JP2001081880A - Vibration control structure of intermediate or low building and its application method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent application of an excessive force to a periphery of a predetermined rectangular part by providing the rectangular part for a steel skeleton, and providing this rectangular part with a surface joint portion that keeps a rigid contact when a force in a traffic vibration range is applied and becomes into a movable state when a force larger than this force acts thereon. SOLUTION: A solid lubricating treatment is applied to movable treating portions 3d on both surfaces of a plate portion 3b of a gusset plate 3 as a surface joint portion of a rectangular part A and a movable treating portion 5b on one surface of a movable spacer 5, and a fastening torque of a high pressure bolt 7 is defined to set a proof stress of the movable treating portions 3d and the movable treating portion 5b to about 100 kgf. On the surface joint portion of the rectangular part A, a movable frictional force in transition of this rectangular part A to the movable state is set to about 500 kgf. Thus, the frictional force on the surface joint portion of the rectangular part A keeps the rigid contact for a micro vibration such as a traffic vibration, and the rectangular part A transmits to the movable state when a force stronger than a traffic vibration range acts by an earthquake or the like to provide a flexible structure that does not load the proof stress.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vibration damping structure for traffic vibrations of a low-rise building and a construction method thereof.

[0002]

2. Description of the Related Art In low-rise buildings such as houses and offices, for example, continuous vibration caused by vehicles running around low-rise buildings or construction work performed around low-rise buildings or continuous walking in houses. Frequency of small vibrations
Micro-vibration (hereinafter referred to as "traffic vibration"), which has a relatively short period of about 5 Hz and a small force acting on the building, often poses a problem.

That is, in a high-rise building such as a high-rise building, the natural frequency of the building itself is designed to be about 0.3 to 2 Hz, so that the resonance does not overlap with the frequency band of traffic vibration (about 2 to 5 Hz). However, in a low-rise building such as a house or office, the natural frequency of the building itself is designed to be about 3 to 4 Hz, so that it resonates with the traffic vibration frequency (about 2 to 5 Hz) band. Sometimes.

[0004] As means for suppressing the vibration of the middle and low-rise building due to traffic vibration, a natural beam of the middle and low-rise building is increased by fixing a stick to the steel frame of the middle and low-rise building to increase the rigidity of the middle and low-rise building. Can be raised from the frequency of the traffic vibration to deviate from the frequency band of the traffic vibration (about 2 to 5 Hz) to avoid the resonance phenomenon.

[0005]

However, in the above-mentioned conventional example, since a large rigidity is given to the portion where the brace is fixed in the steel frame of the middle- and low-rise building, a force larger than the traffic vibration due to an earthquake or the like ( For example, when an earthquake with a seismic intensity exceeding 3 causes a force of several hundred kgf or more to act on a low-rise building, an excessive force is applied to the brace, which may adversely affect the behavior of the low-rise building.

In particular, since a large-scale earthquake may lead to the destruction of the middle and low-rise building, it is necessary to consider the installation position of the brace in advance in the structural calculation of the middle and low-rise building.

On the other hand, as disclosed in Japanese Patent Application Laid-Open No. 9-268802, there are many conventional examples in which a friction damper is provided on a part of a frame such as a brace as a vibration damping device against an earthquake. But,
All of these technologies are designed to absorb high-resistance, that is, a high friction coefficient when a seismic force exceeding a certain level is applied, and to absorb vibration energy. Even so, it is a so-called damper that still functions as a part of the frame.

That is, when these technologies are applied to a low-rise building such as a house or an office, rigidity is increased with respect to minute vibration such as traffic vibration, and the natural frequency of the low-rise building is high. Although it exerts a vibration damping effect, when an earthquake or the like occurs, if it is a damper, if it is arranged lean to the building, there is a possibility that it will adversely affect the middle and low-rise buildings.

The present invention has been made to solve the above problems, and
The purpose is to provide a joint on the steel frame of a low-rise building with a surface joint. It functions as a contact, increases the rigidity of the low-rise building, exerts a vibration damping effect, and when a force greater than the traffic vibration due to an earthquake etc. acts on the low-rise building, the surface joint of the brace becomes movable It is an object of the present invention to provide a vibration control structure for a medium-to-low-rise building in which no excessive force is applied to a peripheral portion of the brace and a construction method thereof.

[0010]

According to the present invention, there is provided a vibration damping structure for a middle-to-low-rise building according to the present invention, in which a steel skeleton of the middle-to-low-rise building is provided with a brace for increasing the rigidity of the middle-to-low-rise building. The brace is characterized in that it has a surface joint that is kept movable when a force in the traffic vibration range acts, and is movable when a force greater than the force in the traffic vibration range acts. .

[0011] According to the above structure, since the brace provided on the steel frame of the middle- and low-rise building has a surface joint, a small force caused by minute vibration of the middle- and low-rise building due to traffic vibration exerts a small force on the brace. When the surface joint functions as a rigid connection, it increases the rigidity of the middle and low-rise building and exerts a vibration damping effect, and when a force greater than traffic vibration due to an earthquake etc. acts on the middle and low-rise building,
No excessive force is applied to the peripheral portion of the stick because the surface joint of the stick is movable.

Further, since the coefficient of kinetic friction is set to be extremely low when the surface joint of the brace is movable, the brace absorbs a force and damps like the above-mentioned conventional damper. It does not exist as a part, but it is easy to follow the seismic vibration at least in the peripheral part of the brace, because the brace transitions to the state where the brace is removed from the steel frame by the movable action of the surface joint After convergence, the state returns to the original state.

