower part of the reinforced concrete wall 50 (the part below the intermediate composite beam 40A), and the compression bundles PA of the entire reinforced concrete wall 50 resist this horizontal force H. At this time, tensile force acts on the composite beams 40A and 40B, but since the end steel material 41 and the central reinforcing bar 42 are connected using the coupler 48, the tensile force is reliably transmitted in the order of the CFT column 30, end steel material 41, coupler 48, and central reinforcing bar 42.

[0018] Furthermore, since the end steel members 41 of the composite beams 40A and 40B are fixed to the reinforced concrete wall 50, the concrete between the flanges has a stiffening effect against the bearing resistance of the end steel members 41 of the composite beams 40A and 40B. Furthermore, the end steel members 41 of the composite beams 40A and 40B function as flange bearing and tension members, thereby contributing to the formation of compression beams P1 and P2 in each layer. Furthermore, the vertical reinforcement 51 of the reinforced concrete wall 50 is fixed to the composite beams 40A and 40B, thereby contributing to the formation of the overall compression beam PA. Furthermore, considering that the compressive strength of the concrete in contact with the flange surface of the end steel material 41 increases due to bearing pressure, it is preferable that the flange width T of the end steel material 41 be at least 1 / 3 of the wall thickness W, as shown in Figure 6. Furthermore, considering that the compressive strength of the concrete in contact with the flange surface of the end steel material 41 increases due to bearing pressure, it is preferable that the wall thickness W of the reinforced concrete wall be approximately 1 / 3 to 2 / 3 of the width D of the CFT column 30, as shown in Figure 7.

[0019] According to this embodiment, the following effects are obtained. (1) As a composite structure comprising CFT columns 30 and reinforced concrete walls 50, a pair of CFT columns 30 are connected by composite beams 40A, 40B equipped with end steel members 41 and central reinforcing bars 42. By joining the end steel members 41 at the beam ends to the steel pipes 31 of the CFT columns 30, the composite beams 40A, 40B can be joined to the CFT columns 30 easily with high joining strength. In addition, the beam length of the composite beams 40A, 40B can be easily adjusted, allowing for greater freedom in building design. (2) Instead of placing steel materials along the entire length of the composite beams 40A and 40B, end steel materials 41 are placed only at the ends of the composite beams 40A and 40B, so the beam length can be freely adjusted to match the span length, making it easy to install.

[0020] (3) Both sides of the composite beams 40A, 40B are flush with the surface of the reinforced concrete wall 50. Therefore, the beam shapes of the composite beams 40A, 40B do not protrude from the surface of the reinforced concrete wall 50, realizing a user-friendly indoor or outdoor space. (4) The ends of the vertical reinforcement 51 of the reinforced concrete wall 50 are positioned inside the concrete body 45 of the composite beam 40B, and the vertical reinforcement 51 penetrates the concrete body 45 of the composite beam 40A, thereby fixing the vertical reinforcement 51 of the reinforced concrete wall 50 to the concrete bodies 45 of the composite beams 40A and 40B. Therefore, without any special processing of the vertical reinforcement 51 of the reinforced concrete wall 50, the vertical reinforcement 51 of the reinforced concrete wall 50 can be fixed to the concrete bodies 45 of the composite beams 40A and 40B, and a strong composite structure can be realized.

[0021] [ First reference example 〕 FIG. 9 shows the present invention First reference example 10(a) is a partial enlarged view (intermediate composite beam 60) of the beam-column structure 1A according to the present invention. Fig. 10(a) is a VV cross-sectional view of the intermediate composite beam 60 of Fig. 9. Fig. 10(b) is a VI-VI cross-sectional view of the intermediate composite beam 60 of Fig. 9. Note that in Fig. 9, the beam reinforcement 43 and stirrup reinforcement 44 are omitted for ease of understanding. Book Reference example The second embodiment differs from the first embodiment in that the central reinforcing bar 42 is joined to the flange 46 of the end steel material 41, but the other configurations are the same as those of the first embodiment. That is, three couplers 48, which are long nuts, are welded and fixed to each of the upper surface of the upper flange 46 and the lower surface of the lower flange 46 of the end steel material 41. The central reinforcing bar 42 is a deformed reinforcing bar with male threads formed on both ends, and both ends of the central reinforcing bar 42 are screwed into these couplers 48. Book Reference example According to the above, the same effects as those of (1) to (4) can be obtained.

[0022] [ Second reference example 〕 FIG. 11 shows the method of the present invention. Second reference example 12(a) is a partial enlarged view (intermediate composite beam 70) of the beam-column structure 1B according to the present invention. Fig. 12(a) is a cross-sectional view of the intermediate composite beam 70 of Fig. 11 taken along VII-VII. Fig. 12(b) is a cross-sectional view of the intermediate composite beam 70 of Fig. 11 taken along VIII-VIII. Note that in Fig. 11, the beam reinforcement 43 and the stirrup reinforcement 44 are omitted for ease of understanding. This reference exampleIn this embodiment, the configuration of the end steel material 71 is different from that of the first embodiment, but the other configurations are the same as those of the first embodiment.

