JP2006090486A - Visco-elastic damper - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a visco-elastic damper capable of coping with displacement of any direction and type of two members intersecting with each other such as a pillar 1 and a beam 2 when being vibrated in earthquake or the like, and surely exercising its damping function at all times regardless of direction and type of the displacement. <P>SOLUTION: Arms 7, 8 are rotatably journaled to two members 1, 2 intersecting with each other, and further the arms 7, 8 are rotatably connected through a visco-elastic body. Face members 9, 10, or a cylindrical body 15 and a shaft body 16 are fixed to the arms 7, 8, and the visco-elastic body may be mounted therebetween. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a viscoelastic damper as a vibration control device for a building or a structure, and in particular, is installed at a joint portion between two members such as a column and a beam, and relative to both members due to vibration. The present invention relates to a viscoelastic damper that suppresses general displacement.

  Conventionally, viscoelastic dampers are often used as seismic structures for buildings and structures. Especially, as a seismic reinforcement member for columns and beams in wooden houses, for example, Japanese Unexamined Patent Publication No. 2000-160683 And those described in Japanese Patent Application Laid-Open No. 2001-295506 and the like.

  FIG. 1 shows an example of Japanese Patent Laid-Open No. 2000-160683, in which surface members 3 and 4 are fixed to a column 1 and a beam 2 respectively, and a viscoelastic body 5 is sandwiched between the surface members 3 and 4. It is a thing. When a relative displacement occurs between the column 1 and the beam 2 due to an earthquake or the like, the viscoelastic body 5 sandwiched between the surface members 3 and 4 is deformed, and vibration energy is absorbed by the viscosity of the viscoelastic body 5. At the same time, the deformation is restored by elasticity, resulting in a vibration control effect.

  However, in this structure, the surface members 3 and 4 are always at positions indicated by solid lines and broken lines in FIG. 2, and when the beam 2 vibrates in the horizontal direction with respect to the column 1, the surface member 4 is a chain line with respect to the surface member 3. When the beam 2 is tilted with respect to the column 1, the surface member 4 is rotated with respect to the surface member 3 as indicated by a chain line b, while only being displaced in the horizontal direction as indicated by a. A displacement occurs, and the direction and magnitude of deformation applied to the viscoelastic body 5 change in a complicated manner depending on the form of displacement between the surface member 3 and the surface member 4.

  Therefore, the deformation that occurs in the viscoelastic body 5 changes in a complex manner depending on the direction, form, and size of the relative displacement between the beam 2 and the column 1, and vibrations caused by the viscoelastic body 5 are designed in designing this viscoelastic damper. It is extremely difficult to calculate the magnitude of resistance to the load and the restoring force, and it is difficult to design an optimal damper according to the structure of the building.

In addition, in Japanese Patent Laid-Open No. 2001-295506, the surface members 3 and 4 are fastened with bolts, and the surface members 3 and 4 can only rotate. Since 3 and 4 are fixed to the column 1 and the beam 2, respectively, it is effective only when the column 1 and the beam 2 are rotated about the bolt as a rotation center during vibration. When vibration such as the above occurs, there is a possibility that the viscoelastic damper does not function.
JP 2000-160683 A JP 2001-295506 A

  The present invention has been made in view of such circumstances, and when two members that intersect each other such as the pillar 1 and the beam 2 vibrate due to an earthquake or the like, they correspond to displacements in all directions and forms of the both members. It is an object of the present invention to provide a viscoelastic damper capable of exhibiting a vibration control function without fail regardless of the direction or form of the displacement.

  Thus, the viscoelastic damper according to the present invention is configured such that the arms are pivotally supported by two members intersecting each other, and the arms are rotatably coupled via the viscoelastic body. It is a feature.

  In the present invention, surface members parallel to each other are fixed to the two arms, the viscoelastic body is sandwiched between the surface members, and the surface members are pivotally supported by a rotation shaft. can do.