Further, the method of constructing a vibration damping structure for a middle-to-low-rise building according to the present invention is characterized in that the above-mentioned brace is prepared in advance, and the brace is fixed to a steel frame of the middle-to-low-rise building.

According to the above construction, the workability at the work site is improved by presetting the frictional force at which the surface joint of the brace starts to move at the factory or the like.

[0015]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a block diagram showing an embodiment of a vibration damping structure for a medium-to-low-rise building and a method for constructing the same according to the present invention. FIG. 1 is a perspective view showing the configuration of a steel frame of a low-rise building equipped with a vibration damping structure for a low-rise building according to the present invention.
1 is a front view showing the configuration of the first floor of a steel frame of a low-rise building equipped with the first embodiment of the vibration control structure of a low-rise building according to the present invention, and FIG. FIG. 4 is an explanatory front view showing the structure of a gusset plate serving as a connecting member of a staff used in the first embodiment of the structure. FIG. 4 shows a gusset plate and a staff member serving as a connecting member of the staff in the first embodiment. FIG. 5 is a cross-sectional explanatory view showing a state in which a grooved steel is joined to a grooved steel by a surface joint. FIG. Sectional explanatory view showing the situation, FIG.
FIG. 7 is a diagram illustrating a configuration of a movable spacer interposed in a surface joint of a brace in the first embodiment, and FIG. 7 is a diagram illustrating a stress distribution acting on a steel frame of a middle and low-rise building due to shaking.

First, a first embodiment of a vibration damping structure for a low-rise building and a construction method thereof according to the present invention will be described with reference to FIGS. 1 and 2, reference numerals 1 and 2 denote columns and beams constituting a steel frame of a low-rise building such as a house or an office. In the present embodiment, the columns 1 are formed of square pipes, and the beams 2 are H-shaped steel. It consists of.

As shown in FIGS. 1 and 2, at the corner where the pillar 1 and the beam 2 on the first floor are joined, a brace A for increasing the rigidity of the low-rise building is fixed. As shown in FIGS. 3 to 5, the staff A has two gusset plates 3 each having a T-shaped cross section serving as a connecting member and a trapezoidal side surface, and 2 serving as a staff.
The two channel steels 4 are joined back to back.

The gusset plate 3 has a flange 3a which is joined to the column 1 or the beam 2 and is joined to the plate portion 3b which is joined to the channel steel 4 at right angles by welding. A reinforcing plate 3c is welded to the portion 3b.

The gusset plates 3 fixed to the column 1 side and the beam 2 side are respectively connected by bolts in a state where a pair of channel steels 4 are backed to each other. As shown in FIG. 4, it is fixed to the steel 4 with a movable spacer 5 interposed therebetween.

A movable processing portion 3d forming a surface joint is formed with a predetermined area at a portion where the channel steel 4 is joined on both surfaces of the plate portion 3b of the gusset plate 3 fixed to the beam 2 side. A stick A is provided at a substantially central portion of the movable processing portion 3d.
A long hole 3e is formed along the direction in which is arranged.

The movable processing portion 3d is formed by solid lubrication on both surfaces of the plate portion 3b with a movable processing material or the like and has a predetermined coefficient of friction. The movable processing portion 3d moves along the elongated hole 3e. 5 has a predetermined area including a movable range 6 indicated by a broken line in FIG.

On the flange 3a of the gusset plate 3,
A bolt hole 3f is formed, and FIG.
The gusset plate 3 is fixed to the column 1 and the beam 2 by inserting a bolt and bolting to the column 1 and the beam 2 as shown in FIG. You can do it.

As shown in FIG. 6, the movable spacer 5 is formed in a disk shape having a bolt hole 5a at the center, and has a predetermined friction coefficient by solid lubrication on one surface of the movable spacer 5 with a movable processing material or the like. A movable processing unit 5b is formed.

Since the gusset A is fixed by bolting the gusset plates 3 attached to both ends thereof to the pillars 1 and the beams 2 serving as the steel frame of the low-rise building, the construction of the low-rise building is carried out. Sometimes it can be handled as a single part and can be mass-produced in a factory or the like in advance.

When assembling the cane A, for example, as shown in FIG.
5 through the bolt hole 4a formed in the channel steel 4 from the groove side (left side in FIG. 5), and then into the bolt hole 5a of the movable spacer 5 from the side of one of the movable spacers 5 where solid lubrication is not performed. Then, it is inserted through the elongated hole 3e formed in the plate portion 3b of the gusset plate 3, then is inserted through the solid lubrication-treated side of the other movable spacer 5 into the bolt hole 5a of the movable spacer 5, and then On the other side (back side) of the other channel 4
After that, the nut 9 and the lock nut 10 for locking are sequentially screwed into the high-strength bolt 7 via the flat washer 8 and tightened with a predetermined tightening torque after passing through the bolt hole 4 a formed in the channel steel 4. Put on and fix.

Here, the acceleration of the vibration of the middle and low-rise building which shakes due to continuous minute vibration such as traffic vibration is 0.5 to 3 cm / s.
If it is ec ² , one of the low-rise buildings shown in Figs. 1 and 2
The displacement of the steel frame in the vicinity of the brace A provided at the corner of the upper floor is about 0.1 mm at the maximum. When the rigidity of the staff A is about 3 t / cm, the axial force applied to the staff A due to the swing becomes 30 kgf.

