JP6224357B2 - Vibration control structure - Google Patents

Description

  The present invention relates to a vibration damping structure.

  The so-called Piroti building that opens the part corresponding to the first floor of the building and uses it for large spaces such as stores and parking lots, and supports the part above the second floor with a pillar is 2 against the vibration of the car and the shaking of the earthquake. The part above the floor tends to shake greatly. For this reason, in order to ensure earthquake resistance in this type of building, a seismic structure and damping structure consisting of braces and braces are provided between the beams and pillars that support the building, and more than two floors are shaken. (Patent Document 1).

  By the way, when a space corresponding to the first floor of the piloti building is used as a parking lot, if a bracing or a cane as disclosed in Patent Document 1 is provided, these earthquake-resistant structures and damping structures are provided. The entrance / exit of the parking lot was blocked, and there was a possibility that the entrance / exit of the car might be hindered and the parking lot could not be used effectively.

  Therefore, as a means to solve such problems, a damping structure such as a damper is provided directly below the beam, and it is designed to secure the entrance of the parking lot so that it does not protrude greatly below the beam. The structure is known (Patent Document 2). Since such a vibration control structure does not hinder the entrance and exit of the car, a portion corresponding to the first floor of the piloti building can be widely used as a parking lot.

JP 2009-167642 A JP 2005-171515 A

  However, in the vibration damping structure disclosed in Patent Document 2, an L-shaped coupling metal is provided at the corner where the column and the beam intersect, and a hydraulic damper is provided in parallel to the beam, Since the tip of the damper is fixed to the bracket on the beam side, a certain effect can be expected with the hydraulic damper against the rolling of an earthquake in which the beam swings in the left-right direction, while against the vertical shaking In some cases, the damping effect of the hydraulic damper was not always sufficient.

  Therefore, the object of the present invention is to ensure a sufficient space in the portion corresponding to the first floor of the building, and to have sufficient damping performance against vehicle vibrations, earthquake rolls and pitches. It is to provide a vibration control structure that can be demonstrated.

In order to solve the above-described problems, the vibration damping structure of the present invention is disposed at a corner near the intersection of a column and a beam, and a base end portion is joined to the column so that the column is substantially parallel to the beam. A protruding rigid member and a vibration damper that is slanted between the tip of the rigid member and the beam are provided.

  In addition, a trapezoidal closed space closed by a rigid member and a vibration damper is formed at a corner near the intersection of the column and the beam.

  According to the vibration damping structure of the present invention, since the vibration damping damper is bridged between the beam and the rigid member that protrudes from the column substantially parallel to the beam, it is possible to suppress the downward extension of the vibration damping damper. It is possible to sufficiently secure the space corresponding to the first floor of the building. In addition, by damping the vibration damper between the pillar and the beam, the vibration damping performance can be sufficiently exerted against the vibration of the car and the roll or pitch of the earthquake.

It is a perspective view of the piloti building provided with the damping structure concerning the present invention. 1 is an overall view showing an embodiment of a vibration damping structure according to the present invention. It is a perspective view which shows one Example of the connection part by the side of the column of the damping structure which concerns on this invention. It is a perspective view which shows the other Example of the connection part by the side of the pillar of the damping structure which concerns on this invention. It is a perspective view which shows one Example of the connection part by the side of the beam of the damping structure which concerns on this invention. It is the schematic which shows the structure of a pillar and a beam provided with three types of different damping structures. It is a figure which shows the effect | action of the damping structure which concerns on this invention. It is a perspective view which shows the state which spanned the shelf board over the damping structure which concerns on this invention.

  Hereinafter, embodiments of a vibration damping structure according to the present invention will be described in detail with reference to the accompanying drawings. FIG. 1 shows a piloti building 1 having a vibration control structure according to the first embodiment of the present invention. The piloti building 1 has a large space portion 2 in a portion corresponding to the first floor, and four beams 3 extending the space portion 2 in four directions and four columns 4 supporting the four corners of each beam 3 are divided into two. It is a structure that supports the floor portion 2a. A vibration damping structure 5 according to the present embodiment is provided in the upper corner near each beam 3 of the piloti building 1 and the pillars 4 at the left and right ends of each beam 3. In FIG. 1, the damping structure 5 is provided in each of the eight upper corners.

