JP2006283376A - Seismic-response controlled structure of lightweight steel-framed house - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a seismic-response controlled structure which can reduce the deformation of a building by efficiently converting vibrational energy, generated by earthquakes, into thermal energy. <P>SOLUTION: In an area R1 on the upside of a middle rail 4 of a framework frame 1, a first damper unit D1 with first-fourth viscoelastic dampers 5a-5d is mounted. In an area R2 on the downside of the middle rail 4, a second damper unit D2 with fifth-eighth viscoelastic dampers 5e-5h is mounted. Additionally, in the framework frame 1, the mounting rigidity of each mounting part of the first-eighth viscoelastic dampers 5a-5h, the storage rigidity of each of the first-eighth viscoelastic dampers 5a-5h, and the loss coefficient of each of the first-eighth viscoelastic dampers 5a-5h are adjusted to satisfy predetermined conditions, when a story deformation angle is 1/200 rad in horizontal deformation. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a vibration control structure employed in a lightweight steel house in order to attenuate vibrations generated by an earthquake.

  As a light-damping structure for lightweight steel houses, a frame consisting of pillars and horizontal members is attached between the upper and lower beams, and viscoelastic dampers and oil dampers are installed on the inside and outside of the frame. It is known that a seismic effect can be obtained by providing energy by absorbing earthquake energy as viscous damping energy. Specifically, a seismic control structure in which a viscoelastic damper is installed between the frame and the beam (Patent Document 1), or the frame is divided into upper and lower frames, and viscoelasticity is formed between these two frame frames. Damping structure with dampers (Patent Document 2), reinforcing material is installed horizontally so that the inside of the frame is divided into two parts vertically, and the two oil dampers are staggered at the top and bottom of the reinforcing material. An installed K-brace type damping structure (Patent Document 3) is known.

JP 2001-90381 A JP 2001-90379 A JP 2004-218207 A

  However, in the frame frame in the conventional vibration control structure, if the balance between the frame frame mounting rigidity excluding the viscoelastic damper (the entire frame frame mounting rigidity) and the viscoelastic damper storage rigidity (hardness) is poor, Before the viscoelastic damper is displaced, the frame itself and the attachment portion of the viscoelastic damper are deformed, and a situation in which sufficient damping performance cannot be obtained occurs.

  The object of the present invention is to eliminate the problems of the conventional light-damped steel housing vibration control structure, the viscoelastic damper exhibits sufficient damping characteristics, and efficiently converts vibration energy from the earthquake into thermal energy, The object of the present invention is to provide a damping structure for a light-weight steel house that can reduce the deformation of the building.

Among the present inventions, the structure of the invention described in claim 1 is a vibration control of a lightweight steel frame housing in which a viscoelastic damper is installed on a frame frame composed of left and right column members and upper and lower horizontal members. In the structure, the inside of the framework frame is divided into two upper and lower regions by an intermediate rail, and in the upper region of the intermediate rail, the first to fourth edges are formed at the four end edges of the cross-shaped arm. The first damper device provided with the viscoelastic damper is connected to the first to fourth viscoelastic dampers by means of the connection between the column material on one side and the upper horizontal member, and the column material on the opposite side and the upper horizontal member, respectively. It is attached in a state where it is connected to the joint between the column material and the middle rail on one side, the joint material between the pillar material on the other side and the middle rail, and on the lower side of the middle rail, The second damper device in which the fifth to eighth viscoelastic dampers are provided at the four edges of the cross-shaped arm is the fifth to eighth. Eight viscoelastic dampers, respectively, with one column member and upper horizontal member, opposite column member and upper horizontal member, one column member and middle pier It is attached in the state where it is connected to the joint between the column material on the opposite side and the middle rail, and the following (1) to (3) are satisfied when the interlayer deformation angle is 1/200 rad.
(1) Kbs1, Kbs2, Kbs3, Kbs4, Kbs5, Kbs6, Kbs7, Kbs8 are all 40 kN / cm or more and 200 kN / cm or less (2) Kbs1 / K'ds1, Kbs2 / K'ds2, Kbs3 / K ' ds3, Kbs4 / K'ds4, Kbs5 / K'ds5, Kbs6 / K'ds6, Kbs7 / K'ds7, Kbs8 / K'ds8 are all 1.5 or more and 10 or less. (3) tanδ1, tanδ2, tanδ3 , Tan δ 4, tan δ 5, tan δ 6, tan δ 7, tan δ 8 are all 0.6 or more. It is the attachment rigidity of each attachment part, K'ds1, K'ds2, K'ds3, K'ds4, K'd 5, K′ds6, K′ds7, K′ds8 are the storage rigidity of the first to eighth viscoelastic dampers, respectively, tan δ1, tan δ2, tan δ3, tan δ4, tan δ5, tan δ6, tan δ6, tan δ8, , Each loss coefficient of the first to eighth viscoelastic dampers)

