JP2004308224A - Diagonal brace - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an inexpensive diagonal brace with a simple constitution by making both compatible in preventing deformation in a typhoon and increasing yield strength against an earthquake by adding damping force in proportion to a speed in a building even if there is restriction on an installation space. <P>SOLUTION: This diagonal brace has a rigid material 10 having a connecting part 16 with a building structure in both end parts, a splicing member 12 extending along the rigid material 10 from one end of the rigid material 10, and a viscoelastic member 14 for generating the damping force to relative displacement of the rigid material 10 and the splicing member 12 by interposing between the other end part of the splicing member 12 and the rigid material 10. The rigid material 10 is composed of a rod. The splicing member 12 is a cylindrical member for covering the outer peripheral side of the rod. The viscoelastic member 14 fills up a cylindrical space formed between the rod and the cylindrical member. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a brace used to reinforce a building structure, and in particular, can improve the proof stress of a building structure and can be deformed even when a slow force such as a typhoon is applied. The present invention relates to a bracing that can add a damping force so as to prevent the above.
[0002]
[Prior art]
It is effective to use braces to increase the strength of buildings. In wooden houses and small steel buildings, a wooden board or a turnbuckle, that is, a structure that gives a desired tension by tightening a screw is used as a brace. FIG. 3 shows an example of a turnbuckle. In FIG. 3, a pillar 40 standing up at a predetermined interval and another pillar 40 are connected by a horizontal beam 42 at an appropriate height position. The beam 42 is fixed at an appropriate interval in the vertical direction, and a frame-type structure is assembled by the support column 40 and the beam 42. The intersection of the column 40 and the beam 42 which is the diagonal position of the frame is connected by a turnbuckle 44. As is well known, when the nut of the turnbuckle 44 is rotated, a tensile force is generated between the diagonal positions of the frame, and the strength of the building is increased.
[0003]
Also, braces are often used in buildings. FIG. 4 shows an example of a brace, in which a brace 46 is coupled to the diagonal position of the frame formed by the pillar 40 and the beam 42. In a building, a resistance force F is generated when the turnbuckle is stretched and when the brace is stretched. Resistance force F is
F = K _B × δ
Given in. Here, K _B = brace rigidity and δ = brace deformation amount. Thereby, the displacement between the layers of a building at the time of an earthquake is suppressed. In addition, since the rigidity of the building itself is increased, deformation of the building during a typhoon is prevented.
[0004]
However, since bracing increases the rigidity of the building, the natural period T of the building is reduced by using bracing. Where m = the mass of the building and k = the rigidity of the building, the natural period T of the building is
T = 2 × π × √ (M / k)
Is required. As the natural period of the building becomes smaller, it approaches the dominant period of the earthquake, that is, the period of the main seismic wave propagating to the ground through the ground, and the risk of the building resonating increases. Therefore, it is not desirable to increase the strength of the brace extremely.
[0005]
Next, the idea of giving a building a damping function to attenuate the vibration of the building during an earthquake is also known. In order to give a building a damping function, there is a brace that uses a damping device such as a viscoelastic damper or a viscous damper. FIG. 5 shows an example in which a brace 46 having an attenuation device 50 is coupled to the diagonal position of the frame formed by the columns 40 and the beams 42. When the brace 46 having such a damping device 50 is used, the resistance force F is given as a damping force, and F = C × V. Where C = attenuation coefficient of the attenuation device and V = speed at which the attenuation device moves. When the brace 46 configured as described above is used, since the attenuation device 50 does not affect the natural period of the building, the resistance to earthquake is improved. However, since the resistance to earthquakes is proportional to the relative speed between the upper and lower layers, it does not increase rigidity, and resistance is exerted to forces with a slow speed like typhoons, in other words, with a long vibration cycle. However, there is a difficulty in deforming the building.
[0006]
Therefore, a seismic control frame disposed in a frame composed of a foundation, a beam, and a bearing wall, and the seismic control device incorporated in the frontal rectangular frame of the seismic control frame is the above-mentioned frame. It consists of an oil damper that pivots the rod end on the upper part, and a damper mounting frame that stands up from the lower part of the axle frame. The rear end of the cylinder of this oil damper is pivoted on the upper end of the damper mounting frame By adopting a structure, there has been proposed a seismic control frame that is capable of preventing the deformation of a building during a typhoon and adding a damping force proportional to the speed to increase earthquake resistance (for example, a patent) Reference 1).
