JP2008063914A - Seismic response control frame - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a seismic response control frame having rigidity to horizontal force of a structure, and easy and inexpensive in construction, by restraining stress displacement of the structure, by efficiently dispersing stress, by efficiently absorbing seismic force. <P>SOLUTION: This seismic response control frame is installed in a substantially rectangular opening part formed in a wooden framework formed of a column 8 being a structural member and a horizontal member 9 such as a beam, and has a lightweight steel frame substantially rectangular frame 2 fixed along the inner periphery of the opening part and two brace dampers 3 and 3 installed in a substantially V shape to be adjusted to the inside of the frame 2. The brace dampers 3 are installed in the fame 2 so that the axis 35 of the brace dampers 3 becomes line symmetry to the virtual axis 23 of vertically equally dividing the frame 2, by crossing an intersection 11 between the axis 8a of the column 8 and the horizontal member 9 such as a sill 7 and the beam. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a vibration control frame that is attached to an opening surrounded by a pillar, which is a structural member, and a horizontal member such as a beam.

Wooden houses play a major role in Japanese housing production. Among them, the wooden frame construction method is a method that has been passed down in Japan for a long time, and many wooden houses are based on the wooden frame construction method.
As shown in FIG. 13, the wooden frame construction method is a structure in which a base 8 made of reinforced concrete or the like is connected to a timber 7 and a pillar 8, a pillar 8 and a pillar that are vertically erected on the base 7. 8 is a method of constructing a substantially rectangular frame with a horizontal member 9 such as a beam which is a horizontal member connecting between the two. The wooden frame construction method has few structural restrictions, and it is possible to realize a wide open house by taking a large opening 10 surrounded by pillars 8, horizontal members 9 such as beams, bases 7, etc. is there.
However, a house made of a wooden frame construction method has a problem that rigidity against a horizontal force is weak. In particular, when an earthquake occurs, a strong horizontal force acts on the house. As a result, a horizontal force acts on the column 8 and the horizontal member 9 such as a beam, and a joint that is a corner joint between the column 8 and the horizontal member 9, and the column 8 can no longer resist the earthquake force. However, it has been a problem that it may fall off the base 7 and cause the house to collapse.
Inventions for solving this problem have been proposed so far. For example, there are techniques described in Patent Document 1 and Patent Document 2.

The joint damper of the wooden frame structure proposed by Patent Document 1 uses a hard plate such as two or more triangular copper plates, and a viscoelastic body or viscoelasticity between the adjacent hard plates. By attaching a damper sandwiching an energy absorbing material having characteristics to a joint in a wooden frame structure, reinforcement of a joint portion and improvement of earthquake resistance of a structure such as a house are intended. However, in the present invention, when a horizontal force acts on the house and a stress displacement occurs, there is a problem that the joint damper gets stuck in a horizontal member such as a column or a beam and damages the house.
In addition, the vibration control frame proposed by Patent Document 2 is obtained by incorporating an oil damper, which is a vibration control device, and a brace, which is a vibration-resistant element, in the same frame. However, in the present invention, since the seismic control device and the seismic element are separately incorporated, the construction of the seismic control frame becomes complicated. In addition, there is a problem that the price is increased by incorporating the oil damper.
JP 2003-247269 A JP 2001-90377 A

  Therefore, in the present invention, by effectively absorbing the seismic force and efficiently distributing the stress, the stress displacement of the structure is suppressed, the structure has rigidity against the horizontal force, and the construction is easy. The purpose is to provide an inexpensive seismic control frame.

  The problem to be solved by the present invention is as described above. Next, means for solving the problem will be described.

  In other words, in claim 1, a light-damping frame attached to a substantially rectangular opening formed in a wooden frame made of a wooden structural member, which is a light weight fixed along the inner periphery of the opening. It is provided with a steel frame and one or a plurality of brace dampers built on the frame.

  In Claim 2, it is the damping frame attached to the substantially rectangular opening part formed in the wooden frame which consists of a wooden structural member, Comprising: The lightweight steel frame fixed along the inner periphery of the said opening part And two brace dampers installed in the frame in a substantially square shape.

  According to a third aspect of the present invention, the brace damper is disposed so that an extension line of the central axis of the brace damper passes through the intersection of the structural members.

  As effects of the present invention, the following effects can be obtained.