  As in the present invention, the inside is divided into two upper and lower regions, and a first damper device having first to fourth viscoelastic dampers is attached to the upper region, and fifth to eighth viscoelastic dampers are attached to the lower region. In the frame frame to which the second damper device having the above is attached, considering only the horizontal direction, the characteristics of the entire frame frame can be modeled as a 4-series 2-parallel conversion spring as shown in FIG. In FIG. 1, the springs M1, M3, M5, M7, M9, M11, M13, and M15 are shown as elastic elements corresponding to the attachment portions of the first to eighth viscoelastic dampers of the frame. The springs and dashpots of M2, M4, M6, M8, M10, M12, M14, and M16 respectively show the first to eighth viscoelastic dampers as viscoelastic elements.

Therefore, the attachment strength when measured by attaching a rigid body (such as a very rigid steel material) to the frame frame instead of the viscoelastic damper is the approximate value of the frame frame attachment rigidity Kbs (s indicates the horizontal component). The mounting stiffness Kbs1 to Kbs8 of each mounting portion of the first to eighth viscoelastic dampers can be obtained from the mounting stiffness Kbs using the following equations 2 to 4.
1/2 Kbs = 1 / Kbs1 + 1 / Kbs2 + 1 / Kbs3 + 1 / Kbs4 ..2
1/2 Kbs = 1 / Kbs5 + 1 / Kbs6 + 1 / Kbs7 + 1 / Kbs8 ..3
Kbs1 = Kbs2 = Kbs3 = Kbs4 = Kbs5 = Kbs6 = Kbs7 = Kbs8 4

  In the vibration control structure of the present invention, when the amount of interlayer deformation is 1/200 rad or more, the mounting rigidity Kbs1 to Kbs8 required by attaching the rigid body to the frame frame as described above is 40 kN / cm or more and 200 kN / It is necessary to adjust so that it may become cm or less. The interlayer deformation angle is a value obtained by dividing the interlayer displacement of each layer by the height of the floor. When Kbs1 to Kbs8 are less than 40 kN / cm, when the frame is vibrated by an earthquake, the frame frame itself is deformed, and the first to eighth viscoelastic dampers cannot exhibit sufficient damping characteristics. In addition, as a method of increasing Kbs1 to Kbs8, a method of increasing the cross-sectional rigidity of a column member or a horizontal member can be cited. On the contrary, in a design in which Kbs1 to Kbs8 exceeds 200 kN / cm, a frame frame It becomes difficult to apply the construction of a lightweight steel house because the weight of the steel material constituting the steel becomes too large.

  In the vibration control structure of the present invention, the value of the ratio between the mounting rigidity Kbs and the storage rigidity K'ds of the first to eighth viscoelastic dampers obtained as described above (that is, Kbs1 / K'ds1 to Kbs8 / In any case, K′ds8) needs to be 1.5 or more and 10 or less. When Kbs1 / K′ds1 to Kbs8 / K′ds8 is less than 1.5, a certain level of yield strength is exhibited, but the damping performance is impaired. On the contrary, when Kbs1 / K'ds1 to Kbs8 / K'ds8 exceeds 10, when the first to eighth viscoelastic dampers are sufficiently deformed and exhibit damping characteristics when vibrated by an earthquake, the proof stress is It will be damaged.

  Furthermore, in the damping structure of the present invention, the loss coefficients (that is, tan δ1 to tan δ8) of the first to eighth viscoelastic dampers all need to be 0.6 or more. When tan δ1 to tan δ8 is less than 0.6, sufficient attenuation characteristics cannot be obtained. In the present invention, the storage rigidity K′ds1 to K′ds8 of the first to eighth viscoelastic dampers and the loss coefficients tanδ1 to tanδ8 of the first to eighth viscoelastic dampers are the natural frequencies (about 1 to 7 Hz) and measured at room temperature.

