Vibration control frame

Abstract

To provide a vibration control frame or the like leading to effective use of a space in a building.SOLUTION: The vibration control frame 1 has a frame part 2 and a frame part 3. In the vibration control frame 1, at least a part of the frame part 3 is arranged within a range demarcated by the outer edge of the frame part 2 in a plane. The vibration control frame 1 has a brace damper 4 for absorbing horizontal vibration by using a horizontal displacement difference at different heights of the frame parts 2 and 3. The brace damper 4 is inclined to the vertical direction and the horizontal direction, and both end parts are respectively connected to the frame parts 2 and 3 at different heights.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a seismic damping structure and the like. [Background technology]

[0002] A rigid frame structure is a structure made up of columns and beams, and the columns and beams are often made of reinforced concrete (RC) or steel (S) construction. However, the columns and beams can also be made of wood, which is an effective way to reduce CO2 emissions as a measure against global warming, and the exposed wood can also be used to improve the design (for example, Patent Document 1). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Patent No. 3990715 Summary of the Invention [Problem to be solved by the invention]

[0004] In rigid frame structures, measures such as increasing the number of columns or enlarging the cross-section of the members are often taken to ensure the necessary rigidity and strength. However, this poses the problem that the area occupied by the columns and beams in the building increases, reducing the amount of space that can be effectively used within the building.

[0005] The present invention has been made in view of the above problems, and aims to provide a seismic control frame or the like that leads to effective use of space within a building. [Means for solving the problem]

[0006] In order to solve the above-mentioned problems, the present invention provides a seismic control structure having first and second structural parts including columns and beams, in which at least a portion of the second structural part is arranged in a plane within a range defined by the outer edge of the first structural part, and having a damper that absorbs horizontal vibrations by utilizing the horizontal displacement difference that occurs between the different heights of the first and second structural parts.

[0007] This invention utilizes the difference in horizontal displacement that occurs during an earthquake or other events between two structural members at different heights, and uses dampers to absorb vibrations, thereby improving the seismic safety of the entire building. This eliminates the need to increase the number of columns or increase the size of the columns and beams to ensure the necessary rigidity and strength, leading to more effective use of the space within the building.

[0008] The damper is, for example, a brace damper that is inclined with respect to the vertical and horizontal directions, and both ends of the brace damper are connected to the first and second frame portions at different heights, respectively. The damper is, for example, the above-mentioned brace damper, and can absorb vibrations with a simple configuration.

[0009] It is desirable that the first and second frame portions are not rigidly connected, and that the first and second frame portions have different rigidities in the horizontal direction. In this case, differences in the rigidity of the frame parts can also cause differences in horizontal displacement during vibration, making it possible for the damper to absorb vibrations even more efficiently.

[0010] It is desirable that the heights at which beams are provided in the first and second frame portions are different. This makes it easy to avoid interference between the first and second structural components, increasing the design freedom of the building.

[0011] It is desirable that at least one of the first and second frame parts is provided with a TMD. This can further improve the vibration damping effect. [Effects of the Invention]

[0012] The present invention can provide a seismic control frame or the like that leads to effective use of space within a building. [Brief explanation of the drawings]

[0013] [Figure 1] 1 is a diagram showing an outline of a seismic control frame 1. FIG. [Figure 2] 1 is a diagram showing an outline of a seismic control frame 1. FIG. [Figure 3] FIG. 10 is a diagram showing a brace damper 4. [Figure 4] 10 is a diagram illustrating the difference in horizontal displacement between frame parts 2 and 3. FIG. [Figure 5] FIG. 2 is a diagram showing the layout pattern of frame parts 2 and 3 in a plane. [Figure 6] FIG. 10 is a diagram showing an example in which the frame part 3 is arranged higher than the frame part 2. [Figure 7] FIG. 4 shows a viscous wall damper 4a. [Figure 8] Diagram showing TMD5. DETAILED DESCRIPTION OF THE INVENTION

[0014] Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the drawings.

[0015] 1 and 2 are diagrams showing an outline of a seismic isolation frame 1 according to an embodiment of the present invention. Fig. 1 is a schematic elevation view of the seismic isolation frame 1, and Fig. 2 is a schematic horizontal cross-section view of the seismic isolation frame 1. Fig. 2 shows a cross-section taken along line AA in Fig. 1.

