Vibration-damping structure

Abstract

To provide a damping structure that can improve damping performance of buildings with diagonal beams.SOLUTION: The damping structure has: a column-and-beam frame 2 having a plurality of layers and comprising horizontal beams 21 and columns 22; a low-stiffness diagonal beam 3 provided on the first floor (between a part of layers), having an axial direction diagonal to a horizontal direction, having a lower end 31 connected to the column-and-beam frame 2 in a lower layer between the layers, and having an upper end 32 connected to the column-and-beam frame 2 in an upper layer between the layers; and a damping device 5 provided between the layers in which the low-stiffness diagonal beam 3 is provided. The low-stiffness diagonal beam 3 is connected to the column-beam frame 2 through either a sliding bearing 4 or a rolling bearing at one of the lower end 31 and the upper end 32 so as to be relatively movable, and is connected to the column-beam frame 2 through either a rigid joint or pin joint at the other end.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a vibration damping structure. [Background technology]

[0002] Buildings with stepped floors with stepped spectator seating are known, such as stadiums, halls, and arenas where various sports and events are held (see, for example, Patent Document 1). In such buildings, diagonal beams (raker beams) are installed with a predetermined span, and the stepped floors are installed along the diagonal beams. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Patent No. 6833332 Summary of the Invention [Problem to be solved by the invention]

[0004] In buildings with diagonal beams, the diagonal beams function as earthquake-resistant braces, which can cause the rigidity of the frame to become excessive and the rigidity of the entire building to become unbalanced. This can increase the response shear during an earthquake and the maximum response story drift angle of floors without diagonal beams.

[0005] Therefore, an object of the present invention is to provide a vibration control structure that can improve the vibration control performance of a building equipped with diagonal beams. [Means for solving the problem]

[0006] In order to achieve the above-mentioned object, the present invention comprises a column-beam frame having a plurality of stories and equipped with horizontal beams and columns; low-rigidity diagonal beams provided between some of the stories, with their axial direction oblique to the horizontal direction, and whose lower ends are joined to the column-beam frame in the story below the stories and whose upper ends are joined to the column-beam frame in the story above the stories; and a vibration control device provided between the stories on which the low-rigidity diagonal beams are provided, wherein one of the lower and upper ends of the low-rigidity diagonal beams is joined to the column-beam frame via either a sliding bearing or a rolling bearing so as to be movable relative to the column-beam frame in the horizontal direction, and the other end is joined to the column-beam frame by either a rigid joint or a pin joint.

[0007] In this invention, the low-rigidity diagonal beams can be configured so that one end is deformable relative to the column-beam frame in the horizontal direction, thereby not bearing seismic forces. Therefore, even when a building is equipped with many diagonal beams to provide terraced floors for spectators, by using at least some of the diagonal beams as low-rigidity diagonal beams, it is possible to prevent the building from becoming excessively rigid due to the installation of many diagonal beams. Deformation is concentrated between stories where low-rigidity diagonal beams are installed, but by installing vibration control devices between these stories, the seismic energy between stories can be efficiently absorbed, reducing the response during an earthquake. As a result, the vibration control performance of buildings equipped with diagonal beams can be improved.

[0008] The vibration control structure of the present invention may have a damper that reduces the relative displacement between the one end of the low-rigidity diagonal beam and the column-beam structure when the inter-layer deformation angle between the layers in which the low-rigidity diagonal beam is provided exceeds a predetermined value.

[0009] With this configuration, if the inter-story deformation angle between the layers where the low-rigidity diagonal beams are installed exceeds a predetermined value due to earthquake motion that exceeds expectations, the damper will limit the horizontal relative displacement between the one end of the low-rigidity diagonal beam and the column-beam structure, so that the damper and the low-rigidity diagonal beam can bear the horizontal force of the earthquake motion and absorb the earthquake energy.

[0010] In the vibration control structure of the present invention, the damper may be configured to reduce only the relative displacement in the axial direction of the low-rigidity diagonal beam and in the direction away from the one end of the low-rigidity diagonal beam and the column-beam frame when the inter-story deformation angle exceeds a predetermined value.