FIGS. 1 and 2 show a case where the acceleration of the vibration of the middle and low-rise building is 50 cm / sec ² which is shaken by the vibration of the seismic intensity of about 3 where a force larger than the force in the traffic vibration range acts. The maximum displacement of the steel frame in the vicinity of the brace A provided at the upper corner of the first floor of the middle and low-rise building is about 1.5 mm. If the rigidity of the staff A is also about 3 t / cm, the axial force applied to the staff A by the above-mentioned shaking is 600 kg.
becomes f.

Therefore, the solid lubrication process is performed on the movable processing portions 3d on both surfaces of the plate portion 3b of the gusset plate 3 serving as the surface joining portion of the brace A and the movable processing portion 5b on one surface of the movable spacer 5. , High-strength bolt 7 with torque wrench, etc.
Is set to about 105 kgf · cm, and the proof stress between the movable processing part 3 d of the plate part 3 b of the gusset plate 3 and the movable processing part 5 b of the movable spacer 5 is set to about 100 kgf. In this example, the movable frictional force at which the staff A transitions to the movable state is set to about 500 kgf.

As a result, the movable friction force 500 kgf at which the staff A transitions to the movable state is greater than the axial force 30 kgf applied to the staff A during minute vibration such as traffic vibration, and the axial force 600 kgf applied to the staff A during an earthquake. Therefore, against micro-vibration such as traffic vibration, the frictional force at the surface joint of the brace A maintains rigid contact and bears the proof stress, and a force greater than the force in the range of traffic vibration due to earthquake etc. acts. In this case, since the transition is made to the movable state at the surface joining portion of the brace A and the proof strength is not borne, the low-rise building structure becomes a flexible structure and does not adversely affect the low-rise building structure.

Then, the assembly is made in a factory or the like in such a manner that a predetermined movable frictional force is exerted between the movable spacer 5 and the plate portion 3b of the gusset plate 3 which is to be a surface joint of the brace A. The cane A is carried into the construction site of the middle and low-rise building, and the gusset plates 3 attached to the both ends of the cane A are hung over the pillars 1 and the beams 2 serving as the steel frame of the middle and low-rise building and fixed by bolting. I do.

FIG. 7 is a diagram showing the distribution of stress acting on the steel frame of a middle-to-low-rise building due to shaking. As shown in FIG.
The stress acting on the steel frame on the first floor of the middle and low-rise building is the largest, and the stress acting on the steel frame on each floor gradually decreases as it goes up the second and third floors. In each floor, the stress increases toward the upper part of the steel frame (the upper part of the column 1).

Therefore, as in the present embodiment, the hook A is fixed to the upper part of the pillar 1 serving as the steel frame on the first floor, which is a large opening of the middle and low-rise building, and the beam 2 on the ceiling of the first floor. By doing so, the rigidity of the steel frame on the first floor of the medium- and low-rise building on which the maximum stress acts can be increased, and a more effective vibration damping action can be exerted against minute vibration of the middle and low-rise building due to traffic vibration It is.

It is most effective to attach the brace A to a steel frame on the first floor of a low-rise building. However, if the brace A is similarly fixed to a steel frame on the second floor, third floor, etc. The damping effect can be improved.

In particular, when a space for parking a car is provided on the first floor of a low-rise building, as shown in FIGS. 1 and 2, the upper corner of the opening 11 on the first floor of the low-rise building is located at the upper corner. Pillar 1
By fixing the brace A on the bridge 2 and the beam 2, it is possible to increase the rigidity of the low-rise building, and at the same time, secure a space for entering and exiting the opening 11 to facilitate entry and exit of automobiles and the like. Effective use of space is possible.

According to the above construction, the brace A provided on the steel frame of the middle-to-low-rise building has a surface joint set so as to exert a predetermined movable frictional force. With respect to the minute vibration of the above, the rigidity of the middle and low-rise building is increased by the brace A to exert a vibration damping action.

When a force larger than the traffic vibration acts on the middle and low-rise building due to an earthquake or the like, a movable processing portion 3d and a movable spacer formed on the plate portion 3b of the gusset plate 3 serving as a surface joint of the brace A are provided. 5 and becomes movable between the movable processing unit 5b and the high-strength bolt 7 moves along the elongated hole 3e formed in the plate portion 3b of the gusset plate 3 in accordance with the displacement of the middle- and low-rise building. No excessive force is applied to the peripheral part.

When the sway of the medium-to-low-rise building converges, the high-strength bolt 7 returns to the substantially central position of the elongated hole 3e,
The movable processing part 3d formed on the plate part 3b of the gusset plate 3 and the movable processing part 5
b, the movable frictional force is maintained and reproducibility is secured.

In the above embodiment, the movable spacer 5 is formed in a disk shape. However, the movable spacer 5 may be formed in various shapes other than the disk shape, such as a square shape, a triangular shape, an elliptical shape, an elliptical shape, and the like. The movable processing portion 3d may be formed on the plate portion 3b of the gusset plate 3 according to the moving area of the movable spacer 5.

As the staff member constituting the staff A, an H-section steel, an I-section steel, an angle section steel, a T-section steel, a flat steel, a square pipe, or the like is appropriately used instead of the channel steel 4. But it is good.

