JP4191673B2 - History damper - Google Patents

Description

  The present invention relates to a hysteresis damper that is installed as a brace in a frame of a building frame and also functions as a damper that absorbs vibration energy of the building.

As a history damper that also functions as a brace, one having a core material and a supplementary steel body mounted around the core material is known (see, for example, Patent Documents 1, 2, and 3).
Japanese Utility Model Publication No. 5-57110 JP 2000-081085 A

However, in the invention disclosed in Patent Document 1 described above, a plastic part is provided at the center of the core material. For this reason, a large bending moment is applied to the gusset plate to which the end of the core is attached, and a large-scale gusset plate that can withstand this large bending moment is required, resulting in an increase in manufacturing cost. It was.
Further, in the invention disclosed in Patent Document 2 described above, hysteresis dampers are provided at both ends of the intermediate material, whereby the distance between the plastic portion of each hysteresis damper and the gusset plate is reduced, and the gusset plate The bending moment applied to the material is greatly reduced. However, according to the present invention, two hysteresis dampers and one intermediate material must be prepared, and these members must be joined to each other by welding or the like, resulting in a complicated structure and an increased manufacturing process. There is a problem that the manufacturing cost increases.

  The present invention has been made in view of the above circumstances, and an object thereof is to provide a hysteresis damper that can reduce the bending moment applied to the structural member and can simplify the structure.

The present invention employs the following means in order to solve the above problems.
A hysteresis damper according to the present invention is a hysteresis damper that is installed as a brace in a structural surface of a building frame and also functions as a damper that absorbs vibration energy of the building, and has a yield stress level that is higher than that of the frame. It is formed by a small material, arranged so that one end is joined to a part of the frame and the other end is joined to the other part of the frame, and the core is sandwiched and a pair of stiffening members which are provided between the end portion and the central portion of the core material, and the plastic part are respectively provided between the other end portion and the central portion of the core material, the stiffening The member has a thick part that is in close contact with the central part and a thin part that forms a gap between the plastic part .
According to such a hysteresis damper, since the plastic portions are provided in the vicinity of both ends of the core material, for example, the bending moment applied to the gusset plate (structural member) can be reduced, and the frame The bending moment applied to the columns and beams constituting the structure can also be reduced.
Moreover, since only one core material is sufficient as the main element, the structure can be simplified and the manufacturing process and the manufacturing cost can be reduced.

Furthermore, according to such a hysteresis damper, the central portion of the core material is integrated so that it is pressed evenly by the stiffening member, and the cross-sectional area increases, so that buckling occurs at the central portion. Thus, stable hysteresis characteristics of the damper can be exhibited and shaft rigidity can be greatly increased.

The hysteresis damper according to the present invention may be configured such that rubber is provided between the plastic portion and the stiffening member.
According to such a hysteresis damper, since the unbonded material (rubber) having a thickness of about 1 mm is disposed between the plastic portion and the stiffening member, the deformed plastic portion and the inner surface of the stiffening member are separated from each other. It is possible to prevent frictional heat and noise that may be generated by rubbing.

  According to the hysteresis damper according to the present invention, it is possible to reduce the bending moment applied to the structural member and to achieve the effect of simplifying the structure.

Hereinafter, an embodiment of a history damper according to the present invention will be described with reference to the drawings.
FIG. 7 is a view showing the appearance of the history dampers 3 and 3 installed in the construction surface 2 of the building frame 1. As shown in FIG. 7, the hysteresis dampers 3 and 3 are formed in a substantially C shape, for example, as a pair of braces in the opening 6 surrounded by the columns 4 and 4 and the beams 5 and 5 constituting the frame 1. is set up.

As shown in FIGS. 1 and 2, the hysteresis damper 3 includes a core member 7 and a pair of stiffening members 8 and 8 disposed on the front surface 7 a and the back surface 7 b of the core member 7 as main elements. It is configured.
The core material 7 is a plate-like member having a rectangular shape in plan view formed of, for example, ultra-soft steel, and the yield stress level thereof is the same as that of the columns 4 and 4 and the beams 5 and 5 formed of ordinary steel frames or reinforced concrete. It is small compared. The core member 7 has one end 7c provided substantially at the center of the upper edge of the opening 6 and fixed to the lower surface of the upper beam 5, the other end 7d. The gusset plate 10 disposed at the lower corner of the opening 6 and fixed to the column 4 and the lower beam 5 is coupled to the gusset plate 10 by a high-strength bolt or the like.
Further, plastic portions (yield portions) 7f and 7g are provided in the vicinity of the end portions 7c and 7d of the core material 7 (that is, between the central portion 7e of the core material 7 and the end portions 7c and 7d), respectively. . Both the long sides of the plastic parts 7f and 7g are smaller in width dimension (length in the vertical direction in the drawing) than the end parts 7c and 7d of the core material 7 and the central part 7e of the core material 7. It is cut out.

