Support structure for pillar members

Abstract

To provide a support structure allowing upper and lower ends of a column member small in a cross section of a building in a rigid-frame structure to be stably supported for the beam member.SOLUTION: First and second beam members 20A, 20B of a support structure for a column member 11 of a rigid-framed structure of which upper and lower ends of a thin column are supported by the first and second beam member 20A, 20B comprises first and second convex support parts 40 in a curved shape on a support surface of the column member 11, respectively. The column member 11 comprises at the upper and lower ends first and second convex accommodation parts 30 rotatable abutting the first and second convex support parts 40. Pin connections are formed between the first convex support part 40 and the first concave accommodation part 30 and between the second convex support part 40 and the second concave accommodation part 30.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a support structure for column members in the construction of a building, and in particular to a support structure when a thin column member with a small cross section is supported by a beam member serving as a cross member. [Background technology]

[0002] In structures made of rigid frame structures, it is sometimes desirable to use slender columns with small cross sections as some of the columns. However, slender columns yield quickly to horizontal forces such as earthquake forces compared to the column members of normal rigid frame structures, and therefore can only be used in cases where the deformation of the structure itself is small even during an earthquake, such as in seismic isolation structures. Also, even if it is desirable to install a steel column with a small cross section as part of a reinforced concrete column, there is a possibility that vertical deformation will increase due to creep, making it difficult to use a steel column.

[0003] Patent Document 1 discloses small-section columns and a support structure for the columns that support protruding parts such as eaves, eaves, and small roofs connected to a seismically isolated building. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] JP 2006-299710 A Summary of the Invention [Problem to be solved by the invention]

[0005] The pillar disclosed in Patent Document 1 is a pillar for supporting a part protruding from a building, and has a support structure in the form of a pin structure; however, since it is not a pillar member erected between beam members on upper and lower floors of a building or the like made of a rigid frame structure, the mechanical properties of the pillar member as a support structure for beam members are not taken into account.

[0006] Therefore, an object of the present invention is to provide a support structure for column members in buildings, etc., consisting of a rigid frame structure, in which the upper and lower ends of column members with small cross sections are supported by beam members in a manner similar to pin support. [Means for solving the problem]

[0007] In order to achieve the above object, the present invention provides a support structure for a column member of a rigid frame structure, the upper and lower ends of which are supported by first and second beam members, the first and second beam members having curved first and second convex support portions on the support surfaces of the column member, the column member having first and second concave receiving portions at the upper and lower ends which are rotatable while being in sliding contact with the first and second convex support portions, The first beam member The first convex support portion and the Pillar member No. 1 Between the recessed receiving part and the second beam member The second convex support portion and the Pillar members Between the second recessed receiving part and A pin joint is formed.

[0008] It is preferable that the pillar member has a displacement control rod whose upper and lower ends protrude from the first and second concave receiving portions and are inserted and loosely fitted into insertion holes formed in the first and second convex supporting portions.

[0009] It is preferable that the displacement control rod has upper and lower ends, which are inserted and loosely fitted into the first and second convex support portions, retained by nuts.

[0010] It is preferable that the first and second convex support portions are made of a steel plate processed into a convex curved surface, and a reinforcing material is filled in a space surrounded by the convex curved surface of the steel plate.

[0011] The first and second concave receiving portions are preferably curved surfaces having a curvature smaller than the curvature of the first and second convex supporting portions.

[0012] It is preferable that the recess amount of the first and second concave receiving portions is equal to or greater than half the protrusion amount of the first and second convex supporting portions. Effect of the Invention

[0013] According to the present invention, it is possible to provide a support structure for column members that is suitable for reinforcing the structure of a rigid frame structure. [Brief description of the drawings]

[0014] [Figure 1] FIG. 1 is a vertical cross-sectional view showing a support structure for a pole member according to a first embodiment of the present invention. [Diagram 2] FIG. 2 is an enlarged longitudinal sectional view of a portion II in FIG. [Diagram 3] FIG. 11 is a vertical cross-sectional view showing a support structure for a pillar member according to a second embodiment of the present invention. [Figure 4] 1 is an enlarged longitudinal cross-sectional view showing a state in which concrete has been filled into the space between the beam and the protrusion of a protruding support portion attached to a beam member. FIG. [Diagram 5] Each figure shows the relationship between the protrusion amount of the convex support portion and the recess amount of the concave receiving portion, and the curvature of the curved surface of the convex support portion and the curvature of the curved surface of the concave receiving portion. [Figure 6] Each figure shows various column structures that can be used for the column member according to the present invention. [Figure 7] Each figure shows a modified example of the support structure according to the present invention. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0015] The support structure for a pole member of the present invention will be described below with reference to the accompanying drawings. In addition, the same components are given the same reference numerals.

