JP4781058B2 - Building seismic control structure - Google Patents

Description

The present invention relates to a vibration control structure capable of effectively attenuating vibration caused by an earthquake using a vibration control brace in a wooden building.

In a wooden building, a seismic brace incorporating a damper such as a viscoelastic damper in which a viscoelastic body is bonded between superposed plates is installed in a frame frame formed of columns and horizontal members. A vibration control structure that absorbs vibrational energy by causing a damper to damp with an axial force applied to the vibration control brace during vibration is often used. When this damping brace is joined to the joint between the column of the frame frame and the horizontal member, as disclosed in, for example, Patent Documents 1 and 2, the vertical portion fixed to the column and the beam (the horizontal frame) Use of an attachment member comprising an L-shaped fixing plate composed of a horizontal portion fixed to the material) and a connecting plate fixed to the inner side of the fixing plate in parallel with the frame surface and connected to the end of the brace Can be considered. By using such an attachment member, it is possible to easily install the vibration control brace.

Japanese Patent Laid-Open No. 2-85437 JP-A-8-277588

  In this mounting member, the connecting plate is fixed in such a manner as to straddle both the horizontal portion and the vertical portion of the fixing plate, and therefore the tilt of the column with respect to the horizontal member is firmly restricted by the connecting plate at the joint. become. Therefore, when vibration is applied to the frame frame in the horizontal direction, bending occurs only at the center of the column, and the column may be buckled by a vertical load. In addition, since the displacement of the frame frame is reduced and the damper of the vibration control brace is not sufficiently displaced, the vibration control function is insufficient.

  Therefore, the present invention is capable of effectively preventing the buckling of the column during vibration even when the above-described mounting member is used for the joint, and is capable of suitably exerting the damping function by the damper. The purpose is to provide a structure.

In order to achieve the above object, according to the first aspect of the present invention, the attachment member is configured such that the connecting plate is connected across both the vertical portion and the horizontal portion of the fixed plate , and the amount of connection to the vertical portion is small. In addition, it is assumed that the length along the axial direction of the column is 20 mm or less from the surface of the horizontal portion, and the tilting of the column with respect to the horizontal member is allowed at the joint at the time of vibration. And

According to the first aspect of the present invention, the central portion of the column is not bent at the time of vibration, and there is no possibility of buckling due to a vertical load. Further, the deformation of the shaft frame is allowed and the damping function by the damper can be sufficiently exhibited.
According to the second aspect of the present invention, in addition to the effect of the first aspect, a suitable mounting member that can reliably allow the column to be tilted at the time of vibration in the wooden frame is obtained.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a front view showing an example of a frame frame of a building to which the vibration control structure of the present invention is applied, and is used for a wooden house. This frame assembly 1 includes a pair of left and right columns 2 and 2 arranged at equal intervals, a beam 3 as a horizontal member laid between the upper ends of the columns 2 and 2, and a lower end of the columns 2 and 2. Similarly, the base 4 as a horizontal member is installed, and vibration control braces 5 and 5 incorporating viscoelastic dampers are installed vertically above and below each frame surface so as to be symmetrical with respect to the vertical axis. This is a so-called K brace structure. In addition, in FIG. 1, it has the structure where the two pillar frames 1 and 1 were installed adjacently using the center pillar 2 in common.

  As shown in FIG. 2, the vibration control brace 5 is loosely inserted so as to protrude to one end side of the outer sleeve 6 with a rectangular outer cross section and a flat outer sleeve 6 and approximately half the length of the outer sleeve 6. It consists of an inner plate 7 and a pair of viscoelastic bodies 8, 8 which are between the outer sleeve 6 and the inner plate 7 and are bonded to the opposing surfaces. Reference numeral 9 denotes a long nut fixed to the end of the outer sleeve 6 opposite to the inner plate 7. Reference numeral 10 denotes a pin hole formed in a protruding portion of the inner plate 7 from the outer sleeve 6.

  In each damping brace 5, the protruding side of the inner plate 7 is joined to the joint between the central column 2, the beam 3 and the base 4, and the long nut 9 side of the outer sleeve 6 is joined to the intermediate part of the left and right columns 2, respectively. Has been. First, as shown in FIG. 3, the inner plate 7 includes a connecting plate 12 parallel to the frame surface, and an L-shaped fixing plate 13 to which the connecting plate 12 is welded inward along a longitudinal center line. It connects via the attachment metal fitting 11 as an attachment member which consists of. The horizontal portion 14 of the fixing plate 13 of the mounting bracket 11 is fixed to the beam 3 and the vertical portion 15 is fixed to the column 2 by screws, and the pin holes 10 of the inner plate 7 are connected to the connecting plate 12 by pins 16. The connecting plate 12 here has an upper end welded over substantially the entire length in the longitudinal direction of the horizontal portion 14, and the side end has a slight length S (here, from the surface of the horizontal portion 14 to the vertical portion 15). It is welded only at 20mm).

  On the other hand, as shown in FIG. 4, the outer sleeve 6 is welded in parallel with the frame surface along the longitudinal center of the joining plate 18 and a rectangular joining plate 18 screwed to the side surface of the column 2. The support plate 19 is connected to an intermediate portion of the column 2 via a mounting bracket 17 including a sleeve 20 fixed obliquely to the tip of the support plate 19. That is, the entire screw bolt 21 inserted into the sleeve 20 is screwed into the long nut 9 of the outer sleeve 6, and the nuts 22, 22... Are screwed into the full screw bolt 21 at both ends of the sleeve 20 and the distal end side of the long nut 9. Then, the outer sleeve 6 is fixed by positioning all the screw bolts 21. The connection of the vibration control brace 5 by the mounting brackets 11 and 17 is also symmetrical between the left and right shaft frames 1 and 1.

