JP4908039B2 - Structure for mounting vibration energy absorber of wooden building - Google Patents

Description

  The present invention relates to a structure for attaching to a wooden building an energy absorbing device that suppresses resonance due to earthquake motion and reduces the risk of collapse.

The method of improving the earthquake resistance of existing wooden buildings is generally to reinforce the walls, except for the repair and reinforcement of the foundation. However, the construction work is large and the wall is inherently rigid and not a weak part of the building, so the effect of reinforcing the wall is not necessarily high.
In order to reinforce a portion that is greatly deformed by the earthquake motion, that is, a space portion with few walls, a wall, a pillar, and the like must be newly installed, and the use form of the living space is changed. Therefore, the improvement of earthquake resistance in existing wooden buildings is often limited at present.
On the other hand, attaching an energy absorbing device (buffer: damper) as a vibration control device to a newly built building has already been put into practical use (for example, Patent Document 1 and Patent Document 2). Similar ones can be attached to existing wooden buildings, but many are built under walls and floors, and in this case too, the building must be greatly remodeled.
The vibration energy absorbing device, which is regarded as a vibration damping device, does not convert deformation energy into elastic energy but diverges it as thermal energy, which inhibits the building from acting as an elastic body and consequently resonates with earthquake motion. To prevent this. As such a vibration energy absorbing device (buffer: damper), one using low yield point steel (for example, Patent Document 3), one using high damping rubber (for example, Patent Document 4), hydraulic damper, friction damper (For example, Patent Document 5) is used. It is judged that the reliability of these vibration control effects is high, and if it can be appropriately incorporated into an existing wooden building, it is possible to suppress the resonance of the building and greatly reduce the risk of collapse due to an earthquake.
Patent Publication No. 2004-116161 Patent Publication No. 2005-146574 Patent Publication 2003-278405 Patent Publication 2001-182361 Japanese Patent Publication No. 11-141174

There is a demand for a device that prevents resonance due to earthquake motion of an existing wooden building and reduces the risk of collapse of the building without carrying out large-scale construction such as reinforcement of walls and pillars or new construction.
In order to prevent the resonance of a wooden building, a vibration damping device that has already been put into practical use is attached to the building. Since existing wooden buildings are not designed on the premise of installation of equipment, a structure that properly transmits stress and deformation is required. May cause a new failure caused by an earthquake.
It is an object of the present invention to provide a structure for mounting a vibration energy absorbing device (a shock absorber: a damper), which is a vibration damping device, while minimizing a new load applied to the structure of an existing wooden building. Is.

As a result of diligent research to solve the above-mentioned problems, the present inventor has found that between two pillars via a structure composed of an arm, preferably a movable arm, connected between a pillar and a beam of a wooden building by a rotating shaft. By attaching a vibration energy absorbing device via a bar, preferably a structure consisting of a retractable bar and arm, the vibration due to the earthquake motion of the wooden building is suppressed without giving a new load to the building, and the risk of collapse The inventors have found that the properties can be reduced, and have reached the present invention.
(1) A vibration energy absorbing device is attached between two arms connected by a rotating shaft, and the two arms are respectively attached to beams and columns orthogonal to each other in a wooden building. Structure for attaching vibration energy absorbing device, (2) It is composed of a bar-like bar and two parallel arms connected to both ends of the bar via a rotating shaft, and the vibration energy absorbing device is provided between the bar and each arm. And a structure for mounting a vibration energy absorbing device, wherein the two arms are respectively attached to mutually parallel pillars of a wooden building, (3) a bar-like bar and both ends of the bar, One of the two arms connected via the rotating shaft is mounted with the rotating shaft facing outward, a vibration energy absorbing device is mounted between the two arms, and the other arm parallel to the column is mounted on the column. In (4) The above structure (1), (2) or (4), wherein the arm is held by a slide guide and has mobility and contractibility. The vibration energy absorbing device mounting structure according to 3) and (5) the mounting structure according to the above (1), (2), (3) or (4) are used to attach the vibration energy absorbing device to the building. The present invention relates to a method for reducing the risk of collapse by suppressing resonance due to seismic motion of a wooden building, characterized by being attached to a beam and a column, or two or more columns.

