JP4773215B2 - Damping braces and damping structures - Google Patents

Description

  The present invention relates to a vibration suppression brace provided obliquely in a frame surface surrounded by columns and beams, and a vibration suppression structure including the vibration suppression brace.

Conventionally, the thing of patent document 1 is known as an example of the damping structure of a building. The vibration damping structure described in Patent Document 1 has a damper (vibration damping member) interposed in the middle of a brace installed via a mounting gusset or the like in an internal space of a frame surrounded by columns and beams. This damper absorbs vibration energy in the event of an earthquake or the like, and is called a brace-type vibration damping device.
JP 2003-49557 A

  However, in the above brace type vibration damping device, when the deformation of the building due to an earthquake or the like is small, the deformation transmitted to the vibration damping member (energy absorbing material) is also small. The damping force that attenuates the vibration is also reduced, and the damping structure does not work very effectively. Therefore, it has been necessary to increase the number of locations of the damping members.

  The present invention has been made in view of the above circumstances. A vibration damping brace of a building that can absorb a large amount of energy even when the deformation of the building frame due to an earthquake or the like is small and can exhibit a large damping force, and the vibration damping brace. The objective is to provide a vibration control structure.

In order to solve the above problems, the invention described in claim 1 is a control provided obliquely in a frame surface surrounded by columns 4 and 5 and beams 2 and 3, as shown in FIGS. A vibration brace 10,
A pair of brace members 10a, 10a arranged in parallel with each other at a predetermined interval and with the tip portions overlapped in a direction orthogonal to the axial direction;
A pair of connecting members 11, 11 for connecting the pair of brace members 10a, 10a that overlap each other at two locations spaced apart in the axial direction of the brace member;
The pair of connecting members 11 and 11 are pivotally connected to the pair of brace members 10a and 10b, respectively, and opposite portions are connected by vibration damping means 13.

According to the first aspect of the present invention, a tensile force or a compressive force acts on the pair of brace members 10a and 10b due to deformation of the frame surface surrounded by the columns 4 and 5 and the beams 2 and 3 due to an earthquake or the like. Then, the pair of connecting members 11, 11 rotate about the pivot position 12 with the brace material 11. Since the connecting members 11 and 11 are pivotally connected to the pair of brace members 10a and 10b, respectively, the pivoting positions 12 and 12 are entirely turned by rotating around the pivoting positions 12. It swings as it rotates around the center of the fulcrum. Accordingly, the vibrations of the portions of the one connecting member 11 and the other connecting member 11 that are opposed to each other are amplified by the principle of leverage and are swung so as to rotate in opposite directions.
Therefore, since the deformation of the vibration damping means 13 connecting the opposing portions of the pair of connecting members 11 and 11 can be amplified, vibration energy can be absorbed from a small deformation of the building frame, and the damping function is effectively used. be able to.

The invention according to claim 2 is the vibration-damping brace according to claim 1,
The pair of connecting members 11, 11 and the vibration damping means 13 constitute a coupling damping means 20,
The connection damping means 20 is provided in a pair so as to sandwich the tip end portion where the pair of brace members 10a and 10b overlap from the side surface side.

  According to the second aspect of the present invention, the overlapping tip portions of the pair of brace members 10a and 10b are sandwiched between the pair of connection damping means 20 and 20, so that the tension acting on the pair of brace members 10a and 10b is applied. Vibrations due to compression force can be damped in a balanced manner.

The invention according to claim 3 is the vibration-damping brace according to claim 2,
The vibration damping means 13 includes a viscoelastic body 14 and a pair of plates 15a and 15b coupled so as to sandwich the viscoelastic body 14 therebetween.
One plate 15 a is coupled to the one connecting member 11, and the other plate 15 b is coupled to the other connecting member 11.

  According to the invention described in claim 3, the vibration damping means 13 includes the viscoelastic body 14 and the pair of plates 15 a and 15 b coupled so as to sandwich the viscoelastic body. This vibration damping means 13 can be easily made into a part. And since one plate 15a of the vibration damping means 13 made into a part is coupled to one connecting member 11, and the other plate 15b is coupled to the other connecting member 11, the vibration damping means 13 can be easily operated. The vibration brace 10 can be incorporated. Further, the vibration damping means 13 can be easily replaced or repaired.

According to a fourth aspect of the present invention, in the vibration damping brace of the third aspect,
At least one of the plates 15a and the one connecting member 11 are connected via a second viscoelastic body 17.

  According to the fourth aspect of the present invention, since at least one plate 15a and one connecting member 11 are coupled via the second viscoelastic body 17, vibration can be damped more effectively. Further, when a step is generated between the one plate 15 a and the one connecting member 11, the second viscoelastic body 17 is disposed at the step, whereby the one plate 15 a and the one connecting member 11 are disposed. Can be connected easily and reliably.

The invention according to claim 5 is the vibration-damping brace according to claim 3 or 4,
In the viscoelastic bodies 14 and 17, 100 to 150 parts by weight of silica is added to 100 parts by weight of the base rubber having a C—C bond in the main chain, and the silane compound is added to 10 to 30% by weight based on the silica. It is characterized by being blended.

  According to the fifth aspect of the present invention, since the viscoelastic bodies 14 and 17 can have appropriate strain dependency, frequency dependency, and temperature dependency, the vibration damping function, that is, the vibration suppression function can be sufficiently provided. It can be demonstrated.

