JP2556239B2 - Seismic frame for bending yield type damping device - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a seismic-resistant frame for a bending-yield type seismic control device, which prevents an excessive load from being input to the seismic control device that controls the resistance of seismic elements.

[0002]

A vibration damping element such as a variable rigidity device for adjusting damping force and a variable damping device for controlling damping force, a high damping device, an energy absorbing device, etc. The device connects one to the frame,
Since the other is separated from the frame and installed across the frame and the seismic resistant element that causes relative displacement with the frame, if the strength of the seismic resistant element is greater than the strength of the seismic control device, excessive horizontal force acts. When this happens, the load is concentrated on the seismic control device, and excessive stress is applied to it, which may damage the seismic control device when the allowable load capacity is exceeded.

The present invention has been made in view of the problem in using the vibration control device, and proposes a seismic frame that functions as a seismic element while preventing damage to the vibration control device.

[0004]

SUMMARY OF THE INVENTION According to the present invention, two high-rigidity members for connecting an earthquake-resistant frame to a frame at a distance from each other in a plane of the frame, and a bend for connecting the two members across the high-rigidity members. It is composed of a yielding member, and the horizontal yield strength determined by the yield strength of the bending yielding member is set lower than the allowable yield strength of the seismic control device so that the bending yielding member bears the horizontal force when an excessive horizontal force acts on it. Therefore, the input of stress exceeding the set value to the vibration control device is avoided, and the situation of the damage is prevented.

One end of the high-rigidity member is rigidly joined to the frame, the other end of the high-rigidity member faces each other with a distance therebetween, and a bending yield member is rigidly joined to both ends of the high-rigidity members. The earthquake-resistant frame resists horizontal force as a rigid frame structure.
The damping device is connected to the bending yield member and transfers the horizontal force of the frame from the bending yield member to the seismic frame.

Since the yield strength of the seismic frame is set lower than the yield strength of the seismic damper, the bending yield member bears the horizontal force when an excessive horizontal force is applied, and has a high rigidity before reaching the allowable seismic strength of the seismic damper. Yield prior to the member. The bending yield member yields with a load smaller than the proof stress of the vibration control device, so that the effect of stress above that load on the vibration control device is avoided, and the vibration control device is kept sound even when an excessive horizontal force is applied. . The seismic frame maintains the function of the seismic control device by continuing to bear the horizontal force even after the yielding of the bending yielding member.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the drawings showing an embodiment.

As shown in FIG. 1, the earthquake-resistant frame 1 of the present invention includes two high-rigidity members 2 and 2 which are rigidly joined to the frame 4 at a distance from each other in the plane of the frame 4 of columns and beams. At the same time as being rigidly joined to both of the high-rigidity members 2 and 2, they are composed of a bending yield member 3 to which a vibration control device 5 connected to a frame 4 is connected, and determined by the yield strength of the bending yield member 3. By setting the horizontal proof strength lower than the allowable proof strength of the vibration control device 5, it is possible to avoid the input of excessive stress to the vibration control device 5.

One of the seismic frame 1 is connected to the frame 4,
The other is separated from the frame 4 and is assembled so that it can be displaced relative to the frame 4.

The seismic frame 1 is assembled at a location where relative displacement with respect to the frame 4 occurs in the plane of the frame 4 during interlayer displacement, and the seismic damping device 5 installed between the frame 4 and the frame 4 provides resistance and damping. Power etc. is controlled. Vibration control device 5
Is selected according to the purpose of controlling the seismic frame 1, and the function and structure of the seismic control device 5 are not limited in this invention.

One end of each of the high-rigidity members 2 and 2 is located on the lower floor side or the upper floor side of the frame 4 as shown in the figure, or one of the pillar sides, depending on the installation position of the vibration control device 5 in the frame 4. , The frames 4 are spaced apart from each other in the plane of the frame 4.
Is rigidly joined to. The other ends of the high-rigidity members 2 and 2 are opposed to each other with a distance corresponding to the length of the bending yield member 3 installed.

[0012] Flexural Yield member 3 is, for example, vibration control device 5 movable portion 5 ₁ of the moving direction which is the working direction, that is, seismic Frame 1 and the intermediate portion 3 ₁ relative displacement direction parallel between the frame 4, the rigid member 2, ₂ and ₂ are assembled in a mountain shape from connecting portions 3 ₂ and 3 ₂ which are connected to the ₂ and ₂ and are rigidly joined to both sides of the high-rigidity members 2 and 2 across the other ends. In this case, the high-rigidity members 2 and 2 and the bending yielding member 3 form a trapezoidal rigid frame in the frame 4, but both are combined into a shape in which the bending yielding member 3 yields due to the load transmitted from the vibration control device 5. The seismic frame 1 can be assembled in an arbitrary elevation shape.

The vibration control device 5 is installed so as to straddle the intermediate portion 3 ₁ of the bending yielding member 3 and the frame 4, and the movable portion 5 ₁ is connected to the intermediate portion 3 ₁ so that the horizontal force of the frame 4 is bent and yielded. The seismic frame 1 transmits to the member 3 and resists horizontal force while bearing bending moment and shearing force as a rigid frame structure.

The horizontal yield strength of the seismic resistant frame 1 is determined by the yield yield strength of the bending yield member 3. However, by setting it lower than the allowable yield strength of the seismic damping device 5, the bending yield member increases as the horizontal force applied to the earthquake resistant frame 1 increases. 3 precedes the high rigidity member 2,
Yield with a horizontal force smaller than the proof stress of the seismic control device 5, and after yielding, as shown in Fig. 6, the plastic deformation capacity causes deformation to proceed and suppresses the increase in horizontal force, and also increases the stress on the seismic control device 5. Prevent.