The structure of the invention described in claim 2 is that, in the invention described in claim 1, when the interlayer deformation angle is 1/100 rad, the following expression 1 is satisfied.
Fdsmax <Fs 1
(Where Fdsmax is the maximum horizontal strength generated in the frame, and Fs is the allowable horizontal strength of the frame)

In addition, Fdsmax is given by the following equation 5 when the reaction force acting in the axial direction of each viscoelastic damper unit (measured by a tensile compression test of the viscoelastic damper unit) is Fdj. The allowable horizontal proof stress Fs means that the maximum stress degree corresponding to a member is assumed to be an elastic body and the allowable stress degree (that is, a stress that can be allowed for a member that is determined to ensure safety against external force of the structure). It is the load that can act when the limit of the degree is reached.
Fdsmax = 2Fdj × a / √ (a ² + (b / 2) ² ) 5
(However, as shown in the schematic diagram of FIG. 2, a is the width of the frame and b is the height of the frame)

  Further, when configured as in claim 2, it is preferable to configure so as to satisfy the above requirements (1) to (3) even when the interlayer deformation angle is 1/100 rad.

  According to a third aspect of the present invention, in the first or second aspect of the invention, the first to eighth viscoelastic dampers insert an inner core member into the outer cylindrical member. The viscoelastic body is interposed in the gap between the inner core member and the outer cylinder member.

  According to a fourth aspect of the present invention, in the invention according to any one of the first to third aspects, the first to fourth viscoelastic dampers include a cross-shaped arm of the first damper device. It is a core member, and the fifth to eighth viscoelastic dampers have a cross-shaped arm of the second damper device as an inner core member.

  The damping structure of the lightweight steel house according to the present invention is such that the first to eighth viscoelastic dampers have appropriate viscoelasticity, and the entire frame without the first to eighth viscoelastic dampers is moderate. Therefore, when an external force is applied due to an earthquake, each viscoelastic damper is appropriately deformed to exhibit sufficient damping performance. Therefore, the vibration energy due to the earthquake is efficiently converted into thermal energy, so that the deformation of the building can be greatly reduced. Further, as described in claim 2, by adjusting the maximum horizontal proof stress generated in the frame frame to be lower than the allowable horizontal proof strength of the frame frame, a large attenuation can be generated within the allowable proof stress. Moreover, damage to the housing structure due to the generation of an excessive load can be prevented. That is, if the maximum horizontal strength generated in the frame exceeds the allowable horizontal strength, the anchor bolt may drop off, the foundation may be destroyed, or the housing may be damaged. The occurrence of such a situation is prevented. Furthermore, when the first to eighth viscoelastic dampers according to the third aspect are employed, it is possible to easily adjust the viscoelastic characteristics according to the size and shape of the frame.

  Hereinafter, an embodiment of a vibration control structure for a lightweight steel house according to the present invention will be described in detail with reference to the drawings.

  FIG. 3 is a front view illustrating the frame frame according to the first embodiment. The frame 1 is employed in a steel-based prefabricated structure using light-weight steel, and includes a pair of pillar members 2 and 2 disposed at a predetermined interval, and the pillar members 2 and 2. These are assembled into a vertically long rectangular shape having a height of about 2700 mm and a width of about 1000 mm by horizontal members (upper and lower bars) 3 and 3 that connect the upper and lower ends of each. The horizontal members 3 and 3 are made of C-shaped steel, and the column members 2 and 2 are formed by joining the same C-shaped steel as the horizontal material 3 in the width direction. It is. The horizontal members 3 and 3 and the column members 2 and 2 are joined by welding. In addition, the horizontal members 3 and 3 are joined to the beam 9 by welding. The frame 1 has an allowable horizontal proof stress Fs of 30 kN by design.

  Further, between the pillars 2 and 2, an intermediate rail 4 connecting the pillars 2 and 2 at intermediate portions is installed, and the intermediate rail 4 is divided into two upper and lower regions R1 and R2. ing. The middle rail 4 is also formed of C-shaped steel similar to the horizontal members 3, 3, etc., and is joined to the column members 2, 2 by welding.

  On the other hand, the joint portions of the left and right column members 2 and the upper horizontal member 3 and the joint portions of the left and right pillar members 2 and the lower horizontal member 3 of the frame 1 are respectively made of metal. A rigid joint piece 11, 11... Made of a plate is provided. A fixed plate with a bolt insertion hole is provided inside each rigid joint piece 11, 11,... In a folded shape, and is provided in a damper device to be described later using the bolt insertion hole of the fixed plate. The outer end of the formed viscoelastic damper (the portion where the bolt insertion hole is drilled) can be screwed (that is, rigidly joined).

  Further, rigid joint pieces 12, 12,... Made of metal plates are provided above and below the joint portions of the left and right column members 2 and the middle rail 4 of the frame 1 respectively. A fixed plate with a bolt insertion hole is provided inside each rigid joint piece 12, 12,... In a folded shape, and is provided in a damper device to be described later using the bolt insertion hole of the fixed plate. The outer end of the formed viscoelastic damper (the portion where the bolt insertion hole is drilled) can be screwed (that is, rigidly joined).