  Some wooden buildings, especially old existing wooden buildings, have a large space with few walls and a large interval between pillars. In such places, the building is greatly deformed by resonating with earthquake motion. A large amount of deformation indicates that the location is a weak point against the earthquake of the building. By attaching a vibration energy absorbing device through the structure of the present invention here, the vibration due to the earthquake motion of the building is suppressed and collapsed without giving a new load to the pillars and beams and their joints which are the basic structure of the building. Can reduce the risk.

The present invention will be described with reference to the drawings.
FIG. 1 is a schematic view of a brace-type vibration energy absorbing device mounting structure A for mounting a vibration energy absorbing device between orthogonal columns and beams of the present invention, where a is a side view and b is an X- It is a cross-sectional schematic diagram in X '. FIG. 2 is a schematic view of the arm of the present invention, in which a is a front view, b is a side view, and c is a cross-sectional view. FIG. 3 is a schematic view of a slide guide that is movable by inserting a mounting arm into a column and a beam, where a is a front view, b is a side view, and c is a cross-sectional view. FIG. 4 is a structural schematic diagram of a movable arm assembled by inserting an arm into a slide guide, where a is a front view, b is a side view, and c is a cross-sectional view at YY ′. FIG. 5 is a schematic view of a beam-type vibration energy absorbing device mounting structure B for mounting the vibration energy absorbing device between two parallel columns.
In the figure, A is a structure for attaching a brace-type vibration energy absorber, B is a structure for attaching a beam-type vibration energy absorber, 1 is an energy absorber (buffer: damper) to which the structure is attached, and 2 is an energy absorber. 3 is a rotating shaft that connects a vibration energy absorbing device (damper: damper) with the arm, and 4 is a column that surrounds the movable arm and transmits the relative inclination of the column and the beam to the arm. Slide guide that enables movement of the arm in the axial direction of the beam, 5 is a rotating shaft that connects the arms, 6 is a screw hole for fixing provided in the arm and the slide guide, and 7 is an arm that is fixed. And a wood screw for fixing the slide guide to the column or beam, 8 is a fixed arm used where the arm does not need to be movable, and 9 is a combination of the movable arm and the fixed arm. Bars configuring the structure of the beam-type Te Align, 10 posts mounting the structure, 11 beams, 12 is a ceiling plate.

Referring to the drawings, FIG. 1 is a schematic diagram of a bracing structure A according to the present invention in which a vibration energy absorbing device is mounted between orthogonal columns and beams. In this example, as shown in FIG. 1, a slide guide is attached to a column 10 and a beam 11 with wood screws 7, and two arms 2 connected by a rotary shaft 5 are inserted into the slide guide to make it movable. Here, since the two arms are connected by the rotating shaft, the tensile stress generated by the energy absorbing device as a fulcrum of the insulator when the angle between the column and the beam is reduced due to the earthquake motion is applied to the rotating shaft. This prevents a tensile stress from being generated at the joint between the column and the beam, which is the above structure. In addition, the arm for attaching the vibration energy absorbing device 1 is not directly fixed to the column 8 and the beam 9, but is movable in the vertical direction of the arm through the slide guide 4, so that the angle between the column and the beam caused by the earthquake motion is reduced. Although the change is transmitted, the rotating shaft 5 serves as a fulcrum of the insulator to suppress the tensile stress generated at the joint between the column and the beam.
2A and 2B are schematic views of the arm 2, which is a basic component, where a is a front view, b is a side view, and c is a cross-sectional view. This arm can be used as a fixed type as it is, or it can be inserted into a slide guide shown in FIG. 3 and used as a movable type. When used as a fixed arm, a screw hole 6 is provided so as to be attached to a pillar or the like with a wood screw.
FIG. 3 is a schematic view of the slide guide 4 of the movable arm, where a is a front view, b is a side view, and c is a cross-sectional view. The slide guide 4 is provided with a screw hole 6 so as to be fixed to the column and the beam with a wood screw.
FIG. 4 is an assembly schematic diagram of the movable arm assembled by inserting the arm 2 into the slide guide 4. The arm 2 is inserted into the slide guide 4 fixed to the column, and in the vertical direction, that is, the column and beam to be mounted. Although it can slide freely in the axial direction, the relative inclination between the column and the beam is transmitted to the vibration energy absorbing device as it is.
FIG. 5 is a schematic diagram of a beam-type structure B in which a vibration energy absorbing device is mounted between two parallel columns. When the beam 11 is not exposed and is hidden behind the ceiling 12 in an existing wooden building, the bar 9 and the column 10 are passed between the two columns by passing a bar 9 having high rigidity instead of the beam. A vibration energy absorbing device similar to the above can be attached between the two.
At this time, if the two columns do not deform in parallel due to the earthquake motion, the bar serves as a fulcrum of the insulator, and tensile stress is generated at the joint portion of the beam connecting the columns. In order to prevent this, a structure similar to that of the movable arm 2 (a structure in which an arm is attached via a slide guide) is attached to one end of the bar 9 so as to be contractible.

