JP2004019271A - Vibration-damping structural member - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a vibration-damping structural member which suppresses vibrations of a structure without additional provision of a vibration control device or the like. <P>SOLUTION: When columns 14 and beams 16 are horizontally deformed due to application of an external force of an earthquake or the like, relative displacement is generated at connecting pins 30, 34 arranged on diagonals in a frame portion. The relative displacement is amplified by first and second arm members 28, 32 forming a damping mechanism 13, and therefore an oil damper 44 connected to a connecting shaft 36 is largely deformed, to thereby restrict relative movement of the connecting shaft 36 and absorb vibrations of the structural member. More specifically, vibrations caused by the relative displacement between the structural members such as the columns 14 and beams 16 are not absorbed but vibrations caused by the displacement of the structural members per se are absorbed, and therefore vibrations of the structure caused by an earthquake or wind can be effectively damped, to thereby dispense with securement of a space for additional provision of the vibration control device in the structure. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
TECHNICAL FIELD The present invention relates to a vibration damping structural member having a function of suppressing a vibration of a structural member itself such as a column or a beam of the structure.
[0002]
[Prior art]
As shown in FIG. 25, rods 150 having the same length are combined in a rhombus shape, a damper 154 is arranged between the pin joints 152, the amount of deformation at the pin joint 156 is increased, and the damping property of the damper 154 is improved. There is a vibration damper device 158 (see Japanese Patent Application Laid-Open No. Hei 5-231310).
[0003]
Also, as shown in FIG. 26, the vibration damping device 110 is arranged between the building 140 and the building 144, and the deformation ratio of the buildings 140 and 144 that are relatively displaced is increased by the link member 112 constituting the toggle, so that the hydraulic pressure is increased. A vibration damping structure in which vibration energy is absorbed by the damper 142 has also been proposed.
[0004]
However, all of the above techniques, like beams and columns, or buildings and buildings, geometrically amplify the relative displacement between different structural members and attempt to dampen them, and require an installation space, Further, the vibration damping device cannot be assembled unless the structure is completed.
[0005]
[Problems to be solved by the invention]
In view of the above facts, the present invention provides a damping function to a structural member that constructs a structure, so that the vibration of the structure can be suppressed without requiring a new vibration damping device or the like. The task is to provide
[0006]
[Means for Solving the Problems]
According to the first aspect of the present invention, a vertical member and a horizontal member are connected to each other, and a structural member for constructing a structure, and a structural member disposed in the structural member and connected to a connecting portion between the vertical member and the horizontal member. Damping means movably connected to amplify and attenuate the relative displacement between the connecting portions, and disposed in the structural member and rotatably connected to a connecting portion between the vertical member and the horizontal member. And a spring effect amplifying means for amplifying relative displacement between the connecting portions to increase rigidity.
[0007]
According to the first aspect of the present invention, when the structural member is deformed in the horizontal direction or the vertical direction by an external force such as an earthquake acting on the structure, a relative displacement is caused in the diagonally connecting portion between the vertical member and the horizontal member. Occurs. This relative displacement is amplified and damped by the damping means.
[0008]
In other words, instead of absorbing the vibration caused by the relative displacement between the structural members such as columns and beams, the vibration itself caused by the displacement of the structural member itself is absorbed, thereby effectively suppressing the vibration of the structure caused by the earthquake or wind. Shake. Therefore, it is not necessary to separately secure a space for attaching the vibration damping device to the structure.
[0009]
Further, by providing the spring effect amplifying means between the connecting portions, the relative displacement between the connecting portions can be amplified to increase the rigidity of the structural member.
[0010]
According to a second aspect of the present invention, the damping means is provided on two diagonal lines of the first arm member, one end of which is rotatably connected to a connecting portion between the vertical member and the horizontal member, and the connecting portion. A link mechanism is formed by rotatably connecting two second arm members, one ends of which are rotatably connected to a connecting portion, and the other end of the first arm member and the other end of the second arm member, respectively. And a damper connected to the connecting member and restricting relative movement between the connecting members.
[0011]
According to the second aspect of the invention, one ends of the two first arm members are rotatably connected to the connecting portion between the vertical member and the horizontal member, and the two second arm members are connected to the connecting portion on the diagonal line of the connecting portion. One end of the arm member is rotatably connected. The other end of the first arm and the other end of the second arm member are rotatably connected by connecting members, respectively, to form a link mechanism.