Also, it is preferable that the assembly is set in advance in a factory or the like so as to exert a predetermined movable frictional force between the plate portion 3b of the gusset plate 3 to be the surface joint of the brace A and the movable spacer 5. The cane A is carried into the construction site of the middle and low-rise building, and the gusset plates 3 attached to the both ends of the cane A are hung over the pillars 1 and the beams 2 serving as the steel frame of the middle and low-rise building and fixed by bolting. According to this construction method, there is no need to set the movable frictional force of the surface joint of the brace A at the site, so that the workability is good and the construction period can be shortened.

It is to be noted that the movable frictional force of the surface joint of the brace A may be appropriately set at the construction site if necessary, or that the brace A itself is assembled at the construction site and then fixed to the steel frame of the middle and low-rise building. You can do it.

In the above embodiment, a slot 3e and a movable processing portion 3d are formed in the gusset plate 3 on the beam 2 side. Although the description has been given of the case in which the slot is formed, the slot 3e and the movable processing section 3d are formed in the gusset plate 3 on the column 1 side, and the movable spacer 5 is interposed between the gusset plate 3 and the channel steel 4 to interview the stick A. A joint may be formed.

Next, a second embodiment of the vibration damping structure for a low-rise building according to the present invention will be described with reference to FIG. FIG. 8 is an assembly explanatory view showing the configuration of the second embodiment of the vibration damping structure for a middle-to-low-rise building according to the present invention. The same components as those in the first embodiment are denoted by the same reference numerals, and description thereof is omitted.

In the present embodiment, as shown in FIG.
A gusset plate 3 fixed to the lower flange 2a by welding or the like is provided, and a channel steel 4 serving as a cane member constituting at least the cane A is formed on both surfaces of the plate portion 3b of the gusset plate 3. A movable processing section 3d forming a surface joining section is formed in a predetermined area at a portion to be joined. An elongated hole 3e is formed substantially at the center of the movable processing portion 3d along the direction in which the staff A is arranged.

The movable processing portion 3d is formed by solid lubricating both surfaces of the plate portion 3b of the gusset plate 3 with a movable processing material or the like to have a predetermined friction coefficient.
e is formed to have a predetermined area including the movable range of the channel steel 4 moving along e.

The opposite side (back side) of the pair of channel steel 4 to the groove side
Has a predetermined area including the movable range of the channel steel 4 moving along the elongated hole 3e formed in the plate portion 3b of the gusset plate 3, and is subjected to solid lubrication by a movable processing material or the like. A movable processing unit 4b having a predetermined coefficient of friction is formed.

In the first embodiment, the movable spacer 5 is interposed between the plate portion 3b of the gusset plate 3 and the channel steel 4, but in the present embodiment, the movable spacer 5 is omitted and the beam 2 is formed. The movable processing part 3d of the plate part 3b of the provided gusset plate 3 and the movable processing part 4b of the channel steel 4 are brought into direct contact with each other, and the high-strength bolt 7 is attached to the channel steel 4 as in the first embodiment. Bolt hole 4a and plate portion 3b of gusset plate 3
And a nut 9 and a lock nut 10 are screwed into the high-strength bolt 7 via a flat washer 8 and fastened with a predetermined tightening torque to be fixed.

As in the case of the first embodiment, the small vibration of the middle and low-rise building is increased by the brace A against the minute vibration of the middle and low-rise building due to the traffic vibration, and the vibration vibration is exerted by the earthquake and the like. When a larger force is applied to the middle and low-rise building, the movable processing part 4b formed on the channel 4 and the movable processing part 3d formed on the plate part 3b of the gusset plate 3 as the surface joint of the brace A And the high-strength bolt 7 moves along the elongated hole 3e formed in the plate portion 3b of the gusset plate 3 in accordance with the displacement of the low-rise building, and excessive force is exerted on the periphery of the brace A. Is not taken.

When the sway of the medium-to-low-rise building converges, the high-strength bolt 7 returns to the substantially central position of the elongated hole 3e,
Movable processing part 4b formed in channel steel 4 which becomes the surface joint of
The movable frictional force between the movable processing unit 3d formed on the plate portion 3b of the gusset plate 3 and the movable processing unit 3d is maintained, and reproducibility is secured.

The other structure is the same as that of the first embodiment, and the same effect can be obtained.

Next, a third embodiment of the vibration damping structure for a low-rise building according to the present invention will be described with reference to FIG. FIG. 9 is an assembly explanatory diagram showing the configuration of the third embodiment of the vibration damping structure for a middle-to-low-rise building according to the present invention. In addition, components configured in the same manner as the above-described embodiments are denoted by the same reference numerals, and description thereof is omitted.

In this embodiment, as shown in FIG.
A surface joining portion is formed on both surfaces of the plate portion 3b of the gusset plate 3 which is fixed to the lower flange 2a by bolting, at least where the T-shaped steel 21 serving as the staff member constituting the staff A is joined. Are formed in a predetermined area. In addition, two elongated holes 3e arranged side by side along the direction in which the staff A is arranged are formed substantially in the center of the movable processing unit 3d.

The movable processing section 3d is formed by subjecting both surfaces of the plate section 3b of the gusset plate 3 to solid lubrication processing with a movable processing material or the like and having a predetermined coefficient of friction. It is formed to have a predetermined area including the movable range of the T-section steel 21 moving along the three long holes 3e.