  The first damper device D1 is attached to the upper region R1 of the frame 1 using the above-described rigid joint pieces 11, 11,... And the rigid joint pieces 12, 12,. A second damper device D2 is attached to the lower region R2 of the frame 1.

  FIG. 4 shows a first damper device D1 having a first viscoelastic damper 5a to a fourth viscoelastic damper 5d. The first damper device D1 is provided with viscoelastic dampers (first viscoelastic damper 5a to fourth viscoelastic damper 5d) having the same characteristics at each end of a cross-shaped arm having a rectangular cross section. The lengths from the central portion to the four outer edges (from the first viscoelastic damper 5a to the outer edge of the fourth viscoelastic damper 5d) are all equal. The first damper device D1 and the second damper device D2 have the same structure and the same standard.

  Further, the first viscoelastic damper 5a provided in the first damper device D1 is a cylindrical outer cylinder having a rectangular cross section that is slightly larger than the arm 7 on the outer periphery on the distal end side of the arm 7 of the first damper device D1. It is covered with the member 6. A viscoelastic body 8 is interposed in the gap between the arm 7 and the outer cylinder member 6. Further, a bolt insertion hole 9 in which a thread groove is screwed is formed in the outer edge of the outer cylinder member 6. The first viscoelastic damper 5a to the fourth viscoelastic damper 5d attached to the first damper device D1 and the fifth viscoelastic damper 5e to the eighth viscoelastic damper 5h attached to the second damper device D2 are all The same structure and the same standard.

  The first damper device D1 rigidly joins the outer edge of the first viscoelastic damper 5a to the rigid joining piece 11 provided at the joint between the left column member 2 and the upper horizontal member 3. The outer edge of the second viscoelastic damper 5b is rigidly joined to a rigid joining piece 11 provided at the joint between the right column member 2 and the upper horizontal member 3. The outer side of the third viscoelastic damper 5c Are rigidly joined to a rigid joining piece 12 provided at the joint between the left pillar 2 and the middle rail 4, and the outer edge of the fourth viscoelastic damper 5d is joined to the right pillar 2 And attached to the upper region R1 of the frame 1 in a state of being rigidly joined to the rigid joining piece 12 provided at the joint portion between the intermediate frame 4 and the intermediate rail 4. On the other hand, the second damper device D2 rigidly joins the outer edge of the fifth viscoelastic damper 5e to the rigid joining piece 12 provided at the joint between the left column member 2 and the middle rail 4. The outer edge of the sixth viscoelastic damper 5f is rigidly joined to the rigid joint piece 12 provided at the joint between the right column 2 and the middle rail 4. The outer edge of the seventh viscoelastic damper 5g is The left column member 2 and the lower horizontal member 3 are rigidly joined to a rigid joint piece 11 provided at the joint portion, and the outer edge of the eighth viscoelastic damper 5h is connected to the right column member 2 In the state of being rigidly joined to the rigid joining piece 11 provided at the joint portion between the frame member 3 and the lower horizontal member 3, it is attached to the lower region R 1 of the frame 1.

  The first viscoelastic damper 5a to the fourth viscoelastic damper 5d of the first damper device D1 are used when a relative displacement occurs between the left and right column members 2 and 2 or between the upper horizontal member 3 and the middle. When relative displacement occurs between the crosspiece 4 (that is, when it is displaced up and down or left and right), the viscoelastic body 8 is subjected to shear deformation, thereby exhibiting damping performance. On the other hand, the fifth viscoelastic damper 5e to the eighth viscoelastic damper 5h of the second damper device D2 are used when a relative displacement occurs between the left and right column members 2 and 2 or with the lower horizontal member 3. When relative displacement occurs between the middle rail 4 (that is, when it is displaced up and down or left and right), the viscoelastic body 8 is subjected to shear deformation to exhibit damping performance. .

  In the frame 1 of the first embodiment, when only the horizontal direction is considered, the viscoelastic characteristics can be modeled as a 4-series 2-parallel conversion spring as shown in FIG. The attachment strength when the rigid body (a cross-shaped metal plate or the like similar to the first damper device D1) is attached instead of the first damper device D1 having the four viscoelastic dampers 5d is measured. It can be approximated as Kbs. Further, in the frame frame 1, each region R1, R2 is vertically symmetric about the middle rail 4, so that the first viscoelastic damper 5a to the eighth viscoelastic damper of the first damper device D1 and the second damper device D2. The above formulas 2 to 4 are established among the mounting rigidity Kbs1 to Kbs8 of 5h and the mounting rigidity Kbs1 to Kbs8 of the first viscoelastic damper 5a to the eighth viscoelastic damper 5h.

