JP2019073925A - Structure and vibration control method of structure - Google Patents

Abstract

To provide a structure and a vibration control method of a structure which can suppress deformation of an upper structure.SOLUTION: A structure comprises: a roof 11 constituted of a space truss structure; a column 20 supporting the roof 11; and a laminated rubber isolator 30 provided between the roof 11 and the column 20 and allowing rotation. Further, the structure is provided with a vibration control member 35 connecting to the roof 11 and the column 20 at a lateral side of the laminated rubber isolator 30. The vibration control member 35 reduces vibration of the roof 11.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a structure for supporting an upper structure with a lower structure via a support member and a method of damping the structure.

  Conventionally, the roof base isolation structure which supports the roof of the structure of large spaces, such as a stadium, with pillars via base isolation bearings, such as a laminated rubber isolator, is known (for example, refer to patent documents 1). In the technology described in Patent Document 1, laminated rubber is supported on the seismic isolation support portion at the upper end of the column via a lateral displacement absorbing mechanism. The laminated rubber supports the roof side support portion of the roof via a rotational displacement absorbing mechanism. The rotational displacement absorbing mechanism has a base plate, a seat, and a support. The base plate is joined to the upper flange of the laminated rubber, and the seat is joined to the upper part of the base plate. At the upper part of the seat portion, an arc-shaped convex portion which is convex upward is formed. The lower part of the lower part of the support | pillar part is an opening side, and the recessed part in which the bottom part (upper surface) is circular arc shape is formed. The concave portion of the support portion slidably contacts the convex portion of the seat portion.

JP, 2016-33313, A

  In a large space structure, the roof may be supported by a long span where the distance between adjacent columns is long. In this structure, when the wind blows through the upper surface (or the upper and lower surfaces) of the roof, the roof may vibrate in the vertical direction.

  A structure that solves the above problems is a structure provided with an upper structure, a lower structure, and a support member provided between the upper structure and the lower structure and permitting rotation. A damping member connected to the upper structure and the lower structure is provided on a side of the support member, and the vibration damping member is rotatable to at least one of the upper structure and the lower structure. Attached.

  According to the present invention, vibrations in the upper structure can be suppressed.

It is a general view of a structure in an embodiment, and (a) is a perspective view and (b) is a front view. It is an enlarged view of the principal part of the structure in an embodiment, and (a) is a perspective view of the roof part supported by the pillar, (b) is a perspective view in the state where some components were removed in (a), (C) shows the top view of the attachment part of a pillar. It is explanatory drawing of a motion of the damping member at the time of wind force operation in embodiment, (a) is a front schematic diagram of a roof, (b) is a schematic diagram before wind power is applied, (c) is after wind power is applied Diagram of. It is explanatory drawing of a motion of the damping member at the time of horizontal force action by earthquake in embodiment, (a) is a schematic diagram before horizontal force is added, (b) is a schematic diagram after horizontal force is applied.

  Hereinafter, with reference to FIGS. 1 to 4, an embodiment in which a structure and a method of damping a structure are embodied will be described. The present embodiment will be described as a structure having a roof in a large space such as an outdoor stadium.

  FIG. 1A shows the overall outer shape of the structure 10 of the present embodiment. The structure 10 includes a roof 11 as an upper structure and four columns 20 as lower structures disposed below the roof 11. The roof 11 is comprised by the truss structure, and the planar shape of the whole is square shape. Each pillar 20 is disposed corresponding to each corner of the roof 11. In the present embodiment, the distance between the pillars 20 in the X direction of the roof 11 is longer than the distance between the pillars 20 in the Y direction orthogonal to the X direction in the horizontal plane.

  As shown in FIG. 1B, the roof 11 includes an upper chord 11a, a lower chord 11b, a diagonal 11c, and a bundle 11d. The roof 11 of the present embodiment has a three-dimensional truss structure in which the diagonal members 11 c are arranged in the shape of a quadrangular pyramid at the intersections with the upper chord members 11 a and the lower chord members 11 b. Moreover, in the outer peripheral part of the roof 11, the lower chord material 11b is connected to the end of the upper chord material 11a while being inclined upward on the outer side of the pillar 20.

