JP5216050B2 - Hysteretic damper structure - Google Patents

Description

  The present invention relates to a structure including a hysteretic damper used as a diagonal material in a building structure.

  Diagonal members (braces) inserted diagonally between pillars and beams of a structure generally support the tensile force or compressive force that accompanies deformation between the columns and beams, and the proof stress is against the tensile force. Is determined by the yield strength (Ny) and the buckling strength (Ncr) smaller than the yield strength for the compressive force, and the yield strength decreases after buckling. However, a brace with a structure that retains the same strength as tension against compression by restraining buckling has been developed, and an alternating axial force (repetitive displacement) of tension and compression acts like a seismic load. It is used as a history type damper. The basic configuration of the damper includes a core material (or axial force material) that causes plastic deformation, and a stiffening member that loosely fits and circumscribes the core material with a predetermined gap. This stiffening member restrains the buckling of the core material.

Conventionally, as this stiffening body, there are known a combination of concrete and a steel pipe (for example, Patent Document 1 and Patent Document 2) and a structure made of only a steel material that is typically a steel pipe (for example, Patent Document 3). .
Among them, Patent Document 3 by the present applicant is a long structure that receives an alternating axial force of tension and compression, and a hysteretic damper portion in which both ends of the intermediate portion are connected to other members, respectively. A structure is provided that provides. As the hysteretic damper part, one end is joined to the intermediate part, the other end is joined to the building structure, and the stiffened steel pipe fixed to the intermediate part so as to loosely fit and circumscribe the core. What is provided is disclosed in Patent Document 3.

JP 2003-343116 A Japanese Patent No. 4263664 Japanese Patent No. 3997289

The structure by patent document 3 respond | corresponds to the alternating axial force acted repeatedly, when a core material expands / contracts inside a stiffened steel pipe according to tension and compression. However, when the present inventors examined the structure by applying various alternating axial forces, the behavior of the core material particularly at the open end of the stiffened steel pipe became unstable, and the design was planned. It may be difficult to exhibit the rigidity, proof stress, and repeated deformation performance, and vibration energy may not be sufficiently absorbed.
The present invention has been made based on such a technical problem, and provides a structure including a hysteretic damper capable of stably obtaining the behavior of the core material at the open end of the stiffened steel pipe. Objective.

The present inventors have confirmed the factors that cause the behavior to become unstable. As a result, the following two problems were found.
Problem 1: Deformation in the direction perpendicular to the axial direction of the core material (hereinafter referred to as lateral deformation) is restrained by a stiffening member surrounding the core material, so that it does not buckle. However, when the core material is stretched by receiving a tensile force, the portion of the core material located inside the stiffening member is exposed to the outside from the open end of the stiffening member. If this exposed part receives a strong compressive force, it will buckle locally, and deformation exceeding the gap with the stiffening member may occur. If it does so, a deformation | transformation part will interfere with the open end part of a stiffening steel pipe, and contraction of a core material will be prevented. As a result, the behavior of the core material becomes unstable.
Problem 2: When the lateral deformation becomes excessive and the core applies a load to the open end of the stiffened steel pipe, the stiffened steel pipe may not retain its original cross-sectional shape and may increase in diameter. As a result, the behavior of the core material becomes unstable, and it becomes difficult for the hysteretic damper to exhibit the desired rigidity and proof strength, and the core material is likely to buckle at the portion where the diameter is increased.

Corresponding to Problem 1, the present invention proposes to prevent buckling from occurring in the portion exposed to the outside from the open end of the stiffening member, such as stiffening exchange, as the alternating load is loaded.
That is, the hysteresis damper structure of the present invention includes a pair of hysteresis damper portions disposed at both ends in the longitudinal direction and an intermediate portion connecting the pair of hysteresis damper portions. Each hysteretic damper portion is opposed to an alternating axial force composed of a tensile force and a compressive force acting in the axial direction, a core member having one end connected to an intermediate portion, and a core member provided around the core member. A first stiffening member that restrains buckling.
According to the present invention, the core material of each hysteretic damper portion is a second stiffening member in a first region exposed to the outside from the open end portion of the first stiffening member as the alternating axial force is loaded. It is characterized by providing.
Further, the hysteresis damper structure of the present invention is a core material having a cross-shaped cross section in which four projecting plates are orthogonal. In this case, the second stiffening member is provided with ribs between the protruding plates adjacent in the direction around the axis of the core member. The form of the rib is as shown in the embodiments described later.