On the surface of the flange 21b on the opposite side (back side) of the T-shaped steel 21 from the web 21a side, the T-shaped steel moving along the elongated hole 3e formed in the plate portion 3b of the gusset plate 3.
A movable processing portion 21c having a predetermined area including the movable range of 21 and being subjected to solid lubrication processing by a movable processing material or the like and having a predetermined friction coefficient is formed.

The movable processing portion 3d of the plate portion 3b of the gusset plate 3 fixed to the beam 2 by omitting the movable spacer 5 used in the first embodiment and the T-shaped steel as in the second embodiment. The high-strength bolt 7 is formed in the bolt hole 21d formed in the flange 21b of the T-section steel 21 and the plate portion 3b of the gusset plate 3 in the same manner as in the first embodiment by directly contacting the movable processing portion 21c. The nut 9 and the lock nut 10 are screwed into the high-strength bolt 7 via the flat washer 8 and fastened with a predetermined tightening torque and fixed. 3a is brought into contact with the lower flange 2a of the beam 2 and fixed by bolting.

In the same manner as in the first embodiment, with respect to minute vibrations of the low-rise building due to traffic vibration, the rigidity of the low-rise building is increased by the stick A to exert a vibration damping action, and the traffic vibration is caused by an earthquake or the like. When a larger force is applied to the middle and low-rise building, the movable processing part 21c formed on the T-shaped steel 21 and the movable processing part 3d formed on the plate part 3b of the gusset plate 3 to be the surface joint of the brace A And the high-strength bolt 7 moves along the elongated hole 3e formed in the plate portion 3b of the gusset plate 3 in accordance with the displacement of the low-rise building, and excessive force is exerted on the periphery of the brace A. Is not taken.

When the shaking of the low-rise building converges, the high-strength bolt 7 returns to the position substantially at the center of the elongated hole 3e, and
Movable processing part 21c formed in T-section steel 21 to be the surface joint of
The movable frictional force between the movable processing unit 3d formed on the plate portion 3b of the gusset plate 3 and the movable processing unit 3d is maintained, and reproducibility is secured.

Other configurations are the same as those of the above embodiments, and the same effects can be obtained.

Next, a fourth embodiment of the vibration damping structure for a medium-to-low-rise building according to the present invention will be described with reference to FIG. FIG. 10 is an assembly explanatory view showing the configuration of the fourth embodiment of the vibration damping structure for a low-rise building according to the present invention. In addition, components configured in the same manner as the above-described embodiments are denoted by the same reference numerals, and description thereof is omitted.

In each of the above embodiments, a pair of channel steel members 4 or a pair of T-shaped steel members 21 serving as a cane member are sandwiched back to back on both sides of the plate portion 3b of the gusset plate 3 serving as the connecting member. Although this is an example of the brace A, in the present embodiment, as shown in FIG. 10, a pair of L-shaped brackets 31 serving as a connecting member fixed to the beam 2 by bolting are back-to-back. This is an example of a staff A constructed in a state where one flat steel 32 serving as a staff member is interposed therebetween.

A movable processing portion 31c having a predetermined area is formed at least at a portion of the surface of the plate portion 31b of the bracket 31 on the side of the flat steel 32 where the flat steel 32 serving as the brace member constituting the brace A is joined. ing. The movable processing part 31c is a plate part 31b of the bracket 31.
Is made to have a predetermined coefficient of friction by performing a solid lubrication treatment on a surface thereof with a movable treatment material or the like.
Are formed so as to have a predetermined area including a movable range of the flat steel 32 moving along the elongated hole 32a formed along the direction in which the flat bar 32 is arranged.

Further, the flat steel 32 forming the surface joint of the brace A
Both surfaces have a predetermined area including a movable range of the flat bar 32 moving along the long hole 32a of the flat bar 32, and have a predetermined friction coefficient by solid lubrication processing with a movable processing material or the like. A movable processing section 32b is formed.

Then, similarly to the above embodiments, the first
The movable processing portion 31c formed on the plate portion 31b of the bracket 31 by omitting the movable spacer 5 used in the embodiment, and the flat steel 32
The high-strength bolt 7 is attached directly to the movable processing portion 32b formed on both surfaces of the
The nut 9 and the lock nut 10 are inserted into the bolt holes 31d formed in the plate portion 31b of the 31 and the elongated holes 32a formed in the flat steel 32, and screwed into the high-strength bolts 7 via the flat washers 8. After tightening and fixing with a predetermined tightening torque, the flange 31 a of the bracket 31 abuts against the lower flange 2 a of the beam 2 and is fixed by bolting.

As in the case of the first embodiment, the small vibration of the middle and low-rise building is increased by the stick A to exert a vibration damping action against the minute vibration of the middle and low-rise building due to the traffic vibration. When a larger force is applied to the middle and low-rise building, the movable processing part 32b formed on the flat steel 32 and the movable processing part 31c formed on the plate part 31b of the bracket 31 become the surface joining part of the brace A. The flat bar 32 moves while engaging with the high-strength bolt 7 along the elongated hole 32a formed in the flat bar 32 in accordance with the displacement of the low-rise building. No excessive force is applied.

When the sway of the low-rise building converges, the flat steel 32 returns to its original position, and the flat steel
The movable processing part 32b formed on the plate 32 and the plate part 31 of the bracket 31
The movable frictional force between the movable processing unit 31c and the movable processing unit 31c is maintained to ensure reproducibility.

Other configurations are the same as those of the above-described embodiments, and the same effects can be obtained.

