JP5530129B2 - Damping damper for building damping mechanism - Google Patents

Description

  The present invention relates to a vibration damper that is used for a vibration control mechanism of a building and absorbs vibration caused by an earthquake to reduce damage to the building.

  A building vibration control mechanism is mainly composed of a vibration transmission member and a vibration damper, and a concrete structure of use includes a cane type, a brace type, or a type in which a pair of pillars are coupled. And, for example, the left and right pillars that make up the wall of the building and the vibration damper are connected by vibration transmission members, that is, the wall incorporating the vibration control mechanism normally maintains rigidity, but due to earthquakes and winds, etc. When a large vibration force (inertial force with the mass of the building due to the movement of the ground in an earthquake) acts, it is transmitted to the vibration damper via the vibration transmission member, and the vibration energy is absorbed by the displacement of the vibration damper. The As a result, the shaking of the building is alleviated and damage to the building is reduced.

  Various damping dampers have been proposed, but the energy absorption performance when a member such as a steel plate or viscoelastic member (historic member) deforms by drawing a hysteresis curve against alternating repeated loads. One of them is a damper that uses the.

  On the other hand, among vibration damping dampers, especially those using a hysteresis member, even if there is no abnormality in appearance, as a result of repeated shaking, the original energy absorption performance may be deteriorated in terms of material. Therefore, for example, when it is determined that a damaged building can be repaired after a large earthquake, it may not be determined whether the vibration damper can be used continuously.

In addition, it is difficult to find an objective basis for persuading the client on the spot when replacement is necessary.
When the safety level of a house is 100 as a standard, and a newly built building with a safety level of 150 is damaged by an earthquake and has a safety level of about 90, the safety level can be increased to about 120 by replacing the damping damper. If it can be improved, it is worth replacing the old history damper with a new one.

The following patent document is an example of a vibration damper.
The damper body 5 (FIGS. 6 and 7) of Patent Document 1 has a structure in which both ends of a plurality of H-shaped steels 52 are fixed between a column member mounting member 21 and a brace mounting member 22.
The elastic-plastic damper 7 (FIGS. 9 to 12) of Patent Document 2 has a structure in which both ends of a vibration energy absorption lattice 16 in which a slit is formed in a steel plate between base plates 15 on both sides are fixed.
The steel damper 11 of Patent Document 3 has a structure in which both ends of a plurality of vertical ribs 11 a (made of steel) are fixed between a T-shaped bracket 10 and a connecting plate 12.
In the earthquake-proof reinforcement structure of Patent Document 4, a viscoelastic damper 3 filled with a viscoelastic body 6 is attached to a joint portion between a column 1 and a beam 2.
The damping damper of Patent Document 5 discloses a structure that uses a combination of a viscoelastic material 12 and an elastic material 14.
In the vibration damping structure of Patent Document 6, beams 2 and 2 passed between columns 1 and 1 are further coupled by intermediate column brackets 4 and 4, and a viscoelastic damper 6 is attached between the intermediate column brackets 4 and 4.
All of these are hysteresis members (H-shaped steel 52, vibration energy absorption grid 16 and longitudinal ribs 11a, viscoelasticity, which are displaced between the first base plate and the second base plate in a hysteresis loop with respect to alternately repeated loads. It can be said that the both ends of the body 6 and the viscoelastic material 12 are fixed.

Open 2006-207292 Japanese Patent No. 2516576 JP 2002-201817 A Opening 2000-160683 JP-A-7-197969 JP-A-5-287933

  It is possible to easily determine whether or not the damping damper used for the damping mechanism can be continuously used.

A scale member is attached between the first and second base plates to which both ends of the hysteresis member of the vibration damper are fixed. The scale member shows the change (breaking, cracking, deformation, discoloration, paint peeling, etc.) that can be seen with the eye corresponding to the fatigue level set on the history member under the repeated repeated load like the history member And
As the scale member, a steel plate having both ends fixed between the first and second base plates may be used. In this steel plate, a portion where the stress at the time of deformation is concentrated is made, and the change appearing there corresponds to the fatigue level set by the history member at that time, and an indicator portion showing a visible change and There are things to do.