  According to the present invention, by providing the second stiffening member in the first region exposed to the outside from the open end of the first stiffening member, it is possible to prevent local buckling from occurring in the region. it can. Therefore, the hysteretic damper structure of the present invention has a stable behavior of the core material and exhibits the rigidity, proof stress, and repetitive deformation performance planned in the design, and can sufficiently absorb vibration energy.

  In the hysteretic damper structure of the present invention, the second stiffening member is preferably provided from the open end to the second region exposed to the outside in a steady state in addition to the first region. By doing so, the behavior of the core material can be further stabilized.

Corresponding to Problem 2, the present invention proposes to provide a third stiffening member that stiffens the open end of the first stiffening member in a direction perpendicular to the axial direction of the core member.
By providing the third stiffening member, when the lateral deformation of the core material is likely to be excessive, the first stiffening member can maintain the cross-sectional shape against the lateral force.
In addition, since the expected stiffening effect can be obtained by doing so, the binding force in the vicinity of the open end of the first stiffening member is exerted as designed, and the core material is buckled by the compressive force. Can be prevented.
Moreover, although the 3rd stiffening member is provided with the penetration path which a core material penetrates, it is preferable to make the shape of this penetration path into the external shape similar shape of a cross section with a core material. By doing so, the gap between the third stiffening member and the core material can be managed by specifying the dimensions of the through-passage, making it easy to ensure manufacturing accuracy and manufacturing a hysteretic damper structure at low cost. This is advantageous.

  When the third stiffening member is provided, the gap S2 between the third stiffening member and the core material is set to be smaller than the gap S1 between the first stiffening member and the core material. It is preferable. When the gap S2 is larger than the gap S1, the lateral force acting on the open end of the first stiffening member is increased, but the lateral force is suppressed to be small by making the gap S2 smaller than the gap S1. It becomes possible.

According to the present invention in which the second stiffening member is provided in the region exposed to the outside from the open end portion of the first stiffening member, local buckling can be prevented from occurring in the region exposed to the outside. .
Further, by providing the third stiffening member, the cross-sectional shape of the first stiffening member can be maintained even when the lateral deformation of the core material is likely to be excessive.
Therefore, the hysteretic damper structure of the present invention can stably absorb vibration energy because the behavior of the core material is stable and the rigidity, proof stress, and repeated deformation performance planned in the design can be exhibited.

It is a figure which shows the whole structure of the structure provided with the hysteresis type damper of 1st Embodiment. The structure of the hysteresis type damper of 1st Embodiment is shown, (a) is a fragmentary longitudinal cross-sectional view, (b) is a 2b-2b arrow sectional view of (a), (c) is 2c-2c arrow of (a) FIG. The structure of the hysteresis type damper of 2nd Embodiment is shown, (a) is a fragmentary longitudinal cross-sectional view, (b) is 3b-3b arrow sectional drawing of (a), (c) is 3c-3c arrow of (a). (D) is a 3d-3d arrow sectional view of (a). In 2nd Embodiment, it is sectional drawing which shows the example of the arrangement position of a stiffening end plate. The other example of the 2nd stiffening member by this invention is shown, (a) is a figure corresponding to 3b-3b arrow sectional drawing of FIG. 3, (b) is 3c-3c arrow sectional drawing of FIG. It is a corresponding figure. The other example of the 2nd stiffening member by this invention is shown, (a) is a figure corresponding to 3b-3b arrow sectional drawing of FIG. 3, (b) is 3c-3c arrow sectional drawing of FIG. It is a corresponding figure. The structure of the hysteresis type damper of a reference example is shown, (a) is a partial longitudinal sectional view, (b) is a sectional view taken along arrow 7b-7b in (a), and (c) is a sectional view taken along arrow 7c-7c in (a). FIG. 4D is a cross-sectional view taken along the line 7d-7d in FIG. It is a figure explaining the factor by which the behavior of a core material becomes unstable in the conventional hysteresis type damper structure, (a) is a mimetic diagram showing a normal hysteresis type damper structure, (b) is the inside of a stiffening steel pipe (C) is a schematic diagram showing a state where local buckling has occurred in the portion of the core material that was located in the outside exposed from the open end portion, (c) is an excessive lateral deformation, the stiffened steel pipe is the original It is a schematic diagram which shows the state which became impossible to hold | maintain a cross-sectional shape.

