JP5958757B2 - Brace damper - Google Patents

Description

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

As this type of brace damper, those shown in Patent Documents 1 to 3 are well known and widely used.
These brace dampers have a core material (brace body) made of a strip-shaped steel plate whose ends are joined to the building, and seats in the out-of-plane direction and the in-plane direction while allowing axial deformation of the core material. It is characterized by comprising a buckling restraining member that prevents bending.
And said buckling restraint member is fastened with respect to the pair of channel steel which is arrange | positioned in the back-to-back state on both sides of a core material, and clamps a core material from both sides, and the flange part of these channel steels, and both It is mainly composed of a cover plate made of a steel strip that connects channel steels.

Japanese Patent No. 3941028 Japanese Patent No. 3637534 Japanese Patent No. 3820520

By the way, in the conventional brace damper, a rolled channel steel is generally used as a channel steel as a buckling restraining member. However, such a rolled channel steel has a maximum width dimension (section cross section) according to JIS standards. Dimension) is defined as 380 mm, and there is a restriction that a rolled channel steel having a larger cross section than that cannot be used.
Therefore, in the conventional brace damper using rolled channel steel as a buckling restraining member, the maximum width dimension of the core material inevitably must be less than 380 mm, and further using a core material with a larger cross section than that. High yield strength cannot be achieved.

In order to achieve further higher yield strength under the restriction that the width of rolled channel steel and core material must be less than 380 mm as described above, it is considered to increase the thickness of the core material. However, the allowable thickness dimension of the strip-shaped steel plate used as the core material is naturally limited. For example, in the case of SN400B material that is frequently used as a core material, the standard strength decreases when the thickness exceeds 40 mm, so the maximum thickness is limited to 40 mm and beyond It is difficult to achieve high yield strength.
Therefore, it is conceivable that a plurality of core materials having a thickness of less than 40 mm are laminated and used to make the total thickness of the core material 40 mm or more, but in this case, the individual core materials behave independently, so the whole It becomes easy to cause instability phenomena such as buckling and local buckling, and not only does this kind of brace damper not fully function, but also the design and assembly are greatly complicated. Therefore, it is not preferable.

Furthermore, as another method for achieving high yield strength, it is also conceivable to use a rolled steel having a large cross section instead of a rolled steel as a buckling restraining member, for example, in Japanese Patent No. 4196285. In the brace damper shown, an assembled channel steel having a large cross section constituted by fixing a plurality of members as a buckling restraining member is used.
However, in order to ensure the same characteristics as rolled channel steel with assembled channel steel, it requires complicated and troublesome work that requires high accuracy such as assembly work by welding and bending, Compared with the case of using rolled channel steel, the cost must be considerably increased, which is also not preferable.

  In view of the above circumstances, the present invention is based on the premise that a rolled channel steel is used as a buckling constraining member in the same manner as a conventional brace damper, and thus it is possible to achieve high strength while maintaining a simple configuration and low cost. An object of the present invention is to provide an effective and appropriate brace damper that can be achieved without any trouble.

  The present invention is a brace damper that functions as a damper that is installed as a brace in a building and absorbs vibration energy of the building, and a core material made of a strip-shaped steel plate whose both ends are joined to the building; A buckling restraining member that is mounted around the core material and prevents buckling in the out-of-plane direction and in-plane direction while allowing axial deformation of the core material; A pair of rolled channel steels arranged back to back on both sides and sandwiching the core material from both sides, and a strip steel fastened to a flange portion of the rolled channel steels to connect the two rolled channel steels The width of the core material is larger than the width of the web portion of the rolled channel steel, and both side edges of the core material are the rolled channel steel. On the outside of the flange The projecting portion is a protruding portion, spacers are arranged on both sides of the projecting portion, and the spacer is sandwiched between the cover plate and the flange portion of the rolled channel steel. .

According to the brace damper of the present invention, it is possible to make the width dimension of the core material larger than the width dimension of the rolled channel steel by an amount corresponding to the thickness of the spacer, and therefore, limited to the maximum dimension of the rolled channel steel. Therefore, it is possible to set the width dimension of the core material freely and optimally, so that high yield strength can be realized without hindrance.
Of course, the brace damper according to the present invention does not increase the cost, because it is only necessary to add a spacer to the buckling restraining member in this type of conventional brace damper. There is no need for trouble and trouble, and since the effect of out-of-plane stiffening by the spacer is exhibited, an increase in cross-sectional rigidity can be expected.