  In Claim 1, it is the vibration control frame attached to the substantially rectangular opening formed in the wooden frame which consists of a wooden structural member, Comprising: The lightweight steel frame fixedly provided along the inner periphery of the said opening And the brace damper installed on the frame, the rigidity of the structure against the horizontal force is improved, and the vibration control frame can be formed easily and inexpensively. Become.

  In Claim 2, it is the damping frame attached to the substantially rectangular opening part formed in the wooden frame which consists of a wooden structural member, Comprising: The lightweight steel frame fixed along the inner periphery of the said opening part And the two brace dampers installed in the frame together in a substantially square shape can efficiently absorb the force of the earthquake.

  According to the third aspect of the present invention, the brace damper is arranged so that the extension line of the central axis of the brace damper passes through the intersection of the structural members, so that it is possible to efficiently absorb the earthquake force. .

Next, embodiments of the invention will be described.
1 is a diagram illustrating the structure of the vibration control frame 1, FIG. 2 is a diagram illustrating the structure of the frame 2, FIG. 3 is a diagram illustrating the structure of the brace damper 3, and FIG. 4 is a diagram illustrating the structure of the brace damper 3 relative to the frame 2. FIG. 5 is a view for explaining the attachment of the gusset plate 4 and the brace damper 3 to the frame 2, FIG. 6 is a view for explaining the structure of the gusset plate 4, FIG. FIG. 8 is a diagram illustrating the attachment of the brace damper 3b to the frame 2, FIG. 8 is a diagram illustrating the attachment of the gusset plate 52 to the frame 2, and FIG. 9 is a diagram illustrating another embodiment of the vibration control frame 1. FIG. 10 is a view for explaining how the vibration control frame 1 is attached to the opening 10, and FIGS. 11 and 12 are views showing the stress distribution state of the vibration control frame 1. FIG. Is a diagram for explaining a wooden framework construction method.

The vibration control frame 1 according to the embodiment of the present invention is attached to a substantially rectangular opening 10 formed in a wooden frame made of a wooden structural member (a pillar 8 or a horizontal member 9 such as a beam). This is to provide the wooden frame with a vibration control function.
As shown in FIG. 1, the seismic control frame 1 includes a substantially rectangular frame 2 made of a lightweight steel frame fixed along the inner periphery of the opening 10, and one or a plurality of braces installed on the frame 2. It is provided with dampers 3. The brace damper 3 is attached to the frame 2 via a gusset plate 4.

  Next, the structure of the frame 2 and the brace damper 3 and the structure for attaching the brace damper 3 to the frame 2 will be described in detail.

First, the structure of the frame 2 will be described with reference to FIG.
The frame 2 is formed by assembling a lightweight steel frame (C-shaped steel) with an open cross-section C shape into a substantially rectangular shape with the C-shaped open surface on the inner peripheral side, and welding the joints at the four corners. The frame 2 is disposed in the substantially rectangular opening 10 defined by the pillars 8 and the beams, and the frame 2 is attached along the inner periphery of the opening 10. Is adjusted to the length of the pillar 8 in contact with the opening 10, the horizontal member 9 such as a beam, and the base 7. Since the frame 2 is attached to the opening 10, attachment holes 22 are provided at substantially equal intervals on the outer peripheral surface of the frame 2 that contacts the pillar 8 when the frame 2 is attached to the opening 10. Note that the shape of the frame 2 is not limited to an open-section C-type lightweight steel frame, and includes an open-section L-type, an open-section groove-type, and the like. Moreover, the joining part of lightweight steel frames may not only be welded but also bolted.

The material of the frame 2 is preferably a lightweight steel frame.
The lightweight steel frame is a steel frame formed by forming a thin steel plate having a thickness of 6 mm or less into a groove shape, a C shape (lip groove shape), a Z shape, or a mountain shape.
By using a lightweight steel frame, it becomes possible to improve the strength of the house compared to the case of using aluminum or stainless steel, and the burden on the ground is reduced compared to the case of using a heavy steel frame, and It is possible to form a frame at a low cost in processing and construction.

