JP2003028235A - Axial force type vibration control device usable in both earthquake and wind - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an axial force type vibration control device usable in both an earthquake response and a wind response. SOLUTION: The axial force type vibration control device uses a round bar of superplastic metallic material as an energy absorbing member, and reduces or suppresses vibration of a structure through axial deformation. The round bar of superplastic metallic material is machined to a small diameter at a middle portion except pressurized portions at both ends to form an energy absorbing portion with axial deformation, and the pressurized portions at both ends are joined to respective mounting plates on both sides. An outer circumference of the axial-deformation energy absorbing portion of the energy absorbing member machined to the small diameter is mounted with a buckling stiffening member in a structure prevented from hindering axial deformation, and an outer circumference of the buckling stiffening member is further restrained by a buckling stiffening tube.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention, as an energy absorbing member, has high strain rate sensitivity in material strength, stable strength against temperature rise in the energy absorbing process, and hardly undergoes work hardening due to plasticization. A superplastic metal material that does not occur and has a sufficiently large deformation performance is used to absorb plastic energy by deforming (axially deforming) it with axial force to reduce structural vibration (or vibration, the same applies below). A shaft that belongs to the technical field of an axial force type vibration damping device that suppresses or suppresses, and further, can be used substantially for both seismic response and wind response, and exerts necessary and sufficient vibration damping (or vibration damping, the same applies hereinafter). The present invention relates to a force type vibration damping device.

[0002]

2. Description of the Related Art Conventionally, vibration damping devices for absorbing and mitigating vibrations of building structures are roughly classified into (a) vibration damping devices for the purpose of reducing or suppressing shaking caused by an earthquake, and (b) Two types are used, namely, a vibration damping device that reduces or suppresses shaking caused by wind or the like and improves habitability.

In the field of the vibration control device of the hysteresis system for the seismic force described in (a) above, a vibration control device using ultra-low yield point steel as an energy absorbing member or a lead-filled type using lead has been conventionally used. Many seismic control devices are used.

(C) In particular, regarding the classification of axial force type vibration damping devices used for braces and the like, first, Japanese Patent Laid-Open No. 2000-
In Japanese Patent No. 213200, a damper member made of ultra-soft steel is used as a so-called "energy absorbing portion for axial deformation" by using a flat plate shape or a cross section having a cross shape, and making the cross-sectional area of the central portion smaller than both end portions. However, a "seismic control structure" is disclosed in which the outer periphery of the damper member is stiffened by a buckling prevention tube or the like, and an axial force is applied to both ends of the damper member.

(D) Further, Japanese Patent Laid-Open No. 2000-144930.
In the official gazette, a flat plate made of ultra-soft steel is properly inserted in a diagonal direction of a buckling stiffening tube formed of a square steel tube, and a stiffener for stiffening is arranged in the other diagonal direction. A "seismic damping device" having a structure in which an axial force is applied to both ends of a flat plate is disclosed.

(E) In the vibration damping device used for the purpose of reducing the vibration response of a high-rise building due to the wind load of the above (b), a viscous body or a viscous material (hereinafter referred to as an energy absorbing member) has been conventionally used. Many damping devices using viscous materials are widely known and used. The vibration damping device using these viscous materials is generally excellent in deformation performance.

(F) In addition, recently, as a superplastic metal material suitable for an energy absorbing member of a vibration damping device, for example, "Zinc-aluminum alloy (Zn-Al alloy)" disclosed in Japanese Patent Laid-Open No. 11-222643. Is also known to be used. It is known that this superplastic metal material does not cause work hardening and strain deterioration, and thus has stable seismic damping performance for a long period of time.

(G) Therefore, the applicants of the present application have proposed a vibration damping device for both earthquake and wind using the above-mentioned "zinc-aluminum alloy (Zn-Al alloy)" as an energy absorbing member in Japanese Patent Application No. 2000-. Japanese Patent No. 386068 and Japanese Patent Application No. 2001-37
No. 213 publications.