The invention according to claim 6 is the vibration-damping brace according to any one of claims 1 to 5,
When the position where the connecting member 11 is connected to the brace members 10a and 10b is a pivot position 12,
From the distance l in the direction orthogonal to the axial direction of the brace material between the pivot position 12 and the central portion of the vibration damping means 13, the distance between the pivot position 12 and the central portion of the vibration damping means 13 is determined. The distance L in the axial direction of the brace material is set to be long.

  According to the sixth aspect of the present invention, the vibrations are amplified by the principle of the levers of the one connecting member 11 and the other connecting member 11 which are opposed to each other. The distance L in the axial direction of the brace material between the pivot position 12 and the central portion of the vibration damping means 13 is determined from the distance l in the direction orthogonal to the axial direction of the brace material between the central portion of the vibration damping means 13 and the center portion of the vibration damping means 13. By setting it longer, it becomes larger. That is, the amplification effect is increased. Therefore, vibration energy can be absorbed more effectively from a small deformation of the building frame, and the damping function can be effectively used.

The invention according to claim 7 is the vibration-damping brace according to any one of claims 1 to 6,
The brace material 15b is provided with another vibration damping means 21 having a damping performance different from that of the vibration damping means 13.

  According to the seventh aspect of the present invention, the vibration damping means 13 and the vibration damping means 21 separately control a small vibration having a relatively small amplitude and a short period and a vibration having a relatively large amplitude and period. it can. Accordingly, it is possible to effectively control different vibrations.

The invention according to claim 8 is the vibration-damping brace according to any one of claims 1 to 7 in the frame surface surrounded by the columns 4 and 5 and the beams 2 and 3 constituting the building framework 1. In the damping structure in which 10 is provided obliquely,
With respect to the constituent members (columns 4 and 5 and beams 2 and 3) constituting the frame 1, both ends of the damping brace 10 are respectively formed as one component (for example, columns 4 and 5) of the frame 1. It is attached via the end fixing members 5a and 4a, and when the rolling occurs in the building, the end fixing members 5a and 4a have an attachment structure that does not suppress the relative deformation angle between the column and the beam. It is characterized by that.

  According to the invention described in claim 8, both the end portions of the vibration brace 10 are connected to one constituent member of the skeleton 1, and the end fixing members 4 a, Since the end fixing members 4a and 5a have a mounting structure that does not suppress the relative deformation angle between the column and the beam when the building is swayed and mounted, the vibration-damping brace 10 is attached. As a result, the rigidity of the joint portion of the constituent members of the skeleton 1 is not increased. For this reason, when a horizontal force acts on the building framework 1 due to rolling during an earthquake, strong wind, or traffic vibration, the force acting on the framework is absorbed by the deflection of the components of the framework 1. By compressing or pulling the vibration suppression brace 10, the ratio absorbed by the vibration suppression brace 10 becomes larger than the ratio. Thereby, the damping brace 10 can be functioned more effectively.

According to the vibration-damping brace according to the present invention, a pair of brace materials arranged in parallel with each other at a predetermined interval and having tip portions overlapped in a direction perpendicular to the axial direction, and the tip ends of the pair of brace materials overlapping each other And a pair of connecting members that connect the parts at two locations spaced apart in the axial direction of the brace material, the pair of connecting members being pivoted to the pair of brace materials, respectively, and opposing portions Are connected by vibration damping means, and when a tensile or compressive force is applied to a pair of brace materials due to an earthquake or the like, vibrations are amplified by the lever principle at the portions where one connecting member and the other connecting member face each other. And swings so as to rotate in opposite directions. Therefore, since the deformation of the vibration damping means connecting the opposing portions of the pair of connecting members can be amplified, the vibration energy can be absorbed from a small deformation of the building frame, and the damping function can be used effectively.
Further, both ends of such a vibration-damping brace are fixed to one structural member of the frame, respectively, and when a roll occurs in the building, the edge-fixing member of the vibration-damping brace becomes a column and a beam. Because it is an attachment structure that does not suppress the relative deformation angle, by compressing or pulling the damping brace rather than the rate at which the force acting on the frame is absorbed by the deflection of the structural members of the frame, The proportion absorbed by the damping brace increases. Thereby, the vibration suppression brace can be functioned more effectively.

Embodiments of the present invention will be described below with reference to the drawings.
(First embodiment)
1 to 7 are for explaining the first embodiment. In FIG. 1, the code | symbol 1 has shown the framework of the building which is an example of a structure. The frame 1 includes an upper beam 2, a lower beam 3, a column 4, and an intermediary column 5, and the frame according to the present invention is included in a frame surface surrounded by the upper beam 2, the lower beam 3, the column 4, and the intercolumn 5. A vibration brace 10 is provided obliquely.

  The damping brace 10 includes a pair of brace members 10a and 10b. The brace members 10a and 10b have a rectangular cylindrical shape, and are arranged in parallel with each other at a predetermined interval and with the tip portions overlapped in a direction perpendicular to the axial direction. A base end portion (upper end portion in FIG. 1) of the brace material 10 a is pin-coupled to a bracket (end portion fixing member) 5 a fixed to the upper end portion of the stud 5. Therefore, the brace material 10a can be turned up and down with the pin as a fulcrum. A base end portion (lower end portion in FIG. 1) of the brace material 10 b is pin-coupled to a bracket (end portion fixing member) 4 a fixed to the lower end portion of the column 4. Therefore, the brace material 10b can be turned up and down with the pin as a fulcrum.

