Support construction

Abstract

The objective is to provide a support structure that can achieve both earthquake resistance and aesthetic design. [Solution] A support structure 1 that supports a steel frame roof (superstructure) 4 by a column (lower structure) 3, wherein support parts 20 are provided at least three locations that are not on the same straight line between the column 3 and the steel frame roof 4, and the support part 20 has a lower shoe part 21 fixed to the column 3 and having an upward concave lower spherical surface 21a, and an upper shoe part 22 fixed to the steel frame roof 4 and having a downward convex upper spherical surface 22a that is in contact with the lower spherical surface 21a.

Description

Technical Field

[0001] The present invention relates to a support structure in which an upper structure is supported by a lower structure.

Background Art

[0002] Conventionally, as a support structure in which an upper structure is supported by a lower structure, a seismic isolation bearing is provided between the lower floor part (lower structure) and the upper floor part (upper structure) of a building to seismically isolate and support the upper floor part by the lower floor part (for example, Patent Document 1), or a beam constituting a roof (upper structure) is rigidly joined by welding on a plurality of columns (lower structures) to support the roof by the columns. Various configurations are known.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] However, for example, when the upper structure is a highly designed steel structure roof using relatively thin steel materials and this steel structure roof is supported by a plurality of columns as the lower structure, in a configuration where the steel materials of the steel structure roof are welded to the columns for rigid joining, the joint portion between the columns and the steel structure roof cannot withstand the horizontal load during an earthquake, and it has been difficult to achieve both seismic resistance and designability.

[0005] [[ID=_{38}]] The present invention has been made in view of such problems, and an object thereof is to provide a support structure capable of achieving both seismic resistance and designability.

Means for Solving the Problems

[0006] The support structure of the present invention is a support structure in which a lower structure supports an upper structure, wherein support portions are provided at least three locations that are not on the same straight line between the lower structure and the upper structure, and the support portion has a lower shoe portion fixed to the lower structure and having an upwardly concave lower spherical surface, and an upper shoe portion fixed to the upper structure and having a downwardly convex upper spherical surface in contact with the lower spherical surface.

[0007] In the support structure of the present invention, it is preferable that the upper shoe portion has a connecting portion with a joint surface at its upper end that is fixed to the upper structure, and a spherical portion with a larger diameter than the connecting portion that is connected to the lower end of the connecting portion, and that a plurality of stopper members, each with an arc shape whose inner circumferential surface is larger in diameter than the connecting portion and smaller in diameter than the spherical portion, are fixed to the upper surface of the lower shoe portion.

[0008] In the support structure of the present invention, it is preferable that the upper sphere has a shape that satisfies θd > θ + 1 / 2 × α, where θd is the angle from the lower end to the outer edge of the upper sphere centered on the center point of the upper sphere, θ is the angle made with respect to the vertical direction by the resultant force of the weight of the superstructure and the maximum horizontal force expected to be input during an earthquake, and α is the expected load transmission range centered on the center point. [Effects of the Invention]

[0009] According to the present invention, it is possible to provide a support structure that can achieve both earthquake resistance and aesthetic design. [Brief explanation of the drawing]

[0010] [Figure 1] This is a front view of a building having a support structure according to one embodiment of the present invention. [Figure 2] Figure 1 is a cross-sectional view showing the details of the section of the building where the support structure is located. [Figure 3] This is a cross-sectional view along line AA in Figure 2. [Figure 4] This figure shows angles θ, θd, θn, assumed load transmission range α, and eccentricity distance e. [Figure 5] This figure shows the resultant force F, which is the difference between the weight NL and the maximum horizontal force NE. [Modes for carrying out the invention]

[0011] The following describes in detail an example of a support structure according to one embodiment of the present invention, with reference to the drawings.

[0012] The building 1 shown in Figure 1 employs a support structure 10 according to one embodiment of the present invention. More specifically, the building 1 has a plurality of columns 3 as a substructure supported by a foundation 2, and a steel frame roof 4 as a superstructure positioned above the columns 3, with the steel frame roof 4 being supported by the plurality of columns 3 via the support structure 10.