  By visually observing changes in the scale members, it is possible to easily grasp whether or not the damping damper has undergone a displacement that reaches the set fatigue level, and it is possible to continue using the damping damper and obtain objective judgment materials. It is done. In addition, it is easy to obtain the consent of the owner for replacement when continuous use is impossible.

The front view of a wall part. The front view of a damping damper. The perspective view which decomposes | disassembles and shows a damping damper. The perspective view of a scale member (other example 1). The front view which shows the operating state of a scale member (other example 1). The perspective view of a scale member (other example 2). The front view of the wall part which attached the other damping damper. The example of the scale member attached to the other damping damper is shown, (A) is a sectional view and (B) is a plan view.

FIG. 1 is a wall portion in a wooden frame construction method house. A base 2 is fixed to a top surface of a foundation 1 with anchor bolts 3, and left and right columns 4 and 5 are fitted with tenons on column bases to stand upright. Then, these column heads are connected to each other, and the beam 6 is assembled by mortise fitting.
A vibration damping mechanism 7 is incorporated between the left and right columns 4 and 5.
The damping mechanism 7 includes a damping damper 8 and upper, lower, left and right brace members 9a, 9b, 9c, 9d for coupling the damping damper 8 to the left and right columns 4, 5.

The vibration damper 8 (FIGS. 2 and 3) has a plurality of vibration absorbing fins 12 (history members) and one scale member 13 arranged in parallel between the first and second base plates 10 and 11, and both ends thereof are arranged. The first and second base plates 10 and 11 are fixed by welding.
In this embodiment, the base plate 10 is a press-molded product including a relatively wide plate portion 14 and a narrow contact portion 15 formed by bending an edge of the plate portion 14 at a right angle.
Screw holes 16 are formed in a row in the plate portion 14. The screw hole 16 is a long hole that is long in the lateral direction in consideration of the convenience when the plate portion 14 is fixed to the brace member 9 with a bolt or the like.
The second base plate 11 has the same configuration, and the first base plate 10 can be used upside down.

In this embodiment, the vibration-absorbing fin 12 is a U-shaped steel plate press-molded product, and has both ends bent to the same side to form leg portions 17, and a portion between them is connected by a deformable portion 18. As the steel plate, it is preferable to use a steel plate (for example, 225 N / mm) having a yield point having a thickness of 6 mm that is relatively lower than that of a normal steel plate. In this embodiment, a rectangle having a thickness of 6 mm, a width of 35 mm, and a length of 180 mm. 40 mm of both ends of the plate are bent to the same side and press-formed into a U-shape.
The size of the vibration-absorbing fin 12 depends on the rigidity and deformation capacity expected of the vibration damper 8 and the number of fins used.
It should be noted that the deformation of the vibration absorbing fins 12 is gradually and gradually shifted from the central portion of the deformable portion 18 to both sides so that the deformation of the vibration absorbing fin 12 mainly occurs from the central portion of the deformable portion 18 according to the alternating repeated displacement accompanying the vibration. It may be formed narrow.

  In this embodiment, the scale member 13 (FIG. 3) is based on the vibration absorbing fins 12 and includes the leg portions 17 on both sides and a deforming portion 18 that communicates between them, like the vibration absorbing fins 12. The deforming portion 18 is formed with an indicator portion 20 whose width is narrowed to about half by a slit 19 formed from both sides.

The indicator portion 20 is a location where stress is concentrated when the scale member 13 is deformed. The distance of the index portion 20 is set to be, for example, about 60% of the vibration absorbing fin 12. That is, the scale member 13 is designed to break before the vibration absorbing fins 12 are broken. Therefore, the indicator unit 20 indicates that the vibration damping performance of the vibration absorbing fins 12 has deteriorated to about 60% with a visible change of breakage. The degree of fatigue of the vibration absorbing fins 12 indicated by the scale member 13 being broken can be set by determining the depth of the slit 19 in the deformed portion 18. The correspondence between the width of the index portion 20 and the fatigue level of the vibration absorbing fin 12 can be determined by experiment. In this way, by adjusting the width of the scale member 13 with respect to the vibration absorbing fin 12, the fatigue performance can be confirmed and certified in advance.
The vibration absorbing fins 12 and the scale member 13 are fixed by welding the leg portions 17 on both sides to the contact portions 15 of the base plates 10 and 11.

