JP3836122B1 - Joint structure of structural materials and spring / viscoelastic composite damper - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a joint structure and a damper which are compact and can obtain a large restoring force and damping property.
SOLUTION: A spring / viscoelastic composite damper 1 is configured by sandwiching a sheet-like viscoelastic material 3 between a curved leaf spring member 2 and a pressing member 4. This is attached to the inner corner side of the joint portion between the structural members such as the columns 11 and beams 12 so as to be convex with respect to the joint portion. The spring / viscoelastic composite damper 1 is attached to the structural material by fixing both ends of the leaf spring member 2 with bolts 7 or the like. When a rotational deformation occurs in the joint portion of the structural material due to an earthquake or wind, the leaf spring member 2 is elastically deformed and a restoring force as a spring is generated. Moreover, a direct strain and a shear strain are generated in the viscoelastic material 3, and a damping force is generated for both. At the time of large deformation, a hysteresis damping force due to plastic deformation of the leaf spring member 2 is further obtained.
[Selection] Figure 1

Description

  The present invention relates to a joint structure of a structural material and a spring / viscoelastic material composite damper used for the joint, and is mainly applied to a middle- and low-rise steel column / beam frame. However, the present invention is not limited to this, and the present invention can also be applied to structures such as wooden buildings, mixed structures, and garden houses. It can also be applied to both new buildings and existing buildings.

  Conventionally, as a damper installed in a joint portion of a structure, a sheet-like viscoelastic material sandwiched between two steel plates is known (see, for example, Patent Document 1).

  Further, in Patent Document 2, a leaf spring or a laminated leaf spring is attached to a joint portion of a building, and the reinforcement is made such that deformation of the frame structural members due to an earthquake or a large wind is mainly reduced by the restoring force of the leaf spring. The structure is described.

  Furthermore, Patent Document 3 describes a structure in which a metal member is provided for connecting the leaf springs to provide a proof stress in a space between leaf springs of the laminated leaf springs attached to the joint portion.

  In addition to this, in Patent Document 4, a friction plate is interposed at each rotatable joint between a pair of link arms and a bracket for attaching the link arm to a structural material as a seismic component for a building installed at a joint. And a damping force is given to the vibration of the building.

JP 2005-220614 A JP 2003-096911 A JP 2005-350937 A Japanese Patent No. 3470807

  The invention described in Patent Document 1 is easy to handle and is particularly suitable as a damper for vibration control in a wooden building. However, when the force received from a structure to be applied such as a low-rise steel structure increases, the required damper The size of this will increase, making it difficult to fit.

  The invention described in Patent Document 2 mainly expects a restoring force, but as described in Patent Document 3 by the same applicant, there is a restoring force and a damping effect for following the deformation of the joint. It is insufficient. Patent Document 3 is intended to improve the structure, but for example, a ring-shaped metal member is deformed in the space between the leaf springs of the laminated leaf springs, and it is difficult to say that the shape is structurally stable. It is difficult to design for the target structure.

  The thing of patent document 4 is trying to solve the problem of the earthquake-resistant structure using a leaf | plate spring, but the weight of an apparatus becomes large, and the frictional resistance between a link arm, a bracket, and a friction board is utilized. In practice, there is a problem that it is difficult to adjust and maintain the damping force.

  The present invention has been made to solve the above-described problems in the prior art, and an object thereof is to provide a joint structure and a damper that are compact and can provide a large restoring force and damping property.

  The joint structure of the structural material according to claim 1 of the present application is curved on the inner corner side of the joint between the structural materials so as to be convex with respect to the joint, and both ends are joined to one of the structural materials. A leaf spring member, a sheet-like viscoelastic material having a required thickness attached to the curved portion inner peripheral surface side of the plate spring member, and a curved portion inner peripheral surface side of the viscoelastic material, In the deformation range, it consists of a pressing member that can be regarded as a substantially rigid body, and absorbs vibration energy by deformation of the leaf spring member and deformation of the viscoelastic material sandwiched between the leaf spring member and the pressing member. The spring / viscoelastic material composite type damper is installed.