Basic principle of the structure of the present invention In a relatively soft ground, the seismic motion has a dominant period of about 1 second, and a wooden building has a natural vibration period of about 1 second. For this reason, wooden buildings tend to resonate with seismic motion, and this is the biggest cause of wooden buildings on soft ground collapsed by earthquakes.
If the resonance of the building can be prevented, the risk of damage or collapse of the wooden structure due to the earthquake can be greatly reduced. For this purpose, it is known that a vibration damping device that absorbs vibration energy may be attached to a building that vibrates as a whole. The vibration energy absorbing device works as a plastic body or a highly viscous fluid against some deformation, and has a property that resists deformation but does not have a restoring force unlike a spring. Numerous vibration control devices for wooden buildings using this have been researched and developed.
Some wooden buildings, especially old existing wooden buildings, are large spaces with few walls and wide column spacing, and such places are greatly deformed when the buildings resonate with earthquake motion. In particular, the deformation becomes large near the ceiling of a building having a heavy tile roof, near the first floor ceiling of a two-story building, and the like. If a vibration energy absorbing device is attached here, resonance can be effectively prevented.
However, since existing wooden buildings are not designed and constructed on the premise that vibration damping devices are installed, it is not necessary to simply install vibration damping devices. The possibility of obstacles by applying a new load must be considered.
On the other hand, in the present invention, as shown in FIG. 1, easy and reliable attachment is possible through a highly rigid arm 2 so that stress is not concentrated on the attachment location of the vibration energy absorbing device for the column and beam. It was made to become.
If a vibration damping device is installed directly between the column and the beam, the vibration damping device acts as a fulcrum of the insulator due to deformation during the earthquake, and tensile stress acts on the joint between the column and the beam. May lead to If the two arms attached to the column and the beam are connected by the rotating shaft 5, the vibration damping device will not be a fulcrum, and the tensile stress generated at the junction between the column and the beam will be greatly reduced.
Furthermore, in the present invention, as shown in FIGS. 1 and 4, the arm 2 for attaching the vibration energy absorbing device 1 is not directly fixed to the column 10 and the beam 11 but includes the slide guide 4. Since the arm can be slid in the vertical direction by mounting (movability), the connecting rotary shaft 5 does not serve as a fulcrum of the insulator, and the generation of tensile stress at the joint between the column and the beam is greatly reduced. Will be.
In order to have such a function, the slide guide 4 has a screw hole 6 for connecting a plate or a beam to which a plate constituting the arm 2 can be inserted, as shown in FIG. As shown in FIG. 4, the movable arm has an arm 2 inserted into a slide guide 4 and has a structure that allows the arm to slide vertically. Moreover, in order to make the movement smooth, a wheel can also be attached to an arm or a slide guide.
Further, as shown in FIG. 5, in existing wooden buildings, the beam 11 is not exposed and is often hidden behind the ceiling plate 12. In such a case, in order to mount the vibration control device between the column 10 and the beam 11, the ceiling plate 12 must be removed to expose the beam 11, which requires a large amount of work. In order to avoid this, in the present invention, a high-strength bar 9 instead of a beam is passed between two parallel columns, and a vibration energy absorbing device similar to the above is attached between the bar and the column. It is something that can be done.
At this time, if the bar 9 is completely fixed to the columns on both sides, the bar becomes a fulcrum of the insulator, and tensile stress may be generated at the joint with the beam as the column is deformed. In contrast, in the present invention, the bar 9 is not directly attached to the column, but the movable arm 2 is attached via the slide guide 4 in the same manner as described above, so that the overall structure is made contractible, This prevents the occurrence of tensile stress at the joint between the column and the beam by preventing the from becoming a fulcrum of the insulator. In this case, if the arm 2 is attached to one end of the bar 9 via the slide guide 4 to make it movable, the entire bar has contractibility and does not become a fulcrum for the deformation of the column. The other arm may be a fixed arm 8 having a simple structure.
In this way, in the present invention, the installation of the vibration energy absorbing device improves the earthquake resistance of the existing building, while the deformation form due to the earthquake of the building is basically not changed, so that at least the building is It was designed so as not to reduce even part of the earthquake resistance that it had.
The vibration energy absorbing device (buffer / damper) 1 to be attached may be any one that can be attached, such as a damper using low yield point steel, a damper using high damping rubber, a hydraulic damper, a friction damper, etc. The mechanism does not matter, but if the reaction force generated by the device against deformation is designed to be sufficiently smaller than the breaking strength of the column and beam to be installed (about one third to one half) Don't be.
There is no restriction on the location in the building, but the effect is great if it is installed in a large space where there are few walls and the interval between columns is wide, that is, where it is expected to shake greatly due to earthquake motion. The effect is higher when there are many places to be attached, but it is necessary to attach several devices to one column and avoid that the total reaction force generated by the device due to deformation due to earthquake motion exceeds the breaking strength of the column.