[0016] As shown in Figure 1, the vibration-damping frame 1 is a frame for the ground floor of a building, and has two independent frame sections 2 and 3 that are not rigidly connected to each other. The vibration-damping frame 1 is used in, for example, a high-rise building, but is not limited to this.

[0017] The frame section 2 (first frame section) is a frame formed using wooden materials. The frame section 2 has a rigid frame structure consisting of columns 21 and beams 22. The rigid frame structure is a frame having a basic portal shape in which adjacent columns 21 are connected by beams 22. The beams 22 are provided at a height corresponding to each standard floor of the building, and are arranged in two intersecting directions on the plane (x direction and y direction in Figure 2). The columns 21 and beams 22 are formed using wooden materials. The wooden frame section 2 forms the outer edge of the building and shapes the exterior appearance of the building, thereby giving the building excellent design.

[0018] The columns 21 and beams 22 may be made entirely of wood, or may be a composite structure of wood with concrete or steel frames, with the surface finished with wood. There are no particular restrictions on the wood material, but laminated lumber, structural plywood, CLT (Cross Laminated Timber), LVL (Laminated Veneer Lumber), etc. can be used. There are also no particular restrictions on the method of joining the columns 21 and beams 22 in the frame section 2, and they can be rigid joints, pin joints, or a combination of both.

[0019] Frame section 3 (second frame section) is a frame located in the inner core part of the building, and like frame section 2, has a rigid frame structure with columns 31 and beams 32. However, the height at which beams 22 and 32 are installed differs between frame sections 2 and 3. Frame section 3 is shown in gray in Figures 1 and 2. This is also the case in the other figures described below (except Figure 4).

[0020] The columns 31 are erected in a section surrounded by the columns 21 and beams 22 of the frame section 2 in plan view. The beams 32 are passed through the structural plane surrounded by the columns 21 and beams 22 of the frame section 2 in elevation view. The beams 32 are provided at a height corresponding to the intermediate floors of the building, and are arranged in two intersecting directions in plan view (the x and y directions in Figure 2). The columns 31 and beams 32 are formed using wooden materials, as described above. The method of joining the columns 31 and beams 32 in the frame section 3 is not particularly limited, and may be a rigid joint, a pin joint, or a combination of both.

[0021] As shown in Figure 3, the frame members 2 and 3 are connected by a brace damper 4 that is inclined relative to the horizontal and vertical directions. A known oil damper, for example, can be used as the brace damper 4. Both ends of the brace damper 4 are connected to the frame members 2 and 3 at different heights. In particular, in this embodiment, both ends of the brace damper 4 are connected to the column-beam joints of the frame members 2 and 3.

[0022] The brace damper 4 can absorb vibrations of the building during an earthquake or the like by utilizing the difference in horizontal displacement that occurs between the frame parts 2 and 3 at different heights.

[0023] Figure 4 is a diagram that briefly explains this horizontal displacement difference, with the left side showing the horizontal distance D between both ends of the brace damper 4 before vibration (the horizontal distance between the frame members 2 and 3), and the right side showing the horizontal distance D' between both ends of the brace damper 4 during vibration. Also, for the sake of explanation, Figure 4 differs from Figure 2 in that the frame members 2 and 3 are shown in different positions.

[0024] The difference in horizontal displacement of frame members 2 and 3 that occurs between the heights of both ends of brace damper 4 can be expressed as ΔH / tanθ using the difference in height ΔH between both ends of brace damper 4 and the deformation angle θ of frame members 2 and 3, and the horizontal distance D' between both ends of brace damper 4 during vibration is D-ΔH / tanθ. The value of horizontal distance D' fluctuates as the building vibrates, causing the overall length of brace damper 4 to expand and contract, and at this time brace damper 4 absorbs the vibration.

[0025] Furthermore, in this embodiment, the horizontal rigidity of the frame members 2 and 3 is different in both of the two directions (see the x and y directions in FIG. 2 ). The rigidity of either of the frame members 2 and 3 may be higher. That is, the rigidity of the frame member 2 may be higher than that of the frame member 3, or the rigidity of the frame member 3 may be higher than that of the frame member 2. Such a difference in rigidity also causes a difference in horizontal displacement when the frame members 2 and 3 vibrate, allowing the brace damper 4 to absorb the vibration more efficiently. Note that the level of rigidity is determined by comparing the rigidity of the entire frame member 2 with the rigidity of the entire frame member 3 when it is assumed that the frame members 2 and 3 are not connected by the brace damper 4.