The stiffening member 8 includes a thick portion 8a provided corresponding to the central portion 7e of the core member 7, and a thin portion provided corresponding to the plastic portions 7f and 7g and the end portions 7c and 7d of the core member 7. And a pair of plate-like members having a rectangular shape in plan view.
Each of the thick part 8a and the thin part 8b has a predetermined thickness in the width direction (vertical direction in the drawing) and the longitudinal direction, and between the opposing thin part 8b and thin part 8b, Spaces S for accommodating the plastic parts 7f and 7g (which are over-expressed in the figure but are actually about 1 to 2 mm) are formed.
As shown in FIG. 2A, which is a cross-sectional view taken along the line I-I of FIG. 1A, and FIG. 2B, which is a cross-sectional view taken along the line II-II of FIG. Is sandwiched between the stiffening member 8 and the stiffening member 8 so that the front surface 7a and the back surface 7b of the central portion 7e are in contact with the inner surface of the thick portion 8a (so as to be in surface contact). In addition, the core member 7 and the stiffening members 8 and 8 are fixed (integrated) to each other.
The portion where the core member 7 and the stiffening members 8 and 8 are in contact (surface contact) is the portion indicated by dots (black dots) in FIG.

For example, when a compressive force (axial force) as shown by a white arrow in FIG. 1A is applied to the hysteresis damper 3 configured in this manner due to the occurrence of an earthquake or the like, the plastic portion 7f of the core member 7 is formed. 7 g is displaced in the diagonally downward left direction along the solid line from the origin of the coordinates shown in FIG. 4 according to the compression force (axial force) at that time. That is, the plastic parts 7f and 7g of the core material 7 having a lower yield stress than the columns 4 and 4 and the beams 5 and 5 constituting the frame 1 yield before the frame 1 and are shown in FIG. By causing the plastic deformation as shown, the vibration energy of the frame 1 is absorbed, and the vibration response of the frame 1 is attenuated. In this case, the central portion 7e of the core material 7 is integrated so as to be evenly pressed by the stiffening member 8 from both the front surface 7a and the back surface 7b, the cross-sectional area is increased, and the plastic portion 7f. The thickness in the width direction is smaller than 7 g, so that stable hysteresis characteristics of the damper can be exhibited without causing buckling in the central portion.
Also, the plastic parts 7f and 7g that have undergone plastic deformation as shown in FIG. 1B are bent at their tips (that is, bent toward the stiffening member 8) as shown in FIG. 2B. The tip of the portion abuts against the inner surface of the thin portion 8b, and the buckling deformation of the plastic portions 7f and 7g is suppressed.

As described above, the hysteresis damper 3 according to the present invention is mainly composed of the single core member 7 and the pair of stiffening members 8 and 8, and can simplify the configuration. The manufacturing process and the manufacturing cost can be reduced.
Further, since the plastic portions 7f and 7g are provided in the vicinity of the end portions 7c and 7d of the core material 7 (that is, in a place closer to the gusset plates 9 and 10 than the central portion 7e of the core material 7), the gusset plate 9 , 10 can be reduced, and the bending moment applied to the columns 4 and 4 and the beams 5 and 5 constituting the frame 1 can also be reduced.

Further, since the central portion 7e of the core material 7 indicated by dots (black dots) in FIG. 3 is integrated so as to be evenly pressed by the stiffening member 8 from both the front surface 7a and the back surface 7b, FIG. As shown by the solid line “when there is a buckling constraint” in FIG. 4, local buckling can be suppressed, stable hysteresis characteristics of the damper can be exhibited, and as shown in FIG. In addition, the shaft rigidity can be greatly increased as compared with a conventional damper having a plastic part only in the basic specifications and the central part.
FIG. 5 (a) shows an example of the test results obtained by the inventors. When a damper having an axial force of 150 tons and an axial rigidity of 420 ton / cm is used as a basic specification, for example, only a plastic portion is provided at the center portion. In the conventional damper having the above, the shaft rigidity can be increased up to 486 ton / cm, whereas in the damper according to the present invention, it can be increased up to 966 ton / cm.
In addition, this axial rigidity changes the (cross-section) shape of the stiffening member 8 arranged around the core material 7 as shown in FIGS. By changing the material, it can be easily adjusted to a desired strength (value) as appropriate.