Next, the structure of the brace damper 3 will be described with reference to FIG.
In the present invention, it is desirable to employ a viscoelastic brace damper for the brace damper 3. The viscoelastic brace damper is formed by inserting a laminated body of a viscoelastic body 31 and an inner steel plate 36 into an outer steel plate 32 that is an end-closed cylindrical body. A connection plate 33 is fixed to the closed end of the outer steel plate 32, while a connection plate 33 is fixed to the non-insertion end of the inner steel plate 36. Bolt joint holes 34 are formed in these connection plates 33.
In the viscoelastic brace damper 3 having the above-described configuration, when a tensile force or a compressive force is generated in the axial direction, the viscoelastic body 31 interposed between the inner steel plate 36 and the outer steel plate 32 is deformed by friction, and energy is supplied. Absorb.

There are various types of dampers such as steel dampers, friction dampers, oil dampers, viscoelastic dampers, etc.In particular, oil dampers and viscoelastic dampers are suitable for small to large earthquakes. It is possible to effectively maintain the functionality inside the house after the earthquake.
Also, comparing the same speed proportional damping oil damper and viscoelastic damper, the oil damper has the problem of high price, whereas one viscoelastic damper is similar to the oil damper It has the advantage that it can provide a relatively inexpensive damper while having damping performance.
Furthermore, by using a brace-type damper, the attachment to the substantially rectangular opening 10 constituted by the column 8 and the horizontal member 9 is facilitated.
From the above, in the present invention for the purpose of damping a wooden house, it is desirable to employ a viscoelastic brace damper for the damping frame 1 in terms of performance, price, and construction.

Next, a structure for attaching the brace damper 3 to the frame 2 will be described with reference to FIGS. 4, 5, 6, 7, and 8.
In this example, the brace damper 3 is attached to the frame 2 by bolting both ends of the brace damper 3 to the gusset plates 4 and 52 welded to the frame 2.

As shown in FIG. 4, the two brace dampers 3, 3 are arranged so as to be symmetric with respect to a virtual axis 23 that equally divides the frame 2 up and down, and the two brace dampers 3, 3 are arranged. Is in the shape of a letter. That is, the vibration control frame 1 is a vibration control frame having a K-type brace, and a brace damper is provided as the brace.
Further, according to the present invention, when the vibration control frame 1 is attached to the opening 10 of the structure, the extension line of the central axis 3a of the brace damper 3 is connected to the central axis 8a of the column 8 and the side of the base 7 or the beam. In this structure, the brace damper 3 is attached to the frame 2 so as to cross the intersection 11 with the frame 9.

To attach the brace damper 3 to the K-type, either one end of each of the brace dampers 3 and 3 is bolted to the frame 2 via a substantially inverted gusset plate 4 welded to the frame 2. To do.
At this time, as shown in FIG. 4, the brace damper 3 is arranged line-symmetrically with respect to a virtual axis line 23 that equally divides the frame 2 up and down. For this purpose, the gusset plate 4 must be attached so that the virtual axis 23 overlaps with the substantially vertical center axis 4b of the gusset plate 4 as shown in FIG.
As a method of attaching the gusset plate 4 to the frame 2, there are a method of welding the gusset plate 4 to the frame 2, a method of bolting the gusset plate 4 to the frame 2, and the like. That is, there is no limitation on the method of attaching the gusset plate 4 to the frame 2.

As shown in FIGS. 4 and 5, the shape of the gusset plate 4 is substantially inverted, and joins both the brace dampers 3 and 3. However, a strong load is applied to the gusset plate 4 by joining both the brace dampers 3 and 3. Therefore, as shown in FIG. 6, the reinforcing plate 4a is welded to both surfaces of the gusset plate 4, and the gusset plate 4 is reinforced by the reinforcing plate 4a, thereby ensuring the rigidity against the load.
In addition, the shape of the gusset plate 4 is not limited to the shape shown in FIGS. The shape of the gusset plate 4 includes a square shape and a trapezoidal shape.