[0009]

[Problems to be Solved by the Invention] (I) Above (c)
Extremely mild steel (extremely low yield point steel) for the damper member as shown in (d)
Axial force type vibration damping device using is subjected to a plastic strain history due to an earthquake or the like, and the yield load increases due to work hardening of the ultra-soft steel itself. For this reason, after the second time, the elastic region of the ultra-soft steel becomes long, and the energy absorption performance decreases, and the energy absorption performance becomes unstable. Extremely mild steel also
When subjected to plastic strain, mechanical properties deteriorate, making it difficult to understand the performance during continuous use, and it becomes impossible to maintain the initial vibration damping performance.Therefore, energy absorption members (extremely low yield point steel) are often used. ) Need to be replaced, etc.

(II) In the case of a lead-filled type vibration damping device using lead, the room temperature strength of lead itself is low, and therefore vibration damping performance equivalent to that of a vibration damping device using ultra-low yield point steel is realized. To do so requires a large amount of lead. However, since lead has a large specific gravity, the weight of the entire vibration damping device eventually increases, the handling becomes poor, and the load on the structure is large. Furthermore, since lead is a toxic metal, its use is not preferable for environmental protection. In addition, as for the lead-filled type vibration damping device using lead, a mechanism that fills lead and causes equal volume deformation has been proposed, but in reality there is elastic deformation of the stiffening member, Realizing volume deformation is difficult. Moreover, lead conducts heat with respect to heat generated by absorbing energy,
The ability to dissipate is poor and the strength is significantly reduced during repeated deformation. Therefore, sagging is likely to occur, and a gap between the force-applying member that did not exist in the initial stage of encapsulation occurs, resulting in slip-type plastic strain history and unstable vibration resistance. There is.

(III) Next, the vibration damping device using the above "viscous material" has a very large temperature dependency of various characteristics. Due to the heat generation in the energy absorption process, the rigidity, the damping characteristic, etc. are remarkably lowered due to the temperature rise of several tens of degrees Celsius, so that the damping characteristic is sharply lowered. For example, in summer and winter, "viscous material"
Since the temperature to which is exposed differs greatly, the vibration damping performance also changes significantly. Therefore, as a place to install the viscous damping device on the structure, it is not suitable around the outer wall where the temperature changes drastically, and is limited to a place near the living space where the temperature changes little. Since the “viscous material” generally has low material strength, the size of the apparatus itself increases. Inevitably, there is a problem that the effective installation space of the structure is further limited.

(IV) Next, the superplastic metal material "zinc-aluminum alloy (Zn-Al alloy)" disclosed in Japanese Patent Laid-Open No. 11-222643 is used as the energy absorbing member of the vibration damping device. If so, the following considerations must be overcome. That is, since this kind of superplastic material does not cause work hardening and strain deterioration, stable vibration resistance performance continues for a long period of time. On the other hand, the superplastic material "fine-temperature high-speed superplastic alloy" having a fine crystal grain structure loses the stability of the metal structure, so "welding" is used as the joining means with the force transmitting member (or force jig). It is impossible to carry out a processing method involving a large heat input such as. In addition, the superplastic material "room-temperature high-speed superplastic alloy" has a problem that "strain concentration" is more likely to occur when local buckling occurs compared to low yield point steel, and the conventional buckling stiffening method cannot be applied. . Furthermore,
Although not as good as lead, superplastic materials lose their material strength due to heat generation during energy absorption, so heat dissipation measures are an important issue.

(V) It should be noted that one of the fatal drawbacks of the current vibration control technology is that the vibration control device of the history system for earthquake response and the vibration control device of viscous system for wind response are used. There is no choice but to use them according to their purpose. There is no one type of damping device that can be used for both earthquakes and winds, and exerts a sufficiently large damping effect. The reason is as follows.
For example, if a vibration damping device using ultra-low yield point steel (extremely soft steel) is designed to be plasticized against earthquake external force, priority is given to the purpose of ensuring stable deformation performance of the hysteretic energy absorbing material. As a result, the extremely low yield point steel is used as it is in the elastic region in the extremely small amplitude region such as wind load for the purpose of improving the habitability, and the energy absorbing ability can hardly be exhibited. Conversely, if, for example, a vibration control device using ultra-low yield point steel is designed to be plastic for a habitability and subject to wind loads, it will experience seismic response with a larger amplitude and be plasticized. Then, as described above, in addition to the limit of the deformation performance of the hysteresis type energy absorbing material, in terms of function, the strength increases thereafter due to work hardening, so that only elastic behavior is no longer exhibited with respect to wind load. There is a problem that the effective energy absorption capacity cannot be exerted and so on.
Therefore, there is a problem that the energy absorbing member must be replaced. In other words, the vibration control device of the hysteresis system using ultra-low yield point steel etc. has both functions for the purpose of reducing the wind response for the purpose of improving the habitability of the building or reducing the seismic response of the building. It is difficult to combine them.