[0026] As explained above, the vibration-damping frame 1 of this embodiment utilizes the difference in horizontal displacement that occurs during an earthquake or other events between the two frame sections 2 and 3 at different heights, and absorbs vibrations using the brace dampers 4, thereby improving the seismic safety of the entire building. This eliminates the need to add columns or increase the size of the column and beam components to ensure the necessary rigidity and strength, leading to more effective use of the space within the building. Furthermore, connecting the frame sections 2 and 3 with the brace dampers 4 improves the stability of the frame sections 2 and 3, and ultimately the entire building.

[0027] In particular, in this embodiment, wooden materials are used for the frame members 2 and 3, making it possible to realize a building that is excellent in terms of the environment and design, while also compensating for the weak points of rigid frame structures that use wooden materials, such as low rigidity and low strength. In addition, the beams 22 and 32 of the frame members 2 and 3 are provided at different heights, making it easy to avoid interference between the frame members 2 and 3, which increases the degree of freedom in the design of the building and makes construction of the frame members 2 and 3 easier.

[0028] In addition, the brace damper 4 of this embodiment is disposed at an angle relative to the vertical and horizontal directions between the frame members 2 and 3, allowing vibrations to be absorbed with a damper of simple configuration. In this embodiment, the difference in horizontal rigidity between the frame members 2 and 3 can also cause a difference in horizontal displacement during vibration, allowing the brace damper 4 to absorb vibrations even more efficiently.

[0029] However, the present invention is not limited to the above embodiment. For example, in this embodiment, an oil damper is used as the brace damper 4, but instead, a steel damper such as Unbonded Brace (registered trademark) may be used.

[0030] Furthermore, in this embodiment, the frame members 2 and 3 are made of wood, but the structural type of the frame members 2 and 3 is not particularly limited, and the columns 21 and 31 and beams 22 and 32 can be made of reinforced concrete or steel members that do not use wood. Also, these structural types may be combined, with the columns 21 and 31 being reinforced concrete and the beams 22 and 32 being steel. Note that steel construction also includes the columns 21 and 31 being CFT columns (concrete-filled steel pipe columns).

[0031] Furthermore, the planar configuration of the frame unit 2 is not limited to a rectangular grid in which the beams 22 in two directions are arranged perpendicular to each other in a plane, as shown in Figure 2. For example, the beams 22 may be curved in a planar view, and the angle formed by the beams 22 in the two directions in a plane may be other than 90°. This also applies to the frame unit 3.

[0032] Furthermore, the layout pattern of the frame members 2, 3 in a plane is not limited to the example in Fig. 2. For example, as shown in Fig. 5(a), a portion of the frame member 3 may extend outside the frame member 2, or as shown in Fig. 5(b), the frame member 2 may be provided only on the periphery of the building, with the frame member 3 provided inside it. In either case, it is sufficient that at least a portion of the frame member 3 is arranged within the range R defined by the outer edge of the frame member 2 in a plane.

[0033] Furthermore, the elevation configuration of the frame sections 2 and 3 is not particularly limited; for example, the beam 32 of the frame section 3 may be omitted on some intermediate floors. In addition, in the case where the frame sections 2 and 3 are provided at different positions as shown in Figure 5(b), the beams 22 and 32 of the frame sections 2 and 3 may be provided at the same level. Furthermore, although the frame section 3 is lower than the frame section 2 in the example of Figure 1, the frame section 3 may also be higher than the frame section 2 as shown in Figure 6.

[0034] The seismic isolation structure 1 of this embodiment can be applied to buildings with various uses, functions, plan shapes, and designs by combining various layout patterns in the plan and elevation of the frame members 2 and 3. There are no particular restrictions on the plan size or height of the building.

[0035] In addition, in this embodiment, both ends of the brace damper 4 are connected to the column-beam joints of the frame units 2 and 3, but the connection points of both ends of the brace damper 4 to the frame units 2 and 3 are not particularly limited as long as they are at different heights. For example, they can be connected to the columns 21 and 31 of the frame units 2 and 3, or to the beams 22 and 32 of the frame units 2 and 3. Furthermore, they can be connected to the column 21 of the frame unit 2 and the beam 32 of the frame unit 3, or to the beam 22 of the frame unit 2 and the column 31 of the frame unit 3.