Hereinafter, the present invention will be described in detail based on embodiments shown in the accompanying drawings.
<First Embodiment>
As shown in FIG. 1, the hysteretic damper structure 10 of the first embodiment is used as a diagonal member (brace) of a steel structure 1 composed of columns 2 and beams 3 and acts in the axial direction in the event of an earthquake. The steel structure 1 is configured to maintain an elastic state by plasticizing only the hysteretic damper structure 10 (core material 12) when receiving an alternating axial force composed of a tensile force and a compressive force. . Therefore, since the plastic deformation part of the steel structure 1 is specified as the hysteresis damper structure 10, the hysteresis damper structure 10 can be prevented from being broken or the steel structure 1 can be collapsed. Moreover, since the steel structure 1 except the hysteresis type damper structure 10 always maintains an elastic state, after the earthquake, it is restored to its original shape and position, and only the plasticized hysteresis type damper structure 10 is replaced. The steel structure 1 can be used continuously.
As shown in FIGS. 1 and 2, the hysteresis damper structure 10 includes a pair of hysteresis damper portions 11 disposed at both ends in the longitudinal direction, and an intermediate portion 20 that connects the pair of hysteresis damper portions 11 to each other. I have. Each of the pair of hysteretic damper portions 11 includes a core member 12 and a stiffening steel pipe (first stiffening member) 18.
The hysteretic damper structure 10 is fixed to the joint members 4 and 4 respectively attached to the diagonal joints between the columns 2 and the beams 3 by joints 13 by bolt joints 15.

<Core material 12>
The core material 12 has a cross-shaped cross section by combining steel plates having a uniform thickness. One end of the core material 12 is connected to the intermediate portion 20, and a joint portion 13 is provided at the other end. The core material 12 is integrally formed in the axial direction including the joint portion 13 from the connection end with the intermediate portion 20. The hysteretic damper portion 11 absorbs energy by plastic deformation of the region from the connection end to the intermediate portion 20 to the joint portion 13 when a tensile force or a compressive force of a predetermined magnitude or larger is applied. The core material 12 and the intermediate portion 20 may be connected by a known method such as using an interrupt gusset described in Patent Document 3. The joint portion 13 is provided with a bolt hole 14 for joining with the joining member 4 and the bolt joint 15.

  The core member 12 is provided with a stiffening plate 16 on the side where the joint portion 13 is provided. The steel stiffening plate (second stiffening member) 16 includes a protruding plate 12a and a protruding plate 12b (FIG. 2) in which a pair of opposing sides are adjacent to each other in the direction around the axis of the cross-shaped core member 12. By being fixed to (c)), the stiffening plate 16 increases the rigidity between the protruding plate 12a and the protruding plate 12b. The same applies to the protruding plate 12b and the protruding plate 12c, the protruding plate 12c and the protruding plate 12d, and the protruding plate 12d and the protruding plate 12a, so that the core 12 has improved rigidity in the region where the stiffening plate 16 is provided. Has been. The stiffening plate 16 may be fixed to the protruding plates 12a to 12d by a known method such as welding.

<Stiffened steel pipe 18>
The stiffened steel pipe 18 having a rectangular cross section disposed around the core material 12 restrains the core material 12 from buckling when it receives an alternating axial force. The core member 12 is disposed inside the stiffened steel pipe 18 so that the tops of the projecting plates 12 a to 12 d correspond to the respective corners of the stiffened steel pipe 18. A gap S1 is provided between each apex and each corner (FIG. 2 (b)), and the core material 12 is restrained from buckling by preventing deformation beyond the gap S1. The By doing so, the core material 12 exhibits the same elasto-plastic behavior when it receives a tensile force when it receives a compression axial force.
One end of the stiffened steel pipe 18 is connected to the intermediate portion 20, and the other end is provided with an open end portion 19 through which the core material 12 passes. The core member 12 penetrates through the open end 19 so that expansion and contraction upon receiving an alternating axial force is allowed.