(VI) In the case of the vibration damping device using the above "viscous material", the material strength has a strain rate dependence and the deformation performance is better than that of the hysteresis material. The energy absorption performance can be exhibited against wind load for the purpose of improving habitability and against load during a large earthquake, but it has the following drawbacks. In a large-amplitude region at the time of a large earthquake, the proof stress is drastically reduced due to heat generation at the time of energy absorption, so that the vibration damping performance is unstable. In addition, the stress level is lower than that of ultra-low yield point steel (extremely mild steel), and because of the problem of proof stress reduction as described above, the required number of vibration damping devices becomes extremely large when seismic response is targeted. It becomes very difficult to secure the installation space for the vibration damping device. In other words, it is difficult for a viscous damping device to have both damping functions for the purpose of improving the habitability of the building and for reducing the seismic response of the building.

(VII) Most of the conventional axial force type vibration damping devices have a so-called hysteresis type structure and do not have a vibration damping function that can be used for both earthquake and wind.

(VIII) An object of the present invention is to use the above-mentioned "superplastic metal material" as an energy absorbing member (damper member) of a vibration damping device, and to overcome all the problems that occur during its use. It is to provide a shaking device. The next object of the present invention is excellent in deformability, hardly causing work hardening due to plasticization, and using "superplastic metal material" having high strain rate sensitivity as an energy absorbing member,
An axial force type vibration control device that has been improved and devised to make the best use of its material characteristics, and in particular it has an excellent vibration control effect against two types of vibration, wind response and seismic response of building structures, and the vibration control function is stable for a long period of time. It is also an object of the present invention to provide an axial force type vibration damping device that can be used for both earthquakes and winds, and does not require replacement of the energy absorbing member even if it receives strain history. The ultimate object of the present invention is to use a “superplastic metal material”, which has a vibration damping function for both small deformation due to wind load and large deformation due to seismic load, as an energy absorbing member while having an extremely simple structure. It is to provide an axial force type vibration damping device that can be manufactured at low cost and can be used for both earthquake and wind.

[0017]

As a means for solving the above-mentioned problems of the prior art, the axial force type vibration damping device according to the invention of claim 1 which can be used for both earthquake and wind is used as an energy absorbing member. Material strength has high strain rate sensitivity,
The strength is stable against the temperature rise in the energy absorption process, the work hardening due to plasticization hardly occurs, and the superplastic metal material having a sufficiently large deformation performance is used in the shape of a round bar,
It is an axial force type vibration damping device that reduces or suppresses the vibration of a structure by axially deforming it. Energy absorbing parts are formed, and the force applying parts at both ends are joined to the mounting plates on both sides, respectively, and the buckling is performed on the outer circumference of the axial deformation energy absorbing part machined into a small diameter of the energy absorbing member. The stiffening member is arranged in a structure that does not hinder axial deformation, and the outer circumference of the buckling stiffening member is constrained by a buckling stiffening tube. Is joined to an axial force member such as a brace that transmits the force as an axial force.

According to a second aspect of the invention, in the axial force type vibration damping device capable of being used for both the earthquake and the wind according to the first aspect, male force portions projecting in the axial direction are provided at the force applying portions at both ends of the energy absorbing member. The male screw portion and the mounting plates on both sides are joined to each other through a connecting member that is screw-joined, and the male screw portion is arranged on the outer periphery of the shaft deformation energy absorbing portion machined into a small diameter. The buckling stiffening member is configured by a split steel pipe having a thickness that fills a gap with the buckling stiffening pipe, and the buckling stiffening pipe is also a steel pipe.

According to a third aspect of the present invention, in the axial force type vibration damping device that can be used for both earthquake and wind according to the first or second aspect, the energy absorbing member is a zinc-aluminum alloy. .