[0011] With this configuration, when the inter-story deformation angle exceeds a predetermined value, the relative displacement in the axial direction of the low-rigidity diagonal beam and in the direction away from one end of the low-rigidity diagonal beam and the column-beam frame is limited, so that the damper and the low-rigidity diagonal beam can bear the tensile force acting on the low-rigidity diagonal beam. When the damper reduces the relative displacement of one end of the low-rigidity diagonal beam in the direction in which it approaches the column-beam frame and limits the relative displacement, the damper and the low-rigidity diagonal beam bear the compressive force acting on the low-rigidity diagonal beam. In such a case, a force acts on the low-rigidity diagonal beam in the direction in which it lifts up from the column-beam frame. In this invention, as described above, when the story deformation angle exceeds a predetermined value, the low-rigidity diagonal beam bears only the tensile force, preventing the low-rigidity diagonal beam from lifting up from the column-beam frame. This ensures the safety of facilities and equipment above the low-rigidity diagonal beam, such as spectator seats installed on the step floor above the low-rigidity diagonal beam.

[0012] In the vibration control structure of the present invention, the damper may be a steel damper extending in the same direction as the axial direction of the low-rigidity diagonal beam and provided between the one end of the low-rigidity diagonal beam and the column-beam frame, and the steel damper and the column-beam frame may be pin-joined, and the steel damper and the one end of the low-rigidity diagonal beam may be joined so as to allow relative displacement in the axial direction of the low-rigidity diagonal beam when the inter-story deformation angle is equal to or less than a predetermined value, to allow relative displacement in the axial direction of the low-rigidity diagonal beam in a direction moving closer to the one end of the low-rigidity diagonal beam and to restrict relative displacement in the axial direction of the low-rigidity diagonal beam in a direction moving away from the one end of the low-rigidity diagonal beam when the inter-story deformation angle exceeds the predetermined value.

[0013] With this configuration, it is possible to easily realize a mechanism in which the damper and the low-rigidity diagonal beams bear the tensile force acting on the low-rigidity diagonal beams when the inter-story deformation angle exceeds a predetermined value.

[0014] In the vibration-damping structure according to the present invention, the predetermined value of the inter-story deformation angle may be 1 / 100 rad.

[0015] With this configuration, the damper does not act in earthquake motions of level 2 or below, but acts in earthquake motions above level 2, allowing the low-rigidity diagonal beams and damper to absorb earthquake energy.

[0016] In the vibration control structure according to the present invention, a stepped floor for providing spectator seats may be provided on the low-rigidity diagonal beams.

[0017] This configuration can improve the vibration control performance of buildings that have stepped floors for spectator seats, etc. [Effects of the Invention]

[0018] According to the present invention, the vibration control performance of a building equipped with diagonal beams can be improved. [Brief explanation of the drawings]

[0019] [Figure 1] 1 is a vertical cross-sectional view showing a vibration damping structure according to a first embodiment. [Figure 2] FIG. 6 is a vertical cross-sectional view showing a vibration damping structure according to a second embodiment. [Figure 3] FIG. 10 is a vertical cross-sectional view showing a vibration damping structure according to a modified example of the embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0020] (First embodiment) A vibration damping structure according to a first embodiment of the present invention will now be described with reference to FIG. The vibration control structure 1 according to this embodiment shown in Fig. 1 is employed in a building 11 provided with stepped spectator seating 12, such as a stadium, hall, or arena. The building 11 has multiple floors (layers), and spectator seating is provided on multiple floors. In this embodiment, the building has four floors. In Fig. 1, the first to fourth floors are designated by reference numerals 111-114 in order. Reference numeral 14 shown in Fig. 1 is a roof. The vibration control structure 1 has a column-beam frame 2 equipped with horizontal beams 21 and columns 22, a low-rigidity diagonal beam 3 provided on the first floor, a sliding bearing 4 provided between the low-rigidity diagonal beam 3 and the column-beam frame 2, and a vibration control device 5 provided on the first floor.

[0021] The column-beam frame 2 is a frame constructed by horizontal beams 21 and columns 22 across the entire first to fourth floors of the building 11. The column-beam frame 2 is supported by the ground.

[0022] The axis of the low-rigidity diagonal beams 3 extends in a diagonal direction oblique to the horizontal. The diagonal direction in which the axis of the low-rigidity diagonal beams 3 extends is from the center of the building 11 (left side in Fig. 1) to the outer periphery (right side in Fig. 1), from the bottom to the top. The direction in which the axis of the low-rigidity diagonal beams 3 extends is referred to as the axial direction.