  The damper in the present invention is a spring / viscoelastic material composite type damper in which a sheet-like viscoelastic material is sandwiched between a curved leaf spring member and a holding member, and this is the inner angle side of the joint between structural materials. Attach so that it is convex to the joint. The damper can be attached to the structural member by fixing both end portions of the leaf spring member to one of the structural members joined to each other with a bolt or any other attachment means.

  When a rotational deformation occurs in the joint portion of the structural material due to an earthquake or wind, the leaf spring member is deformed in a manner that changes the curvature of the curved portion in the composition plane, and a restoring force as a spring is generated. At this time, the presser member has rigidity that can be regarded as a substantially rigid body within the deformation range of the leaf spring member, so that direct strain and shear strain are generated in the sheet-like viscoelastic material sandwiched therebetween. A damping force is generated by both of them, and the vibration of the structure is attenuated.

  Further, at the time of large deformation, a hysteresis damping force due to plastic deformation of the leaf spring member can be obtained, and the vibration of the structure can be effectively attenuated, and damage and damage to the structure such as a building can be suppressed.

  The present invention is mainly directed to a joint between a column and a beam as a structural material. However, the present invention is not limited to this. For example, the present invention can be applied to a joint between beams having a horizontal surface.

  According to a second aspect of the present invention, in the joint structure of the structural material according to the first aspect, the structural materials are substantially pinned or semi-rigidly joined at the joint.

  Since the joint structure of the present invention absorbs vibration energy by utilizing the deformation of the joint part between the structural materials, the joint part between the structural materials is positively rotated, such as a pin joint. By allowing it, the shaking of the building due to a large earthquake or the like can be attenuated more effectively.

  A spring / viscoelastic material composite damper according to claim 3 of the present application includes a leaf spring member curved in a convex shape, and a sheet-like viscoelasticity of a required thickness attached to the curved portion inner peripheral surface side of the leaf spring member. And a pressing member that is attached to the inner peripheral surface side of the curved portion of the viscoelastic material and can be regarded as a substantially rigid body in the deformation range of the leaf spring member, and the deformation of the leaf spring member and the leaf spring The vibration energy is absorbed by the deformation of the viscoelastic material sandwiched between the member and the pressing member.

  The function as a damper is as described for claim 1.

  As the viscoelastic material, for example, a thermoplastic viscoelastic material described in detail in Patent Document 1 can be used. However, while Patent Document 1 uses energy absorption for shear deformation of a sheet-like viscoelastic material sandwiched between flat metal plates, in the present invention, both direct strain and shear strain are used as described above. Energy absorption by.

  Thermoplastic viscoelastic materials include styrene-isoprene block copolymers having a high vinyl content, hydrogenated products thereof, polymer blocks mainly composed of isobutylene and polymer blocks not mainly composed of isobutylene. Examples thereof include thermoplastic block copolymers such as block copolymers, specifically styrene-isobutylene-styrene triblock copolymers.

  In addition, a composition using at least one selected from unvulcanized rubber rubbers such as natural rubber, isoprene rubber, butylene rubber, SBR, NBR, EPDM, polyurethane, silicone rubber, butadiene rubber, chloroprene rubber and the like may be used. . A thermoplastic thermoplastic block copolymer and unvulcanized rubber may be used in combination.

  In such a thermoplastic viscoelastic material, an additive or a filler is added as necessary to adjust the characteristics to obtain a more preferable viscoelastic body. Examples of the additive include tackifier resins, plasticizers, stabilizers, pigments, lubricants, flame retardants, and the like.

  Since the pressing member is a member that sandwiches the sheet-like viscoelastic material together with the leaf spring member, the surface in contact with the viscoelastic material needs to be bent with the same or substantially the same curvature as the leaf spring member. In order to give rigidity that can be regarded as a substantially rigid body within the deformation range of the leaf spring member, a necessary rigidity is obtained while suppressing weight by providing a stiffening rib or the like on a curved plate material such as a steel plate. be able to. In addition, other metals or hard synthetic resins may be used as long as necessary rigidity can be obtained.