<Intermediate part 20>
The intermediate part 20 is comprised from a round steel pipe, for example. The intermediate part 20 is located between a pair of hysteresis type damper parts 11 and 11, and connects both. The intermediate portion 20 is configured to be more rigid than the core member 12, and transmits the axial force to the pair of hysteretic damper portions 11, 11 when an alternating axial force is applied.
By providing the intermediate portion 20, it becomes easier to manage the production accuracy of the hysteretic damper portion 11 than the structure in which the hysteretic damper structure of the type in the present invention occupies the entire length, and the length of the hysteretic damper structure 10 is increased. It is possible to scale, and the yield axial force can be adjusted individually with the hysteretic damper part 11 and the axial rigidity with the intermediate part 20, so it is optimal for the hysteretic damper structure 10. It is possible to set various member characteristics.

<Basic action of hysteretic damper structure>
For example, when an earthquake load is applied, the hysteretic damper structure 10 receives an alternating axial force of tension and compression, and this axial force is the core of the hysteretic damper section 11 via the joint portions 13 at both ends of the hysteretic damper structure 10. It is transmitted to the intermediate portion 20 through the material 12. When the tensile axial force reaches the yield axial force (+ Ny) of the core material 12, plastic axial deformation (+ δ) occurs, and when the compression axial force reaches the yield axial force (−Ny) of the core material 12, plastic deformation (− δ) occurs. At this time, the core 12 that has received the compression axial force tends to buckle and deform, but the deformation is restrained by the stiffened steel pipe 18 provided around the gap S to prevent buckling. Thus, the entire hysteretic damper structure 10 responds by drawing a hysteretic curve. As a result, the seismic energy is absorbed and the vibration is attenuated.

<Characteristic Action of First Embodiment>
In the course of the above history, the core material 12 does not buckle to the extent that it collapses in the region accommodated in the stiffened steel pipe 18. However, in a steady state where the alternating axial force does not act, even if it is accommodated inside the stiffened steel pipe 18, the region that passes through the open end 19 and is exposed to the outside of the stiffened steel pipe 18 (the first) 1 region). When the compression axial force is received in this state, as shown in FIG. 8 (b), the core material 12 undergoes local buckling deformation B in the region exposed to the outside of the stiffened steel pipe 18, and the stiffened steel pipe. 18 may be deformed beyond the gap S1. If it does so, buckling deformation B will interfere with the open end part 19 of the stiffening steel pipe 18, and contraction of the core material 12 will be prevented. FIG. 8A shows a normal state before local buckling B occurs.
On the other hand, the hysteretic damper structure 10 is provided with a stiffening plate 16 on the core member 12 to prevent local buckling. That is, the hysteretic damper structure 10 is provided with the stiffening plate 16 in the region exposed to the outside of the stiffening steel pipe 18 through the open end 19 due to the action of a tensile force, and therefore receives the compressive axial force. However, local buckling is prevented from occurring in the region. Therefore, the hysteretic damper structure 10 can stably absorb vibration energy because the behavior of the core material 12 is stable and exhibits the rigidity, proof stress, and repetitive deformation performance planned in the design.

  The hysteretic damper structure 10 is provided to extend to a region (second region) where a part of the stiffening plate 16 is exposed from the stiffening steel pipe 18 even in a steady state. This is because if the area (second area) buckles in the state where the alternating axial force is applied and the core material is plasticized, there is a risk that the designed rigidity, proof stress and repeated deformation performance may be impaired. In order to prevent this, the stiffening plate 16 is provided over the region exposed from the stiffening steel pipe 18 even in a steady state. It should be noted that the steady state referred to in the present invention refers to a state where there is no occurrence of an earthquake including the magnitude. In addition, a specific region in which the stiffening plate 16 is provided is appropriately determined according to the specifications of the hysteresis damper structure 10. The specification of the stiffening plate 16 is the same.