The leading ends of the pair of brace members 10a and 10b are connected to each other by connecting members 11 and 11 at two locations spaced apart in the axial direction of the brace members 10a and 10b.
The connecting member 11 is formed in a rectangular plate shape, and the length of the short side thereof is slightly longer than the total thickness of the pair of brace members 10a and 10b. That is, it is slightly longer by the distance S between the brace materials 10a and 10b. And the base end part of the connection members 11 and 11 is pivoted by the volt | bolts 12 and 12 to the brace materials 10a and 10b, respectively. That is, the base end portion of one connecting member 11 is pivotally connected to the base end at the tip end portion of the brace material 10a and the tip end at the tip end portion of the brace material 11b, and the base end portion of the other connecting member 11 is The brace material 10a is pivotally connected to the distal end at the distal end portion and the proximal end at the distal end portion of the brace material 11b.
Therefore, as shown in FIG. 2, when the pair of brace members 10a and 10b are subjected to compression or tensile force and move in the axial direction, the connecting member 11 is positioned at the base end portions of the bolts 12 and 12, that is, pivotally. It pivots up and down with a substantially central part between the connection positions 12 and 12 as a fulcrum. FIG. 2 is a diagram schematically showing the pair of brace members 10a and 10b and the pair of connecting members 11 and 11 connecting them.

The pair of connecting members 11, 11 are connected by vibration damping means 13 at their opposing portions. That is, the distal ends of the connecting members 11 and 11 are connected by the vibration damping means 13.
As shown in FIGS. 3 to 6, the vibration coupling means 13 includes a viscoelastic body 14 and a pair of plates 15 a and 15 b coupled so as to sandwich the viscoelastic body 14. The viscoelastic body 14 is bonded and fixed to the opposing surfaces of the tips of the plates 15a and 15b by an adhesive or vulcanization adhesion. The viscoelastic body 14 is formed in a square plate shape, and a covering rubber 16 is stuck to each of the four side edges.

The plates 15 a and 15 b are narrower than the connecting member 11, and one plate 15 a is coupled to the one connecting member 11 via the second viscoelastic body 17. The other plate 15 b is directly coupled to the other connecting member 11. The coupling between the plates 15a and 15b and the connecting members 11 and 11 is formed so as to face the holes 18 ... formed in the plates 15a and 15b, respectively, and the connecting members 11 and 11 facing the holes 18 .... This is done by matching the screw holes and screwing the bolts 19. The second viscoelastic body 17 is also formed with holes at positions facing the holes 18.
Therefore, the vibration damping means 13 having the above configuration can be easily attached to and detached from the connecting members 11 and 11.
As shown in FIG. 4, the pair of coupling members 11, 11 and the vibration damping means 13 constitute a coupling damping means 20, and this coupling damping means 20 overlaps the pair of braces 10a, 10b. A pair is provided so as to sandwich the leading end portion from the side surface side.

As shown in FIG. 2, if the position where the connecting members 11 and 11 are connected to the brace members 10a and 10b is the pivot position 12, the pivot position 12 and the central portion of the vibration damping means 13, that is, From the distance l in the direction orthogonal to the axial direction of the brace material between the viscoelastic body 14 and the central portion 14a, the brace material between the pivot position 12 and the central portion 14a of the viscoelastic body 14 The distance L in the axial direction is set long.
As described above, the vibrations are amplified by the lever principle at the opposing portions (back end portions) of the one coupling member 11 and the other coupling member 11, and the amplification of the deflection is caused by the pivot position 12 and the viscoelasticity. From the distance l in the direction orthogonal to the axial direction of the brace material between the central portion 14a of the body 14 and the distance L in the axial direction of the brace material between the pivot position 12 and the central portion 14a of the viscoelasticity 14 and the like. By setting it longer, it becomes larger. That is, the amplification effect is increased.

As shown in FIG. 1, the brace material 10 b of the damping brace 10 is provided with other vibration damping means 21 having a damping performance different from that of the vibration damping means 13.
That is, the other vibration damping means 21 includes a pair of opposed plates 21a and 21a, a viscoelastic body 21b coupled to the opposed surfaces of the plates 21a and 21a, and the plates 21a and 21a. And a plurality of connecting bolts 21c to be connected. And the base end part (lower end part in FIG. 1) of the brace material 10b is couple | bonded with one plate 21a, the end member 10c is couple | bonded with the other plate 21a, and this end member 10c is attached to the said bracket 4a. Pin-coupled.
In such a vibration damping means 21, when a compression or tensile force is applied to the vibration suppression brace 10 due to the seismic force, the viscoelastic body 21 b is subjected to shear deformation and absorbs vibration energy to suppress vibration. It is like that.
The damped vibration means 13 and the other damped vibration means 21 have different damping performances. The damped vibration means 13 functions mainly when a small seismic force is applied to the damped vibration means 21, and the damped vibration means 21 is large. It functions mainly when seismic force is applied.

  The viscoelastic bodies 14, 17, and 21b provided in the vibration damping means 13 are obtained by adding 100 to 150 parts by weight of silica to 100 parts by weight of base rubber having a C—C bond in the main chain. It is formed of a high damping rubber containing 10 to 30% by weight of a silane compound.

