JP2006138170A - Boundary beam damper - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a boundary beam damper having a simplified construction which can be built more easily. <P>SOLUTION: In a boundary beam damper functioning as a damping member erected to the form of a short-span beam between structural bodies 7 when a relative displacement occurs between these structural bodies, any vibration energy transmitted to the bodies can be absorbed by the damper; a damping member 3 is capable of making a plastic deformation at the center portion in its length direction with a hollow steel pipe 1 as a main body; and inside of the hollow steel pipe is filled with concrete 6 at both the end portions and the steel pipe as highly rigid bracket portions 8 is connected together into the structural bodies as a totally integrated body. An opening 4 is formed as a means of adjusting the plastic deformation performance on the peripheral surface of the damping member 3. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a damping damper installed in a structure, and more particularly to a boundary beam damper installed in the form of a short span beam.

Various types of damping dampers installed in the structure have been proposed and put into practical use. However, Patent Document 1 proposes a boundary beam damper using plastic deformation of a steel material. This is installed in the form of a short span beam between the core walls as the seismic walls in the super high-rise RC building, or between the core wall and the other frame. By wrapping both ends with concrete and integrally joining to the frame, when the frame on both sides is relatively deformed during an earthquake, the center part of the H-shaped steel is plastically deformed to obtain a vibration damping effect It is a thing.
Japanese Patent Laid-Open No. 2003-90082

  However, since the boundary beam damper shown in Patent Document 1 needs to be constructed as a strong reinforced concrete bracket part at both ends of the H-shaped steel, the required amount of reinforcement in the bracket part is great. In some cases, it is necessary to further cover the bracket portion with a steel plate or to introduce prestress into the bracket portion. Therefore, the structure is too complicated and its construction is not always easy.

  In view of the above circumstances, an object of the present invention is to provide a boundary beam damper that is simple in structure and easy to construct.

  The invention according to claim 1 is a boundary that absorbs vibration energy by functioning as a damping damper when relative displacement occurs between the housings by erection in the form of a short span beam between the housings in the structure. It is a beam damper, a hollow steel pipe as a main body, and a longitudinally central part as a damper part that can be plastically deformed, and both ends of the steel pipe as a highly rigid bracket part by filling concrete inside thereof, Each of the bracket portions is integrally joined to the housing.

  According to a second aspect of the present invention, in the boundary beam damper according to the first aspect of the present invention, an opening for adjusting the plastic deformation performance is formed on the peripheral surface of the damper portion.

  According to the boundary beam damper of the first aspect of the invention, the center portion of the steel pipe functions as a damper by itself and an excellent vibration control effect is obtained, and it is only necessary to fill both ends of the steel pipe with concrete. A highly rigid bracket part is formed, so the configuration is simplified compared to conventional boundary beam dampers mainly made of H-shaped steel, and it is much easier because bar arrangement and formwork for the bracket part can be omitted. It is possible to construct it.

  The boundary beam damper according to the second aspect of the present invention is such that an opening is formed in the peripheral surface of the steel pipe as the damper portion, and the plastic deformation performance as the damper is easily and freely adjusted by adjusting the size of the opening. It is possible to adjust to.

  1 to 3 show a boundary beam damper according to an embodiment of the present invention. The boundary beam damper of this embodiment is a short-span beam, for example, between core walls in an ultra-high-rise RC building or between a core wall and another frame, similar to that shown in Patent Document 1 described above. However, the conventional boundary beam damper has a H-shaped steel as a main component and its both ends are wound with reinforced concrete to form a bracket portion, whereas the boundary of this embodiment The beam damper has a square steel pipe with a substantially square cross section as a main component, and a bracket portion is formed by filling concrete inside both ends.

  That is, the boundary beam damper of the present embodiment employs, for example, a steel pipe 1 having a length of about 2 m and a cross-sectional dimension of about 750 mm × 750 mm, and by providing two partition walls 2 in the vicinity of the center portion thereof. The central part between the partition walls 2 is allowed to function as the damper part 3 as it is.