[0020]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the axial force type vibration damping device according to the invention described in claims 1 to 3 which can be used for both earthquake and wind will be described below with reference to FIGS. 1 to 3.

In the axial force type vibration damping device shown in FIG. 1, as the energy absorbing member 1, the material strength has high strain rate sensitivity, the strength is stable against temperature rise in the energy absorbing process, and the plasticity is high. A superplastic metal material that does not cause work hardening due to aging and has a sufficiently large deformability, more specifically, the "zinc-aluminum alloy" disclosed in the above-mentioned JP-A-11-222643 (claim The invention according to item 3) is used in the shape of a round bar.

The round rod-shaped superplastic metal material is used as a means for facilitating and concentrating the axial deformation, and by cutting the central portion except the force applying portions 1b, 1b at both ends thereof into a small diameter by a lathe or the like, The energy absorbing portion 1a in which the axial deformation due to the axial force is concentrated is formed to have an appropriate length. In that case,
A boundary portion 2 between the force applying portion 1b and the energy absorbing portion 1a is rounded with a radius sufficiently large so that stress concentration does not occur. The energy absorbing member 1 will be described in detail. When the force applying portion 1b has an outer diameter of about 50 mm, the small-diameter shaft deformation energy absorbing portion 1a has an outer diameter of 1 mm.
The length is about 5 mm to 20 mm, and the effective length in the axial direction is about 200 mm.

Force portions 1b at both ends of the energy absorbing member 1,
1b is joined to the mounting plates 3 and 3 on both sides, respectively. By joining the mounting plates 3 with an axial force member such as a brace, the seismic response of the structure or the like is input to the vibration damping device as an axial force. It is supposed to do.

As a concrete means thereof, a male screw portion 4 projecting in the axial direction is formed in the force applying portion 1b at both ends of the energy absorbing member 1.
However, as in the case of lathe processing of the round rod-shaped superplastic metal material, it is provided by threading. The male screw portion 4 is connected via a double nut 8 with a connecting member 5 which is screwed and strongly tightened so as not to rattle, and a connecting pipe 9 which is connected to the connecting member 5 in series by welding or the like. Are joined to the mounting plates 3 on both sides (the invention according to claim 2). In other words, as described above, the superplastic metal material "room temperature high-speed superplastic alloy" loses the stability of the metal structure, so that the joining means with the force-transmitting member (or force jig) that transmits force is like "welding". As described above, the problem that a processing method involving a large heat input cannot be carried out is solved.

Next, a split steel pipe 6 is provided as a buckling stiffening member on the outer periphery of the axial deformation energy absorbing portion 1a machined into a small diameter of the energy absorbing member 1 and the axial deformation energy absorbing portion 1a.
It is arranged in a structure that does not hinder the axial deformation of a. Furthermore,
The outer circumference of the buckling stiffening member 6 is tightly restrained by the buckling stiffening tube 7. A normal steel pipe is used for the buckling stiffening pipe 7, and the split steel pipe 6 as the buckling stiffening member is a material for filling a gap with the inner surface of the buckling stiffening pipe 7. A steel pipe having a thickness suitable for the purpose is used.

Incidentally, the overall size of the axial force type vibration damping device shown in FIG. 1 is set such that the dimension between the left and right mounting plates 3 and 3 is about 50 to 60 cm.

Therefore, as an application form of the axial force type vibration damping device, as illustrated in FIG. 4, a brace 12 arranged in a diagonal direction in a plane surrounded by a column 10 and a beam 11 is provided at a central portion. The mounting columns 13, 13 fixed to the vertical upper and lower beams 11 and vertically joined to each other are provided at the ends of the divided brace 12, and the left and right mounting columns 13,
One or a plurality of the axial force type vibration damping devices 15 having the above-described configuration are horizontally arranged on the inner side surface of 13, and the respective mounting plates 3 are rigidly connected to the mounting columns 13.

That is, the inter-layer deformation between the upper and lower beams 11, 11 due to the seismic force input to the column-beam structure is prevented by the brace 12.
The mounting column 13 causes the axial force type vibration damping device to act as an axial force (axial deformation) in the horizontal direction.