  As shown in FIG. 2, each of the vibration damping structures 5 includes a rigid member 6 that protrudes substantially parallel to the beam 3 from each inner side surface 4 a of the square column 4, and a distal end portion of the rigid member 6 and the beam. 3 is provided with a vibration damper 7 that extends in an oblique direction. As described above, in this embodiment, the rigid member 6 is protruded from the column 4 and one end portion of the vibration damper 7 is connected to the distal end portion of the rigid member 6 so that the column 4 and the beam 3 intersect each other. In the upper corner portion, a trapezoidal closed space 2 b closed by the rigid member 6 and the vibration damper 7 is formed. The rigid member 6 is cantilevered by the column 4 and, as in this embodiment, the auxiliary member 8 is interposed between the column 4 and the rigid member 6 in the trapezoidal closed space 2b. There is a case where a truss structure is used.

  The rigid member 6 is made of a square closed cross-section steel material as shown in FIG. 3 or an H-shaped steel material as shown in FIG. The rigid member 6 is joined to the inner side surface 4a of the column 4 via a rectangular flat plate bracket 10 attached to the base end portion. Further, a distal end bracket 11 for connecting one end portion 7 a of the vibration damper 7 is attached to the distal end portion of the rigid member 6. The front end racket 11 is composed of a rectangular flat plate 11a similar to the flat plate bracket 10 and a protruding plate 11b welded to the front surface of the flat plate 11a. One end of the vibration damper 7 is formed on the protruding plate 11b. The part 7a is rotatably connected. The size and shape of a closed cross section such as a square closed cross section steel material used as the rigid member 6 and an open cross section such as an H-shaped steel material, the upper and lower reinforcing rib plates 10a and 10b provided on the flat plate bracket 10, etc. It is appropriately selected depending on the structural design. Further, as shown in FIG. 2, what is selected for the damping damper 7 is the protruding length L of the rigid member 6 from the column 4 and the height H from the ground 12 fixed to the column 4. Although it can be determined as appropriate depending on whether or not to do so, it is determined in consideration of the entry and exit of the vehicle 14 to and from the space 2.

  As shown in FIGS. 3 and 4, the auxiliary member 8 is formed of a rectangular tubular steel material, a flat plate-like rear end bracket 13 is joined to the inner side surface 4 a of the column 4, and the tip is a rigid member 6. The front end bracket 11 is joined. The cross-sectional shape of the auxiliary member 8 and the reinforcing rib plate 13a provided on the rear end bracket 13 can be appropriately selected. In this way, by providing the auxiliary member 8, a truss structure can be formed between the column 4 and the rigid member 6, so that it works more effectively against the vibration.

  As shown in FIGS. 2 and 5, the vibration damper 7 has a beam side in which one end 7 a is connected to the front end bracket 11 of the rigid member 6 and the other end 7 b is joined to the lower surface 3 a of the beam 3. By being connected to the bracket 15, it is bridged obliquely between the distal end portion of the rigid member 6 and the lower surface 3 a of the beam 3. The beam-side bracket 15 includes a rectangular flat plate 15a joined to the lower surface 3a of the beam 3, and a protruding plate 15b welded to the flat plate 15a. The other end of the damping damper 7 is connected to the protruding plate 15b. 7b is rotatably connected. In some cases, the protruding plate 15b may be directly welded to the bottom surface 3a of the spring without using the flat plate 15a. The position of the beam-side bracket 15 provided on the lower surface 3 a of the beam 3, that is, the distance from the column 4 to the beam-side bracket 15 is appropriately determined depending on the type of the vibration damper 7 employed.

  The damping damper 7 is not particularly limited as long as it has a mechanism that prevents the building from being damaged by absorbing energy by the damper itself when the building is deformed by vibration, and has a known mechanism. Commercial products can be used.

  As described above, the vibration damping structure 5 provided in the upper corner near the intersection of the column 4 and the beam 3 directly connects the one end portion 7a of the vibration damper 7 that is obliquely spanned to the column 4. Instead, the trapezoidal closed space 2b is formed by being connected to the distal end portion of the rigid member 6 that protrudes substantially parallel to the beam 3 from the column 4, so that the damping damper 7 as shown in FIG. As compared with the case where the one end portion 7a is extended with an imaginary line and connected to the pillar 4 as it is, the height h can be set higher from the ground 12. That is, in this vibration damping structure 5, the protrusion of the vibration damping damper 7 to the column 4 side can be suppressed by the height h, so that the height of the space portion 2 corresponding to the first floor of the building is secured accordingly. As a result, convenience in use as a parking lot is enhanced, and it is easy to use as a store in a large space.

  On the other hand, regarding the vibration damping performance of the vibration damping structure 5, the vibration damping performance when the one end 7a of the vibration damper 7 is connected to the tip of the rigid member 6 protruding from the column 4 as in the present invention, As shown by the phantom line in FIG. 2, when one end portion 7 a of the vibration damper 7 is extended as it is and compared with the vibration damping property when connected to the pillar 4, both have substantially the same vibration damping properties. Is clear from the following analysis results.