The brace damper which is embodiment of this invention is shown, (a) is a side view, (b) is a cross-sectional view (b-b line view in (a)), (c) is a cross-sectional view (( (a) cc line view), (d) is a cross-sectional view (dd line view in (a)).

1A to 1D show a schematic configuration of a brace damper according to an embodiment of the present invention.
The brace damper according to the present embodiment functions as a damper that is installed as a brace in a building and absorbs vibration energy of the building, like conventional brace dampers as disclosed in Patent Documents 1 to 3. The core material 1 made of a strip-shaped steel plate whose both ends are joined to the building, and mounted in the periphery of the core material 1 while allowing the axial deformation of the core material 1 in the out-of-plane direction and the in-plane direction It is basically composed of a buckling restraining member 5 for preventing buckling.

Both ends of the core material 1 are fixed portions 1a fixed to the building, and as shown in FIGS. 1 (c) and 1 (d), flange plates 2 are welded to the top and bottom, and the building A large number of bolt holes 3 are formed for connection to each other by bolt fastening.
As shown in FIG. 1 (b), the central portion between the fixed portions 1a at both ends of the core material 1 corresponds to the height dimension since it is shown as a vertical dimension in FIG. ) Is a slightly reduced yielding portion 1b, and when the core member 1 receives an axial force during an earthquake, the yielding portion 1b yields in the axial direction and exhibits a seismic control effect.

  As shown in FIG. 1 (b), the buckling restraining member 5 is arranged in a back-to-back state on both sides of the core material 1, and a pair of rolled channel steel 6 sandwiching the core material 1 from both sides, and a rolled channel shape. The cover plate 7 is mainly composed of a band plate that is fastened to the flange portion 6a of the steel 6 and connects the two rolled channel steels 6 to each other.

One end side of the rolled channel steel 6 (left end side in FIG. 1 (a)) is bolted and fixed to the fixing portion 1a of the core material 1 and their axial relative displacement is restricted, The other end side (same as the right end side) of the rolled channel steel 6 has an elongated bolt hole and is connected so as to be axially displaceable within the range of the elongated hole. The relative displacement in the axial direction of the yielding portion 1b of the core material 1 with respect to is allowed without being restricted.
Although the rolled channel steel 6 sandwiches the core material 1 from both sides, it is necessary to allow the axial relative displacement of the core material 1, so the web portion 6 b of the rolled channel steel 6 is placed on the surface of the core material 1. On the other hand, it is preferable to secure a slight clearance between them without being in close contact with each other, and to interpose an appropriate sliding sheet material between them in a slippable state as necessary.

As shown in FIG. 1B, the cover plate 7 has a width dimension capable of connecting the left and right flange portions 6a of a pair of rolled channel steel 6 back to back with the core material 1 interposed therebetween. The both side edge portions of the upper and lower cover plates 7 are fastened to the upper and lower flange portions 6a of the rolled channel steel 6 on both the left and right sides by a large number of bolts.
Therefore, the buckling restraining member 5 in the brace damper according to the present embodiment is assembled so that the pair of left and right rolled grooved steel 6 and the pair of upper and lower cover plates 7 form a substantially H shape as a whole around the core material 1. Thus, the core material 1 is sandwiched between the core material 1 in a state allowing axial deformation, thereby preventing the buckling of the core material 1 in the out-of-plane direction and the in-plane direction with reliability and being effective as a damper. It has become something that can function.

In the buckling restraining member 5 in the illustrated example, vertical ribs 8 and horizontal ribs 9 are provided as stiffeners for the rolled channel steel 6, which depend on the strength of the core material 1 and the damper length. If necessary, it may be provided, and can be omitted when the desired rolling restraint force can be secured by the rolled channel steel 6 itself.
Further, the thickness of the cover plate 7 and the bolt pitch and other specifications for fastening the cover plate 7 and the flange portion 6a of the rolled channel steel 6 may be appropriately adjusted according to the damper proof stress or the like.

  The above configuration substantially follows the basic configuration of the buckling restraining member in the brace damper shown in Patent Documents 1 to 3, but in this embodiment, a conventional general-purpose rolled channel steel 6 is used as it is. However, the following configuration is added in order to achieve high yield strength without hindrance.

  That is, in the brace damper of the present embodiment, as shown in FIGS. 1B and 1C, the width dimension of the core material 1 (corresponding to the height dimension because it is shown as a vertical orientation in the figure) is rolled. The width dimension of the web portion 6b of the channel steel 6 is the same as that of the web portion 6b, and both side edge portions (corresponding to the upper edge portion and the lower edge portion in the figure) of the yielding portion 1b of the core material 1 are respectively rolled grooves. It is set as the protrusion part 1c which protrudes on the outer side (upper side and lower side) of the flange part 6a in the shape steel 6. FIG.