  Therefore, between the rigid joint pieces 11 and 11 and the rigid joint pieces 12 and 12 in the upper and lower regions R1 and R2, instead of the first viscoelastic damper 5a to the eighth viscoelastic damper 5h, a rigid body having substantially the same shape (first A cross-shaped metal plate similar to one damper device D1 is attached, and in that state, the frame 1 is horizontally deformed so that the interlayer deformation angle is 1/200 rad (in the direction of the arrow in FIG. 3), and the applied stress The attachment rigidity Kbs of the frame 1 is calculated from the relationship between the deformation and the deformation amount, and the attachment rigidity Kbs1 to Kbs8 of each attachment part of the first viscoelastic damper 5a to the eighth viscoelastic damper 5h is calculated using the above equations 2-4. Was calculated. The calculated value of the attachment rigidity Kbs of the frame 1 was 56.3 kN / cm. Table 1 shows the calculation results of the mounting rigidity Kbs1 to Kbs8. Table 2 shows the calculation results of the attachment rigidity Kbs1 to Kbs8 when the frame 1 is horizontally deformed so that the interlayer deformation angle becomes 1/100 rad.

On the other hand, the storage rigidity K′ds1 to K′ds8 of the first viscoelastic damper 5a to the eighth viscoelastic damper 5h is calculated by the following expression 6, respectively.
K′ds1 to K′ds8 = G × S / d 6
In the above equation 6, G is a shear elastic modulus, and in calculating K′ds1 to K′ds8, the shear elastic modulus G was set to 0.18 N / mm ² from the characteristics of the viscoelastic body. S is the area of each viscoelastic body 8 of the first viscoelastic damper 5a to the eighth viscoelastic damper 5h, and d is the thickness of each viscoelastic body 8 (the thickness of the viscoelastic body 8 alone).

  Therefore, the area S and the thickness of each viscoelastic body 8 of the first viscoelastic damper 5a to the eighth viscoelastic damper 5h so that the storage rigidity K′ds1 to K′ds8 are the values shown in Table 1, respectively. d was adjusted (that is, the first viscoelastic damper 5a to the eighth viscoelastic damper 5h were designed so that the storage rigidity K′ds1 to K′ds8 was a numerical value shown in Table 1).

  Further, the respective loss coefficients tan δ1 to tan δ8 of the first viscoelastic damper 5a to the eighth viscoelastic damper 5h were measured. The loss factors tan δ1 to tan δ8 are measured using a dynamic shaker (manufactured by Kakinomiya Seisakusho Co., Ltd.) and a 200% shear strain using a 2 Hz sine wave in an atmosphere of 20 ° C. When applied, deformation-loading was performed by examining the behavior. Table 1 shows the measurement results of the loss coefficients tan δ1 to tan δ8.

  After obtaining the mounting rigidity Kbs and the mounting rigidity Kbs1 to Kbs8 of the frame 1 as described above, the rigid body is removed from between the rigid joint pieces 11 and 11 and the rigid joint pieces 12 and 12 in the upper and lower regions R1 and R2, The first damper device D1 having the first viscoelastic damper 5a to the fourth viscoelastic damper 5d and the second damper device having the fifth viscoelastic damper 5e to the eighth viscoelastic damper 5h in the regions R1 and R2, respectively. D2 was attached. As described above, in the frame 1 to which the first viscoelastic damper 5a to the eighth viscoelastic damper 5h are attached, the value of Kbs1 / K'ds1 is considered in consideration of the storage rigidity K'ds1 to K'ds8 and the attachment rigidity Kbs1 to Kbs8. Is adjusted to 5.14, the value of Kbs2 / K'ds2 is adjusted to 5.17, and the value of Kbs3 / K'ds3 is adjusted to 5.15. Therefore, the value of Kbs4 / K'ds4 is adjusted to 5.13, the value of Kbs5 / K'ds5 is adjusted to 4.90, and Kbs6 / The value of K'ds6 is adjusted to 5.00, the value of Kbs7 / K'ds7 is adjusted to 5.13, and the value of Kbs8 / K'ds8 is 4 .99 adjusted Become Rukoto (see Table 1).