[0012]
Here, when a relative displacement occurs in the connecting portion between the vertical member and the horizontal member on the diagonal line due to an earthquake or the like, the first arm member and the second arm member rotate around the connecting portion, and the first arm member rotates. A connecting member connecting the other end of the arm member and the other end of the second arm member is greatly displaced.
[0013]
A damper is connected to each of the connecting members, and the damper is greatly deformed to limit the relative movement of the connecting member.
[0014]
Therefore, a relationship of small deformation × large force = large deformation × small force is established, and the damper connected to the connecting member absorbs the vibration of the structural member by the small force, and as a result, absorbs the vibration of the structure. . In addition, a small displacement of a connecting portion between a vertical member and a horizontal member on a diagonal line is amplified by a large displacement and absorbed, so that vibrations due to a small or medium-sized earthquake or wind can be effectively absorbed.
[0015]
The invention described in claim 3 is characterized in that the connecting members or the connecting member and the connecting portion are connected by a spring member. In this configuration, the connecting members are connected to each other or the connecting member and the connecting portion by a spring member, thereby restricting free movement of the first arm member and the second arm member. For this reason, the structural member is prevented from being carelessly shaken by the strong wind. In addition, a compression coil spring or a tension coil spring can be used as the spring material.
[0016]
The invention according to claim 4 is characterized in that a mass body is attached to the connecting member. In this configuration, since the mass body is attached to the connecting member, the swing width of the first arm member and the second arm member increases, and the amplification effect also increases.
[0017]
BEST MODE FOR CARRYING OUT THE INVENTION
As shown in FIG. 1, the vibration damping structural member according to the first embodiment is used as a column 14 or a beam 16 that supports a roof 12 of a structure 10.
(Post)
As shown in FIGS. 2 and 3, the column 14 has a long box shape in which four steel vertical members 18 are arranged in parallel in four directions and connected by steel horizontal members 20. The axial force of the four vertical members 18 is the supporting force of the column 14.
[0018]
A damping mechanism 13 as damping means is constructed in each frame section divided by the cross member 20 in a lattice shape. Flanges 22 and 24 and a pair of flanges 26 that constitute the damping mechanism 13 are provided diagonally on the connecting portion of the frame.
[0019]
One end of a first arm member 28 made of steel is rotatably attached to the flange 22 via a connecting pin 30, and the two first arm members 28 have a predetermined angle. One end of a second steel arm member 32 is rotatably attached to the flange 24 on the diagonal line with the flange 22 via a connecting pin 34, and the two second arm members 32 exhibit a predetermined angle. ing.
[0020]
The other end portions of the first arm member 28 and the second arm member 32 are rotatably connected by a connecting shaft 36, respectively. That is, when the connecting shafts 36 approach each other, the angle formed by the two first arm members 28 of the connecting pin 22 and the angle formed by the two second arm members 32 of the connecting pin 34 become smaller. When separated, the angle between the two first arm members 28 of the connecting pin 22 and the angle between the two second arm members 32 of the connecting pin 34 increase.
[0021]
Further, the central portion and both end portions of the connecting shaft 36 facing each other are connected by three coil springs 38 and urge the connecting shafts 36 in a direction to approach each other. The center of the connecting shaft 36 and the connecting pin 40 provided on the flange 26 are connected by a coil spring 42, respectively, and urge the connecting shaft 36 in a direction to separate from each other. The attitude (diamond shape) of the first arm member 28 and the second arm member 32 is maintained by the coil springs 38 and 42, and the behavior is suppressed.
[0022]
Further, two dampers 44 are arranged between the connection shaft 36 and the connection pin 40 so as to be parallel to the coil spring 42. A cylinder 44A of the damper 44 is rotatably connected to the connecting pin 40, and a rod 44B of the damper 44 is rotatably connected to the connecting shaft 36.
[0023]
In FIG. 2, the damping mechanism 13 including the first arm member 28, the second arm member 32, the damper 44, and the coil springs 38 and 42 is shown only in the uppermost and lowermost frame portions. Are provided on all the frame parts.