[0023] The lower end 31 (one end) of the low-rigidity diagonal beam 3 is connected to the horizontal beam 211 on the first floor via a sliding bearing 4. The lower end 31 of the low-rigidity diagonal beam 3 and the horizontal beam 211 on the first floor are capable of relative displacement in the horizontal direction. The upper end 32 (the other end) of the low-rigidity diagonal beam 3 is connected to the joint 23 between the horizontal beam 212 on the second floor and the column 22 by either a rigid joint or a pin joint. The relative displacement in the horizontal and vertical directions between the upper end 32 of the low-rigidity diagonal beam 3 and the joint 23 between the horizontal beam 212 on the second floor and the column 22 is restrained. The horizontal beam 211 on the first floor refers to the horizontal beam 21 that supports the floor of the first floor, and the horizontal beam 212 on the second floor refers to the horizontal beam 21 that supports the floor of the second floor. The vibration control device 5 is installed in the form of a wall between the horizontal beam 216 on the first floor and the horizontal beam 212 on the second floor using an oil damper or the like. In FIG. 1, the horizontal beam 216 on the first floor, which is located below the vibration control device 5 and to which the vibration control device 5 is connected, is installed at a position slightly lower than the horizontal beam 211 on the first floor to which the lower end portion 31 of the low-rigidity diagonal beam 3 is joined via the sliding bearing 4. Note that the height relationship between the horizontal beam 216 on the first floor to which the vibration control device 5 is connected and the other horizontal beams 211 on the first floor may be other than that described above.

[0024] A stepped floor 13 is provided on top of the low-rigidity diagonal beams 3, and stepped spectator seats 12 are provided on top of that. In this embodiment, spectator seats 12 are also provided on the stepped floor 13 above the diagonal beams 6 on the fourth floor. The diagonal beams 6 on the fourth floor also extend obliquely from the center of the building 11 to the periphery, from bottom to top. The diagonal beams 6 on the fourth floor are rigidly connected to the column and beam frame 2 at both their upper and lower ends, and their relative displacement in the horizontal and vertical directions relative to the column and beam frame 2 is restrained.

[0025] Next, the operation and effect of the vibration damping structure according to the first embodiment will be described. In the vibration-damping structure according to this embodiment, the low-rigidity diagonal beams 3 have lower ends 31 that are horizontally deformable relative to the column-beam frame, thereby preventing seismic forces from being borne. Therefore, even if a building 11 has many diagonal beams, using at least some of the diagonal beams as low-rigidity diagonal beams 3 can prevent the building 11 from becoming excessively rigid due to the large number of diagonal beams. Deformation due to earthquake motion is concentrated between the stories where the low-rigidity diagonal beams 3 are installed. However, by installing vibration-damping devices 5 between these stories, the vibration-damping devices 5 can efficiently absorb seismic energy and reduce earthquake response. As a result, the vibration-damping performance of the building 11 equipped with diagonal beams can be improved. This embodiment improves the vibration-damping performance of the building 11, which has step floors 13 for accommodating spectator seats 12, ensuring the safety of the spectator seats 12.

[0026] (Second embodiment) Next, a second embodiment will be described. The same or similar members and parts as those in the first embodiment will be designated by the same reference numerals, and the description will be omitted. Only the configurations different from the first embodiment will be described. As shown in FIG. 2, in the vibration-control structure 1B according to the second embodiment, a damper 7 is provided between the lower side of the low-rigidity diagonal beam 3 and the horizontal beam 211 on the first floor. When the inter-story deformation angle between the stories (first floor portion) where the low-rigidity diagonal beam 3 is provided exceeds a predetermined value, the damper 7 reduces the relative displacement between the lower end portion 31 of the low-rigidity diagonal beam 3 and the horizontal beam 211 on the first floor. In this embodiment, the predetermined value of the inter-story deformation angle is set to 1 / 100 rad. Furthermore, the damper 7 in this embodiment is configured to reduce only the relative displacement in the axial direction of the low-rigidity diagonal beam 3 and in the direction in which the lower end portion 31 of the low-rigidity diagonal beam 3 moves away from the horizontal beam 211 on the first floor when the inter-story deformation angle exceeds the predetermined value.

[0027] The damper 7 is a steel damper. The damper 7 has a tension rod 71 and a gap device 72. The gap device 72 is a device that applies a force to the tension rod 71 when the inter-story deformation angle exceeds a predetermined value.