  The column 20 includes a plurality of longitudinal chord members 21 extending in the vertical direction, a diagonal member 23 that obliquely connects the longitudinal chord members 21, and a horizontal bundle material 24 that couples horizontally. At the upper end of the column 20, a mounting portion 25 and a fixed end 26 are provided at a portion intersecting the roof 11.

  FIG. 2A is an enlarged perspective view showing the periphery of a portion where the roof 11 and the pillar 20 intersect. FIG. 2 (b) shows a part of the truss structure of the roof 11, a diagonal member 23 of the column 20, and a lateral bundle member in order to clearly show the arrangement of the laminated rubber isolator 30 and the damping member 35 in FIG. 2 (a). 24 is a perspective view with the fixed end 26 removed. FIG.

  As shown in FIG. 2A, a mounting portion 25 is fixed below the lower end portion of the roof 11 at the top of the four longitudinal string members 21 of the column 20. As shown in FIG. Further, a fixed end portion 26 for fixing the longitudinal chord member 21 is fixed to the upper end portion of the longitudinal chord member 21 above the upper end portion of the roof 11. The diagonal members 23 and the horizontal bundle members 24 are connected to the longitudinal chord members 21 which are separated in the X direction between the attachment portion 25 and the fixed end 26.

  In the present embodiment, the longitudinal chord 21 of the column 20 is disposed between the two upper chords 11 a of the roof 11 (and between the two lower chords 11 b). Therefore, the horizontal distance between the longitudinal chords 21 is smaller than the distance between the upper chord 11a (and the lower chord 11b).

  Further, one end portion of a damping member 28 for damping horizontal vibration is attached to the longitudinal chord member 21. The other end of the damping member 28 is attached to the roof 11 via an attaching member (not shown). As the damping member 28, for example, a viscous damping damping member such as an oil damper can be used.

As shown in FIG. 2B, the mounting portion 25 includes an outer mounting portion 25a, a fixing portion 25b, a connecting portion 25c, and a connecting portion 25d.
As shown in FIG. 2C, the outer attachment portion 25a is a cylinder whose horizontal cross section is a square frame, and is disposed so as to surround the outer periphery of the longitudinal chord member 21.
The fixing portion 25 b extends in the Y direction from each longitudinal chord member 21, and secures each longitudinal chord member 21 and a frame member in the X direction of the outer attachment portion 25 a.
The connecting portion 25 c extends in the X direction and the Y direction, and connects the four longitudinal chords 21.
The connecting portion 25 d connects the central portion of the frame member in the X direction of the outer attachment portion 25 a and the central portion of the member in the X direction of the connecting portion 25 c.

  Two laminated rubber isolators 30 are mounted and fixed on the center of the outer attachment portion 25a of the attachment portion 25 and the upper surface of the connecting portion 25d. The lower chord 11 b of the roof 11 is placed on the laminated rubber isolator 30. Thereby, the laminated rubber isolator 30 functions as a support member that supports the roof 11 and allows rotation of the roof 11 with the Y axis as the central axis.

On the other hand, lower end portions of four damping members 35 are attached to the connecting portion 25c extending in the Y direction. Two damping members 35 are disposed apart from each other in one connection portion 25c. For this reason, the damping members 35 are positioned on both sides in the X direction across the laminated rubber isolator 30.
In the present embodiment, as the damping member 35, for example, a viscous damping member such as an oil damper can be used. The damping member 35 includes a cylinder and a rod that protrudes from the cylinder and extends and contracts in the horizontal direction.

At the lower end of each damping member 35, a universal joint is mounted on the upper surface of the mounting portion 25 of the column 20 so as to be rotatable 360 degrees.
Each damping member 35 extends in the vertical direction.
A universal joint is provided at the upper end of each damping member 35. The universal joint is rotatably attached to the lower surface of the mounting member 15 by 360 degrees. The mounting member 15 includes a pair of fixing portions disposed in the X direction and fixed to the upper chord member 11a, and a pair of connecting portions connecting the pair of fixing portions and disposed in the Y direction. .