(Beam)
As shown in FIGS. 1 and 4, the beam 16 has a box structure composed of a steel upper chord 46 (horizontal member), a lower chord member 48 (horizontal member), and a rectangular frame member 50 connecting these members. In addition, both ends are fixed to the upper part of the column 14 to form a part of the ramen structure.
[0024]
In the frame portion of the beam 16, a damping mechanism 13 of the same structure provided on the support column 14 is constructed, and the beam 16 itself can suppress shaking due to an earthquake or the like. As shown in FIG. 1, the roof 12 is bridged on the beams 16 to form a large space with a roof.
[0025]
Next, how the vibration damping structural members (posts, beams) according to the present embodiment function when an external force due to an earthquake or the like acts on the structure will be described.
[0026]
When the structure 10 shown in FIG. 1 is horizontally deformed rightward due to an earthquake or the like, as shown in FIG. 5 (illustrating the actual behavior), the left support 14 tilts to the left, and The connecting pin 30 provided on the connecting portion and the connecting pin 34 on the diagonal line are relatively displaced to increase the interval.
[0027]
Accordingly, the angle formed between the first arm members 28 by rotating the first arm members 28 around the connection pins 30 is reduced. Further, the second arm member 32 rotates around the connection pin 34, and the angle formed between the second arm members 32 decreases. For this reason, the interval between the connecting shafts 36 connecting the first arm member 28 and the second arm member 32 is reduced.
[0028]
The displacement of the connecting shaft 36 is amplified from the relative displacement between the connecting pin 30 and the connecting pin 34 due to the geometrical characteristics of the diamond-shaped link mechanism. For this reason, the rod 44B of the oil damper 42 connected to the connection pin 40 extends, is efficiently converted to heat and absorbed, and the displacement of the connection shaft 36 is limited, so that the vibration of the structure 10 is attenuated. You.
[0029]
The term “efficiently” means that even if the relative displacement between the connecting pin 30 and the connecting pin 34 is small, the connecting shaft 36 is largely displaced and the displacement of the damper 44 is large, so that the vibration energy absorption efficiency is good. is there.
[0030]
In the damping mechanism 13 on the left side of the beam 16, the distance between the connection pin 30 and the connection pin 34 located diagonally to the connection pin 30 is widened, and the first arm member 28 rotates around the connection pin 30. As a result, the angle between the first arm members 28 increases. Further, the second arm member 32 rotates about the connection pin 34, and the angle formed between the second arm members 32 increases. Therefore, the distance between the connecting shafts 36 connecting the first arm member 28 and the second arm member 32 is increased.
[0031]
Since the displacement of the connecting shaft 36 is amplified from the relative displacement of the connecting pins 30 and 34, the rod 44B of the oil damper 44 connected to the connecting pin 40 contracts, and the vibration energy is converted into heat. Absorbed.
[0032]
On the other hand, in the damping mechanism 13 on the right side of the beam 16, the distance between the connection pin 30 and the connection pin 34 located diagonally to the connection pin 30 increases, and the connection shaft 36 approaches and is connected to the connection pin 40. The rod 44B of the oil damper 44 expands, and the vibration energy is converted into heat and absorbed.
[0033]
Further, the right support 14 is also deformed to separate the connection shaft 36, whereby the movement of the first arm member 28 and the second arm member 32 is restricted by the oil damper 44, and the vibration energy is absorbed. You.
[0034]
As described above, in the present invention, the vibration of the structure 10 due to an earthquake or wind is effectively damped by absorbing the vibration itself of the vibration damping structural members of the columns 14 and the beams 16. Therefore, it is not necessary to separately secure a space for mounting the vibration damping device on the structure 10.
[0035]
In the present embodiment, the damper 44 and the coil spring 42 are arranged in parallel as shown in FIG. 3, but in order to reduce the mounting space, the coil spring 42 is connected to the damper 44 like the damping mechanism 15 shown in FIG. 44, the coil spring 42 and the damper 44 may be integrated.
[0036]
Further, in the present embodiment, the damping mechanism is arranged at both ends of the beam so that the damping effect is exerted uniformly regardless of the swing direction. However, the damping mechanism may be arranged in all the frame parts. Furthermore, although a coil spring has been described as an example of a means for holding the posture, the type of the spring is not particularly limited.