[0028] One axial end 711 of the tension rod 71 is pin-connected to the horizontal beam 211 on the first floor near the lower end 31 of the low-rigidity diagonal beam 3. The other axial end 712 of the tension rod 71 is connected to the axial middle part of the low-rigidity diagonal beam 3 via a gap device 72. The axial direction of the tension rod 71 and the axial direction of the low-rigidity diagonal beam 3 are parallel.

[0029] The gap device 72 has a cylindrical portion 721 , a fixing portion 722 , and a diameter expanding member 723 . The cylindrical portion 721 is disposed coaxially with the tension rod 71, and the other end 712 of the tension rod 71 is inserted through the cylindrical portion 721. The tension rod 71 inserted through the cylindrical portion 721 and the cylindrical portion 721 are capable of relative displacement in the axial direction. The cylindrical portion 721 is fixed to the axially intermediate portion of the low-rigidity diagonal beam 3. The cylindrical portion 721 is fixed in parallel to the low-rigidity diagonal beam 3. The diameter expanding member 723 is attached near the other end 712 of the tension rod 71. Its diameter is larger than the inner diameter of the cylindrical portion 721 and it cannot pass through the cylindrical portion 721. The diameter expanding member 723 is located on the other axial side of the tension rod 71 relative to the cylindrical portion 721 through which the tension rod 71 is inserted. When the tension rod 71 moves to one axial side relative to the cylindrical portion 721 and the diameter expanding member 723 comes into contact with the end face of the cylindrical portion 721 on the other axial side, it becomes impossible for the tension rod 71 to move further to one axial side relative to the cylindrical portion 721.

[0030] In the initial state when the damper 7 is installed, the other axial side of the tension rod 71 protrudes further in the axial direction than the cylindrical portion 721, and a gap is disposed between the cylindrical portion 721 and the diameter expansion member 723. The gap between the cylindrical portion 721 and the diameter expansion member 723 is set so that, due to seismic motion, the low-rigidity diagonal beam 3 and the horizontal beam 211 on the first floor are displaced relative to each other so that the lower end portion 31 of the low-rigidity diagonal beam 3 moves toward the outside of the building 11 (to the right in FIG. 2 ) relative to the horizontal beam 211 on the first floor, and the story deformation angle of the first floor portion of the building 11 reaches a predetermined value, causing the cylindrical portion 721 and the diameter expansion member 723 to come into contact.

[0031] As a result, when the story deformation angle of the first floor of the building 11 exceeds a predetermined value, the relative displacement in the above direction between the low-rigidity diagonal beam 3 and the first-floor horizontal beam 211 is constrained. This direction refers to the direction in which the lower end 31 of the low-rigidity diagonal beam 3 faces the outside of the building 11 relative to the first-floor horizontal beam 211. Once the relative displacement in the above direction between the low-rigidity diagonal beam 3 and the first-floor horizontal beam 211 is constrained, any further relative displacement between the low-rigidity diagonal beam 3 and the first-floor horizontal beam 211 in the above direction will cause a tensile force to act on the tension rod 71, which in turn will also act on the low-rigidity diagonal beam 3. In other words, when the story deformation angle exceeds a predetermined value, the damper 7 and the low-rigidity diagonal beam 3 can withstand the tensile force acting on the low-rigidity diagonal beam 3 due to seismic motion. The tension rod 71 has its lower end pin-jointed to the horizontal beam 211 on the first floor and its upper end inserted into a tubular section 721 parallel to the low-rigidity diagonal beam 3, so that it remains parallel to the low-rigidity diagonal beam 3 even if there is relative displacement between the low-rigidity diagonal beam 3 and the horizontal beam 211 on the first floor.