Second Embodiment
Next, a hysteretic damper structure 50 according to a second embodiment of the present invention will be described with reference to FIG. About the same individuality element as the hysteresis type damper structure 10 by 1st Embodiment, the code | symbol same as FIG. 1, FIG. 2 is attached | subjected to FIG. 3, and the description is abbreviate | omitted.

In the hysteretic damper structure 50, a stiffening end plate (third stiffening member) 21 is fixed to the open end portion 19 of the stiffening steel pipe 18.
The stiffening end plate 21 has a rectangular outer periphery shape and is similar to the outer shape of the stiffening steel pipe 18, and the surface facing the open end 19 is joined to the periphery of the open end 19 by welding, for example. Has been. Therefore, the stiffening end plate 21 improves the rigidity of the stiffening steel pipe 18 in the vicinity of the open end 19.
The stiffening end plate 21 has a passage 24 penetrating the front and back. The core material 12 and the stiffening plate 16 of the hysteretic damper 11 pass through the substantially rectangular passage 24 in a state where the stiffening end plate 21 is fixed to the open end 19.

Here, since the lateral deformation becomes excessive and the core 12 applies a load to the open end 19 of the stiffened steel pipe 18, the stiffened steel pipe 18 maintains its original cross-sectional shape as shown in FIG. 8C. In particular, the open end 19
The diameter may increase. However, in the hysteretic damper structure 50, since the stiffening end plate 21 improves the rigidity of the stiffening steel pipe 18 in the vicinity of the open end 19, the core 12 applies a load to the open end 19 of the stiffening steel pipe 18. However, the stiffened steel pipe 18 can maintain its cross-sectional shape. Therefore, according to the hysteretic damper structure 50, the behavior of the core material 12 is more stable, and the rigidity and proof stress planned in the design can be exhibited.

In order to effectively obtain the action of the stiffening end plate 21, the thickness of the stiffening end plate 21 is desirably set based on the following formula (1).
σ = Re / At ≦ σa (1)
However, σ, Re, At, and σa are defined as follows.
σ: Stress level (compression) generated in the stiffening end plate 21, Re: Lateral force acting on the stiffening end plate 21 At: Cross-sectional area of the stiffening end plate 21 receiving the lateral force (surface width Bt (stiffening end) (Represented by the length of one side of the plate 21 (rectangular section)), plate thickness tt: parameter)
σa: Allowable stress level

For example, for a damper structure with Re = 100 kN, if Bt = 230 mm and the plate thickness tt = 10 mm, then 100000 N / (230 mm × 10 mm) = 43 N / mm ² . If the stiffening end plate 21 is made of JIS SS400 (σa = 235 N / mm ² ), it is designed with a sufficient margin in strength.

Next, the preferable form in the case of providing the stiffening end plate 21 will be described.
A stiffened steel pipe is formed with a gap S2 between the inner peripheral edge of the stiffened end plate 21 installed at the open end 19 of the stiffened steel pipe 18 of the hysteretic dampers 11 on both sides and the tops of the protruding plates 12a to 12d of the core member 12. It is preferable to make it smaller than the clearance S1 between each corner portion of 18 and the top portions of the protruding plates 12a to 12d of the core member 12.
When the gap S2 is made larger than the gap S1, the amount of movement of the core material 12 receiving the lateral force toward the stiffening end plate 21 increases, and the core material 12 is deformed at a large angle. When the core member 12 is deformed and collides with the inner edge of the stiffening end plate 21, the lateral force acting on the stiffening end plate 21 from the core member 12 becomes larger when the deformation angle is larger. Therefore, in order to suppress the angle due to the deformation of the core material 12, the gap S <b> 2 is made smaller than the gap S <b> 1, and the lateral force generated when the core material 12 collides with the stiffening end plate 21 can be reduced.
In addition, it is preferable that the peripheral edge defining the passage 24 of the stiffening end plate 21 and the outer surface of the core member 12 penetrating the passage 24 have a similar shape, and the gap is almost the same at any position. By doing so, it is possible to manage the gap amount between the stiffening end plate 21 and the core material 12 by specifying the dimension of the passage 24, so that it is easy to ensure manufacturing accuracy, and the hysteretic damper structure is inexpensive. This is advantageous in manufacturing.
Further, although the stiffening end plate 21 can be made of concrete, it is preferable to make the stiffening end plate 21 of steel having a strength about 10 times higher than that of concrete in order to obtain a stiffening effect. In addition to the advantage of strength that the stiffening end plate 21 is made of steel, the shape of the passage 24 can be easily managed and the manufacturing accuracy is high.