[0036] Furthermore, there are no particular restrictions on the layout of the brace dampers 4 in terms of their plan and elevation. For example, in the example of Figure 1, brace dampers 4 are provided on all floors of the frame section 3, but brace dampers 4 do not necessarily need to be provided on all floors of the frame section 3, and they may be provided only on any floor. For example, they may be distributed every few floors, or may be concentrated on special floors such as machine room floors, outdoor equipment floors, and green terrace floors, or on floors with switchable building uses.

[0037] 2 are arranged line-symmetrically with respect to the center lines c1 and c2 in the x and y directions of the frame section 3, or point-symmetrically with respect to the center o of the frame section 3, which is preferable from the standpoint of balance, but there are no particular restrictions on the arrangement of the brace dampers 4 in a plane, and some deviation does not pose a problem. Another method that can be used is to disrupt the balance by using an oil damper on one side of the center line c1 or c2 and a steel damper on the other, and then actively absorb dynamic vibrations with the oil damper.

[0038] 7, it is also possible to connect the columns 21 and 31 of the frame parts 2 and 3 with a seismic isolation wall such as a viscous wall damper 4a instead of the brace damper 4. In this case, as in the example of FIG. 4, it is possible to absorb vibrations by utilizing the difference in horizontal displacement that occurs between the frame parts 2 and 3 at different heights.

[0039] Furthermore, in the frame section 3, a shear wall may be placed within the structural plane surrounded by the columns 31 and beams 32. This allows the seismic control effect of the damper to be adjusted. For example, in a high-rise building, if a shear wall is placed only in the core section, such as an elevator shaft, the rigidity of that section will be significantly higher than the rigidity of the rest of the rigid frame, which may result in excessive load concentration and make the design difficult. However, in this embodiment, vibration absorption is performed using the brace damper 4, so there is no need to make the core section (frame section 3) excessively rigid, and the above-mentioned problem does not occur. The structural type of the shear wall is not particularly important.

[0040] Furthermore, as shown in Figure 8, TMDs (Tuned Mass Dampers) 5 may be placed on the frame members 2 and 3 to further absorb vibrations in the frame members 2 and 3. This can further improve the seismic control effect and further reduce the rigidity and strength required of the building. The TMDs 5 can also be placed on only one of the frame members 2 and 3. Furthermore, although the TMDs 5 are placed at the tops of the frame members 2 and 3 in the example of Figure 8, the TMDs 5 can also be placed midway along the height of the frame members 2 and 3.

[0041] In this embodiment, the frame parts 2 and 3 are two independent frames and are not rigidly connected to each other, but the frame parts 2 and 3 may also be rigidly connected to each other by a floor or the like. Even in this case, vibration can be absorbed by a damper by utilizing the horizontal displacement difference (see FIG. 4) that occurs between the frame parts 2 and 3 at different heights. However, if vibration absorption is performed by utilizing the horizontal displacement difference due to the difference in rigidity between the frame parts 2 and 3, the frame parts 2 and 3 are not rigidly connected to each other. Alternatively, it is also possible to add a seismic isolation device to the foundations of the frame parts 2 and 3.

[0042] While the preferred embodiments of the present invention have been described above with reference to the accompanying drawings, the present invention is not limited to these examples. It is clear that those skilled in the art can conceive of various modifications or alterations within the scope of the technical ideas disclosed herein, and it is understood that these modifications also fall within the technical scope of the present invention. [Explanation of symbols]

[0043] 1: Vibration control frame 2, 3: Frame section 4: Brace damper 4a: Viscous wall damper 5:TMD 21, 31: Pillars 22, 32: Beam

Claims

1. The structure has first and second frame parts including columns and beams, In a plan view, at least a portion of the second frame portion is disposed within a range defined by an outer edge of the first frame portion; A seismic control frame comprising a damper that absorbs horizontal vibrations by utilizing the difference in horizontal displacement that occurs between first and second frame parts at different heights.

2. the damper is a brace damper inclined with respect to the vertical direction and the horizontal direction, 2. The seismic vibration control structure according to claim 1, wherein both ends of the brace damper are connected to the first and second frame portions at different heights.

3. The first and second frame parts are not rigidly connected, 2. The seismic damping structure according to claim 1, wherein the first and second frame portions have different rigidities in the horizontal direction.

4. 2. The seismic damping structure according to claim 1, wherein the heights at which beams are provided in the first and second frame portions are different.

5. 2. The seismic control frame according to claim 1, wherein a TMD is provided in at least one of the first and second frame portions.

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