[0032] One end 711 of the tension rod 71 and the tubular portion 721 are sufficiently separated so that even if seismic motion causes a relative displacement between the low-rigidity diagonal beam 3 and the horizontal beam 211 on the first floor, such that the lower end 31 of the low-rigidity diagonal beam 3 moves in a direction toward the inside of the building 11 (toward the left in Figure 2) relative to the horizontal beam 211 on the first floor, the tubular portion 721 does not reach one end 711 of the tension rod 71. As a result, even if seismic motion causes a relative displacement between the low-rigidity diagonal beam 3 and the horizontal beam 211 on the first floor, such that the lower end 31 of the low-rigidity diagonal beam 3 moves in a direction toward the inside of the building 11 relative to the horizontal beam 211 on the first floor, the seismic motion does not act on the damper 7, and the seismic motion does not act on the low-rigidity diagonal beam 3 either. If the lower end 31 of the low-rigidity diagonal beam 3 is fixed to the horizontal beam 211 on the first floor, relative displacement in which the lower end 31 of the low-rigidity diagonal beam 3 moves toward the inside of the building 11 relative to the horizontal beam 211 on the first floor will result in a compressive force acting on the low-rigidity diagonal beam 3. In this embodiment, the lower end 31 of the low-rigidity diagonal beam 3 is not fixed to the horizontal beam 211 on the first floor, and even if seismic motion causes a relative displacement between the low-rigidity diagonal beam 3 and the horizontal beam 211 on the first floor in which the lower end 31 of the low-rigidity diagonal beam 3 moves toward the inside of the building 11 relative to the horizontal beam 211 on the first floor, the seismic motion does not act on the damper 7, and therefore no compressive force acts on the low-rigidity diagonal beam 3.

[0033] In the vibration-control structure 1B according to the second embodiment described above, if the inter-story deformation angle between stories where low-rigidity diagonal beams 3 are installed exceeds a predetermined value due to earthquake motion that exceeds expectations, the damper 7 limits the horizontal relative displacement between the low-rigidity diagonal beams 3 and the horizontal beams 211 on the first floor, so that the damper 7 and the low-rigidity diagonal beams 3 can bear the horizontal force of the earthquake motion and absorb the earthquake energy.

[0034] In addition, in the vibration control structure 1B according to the second embodiment, when the inter-story deformation angle exceeds a predetermined value, the damper 7 and the low-rigidity diagonal beam 3 are configured to bear only the tensile force acting on the low-rigidity diagonal beam 3 due to seismic motion, and not to bear the compressive force acting on the low-rigidity diagonal beam 3 due to seismic motion. If the dampers 7 and low-rigidity diagonal beams 3 are set to bear the compressive force acting on the low-rigidity diagonal beams 3, a force acts on the low-rigidity diagonal beams 3 in a direction that causes them to lift up from the column-beam frame 2. In the second embodiment, as described above, when the story deformation angle exceeds a predetermined value, the low-rigidity diagonal beams 3 bear only the tensile force, preventing the low-rigidity diagonal beams 3 from lifting up from the column-beam frame 2. This ensures the safety of the spectator seats 12 provided on the step floor 13 above the low-rigidity diagonal beams 3.

[0035] In the vibration-damping structure 1B according to the second embodiment, the predetermined value of the inter-story deformation angle is set to 1 / 100 rad. As a result, damper 7 does not act in earthquake motions of level 2 or less, but acts in earthquake motions above level 2, allowing seismic energy to be absorbed by low-rigidity diagonal beams 3 and damper 7. In addition, the response deformation can be reduced to 1 / 80 rad or less, which is repairable.

[0036] Although the embodiment of the vibration damping structure according to the present invention has been described above, the present invention is not limited to the above embodiment and can be modified as appropriate within the scope of the invention. For example, in the above embodiment, a sliding bearing 4 is provided between the lower end 31 of the low-rigidity diagonal beam 3 and the column-beam frame 2, but a rolling bearing may be provided instead of the sliding bearing 4, and the lower end 31 of the low-rigidity diagonal beam 3 may be joined to the column-beam frame 2 via the rolling bearing so that it can move horizontally relative to the column-beam frame 2. In the above embodiment, the upper end 32 of the low-rigidity diagonal beam 3 is joined to the joint 23 between the horizontal beam 212 on the second floor and the column 22 by either a rigid joint or a pin joint, but the part of the column-beam structure 2 to which the upper end 32 of the low-rigidity diagonal beam 3 is joined may be other than the joint 23 between the horizontal beam 21 and the column 22. In the above embodiment, the lower end portions 31 of the low-rigidity diagonal beams 3 are joined to the column-beam frame 2 via sliding bearings 4 so as to be relatively movable in the horizontal direction, and the upper end portions 32 of the low-rigidity diagonal beams 3 are joined to the column-beam frame 2 by either a rigid joint or a pin joint. Alternatively, the upper end portions 32 of the low-rigidity diagonal beams 3 may be joined to the column-beam frame 2 via either sliding bearings 4 or rolling bearings so as to be relatively movable in the horizontal direction, and the lower end portions 31 of the low-rigidity diagonal beams 3 may be joined to the column-beam frame 2 by either a rigid joint or a pin joint.