<Mounting position of stiffening end plate>
In the above, the stiffening end plate 21 is provided at the open end 19 of the stiffening steel pipe 18. However, the attachment position is not limited as long as the stiffened steel pipe 18 can maintain the cross-sectional shape. For example, a stiffening end plate 22 can be provided inside the stiffening steel pipe 18 as shown in FIG. 4A, and a stiffening end plate 21 is provided at the open end 19 as shown in FIG. In addition to the provision, the stiffening end plate 22 can also be provided inside the stiffening steel pipe 18.

<Modification of second stiffening member>
Although FIG. 1 and FIG. 2 show the stiffening plate 16 as the second stiffening member according to the present invention, the present invention is not limited to this.
For example, as shown in FIG. 5, a stiffening triangular prism 25 having a right-angled triangular cross section can be used as the second stiffening member according to the present invention. The stiffening triangular prism 25 is disposed so that two oblique sides sandwiching the right angle R are opposed to the adjacent projecting plates 12a and 12b (same as 12b and 12c, 12c and 12d, and 12d and 12a). Of course, the stiffening triangular prism 25 is joined to the core member 12 by appropriate means such as welding.
If this stiffening triangular prism 25 is made of the same steel, it has a higher rigidity than the stiffening plate 16, so that the buckling prevention effect of the core 12 is great.
Moreover, as shown in FIG. 6, the stiffening board 26 affixed on the front and back of each protrusion board 12a-12d of the core material 12 can be used as a 2nd stiffening member by this invention.
Since this stiffening plate 26 can be fixed by means such as welding in a state parallel to the front and back surfaces of the protruding plates 12a to 12d, compared to the stiffening plate 16 that needs to be fixed in an inclined state. The work of fixing to the core member 12 is easy and the same effect as the stiffening plate 16 can be obtained.

<Reference example>
Next, a hysteresis damper structure 110 according to a reference example will be described with reference to FIG.
As shown in FIG. 7, the hysteretic damper structure 110 includes a pair of hysteretic damper portions 111 disposed at both ends in the longitudinal direction, and an intermediate portion 120 that connects the pair of hysteretic damper portions 111 to each other. . Each of the pair of hysteretic dampers 111 includes a core material 112 and a stiffening steel pipe (first stiffening member) 118. FIG. 7 shows only the hysteresis damper 111 on one side.
The hysteretic damper structure 110 is fixed to the joining members 4 and 4 respectively attached to the diagonal joints between the columns 2 and the beams 3 shown in FIG.

<Core material 112>
The core material 112 is made of a steel material having a rectangular cross section. The hysteretic damper structure 110 uses four core members 112. Each core member 112 has one end connected to the intermediate portion 120 and the other end connected to the joint portion 113. The four core members 112 are arranged in a cross lattice shape through a cross-shaped spacer 117, and have a rectangular cross section as a whole. Since the spacer 117 and each core material 112 are arranged without being joined, each core material 112 is allowed to expand and contract in the axial direction regardless of the presence of the spacer 117.
The hysteretic damper portion 111 absorbs energy by plastic deformation of each core material 112. The connection between the core material 112 and the intermediate portion 120 and the connection between the core material 112 and the joint portion 113 may be performed by a known method such as using an interrupt gusset described in Patent Document 3. The joint portion 113 is provided with a bolt hole 114 for allowing the bolt joint 15 to pass therethrough.

  The core material 112 is provided with a cross stiffening plate (second stiffening member) 116 on the side where the joint portion 113 is provided. In the steel stiffening plate 116, the opposed surfaces of the four core members 112 are joined to the protruding plates 116a to 116d, respectively. Therefore, the rigidity of each core material 112 is improved by the stiffening plate 116. The core material 112 and the stiffening plate 116 may be joined by a known method such as welding.