As a result, the axial deformation is concentrated on the axial deformation energy absorbing portion 1a of the energy absorbing member 1 which is machined into a small diameter,
The deformation performance peculiar to the superplastic metal material efficiently absorbs energy, and the seismic response is reduced or suppressed.

In this case, as a property peculiar to the superplastic metal material, an effective damping function (damping action) is stable for a long period of time against both small deformation due to wind load and large deformation due to seismic load. To work.

[0031]

The axial force type vibration damping device according to the present invention, which can be used for both earthquake and wind, uses the above-mentioned "superplastic metal material" as an energy absorbing member (damper) of the vibration damping device. It is used as a member), overcomes all the problems that occur during its use, and can be provided at a low cost with an extremely simple structure.

According to the present invention, since the "superplastic metal material" which is excellent in deformability, hardly causes work hardening due to plasticization, and has high strain rate sensitivity is used as the energy absorbing member, a building structure is constructed. Axial force type vibration damping device that has excellent vibration damping effect against two types of vibrations, wind response and seismic response, has stable vibration damping function for a long time, and does not require replacement of energy absorbing member even if strain history is received. Is to provide.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional view showing an axial force type vibration damping device according to the present invention.

FIG. 2 is an enlarged view showing the vicinity of a force applying portion of the energy absorbing member of FIG.

3 is a sectional view taken along the line III-III of FIG.

FIG. 4 is an elevational view showing an application example of the vibration damping device according to the present invention.

[Explanation of symbols]

1 Energy absorbing member 1a Energy absorption part 1b Force part 2 border 3 Mounting plate 4 Male screw part 5 ties 6 Buckling stiffening member (divided steel pipe) 7 Buckling stiffening tube 8 double nuts 9 connecting pipes

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Katsumi Tabuchi             4-1, Honmachi, Chuo-ku, Osaka City Stock Association             Takenaka Corporation Osaka Main Store (72) Inventor Kazuo Aoki             4-1, Honmachi, Chuo-ku, Osaka City Stock Association             Takenaka Corporation Osaka Main Store (72) Inventor Yasuaki Sugisaki             1-5-5 Takatsukadai, Nishi-ku, Kobe City, Hyogo Prefecture             Kobe Steel Works Materials Research Center (72) Inventor Koichi Makii             1-5-5 Takatsukadai, Nishi-ku, Kobe City, Hyogo Prefecture             Kobe Steel Works Materials Research Center (72) Inventor Jundo Kushibe             Chiba Prefecture Inzai City 1-5 Otsuka 1 Stock Association             Takenaka Corporation Technical Research Institute F term (reference) 3J048 AA06 AC06 BC09 EA38                 3J066 AA01 AA26 BA03 BB01 BC01                       BD07 BF01 BG01

Claims (3)

[Claims] 1. As an energy absorbing member, the material strength has a high strain rate sensitivity, the strength is stable against a temperature rise in the energy absorbing process, work hardening due to plasticization hardly occurs, and it is sufficiently large. This is an axial force type vibration damping device that reduces or suppresses the vibration of a structure by axially deforming a superplastic metal material with deformability. The central part excluding the force part is machined to a small diameter to form an energy absorbing part for axial deformation, and the force applying parts at both ends are joined to the mounting plates on both sides, respectively. A buckling stiffening member is arranged on the outer circumference of the processed axial deformation energy absorbing portion in a structure that does not hinder axial deformation, and the outer circumference of the buckling stiffening member is constrained by a buckling stiffening tube. That, before Mounting plate on both sides, it is joined to the axial force member of the brace or the like for transmitting the vibration of the structure as axial forces, characterized by axial force damping device capable of combined seismic, wind. 2. An energy absorbing member is provided with a male screw portion projecting in an axial direction at a force applying portion at both ends thereof, and the male screw portion and a mounting plate on both sides are joined to each other via a connecting member screw-joined. The buckling stiffening member arranged on the outer periphery of the axial deformation energy absorbing part that has been machined to a small diameter of the energy absorbing member is composed of a split steel pipe with a thickness that fills the gap with the buckling stiffening pipe. The axial force type vibration damping device according to claim 1, wherein the buckling stiffening pipe is also a steel pipe. 3. An axial-force type vibration damping device according to claim 1 or 2, wherein the energy absorbing member is a zinc-aluminum alloy.