[0037]
Further, the damper is not limited to an oil damper, and a general-purpose damper using a frictional force, air, or the like can be used. Further, as illustrated in the second embodiment, by attaching the auxiliary mass body to the connection shaft 36 described in the first embodiment, the swing width of the first arm member 28 and the second arm member 32 increases, and the displacement of the first arm member 28 and the second arm member 32 increases. The amplification rate can be increased.
[0038]
Next, a vibration damping structural member according to a second embodiment will be described.
[0039]
The vibration damping structural members of the second and subsequent embodiments will be described by taking a beam as an example, but it is a matter of course that they can be arranged on a support.
[0040]
As shown in FIG. 7, a fixed arm 58 extends diagonally from a connection portion of the frame portion of the beam 56 as a vibration damping structural member. A frame member 60 is fixed to the tip of the fixed arm 58 so as to draw a T-shape. One end of a first arm member 62 is rotatably connected to both ends of the frame member 60, and is inclined to the fixed arm 58 side.
[0041]
The other end of the first arm member 62 is rotatably connected to the other end of the second arm member 64 via a connection shaft 68. One end of the second arm member 64 is rotatably connected to a connecting portion on an extension of the fixed arm 58 by a connecting pin 66.
[0042]
The connection shafts 68 are connected by a coil spring 70. A connecting shaft 76 and a connecting pin 76 on a diagonal line intersecting with the fixed arm 58 are connected by a coil spring 72. The frame member 60 and the connection pin 66 are connected by a coil spring 76. Thereby, the substantially triangular posture constituted by the first arm member 62 and the second arm member 64 is maintained, and the behavior is suppressed.
[0043]
Further, an oil damper 74 is disposed between the connection shaft 68 and the connection pin 76 so as to be parallel to the coil spring 72, and is rotatably connected to the connection shaft 68 and the connection pin 76.
[0044]
Next, how the vibration damping structural member (beam 56) according to this embodiment functions when an external force due to an earthquake or the like acts on the structure will be described.
[0045]
When an external force acts on the beam 56 in the right direction, as shown in the schematic diagram of FIG. 8, the holding member 52 tilts to the right, and the frame member 60 and the connecting pin 66 are relatively displaced to reduce the interval. As a result, the second arm member 64 rotates about the connection pin 66, and the angle formed between the first arm member 62 and the second arm member 64 is reduced, so that the first arm member 62 and the second arm member 64 The distance between the connecting shafts 68 connecting the two is narrowed.
[0046]
The displacement of the connecting shaft 68 is amplified from the relative displacement between the frame member 60 and the connecting pin 66 due to the geometric characteristics of the link mechanism. For this reason, the rod of the oil damper 74 connected to the connecting pin 76 is extended, and the displacement of the connecting shaft 68 is limited, so that the vibration of the structure 10 is damped.
[0047]
Further, when the beam 56 vibrates up and down, as shown in the schematic diagram of FIG. 9, when the beam 56 swings downward, the frame member 60 and the connecting pin 66 are relatively displaced to increase the interval. Therefore, the distance between the connecting shafts 68 connecting the first arm member 62 and the second arm member 64 is increased. The displacement of the connecting shaft 68 is amplified from the relative displacement between the frame member 60 and the connecting pin 66 due to the geometrical characteristics of the link mechanism. For this reason, the rod of the oil damper 74 connected to the connecting pin 76 contracts, and the displacement of the connecting shaft 68 is limited, so that the vertical vibration of the structure 10 is attenuated.
[0048]
In addition, as shown in FIG. 10, by attaching the auxiliary mass body 78 to the connection shaft 68, the swing of the first arm member 62 and the second arm member 64 is increased, and the amplification effect can be improved.
[0049]
Next, a vibration damping structural member according to a third embodiment will be described.
[0050]
As shown in FIG. 11, in the beam 80 of the third embodiment, the first arm member 82 is directly connected to the distal end of the fixed arm 58 without the bridge member 60 of the second embodiment, and And a substantially triangular link mechanism.