When the damping frame 1 is attached to the opening 10 of the structure, the extension line of the central axis 35 of the brace damper 3 is the intersection of the central axis 8a of the column 8 and the horizontal member 9 such as the base 7 or the beam. To cross 11, as shown in FIG. 7, when the brace damper 3 b is bolted to the gusset plate 52, the central axis 35 of the brace damper 3 b passes through the center of the bolt 12. That is, as shown in FIG. 8, the central axis 35 of the brace damper 3 b passes through the central point of the bolt joint hole 53 formed in the gusset plate 52.
Therefore, in order to attach the brace damper 3 to the frame so that the central axis 35 of the brace damper 3 intersects the intersection 11 of the central axis 8a of the column 8 and the horizontal member 9 such as the base 7 or the beam, As shown in FIG. 8, a bolt joint hole 53 is formed so that the central axis 35 of the brace damper 3b passes through the center of the bolt joint hole 53, and the center of the bolt joint hole 53 and the center The gusset plates 51 and 52 must be attached to the frame 2 so that the shaft 35 overlaps.
As a method of attaching the gusset plates 51 and 52 to the frame 2, there are a method of welding the gusset plates 51 and 52 to the frame 2, a method of bolting the gusset plates 51 and 52 to the frame 2, and the like. That is, there is no limitation on the method of attaching the gusset plates 51 and 52 to the frame 2.
In this invention, the brace damper 3 is attached to the frame in a substantially square shape, so that the gusset plate 51 and the gusset are shown in FIG. The plate 52 is attached to the vicinity of the joint on the side where the gusset plate 4 is not attached, out of the pair of frame sides in contact with the column 8.
The shapes of the gusset plate 51 and the gusset plate 52 are not limited to the shapes shown in FIGS. The shapes of the gusset plate 51 and the gusset plate 52 include shapes such as a square shape and a trapezoidal shape.

Although it is the detail of attachment to the flame | frame 2 of the brace damper 3, either one of the connection plates 33 and the gusset plate 4 are bolted together, and the remaining one of the connection plates 33 is connected to the gusset plate 51 or the gusset plate. By attaching the bolts 52 to 52, the attachment of the brace damper 3 to the frame 2 is completed.
In addition, the bolt joint may be a normal bolt joint, but a high-strength bolt joint or a tensile bolt joint is suitable for the present invention because a stronger joint is possible.

The shape of the vibration control frame 1 is not limited to the shape shown in FIG.
As shown in FIG. 9, a middle belt frame 24 is attached at a position where the frame 1 is equally divided up and down, and the brace dampers 3 and 3 with respect to the frame 2 so as to be symmetrical with respect to the middle belt frame 24. It is also possible to attach to the shape of a letter.

As shown in FIG. 10, the seismic control frame 1 formed in this way is for attaching a seismic control structure to the structure by attaching it to the opening 10 of the structure.
Since the mounting holes 22 are provided at substantially equal intervals on the outer peripheral surface of the frame 2 in contact with the pillar 8, the vibration control frame 1 is fitted into the opening 10 as shown in FIG. By attaching the vibration control frame 1 to the column 8 with bolts 13 through bolts, the attachment of the vibration control frame 1 to the opening 10 is completed.
In this way, since it is only necessary to bolt the damping frame 1 to the column 8, the damping structure can be formed by simple construction.

Next, the state of stress distribution of the vibration control frame 1 when the vibration control frame 1 formed as in the present invention is attached to the opening 10 and then an earthquake occurs will be described with reference to FIGS. Note that arrows in the X and Y directions shown in the figure indicate the direction of horizontal force acting on the structure when an earthquake occurs.
First, as shown in FIG. 11, when a horizontal force from the X direction is applied, a tensile force is generated in the brace damper 3b and a compressive force is generated in the brace damper 3a. As shown in FIG. 12, when a horizontal force from the Y direction is applied, a tensile force is generated in the brace damper 3a and a compressive force is generated in the brace damper 3b.
By these tensile force and compressive force, the viscoelastic body constituting the brace damper is deformed and absorbs vibration energy.
In the present invention, when the vibration control frame 1 is attached to the opening 10 of the structure, the center axis 8a of the column 8 and the horizontal member such as the base 7 and the beam are arranged on the extension line of the center axis 3a of the brace damper 3. This is a configuration in which an intersection 11 with 9 exists. Therefore, the horizontal force can be efficiently absorbed by the brace damper 3 from the intersection 11 where the load of the horizontal force is strongly applied.
The brace damper 3 is symmetrical with respect to a virtual axis 23 that equally divides the frame 2 up and down, and is attached to the K-shape, so that the tensile force generated in each of the brace dampers 3 and 3 arranged up and down is provided. And the compression force can be kept in balance. That is, even if a horizontal force is applied from either the X direction or the Y direction, it is possible to evenly reduce the load applied to the column 8 and the like.