Next, referring to FIG. 11, a fifth embodiment of the vibration control structure for a low-rise building according to the present invention will be described. FIG. 11 is an assembly explanatory view showing the configuration of the fifth embodiment of the vibration damping structure for a medium-to-low-rise building according to the present invention. In addition, components configured in the same manner as the above-described embodiments are denoted by the same reference numerals, and description thereof is omitted.

In each of the above embodiments, the gusset plate 3
And a connecting member such as a bracket 31 and a groove member such as the channel steel 4 or the T-shaped steel 21 or the flat steel 32 are provided with a surface bonding portion, but in the present embodiment, As shown in FIG. 11, two long holes 2b are formed side by side along the longitudinal direction of the beam 2 on the lower flange 2a of the beam 2 made of H-shaped steel, and the lower flange 2a including the long hole 2b is formed. The movable processing part 2c is provided at least at the part where the joint part 4c formed at the end of the channel steel 4 which becomes the staff member constituting the staff A on the lower surface is joined.
Are formed in a predetermined area.

The movable processing portion 2c is formed by subjecting the lower surface of the lower flange 2a of the beam 2 to solid lubrication using a movable processing material or the like and having a predetermined coefficient of friction. Channel steel 4 moving along the formed elongated hole 2b
And has a predetermined area including the movable range of the joint 4c.

Further, the upper surface of the joint 4c of the channel steel 4 constituting the surface joint of the brace A is solid-lubricated with a movable treatment material or the like over the entire surface to perform a movable process having a predetermined coefficient of friction. The part 4b is formed.

Then, similarly to the above embodiments, the first
The movable processing unit 2c formed on the lower surface of the lower flange 2a of the beam 2 and the movable processing unit 4 formed on the upper surface of the joint 4c of the channel steel 4 omitting the movable spacer 5 used in the embodiment.
b and the high-strength bolt 7 in the same manner as in the first embodiment, and the bolt hole 4a formed in the long hole 2b formed in the lower flange 2a of the beam 2 and the joint 4c of the channel steel 4 as in the first embodiment. And a nut 9 and a lock nut via a flat washer 8
10 is screwed into the high-strength bolt 7 and tightened and fixed with a predetermined tightening torque.

In the same manner as in the first embodiment, with respect to minute vibrations of the middle and low-rise buildings due to traffic vibration, the rigidity of the middle and low-rise buildings is increased by the stick A to exert a vibration damping effect, and the traffic vibration is caused by an earthquake or the like. When a larger force is applied to the middle and low-rise building, the movable processing part 4b formed at the joint 4c of the channel steel 4 and the lower surface of the lower flange 2a of the beam 2 are formed. It becomes movable with the movable processing unit 2c, and the channel steel 4 moves along with the high-strength bolt 7 along the elongated hole 2b formed in the lower flange 2a of the beam 2 in accordance with the displacement of the middle and low-rise building, No excessive force is applied to the peripheral part of the staff A.

When the sway of the low-rise building converges, the channel 4 returns to its original position and is formed on the upper surface of the joint 4c of the channel 4 to be the surface joint of the brace A. Movable processing unit 4
The movable frictional force between b and the movable processing portion 2c formed on the lower surface of the lower flange 2a of the beam 2 is maintained, and reproducibility is secured.

Other configurations are the same as those of the above-described embodiments, and the same effects can be obtained.

Next, a sixth embodiment of the vibration damping structure for a low-rise building according to the present invention will be described with reference to FIGS.
FIG. 12 is a front view showing the configuration of the first floor of a steel frame of a low-rise building equipped with a sixth embodiment of the vibration control structure for a low-rise building according to the present invention, and FIG. It is an assembly explanatory view showing a configuration of a sixth embodiment of a vibration damping structure.
In addition, components configured in the same manner as the above-described embodiments are denoted by the same reference numerals, and description thereof is omitted.

In the first to fourth embodiments, the connecting members such as the gusset plate 3 and the bracket 31 and the channel steel 4 and T
In the fifth embodiment, the lower flange 2a of the beam 2 and the groove member such as the channel steel 4 are provided in the fifth embodiment. Although it was configured by providing a surface joining portion at the joining portion with the above, in the present embodiment,
As shown in FIG. 12, a channel steel 4 serving as a brace member is divided into two parts, and a surface connection part is provided at a connection part between the groove steel members 4.

As shown in FIG. 12, one end of a channel steel member 4 serving as a cane member divided into two by a gusset plate 3 serving as a connecting member fixed to the column 1 and the beam 2 by bolting or the like is bolted. The other end of the channel steel 4 is joined by a joining member 41.

As shown in FIG. 13, one end of the joining member 41 is fixed to the other end of the joining member 41 by a bolt or the like while being sandwiched between a pair of channel steels 4 arranged back to back. An elongated hole 41a is formed along the direction in which the staff A is arranged.

At both sites including the long hole 41a of the joining member 41, at least a portion where the other channel steel 4 serving as the cane member constituting the cane A is joined is formed with a surface joint portion of the cane A. The movable processing section 41b is formed with a predetermined area.

The movable processing portion 41b is formed by solid lubricating both surfaces of the joining member 41 with a movable processing material or the like so as to have a predetermined coefficient of friction, and has one end fixed to one channel steel 4. It has a predetermined area including the movable range of the other channel 4 moving along the elongated hole 41a formed at the other end of the joined joining member 41.