[0023] That is, the end steel material 71 includes an H-shaped steel 72 consisting of a flange 46 and a web 47, and a stiffening plate 73 extending in a direction intersecting the flange 46 and the web 47 of the H-shaped steel 72. The length L of this end steel material 71 can be made shorter than the length of the end steel material 41. Ten nuts 74 are welded and fixed to the beam end side of the stiffening plate 73, and both ends of the central reinforcing bar 42 pass through the stiffening plate 73 and are screwed into the nuts 74. In this way, the central reinforcing bar 42 is joined to the stiffening plate 73 of the end steel material 41. Book Reference example According to the method, in addition to the above (1) to (4), the following effects are obtained. (5) The stiffening plate 73 is provided on the H-shaped steel 72 and the central reinforcing bar 42 is joined to this stiffening plate 73, so that the stiffening plate 73 can improve the rigidity of the end steel material 71.

[0024] [No. 2 Embodiment FIG. 13 shows the structure of the present invention. 2 14A and 14B are enlarged partial views (intermediate composite beam 80) of the beam-column structure 1C according to the embodiment. Fig. 14A is a cross-sectional view of the intermediate composite beam 80 taken along line IX-IX in Fig. 13. Fig. 14B is a cross-sectional view of the intermediate composite beam 80 taken along line XX in Fig. 13. Note that in Fig. 13, the beam reinforcement 43 and stirrups 44 are omitted for ease of understanding. In this embodiment, the configuration of the central portion of the intermediate composite beam 80 is different from that of the first embodiment, but the other configurations are the same as those of the first embodiment. That is, in the center of the intermediate composite beam 80, no center reinforcing bar is provided, and the web 47 of the end steel material 41 is extended. According to this embodiment, the same effects as those of (1), (3), and (4) above are obtained.

[0025] The present invention is not limited to the above-described embodiment, and modifications and improvements within the scope of achieving the object of the present invention are included in the present invention. For example, in each of the above-described embodiments, the central reinforcing bar 42 is joined to the end steel material 41 via a coupler 48 or nut 74, which is a long nut, but this is not limited to this, and the central reinforcing bar 42 may be directly welded and fixed to the end steel material 41. In the first embodiment described above, both side surfaces of the composite beams 40A, 40B are flush with the wall surface of the reinforced concrete wall 50, but this is not limiting. For example, as a modified example, as shown in Fig. 15, the side surface C1 of the concrete body 45 of the composite beams 40A, 40B on the building interior side (room side) may be flush with the wall surface of the reinforced concrete wall 50, and the side surface C2 on the building exterior side may protrude outward from the wall surface of the reinforced concrete wall 50. Alternatively, the side surface of the composite beams 40A, 40B on the building interior side (room side) may be positioned more inward than the wall surface of the reinforced concrete wall 50.

[0026] Furthermore, in each of the above-described embodiments, the lower part of the reinforced concrete wall 50 is joined to the foundation beam 20, but this is not limiting, and the lower part of the reinforced concrete wall 50 may also be joined to a beam on an intermediate floor of the building. Furthermore, in each of the above-described embodiments, there is one intermediate composite beam 40A located at the mid-height of the reinforced concrete wall 50, but this is not limited to this, and multiple intermediate composite beams located at the mid-height of the reinforced concrete wall may be provided. Furthermore, in each of the above-described embodiments, the height position of the intermediate composite beam 40A is set to approximately the center of the reinforced concrete wall 50, but the height position of the intermediate composite beam 40A is not particularly limited. In addition, in each of the above-mentioned embodiments, an intermediate composite beam 40A is provided at the mid-height of the reinforced concrete wall 50, and an upper composite beam 40B is provided at the upper end of the reinforced concrete wall 50, but this is not limited to this, and only an intermediate composite beam or an upper composite beam member may be used. [Explanation of symbols]

[0027] 1, 1A, 1B, 1C...Column beam frame 10...Cast-in-place piles 20...Foundation beam 30...CFT column (steel pipe column) 31...Steel pipe 32...Concrete body 33...Stud material 40A…Middle composite beam 40B…Upper composite beam 41…End steel material 42...Central reinforcing bar (central steel material) 43...Beam bar 44...Stirrups 45...Concrete body 46...Flange 47...Web (central steel) 48...Coupler 50...Reinforced concrete wall 51...Vertical reinforcement 52...Horizontal reinforcement 53...Wall reinforcement 54...Width stop line 60…Intermediate composite beam 70…Intermediate composite beam 71…End steel 72…H-shaped steel 73...Stiffening plate 74...Nut

Claims

1. A composite beam-column frame having steel pipe columns and reinforced concrete walls, A pair of steel pipe columns; A beam connecting the pair of steel pipe columns; a reinforced concrete wall provided between the pair of steel pipe columns, The beam comprises a pair of end steel materials provided on the pair of steel pipe columns, a central steel material connecting the pair of end steel materials, and a concrete body in which the end steel materials and the central steel material are embedded, The pair of end steel materials each include a pair of upper and lower flanges joined to the steel pipe column, and a web joined to the steel pipe column to connect the upper and lower flanges, A beam-column structure characterized in that the central steel material is a central reinforcing bar connecting the webs of the pair of end steel materials, or an extension of the webs of the end steel materials.

2. The beam-column structure according to claim 1, characterized in that at least one of the two sides of the concrete body of the beam is flush with the wall surface of the reinforced concrete wall or is located inside the wall surface of the reinforced concrete wall.

3. The beam-column structure according to claim 1 or 2, characterized in that the vertical reinforcement of the reinforced concrete wall is fixed to the concrete body of the beam by having the ends of the vertical reinforcement located inside the concrete body of the beam, or by having the vertical reinforcement penetrate the concrete body of the beam.

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