Next, the operation and action of the structure 10 configured as described above will be described using FIGS. 3 and 4.
First, the case where the roof 11 receives a crosswind in the Y direction will be described using FIG. 3.
In this case, as shown in FIG. 3A, there is an obstacle such as a pillar in the wind path under the roof 11, but there is no obstacle in the wind path above the roof 11. For this reason, the wind speed above the roof 11 is higher than the wind speed below the roof 11. As a result, lift is generated on the roof 11, and the roof 11 is bent in a shape in which the center is convex upward and is deformed in the vertical direction (vertical direction).

  In this case, the laminated rubber isolator 30 supporting the roof 11 on the left side of FIG. 3A is in the state shown in FIG. 3C from the state shown in FIG. 3B (the state before the wind blows). . Specifically, the laminated rubber isolator 30 permits rotation about the Y direction as a central axis, and the upper surface is inclined in the direction of the arrow R1 to be rotationally deformed. Then, the damping members 35 on both sides of the laminated rubber isolator 30 expand and contract in accordance with the movement of the upper chord member 11 a attached via the attachment member 15. Thereby, the damping member 35 performs a damping operation to suppress the vibration of the roof 11.

Next, the case where horizontal force is applied to the roof 11 will be described using FIG. 4. Such horizontal force is generated, for example, by an earthquake or the like.
When a horizontal force F1 is applied to the roof 11 in the state shown in FIG. 4A, the state shown in FIG. 4B is obtained. Specifically, displacement (horizontal displacement) occurs in the horizontal direction at the upper end of the roof 11, and horizontal deformation occurs in the structure 10. In this case, since the laminated rubber isolator 30 supports the lower chord 11b of the roof 11, the upper surface is pulled in the horizontal direction following the movement of the lower chord 11b, and is deformed horizontally. The damping member 35 follows the movement of the upper string member 11 a of the roof 11 and extends while rotating about the Y direction as a central axis. In this case, the damping operation of the damping member 35 suppresses the horizontal vibration of the roof 11.
In this case, the damping member 28 shown in FIG. 2A also expands and contracts in the horizontal direction to perform a damping operation to suppress the vibration of the roof 11.

According to the present embodiment, the following effects can be obtained.
(1) The structure 10 of the present embodiment is provided between the roof 11 and the column 20, and the damping member 35 for reducing the vibration of the roof 11 at the side of the laminated rubber isolator 30 that allows rotation. It is connected to the roof 11 and the pillar 20. In this case, the damping member 35 is rotatably attached to the roof 11 and the column 20. Thereby, the deformation | transformation of the up-down direction of the roof 11 which arose by the wind etc. can be suppressed.

  (2) The damping member 35 of the present embodiment is erected between the roof 11 and the column 20 and is provided on both sides of the laminated rubber isolator 30. Thereby, the deformation | transformation of the up-down direction of the roof 11 can be suppressed efficiently.

(3) Since the damping member 35 of the present embodiment is a viscous damping member, it is possible to damp the vibration generated in the vertical direction of the roof 11.
(4) Since the damping member 35 of the present embodiment extends following the movement of the upper chord member 11a of the roof 11 according to the horizontal force, the deformation of the roof 11 in the horizontal direction caused by the horizontal force due to an earthquake or the like Can be suppressed and the vibration can be damped.

  (5) In the present embodiment, one end portion of the damping member 28 for damping horizontal vibration is attached to the longitudinal chord member 21 of the column 20. Thereby, the vibration of the roof 11 which horizontal force acted can be reduced.

  (6) The damping member 35 of the present embodiment is connected to the upper chord 11a of the roof 11 of the truss structure and the mounting portion 25 of the column 20 on which the laminated rubber isolator 30 is mounted and fixed. Thereby, since the long damping member 35 can be arrange | positioned, the movable range of a rod can be lengthened and the vibration by big deformation | transformation can be reduced.