  Then, in the frame 1 to which the first viscoelastic damper 5a to the eighth viscoelastic damper 5h are attached, the frame 1 is horizontally placed so that the interlayer deformation angle is 1/200 rad using a large dynamic vibrator. The storage stiffness K′as, the loss stiffness K ″ as, and the loss coefficient tanδa of the entire system are measured from the deformation-load relationship, and the horizontal components tanδa / tanδ1 and tanδa / tanδ2 that serve as indicators of the damping characteristics are measured. The calculation results are shown in Table 1. Further, tan δa / tan δ1 and tan δa / tan δ2 when the frame 1 is deformed in the horizontal direction so that the interlayer deformation angle is 1/100 rad are shown in Table 2.

  Further, the maximum horizontal proof stress Fdsmax generated in the frame 1 at the time of deformation of the interlayer deformation angles of 1/200 rad and 1/100 rad was calculated based on the above formula 5. Tables 1 and 2 show the calculated Fdsmax.

  The rigid joint pieces 11, 11,... In the upper and lower regions R1, R2 of the frame 1 of the first embodiment are changed to pin joint pieces 13, 13,. The rigid joint pieces 12, 12,... Of R1, R2 are changed to pin joint pieces 14, 14,... Having pin insertion holes that can be pin-coupled (see FIG. 5). As in the first embodiment, a rigid body (a cross-shaped metal plate similar to the first damper device D1) is provided between the pin joint pieces 13 and 13 and the pin joint pieces 14 on the left and right of the upper and lower regions R1 and R2. In this state, the frame 1 is horizontally deformed so that the interlayer deformation angle is 1/200 rad (in the direction of the arrow in FIG. 5), and the mounting rigidity Kbs of the frame 1 is determined from the relationship between the applied stress and the amount of deformation. And the mounting stiffness Kbs1 to Kbs8 of each mounting portion of the first viscoelastic damper to the eighth viscoelastic damper was calculated using the above equations 2 to 4. The calculated value of the mounting rigidity Kbs of the frame 1 was 49.0 kN / cm. Table 1 shows the calculation results of the mounting rigidity Kbs1 to Kbs8. Table 2 shows the calculation results of the attachment rigidity Kbs1 to Kbs8 when the frame 1 is horizontally deformed so that the interlayer deformation angle becomes 1/100 rad.

  FIG. 6 shows the first damper device D11 attached to the upper region R1 of the frame 1 of the second embodiment. Note that the second damper device D12 attached to the lower region R2 of the frame 1 of the second embodiment has the same structure and the same standard as the first damper device D11. Similar to the first damper device D1 of the first embodiment, the first damper device D11 of the second embodiment has viscoelastic dampers (first viscosity) having the same characteristics at each end of the cross-shaped arm having a rectangular cross section. Elastic damper 5a to fourth viscoelastic damper 5d), from the central portion to the four outer edges (from the first viscoelastic damper 5a to the outer edge of the fourth viscoelastic damper 5d). All the lengths are equal. However, the structure of the outer edge of the first viscoelastic damper 5a to the fourth viscoelastic damper 5d is different from the first damper device D1 of the first embodiment.

  The first viscoelastic damper 15a to the fourth viscoelastic damper 15d provided in the first damper device D11 are the same in terms of standards, and the first viscoelastic damper provided in the first damper device D1 of the first embodiment. Although it is substantially the same as the structure of 5a-4th viscoelastic damper 5d, the shape of the outer edge of the outer cylinder member 6 is different from that of the first embodiment. That is, a pin coupling member 16 having a pin insertion hole is fixed to the outer edge of the outer cylinder member 6 of the first viscoelastic damper 15a to the fourth viscoelastic damper 15d. The shapes and structures of the other parts of the first viscoelastic damper 15a to the fourth viscoelastic damper 15d provided in the first damper device D11 are the same as those of the first viscoelastic damper provided in the first damper device D1 of the first embodiment. The same as 5a to the fourth viscoelastic damper 5d. The first viscoelastic damper 15a to the fourth viscoelastic damper 15d attached to the first damper device D11 and the fifth viscoelastic damper 15e to the eighth viscoelastic damper 15h attached to the second damper device D12 are The storage rigidity (K′ds1 to K′ds8) is adjusted so as to be the values shown in Table 1.

  Further, the first viscoelastic damper 15a to the fourth viscoelastic damper 15d attached to the first damper device D11 and the fifth viscoelastic damper 15e to the eighth viscoelastic damper 15h attached to the second damper device D12. Each loss coefficient tan δ1 to tan δ8 was measured by the same method as in Example 1. The measurement results are shown in Table 1.