[0016] [First embodiment] 1 and 2 show a supporting state between a steel beam and a reinforced concrete column by a supporting structure for a column member according to a first embodiment of the present invention (FIG. 1) and an enlarged view of supporting portion II in FIG. 1 (FIG. 2).

[0017] The support structure 1 for a column member of the present invention is a structure including a reinforced concrete column member 10 (hereinafter referred to as the column member 10) having concave receiving portions 30, 30 at the upper and lower ends, and a steel beam member 20 (20A, 20B) (hereinafter referred to as the beam member 20 (20A, 20B)) to which the concave receiving portion 30, 30 for accommodating a nut 36 is attached, facing the concave receiving portion 30, 30. As shown in FIG. 1, the column member 10 has a displacement control rod 13, which is arranged as one of the main reinforcements 12 in the center of the column member 10 and has a nut 36 attached to its upper and lower ends, protruding from the concave receiving portions 30, 30 at the upper and lower ends. The beam members 20A, 20B have convex support portions 40, 40 attached to face the concave receiving portions 30, 30 and for accommodating a nut 36. The column member 10 is supported by the beam members 20A, 20B at column-beam joints J1, J2 in which the concave receiving portions 30, 30 are supported by the convex supporting portions 40, 40. When a horizontal force is applied to the column member 10, the concave receiving portions 30, 30 slide and rotate against the convex supporting portions 40, 40, causing a horizontal displacement of a horizontal displacement amount d. Note that before the column member 10 is erected and supported, the beam members 20A, 20B are joined to and supported by two other reinforced concrete columns (not shown) to form a rigid frame structure.

[0018] The column body 11 constituting the column member 10 is a slender column made of precast concrete with main reinforcement bars 12 and hoop reinforcement bars 14 arranged vertically and horizontally, and a displacement control rod 13 is embedded in the center of the cross section so as to penetrate the entire height of the column. The displacement control rod 13 serves to prevent the column member 10 from coming off due to extreme displacement of the beam member 20 when a horizontal force is applied. Nuts 36 are attached to the upper and lower ends of the displacement control rod 13 to prevent it from coming off. The column cross section can be rectangular, circular, or any other suitable cross-sectional shape.

[0019] At the top and bottom ends of the column body 11, a bowl-shaped recess 15 constituting the recessed receiving portion 30 is formed, and the recess 15 protrudes to the deepest part of the recess by a length that allows the displacement control rod 13 to attach a nut 36. The nut 36 is a known nut, and the diagonal distance (outer dimension) is larger than the diameter of the insertion hole 44 of the convex support portion 40 (described later), and the thread pitch is equal to the thread pitch of the joint of the threaded reinforcing bar used in the displacement control rod 13. This makes it possible to prevent the convex support portion 40 from coming off the concave receiving portion 30 when the column member 10 is horizontally displaced with the top and bottom ends supported. The displacement control rod 13 can be made of round steel threaded at both ends, in addition to the threaded reinforcing bar. As long as a predetermined fixing length can be secured, it is not necessary for the rod to have a length that penetrates the entire length of the column body 11. For example, a rod having a length that can resist the pulling force acting on the rod end may be embedded and fixed at the top and bottom ends of the column member 10, respectively. When the expected horizontal displacement of the column member 10 is small, it may not be necessary to provide a displacement control rod.