Furthermore, the present invention uses a vibration control frame 1 in which a brace damper 3 is mounted in a substantially rectangular frame 2, and a structure in which stress generated in the vibration control frame 1 due to an earthquake is distributed throughout the vibration control frame 1. Have taken.
In this way, the stress is distributed throughout the seismic control frame 1, so that a load is not applied to a part of the joint portion or the like as in the prior art, and the post is made evenly throughout the seismic control frame 1. It is possible to support the horizontal member 9 such as 8 or a beam, and to reduce the burden on the horizontal member 9 such as the column 8 or the beam. As a result, it is possible to improve the rigidity of the structure against a horizontal force. It becomes possible.

In this way, the horizontal force is efficiently absorbed by the brace damper 3, the burden on the pillar 8 and the like is reduced, and it is possible to resist the horizontal force against the horizontal force as a whole. The rigidity of the structure is improved, and the stress displacement of the structure can be suppressed. Further, since the stress is evenly distributed throughout the vibration control frame 1, there is no burden on a part of the vibration control frame 1, and a part of the vibration control frame 1 is a horizontal member 9 such as a column 8 or a beam. It is possible to prevent stagnation and damage to the pillar 8 and the horizontal member 9.
As a result, it is possible to prevent the pillar 8 from falling off the base 7, and it is possible to avoid damaging or collapsing the house even if an earthquake occurs.

Further, the vibration control frame 1 can easily change the mounting position and the mounting angle of the brace damper 3 by changing the mounting positions of the gusset plate 51 and the gusset plate 52. Therefore, depending on the thickness of the pillar 8 and the distance between the pillars 8 and 8, the central axis 35 of the brace damper 3 is the intersection 11 between the central axis 8a of the pillar 8 and the horizontal member 9 such as the base 7 or the beam. It is possible to change the mounting position of the brace damper 3 so as to cross each other and absorb the horizontal force acting on the structure most efficiently according to the layout of each house.
In other words, it is possible to create a free floor plan with excellent rigidity against horizontal force.

In addition, this invention is not applied only to the house which consists of a wooden frame construction method. Also in the wooden frame wall construction method, it is possible to improve the rigidity against the horizontal force by attaching the vibration control frame 1 according to the present invention to the frame.
The present invention is effective not only for strong shaking caused by an earthquake, but also for small shaking caused by wind or the like. Therefore, it is possible to effectively reduce not only large-amplitude shaking that affects structural safety in the event of a large earthquake, but also large and small shaking that occurs in a house.

The figure explaining the structure of the damping frame 1. FIG. The figure explaining the structure of the flame | frame 2. FIG. The figure explaining the structure of the brace damper 3. FIG. The figure explaining attachment of the brace damper 3 with respect to the flame | frame 2. FIG. The figure explaining attachment with respect to the flame | frame 2 with the gusset plate 4 and the brace damper 3. FIG. The figure explaining the structure of the gusset plate 4. FIG. The figure explaining attachment with respect to the flame | frame 2 with the gusset plate 52 and the brace damper 3b. The figure explaining attachment with respect to the flame | frame 2 of the gusset plate 52. FIG. The figure which shows the Example of another form of the damping frame 1. FIG. The figure explaining the attachment with respect to the opening part 10 of the damping frame 1. FIG. The figure which shows the state of the stress dispersion | distribution of the damping frame. The figure which shows the state of the stress dispersion | distribution of the damping frame. The figure explaining a wooden frame construction method.

Explanation of symbols

1 Seismic control frame 2 Frame 3 Brace damper 4, 51, 52 Gusset plate 6 Basics
7 foundation 8 pillars
9 Horizontal member 10 Opening
11 Intersection
12, 13 volts

Claims (3)

  A light-damping frame attached to a substantially rectangular opening formed in a wooden frame made of a wooden structural member, the frame made of a lightweight steel frame fixed along the inner periphery of the opening, and the frame A seismic control frame comprising one or more brace dampers erected on the frame.   A light-damping frame attached to a substantially rectangular opening formed in a wooden frame made of a wooden structural member, the frame made of a lightweight steel frame fixed along the inner periphery of the opening, and the frame A seismic control frame comprising two brace dampers erected in a substantially square shape. The seismic control frame according to claim 1 or 2, wherein the brace damper is arranged so that an extension line of a central axis of the brace damper passes through an intersection of the structural members.

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