The above embodiment may be modified as follows.
-In the structure 10 of the said embodiment, the laminated rubber isolator 30 was arrange | positioned between the roof 11 and the pillars 20. The support member provided between the upper and lower structures and the lower structure and permitting rotation is not limited to the laminated rubber isolator 30, and may be another support member such as a spherical slide support. In the case of using a spherical sliding bearing, for example, concave spherical plates are provided on the lower and upper structures so that the plates face each other. And the slider which slides on both plates is provided. Thereby, the support member allows rotation on the upper and lower surfaces of the slider.

  The viscous damping member is used as the damping member 35 of the above embodiment. The damping member 35 is not limited to a viscous damping member as long as the damping member 35 can suppress displacement (vibration) in the vertical and horizontal directions of the upper structure, and for example, a displacement dependent damping member such as a friction damper Or a visco-elastic damping member.

  In the above embodiment, the damping member 35 is attached to the upper chord 11 a of the roof 11 and the outer attachment portion 25 a of the column 20. The mounting position of the damping member 35 is not limited to these, as long as the damping member 35 can be connected to the upper structure and the lower structure, for example, it may be connected to the lower chord 11b and the fixed end 26.

-The structure 10 of the said embodiment is equipped with the roof 11 as an upper structure, and the pillar 20 as a lower structure. The upper and lower structures are not limited to these. The upper structure may be a roof or the like other than the truss structure, and the lower structure may be a pillar or the like other than the truss structure.
Further, the pillar 20 of the above embodiment includes the mounting portion 25 disposed below the lower end of the roof 11 and the fixed end 26 disposed above the upper end of the roof 11. The configuration of the column 20 is not limited to this. For example, in the column 20, the members above the mounting portion 25 (the longitudinal chord member 21, the diagonal member 23, the transverse bundle member 24, and the fixed end 26) may be removed. Also in this case, the damping member 35 on the side of the support member may connect the roof 11 and the pillar 20. For example, the support member is placed on the mounting portion 25 of the column 20, and the damping member 35 is attached between the support member 25 and the roof 11.

  In the damping member 35 of the above embodiment, the damping members 35 are disposed on both sides of the laminated rubber isolator 30. The damping members 35 disposed on the side of the support member may not be on both sides but only on one side.

  DESCRIPTION OF SYMBOLS 10 ... Structure 11 11 Roof 11a Upper chord material 11b Lower chord material 11c 23 Diagonal material 11d Bundle material 15 Mounting member 20 Column 21 longitudinal chord material 24 Horizontal bundle Material 25 25 mounting portion 25a outer mounting portion 25b fixing portion 25c connection portion 25d connection portion 26 fixed end portion 28 35 damping member 30 laminated rubber isolator.

Claims (5)

A structure comprising an upper structure, a lower structure, and a support member provided between the upper structure and the lower structure and permitting rotation.
A damping member coupled to the upper structure and the lower structure is provided on the side of the support member;
A structure characterized in that the damping member is rotatably attached to at least one of the upper structure and the lower structure.   The structure according to claim 1, wherein the damping member is erected between the upper structure and the lower structure to damp vertical and horizontal vibrations of the upper structure. object.   The damping member is rotatably attached to the upper structure and the lower structure so as to follow the horizontal displacement of the upper structure which horizontally deforms the support member. A structure according to claim 1 or 2. The upper structure is a roof having a truss structure,
The lower structure includes a mounting portion on which the support member is mounted and fixed.
The structure according to any one of claims 1 to 3, wherein the damping member is connected to the upper chord member of the truss structure of the upper structure and the mounting portion. A vibration control method in a structure comprising an upper structure, a lower structure, and a support member provided between the upper structure and the lower structure and permitting rotation.
A damping member rotatably attached to at least one of the upper structure and the lower structure on the side of the support member damps the vibration of the upper structure that deforms the support member. Vibration control method of the structure to be.

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