The surfaces of the pair of channel steel members 4 on the side opposite to the groove side (the back side) of the pair to be joined to the long hole 41a side of the joining member 41 are subjected to solid lubrication treatment with a movable treatment material or the like. The movable processing part 4b having a predetermined coefficient of friction is formed by the groove member 4 and the joining member 41.
And has a predetermined area including a movable range that moves along the elongated hole 41a formed in the hole.

The first embodiment is similar to the first embodiment.
Omitting the movable spacer 5 used in the embodiment, a joining member
The movable processing portion 41b formed on both surfaces of the 41 and the movable processing portion 4b formed on the back surface of the channel steel 4 are brought into direct contact with each other, so that the high-strength bolt 7 is formed in the same manner as in the first embodiment. Bolt hole 4a formed in steel 4 and long hole 41 formed in joining member 41
a, and the nut 9 and the lock nut 10 are screwed into the high-strength bolt 7 via a flat washer 8 and fastened with a predetermined tightening torque, and then the flange 3 a of the gusset plate 3 is fixed to the beam 2. And is fixed by bolting.

As in the case of the first embodiment, the small vibration of the middle and low-rise building is increased by the brace A against the minute vibration of the middle and low-rise building due to the traffic vibration. When a larger force is applied to the middle and low-rise building, the movable processing portions 4b formed on the back surface of the channel steel 4 and the movable processing portions formed on both surfaces of the joining member 41, which are the surface joining portions of the brace A, The channel steel 4 moves along with the high-strength bolt 7 along the elongated hole 41a formed in the joining member 41 in accordance with the displacement of the low-rise building, and becomes excessively large in the peripheral portion of the brace A in accordance with the displacement of the low-rise building. No force is applied.

When the sway of the low-rise building converges, the channel steel 4 returns to its original position, and the movable processing part 4b formed on the channel steel 4 to be the surface bonding part of the brace A and the connecting member. The movable frictional force between the movable processing unit 41b and the movable processing unit 41b is maintained, and reproducibility is secured.

The other components are configured in the same manner as in the above-described embodiments, and the same effects can be obtained.

Next, with reference to FIG. 14, a damper having a function as a part of a building frame as in the conventional example, in the case where the vibration damping structure of the middle and low-rise building according to the present invention is adopted, in the case where it is not adopted, and in the conventional example. A description will be given of a comparative example in a case where a vibration damping structure equipped on a brace is employed.

FIGS. 14A to 14D are plan views of the first floor of a low-rise building having a large opening such as a parking space.
Fig. 14 (a) is a diagram showing an example of shaking when a force in the range of traffic vibration is applied to a medium-to-low-rise building in which a brace is not fixed to a steel frame, and Fig. 14 (b) shows a case where a surface joint is provided in the steel frame. FIG. 14 (c) is a diagram showing an example of shaking when a force in the range of traffic vibration is applied to a medium-to-low-rise building to which a cane is fixed. FIG. 14 (c) shows a steel cane having a damper functioning as a part of the building frame. Fig. 14 (d) shows an example of shaking when a force greater than the force in the traffic vibration range is applied to a low-rise building with a fixed frame, and Fig. 14 (d) shows a low-rise building with a hook that has a surface joint on the steel frame. FIG. 6 is a diagram showing an example of a swing when a force larger than the force in the traffic vibration range acts on the vehicle.

14 (a) to 14 (d), a wall 12 is arranged between columns 1 serving as a steel frame of a low-rise building.
Reference numeral 11 denotes an opening having a large opening such as a parking space, and reference numeral 13 denotes a door through which the opening 11 enters and exits the inside of the low-rise building.

In FIG. 14 (a), when a force in the traffic vibration range acts in a structure in which the beam is not fixed between the column 1 and the beam (not shown), the wall 12 is arranged to be offset to provide the opening 11. Have been. Secondary members such as the wall 12 contribute to building rigidity when the force of the micro-vibration is small, so the rigidity balance is poor, and a large displacement 14a occurs particularly on the opening 11 side (the lower side of FIG. 14A). I do.

On the other hand, as shown in FIG. 14 (b), when the above-described vibration damping structure for a middle-to-low-rise building according to the present invention is provided, if the vibration damping structure is provided in front of the opening 11 (lower side of FIG. 14 (b)). The rigidity of the middle and low-rise building was increased by fixing the brace A having the rigidity corresponding to the rigidity when the wall 12 was arranged between the column 1 and the beam (not shown), and the force in the traffic vibration range was applied. Even in such a case, the torsion of the steel frame body or the like is suppressed, and the small shaking 14b is suppressed.

FIG. 14 (c) shows a low-rise building with a brace B having a damper functioning as a part of the building frame fixed between a pillar 1 and a beam (not shown). When a force larger than the force acts on the brace B, the brace B exerts a vibration damping action and also functions as a structural member to bear the seismic force.

While the wand B bears a strong force, the wall 12 is not a structural member, so it cannot bear a large force such as an earthquake, and is partially destroyed. Figure
The displacement of the sway 14c (above 14 (c)) increases, causing a large torsion in the low-rise building.

On the other hand, as shown in FIG. 14 (d), when the above-described vibration damping structure for a low-rise building according to the present invention is provided, when a force larger than the force in the traffic vibration range acts on the low-rise building. Then, the surface joint transitions to the movable state to release the force due to the earthquake, and the middle and low-rise buildings exhibit the behavior according to the preset structural calculation, so that they are suppressed by small shaking 14d, and no large twisting occurs in the buildings.