As shown in FIGS. 3 to 5, which are sectional views taken along line xx line, yy line, and zz line in FIG. 2, the seismic frame 1 functions effectively in the plane of the frame 4. When H-shaped steel is used for the rigid member 2 and the bending yield member 3, the strong axis of each H-shaped steel is oriented in the in-plane direction and the in-plane bending moment of the frame 4 is received around the weak axis. By being arranged, the rigidity of the frame 4 in the out-of-plane direction is enhanced. In this case, the high-rigidity member 2 is provided with stiffeners 2 ₁ and 2 ₁ between both ends of the flange as shown in FIG. 3, so that higher rigidity and strength than the bending yield member 3 are secured. In this case, the rigid member 2, the in-plane direction of the rigid frame 4 is adjusted by 2 _1, 2 ₁ of the plate thickness size stiffener. Bending yield member 3
In particular, H-section steel having a small flange width-thickness ratio is used in order to have plastic deformation ability.

[0016] It flexural strength axis of H-section steel that is used to yield member 3 as in the high-rigidity member 2 oriented in-plane direction other that facilitates bonding between the rigid member 2, resulting in the intermediate portion 3 ₁ it possible to increase the shear cross sectional area relative to large shear forces, also prevent lateral collapse buckling due to the axial force of the two connection portions 3 _2, 3 _2, decrease in yield strength bending due to the influence of the axial force Has the effect of reducing.

FIG. 6 shows the relationship between the horizontal force and the deformation of the seismic frame 1. As shown here, since the horizontal force does not increase after the yielding of the bending yield member 3, the bending yield member is not increased. By setting the yield strength of No. 3 to an appropriate value less than the allowable yield strength of the seismic damping device 5, the bending yield member 3 yields at a load of less than that value, and the action on the seismic damping device 5 of a load exceeding that value is exerted. In order to prevent this, input of excessive stress to the vibration control device 5 is avoided.

In the seismic frame 1, the bending yield member 3 yields and is plastically deformed to avoid applying a load equal to or more than that value to the seismic control device 5. However, as shown in FIG. By continuing to exert the resistance of
Has the role of sustaining the seismic control effect.

Further, a large deformation exceeding the allowable stroke of the movable part 5 ₁ of the vibration control device 5 connected to the seismic frame 1 causes a large deformation in the frame 4.
In the case that occurred becomes a state where the movable portion 5 ₁ and Vibration Control device 5 frames 4 and Seismic Frames 1 in mechanical contact is coupled to the rigid, there is a possibility that a large force is applied to the vibration control apparatus 5 However, since the seismic resistant frame 1 yields while bearing a horizontal force to suppress an increase in the stress input to the vibration control device 5, the damage to the vibration control device 5 is also prevented at this time. This earthquake-resistant frame 1
Since the yield strength of the building can be considered as an increment of the horizontal strength of the building, the earthquake-resistant frame 1 plays a role of protecting the building together with the seismic damper 5 by increasing the strength of the building.

[0020]

The present invention is as described above, and two high-rigidity members facing each other in the plane of the frame and rigidly joined to the frame, and rigidly joined to both of them across the high-rigidity members. The horizontal yield strength determined by the yield strength of the bending yield member is set lower than the allowable yield strength of the seismic control device.Therefore, when an excessive horizontal force is applied, the horizontal force is applied to the bending yield member. By surrendering this while giving a load, it is possible to avoid the input of excessive stress to the vibration control device, and to keep the vibration control device sound. Moreover, since the seismic-resistant frame exerts the force equivalent to the yield strength even after the bending yield member yields, it is possible to maintain the function of the vibration control device.

In addition, even when the seismic resistant frame and the frame are connected to each other through the seismic damper due to deformation beyond the allowable stroke of the seismic damper, the seismic resistant frame yields to the seismic damper. Since the horizontal force is borne while avoiding the input of excessive stress, the yield strength at that time is added to the yield strength of the building, and the horizontal strength of the building can be increased.

[Brief description of drawings]

FIG. 1 is an elevation view showing an example of construction of a seismic frame.

FIG. 2 is an elevation view showing details of the earthquake-resistant frame.

FIG. 3 is a sectional view taken along line xx of FIG.

FIG. 4 is a sectional view taken along line yy of FIG.

5 is a sectional view taken along line zz of FIG.

FIG. 6 is a load-deformation curve diagram of the earthquake-resistant frame.

[Explanation of symbols]

1 …… Seismic frame, 2 …… High-rigidity member, 2 ₁ …… Stiffener,
3 …… Bending yield member, 3 ₁ …… Intermediate part, 3 ₂ …… Connecting part, 4
…… Frame, 5 …… Vibration control device, 5 ₁ …… Movable part.

Claims (1)

(57) [Claims] Claim: What is claimed is: 1. One of the frames is connected to a frame of a pillar / beam, the other is separated from the frame so as to be relatively deformable with respect to the frame, and the seismic control device connected to the frame is connected to the separated side. It is a seismic frame that bears the horizontal force transmitted from the seismic control device during in-plane deformation. Two high-rigidity members, one end of which is rigidly joined to the frame at a distance from each other within the plane of the frame, The horizontal yield strength determined by the yield strength of the bending yield member is composed of a bending yield member that is rigidly joined to both ends of the rigid member and connected to the damping device at the same time. Seismic frame for bending yield type damping device characterized by being set lower.