  According to a fourth aspect of the present invention, in the spring / viscoelastic composite damper according to the third aspect, the leaf spring member, the viscoelastic material, the viscoelastic material, and the pressing member are bonded to each other. It is.

  An adhesive may be used for the bonding surface, but in the case of a thermoplastic viscoelastic material, it can also be bonded by applying heat during production. The adhesive surface is preferably subjected to a surface treatment for increasing the adhesive force, and examples thereof include a shot blast treatment, an adhesive treatment, and a plasma treatment. Two or more surface treatments may be used in combination.

  In addition, the leaf spring member, viscoelastic material, and holding member can be integrated only by adhesive force. However, when the size is increased and the weight of the holding member increases, it can be slid with a combination of long holes and bolts, for example. It is also conceivable to couple the plate spring members in such a manner as to restrain the deformation of the leaf spring members as much as possible.

  According to a fifth aspect of the present invention, in the spring / viscoelastic composite damper according to the third aspect, the leaf spring member is formed by bending a steel material having a required thickness.

  The steel material is not limited to spring steel and is not particularly limited as long as necessary restoring force characteristics can be obtained.

  The spring / viscoelastic material composite damper in the present invention utilizes the restoring force of the leaf spring member and the damping force generated along with the direct strain and shear strain of the sheet-like viscoelastic material sandwiched therebetween, The hysteresis damping force due to plastic deformation of the leaf spring member is also used at the time of large deformation, and a large structure provides a large earthquake resistance and vibration control effect.

  Since it has a compact structure, it can be easily installed, removed, replaced, reused, etc., and can be used in new buildings and existing buildings.

  In addition, the joints between the structural members are substantially pin-jointed, which is also effective for medium- and low-rise steel columns and beam frames.

  FIG. 1 shows an embodiment in which the present invention is applied to a low-rise steel structure building, and FIG. 2 shows a specific shape of a combined spring / viscoelastic damper 1 used in the embodiment of FIG. It is shown.

  FIG. 1 (a) shows the position of one pillar. In the figure, the spring / viscoelastic composite damper of the present invention is provided on the top and bottom and right and left of the joint between the pillar 11 and the beam 12 and on the left and right of the bottom end of the pillar 11. 1 is attached so as to be convex with respect to the joint. The column beam joint 13 and the column bottom joint 14 are not rigid joints, but are semi-rigid joints close to pin joints. (b) shows the form as a dynamic model. (C) is a case where the end of the beam 12 is joined to the joining plate 13a attached to the column 11 with a single bolt as a pin so as to be substantially pin joined.

  The spring / viscoelastic material composite damper 1 shown in FIG. 2 has a sheet-like shape between a leaf spring member 2 curved in a quarter circle and a presser member 4 similarly curved in a quarter circle. A viscoelastic material 3 is bonded and sandwiched, and bolts 5 formed in both ends of the leaf spring member 2 are used to attach bolts 7 to structural materials such as columns 11 and beams 12 as shown in FIG. It can be attached with.

  Although the leaf spring member 2 and the presser member 4 can be made of steel, the plate spring member 2 is required to be deformed as a spring, whereas the presser member 4 stiffens with a crescent-shaped stiffening rib 6. Thus, the leaf spring member 2 is not substantially deformed within the deformation range.

  Since the beam-to-column joint 13 and the column lower-end joint 14 are substantially pinned or semi-rigid, when the building is shaken by an earthquake or wind, the beam-to-column joint 13 and the column lower-end joint 14 are relatively rotated. And the leaf spring member 2 of the spring / viscoelastic composite damper 1 is alternately deformed in the closing direction and the expanding direction.

  On the other hand, since the pressing member 4 is not substantially deformed, the viscoelastic material 3 sandwiched therebetween is pressed at both ends in the direction in which the leaf spring member 2 is closed, the center portion is pulled, and conversely the leaf spring member. In the closing direction in which 2 spreads, the central portion is pressed, both end portions are pulled, and further deformed in the in-plane direction of the viscoelastic material 3 to generate direct strain and shear strain, and the damping force by the viscoelastic material 3 acts.