Below, a viscoelastic material is demonstrated.
A general viscoelastic material increases in rigidity and resistance as the amplitude increases. If a viscoelastic body having the property that the rigidity increases as the amplitude increases, the acceleration response of the building and the stress of each part are excessively increased. Therefore, it is desirable to use a viscoelastic body having a property that the increase in rigidity reaches a peak even when the amplitude increases. In particular, in the present invention, since the viscoelastic body is subjected to a large shear deformation as compared with the amplitude of the vibration acting on the building, the effect of using the above-mentioned property with respect to strain dependency is great.

Also, since it is necessary to function in a wide range of amplitudes from environmental vibrations such as traffic vibrations to wind fluctuations during typhoons and large earthquakes, viscoelastic bodies with low strain dependence are used. That is, a material that exhibits stable vibration energy absorption capability from a small strain to a large strain is used.
Specifically, a stable energy absorption capability of Heq> 0.20 is required in the region of 0.01 ≦ γ ≦ 3.5. Therefore, Keq / (S / D) decreases as γ increases in a region where γ> 1.0 so that the resistance force does not increase in the large amplitude region. For example, 0.45 ≦ { It is preferable to use a viscoelastic body of Keq / (S / D) _{(γ = 3.0)} } / {Keq / (S / D) _{(γ = 1.0)} } <0.75.

Here, γ is a shear strain rate, and is obtained by dividing the shear deformation amount d of the viscoelastic body by the height t of the viscoelastic body, as shown in FIG. The equivalent viscous damping coefficient (equivalent damping constant) (Heq) and the equivalent shear modulus (Geq = Keq / (S / D)) in the dynamic viscoelasticity test are sine waves that cause shear deformation of the viscoelastic material. Excitation is performed, a history loop (hysteresis curve) at that time is measured, and calculation is performed based on the result. If it demonstrates based on FIG. 7, Heq is a numerical value calculated by the following formula | equation (Formula 1), and Keq / (S / D) is a numerical value calculated by the following formula | equation (Formula 2).
Heq = ΔW / 2πW (Equation 1),
W: elastic energy of shear deformation (area of two triangles shown in FIG. 13; unit is kgf · cm),
ΔW = total energy absorbed by shear deformation (area surrounded by hysteresis curve shown in FIG. 7, unit is kgf · cm),
Keq / (S / D) = F / U _pressure / (S / D) (Equation 2),
F: Load when giving maximum displacement (unit is kgf),
U _Be : Maximum displacement (unit: cm),
S / D: Shape factor of the test sample (sample shear area / sample shear gap, unit is cm)

In general viscoelastic materials, Geq (= Keq / (S / D)) [N / mm ² ] significantly increases with an increase in vibration frequency. For example, in a general viscoelastic body, at 20 ° C., the value of Geq increases 2 to 3 times at 0.1 Hz and at 2.0 Hz. The dominant frequency of traffic vibration is distributed between 4Hz and 7Hz, and the ground vibration is distributed between 0.1Hz and 20Hz, so viscoelasticity has relatively stable properties in terms of rigidity and damping performance against these frequencies. It is desirable to use the body. Specifically, it is necessary to deal with earthquake motions that have a wider input frequency distribution region. The damping performance imparted to the house by the damping material is generally the product of the rigidity of the damping material (here, the equivalent shear modulus (Geq)) and the damping constant (here, the equivalent viscous damping constant (equivalent damping constant) Heq). Can be expressed as Evaluation of frequency dependence may be performed within a range of ± 50% within the range of 0.1 Hz to 20 Hz of the above-described ground vibration with reference to the time when the value of the product is a certain frequency under a certain temperature condition. .

In general, viscoelastic bodies have high rigidity at low temperatures and low rigidity at high temperatures. In Japan, it is desirable to use a viscoelastic body having a relatively stable property in terms of rigidity and damping performance over a temperature range of about −10 ° C. to 40 ° C. since the temperature changes greatly throughout the year.
For example, if the use environment of the vibration damping structure according to the present invention is −10 ° C. to 40 ° C., the equivalent shear modulus when the low temperature side is −10 ° C. is based on Geq (equivalent shear modulus) at 20 ° C. Ratio of Geq (t = −10 ° C.) to equivalent shear modulus Geq (t = 20 ° C.) at 20 ° C., Geq (t = −10 ° C.) / Geq (t = 20 ° C.) ≦ 2.2 The high temperature side is the ratio of the equivalent shear modulus Geq (t = 40 ° C.) at 40 ° C. to the equivalent shear modulus Geq (t = 20 ° C.) at 20 ° C., Geq (t = 40 ° C.) / It is preferable that Geq (t = 20 ° C.) ≧ 0.6.

In the present embodiment, the viscoelastic body has, for example, silica based on 100 parts by weight of the base rubber having a C—C bond in the main chain in order to have the above-described strain dependency, frequency dependency, and temperature dependency. 100 to 150 parts by weight is added, and a high damping rubber containing 10 to 30% by weight of a silane compound based on the silica is used. As an example of such a suitable viscoelastic body, 135 parts by weight of silica is added to 100 parts by weight of the base rubber, and 17% by weight of a silane compound is added to the silica. According to this viscoelastic body, the above-described strain dependency, frequency dependency, and temperature dependency can be provided, and the function of the above-described vibration damping structure can be sufficiently exhibited.
In particular, the performance at 20 ° C. is in the range of Heq ≧ 0.2, 0.35 ≦ Geq ≦ 6.0 (N / mm ² ), and the temperature dependence of Geq is −10 ° C./20° C. ≦ 2.2, 40 ° C./20° C. ≧ 0.6 (both at a frequency of 0.1 Hz and a shear strain of ± 100%), and as described above, the viscoelastic body of the damping member is greatly shear deformed. The functions of the vibration damping structure can be fully exhibited.