  Furthermore, if the width dimension of the plastic parts 7f and 7g is reduced (that is, the notch part is enlarged), the yield stress can be further reduced as shown in FIG. That is, by adjusting the width dimensions of the plastic portions 7f and 7g, the yield stress value at which the plastic portions 7f and 7g cause plastic deformation can be appropriately adjusted to a desired value. FIG. 5 (b) shows an example of the test results obtained by the inventors through testing. As a value of the axial rigidity when the axial force is reduced to 30 tons, for example, a conventional structure having a plastic part only in the central part is shown. The damper of the present invention can be 608 ton / cm, whereas the damper of the present invention can be 375 ton / cm.

In addition, this invention is not limited to the thing of embodiment mentioned above. That is, in the above-described embodiment, the core member 7 has been described as a plate-like member having a rectangular shape in plan view, but may be a rod-like member having a circular shape in sectional view.
Further, as shown in FIG. 3B, the core material 7 and the stiffening members 8 and 8 are integrated into a plurality (for example, 8) provided in both the core material 7 and the stiffening members 8 and 8, respectively. May be made by a high-strength bolt or the like (not shown) that is passed through the through-holes h, or as shown in FIG. 3C, a plurality (for example, four) provided in the stiffening members 8, 8 ) May be made by welding the inside of the opening o.
Further, an unbonded material (elastic member) made of rubber, for example, having a thickness of about 1 mm is formed between the plastic portions 7f and 7g (and the end portions 7c and 7d) of the core member 7 and the thin portions 8b of the stiffening members 8 and 8, respectively. ) Is more preferable. As a result, it is possible to prevent frictional heat and noise that may be generated when the deformed plastic portions 7f and 7g (and the end portions 7c and 7d) and the inner surface of the thin portion 8b rub against each other.

It is a schematic whole perspective view which shows one Embodiment of the hysteresis damper by this invention, (a) is a figure which shows the state before plastic deformation, (b) is a figure which shows the state after plastic deformation. It is principal part sectional drawing of the hysteresis damper shown in FIG. 1, (a) is II sectional view taken on the line of FIG. 1 (a), (b) is II-II arrow sectional drawing of FIG.1 (b). is there. It is a conceptual diagram which shows the state which attached the hysteresis damper to the frame by this invention, Comprising: (a) is a figure which shows the state which attached the hysteresis damper shown in FIG. 1 and FIG. 2 to a frame, (b) is other embodiment. The figure which shows the state which attached the log | history damper by 1 to a frame, (c) is a figure which shows the state which attached the log | history damper by another embodiment to a frame. It is a graph which shows the log | history characteristic which the log | history damper by this invention has. FIG. 5 is a diagram for enlarging the main part of the first quadrant of the chart shown in FIG. 4 and for comparing and explaining the damper according to the present invention, a conventional damper having a plastic part only at the center part, and basic specifications. (A) is a table | surface when adjusting only a shaft rigidity, (b) is a figure at the time of adjusting as a damper of a low yield axial force high shaft rigidity. It is a figure similar to FIG. 2, Comprising: (a)-(h) is a figure which shows the various forms of a stiffening member, respectively. FIG. 3 is a front view showing a state in which the history damper shown in FIGS. 1 and 2 is installed in a frame.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Frame 2 Structure 3 History damper 7 Core material 7c End part (one end part)
7d end (other end)
7e Central part 7f Plastic part 7g Plastic part 8 Stiffening member 9 Gusset plate (part of frame)
10 Gusset plate (other parts of the frame)

Claims (2)

It is a history damper that is installed as a brace in the construction frame of the building and also functions as a damper that absorbs vibration energy of the building,
A single core member formed of a material having a lower yield stress compared to the frame, one end of which is bonded to a part of the frame and the other end of which is bonded to another part of the frame ; ,
A pair of stiffening members arranged so as to sandwich the core material ,
A plastic part is provided between one end part and the central part of the core material, and between the other end part and the central part of the core material ,
The hysteresis damper , wherein the stiffening member has a thick portion that is in close contact with the central portion and a thin portion that forms a gap between the plastic portion . The hysteresis damper according to claim 1 , wherein rubber is provided between the plastic portion and the stiffening member.

Images