[0007]
[Patent Document 1]
Japanese Patent Laid-Open No. 2002-138703
[Problems to be solved by the invention]
According to the invention described in Patent Document 1, since many members such as a damping device including an oil damper, a damper mounting frame, and a plurality of turnbuckles are required, there is a problem that a large space is required for mounting. In other words, if there is a space limitation, that is, if sufficient space cannot be secured, a member with sufficient rigidity to mount the damper cannot be placed, and expected performance is expected. There is a difficulty that you can not do. Further, since the configuration is complicated, there is a problem that the cost is increased.
[0009]
The present invention has been made to solve the above-described problems of the prior art, and even if the space for installation is limited, the building is prevented from being deformed during a typhoon and proportional to the speed. An object of the present invention is to provide a low-cost bracing with a simple configuration that can simultaneously add a damping force to increase an earthquake resistance.
[0010]
[Means for Solving the Problems]
The invention according to claim 1 is a rigid member provided with a connecting portion with a building structure at both ends, an attachment member extending along the rigid member from one end portion of the rigid member, and the other end portion of the attachment member And a viscoelastic member that generates a damping force against the relative displacement between the rigid member and the accessory member.
The total of the rigidity of the rigid material and the rigidity of the viscoelastic member helps to increase the rigidity of the building against strong winds such as typhoons. With respect to vibration during an earthquake, the building's proof strength is improved by generating damping force with the above-mentioned rigidity and viscoelastic member.
[0011]
According to a second aspect of the present invention, in the first aspect of the present invention, the rigid member is a rod, the accessory member is a cylindrical member that covers the outer periphery of the rod, and the viscoelastic member is the rod and cylinder. A cylindrical space formed between the cylindrical members is filled.
[0012]
The invention according to claim 3 is the invention according to claim 1, wherein the rigid material is a plate-shaped member, and the accessory member is composed of a pair of plate-shaped members arranged with the plate-shaped rigid material interposed therebetween, The viscoelastic member is composed of a pair of viscoelastic members filling a space in which the planes of the plate-like rigid member and the plate-like auxiliary member face each other.
[0013]
According to a fourth aspect of the present invention, in the first, second, or third aspect of the invention, the viscoelastic member is made of viscoelastic rubber.
The invention according to claim 5 is characterized in that, in the invention according to claim 1, attachment plates to the building structure are integrally formed at both ends of the rigid member.
[0014]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of bracing according to the present invention will be described below with reference to the drawings.
The embodiment shown in FIG. 1 is an example of a brace having a cylindrical structure in which a brace and a viscoelastic rubber damper are combined. In FIG. 1, the bracing is performed as a rod 10 as a rigid member provided with a mounting plate 16 that is a connecting portion with a building structure at both ends, and an attachment member extending along the rod 10 from one end of the rod 10. The cylindrical member 12 is provided. The cylindrical member 12 is put on the outer peripheral side of the rod 10 over 1/2 or more of the length direction of the rod 10. The rod 10 is a round bar, that is, a cylindrical member, and the cylindrical member 12 is a cylindrical member inserted on the outer peripheral side of the rod 10. There is a gap between the rod 10 and the cylindrical member 12. The other end portion of the cylindrical member 12 is a large diameter portion 12, and a part of the portion of the rod 10 corresponding to the large diameter portion 12 of the cylindrical member 12 is also a large diameter portion 11. A cylindrical space is formed between the large diameter portions 12 and 11, and the cylindrical space is filled with a cylindrical viscoelastic member 14. The viscoelastic member 14 is made of, for example, viscoelastic rubber. The viscoelastic member 14 is coupled to the rod 10 and the cylindrical member 12 by means that does not impair the viscoelasticity, for example, adhesion.