〔式中、R¹、R²、R³およびR⁴のうち少なくとも１つはアルコキシ基、またはハロゲン原子を示し、他は同一または異なって水素原子、アルキル基またはアリール基を示す。〕で表されるシラン化合物とを含有するゴム組成物の加硫成形により形成される。また、基材ゴムとしては、主鎖にC−C結合を有する種々のゴムがいずれも使用可能である。具体的には天然ゴム（NR）の他、イソプレンゴム（IR）、ブタジエンゴム（BR）、スチレン−ブタジエン共重合ゴム（SBR）、エチレン−プロピレン共重合ゴム（EPM）、アクリロニトリル−ブタジエン共重合ゴム（NBR）、ブチルゴム（IIR）などが挙げられる。これらはそれぞれ単独で使用される他、２種類以上を併用することもできる。 The silane compound has the following general formula:

[Wherein, at least one of R ¹ , R ² , R ³ and R ⁴ represents an alkoxy group or a halogen atom, and the other represents the same or different and represents a hydrogen atom, an alkyl group or an aryl group. It is formed by vulcanization molding of a rubber composition containing a silane compound represented by the formula: As the base rubber, any of various rubbers having a C—C bond in the main chain can be used. Specifically, in addition to natural rubber (NR), isoprene rubber (IR), butadiene rubber (BR), styrene-butadiene copolymer rubber (SBR), ethylene-propylene copolymer rubber (EPM), acrylonitrile-butadiene copolymer rubber. (NBR), butyl rubber (IIR) and the like. These may be used alone or in combination of two or more.

As the silica added to the base rubber, various hydrophilic or hydrophobic silicas used as rubber reinforcing agents can be used. The addition amount of the silica is limited to 10 to 150 parts by weight with respect to 100 parts by weight of the base rubber. The reason for this is as described above.
In the silane compound represented by the general formula (1), examples of the alkoxy group corresponding to R ^{1 to} R ⁴ include those having various carbon numbers represented by C _n H _{2n + 1} O. Preferable examples include methoxy and ethoxy having 1 to 2 carbon atoms. Examples of the halogen atom include fluorine, chlorine, bromine and the like.

Examples of the alkyl group include those having various carbon numbers represented by C _n H _{2n + 1} , and the carbon number is particularly preferably about 1 to 20. Examples of the alkyl group include methyl, ethyl, n-propyl, isopropyl, n-butyl, isobutyl, secondary butyl, tertiary butyl, pentyl, hexyl, octyl, nonyl, decyl, undecyl, dodecyl and the like. It is done.
Examples of the aryl group include phenyl, tolyl, xylyl, biphenyl, o-terphenyl, naphthyl, anthryl, phenanthryl and the like. Specific examples of such silane compounds include, but are not limited to, n-hexyltrimethoxysilane, triethoxyphenylsilane, diethoxydimethylsilane, dimethyldichlorosilane, methyldichlorosilane, and the like.

  In addition to the above, the rubber composition includes, for example, a vulcanizing agent, a vulcanization accelerator, a vulcanization acceleration aid, a vulcanization retarder, a reinforcing agent other than silica, a filler, a softening agent, a plasticizer, and a tackifier. In addition, various additives may be added. Among these, examples of the vulcanizing agent include sulfur, organic sulfur-containing compounds, and organic peroxides. Among these, examples of the organic sulfur-containing compound include N, N′-dithiobismorpholine. Examples of organic peroxides include benzoyl peroxide and dicumyl peroxide.

  Examples of the vulcanization accelerator include thiuram vulcanization accelerators such as tetramethylthiuram disulfide and tetramethylthiuram monosulfide, zinc dibutyldithiocarbamate, zinc diethyldithiocarbamate, sodium dimethyldithiocarbamate, Dithiocarbamic acids such as tellurium diethyldithiocarbamate, thiazoles such as 2-mercaptobenzothiazole and N-cyclohexyl-2-benzothiazolesulfenamide, thioureas such as trimethylthiourea and N, N′-diethylthiourea Organic promoters, or inorganic promoters such as slaked lime, magnesium oxide, titanium oxide, and risurge (PbO) can be used.

  Examples of the vulcanization acceleration aid include fatty acids such as stearic acid, oleic acid and cottonseed fatty acid, and metal oxides such as zinc white. Examples of the vulcanization retarder include aromatic organic acids such as salicylic acid, phthalic anhydride, and benzoic acid, N-nitrosodiphenylamine, N-nitroso-2,2,4-trimethyl-1,2-dihydroquinone, and N-nitrosophenyl. And nitroso compounds such as -β-naphthylamine.

  The total amount of the vulcanizing agent, vulcanization accelerator, vulcanization acceleration aid and vulcanization retarder is preferably about 4 to 15 parts by weight with respect to 100 parts by weight of the base rubber. Examples of the antioxidant include imidazoles such as 2-mercaptobenzimidazole, phenyl-α-naphthylamine, N, N′-di-β-naphthyl-p-phenylenediamine, and N-phenyl-N′-isopropyl-p-. Examples thereof include amines such as phenylenediamine, and phenols such as di-t-butyl-p-cresol and styrenated phenol.