[0013] In this embodiment, the column 3 is formed from a circular steel pipe and is supported at its lower end by the foundation 2. Although only three columns 3 arranged in a straight line are shown in Figure 1, the building 1 has several other columns 3 that are offset in the plane of the paper from the columns 3 shown in Figure 1, and the steel roof 4 is supported by these several columns 3 and held in a horizontal position.

[0014] Furthermore, the columns 3 are not limited to circular steel pipes; they may be of other shapes, such as square steel pipes, and may be made of other materials or structures, such as precast concrete. In addition, as long as at least three columns 3 are provided to support the steel frame roof 4 at at least three points that are not on the same straight line and maintain a horizontal position, the number and arrangement of the columns can be changed as appropriate.

[0015] In this embodiment, an example is shown where the substructure consists of multiple columns 3, but the substructure is not limited to this and can have various configurations as long as it can support the superstructure.

[0016] The steel frame roof 4 is formed in a lattice shape by combining a large number of steel materials 4a (in FIG. 1, for the sake of convenience, only some of the steel materials are labeled) that are thinner than the columns 3. More specifically, the steel frame roof 4 has a structure formed in a lattice shape by joining a plurality of steel materials 4a arranged in two tiers at intervals in the vertical direction in a horizontal posture and a plurality of steel materials 4a arranged at intervals in the horizontal direction in a vertical posture.

[0017] Note that the steel frame roof 4 is not limited to a plurality of steel materials 4a, and may be formed in a lattice shape using other members such as a plurality of square steel pipes or circular steel pipes. Also, the overall shape, size, etc. of the steel frame roof 4 can be appropriately changed.

[0018] In this embodiment, the case where the upper structure is the steel frame roof 4 is illustrated, but it is not limited thereto. As long as the upper structure is supported by the lower structure, it may have various configurations such as a lattice roof.

[0019] As shown in FIG. 2, the support structure 10 according to this embodiment has support portions 20 provided at at least three locations between the column 3 as the lower structure and the steel frame roof 4 as the upper structure. In this embodiment, the support portions 20 are provided between all the columns 3 and the steel frame roof 4 that constitute the building 1.

[0020] The support portion 20 has a lower plate portion 21 and an upper plate portion 22.

[0021] The lower plate portion 21 has an upward concave lower spherical surface 21a and is fixed to the column 3 as the lower structure. As shown in FIGS. 2 and 3, in this embodiment, the lower plate portion 21 is formed in a circular block shape centered on the axis O in plan view by cutting a steel material, and the lower spherical surface 21a is provided on its upper surface 21b. The lower spherical surface 21a is a spherical surface that is concave downward with respect to the upper surface 21b, and its center point P1 coincides with the center position of the circular upper surface 21b in plan view, that is, the axis O.

[0022] The column 3 is equipped with a steel plate diaphragm 3a horizontally positioned at its upper end. The lower shoe portion 21 is positioned above the diaphragm 3a and is fixed to the diaphragm 3a by welding.

[0023] The upper shoe portion 22 has a downwardly convex upper spherical surface 22a that contacts the lower spherical surface 21a, and is fixed to the steel frame roof 4, which is the superstructure. In this embodiment, the upper shoe portion 22 is formed by cutting steel material to have a connecting portion 22c with a joining surface 22b at its upper end and a spherical portion 22d.

[0024] The steel frame roof 4 has a joint 4b. The joint 4b is a circular or rectangular plate shape centered on the axis O and is joined to multiple steel members 4a that make up the steel frame roof 4 by welding. However, the shape of the joint 4b is not limited to a circular or rectangular plate shape.

[0025] The connecting portion 22c is the part that connects the steel frame roof 4 and the projection portion 22d. The connecting portion 22c is a cylindrical shape that is smaller in diameter and coaxial with the joint portion 4b, and is joined to the joint portion 4b by welding at the joint surface 22b provided at its upper end. Note that the shape of the connecting portion 22c is not limited to a cylindrical shape.

[0026] The spherical portion 22d is the part that has an upper spherical surface 22a and is connected to the lower end of the connecting portion 22c. The spherical portion 22d is larger in diameter and coaxial with the connecting portion 22c, and its lower surface is the upper spherical surface 22a. The upper spherical surface 22a is a sphere that is convex downwards, and its center point P1 coincides with the center position of the circular spherical portion 22d in a plan view. Note that the shape of the spherical portion 22d is not limited to a disc shape as long as its lower surface is the upper spherical surface 22a.