  Thereafter, the first damper device D11 having the first viscoelastic damper 15a to the fourth viscoelastic damper 15d between the pin joint pieces 13 and 13 and the pin joint pieces 14 and 14 in the upper region R1 of the frame 1 is installed. The second viscoelastic damper 15e is attached in the same manner as in the first embodiment, and the fifth viscoelastic damper 15h to the eighth viscoelastic damper 15h are provided between the pin joint pieces 13 and 13 and the pin joint pieces 14 and 14 in the lower region R2. The damper device D12 was attached in the same manner as in Example 1.

  Then, similarly to the first embodiment, using a large dynamic vibrator, the frame frame 1 is deformed in the horizontal direction so that the interlayer deformation angle is 1/200 rad. Storage stiffness K′as, loss stiffness K ″ as, and loss coefficient tan δa were measured, and horizontal components tan δa / tan δ1 and tan δa / tan δ2 serving as indexes of damping characteristics were calculated. The calculation results are shown in Table 1. Tan δa / tan δ1 and tan δa / tan δ2 when the frame 1 is deformed in the horizontal direction so that the interlayer deformation angle is 1/100 rad are shown in Table 2. The first viscoelastic damper 15a to the eighth viscoelastic damper. In the frame 1 of the second embodiment to which 15h is attached, the storage rigidity K′ds1 to K′d of the first viscoelastic damper 15a to the eighth viscoelastic damper 15h. 8 and each mounting rigidity Kbs1 to Kbs8, the value of Kbs1 / K'ds1 is adjusted to 4.93, and the value of Kbs2 / K'ds2 is adjusted to 5.01. Thus, the value of Kbs3 / K'ds3 is adjusted to 4.98, the value of Kbs4 / K'ds4 is adjusted to 5.01, and the value of Kbs5 / K'ds5 is It is adjusted to 4.93, the value of Kbs6 / K'ds6 is adjusted to 4.98, and the value of Kbs7 / K'ds7 is adjusted to 4.90. Thus, the value of Kbs8 / K′ds8 is adjusted to 5.03 (see Table 1).

  Further, the maximum horizontal proof stress Fdsmax generated in the frame 1 at the time of deformation of the interlayer deformation angles of 1/200 rad and 1/100 rad was calculated based on the above formula 5. Tables 1 and 2 show the calculated Fdsmax.

  From Tables 1 and 2, the mounting rigidity Kbs1 to Kbs8 of the first to eighth viscoelastic damper mounting portions of the frame 1 is stored, the storage rigidity K'ds1 to K'ds4 of the first to eighth viscoelastic dampers, first. In the frame 1 of the first and second embodiments in which the loss coefficients tan δ1 to tan δ8 of the eighth viscoelastic damper are adjusted so as to satisfy the conditions of the present invention, the horizontal component tan δa / tan δ1, which serves as an index of the damping characteristic It can be seen that tan δa / tan δ2 is 50% or more, and good attenuation characteristics can be exhibited. Also, from Tables 1 and 2, it can be seen that the maximum horizontal strength Fdsmax generated in the frame 1 in Examples 1 and 2 is sufficiently smaller than the allowable horizontal strength Fs (30 kN) of the frame 1. .

  In addition, the structure of the light-damped steel house vibration control structure of the present invention is not limited to the aspect of the above-described embodiment, and the structure of the frame frame, the viscoelastic damper, and the like is within the scope of the present invention. It can be changed as appropriate.

  For example, in the present invention, the value of the storage rigidity K'ds of the first to eighth viscoelastic dampers can be appropriately adjusted according to the value of the mounting rigidity Kbs of the frame frame. Therefore, the characteristics of the first to eighth viscoelastic dampers can be appropriately changed according to the application. Therefore, various polymer compounds such as rubber, asphalt, acrylic, and styrene can be suitably used as the viscoelastic body. Further, the first to eighth viscoelastic dampers provided in the damper device cover the outer periphery of the arm functioning as the inner core member with the outer cylinder member as in the above embodiment, and viscoelasticity is formed in the gap between the arm and the outer cylinder member. It is not limited to those with a body interposed, but is changed to one with a viscoelastic body interposed between a core plate and a pair of outer plates, or with a viscoelastic body between a pair of front and back plates It is also possible to do.

In addition, the frame frame employed in the vibration control structure of the present invention is not limited to the one in which the damper device provided with the viscoelastic damper having the same characteristics as in the above embodiment is mounted above and below the middle rail,
It is also possible to change the damper device provided with viscoelastic dampers having different characteristics to those attached to the top and bottom of the middle rail. Even in such a case, if Kbs1 to Kbs8, K′ds1 to K′ds8, and tan δ1 to tan δ8 are adjusted to satisfy the predetermined relationship, the frame frame can exhibit sufficient attenuation performance. .