In FIG. 1, the damping damper 8 and the columns 4 and 5 are fixed by a bolt or the like using a brace member 9, and the damping mechanism 7 is securely fixed so that there is no slip between the columns 4 and 5.
When strong vibration due to an earthquake or the like is applied to the building, the pillars 4 and 5 in the wall portion receive alternating repeated loads inclined in the left or right direction in FIG. This load is transmitted to the vibration damper 8 via the brace member 9. In the vibration damper 8, the first and second base plates 10 and 11 are displaced in the vertical direction, and this is transmitted to the vibration absorbing fins 12 and the scale member 13. Each vibration absorbing fin 12 of the damping damper 8 is displaced by drawing a hysteresis loop surrounding a certain area, and at that time, vibration energy is absorbed (converted into heat) according to the hysteresis loop. For this reason, the influence which a vibration gives to a building can be relieved.

On the other hand, the scale member 13 is similarly displaced, but the breakage occurs earlier in the index portion 20 of the scale member 13 than the vibration absorbing fins 12. For this reason, when there is a break in the index portion 20 at the time of inspection, it can be surely grasped visually that the repeated yield strength of the vibration absorbing fins 12 is 60% or less.
Therefore, if the limit of continuous use of the vibration damper 8 is repeatedly set as a time when the proof stress is 60%, it can be immediately determined that it is a replacement time. In addition, it is easy to convince the owner that continuous use is impossible, with the fracture situation as objective evidence.
When the vibration damper 8 is replaced, the screws (bolts) fixing the first and second base plates 10 and 11 and the brace member 9 may be removed.

4 to 6 show other examples of the scale member 13.
The scale member 13a shown in FIG. 4 includes leg portions 17a and 17b at both ends and a deformable portion 18 that connects them, like the vibration absorbing fin 12, and an index member 21 is attached to the deformed portion to form the index portion 20. The index member 21 includes a fixed portion 22, a bar-shaped sensing portion 23, and a displacement maintaining member 24 that connects the base portion of the sensing portion 23 and the fixed portion 22. The displacement maintaining member 24 is a metal plate that bends easily like a lead / lead alloy plate but has almost no spring back.
As shown in FIG. 4, the index member 21 is used by screwing or firmly adhering to one of the vibration absorbing fins 12. The vibration absorbing fin 12 to which the index member 21 is attached becomes the scale member 13.

The scale member 13a functions as follows.
When the first base plate 10 of the vibration damper 8 is displaced upward with respect to the second base plate 11 due to the vibration, one leg 17a of the scale member 13a is moved to the other leg 17b as shown in FIG. On the other hand, it is displaced upward, and the deformed portion 18 is inclined upward. Since this inclination does not occur at the location of the fixing portion 22 close to the other leg portion 17b, the displacement maintaining member 24 bends as the tip of the sensing portion 23 moves upward. This bent state is maintained without returning even if the deformed portion 18 is inclined in the reverse direction (downward) due to the characteristics of the material.

Here, the maximum load P received by the vibration-absorbing fin 12 from the inclination angle of the sensing unit 23, the number of main earthquakes that occurred during the period after construction, and the large amplitude in one earthquake (for example, the maximum amplitude and the The number of vibration waves having an amplitude of about 80% can be understood from experiments and measurement data. From these, it is possible to estimate the degree of fatigue when the damping damper 8 is caused by the displacement repeatedly received at the maximum load P after construction. Further, the actual degree of fatigue is, for example, 60 from the estimated degree of fatigue. %.
Accordingly, it is possible to visually determine whether the vibration damper 8 can be used continuously by the inclination of the sensing unit 23.