[0051]
Also in this configuration, as shown in FIGS. 12 and 13, left and right and up and down vibrations of the structure can be damped, and as shown in FIG. 14, the auxiliary mass body 84 is attached to the connecting shaft 68. Thus, the swing width of the first arm member 82 and the second arm member 64 can be increased.
[0052]
Next, a vibration damping structural member according to a fourth embodiment will be described.
[0053]
As shown in FIG. 15, the beam 86 of the fourth embodiment is the same as the first embodiment to the third embodiment in that the displacement of the connecting portion is amplified and the oil damper is largely displaced to suppress the vibration of the structural member. However, the difference is that the oil damper 88 is disposed inside the star-shaped link mechanism of the first arm member 90 and the second arm member 92.
[0054]
In this configuration, one end of the first arm member 90 is rotatably connected to the connection pin 94, and the other end is rotatably connected to the other end of the second arm member 92 via the connection shaft 96. One end of the second arm member 92 is rotatably connected to both ends of a support arm 98 disposed in a direction orthogonal to a diagonal line of the connection pin 94.
[0055]
One end of a coil spring 100 is connected to the connection pin 101 of the support arm 98, and the support arm 98 is supported in the frame by fixing the other end of the coil spring 100 to the connection portion. Two oil dampers 88 are arranged in series on the connecting shaft 96 so as to cross each other, so that a large relative displacement of the connecting shaft 96 can be accommodated.
[0056]
Also in this configuration, left and right and up and down vibrations of the structure can be attenuated as shown in FIGS. 16 and 17, and the auxiliary mass body 102 is attached to the connecting shaft 96 as shown in FIG. Thus, the swing width of the first arm member 90 and the second arm member 92 can be increased.
[0057]
Further, since one end of the second arm member 92 is rotatably connected to the support arm 98 supported by the coil spring 100, the swing width is large even if an external force due to an earthquake is input from any angle. The connecting shaft 96 can be moved.
[0058]
Further, by arranging the oil dampers in series, even when the installation distance is long, a general-purpose oil damper can be used, so that the production cost can be reduced.
[0059]
Further, the present invention can be applied to not only buildings but also civil engineering structures to which vibration is always applied, such as bridges.
[0060]
As shown in FIG. 19, the bundle member 23 is attached to the frame member 50 at the center of the beam 16 of the structural member having the rigid frame structure shown in FIG. 1, and the floor slabs 27 are attached to both ends of the beam 16. I have. At both ends of the frame member 52 reinforced by the bundle member 23 and the beam 16 reinforced by the floor slab 27, a pretension member 29 is provided, and the pretension member 29 generates a pretension force. This increases the rigidity of the beam 16.
[0061]
Further, in the columns 14 and the beams 16 shown in FIG. 1, a pair of damping mechanisms 13 are arranged in the frame portion. However, in the vibration damping structural member of the fifth embodiment shown in FIGS. The support 33 and the beam 31 in which one damping mechanism 13 is disposed so as to cross the horizontal direction, thereby reducing the number of components.
[0062]
Further, the beam 31 has a single platform truss structure in which a diagonal member 57 and a bundle member 52 are arranged, and both ends are supported by a gantry 54 provided above the column 33. The gantry 54 is fixed to the center of the cloth material 53.
[0063]
As described above, the vibration damping structural member of the present invention can be used regardless of the structure type.
[0064]
Further, as shown in FIG. 23, in a support 143 of the vibration damping structure member according to the sixth embodiment, a breath member 149 is connected to a connection portion of a frame portion configured by the vertical members 18 and the horizontal members 20, The rigidity of the column 143 is improved. Further, as shown in FIG. 24, the damping mechanism 13 is attached to the support 145 of the vibration damping structural member according to the seventh embodiment so as to face the outer surface of the frame portion composed of the vertical members 18 and the horizontal members 20. Has been. An auxiliary column 147 made of steel pipe or concrete is provided upright at the center of the column 145. The auxiliary columns 147 support the roof 12 and reduce the load acting on the columns 145.
[0065]
【The invention's effect】
Since the present invention is configured as described above, it is possible to suppress the swing of the structure as a structural member without newly installing a vibration damping device or the like on the structure.
[Brief description of the drawings]
FIG. 1 is a perspective view showing a structure of a large space with a roof constructed with a vibration damping structural member according to a first embodiment.