It is explanatory drawing which models and shows the frame frame of this invention as 4 series 2 parallel conversion springs. It is a schematic diagram which shows the frame frame of this invention. It is a front view of the frame frame of Example 1. (A) is a front view of the damper apparatus of Example 1, (b) is the sectional view on the AA line in (a). It is a front view of the frame frame of Example 2. (A) is a front view of the damper apparatus of Example 2, (b) is the BB sectional drawing in (a).

Explanation of symbols

  1 ・ ・ Framework frame 2 ・ ・ Column material 3 ・ ・ Horizontal material 4 ・ ・ Medium cross 5a, 15a ・ ・ First viscoelastic damper, 5b, 15b ・ ・ Second viscoelastic damper, 5c, 15c · · Third viscoelastic damper, 5d, 15d · · Fourth viscoelastic damper, 5e, 15e · · Fifth viscoelastic damper, 5f, 15f · · Sixth viscoelastic damper, 5g, 15g · · Seventh viscoelastic Damper, 5h, 15h .. Eighth viscoelastic damper, 6 .... Outer cylinder member, 7 .... Inner core member, 8 .... Viscoelastic body, D1, D11 ... First damper device, D2, D12 ... Two damper device.

Claims (4)

It is a light-damping structure for light-weight steel houses, with viscoelastic dampers installed on a frame frame composed of left and right pillars and upper and lower horizontal members.
The inside of the frame is divided into two upper and lower regions by a middle rail, and in the upper region of the middle rail,
A first damper device in which first to fourth viscoelastic dampers are provided at four edges of a cross-shaped arm, the first to fourth viscoelastic dampers are respectively connected to a column member on one side and an upper horizontal member. The connection between the column material on the opposite side and the horizontal member on the upper side, the connection between the column material on one side and the middle beam, and the connection between the column material on the other side and the middle beam It is attached with
Under the middle rail,
The second damper device provided with the fifth to eighth viscoelastic dampers on the four edges of the cross-shaped arm, the fifth to eighth viscoelastic dampers, respectively, with the column member on one side and the horizontal member on the upper side, respectively. The connection between the column material on the opposite side and the horizontal member on the upper side, the connection between the column material on one side and the middle beam, and the connection between the column material on the other side and the middle beam It is attached with
When the interlayer deformation angle is 1/200 rad, the following structure (1) to (3) is satisfied.
(1) Kbs1, Kbs2, Kbs3, Kbs4, Kbs5, Kbs6, Kbs7, Kbs8 are all 40 kN / cm or more and 200 kN / cm or less (2) Kbs1 / K'ds1, Kbs2 / K'ds2, Kbs3 / K ' ds3, Kbs4 / K'ds4, Kbs5 / K'ds5, Kbs6 / K'ds6, Kbs7 / K'ds7, Kbs8 / K'ds8 are all 1.5 or more and 10 or less. (3) tanδ1, tanδ2, tanδ3 , Tan δ4, tan δ5, tan δ6, tan δ7, tan δ8 are all 0.6 or more (provided that Kbs1, Kbs2, Kbs3, Kbs4, Kbs5, Kbs6, Kbs7, Kbs8 are the first to eighth viscoelastic dampers, respectively. It is the attachment rigidity of each attachment part, K'ds1, K'ds2, K'ds3, K'ds4, K'd 5, K′ds6, K′ds7, K′ds8 are the storage rigidity of the first to eighth viscoelastic dampers, respectively, tan δ1, tan δ2, tan δ3, tan δ4, tan δ5, tan δ6, tan δ6, tan δ8, , Each loss coefficient of the first to eighth viscoelastic dampers) 2. The light-damped steel house vibration control structure according to claim 1, wherein the following expression 1 is satisfied when the interlayer deformation angle is 1/100 rad.
Fdsmax <Fs 1
(Where Fdsmax is the maximum horizontal strength generated in the frame, and Fs is the allowable horizontal strength of the frame)   The first to eighth viscoelastic dampers are characterized in that an inner core member is inserted into an outer cylinder member, and a gap between the inner core member and the outer cylinder member is filled with a viscoelastic body. The building vibration control structure according to claim 1 or claim 2.   The first to fourth viscoelastic dampers have cross-shaped arms of the first damper device as inner core members, and the fifth to eighth viscoelastic dampers have a cross shape of the second damper device. The building's seismic control structure according to any one of claims 1 to 3, wherein said arm is an inner core member.

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