  In the frame frames 1 and 1 configured as described above, when an external vibration is applied due to an earthquake, an external force in a horizontal direction parallel to the frame surface is alternately applied in the opposite direction, so that each frame frame 1 attempts to deform left and right. To do. At this time, the upper and lower ends of the central column 2 are hardly subjected to bending restriction by the connecting plate 12 of the mounting bracket 11, so that the angle with respect to the beam 3 and the base 4 is changed in the same manner as the left and right columns 2, and the upper column is bent. It tilts without allowing the deformation of each frame 1. As a result of this deformation, axial tensile force and compressive force are alternately applied to the columns 2 and 2 and the upper and lower vibration control braces 5 and 5. Therefore, in the vibration control brace 5, the outer sleeve 6, the inner plate 7, Move in opposite directions to each other in the longitudinal direction, causing the viscoelastic body 8 between both plates to shear and deform in the longitudinal direction. The deformation of the viscoelastic body 8 absorbs vibration energy and causes a damping action.

  As described above, according to the vibration-damping structure of the above embodiment, the mounting bracket 11 is such that the connecting plate 12 is mostly connected to the horizontal portion 14 of the fixing plate 13 and slightly connected to the vertical portion 15. As connected, the tilting of the column 2 with respect to the beam 3 and the base 4 is allowed at the joint at the time of vibration, so that the central part of the column 2 is not bent at the time of vibration, and buckling due to vertical load is performed. The risk of being lost. In addition, the deformation of the shaft frame 1 is allowed and the vibration control function by the viscoelastic damper can be sufficiently exhibited.

  The form of the shaft frame is not limited to the K brace type as in the above form, but a pair of vibration control systems are provided for the upper half and the lower half of each frame surface, as in the frame frames 1a and 1a shown in FIG. The braces 5 and 5 are crossed so as not to interfere with each other, and fixed at the joint between the column 2 and the beam 3 and the base 4 by the mounting bracket 11 and at the intermediate portion of the column 2 by the mounting bracket 17. There is no problem. When a plurality of frame frames are provided next to each other as described above, it is desirable that the upper and lower vibration control braces be arranged in a straight line between the adjacent frame frames as shown in FIG. This is because, if arranged in this way, not all the shaft frames but the entire frames are integrated and the vibration control function is exhibited.

  On the other hand, as shown in FIG. 6, the pair of vibration control braces 5 and 5 are crossed diagonally on the frame surfaces of the shaft frames 1b and 1b so as not to interfere with each other, and the upper and lower ends are respectively attached to the mounting brackets 11 and 11, respectively. 11 can also be used. Here, the joining member 23 is connected to the outer sleeve 6 of the vibration control brace 5, and the joint plate 24 fixed to the end of the joining member 23 is pin-coupled to the mounting bracket 11.

In each of the above embodiments, the mounting bracket 11 is connected so that the connecting plate 12 is mostly connected to the horizontal portion 14 of the fixing plate 13 and slightly connected to the vertical portion 15. In the case of wooden construction, if the length of the connection to the vertical part is set to 20 mm or less as in the above embodiment, tilting of the column can be allowed with certainty during vibration. It is.
Further, the fixing structures of the fixing plate and the shaft assembly frame, and the fixing plate and the connecting plate are not limited to the above forms, and may be appropriately replaced with other means such as bolts and welding. Similarly, the fixing structure of the connecting plate and the vibration control brace is not limited to pin coupling, and welding or the like can be employed.

In addition, the viscoelastic damper to be incorporated in the vibration control brace is not limited to the combination of the sleeve and the plate in the above form, but a viscoelastic body can be adhered between a plurality of stacked plates, or a plurality of sleeves having different diameters can be coaxially connected. It is possible to change the design as appropriate, such as loose insertion and bonding a viscoelastic body between the sleeves. Of course, other dampers such as an oil damper may be incorporated instead of the viscoelastic damper.
Further, the present invention is not limited to the above-described form in which a plurality of frame frames to which the present invention is applied, and a form in which the frame frames are arranged individually or in a distributed manner in a building can be employed.

It is a front view of a shaft frame. It is explanatory drawing of a damping brace. It is explanatory drawing of the connection structure in a joint part. It is explanatory drawing of the connection structure in the intermediate part of a pillar. It is a front view of the axial frame of the example of a change. It is a front view of the axial frame of the example of a change.

Explanation of symbols

1, 1a, 1b ··· Frame frame, 2 ·· Column, 3 ·· Beam, 4 ·· Base, 5 ·· Damping brace, 6 ·· Outer sleeve, 7 ·· Inner plate, 8 ·· Viscoelasticity Body 11 ..Mounting bracket 12 ..Connecting plate 13 ..Fixing plate 14 ..Horizontal portion 15 ..Vertical portion 17 .. Mounting bracket

Claims (1)

A seismic brace incorporating a damper that produces a damping action by an external force in the axial direction in a wooden frame formed of columns and horizontal members, at least one end of which is a combination of the columns and horizontal members. It is constructed so as to be connected to the mouth part, and one end of the seismic control brace and the joint part are connected to a connecting plate that is parallel to the frame surface and to which one end of the seismic control brace is connected. And a vibration control structure of a building connected by using an attachment member composed of an L-shaped fixing plate in which a vertical portion is fixed to the column and a horizontal portion is fixed to the horizontal member,
The attachment member is connected to the connecting plate across both the vertical portion and the horizontal portion of the fixed plate , and the amount of connection to the vertical portion is determined from the surface of the horizontal portion to the axis of the column. The building is controlled so as to be 20 mm or less in length along the direction, and at the time of vibration, the tilting of the column with respect to the horizontal member is allowed in the joint portion. Construction.

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