  In a state where the vibration level of the building is low, the leaf spring member 2 repeats deformation in the elastic range. However, when the vibration level becomes high, hysteresis damping force due to plastic deformation of the leaf spring member 2 also works.

  FIG. 3 shows an embodiment in which the present invention is applied to a ramen structure.

  In the steel frame, the beam-column joint is rigidly connected, and even if the spring / viscoelastic material composite damper 1 of the present invention is attached to the corner, deformation necessary for sufficient energy absorption cannot be obtained. Therefore, in this example, a V-shaped brace 15 is provided in the composition surface, and is connected to the center of the lower beam 12 via the connecting member 16, and both ends of the connecting member 16 are pin-bonded (pin joints 20).

  That is, the interlaminar displacement of the building due to an earthquake or wind is concentrated at the position of the connecting material 16 and the spring / viscoelastic material composite damper 1 of the present invention is attached to that portion, thereby achieving a large energy absorption effect.

  FIG. 4 shows an embodiment in which the present invention is applied to an existing ramen structure.

  As in the case of FIG. 3, the present invention is applied to a steel frame ramen, and both ends of the additional intermediate column 17 connecting the upper and lower beams 12 and the additional intermediate beam 18 connecting the left and right columns 11 are pin-joined, respectively. By using pin joints at the intersections between the additional studs 17 and the intermediate beam 18, the inter-layer displacement of the building due to earthquakes and winds is concentrated at this intersection, and the spring / viscoelastic composite damper 1 of the present invention is applied to that portion. A large energy absorption effect is achieved by mounting.

  FIG. 5 shows an embodiment in which the present invention is applied to a wooden horizontal surface.

  In general, there are many cases where the joints between structural members in wooden buildings are closer to pin joints than rigid joints, and conventionally, in order to suppress deformation of the joints between beams 12 on a horizontal surface such as a floor surface. There are fire and floor braces.

  The present invention utilizes deformation of the joint, and by attaching the spring / viscoelastic material composite damper 1 of the present invention instead of these, a large energy absorption effect can be obtained even in a wooden building. Of course, the present invention can be applied to a vertical surface of a wooden building or a horizontal surface of a steel structure.

  FIG. 6 shows a dynamic model illustrating a variation of the application mode of the present invention.

  (a) is a case where the upper and lower ends of the additional spacer 17 installed in the construction surface are pin-joined, and the spring / viscoelastic material composite damper 1 of the present invention is attached to the left and right of the upper and lower pin-joining positions.

  (b) shows a case where the left and right ends of the additional intermediate beam 18 installed in the construction surface are pin-joined, and the spring / viscoelastic material composite damper 1 of the present invention is attached above and below the left and right pin-joining positions.

  (c) is a pin joint at the upper and lower ends of the connecting member 19 that connects the middle part of the additional intermediate beam 18 and the middle part of the beam 12 installed in the construction surface, and the spring and viscoelasticity of the present invention are provided on the left and right of the pin joint position. This is a case where the composite material damper 1 is attached.

  (d) is a pin connection between the upper and lower ends of the connecting member 19 connecting the upper end of the additional spacer 17 and the intermediate part of the beam 12 installed in the surface, and the spring / viscoelastic material of the present invention is provided on the left and right of the pin connection position. This is a case where the composite damper 1 is attached. The deformation angle can be amplified by substantially reducing the distance between the fulcrums in this portion, and a high attenuation performance can be obtained even when there is little deformation as a building frame.

  (e) pin-connects the connecting panel 21 to the lower end of the connecting member 19 suspended from the beam 12, and horizontally connects the connecting panel 21 and one column 11 with the connecting member 19 having both ends pin-connected, This is a case where the spring / viscoelastic material composite damper 1 of the present invention is attached above and below the connecting portion with the connecting panel 21. By setting it as such a structure, the rotation angle in the spring / viscoelastic material composite type damper 1 installation position can be amplified. In this case, although there is a limit to deformation depending on the length of each connecting member 19, it is a stopper against excessive deformation.