  In this structure, a plurality of surface members are provided on at least one of the arms, a surface member provided on the other arm is disposed between the plurality of surface members, and the viscoelastic body is disposed between the surface members. It can be clamped.

  Further, as another form of the viscoelastic damper of the present invention, a shaft body orthogonal to the arm is fixed to the one arm, and a cylindrical body loosely fitted to the shaft body is fixed to the other arm. A viscoelastic body may be disposed within the space between the cylindrical body and the shaft body.

  As still another embodiment of the present invention, a shaft body orthogonal to the one arm is fixed to the one arm, a cylindrical body loosely fitted to the shaft body is fixed to the other arm, and the surface of the shaft body and the It is also possible to form a compression wall extending substantially in the radial direction on the inner surface of the cylindrical body and arrange a viscoelastic body between the compression walls. In this embodiment, it is preferable that the viscoelastic body is formed by superposing a relatively hard viscoelastic body and a relatively soft viscoelastic body in the compression direction.

  In the present invention, the viscoelastic body sandwiches unvulcanized rubber between the arms, between the face members, or between the cylindrical body and the shaft body, and heats and pressurizes this to vulcanize the unvulcanized rubber. In addition, the arm, the surface member, the cylindrical body, and the shaft body can be vulcanized and bonded.

  The viscoelastic body in the present invention is formed by molding a viscoelastic material into a predetermined shape, and is attached to the arm, the surface member, the cylinder, the shaft body, or the compression wall. be able to. Further, as the viscoelastic body, a polymer material having fluidity may be filled in a predetermined place and cured.

  According to the present invention, the arm is pivotally supported by two members intersecting each other, and the arms are rotatably coupled to each other, and a viscoelastic body is interposed between the joints of the two arms. Therefore, when there is a relative displacement between the two members, all of them are concentrated in the rotation between the arms regardless of the form, direction and size of the displacement, and the viscosity associated with the change in the angle of the arm. Appears as an elastic deformation.

  Therefore, no matter how the two members are displaced relative to each other, if the change in the distance between the rotation centers of both arms with respect to the displacement is known, the rotation angle between the arms can be calculated. It is possible to easily calculate the magnitude of the deformation resistance and the restoring force of the viscoelastic body accompanying the rotation, and to design an optimal viscoelastic damper for a building or the like.

  Embodiments of the present invention will be described below with reference to the drawings. FIGS. 3 and 4 (a) show one embodiment of the viscoelastic damper 6 of the present invention. The two members intersecting each other such as the pillar 1 and the beam 2 of the wooden building are respectively provided with arms 7, 8 is rotatably supported by pins 13 and 14.

  Surface members 9 and 10 are fixed to the ends of the arms 7 and 8, respectively. The surface members 9 and 10 have a viscoelastic body 11 sandwiched between them and are pivotable by a pivot shaft 12. It is supported.

  Thus, when a relative displacement occurs between the column 1 and the beam 2 due to vibration such as an earthquake, for example, when the column 1 tilts to the left with respect to the beam 2 as shown by a solid line in FIG. 3, the distance between the pins 13 and 14 increases from a in FIG. 3 to b in FIG. 5. On the contrary, when tilted to the right, the distance between the pins 13 and 14 decreases as indicated by a chain line as c. As a result, relative rotation about the rotation shaft 12 occurs between the arms 7 and 8, and the viscoelastic body 11 becomes resistance to the rotation, and a reinforcing effect is generated.

  At this time, if the relative displacement between the column 1 and the beam 2 is caused by the tilting of the column 1 as shown in FIG. The change of the space | interval of the pins 13 and 14 arises there, and it will be collected by the rotational motion centering on the rotational axis 12 between the surface members 9 and 10 accompanying it. At this time, since the position of the rotating shaft 12 is not fixed, it can move freely as shown in FIG.