  FIG. 6 shows a structure of a column and a beam having three different types of vibration control structures. First, as shown in FIGS. 6A, 6 </ b> B, and 6 </ b> C, a common structure including a pair of left and right column members 20 and upper and lower beam members 21 a and 21 b that connect the column members 20 is assumed. did. Among them, the structure shown in FIG. 6 (a) has the vibration damping structure of the present invention, and the structure shown in FIGS. 6 (b) and 6 (c) is for comparison with the present invention. It has a vibration control structure. The vibration damping structure of FIG. 3 (b) is obtained by extending the damper 22 shown in FIG. 6 (a) and connecting it to the column member 20, and the vibration damping structure of FIG. 6 (c) is shown in FIG. 6 (a). The damper 22 is connected to the position where the rigid member 23 shown in FIG. The cross section of the column 20 is 250 × 250 × 9, and the cross sections of the beams 21a and 21b are 300 × 150 × 6.5 × 9. The damper 22 is replaced with a steel pipe cross section of φ48.6 × 3.2. The cross section of the rigid member 23 is 150 × 100 × 4.5, and the cross section of the auxiliary member 24 is 75 × 45 × 3.2.

6A, 6B, and 6C, A = 3000, B = 6000, a1 = 1000, a2 = 1365, b = 1500, c = 400, and the unit is millimeter.
P is an external force applied to each structure in the direction of the arrow at the position of the arrow. R is a reaction force generated in the direction of the arrow at the position of the arrow when the external force P is applied.

  Under the above conditions, each structure was analyzed to compare the rigidity of the columns. The results are shown in Table 1. As is clear from Table 1, the displacement δ of the beam 21b, the reaction force R, and the rigidity K of the column member 20 are the values of the structure including the vibration damping structure of the present invention shown in FIG. It turned out that the value of the structure of the comparative example shown in 6 (b) is the same, and there is no great difference in the vibration damping performance between the two. In addition, each numerical value in Table 1 is a thing when the numerical value of the external force P is set to 1.

  Further, in the above-described vibration damping structure 5, the vibration damping damper 7 is slanted between the column 4 and the beam 3 to form a trapezoidal closed space 2 b with the rigid member 6. As shown in FIG. 7, the damping damper 7 effectively acts on both the vibration Y and the pitch T of the earthquake as well as the vibration of the car to absorb energy, Can suppress shaking.

  FIG. 8 shows an embodiment in which a shelf board 16 is provided at the corner of the space 2 corresponding to the first floor of the piloti building 1 using the above-described vibration damping structure 5. In this embodiment, each rigid member 6 of the vibration damping structure 5 is used, and a long flat plate 16 is spanned between each adjacent rigid member 6. It is only necessary to place the shelf 16 on the upper surface of each rigid member 6. Tools and other various objects can be placed on the shelf board 16. The length of the shelf board 16 is arbitrary, and the shelf board 16 may be spanned between two adjacent rigid members 6 or may be spanned between three rigid members 6 arranged in a row. Further, it is desirable that the shelf plate 16 is provided at a position that does not interfere with the entry and exit of the space portion 3.

DESCRIPTION OF SYMBOLS 1 Piloti building 2 Space part 2a 2nd floor part 2b Trapezoid closed space 3 Beam 3a Underside of beam 4 Column 4a Inner side surface 5 Damping structure 6 Rigid member 7 Damping damper 7a End part of damping damper 7b Damping of damping damper Other end portion 8 Auxiliary member 10 Flat plate bracket 10a, 10b Reinforcement rib plate 11 Front end bracket 11a Flat plate 11b Projection plate 12 Ground 13 Rear end bracket 13a Reinforcement rib plate 14 Car 15 Beam side bracket 15a Flat plate 15b Projection plate 16 Shelf plate

Claims (5)

A rigid member that is disposed at a corner near the intersection of the column and the beam, has a proximal end joined to the column, and protrudes substantially parallel to the beam from the column; and a distal end of the rigid member and the beam A vibration control structure including a vibration damper that is slanted between them.   The damping structure according to claim 1, wherein a trapezoidal closed space closed by a rigid member and a damping damper is formed at a corner near the intersection of the column and the beam.   The vibration damping structure according to claim 1, wherein an auxiliary rigid member that connects the column and the distal end portion of the rigid member is disposed above the rigid member.   The damping structure according to any one of claims 1 to 3, wherein the rigid member is formed of a steel material having a closed cross-sectional structure, an H-type steel material, or the like. Damping structure according to any one of claims 1 to 4 shelf plate between the rigid members together to fit Ri next is passed over.

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