[0094]

As described above, the present invention has the above-described structure and operation. Therefore, since the brace provided on the steel frame of the middle and low-rise building has a surface joint, it is possible to reduce the minute vibration of the middle and low-rise building due to traffic vibration. On the other hand, the rigidity of the middle and low-rise building is increased by the brace to exert the damping effect, and when a force greater than the traffic vibration acts on the middle and low-rise building due to an earthquake etc., it becomes movable at the surface joint of the brace No excessive force is applied to the periphery of the cane, making it a flexible structure for a low-rise building.

Further, according to the method for constructing a vibration damping structure of a low-rise building according to the present invention, the frictional force at which the surface joint of the brace transitions to the movable state is preset in a factory or the like.
Workability on site is improved.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a configuration of a steel frame of a middle and low-rise building equipped with a vibration damping structure for a middle and low-rise building according to the present invention.

FIG. 2 is a front view showing the structure of the first floor of the steel frame of the low-rise building equipped with the first embodiment of the vibration control structure of the low-rise building according to the present invention.

FIG. 3 is an explanatory front view showing a configuration of a gusset plate serving as a connecting member of a square stick used in the first embodiment of the vibration damping structure for a low-rise building according to the present invention.

FIG. 4 is an explanatory cross-sectional view showing a state in which a gusset plate serving as a connecting member of the cane and a grooved steel serving as a cane member are joined by a surface joining portion in the first embodiment.

FIG. 5 is a cross-sectional explanatory view showing a state in which a gusset plate serving as a connecting member of the cane and a grooved steel serving as a cane member are joined by a surface joining portion in the first embodiment.

FIG. 6 is a diagram showing a configuration of a movable spacer interposed in a surface joint of a brace in the first embodiment.

FIG. 7 is a diagram showing a distribution of stress acting on a steel frame of a middle and low-rise building due to shaking.

FIG. 8 is an assembly explanatory diagram showing a configuration of a second embodiment of a vibration damping structure for a middle-to-low-rise building according to the present invention.

FIG. 9 is an assembly explanatory diagram showing a configuration of a third embodiment of a vibration damping structure for a middle-to-low-rise building according to the present invention.

FIG. 10 is an assembly explanatory diagram showing a configuration of a fourth embodiment of a vibration damping structure for a middle-to-low-rise building according to the present invention.

FIG. 11 is an assembly explanatory diagram showing a configuration of a fifth embodiment of a vibration damping structure for a middle and low-rise building according to the present invention.

FIG. 12 is a front view showing a configuration of a first floor portion of a steel frame of a low-rise building equipped with a sixth embodiment of a vibration control structure for a low-rise building according to the present invention.

FIG. 13 is an assembly explanatory diagram showing a configuration of a sixth embodiment of a vibration damping structure for a middle-to-low-rise building according to the present invention.

14 (a) to (d) are first-floor plan views of a medium-to-low-rise building having a large opening such as a parking space, and (a) is a traffic diagram of a medium-to-low-rise building in which a hook is not fixed to a steel frame. The figure which shows an example of the sway when the force of a vibration range acts, (b) is an example of the sway when the force of the traffic vibration range acts in the medium-to-low-rise building which fixed the stick which has the surface joint to the steel frame. (C) shows the swing of a medium-to-low-rise building in which a steel beam frame is fixed with a beam stick having a damper functioning as a part of the building frame when a force larger than the traffic vibration range is applied. FIG. 4D is a diagram illustrating an example of a shaking when a force larger than a force in a traffic vibration range is applied to a medium-to-low-rise building in which a brace having a surface joint is fixed to a steel frame body.

[Explanation of Signs] A, B: Brace 1: Pillar 2: Beam 2a: Lower flange 2b: Slot 2c: Movable processing part 3: Gusset plate 3a: Flange 3b: Plate part 3c: Reinforcement plate 3d: Movable processing part 3e… long hole 3f… bolt hole 4… channel steel 4a… bolt hole 4b… movable processing part 4c… joining part 5… movable spacer 5a… bolt hole 5b… movable processing part 6… movable range 7… high strength bolt 8… Flat washer 9 Nut 10 Lock nut 11 Opening 12 Wall 13 Door 14 a-14 d Shaking 21 T-shaped steel 21 a Web 21 b Flange 21 c Movable processing part 21 d Bolt hole 31 Bracket 31 a Flange 31b ... plate part 31c ... movable processing part 31d ... bolt hole 32 ... flat steel 32a ... long hole 32b ... movable processing part 41 ... joining member 41a ... long hole 41b ... movable processing part

 ────────────────────────────────────────────────── ─── Continued on the front page (72) Inventor Takashi Kurosawa 1-2-1 Yurakucho, Chiyoda-ku, Tokyo Asahi Kasei Kogyo Co., Ltd. F-term (reference) 2E001 DG01 EA05 FA01 FA02 FA73 GA01 GA52 GA55 GA56 GA59 GA66 HB02 LA02 LA18

Claims (2)

[Claims] 1. A steel frame of a low-rise building having a brace for increasing the rigidity of the low-rise building, wherein the brace maintains rigid contact when a force in a traffic vibration range acts, and A vibration damping structure for a medium-to-low-rise building, characterized by having a surface joint that is movable when a force greater than the force in the vibration range acts. 2. A method of constructing a vibration control structure for a low-rise building, comprising preparing the brace according to claim 1 in advance and fixing the brace to a steel frame of a low-rise building.