[0027] The radius of the upper spherical surface 22a centered at point P1 is the same as the radius of the lower spherical surface 21a centered at point P1. That is, both the spherical surface of the lower spherical surface 21a and the spherical surface of the upper spherical surface 22a are spherical surfaces centered at the aforementioned point P1. The area of ​​the upper spherical surface 22a is smaller than the area of ​​the lower spherical surface 21a, and the upper spherical surface 22a is in contact with the lower spherical surface 21a over its entire surface. Furthermore, the upper spherical surface 22a can slide along the lower spherical surface 21a. Therefore, the upper shoe portion 22 can rotate around point P1 relative to the lower shoe portion 21 when viewed from the horizontal direction, as the upper spherical surface 22a slides along the lower spherical surface 21a.

[0028] In this embodiment, the upper spherical surface 22a has a shape that satisfies the following conditions. That is, as shown in Figures 4 and 5, the angle from the lower end P2 of the upper spherical surface 22a centered at the center point P1 to the outer edge 22e is θd, and the weight N of the steel roof 4 which is the superstructure is... L The maximum horizontal force N expected to be input during an earthquake. E Let θ be the angle formed by the resultant force F with respect to the vertical, and let α be the load transmission range at a predetermined angle centered on the center point P assumed by the designer, i.e., the assumed load transmission range, then the upper spherical surface 22a is shaped such that θd > θn = θ + α / 2. The assumed load transmission range α is set such that the bearing pressure generated within this assumed load transmission range α is smaller than the bearing strength of the steel material forming the lower shoe portion 21 and the upper shoe portion 22.

[0029] Furthermore, the shape of the upper spherical surface 22a is not limited to a shape that satisfies the above conditions.

[0030] The lower shoe portion 21 can be configured with a plurality of stopper members 23 fixed to its upper surface 21b. In this embodiment, the lower shoe portion 21 is configured with two stopper members 23 fixed to its upper surface 21b. Each of the two stopper members 23 has an arc shape in which the inner circumferential surface 23a is larger in diameter than the connecting portion 22c and smaller in diameter than the spherical portion 22d, and is fixed to the upper surface 21b of the lower shoe portion 21 with two bolts 24 with their circumferential ends facing each other.

[0031] With two stopper members 23 fixed to the upper surface 21b of the lower shoe portion 21, the connecting portion 22c is inserted into a through hole 25 partitioned by the inner circumferential surfaces of the two stopper members 23. Since the through hole 25 is larger in diameter than the connecting portion 22c and smaller in diameter than the spherical portion 22d, when the upper shoe portion 22 moves upward relative to the lower shoe portion 21, the spherical portion 22d comes into contact with the stopper member 23, restricting the movement. In this way, by configuring the lower shoe portion 21 with multiple stopper members 23 fixed to its upper surface 21b, the upper shoe portion 22 can be prevented from coming off the lower shoe portion 21.

[0032] Furthermore, the number of stopper members 23 fixed to the upper surface 21b of the lower shoe portion 21 is not limited to two, but may be three or more. Also, multiple stopper members 23 may be arranged with spacing in the circumferential direction.

[0033] In the support structure 10 according to this embodiment having the above configuration, the steel roof 4 has a weight N L The vertical load or compressive force is transmitted from the upper spherical surface 22a of the upper shoe portion 22, which is fixed to the steel frame roof 4, to the lower spherical surface 21a of the lower shoe portion 21, which is fixed to the column 3, thereby supporting the column 3.