  The blending amount of the antioxidant is preferably about 1.5 to 5 parts by weight with respect to 100 parts by weight of the base rubber. Carbon black is mainly used as a reinforcing agent other than silica, and inorganic reinforcing agents such as silicate-based white carbon, zinc white, surface-treated precipitated calcium carbonate, magnesium carbonate, talc, clay, or the like. Organic reinforcing agents such as malon indene resin, phenol resin, and high styrene resin (styrene-butadiene copolymer having a high styrene content) can also be used.

Examples of the filler include calcium carbonate, clay, barium sulfate, and diatomaceous earth. The blending amount of the reinforcing agent and / or filler other than silica is preferably about 5 to 50 parts by weight with respect to 100 parts by weight of the base rubber. Examples of the softener include vegetable oil-based, mineral oil-based, and synthetic softeners such as fatty acids (stearic acid, lauric acid, etc.), cottonseed oil, tall oil, asphalt substances, and paraffin wax.
The blending amount of the softening agent is preferably about 10 to 100 parts by weight with respect to 100 parts by weight of the base rubber. Examples of the plasticizer include various plasticizers such as dibutyl phthalate, dioctyl phthalate, and tricresyl phosphate. As for the compounding quantity of a plasticizer, about 5-20 weight part is preferable with respect to 100 weight part of base rubber.
Furthermore, examples of the tackifier include coumarone / indene resin, aromatic resin, aromatic / aliphatic mixed resin, rosin resin, and cyclopentadiene resin. The compounding amount of the tackifier is preferably about 5 to 50 parts by weight with respect to 100 parts by weight of the base rubber.

  In addition to the above, for example, a dispersant, a solvent and the like may be appropriately blended in the rubber composition. The rubber composition is produced by kneading the above components using, for example, a closed kneader. The viscoelastic body is formed, for example, by molding the rubber composition into a sheet shape using a roller head extruder or the like, punching out the sheet so as to have a predetermined shape, and then cutting the punched sheet into a predetermined thickness. Thus, in a state where a plurality of sheets are laminated, they are manufactured by heating and vulcanization molding in a predetermined mold.

The vibration-damping brace 10 provided with the viscoelastic bodies 14, 17, 21b as described above is attached at both ends thereof to one constituent member of the skeleton through end fixing members (brackets) 4a, 5a, and When the rolling occurs in the building, the end fixing members 4a and 5a have a mounting structure that does not suppress the relative deformation angle between the columns 4 and 5 and the beams 2 and 3.
That is, first, the vibration-damping brace 10 includes a corner portion in which the lower beam 3 and the column 4 are joined in a frame surface surrounded by the upper beam 2, the lower beam 3, the column 4, and the interposition column 5 of the building framework 1. It is disposed obliquely along a diagonal line connecting the corners where the stud 5 and the upper beam 2 are joined.

The end fixing member 5 a is fixed to the side surface of the upper end portion of the intermediate column 5 with a predetermined gap S <b> 1 between the upper column 2 and the corner portion where the intermediate column 5 and the upper beam 2 are joined. In addition, at the corner where the column 4 and the lower beam 3 are joined, the end fixing member 4 a is fixed to the side surface of the lower end of the column 4 with a predetermined gap S 2 between the end fixing member 4 a and the lower beam 3.
And the upper end part of the damping brace 10 is attached to the end fixing member 5a by pin coupling, and the lower end part of the damping brace 10 is attached to the end fixing member 4a by pin coupling.

In such a vibration brace mounting structure, one end portion (upper end portion) of the vibration suppression brace 10 is attached to the upper end portion of the intermediate pillar 5 of the frame 1 via the end fixing member 5a, and the other end portion. The (lower end) is attached to the lower end of the column 4 of the skeleton 1 via the end fixing member 4a. For this reason, compared with the case where a vibration brace is attached with a gusset plate or the like fixed so as to straddle a column and a beam at the joint portion of the building frame 1 of the building, the strength of the joint portion of the frame body 1 is It will not be high.
Further, the end fixing members 5a and 4a to which the both ends of the vibration suppression brace 10 are attached are spaced from the other constituent members (upper beam 2 and lower beam 3) which are not fixed at the joint portion of the skeleton 1 with a clearance S1, S2 is opened and attached. For this reason, even when rolling occurs in the building due to rolling such as during an earthquake, the end fixing members 5a and 4a at both ends of the damping brace 10 do not suppress the relative displacement angle between the column and the beam. It has become.

Therefore, when a large horizontal force acts on the frame 1 due to rolling or the like during an earthquake, and the upper part (upper beam) of the frame 1 moves relative to the lower part (lower beam) horizontally, the frame 1 It is possible to suppress the bending of the constituent members and to apply a force in the compression or tension direction to the damping brace 10 more directly. That is, the rate at which the force acting on the frame 1 during an earthquake is absorbed by compressing or pulling the damping brace 10 is greater than the rate at which the force acting on the frame 1 is absorbed by the deflection of the constituent members of the frame 1. Thereby, the damping brace 10 can be functioned more effectively.
The end fixing members 5a and 4a are fixed to the upper end portion of the inter-column 5 and the lower end portion of the column 4, respectively. However, the end fixing member 5a is not limited to this and is fixed to the upper end portion of the inter-column 5 or the beam 2. The end fixing member 4 a may be fixed to the upper end of the column 4 or the beam 3.