  (f) connects the lower end of the connecting member 19 suspended from the beam 12 and the tip of the connecting member 19 projecting horizontally from one of the pillars 11, and both ends of each connecting member 19 are pin-joined. This is a case where the spring / viscoelastic material composite damper 1 of the present invention is attached. By setting it as such a structure, the number of the spring-viscoelastic material composite type dampers 1 which can be installed in one place can be increased, and the damping force can be raised.

  FIGS. 7A and 7B show examples of adjusting the spring stiffness of the spring / viscoelastic composite damper 1 of the present invention.

  (a) is a method of ensuring the necessary spring stiffness by superimposing the auxiliary leaf spring members 2a as a method of adjusting the spring stiffness when the spring stiffness of the leaf spring member 2 is insufficient with a standard product.

  (b) increases the rigidity of the pillar 11 and the beam 12 by installing a raising member 22 formed by processing a shape steel and attaching the spring / viscoelastic composite damper 1 through the raising member 22. It is what I did.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 shows an embodiment in which the joint structure of structural materials of the present invention is applied to a steel structure building, (a) is a front view at one column position, and (b) is a mechanical model diagram thereof. (C) is a front view of a junction part when a column beam junction part is made into pin junction. BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 shows an embodiment of a spring / viscoelastic material composite damper according to the present invention, in which (a) is a front view, (b) is a right side view, and (c) is a bottom view. It is a front view which shows one Embodiment in the case of applying this invention to a ramen structure. It is a front view which shows one Embodiment in the case of applying this invention to the existing ramen structure. It is a perspective view which shows one Embodiment in the case of applying this invention to a wooden horizontal surface. It is a dynamic model figure which illustrated the variation of the application form of this invention. (a), (b) is a front view which shows the adjustment example of the spring rigidity in the spring-viscoelastic material composite type damper of this invention, respectively.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Spring and viscoelastic material composite type damper, 2 ... Leaf spring member, 3 ... Viscoelastic material, 4 ... Holding member, 5 ... Bolt hole, 6 ... Stiffening rib, 7 ... Bolt, 8 ... Pin,
DESCRIPTION OF SYMBOLS 11 ... Column, 12 ... Beam, 13 ... Column beam joint, 13a ... Joint plate, 14 ... Column bottom joint, 15 ... V-shaped brace, 16 ... Connecting material, 17 ... Additional intermediate column, 18 ... Additional intermediate beam, DESCRIPTION OF SYMBOLS 19 ... Connection material, 20 ... Pin junction part, 21 ... Connection panel, 22 ... Raising material

Claims (5)

  A leaf spring member that is curved to be convex with respect to the joint portion on the inner corner side of the joint portion between the structural materials, and both ends are joined to one side of the structural material, and an inner peripheral surface of the curved portion of the leaf spring member A sheet-like viscoelastic material having a required thickness attached to the side, and a pressing member attached to the inner peripheral surface side of the curved portion of the viscoelastic material and substantially regarded as a rigid body in the deformation range of the leaf spring member And a spring / viscoelastic composite damper that absorbs vibration energy by deformation of the leaf spring member and deformation of the viscoelastic material sandwiched between the leaf spring member and the pressing member. A structure joint structure characterized by the above.   The joint structure of a structural material according to claim 1, wherein the structural materials are substantially pinned or semi-rigidly joined at the joint.   A leaf spring member curved in a convex shape, a sheet-like viscoelastic material having a required thickness attached to the inner peripheral surface side of the curved portion of the leaf spring member, and an inner peripheral surface side of the curved portion of the viscoelastic material; In the deformation range of the leaf spring member, the viscoelastic material includes a holding member that can be regarded as a substantially rigid body, and is sandwiched between the deformation of the leaf spring member, the deformation of the leaf spring member, and the holding member. This is a spring / viscoelastic composite damper that absorbs vibration energy by deformation.   4. The spring / viscoelastic material composite damper according to claim 3, wherein the leaf spring member and the viscoelastic material, and the viscoelastic material and the pressing member are bonded to each other.   5. The spring / viscoelastic material composite damper according to claim 3, wherein the leaf spring member is formed by bending a steel material having a required thickness.

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