FIG. 2 is a perspective view showing a support as a vibration damping structure member according to the first embodiment.
FIG. 3 is a plan view showing a damping mechanism of the vibration damping structure member according to the first embodiment.
FIG. 4 is a front view showing a normal state of columns and beams which are vibration damping structural members according to the first embodiment.
FIG. 5 is a front view showing the state of the columns and beams, which are the vibration damping structural members according to the first embodiment, during an earthquake.
FIG. 6 is a plan view showing a damping mechanism of another vibration damping structure member.
FIG. 7 is a front view showing a beam of a vibration damping structural member according to a second embodiment.
FIG. 8 is a schematic diagram showing a state in which a beam of a vibration damping structural member according to a second embodiment is swaying.
FIG. 9 is a schematic view showing a state in which a beam of a vibration damping structural member according to a second embodiment is pitching.
FIG. 10 is a front view showing a state where an auxiliary mass body is attached to a beam of the vibration damping structural member according to the second embodiment.
FIG. 11 is a front view showing a beam of a vibration damping structural member according to a third embodiment.
FIG. 12 is a schematic diagram illustrating a state in which a beam of a vibration damping structural member according to a third embodiment is swaying.
FIG. 13 is a schematic diagram showing a state in which a beam of a vibration damping structural member according to a third embodiment is pitching.
FIG. 14 is a front view showing a state in which an auxiliary mass body is attached to a beam of the vibration damping structural member according to the third embodiment.
FIG. 15 is a front view showing a beam of a vibration damping structural member according to a fourth embodiment.
FIG. 16 is a schematic diagram illustrating a state in which a beam of a vibration damping structural member according to a fourth embodiment is swaying.
FIG. 17 is a schematic diagram showing a state in which a beam of a vibration damping structural member according to a fourth embodiment is pitching.
FIG. 18 is a front view showing a state in which an auxiliary mass body is attached to a beam of a vibration damping structural member according to a fourth embodiment.
FIG. 19 is a perspective view showing a modification of the vibration damping structure member according to the first embodiment.
FIG. 20 is a perspective view showing a structure of a large space with a roof constructed with a vibration damping structural member according to a fifth embodiment.
FIG. 21 is a perspective view showing a support as a vibration damping structure member according to a fifth embodiment.
FIG. 22 is a plan view showing a damping mechanism of a vibration damping structure member according to a fifth embodiment.
FIG. 23 is a perspective view showing a support as a vibration damping structure member according to a sixth embodiment.
FIG. 24 is a perspective view showing a support as a vibration damping structure member according to a seventh embodiment.
FIG. 25 is a front view showing a mounting state of a conventional vibration damper.
FIG. 26 is a front view showing an example in which the vibration damping device is installed between buildings.
[Explanation of symbols]
13 Damping mechanism (damping means)
14 props (structural members)
16 beams (structural members)
28 First arm member 32 Second arm member 36 Connection shaft (connection member)
38 Coil spring (spring member)
42 Coil spring (spring member)
44 Oil damper (damper)
78 Auxiliary mass body (mass body)

Claims (4)

A structural member configured by connecting a vertical member and a horizontal member, and constructing a structure;
A damping means arranged in the structural member, rotatably connected to a connecting portion between the vertical member and the horizontal member, and amplifying and attenuating a relative displacement between the connecting portions,
A spring effect amplifying means arranged in the structural member, rotatably connected to a connecting portion between the vertical member and the horizontal member, and amplifying relative displacement between the connecting portions to increase rigidity,
A vibration damping structural member comprising: The attenuation means,
Two first arm members, one ends of which are rotatably connected to a connecting portion of the vertical member and the horizontal member, and two first arm members, one ends of which are rotatably connected to a connecting portion on a diagonal line of the connecting portion. A second arm member, a connecting member that forms a link mechanism by rotatably connecting the other end of the first arm member and the other end of the second arm member, and a connecting member that is connected to the connecting member. The damping structure member according to claim 1, further comprising: a damper for restricting relative movement between the damping members. The damping structure member according to claim 2, wherein the connecting members are connected to each other or the connecting member and the connecting portion are connected by a spring member. The vibration damping structural member according to claim 2, wherein a mass body is attached to the connecting member.

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