Next, the function and effect of the vibration damping brace 10 will be described.
First, the state shown in FIG. 1 and FIG. 2A is a state in which no earthquake has occurred, and a predetermined gap S is provided between the brace members 10 a and 10 b constituting the vibration suppression brace 10. Further, the viscoelastic bodies 13, 14, 21b of the vibration suppression brace 10 are not deformed.

When a vibration is generated in the building due to an earthquake, the frame surface surrounded by the columns 4 and 5 and the beams 2 and 3 is deformed, so that a tensile or compressive force acts on the pair of brace members 10a and 10b. The brace members 10a and 10b reciprocate in the axial direction and vibrate so as to approach and separate in a direction perpendicular to the axial direction. Since the vibration is a small vibration with a relatively small amplitude and a short period at the initial stage of the vibration, the vibration is attenuated by the vibration damping means 13. That is, when a tensile or compressive force is applied to the pair of brace members 10a and 10b, as shown in FIG. 2 (b), the pair of connecting members 11 and 11 are pivoted to the brace members 10a and 10b.・ Rotate around fulcrum.
Since the connecting members 11 and 11 are pivotally connected to the pair of brace members 10a and 10b, respectively, by rotating with the pivoting position 12 as a fulcrum, the central portion of the pivoting positions 12 and 12 is entirely formed. Swing around as a fulcrum. Accordingly, the vibrations of the portions of the one connecting member 11 and the other connecting member 11 that are opposed to each other are amplified by the principle of leverage and are swung so as to rotate in opposite directions.
As a result, shear deformation occurs in the viscoelastic bodies 14 and 17, and the viscoelastic bodies 14 and 17 absorb vibration energy of the brace members 10 a and 10 b to suppress vibration.
In addition, since the deformation of the vibration damping means 13 connecting the opposing portions of the pair of connecting members 11 and 11 can be amplified, vibration energy can be absorbed from small deformation of the building frame, and the damping function (damping function) ) Can work effectively.

  And in the direction orthogonal to the axial direction of the brace material between the pivot position 12 where the connecting members 11 and 11 are connected to the brace materials 10a and 10b and the central portion 14a of the viscoelastic body 14 of the vibration damping means 13 Since the distance L in the axial direction of the brace material between the pivot position 12 and the central portion 14a of the viscoelastic body 14 is set to be longer than the distance l, each of the one connecting member 11 and the other connecting member 11 is set. The shake amplification effect of the facing part (tip part) is increased. Therefore, vibration energy can be absorbed more effectively from a small deformation of the building frame, and the damping function can be effectively used.

In addition, when the brace materials 10a and 10b are vibrated so that the brace materials 10a and 10b approach and separate from each other due to the compression or tensile force acting on the brace materials 10a and 10b, the width of the vibration increases and the brace materials 10a and 10b are applied to each other. When in contact, further vibrations between the brace members 10a and 10b are prevented. Therefore, the vibration control of the vibration having a relatively large amplitude and period thereafter can be smoothly transferred to the other vibration damping means 21.
When the vibration damping means 21 dampens, the brace materials 10a and 10b vibrate in the axial direction, so that the viscoelastic body 21b is sheared and absorbs the vibration energy of the brace materials 10a and 10b, thereby suppressing the vibration. Shake.

Moreover, in this Embodiment, since the front-end | tip part with which a pair of brace material 10a, 10b overlapped is made to pinch | interpose with a pair of connection attenuation | damping means 20, 20, the tension | pulling and compression force which act on a pair of brace material 10a, 10b Can reduce the vibration caused by
Further, since the vibration damping means 13 includes a viscoelastic body 14 and a pair of plates 15a and 15b coupled so as to sandwich the viscoelastic body 14, the vibration damping means 13 can be easily provided. Can be made into parts. And since one plate 15a of the vibration damping means 13 made into a part is coupled to one connecting member 11, and the other plate 15b is coupled to the other connecting member 11, the vibration damping means 13 can be easily operated. The vibration brace 10 can be incorporated. Further, the vibration damping means 13 can be easily replaced or repaired.

Further, since the one plate 15a of the vibration damping means 13 and the one connecting member 11 are coupled via the second viscoelastic body 17, the vibration can be attenuated more effectively. In addition, a step is generated between the one plate 15a and the one connecting member 11. Since the second viscoelastic body 17 is disposed at the step, the one plate 15a and the one connecting member are disposed. 11 can be easily and reliably connected.
In addition, the viscoelastic bodies 14, 17, and 21b add 100 to 150 parts by weight of silica to 100 parts by weight of the base rubber having a C—C bond in the main chain, and 10 to 10 parts of the silane compound with respect to the silica. Since it is a high damping rubber blended with 30% by weight, the viscoelastic bodies 14, 17, 21b can have appropriate strain dependency, frequency dependency, and temperature dependency. Can be fully exhibited.

(Second Embodiment)
FIG. 8 is for explaining the second embodiment.
The present embodiment is different from the first embodiment in the connection structure between the pair of brace members 10a and 10b constituting the vibration suppression brace 10. Therefore, this point will be described below. The same reference numerals are given to the common parts with the embodiment, and the description is simplified or omitted.

  In the present embodiment, extending portions 30a and 30b are integrally formed at the tip portions of the pair of brace members 10a and 10b facing each other. The extending portions 30a and 30b are formed to be sufficiently thinner in the horizontal direction in FIG. 8 than the braces 10a and 10b, and forward from the central portion (horizontal central portion) of the front end surfaces of the braces 10a and 10b. It is extended and formed. The extending portions 30a and 30b overlap in the vertical direction, and their side surfaces are flush with each other.