[0020] The beam members 20 (20A, 20B) are known steel beams, and in this embodiment, H-shaped steel (for example, H-700×300) is used. The beam member 20A has a convex support portion 40 attached to the upper surface of the flange 21, and the beam member 20B has a convex support portion 40 attached to the lower surface of the flange 23. A reinforced concrete floor slab 60 having a predetermined reinforcement arrangement and thickness is poured on the beam member 20A, except for the position of the convex support portion 40 and the position of the reinforced concrete column (not shown) constituting the rigid frame structure, and a seal portion column base cover 70 is formed in the area around the column member where the floor slab 60 is not poured so as to secure a clearance V of more than the horizontal displacement amount d that occurs when the column member 10 is tilted by the horizontal force applied. This seal portion 70 can be deformed following the displacement of the column member 10. It is attached. Between the column base cover 70 and the column member 10, a clearance V is formed that is equal to or larger than the horizontal displacement d that occurs when the column member 10 tilts due to a horizontal force acting at this position.

[0021] The convex support portion 40 is a processed steel plate 41 formed by pressing a steel plate 41 into a convex curved shape, and a convex portion 43 consisting of a curved surface with a curvature approximately equal to the curvature of the concave portion 14 of the concave receiving portion 30 protrudes from the center of a flat base portion 42. This processed steel plate 41 is temporarily attached to the column member 10 side in a state in which the pre-prepared convex portion 43 is fitted into the concave portion 14 of the concave receiving portion 30 of the column member 10. For this reason, it is easy to adjust the gap due to the construction error that occurs when the column member 10 is erected into the beam members 40, 40. In addition, the axial force transmission of the column can be ensured by filling the gap with mortar after erecting the column. In addition, the axial force introduced into the column can be appropriately adjusted by adjusting the timing of filling the gap with mortar. In addition, an insertion hole 44 is formed at the top of the convex portion 43 of the convex support portion 40. After the displacement control rod 13 is inserted into the insertion hole 44 toward the space S and loosely fitted therein, nuts 36 are screwed to both ends of the displacement control rod 13, and the column member 10 is supported rotatably with respect to the convex support part 40. The diameter of the insertion hole 43 is larger than the diameter of the displacement control rod 13, equal to twice the sliding allowable distance d of the column member 10, and smaller than the outer diameter of the nut 36. Also, a mounting hole 45 for inserting a mounting bolt 46 is formed in the base 42. The convex support part 40 is attached to the insertion hole 25 formed at a predetermined position of the beam members 20A and 20B via the mounting bolt 46 and the nut 47 together with the column member 10, and the column member 10 is joined between the beam members 20A and 20B, and the concave receiving parts 30 at the upper and lower ends of the column member 10 are slidably erected so as to be in sliding contact with and rotate relative to the convex support part 40.

[0022] The column-beam joint J1 constituting the support structure of the column member is composed of the concave receiving portion 30, the displacement control rod 13 protruding above the concave receiving portion 30, the nut 36 screwed to the end of the displacement control rod 13, and the convex support portion 40 arranged opposite the concave receiving portion 30. The column-beam joint J2 is composed of the concave receiving portion 30, the displacement control rod 13 protruding below the concave receiving portion 30, the nut 36 screwed to the end of the displacement control rod 13, and the convex support portion 40 arranged opposite the concave receiving portion 30. Therefore, when the column member 10 is displaced horizontally so as to tilt due to a horizontal force, the concave receiving portion 30 slides and rotates at the portion where it contacts the convex support portion 40 so that the column member 10 moves horizontally between the beam members 20A and 20B by the horizontal displacement amount distance d due to the column-beam joints J1 and J2.

[0023] [Second embodiment] 3 shows a state in which a reinforced concrete column is supported by a support structure for a column member according to a second embodiment of the present invention. The support structure for a column member 2 differs from the first embodiment in that the beams to which the convex support portions 40, 40 are attached are reinforced concrete beam members 50 (50A, 50B) (hereinafter, RC beam members 50 (50A, 50B)).

[0024] The column member 10 is the same as that in the first embodiment. The RC beam members 50A and 50B have main reinforcement and stirrup reinforcement (not shown) arranged vertically and horizontally at a predetermined interval. The RC beam member 50A has a convex support portion 40 attached to the upper surface, and the RC beam member 50B has a convex support portion 40 attached to the lower surface.