  Therefore, regardless of the displacement form and direction of the column 1 and the beam 2, if the distance between the pins 13 and 14 changes, the accompanying rotation angle of the surface members 9 and 10 can be known, and the accompanying viscoelastic body 11 The deformation can be calculated, and the resistance of the viscoelastic body 11 to the displacement between the column 1 and the beam 2 and the magnitude of the reinforcing effect can be easily calculated. Therefore, the optimum viscoelastic damper 6 can always be designed and used.

  In FIG. 4A, the single surface members 9 and 10 are provided for the pillar 1 and the beam 2 respectively, but the present invention is not limited to this, and a plurality of surface members 9 and 10 are provided. 10 can also be provided.

  In FIG. 4B, two surface members 10 are provided on the beam 2 via the arms 8, and the surface member 9 provided on the pillar 1 is disposed between the two surface members 10. Viscoelastic bodies 11 are sandwiched between the member 9 and the surface members 10 on both sides thereof.

  FIG. 4C shows still another example, in which two surface members 9 and 10 are provided on the column 1 and the beam 2 via the arms 7 and 8 respectively, and these surface members 9 and 10 are alternately arranged. The viscoelastic bodies 11 are sandwiched between the surface members 9 and the surface members 10, respectively.

  In these examples, as the number of the surface members 9 and 10 increases, the reinforcing effect against the displacement between the column 1 and the beam 2 increases, and the number of the surface members 9 and 10 is further increased depending on the structure of the building or the structure. It goes without saying that it is possible.

  FIG. 6 shows another embodiment of the viscoelastic damper 6 according to the present invention. A shaft body 16 orthogonal to the arm 7 is fixed to an arm 7 pivotally supported on a column 1 by a pin 13. A cylindrical body 15 that is orthogonal to the arm 8 is fixed to the arm 8 that is pivotally supported by a pin 14. The cylindrical body 15 and the shaft body 16 are loosely fitted with an interval, and an annular viscoelastic body 17 is disposed within the interval.

  FIG. 7 shows a modification of the viscoelastic damper 6, in which shaft bodies 16 and 16 are fixed to both sides of the arm 7 pivotally supported by the column 1, and a pair of arms pivotally supported by the beam 2. The cylinders 15 and 15 are fixed to the cylinders 8 and 8, respectively. The cylinders 15 and 15 are loosely fitted to the shaft bodies 16 and 16 respectively, and the cylinders 15 and 15 are connected to the shaft bodies 16 and 16 respectively. The viscoelastic bodies 17 and 17 are arranged in the interval with the 16.

  Thus, in these forms, when a relative displacement occurs between the column 1 and the beam 2 due to vibration such as an earthquake and the distance between the pins 13 and 14 changes, the arms 7 and 8 are moved accordingly. Relative rotation occurs between the cylindrical body 15 and the shaft body 16 therethrough, and a shearing force acts on the viscoelastic body 17 disposed between the cylindrical body 15 and the shaft body 16, On the other hand, the viscoelastic body 17 becomes a resistance and produces a reinforcing effect.

  FIG. 8 shows still another embodiment of the present invention, in which a cylindrical body 20 is fixed to an arm 7 pivotally supported on a column 1 and provided on a pair of arms 8 pivotally supported on a beam 2. A shaft body 21 is fixed between the flanges 18. The shaft body 21 is loosely fitted in the cylinder body 20, and compression walls 22 and 23 extending in the radial direction of the cylinder body 20 and the shaft body 21 are formed on the inner surface of the cylinder body 20 and the outer surface of the shaft body 21, respectively. ing.

  In this example, as the compression walls 22 and 23, the plate body protruding from the inner surface of the cylindrical body 20 is the compression wall 22, and the inclined surface of the weight shaft 21 is the compression wall 23. However, the shape is not limited to this. The space between the compression walls 22 and 23 may be changed to be large or small by the relative rotation of the cylindrical body 20 and the shaft body 21.

  Thus, a substantially fan-shaped viscoelastic body 24 is disposed in a space surrounded by the compression wall 22 of the cylindrical body 20, the compression wall 23 of the shaft body 21, and the inner surface of the cylindrical body 20. The viscoelastic body 24 is preferably fixed only to one of the compression walls 22 and 23.