The material and size of the arm and bar of the structure for mounting the vibration energy absorbing device of the present invention can be selected in consideration of the above, but the size of the column and beam and the vibration energy absorbing device It is necessary to decide in consideration of the size.
For example, the arm 2 is made of aluminum and has a thickness of 3 cm, a width of 7 cm, and a length of 35 cm. The slide guide surrounds the main body of the arm so that the arm can move only in the longitudinal direction, and the material is aluminum or stainless steel and has a length of 28 cm. The bar is made of lightweight steel C-type steel. The width is 4cm, the height is 8cm, and the length is 170cm to 350cm according to the distance between the columns.
In addition, existing wooden buildings have a variety of structures, differ in age and maintenance and repair process, and their seismic performance has a very wide range. On the other hand, the ground of the building is various, and it is difficult to predict the type of earthquake (seismic location, scale, waveform, etc.) that will occur in the future. Therefore, the installation of the vibration energy absorbing device via the structure of the present invention is safe against any earthquake, even if it suppresses the resonance of the building and reduces the risk of collapse of the building. Is not guaranteed.
However, in an actual earthquake damage, not all buildings will collapse, and even if similar buildings are lined up on the same ground, one will collapse and the other will not collapse. Many. This indicates that a slight difference in earthquake resistance affects the safety of the building.
Under such circumstances, it is a fact that most of the existing wooden buildings cannot take the method such as seismic retrofitting with substantial reconstruction immediately due to economic reasons, and the vibration energy absorbing device is simple and low cost. It is considered that the present invention that enables the attachment of a large effect has a great effect of reducing earthquake disasters.
EXAMPLES The present invention will be described below with reference to examples, but it goes without saying that the present invention is not limited to these examples.