[0025] A reinforced concrete floor slab 60 having a predetermined reinforcing bar arrangement and thickness (not shown) is poured into the upper surfaces of the RC beam members 50A and 50B, or at the same height as the upper surfaces of the beams. Holes are drilled in the upper part of the RC beam member 50A and in the floor slab 60 to form cap nut anchors 48 for attaching the convex support portion 40A to the RC beam member 50A. Holes are also drilled in the lower part of the RC beam member 50B to form cap nut anchors 48 for attaching the convex support portion 40A to the RC beam member 50B.

[0026] The convex support portion 40A is attached to the RC beam members 50A, 50B by attaching a bolt 49 to the mounting hole 45 and the cap nut anchor 48. The convex portion 43 is temporarily attached to the column member 10 in a state where it is fitted into the recess 14 of the recessed receiving portion 30 of the column member 10. Even in this embodiment, it is easy to adjust gaps caused by construction errors that occur when erecting the column member 10 on the beam member 51 or floor slab 60, and the axial force transmission of the column can be ensured by filling the gaps with mortar after erecting the column.

[0027] The column-beam joint J3 constituting the support structure of the column member is composed of the concave receiving portion 30, the displacement control rod 13 protruding above the concave receiving portion 30, the nut 36 screwed to the end of the displacement control rod 13, and the convex support portion 40A arranged opposite the concave receiving portion 30. The column-beam joint J4 is composed of the concave receiving portion 30, the displacement control rod 13 protruding below the concave receiving portion 30, the nut 36 screwed to the end of the displacement control rod 13, and the convex support portion 40A arranged opposite the concave receiving portion 30. Therefore, when the column member 10 is subjected to horizontal deformation, the column-beam joints J3 and J4 allow the column member 10 to slide and rotate horizontally between the RC beam members 50A and 50B by the allowable sliding distance d. Therefore, when the column member 10 is horizontally displaced and tilted due to a horizontal force, the column-beam joints J3, J4 cause the column member 10 to move horizontally between the RC beam members 50A, 50B by a horizontal displacement distance d, so that the concave receiving portion 30 slides and rotates at the point where it comes into contact with the convex supporting portion 40.

[0028] As described above, according to the first and second embodiments, the concave receiving portions 30, 30 are formed at the upper and lower ends of the column member 10, and are supported in a rotatable and slidable manner in sliding contact with the convex supporting portions 40, 40 (40A, 40A) attached to the beam members 20, 20 (50, 50) that constitute the rigid frame structure. Therefore, even if the column member 10 is subjected to horizontal deformation, the column member 10 displaces and slides horizontally, minimizing the occurrence of bending moment, and a slender column based on a normal earthquake-resistant design (route 3) can be used for the column member 10.

[0029] In addition, because the column members 10 can be made thin to support only long-term loads, the beams can be made smaller, the floor height can be compressed, construction efficiency can be improved, and costs can be reduced. By using the column members 10 only in areas where it is desired to ensure a higher ceiling height than other areas, there is no need to make the floor height of other areas extra high.

[0030] [Variations] In the above first and second embodiments, the space S between the convex portion 43 of the convex support portion 40, 40A and the beam member 20 or the RC beam member 50 is hollow, but as shown in Fig. 4, the convex portion 43 of the convex support portion 40B may be filled with reinforcing mortar M having a predetermined strength equivalent to the concrete strength of the column member 10. This allows the column beam joint J5 to support the axial force when the entire cross section of the column member 10 is effective, and allows for a greater transmission of axial force than the column beam joints J1 to J4.

[0031] In the first and second embodiments, as shown in FIG. 5(a), the recess 15 is formed at a part of the end of the column member 10 with a curved surface having a curvature substantially equal to that of the opposing protrusion 43. However, as shown in FIG. 5(b), the recess 15 may be formed with a curved surface having a curvature smaller than that of the opposing protrusion 43 over the entire end of the column member 10B. If a recess having a recess amount of at least half the protrusion amount of the protrusion 43 is formed, it is possible to prevent the column from coming off. It is not preferable to form the column member 10C in which the recess 15B having a recess amount less than half the protrusion amount of the protrusion 43 is formed as shown in FIG. 5(c). In addition, the rotational rigidity can be adjusted by changing the curvature of the recess (or the recess and the protrusion). When the curvature of the recess and the protrusion is substantially equal, the rotational rigidity is large, and the rotational rigidity is reduced as the curvature of the recess is smaller than that of the protrusion. Although the convex portion 43 is formed in a hemispherical shape, it may be formed in a shallower bowl shape than a hemisphere, for example, so as to correspond to the concave portion 15A in FIG. 5(b).