[0015]
In this way, the viscoelastic member 14 is interposed in the cylindrical space formed between the other end portion of the cylindrical member 12 as the attachment member and the rod 10 as the rigid member, so that the rod 10 and the cylinder The viscoelastic member 14 generates a damping force with respect to the relative displacement with the shaped member 12. The mounting plates 16 at both ends of the rod 10 are formed in a flat plate shape, and a mounting hole 18 is formed at the center of the flat plate. The brace constructed in this manner is a frame structure of a building structure in which the mounting plates 16 at both ends are formed by pillars 40 and beams 42 as shown in FIGS. Are connected to each other, in other words, between the intersections of the columns 40 and 42 by bolts and nuts or by pins. Therefore, the bracing with a damping function is fixed in an oblique posture.
[0016]
By using the bracing with a damping function described above in a manner as shown in FIGS. 3 to 5 in order to reinforce the building structure, the rigidity of the building structure is improved, and the resistance against earthquakes and the like by the damping function An improvement effect can be obtained.
The rigidity of the building against strong winds such as typhoons can be obtained by adding the rigidity of the rod 10 and the rigidity of the viscoelastic member 14 made of viscoelastic rubber or the like. In this case, assuming that the area of the rod 10 is A, the length is L, and the Young's modulus is E, the rigidity K _{b of the} rod 10 is
K _b = E × A / L
And the rigidity of the viscoelastic rubber is K (ω). The value of K (ω) is provided by the rubber manufacturer. The total stiffness is K = K _b + K (ω). Further, the resistance force due to the rigidity K is F _b = K × δ, where δ is the displacement between the layers of the building.
[0017]
The attenuation function for earthquakes is as follows. Increases building strength by generating damping force of viscoelastic damper along with rigidity. Seismic force is input from pins or bolts through attachment holes 18 formed in attachment plates 16 at both ends of the brace. For this reason, when the rod 10 is extended and a relative displacement occurs between the rod 10 and the cylindrical member 12 which is the outer tube, a damping force is generated in the viscoelastic rubber 14 when a relative speed is generated. The damping force generated by the viscoelastic rubber 14 is output to the outside again from the mounting plates 16 at both ends. The viscoelastic rubber 16 generates a damping force Fd = C (ω) × u corresponding to the velocity u between the buildings. Here, C (ω) is a damping coefficient of the viscoelastic rubber 16, and a value is provided by the rubber manufacturer. Further, instead of the viscoelastic rubber 16, low yield point steel or lead, which is a material having similar damping characteristics, may be used, and the same effect as when the viscoelastic rubber 16 is used can be obtained.
[0018]
Next, another embodiment of bracing according to the present invention will be described with reference to FIG. This embodiment is different from the embodiment shown in FIG. 1 in that the rigid member and the accessory member have a flat plate shape. In FIG. 2, reference numeral 20 denotes a rigid member made of a plate-like member, and reference numeral 22 denotes an accessory member made of a plate-like member. Both ends of the rigid member 20 in the length direction are integrally connected to a flat mounting plate 30 that is a connecting portion with a building structure. A mounting hole 32 is formed in the center of each mounting plate 30. The attachment member 22 is composed of a pair of members that oppose the rigid member 20 and sandwich the rigid member 20 from both sides. In addition, one end of the pair of attachment members 22 is integrally coupled to the mounting plate 30. The pair of attachment members 22 extends along the rigid member 20 over ½ or more of the length of the rigid member 20. There is a gap between the rigid member 20 and each attachment member 22. The tip of each attachment member 22 is a stepped portion 26, and a large gap is generated between each stepped portion 26 and the rigid material 20. A viscoelastic member 28 made of viscoelastic rubber fills a part of these large gaps, and thus a space in which the planes of the plate-like rigid member 20 and the plate-like accessory member 22 face each other. The viscoelastic member 28 is coupled to the rigid member 20 and the accessory member 22 by means that does not impair its inelasticity, for example, adhesion.
[0019]
As shown in FIGS. 3 to 5, the bracing bar with a damping function configured as described above uses a mounting hole 32 for the mounting plates 30 at both ends thereof, and between the intersections of the columns 40 and the beams 42, as shown in FIGS. And are fixed in an oblique posture. By using in this manner, it is possible to improve the rigidity of the building structure and to improve the proof strength against earthquakes and the like due to the damping function.