[0034] In the support structure 10 according to this embodiment, when a horizontal force (horizontal load) is applied to the steel roof 4 due to an earthquake, this horizontal force is transmitted from the upper spherical surface 22a of the upper shoe portion 22 fixed to the steel roof 4 to the lower spherical surface 21a of the lower shoe portion 21 fixed to the column 3. At this time, since the upper spherical surface 22a of the upper shoe portion 22 fixed to the steel roof 4 is slidable relative to the lower spherical surface 21a of the lower shoe portion 21 fixed to the column 3, when a horizontal force is applied to the steel roof 4, the upper shoe portion 22 rotates around the center point P1 when viewed from the horizontal direction relative to the lower shoe portion 21. As a result, in the support structure 10 according to this embodiment, the steel roof 4, which is the upper structure, is supported by being joined to the column 3, which is the lower structure, by pin connections. Therefore, even if a horizontal force is applied to the joint between the steel roof 4 and the columns 3 during an earthquake, the upper shoe portion 22 rotates around the center point P1 when viewed horizontally relative to the lower shoe portion 21, thereby releasing the horizontal force and preventing excessive load from being applied to the steel roof 4. In other words, the seismic resistance or seismic strength of the building 1 can be increased. Furthermore, since excessive horizontal force can be prevented from being applied to the joint between the steel roof 4 and the columns 3, it becomes possible to use thinner steel members 4a that constitute the joint portion between the steel roof 4 and the columns 3, thereby improving the design of the steel roof 4. Thus, the support structure 10 according to this embodiment makes it possible to achieve both seismic resistance and design in the building 1.

[0035] Furthermore, in the support structure 10 according to this embodiment, the lower shoe portion 21 is provided with an upwardly concave lower spherical surface 21a, and the upper shoe portion 22 is provided with a downwardly convex upper spherical surface 22a that is in contact with the lower spherical surface 21a. Compared to the case where the lower shoe portion 21 is provided with an upwardly convex lower spherical surface and the upper shoe portion 22 is provided with a downwardly concave upper spherical surface that is in contact with the lower spherical surface, the weight N of the steel roof 4 is... L The maximum horizontal force N expected to be input during an earthquake. E The eccentric distance e (see Figure 4) between the line of action of the resultant force F and the center of gravity P3 of the joint 4b can be reduced. This makes it easier for the upper shoe 22 to rotate relative to the lower shoe 21 during an earthquake, thereby further improving the seismic resistance of the building 1.

[0036] Furthermore, in the support structure 10 according to this embodiment, the upper spherical surface 22a has a shape that satisfies the above-mentioned condition θd > θ + α / 2, so that the upper shoe portion 22 can rotate more reliably relative to the lower shoe portion 21 when an earthquake occurs, thereby further enhancing the seismic resistance of the building 1.

[0037] The present invention is not limited to the embodiments described above, and it goes without saying that various modifications are possible without departing from the spirit of the invention. [Explanation of Symbols]

[0038] 1 Building 2 Basics 3 pillars (substructure) 3a Diaphragm 4. Steel frame roof (superstructure) 4a steel material 4b joint 10 Support structure 20 Bearing part 21 Lower shoe section 21a Lower spherical surface 21b Top surface 22 Upper shoe section 22a Upper spherical surface 22b Joint surface 22c Connecting part 22d Spherical part 22e Outer edge 23 Stopper component 23a Inner surface 24 volts 25 Through holes O axis P1 center point P2 bottom end P3 Center of gravity θd angle θ angle N L weight N E maximum horizontal force F resultant force α Assumed load transmission range e Eccentricity distance

Claims

1. A support structure in which a lower structure supports an upper structure, Support portions are provided at least three locations that are not on the same straight line between the lower structure and the upper structure. The aforementioned support portion, A lower shoe portion is fixed to the lower structure and has an upward-facing concave lower spherical surface, A support structure characterized by having an upper shoe portion fixed to the upper structure, which has a downwardly convex upper spherical surface in contact with the lower spherical surface.

2. The upper shoe portion has a connecting portion with a joint surface at its upper end that is fixed to the upper structure, and a spherical portion with a larger diameter than the connecting portion that is connected to the lower end of the connecting portion. The support structure according to claim 1, wherein a plurality of stopper members, each having an arc shape with an inner circumferential surface that is larger in diameter than the connecting portion and smaller in diameter than the spherical portion, are fixed to the upper surface of the lower shoe portion.

3. Let θd be the angle from the lower end of the upper spherical surface to the outer edge, centered on the center point of the upper spherical surface. Let θ be the angle with respect to the vertical direction formed by the resultant force of the weight of the superstructure and the maximum horizontal force expected to be input during an earthquake. When the assumed load transmission range centered on the aforementioned center point is denoted as α, The support structure according to claim 1 or 2, wherein the upper spherical surface has a shape that satisfies θd > θ + α / 2.

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