[0032] In the first and second embodiments, the column member 10 was made of reinforced concrete, but for example, as shown in Figures 6(a) to (c), a steel concrete column 80, a CFT column with built-in reinforcing bars 90, a CFT column 100, etc. may also be used.

[0033] In the first and second embodiments, as shown in FIG. 5(a), the end of the pillar member 10 is formed into a bowl-shaped recess 15, and the convex portion 43 of the convex support portion is formed into a hemispherical shape. However, for example, as shown in FIGS. 7(a), (b), and (c), it is preferable that the end of the pillar member 10D is formed into a dish-shaped recess 15C that is shallower than a bowl shape, and the convex portion 43A of the convex support portion 40B is formed into a gentle convex shape corresponding to this, or the end of the pillar member 10E is formed into a concave spherical recess 15D, and the convex portion 43B of the convex support portion 40C is formed into a pillar shape with a convex curved upper surface, or the end of the pillar member 10F is formed into a flat conical recess 15E, and the convex portion 43C of the convex support portion 40D is formed into a conical shape corresponding to the recess 15E.

[0034] By adjusting the roughness of the curved surface of the concave and convex portions in the first and second embodiments, or by using a low-friction material such as Teflon (registered trademark) or stainless steel for the concave and convex portions, it is possible to adjust the area of ​​the contact surface between the concave and convex portions or to minimize the contact surface.

[0035] 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, embodiments obtained by combining technical means appropriately modified within the scope of the claims are also included in the technical scope of the present invention. [Explanation of symbols]

[0036] 1,2 Support structure 10, 10A, 10B, 10C, 10D, 10E, 10F Reinforced concrete column members (column members) 11 Pillar body 12 Main reinforcement 13 Displacement control rod 15, 15A, 15B, 15C, 15D recess 20, 20A, 20B Steel beam members (beam members) 30, 30A, 30B, 30C, 30D, 30E, 30F Concave receiving part 36,47 Nut 40,40A,40B,40C,40D Convex support part 41 Steel plate 42 Base 43, 43A, 43B, 43C Convex part 44 Insertion hole 45 Mounting hole 46, 49 Mounting bolts 48 Cap nut anchor 50, 50A, 50B Reinforced concrete beams (RC beams) 51 Beam body 60 Floor slab 70 Column base cover 80 Steel concrete pillar 90 Reinforced concrete tubular column 100 CFT columns J1,J2,J3,J4,J5 Column beam joint S space V Clearance

Claims

1. A support structure for a column member of a rigid frame structure, in which upper and lower ends of the column member are supported by first and second beam members, The first and second beam members have first and second curved convex support portions on the support surfaces of the column members, the pillar member has first and second concave receiving portions at upper and lower ends thereof, the first and second concave receiving portions being rotatable while being in sliding contact with the first and second convex supporting portions, A pin joint is formed between the first convex support portion of the first beam member and the first concave receiving portion of the column member, and between the second convex support portion of the second beam member and the second concave receiving portion of the column member. A support structure for a pillar member.

2. 2. A support structure for a pillar member as described in claim 1, wherein the pillar member has a displacement control rod whose upper and lower ends protrude from the first and second concave receiving portions and are inserted and loosely fitted into insertion holes formed in the first and second convex support portions.

3. 3. The support structure for a column member according to claim 2, wherein the displacement control rod has upper and lower ends inserted and loosely fitted into the first and second convex support portions and held by nuts.

4. The first and second convex support portions are made of steel plates processed into a convex curved shape, The support structure for a column member according to any one of claims 1 to 3, wherein a reinforcing material is filled into a space surrounded by the convex curved surface of the steel plate.

5. 5. The support structure for a column member according to claim 1, wherein the curvature of the first and second concave receiving portions is smaller than the curvature of the first and second convex supporting portions.

6. 6. The support structure for a column member according to claim 1, wherein the recessed amount of the first and second concave receiving portions is equal to or greater than half the protruding amount of the first and second convex supporting portions.

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