  Thus, in this example, when the cylindrical body 20 and the shaft body 21 rotate relatively, one of the viscoelastic bodies 24 sandwiched between the compression walls 22 and 23 is compressed, and the compression force is It becomes a resistance to rotation and produces a reinforcing effect.

  When the viscoelastic body 24 to be compressed is different depending on the direction of rotation of the cylindrical body 20 and the shaft body 21 and is alternately rotated in both directions by vibration, both the viscoelastic bodies 24 are alternately compressed, It is reinforced against vibrations. The uncompressed viscoelastic body 24 recovers its previously compressed deformation while rotating in the opposite direction.

  FIG. 9 and FIG. 10 show still another embodiment. The viscoelastic body 24 in FIG. 8 includes a viscoelastic body 24a that is relatively hard and difficult to compress, and a viscoelastic body 24b that is relatively soft and easy to compress. , And are formed so as to overlap in the compression direction.

  Thus, when the cylinder 20 and the shaft 21 are relatively rotated, a compressive force is applied to the viscoelastic body 24 as in FIG. 8, which becomes a resistance to deformation. At this time, for a relatively small-scale vibration due to a small earthquake, wind and rain, traffic vibration or the like, the soft viscoelastic body 24b is deformed as shown in FIG.

  On the other hand, when the cylindrical body 20 and the shaft body 21 are rotated beyond the limit where the viscoelastic body 24b is compressed due to a large-scale earthquake or the like, the viscoelastic body 24b is shown in FIG. As well as being compressed to the limit, the rigid viscoelastic body 24a is also compressed, resulting in a greater resistance to vibration and a greater reinforcing effect.

  As described above, according to the present invention, when relative displacement occurs in the members 1 and 2 that intersect each other due to vibration, the pin 13 that pivotally supports the arms 7 and 8 regardless of the form and direction of the displacement. , 14 is changed, and the change is an angle change of the arms 7, 8, and the arms 7, 18 or the surface members 9, 10, fixed to them, the cylindrical body 15 and the shaft body 16, and the cylindrical body It appears as a relative rotation between the shaft 20 and the shaft body 21, and the viscoelastic bodies 11, 17, 24 become resistance to the rotation.

  Therefore, if the maximum amount of change in the distance between the pins 13 and 14 is known, the accompanying rotation angle of the arms 7 and 8 can be determined, and the magnitude of the resistance to rotation by the viscoelastic body can be obtained. The viscoelastic damper 6 can be easily designed, and the vibration control effect as designed can be expected.

  The viscoelastic bodies 11, 17, and 24 according to the present invention are formed by molding a viscoelastic material into a predetermined shape according to the installation location, and forming them into the arms 7 and 8, the surface members 9 and 10, and a cylindrical body. 15 and the shaft body 16 or the compression walls 22 and 23 can be installed by sticking to predetermined places.

  In addition, as another means for installing the viscoelastic bodies 11, 17, and 24 in the present invention, a predetermined position where the viscoelastic bodies 11, 17, and 24 are to be installed is filled with a fluid polymer material, By curing this, the viscoelastic bodies 11, 17, and 24 can be formed at the locations.

  In the above description, the viscoelastic viscoelastic damper 6 of the present invention has been described mainly as a vibration control device installed between the pillar 1 and the beam 2 in the wooden building, but its application is limited to this. It can also be installed between beams that cross each other, and can also be used as a vibration control device in various structures such as a reinforced concrete building or a bridge fall prevention device.