[0037] In the above embodiment, the vibration damping device 5 provided on the beam-column frame 2 is provided in a wall shape, but it may also be provided in a brace shape, like a vibration damping device 5C shown in FIG. In the above embodiment, the low-rigidity diagonal beams 3 are provided on the first floor, but they may also be provided on floors other than the first floor, or on a plurality of floors excluding all floors. In order to concentrate deformation due to earthquake motion more between the stories where the low-rigidity diagonal beams 3 are provided, braces or the like may be provided between the stories where the low-rigidity diagonal beams 3 are provided to increase the rigidity between the stories.

[0038] In the second embodiment described above, when the inter-story deformation angle exceeds a predetermined value, the damper 7 and the low-rigidity diagonal beam 3 are configured to bear only the tensile force acting on the low-rigidity diagonal beam 3 due to seismic motion, and not to bear the compressive force acting on the low-rigidity diagonal beam 3 due to seismic motion, but they may also be configured to bear the compressive force. In the second embodiment, the predetermined value of the inter-story deformation angle is set to 1 / 100 rad, but it may be set to any value.

[0039] The Sustainable Development Goals (SDGs) are 17 international goals adopted at the United Nations Summit in September 2015. The vibration control structure of this embodiment can contribute to achieving one of the 17 SDGs, for example, goal 11, "Make cities and towns inclusive and sustainable." [Explanation of symbols]

[0040] 1,1B Vibration control structure 2-column beam frame 3 Low rigidity diagonal beam 4. Sliding bearings 5,5C vibration control device 6 diagonal beam 12 seats 13 tiers 21,211,212,216 horizontal beam 22 pillars 31 Lower end (one end) 32 Upper end (other end)

Claims

1. a beam-column frame having a plurality of stories and including horizontal beams and columns; a low-rigidity diagonal beam provided between some of the layers, with an axial direction oblique to the horizontal direction, with a lower end joined to the column-beam frame in a lower layer between the layers and an upper end joined to the column-beam frame in an upper layer between the layers; a vibration damping device provided between the layers where the low-rigidity diagonal beams are provided, The low-rigidity diagonal beam has a vibration-damping structure in which one of its lower and upper ends is connected to the column-beam frame via either a sliding bearing or a rolling bearing so that it can move horizontally relative to the column-beam frame, and the other end is connected to the column-beam frame via either a rigid joint or a pin joint.

2. 2. A vibration control structure as described in claim 1, further comprising a damper that reduces the relative displacement between the one end of the low-rigidity diagonal beam and the column-beam structure when the inter-layer deformation angle between the layers to which the low-rigidity diagonal beam is provided exceeds a predetermined value.

3. 3. The vibration control structure according to claim 2, wherein the damper reduces only the relative displacement in the axial direction of the low-rigidity diagonal beam and in the direction in which the one end of the low-rigidity diagonal beam moves away from the column-beam structure when the inter-story deformation angle exceeds a predetermined value.

4. the damper is a steel damper extending in the same direction as the axial direction of the low-rigidity diagonal beam and provided between the one end side of the low-rigidity diagonal beam and the beam-column frame, The steel damper and the column-beam frame are connected by pins, 4. The vibration control structure according to claim 3, wherein the steel damper and the one end of the low-rigidity diagonal beam are joined so as to permit relative displacement in the axial direction of the low-rigidity diagonal beam when the inter-layer deformation angle is equal to or less than a predetermined value, permit relative displacement in the axial direction of the low-rigidity diagonal beam in a direction in which the one end of the low-rigidity diagonal beam approaches the column-beam frame when the inter-layer deformation angle exceeds the predetermined value, and restrict relative displacement in the axial direction of the low-rigidity diagonal beam in a direction in which the one end of the low-rigidity diagonal beam moves away from the column-beam frame.

5. 3. The vibration damping structure according to claim 2, wherein the predetermined value of the inter-story deformation angle is 1 / 100 rad.

6. 2. The vibration control structure according to claim 1, wherein a stepped floor for providing spectator seats is provided on the low-rigidity diagonal beams.

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