  As shown in FIG. 1, a rotating shaft 3 for connecting two arms 6 (thickness 3 cm, width 7 cm, length 35 cm) connected by a rotating shaft 5 which is a structure A for attaching a brace-type vibration energy absorbing device. The vibration energy absorbing device 1 is attached to the brace type and the slide guide 4 (length 28 cm) into which the arm is inserted is fixed to the column 10 (10 cm × 10 cm) and the beam 11 (10 cm × 12 cm), The energy absorbing device 1 was attached between the column and the beam using the bracing type vibration energy absorbing device mounting structure.

  As shown in FIG. 5, a fixed arm 8 (thickness 3 cm, width 7 cm, length) is attached to one end of a bar 9 (width 4 cm, height 8 cm, length 260 cm) using lightweight steel C-shaped steel. 35cm), and a movable arm with the arm 2 inserted into the slide guide 4 (length 28cm) at the other end is attached as a whole with a contractibility. The beam-type vibration energy absorbing device mounting structure B is formed by mounting the fixed arm 8. The bar of this structure is passed between two parallel pillars 10 (each 10 cm × 10 cm), the arm is fixed to the pillar, and the bar is attached, and the bar is straddled between the pillar and the bar via the arm. The vibration energy absorbing device 1 was attached in two places.

  By installing the vibration energy absorbing device through the structure of the present invention in a place where there are few walls of wooden construction, especially existing wooden construction, and the space between pillars is wide, there is an adverse effect on the original structure. The resonance of the building due to seismic motion can be suppressed while keeping the minimum, and the risk of collapse of the building can be reduced. The present invention is useful for earthquake disaster prevention of wooden buildings.

FIG. 3 is a schematic view of a bracing structure A in which a vibration energy absorbing device is mounted between orthogonal columns and beams of the present invention, where a is a schematic side view, and b is a schematic cross-sectional view at XX ′. BRIEF DESCRIPTION OF THE DRAWINGS It is a schematic diagram of the arm which is a fundamental component of this invention, a is a front view, b is a side view, c is sectional drawing. It is a schematic diagram of the slide guide attached to a pillar and a beam, and making it movable by inserting an arm, a is a front view, b is a side view, and c is a sectional view. It is a structure schematic diagram of the movable arm assembled by inserting the arm into the slide guide, a is a front view, b is a side view, and c is a cross-sectional view at YY ′. It is a schematic diagram of the beam-shaped structure B which attaches a vibration energy absorption apparatus between two parallel pillars of this invention.

Explanation of symbols

A, Brace-type vibration energy absorption device mounting structure B, beam-type vibration energy absorption device mounting structure 1, energy absorption device attached to the structure (buffer: damper)
2. Arm 3 connecting the energy absorbing device, rotating shaft 4 connecting the vibration energy absorbing device (damper: damper) with the arm, surrounding the arm, slide guide 5 enabling its vertical movement, and connecting the arms together Rotating shaft 6, screw hole 7 for fixing the arm and slide guide to the column and beam, wood screw 8 for fixing the arm and slide guide to the column and beam, and a fixed arm used where the arm does not need to be movable 9. Bar 10 constituting a beam-type structure in combination with an arm, pillar 11 for mounting the structure, beam 12, ceiling plate

Claims (3)

It consists of a bar-shaped bar and two parallel arms connected to both ends of the bar via rotating shafts. A vibration energy absorbing device is attached between the bar and each arm, and each of the two arms is made of wooden construction. A structure for attaching a vibration energy absorbing device, wherein the structure is attached to columns parallel to each other. Arm is held in slide guides, mobility and consists to have compressible property claim 1 Symbol placement vibration energy absorbing device mounting structure. A vibration energy absorbing device is attached to two or more pillars of a building using the mounting structure according to claim 1 or 2, and a method for suppressing a collapse by suppressing a resonance due to an earthquake motion of a wooden building. .

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