As shown in FIG. 1 (b), spacers 10 are arranged on both sides of the projecting portions 1c, and the spacers 10 are sandwiched between the cover plate 7 and the flange portion 6a of the rolled channel steel 6. Has been.
In other words, the buckling restraining member in the conventional brace damper is such that the flange portion 6a of the rolled channel steel 6 and the cover plate 7 are directly brought into close contact with each other and bolted to each other. A spacer 10 having a desired thickness is interposed between the flange portion 6a of the channel steel 6 and the cover plate 7, and the flange portion 6a and the cover plate 7 are bolted together with the spacer 10 sandwiched therebetween. It has become.

Based on the above configuration, in the brace damper of the present embodiment, the width dimension of the core material 1 can be set freely and optimally without being restricted by the maximum width dimension of the rolled channel steel 6. .
That is, as described above, conventionally, the flange portion 6a of the rolled channel steel 6 and the cover plate 7 are directly brought into close contact with each other and fastened with bolts. The thickness dimension) must be smaller than the width dimension of the rolled channel steel 6 (same as above). Moreover, since it is a limit that the width dimension of the rolled channel steel 6 is 380 mm at the maximum, the width dimension (same) of the yielding portion 1 b of the core material 1 must be less than 380 mm. The above increase in yield strength was difficult.
On the other hand, in this embodiment, the width dimension (same) of the yielding part 1b of the core material 1 can be made larger by the thickness equivalent to the spacer 10 than the width dimension (same) of the web part 6b of the rolled channel steel 6. As a result, high yield strength can be realized without hindrance.

For example, when the width dimension of the rolled channel steel 6 is 380 mm at the maximum and the thickness dimension of the spacer 10 is 28 mm, the width dimension of the yielding portion 1b of the core material 1 is 380 + 28 × 2 = 436 mm. If the thickness of the spacer 10 is further increased, the width of the yielding portion 1b can be further increased to further increase the yield strength.
If necessary, spacers 10 having various thicknesses are prepared in advance, and the spacers 10 having predetermined thicknesses can be laminated in various combinations so that the thickness of the entire spacer 10 can be easily adjusted to a desired dimension. It is possible to adjust with high accuracy.
Moreover, the spacer 10 does not necessarily need to be provided over the entire length, and may be provided intermittently (partially) as long as necessary performance can be ensured.

  As described above, according to the brace damper of the present invention, a high yield strength can be obtained simply by adding the spacer 10 to the buckling restraining member in the conventional general brace damper as shown in Patent Documents 1 to 3. Therefore, there is no increase in cost, and there is no need for troublesome and troublesome design and assembly. Of course, it is not necessary to increase the thickness of the core material excessively, or to process complicated assembled channel steel with troublesome labor.

  In addition, since the buckling restraining member 5 of the present invention also exhibits an out-of-plane stiffening effect by the spacer 10, it is possible to expect an increase in cross-sectional rigidity (particularly an increase in cross-sectional secondary moment in the weak axis direction).

DESCRIPTION OF SYMBOLS 1 Core material 1a Fixed part 1b Yield part 1c Protrusion part 2 Flange plate 3 Bolt hole 5 Buckling restraint member 6 Rolled channel steel 6a Flange part 6b Web part 7 Cover plate 8 Vertical rib 9 Horizontal rib 10 Spacer

Claims (1)

A brace damper that is installed as a brace in a building and functions as a damper that absorbs vibration energy of the building,
A core made of a strip-shaped steel plate whose ends are joined to the building;
A buckling restraining member that is mounted around the core material and prevents axial buckling in the out-of-plane direction and in-plane direction while allowing axial deformation of the core material,
The buckling restraining member is disposed on both sides of the core material in a back-to-back state and is fastened to a pair of rolled channel steels sandwiching the core material from both sides and a flange portion of the rolled channel steels. And the core plate is made mainly of a cover plate made of a steel strip for connecting the rolled channel steels, and the core is made larger in width than the webs of the rolled channel steels. Both side edges of the material are projecting portions projecting outside the flange portion of the rolled channel steel, and spacers are disposed on both sides of the projecting portion, respectively, and the spacers are the cover plate and the rolled channel shape. A brace damper which is sandwiched between the flange portion of steel.

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