The scale member 13b shown in FIG. 6 is obtained by applying a paint to the deformed portion 18 of the vibration absorbing fin 12 to form the indicator portion 20. The scale member 13b uses a one-component type polyurethane resin paint whose coating is hard (brittle) to some extent. . When the displacement of the vibration absorbing fins 12 exceeds a set limit, the coating film is cracked or peeled off.
And since the displacement of the set limit and the magnitude of the load on the vibration absorbing fin 12 can be grasped, it is possible to estimate the degree of fatigue when there is a visible crack or peeling as in the above case. . As a result, it is possible to visually determine whether the vibration damper 8 can be continuously used by the scale member 13b.

FIG. 7 shows an example in which a vibration damper 8 using a viscoelastic member as a hysteresis member is used.
The vibration damper 8 (FIG. 8) is formed by filling a viscoelastic member 25 between the first base plate 10 and the second base plate 11 arranged in parallel and bonding them. The first base plate 10 is fixed to the left vibration transmission member 26, the second base plate 11 is fixed to the right vibration transmission member 27, and the other sides of the vibration transmission members 26 and 27 are fixed to the left column 4 and the right column 5, respectively. Thus, a wall damping mechanism 7 is constructed.
The both ends of the scale member 13 c are fixed across the first base plate 10 and the second base plate 11 of the vibration damper 8.

In this case, the scale member 13c is a flat plate made of steel and has a thin and constricted central portion that becomes the indicator portion 20. One end is fixed to the first base plate 10 by welding, and the other end is fixed to the second base plate 11 with a bolt nut 28 after the attachment of the vibration damping mechanism 7 is completed.
When the wall vibrates due to a horizontal force caused by an earthquake or a strong wind, the vibration displacement is transmitted to the damping damper 8 through the columns 4 and 5 and the vibration transmitting members 26 and 27, and the vibration energy is absorbed.
At this time, the first base plate 10 and the second base plate 11 are displaced up and down. In response to this displacement, the scale member 13c is deformed, and the displacement exceeding the set limit remains visible in the indicator portion 20 as a twist or crack.
Similarly to the above, the fatigue performance of the viscoelastic member 25 can be confirmed and certified in advance by adjusting the width and length of the scale member 13. Thereby, it becomes a standard which judges whether continuous use is possible.

The embodiment has been described above.
The hysteresis member of the damping damper 8 is not limited to the shape of the vibration absorbing fins 12 and can take various forms such as a lattice shape and a bar shape.
The scale member 13 is not based on the vibration-absorbing fins 12 but has the same form but is dimensionally fragile or materially fragile and causes the indicator portion 20 to break or deform. But you can.
The scale member 13 and the base plates 10 and 11 may be fixed not by welding but by screws.

DESCRIPTION OF SYMBOLS 1 Foundation 2 Base 3 Anchor bolt 4 Left pillar 5 Right pillar 6 Beam 7 Damping mechanism 8 Damping damper 9a, 9b, 9c, 9d Brace member 10 1st base plate 11 2nd base plate 12 Vibration absorption fin 13, 13a, 13b Scale Member 14 Plate part 15 Contact part 16 Screw hole 17a, 17b Leg part 18 Deformation part 19 Slit 20 Index part 21 Index member 22 Fixing part 23 Sensing part 24 Displacement maintenance member 25 Viscoelastic member 26 Left vibration transmission member 27 Right Vibration transmission member 28 Bolt nut

Claims (2)

  A vibration damping damper having a hysteresis member that is deformed by drawing a hysteresis curve with respect to alternating repeated loads and is fixed between the first and second base plates, wherein the hysteresis member is between the first and second base plates. A damping damper used for a building damping mechanism, wherein a scale member showing a visible change corresponding to the fatigue level set in the hysteresis member is attached under the same alternating repeated load.   The scale member is a steel plate whose both ends are fixed to the first base plate and the second base plate, and the vertical displacement amount of the scale corresponding to the vertical displacement amount of the damping damper is adjusted by the length of the steel plate having fatigue performance. The damping damper for use in a building damping mechanism according to claim 1, wherein the damping damper is used as an indicator portion showing a visible change.

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