[0020]
Improvement in the rigidity of the building against strong winds such as typhoons is brought about by the plate-like rigid material 20 having rigidity and the pair of viscoelastic members 28. As in the embodiment shown in FIG. 1, when the area of the rigid member 20 is A, the length is L, and the Young's modulus is E, the rigidity K _b of the rigid member 20 is
K _b = E × A / L
And the rigidity of the viscoelastic member 28 is K (ω). Therefore, the total rigidity is K = K _b + K (ω), and the rigidity is improved. Also, the resistance force F due to the stiffness K is δ as the displacement between the layers of the building.
F _b = K × δ.
[0021]
The attenuation function for earthquakes is as follows. With respect to earthquakes, the yield strength of the building is improved by the generation of damping force of the viscoelastic member 28 together with the rigidity. The seismic force is input from a pin or bolt through the mounting holes 32 of the mounting plates 30 at both ends. For this reason, the rigid material 20 which is a rigid body is extended, and accordingly, relative displacement between the rigid material 20 and the upper and lower attachment members 22 occurs. As a result, a relative speed is generated between the rigid member 20 and the attachment member 22, and the viscoelastic member 28 is deformed to generate a damping force Fd = C (ω) × u corresponding to the speed u between the layers of the building. The damping force generated by the viscoelastic member 28 is output to the outside from the attachment plates 30 at both ends again. As a material of the viscoelastic member 28, viscoelastic rubber may be used, or low yield point steel or lead which is a material having the same damping characteristics as the viscoelastic rubber may be used.
[0022]
【The invention's effect】
According to the present invention, the total of the rigidity of the rigid material and the rigidity of the viscoelastic member is useful for increasing the rigidity of the building against strong winds such as typhoons. The generation of damping force has the effect of improving the building strength. In addition, the brace according to the present invention has the above-described effect, and a rigid member provided with a connecting portion with a building structure at both ends, and an attachment member extending along the rigid member from one end of the rigid member. The viscoelastic member is provided between the other end of the attachment member and the rigid member, and has a viscoelastic member that generates a damping force against the relative displacement between the rigid member and the attachment member. be able to. Furthermore, the desired effect can be obtained even when the installation space is limited, and a low cost bracing can be obtained.
[Brief description of the drawings]
FIG. 1 is a partial cross-sectional front view showing an embodiment of bracing according to the present invention.
2A and 2B show another embodiment of bracing according to the present invention, in which FIG. 2A is a front view, and FIG. 2B is a partial sectional side view.
FIG. 3 is a front view showing an example of a conventional bracing together with a specification mode.
FIG. 4 is a front view showing another example of a conventional bracing together with a specification mode.
FIG. 5 is a front view showing still another example of a conventional bracing together with a specification mode.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 10 Rod 12 as rigid material Cylindrical member 14 as attachment member Viscoelastic member 16 Mounting plate 20 Rigid material 22 Attachment member 28 Viscoelastic member 30 Mounting plate

Claims (5)

A brace used to reinforce a building structure, comprising a rigid member provided with a connecting portion to the building structure at both ends, and an attachment member extending along the rigid member from one end of the rigid member, A brace having a viscoelastic member that is interposed between the other end portion of the attachment member and the rigid member and generates a damping force against the relative displacement between the rigid member and the attachment member. The rigid material is a rod, the attachment member is a cylindrical member placed on the outer peripheral side of the rod, and the viscoelastic member fills a cylindrical space formed between the rod and the cylindrical member. The brace according to claim 1. The rigid member is a plate-like member, the accessory member is composed of a pair of plate-like members arranged with the plate-like rigid member interposed therebetween, and the viscoelastic member is a plane of the plate-like rigid member and the plate-like accessory member. The brace of Claim 1 which consists of a pair of viscoelastic member which has filled the space which mutually opposes. The brace according to claim 1, 2 or 3, wherein the viscoelastic member is made of viscoelastic rubber. The brace according to claim 1, wherein attachment plates to the building structure are integrally formed at both ends of the rigid member.

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