The overlapping portions of the extending portions 30a and 30b are connected by connecting members 31 and 31, respectively. The connecting members 31 and 31 are connected to the extending portions 30a and 30b at two positions spaced apart in the axial direction of the extending portions 30a and 30b, respectively. In FIG. 8, holes 31a and 31a and holes 31b and 31b are formed in the connecting member 31, but bolts (not shown) are inserted into the holes 31a and 31a and the holes 31b and 31b, respectively, and these are extended portions 30a and 30b. The portions where the extending portions 30a and 30b overlap are connected by connecting members 31 and 31 at two locations spaced apart in the axial direction of the extending portion, respectively. The pair of connecting members 31 and 31 are pivotally connected to the pair of extending portions 30a and 30b, respectively, by the bolts.
Further, the pair of connecting members 31, 31 are connected by vibration damping means 32. The vibration attenuating means 32 is a viscoelastic body 32, and the pair of connecting members 31, 31 are vibrated by bonding the opposing surfaces of the viscoelastic body 32 to the opposing surfaces of the connecting members 31, 31, respectively. The damping means 32 is connected. Furthermore, one connecting member 31 and one extending portion 30 a are connected by a second viscoelastic body 33.
The pair of extending portions 30a and 30b are connected in a state of being sandwiched between the connecting members 31 and 31 and the viscoelastic bodies 32 and 33 from both sides thereof.

According to the present embodiment, the same effects as those of the first embodiment can be obtained, and the extension portions 30a and 30b thinner than the pair of braces 10a and 10b constituting the vibration suppression brace 10 can be provided. Since these extending portions 30a and 30b are connected by the connecting members 31 and 31 and the viscoelastic bodies 32 and 33, the thickness of the connecting portion between the pair of brace members 10a and 10b constituting the vibration suppression brace 10 is formed. Can be made thinner than in the first embodiment.
Therefore, the vibration-damping brace 10 can be easily accommodated in the wall constituting the frame surface surrounded by the columns and beams.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 illustrates a first embodiment of the present invention, and is a side view illustrating an example of a vibration control structure including a vibration control brace. It is a figure which shows typically the principal part of a damping structure. It is a side view which shows the principal part of a vibration damping structure. FIG. 4 is a cross-sectional view taken along line AA in FIG. It is sectional drawing of a vibration damping means. 2 is a plan view of the vibration damping means. FIG. It is a figure which shows the hysteresis loop at the time of performing the sine wave excitation which produces the shear deformation of a viscoelastic body. The 2nd Embodiment of this invention is shown, and is a perspective view which shows the principal part of a damping structure. It is a figure for demonstrating the shear strain rate (gamma) of a viscoelastic body.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Frame 2 Upper beam 3 Lower beam 4 Column 5 Space column 10 Damping brace 10a, 10b Brace material 11, 31b Connection member 12 Pivoting position 13 Vibration damping means 14, 32 Viscoelastic body 15a, 15 Plate 17, 33 2nd Viscoelastic body 20 connection damping means 21 other vibration damping means 21b viscoelastic body

Claims (8)

A vibration-damping brace provided obliquely in a frame surface surrounded by columns and beams,
A pair of brace members arranged in parallel with each other at a predetermined interval and with the tip portions being stacked in a direction perpendicular to the axial direction;
A pair of connecting members that connect the tip portions of the pair of brace materials that overlap each other at two locations spaced apart in the axial direction of the brace material;
The pair of connecting members are pivotally connected to the pair of brace members, respectively, and opposing portions are connected by vibration damping means. In the vibration-damping brace according to claim 1,
The pair of coupling members and the vibration damping means constitute a coupling damping means,
The connection damping means is provided in a pair so as to sandwich the pair of brace members from the side surface side with the overlapping end portions thereof overlapped. In the vibration-damping brace according to claim 2,
The vibration damping means includes a viscoelastic body and a pair of plates coupled so as to sandwich the viscoelastic body.
One of the plates is coupled to the one connecting member, and the other plate is coupled to the other connecting member. In the vibration damping brace according to claim 3,
At least one plate and one connecting member are coupled to each other via a second viscoelastic body. In the vibration-damping brace according to claim 3 or 4,
In the viscoelastic body, 100 to 150 parts by weight of silica is added to 100 parts by weight of a base rubber having a C—C bond in the main chain, and 10 to 30% by weight of a silane compound is added to the silica. Damping brace characterized by In the vibration-damping brace according to any one of claims 1 to 5,
When the position where the connecting member is connected to the brace material is a pivot position,
From the distance in the direction perpendicular to the axial direction of the brace material between the pivot position and the central portion of the vibration damping means, the brace material between the pivot position and the central portion of the vibration damping means is Damping brace characterized by long distance in the axial direction. In the vibration-damping brace according to any one of claims 1 to 6,
A vibration damping brace characterized in that the brace material is provided with other vibration damping means having a damping performance different from that of the vibration damping means. In the vibration damping structure in which the vibration bracing according to any one of claims 1 to 7 is provided obliquely in a frame surface surrounded by columns and beams constituting the building framework,
When the both ends of the vibration-damping brace are attached to one constituent member of the frame body via the end fixing member and the roll is generated in the building with respect to the structural member constituting the frame body, A vibration damping structure, wherein the end fixing member has a mounting structure that does not suppress a relative deformation angle between the column and the beam.

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