<Stiffened steel pipe 118>
The stiffened steel pipe 118 having a rectangular cross section disposed around the core material 112 restrains the core material 112 from buckling when subjected to an alternating axial force, as in the first embodiment. By doing so, the core material 112 exhibits the same elasto-plastic behavior when it receives a compressive axial force as when it receives a tensile axial force.
One end of the stiffened steel pipe 118 is connected to the intermediate portion 120, and the other end is provided with an open end portion 119 through which the core material 112 passes. The core material 112 penetrates through the open end portion 119, so that expansion and contraction upon receiving an alternating axial force is allowed.

<Intermediate portion 120, stiffening end plate 121>
The intermediate part 120 has the same configuration and function as the intermediate part 20 of the first embodiment.
Further, in the hysteretic damper structure 110, similarly to the hysteretic damper structure 50 of the second embodiment, a stiffening end plate (third stiffening member) 121 is joined to the open end 119 of the stiffening steel pipe 118. Has been. The configuration and operation of the stiffening end plate 121 are the same as those of the stiffening end plate 21 of the hysteretic damper structure 50 of the second embodiment.

History damper structure 110, like the first embodiment, the stiffener plate 116 is provided in a region exposed through the open end 119 by the action of the pulling force to the outside of the stiffening steel pipe 118 Therefore, even if it receives a compressive force, it is prevented that local buckling arises in the said area | region. Therefore, the hysteretic damper structure 110 has a stable behavior of the core material 112 and exhibits the rigidity, proof stress, and repetitive deformation performance planned in the design, and therefore can effectively absorb vibration energy.
Further, according to the history damper structure 110, it is possible to design a large yield load compared to the core material having a cross-shaped cross-section.

  As mentioned above, although embodiment by this invention was described, the fundamental structure of a hysteresis type damper structure can be changed suitably. For example, the embodiment described above is obtained by joining the core member 12 and the intermediate portion 20 that are produced separately, but the joint member 13 and the core member 12 to the intermediate portion 20 are integrated in the axial direction. It can also be produced. Moreover, although the tubular thing was shown as a 1st stiffening member by this invention, if it restrains the buckling of a core material, it will not be limited to this.

DESCRIPTION OF SYMBOLS 1 ... Steel-frame structure, 2 ... Column, 3 ... Beam, 4 ... Joining member 10, 50, 110 ... Hysteresis type damper structure 11, 111 ... Hysteresis type damper part 12, 112 ... Core material, 12a-12d ... Projection board 16, 26, 116 ... stiffening plate (second stiffening member)
18, 118 ... Stiffened steel pipe (first stiffening member), 19, 119 ... Open end 20, 120 ... Intermediate part 21, 22, 121 ... Stiffened end plate (third stiffening member)
25 ... Stiffening triangular prism (second stiffening member)
117 ... Spacer

Claims (4)

A pair of hysteretic dampers disposed at both ends in the longitudinal direction;
An intermediate portion connecting the pair of the hysteresis damper portions,
Each of the hysteretic damper parts is
A core material, one end of which is connected to the intermediate portion, facing an alternating axial force composed of a tensile force and a compressive force acting in the axial direction,
A first stiffening member provided around the core material to restrain buckling of the core material;
A second stiffening member provided in a first region exposed to the outside from the open end of the first stiffening member as the alternating axial force is loaded as a core material of each hysteretic damper portion and, with a,
The core material has a cross-shaped cross section in which four protruding plates are orthogonal,
The hysteretic damper structure according to claim 2, wherein the second stiffening member is a rib provided between projecting plates adjacent to each other in a direction around the axis of the core member . The second stiffening member is
In addition to the first region, provided in a steady state from the open end portion to the second region exposed to the outside,
The hysteretic damper structure according to claim 1. A third stiffening member that stiffens in the direction perpendicular to the axial direction is provided at the open end of the first stiffening member;
The hysteresis type damper structure according to claim 1 or 2 . The gap S2 between the third stiffening member and the core material is set to be smaller than the gap S1 between the first stiffening member and the core material.
The hysteretic damper structure according to claim 3 .

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