The conventional viscoelastic damper is shown, Comprising: (a) is a side view, (b) is a front view. Side view showing the behavior of the viscoelastic damper of FIG. 1 during vibration The side view which shows one form of the viscoelastic damper of this invention FIG. 4 is a cross-sectional view taken along the line IV-IV of the viscoelastic damper of FIG. 3, and (a), (b), and (c) each show an example in which the number of surface members is different. The side view which shows the behavior at the time of vibration in the viscoelastic damper of FIG. The other form of the viscoelastic damper of this invention is shown, Comprising: (a) is aa sectional drawing in (b), (b) is bb sectional drawing in (a). FIG. 7 shows a modification of the viscoelastic damper of FIG. 6, wherein (a) is a cross-sectional view taken along line aa in (b), and (b) is a cross-sectional view taken along line bb in (a). The further another form of the viscoelastic damper of this invention is shown, Comprising: (a) is aa sectional drawing in (b), (b) is bb sectional drawing in (a). Sectional drawing equivalent to (a) which shows the modification of the viscoelastic damper of FIG. FIG. 10 is a cross-sectional view illustrating the behavior of the viscoelastic damper of FIG. 9 during vibration, where (a) illustrates a small-scale vibration and (b) illustrates a large-scale vibration.

Explanation of symbols

1 Member (pillar)
2 Member (beam)
6 Viscoelastic damper 7, 8 Arm 9, 10 Surface member 11, 17, 24 Viscoelastic body 12 Rotating shaft 15 Cylindrical body 16 Shaft body 20 Cylindrical body 21 Shaft body 22, 23 Compression wall 24 a Hard viscoelastic body 24 b Soft viscous body Elastic body

Claims (9)

The arms (7, 8) are pivotally supported by two members (1, 2) intersecting with each other, and the arms (7, 8) are connected to each other via viscoelastic bodies (11, 17, 24). The viscoelastic damper is characterized in that the viscoelastic damper The plane members (9, 10) parallel to each other are fixed to the two arms (7, 8), the viscoelastic body (11) is sandwiched between the plane members (9, 10), and the plane member (9 , 10) are viscoelastic dampers according to claim 1, characterized in that they are pivotally supported by a pivot shaft (12). A plurality of surface members (9, 10) are provided on at least one of the arms (7, 8), and a surface member (9, 10) provided on the other arm (7, 8) is replaced with the plurality of surface members (9 , 10), and the viscoelastic body (11) is sandwiched between the face members (9, 10). The viscoelastic damper according to claim 2, A cylindrical body (15) fixed to the one arm (8) with a shaft (16) orthogonal to the arm (8) and loosely fitted to the other arm (7) with a space from the shaft (16). The viscoelastic damper according to claim 1, wherein the viscoelastic body (17) is disposed within a space between the cylindrical body (15) and the shaft body (16). A shaft body (21) orthogonal to the arm (7, 8) is fixed to the one arm (8), and a cylindrical body (20) is loosely fitted to the shaft body (21) to the other arm (7). A compression wall (22, 23) extending in a substantially radial direction is formed on the surface of the shaft body (21) and the inner surface of the cylinder body (20), respectively, and a sticky wall is formed between the compression walls (22, 23). The viscoelastic damper according to claim 1, wherein an elastic body (24) is arranged. The viscoelastic body (24) is obtained by superimposing a relatively hard viscoelastic body (24a) and a relatively soft viscoelastic body (24b) in the compression direction thereof. Viscoelastic damper described in The viscoelastic body (11, 17) holds unvulcanized rubber between the arms (7, 8), between the surface members (9, 10) or between the cylindrical body (15) and the shaft body (16). This is heated and pressurized to vulcanize the unvulcanized rubber, and vulcanized and bonded to the arms (7, 8), the face members (9, 10) or the cylindrical body (15) and the shaft body (16). The viscoelastic damper according to claim 1, 2, 3, or 4, wherein The viscoelastic body (11, 17, 24) is formed by molding a viscoelastic material into a predetermined shape, and includes the arm (7, 8), the surface member (9, 10), and the cylindrical body (15). ) And a shaft body (16) or a compression wall (22, 23), viscoelastic damper according to claim 1, 2, 3, 4, 5 or 6 The viscoelastic body (11, 17, 24) is obtained by filling a predetermined portion with a polymer material having fluidity and curing it. The viscoelastic damper according to 4, 5 or 6

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