  Openings 4 are formed in the upper surface 3a and the lower surface 3b of the four peripheral surfaces at the center of the steel pipe 1 as the damper portion 3, and the damper portion 3 is adjusted by adjusting the size of the openings 4. In other words, the appropriate plastic deformation performance required as a damper is ensured. That is, if the steel pipe 1 having a simple closed cross section without forming such an opening 4 is used, the rigidity of the damper section 3 is excessive and may not function effectively as a damper. Desirable to cut off part of the upper surface 3a and the lower surface 3b to form an appropriately sized opening 4 to moderately reduce the rigidity thereof, thereby effectively functioning as a damper during an assumed earthquake The plastic deformation performance is given. And by forming such an opening part 4, while the part left on both sides of these opening parts 4 is equivalent to the flange in H-section steel, the side surface 3c of the both sides of the damper part 3 is each H Accordingly, the boundary beam damper according to the present embodiment can obtain the same vibration control effect as that of the conventional boundary beam damper mainly composed of H-shaped steel because the side surface 3c is plastically deformed. It has become a thing.

  Further, concrete filling ports 5 are respectively formed as circular openings on the upper surfaces of both ends of the steel pipe 1, and the concrete 6 is integrated with the casing 7 such as a core wall into the both ends of the steel pipe 1 from the filling ports 5. By placing and filling in such a manner, the bracket portions 8 having a robust concrete-filled steel pipe structure are formed at both ends of the steel pipe 1. Then, by fixing anchor bars 9 embedded in the concrete 6 to the frame 7, both end portions of the steel pipe 1 are securely and firmly integrated with the frame 7 via the anchor bars 9 and the concrete 6, thereby the boundary beam. The damper is constructed as a short span beam between the housings 7.

  In the boundary beam damper of the present embodiment, when the housings 7 on both sides are relatively displaced at the time of an earthquake, the bracket portions 8 on both ends behave integrally with the housings 7 respectively. The damper portions 3 between the eight, particularly the side surfaces 3c thereof, are plastically deformed to absorb vibration energy, and an excellent damping effect is obtained.

  In addition, since the conventional boundary beam damper described above forms a bracket portion by wrapping reinforced concrete around both ends of the H-shaped steel, rebar placement work and formwork work for the bracket portion are necessary. The boundary beam damper of the embodiment only needs to fill the both ends of the steel pipe 1 with the concrete 6, whereby the steel pipe 1 itself has not only tensile strength and shear strength, but also confinement that restricts deformation of the internal concrete 6. The bracket portion 8 having a robust concrete-filled steel pipe structure that exhibits the effect can be formed. Therefore, when constructing the boundary beam damper according to the present embodiment, no reinforcement is required other than the anchor bar 9, and the steel pipe 1 itself becomes a formwork, so that no formwork is required. The construction can be greatly simplified compared to

  In the above embodiment, the plastic deformation performance is adjusted by forming the opening 4 in the upper surface 3a and the lower surface 3b of the damper portion 3, but instead of forming such an opening 4, Alternatively, in addition to this, it is also possible to adjust the plastic deformation performance by adjusting the material, thickness, and shape of the damper portion 3. For example, openings and slits may be formed on both side surfaces 3 c of the damper portion 3. Alternatively, it may be possible to adopt mild steel or extra mild steel as the material.

  Moreover, the cross-sectional shape and dimension of the steel pipe 1 in the said embodiment are only examples, and it is in various conditions, such as the performance and installation position requested | required as a boundary beam damper, the structure of the housing 7 which should join this, and its construction procedure. Accordingly, it is needless to say that the specific configuration of details such as the shape and size of each part, the form of joining to the housing 7 and the like can be appropriately changed in design, for example, the partition wall 2 and the concrete in the above embodiment, for example. If construction is possible without providing the placement port 5, they may be omitted.

It is a sectional side view which shows the boundary beam damper which is embodiment of this invention. It is a top view (II-II line view in FIG. 1) same as the above. FIG. 3 is a front sectional view of the bracket portion (a) (a sectional view taken along line IIIa-IIIa in FIG. 1), and (b) is a sectional front view of the damper portion (viewed along line IIIb-IIIb in FIG. 1). ).

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Steel pipe 2 Bulkhead 3 Damper part 3a Upper surface (circumferential surface)
3b Lower surface (circumferential surface)
3c Side surface (circumferential surface)
4 Opening 5 Filling Port 6 Concrete 7 Frame 8 Bracket 9 Anchor Anchor

Claims (2)

A boundary beam damper that functions as a vibration control damper and absorbs vibration energy when a relative displacement occurs between the casings by erection in the form of a short span beam between the casings in the structure,
A hollow steel pipe is the main part, and the lengthwise central part is a plastically deformable damper part, and both ends of the steel pipe are filled with concrete inside to form a highly rigid bracket part. Boundary beam damper characterized by being joined together. The boundary beam damper according to claim 1,
A boundary beam damper characterized in that an opening for adjusting plastic deformation performance is formed on the peripheral surface of the damper portion.

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