JPH11117569A - Steel-made vibration control damper - Google Patents

Abstract

PROBLEM TO BE SOLVED: To absorb vibration energy by plastic deformation of the opening peripheral edge part of a plate-like steel material in an earthquake and attenuate fluctuation of a main frame by connecting the main frame through the plate-like steel material forming a plurality of openings. SOLUTION: With regard to a steel-made vibration control damper 1, a plurality of bolt holes 1d for joining the other member on the circumference of the center part of a plate-like steel plate 1a composed of a low yield point steel of 200 MPa or less are drilled, a plurality of rectangular openings 1c are provided in the outside, and a stiffener 1e composed of common steel, high strength steel, TMCP steel or the like is welded to an outer edge. A steel-made vibration control damper 1 is attached to both the faces of the web 2a of H shape steel 2 through a spacer 1g by a high strength bolt 3, and connected to the other member through the steel-made vibration control damper 1 to constitute a main frame. Thereby the peripheral edge part of the opening 1c is plastically deformed by bending moment generated in the face of the plate-like steel material 1a at the time of earthquake to absorb vibration energy so as to attenuate fluctuation of the main frame.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a steel frame which is incorporated into a main frame, and which absorbs vibration energy caused by an earthquake or the like by plastically deforming when inter-story displacement of the frame occurs, thereby damping the shaking of the main frame. About vibration dampers.

[0002]

2. Description of the Related Art Conventionally, structures have been designed based on seismic design methods. According to the seismic design method, each part of the structure vibrates within the elastic range in the event of a moderately-occurring moderate earthquake, but it does not respond to a large earthquake that is expected to occur once in several decades. Allows plastic deformation of the object. The basis of this concept is to prevent the collapse and intrusion of structures to protect human lives, to give structures sufficient deformation capacity, and to produce plastic deformation due to large earthquakes.
Once such a structure has been hit by a major earthquake, it is often enormously expensive to repair and practically difficult to continue using.

On the other hand, in recent years, especially since the Great Hanshin Earthquake,
There has been an increasing demand for a design method that does not cause large plastic deformation in the main frame of a structure even after a large earthquake.

The following three methods have been proposed as techniques for responding to this. The first method is to incorporate seismic isolation members and reduce the input of seismic waves to the structure (Japanese Patent Laid-Open No. 8-15897). This method is easy to deform, a member that can support the upper structure even after large deformation,
That is, the seismic isolation member is interposed between the building structure and the foundation to limit the input of seismic waves to the structure to long-period seismic waves and suppress the input of short-period seismic waves having large vibration energy. At the same time, various dampers are combined to reduce the energy of seismic waves including short-period seismic waves.
As the seismic isolation member, usually, a laminated rubber in which a thin sheet-like rubber and a steel plate are laminated is used.

A second method is a method of concentrating seismic wave energy on a steel member and absorbing vibration energy based on repeated plastic deformation of a steel member constituting the member (Japanese Patent Laid-Open No. 6-57820). Gazette). This method
As a steel member that concentrates seismic energy, a yield-type brace with a structure that prevents premature buckling is selected.Ultra-low yield point steel is used as the core of the yield-type brace. High yield point steel is used for the material. As a result,
The energy of the seismic wave is concentrated in the core material of the yielding brace,
Vibration energy is absorbed based on the repeated plastic deformation of the core material, so that large plastic deformation does not occur in the columns and beams as the main structures.

A third method is to use a vibration damper for plastically deforming a steel material such as a flat plate (Japanese Patent Laid-Open No. 2-3).
00475). In this method, an elasto-plastic damper (a steel plate provided with a slit) and a viscoelastic damper are arranged between walls fixed to one of the upper and lower beams and the other, respectively. When the vibration is small, the vibration is absorbed by the viscoelastic damper, and the amplitude of the vibration is further increased. When the vibration cannot be absorbed only by the viscoelastic damper, the vibration energy is absorbed by the plastic deformation of the elasto-plastic damper.

[0007] All three of the above methods, in the event of an earthquake,
It is expected to exhibit the effect of absorbing vibration energy and preventing the main frame from undergoing large plastic deformation. However, there are problems that the manufacturing cost of the vibration damper and the like is expensive and that the weight increase of the structure cannot be ignored. For this reason, there has been a demand for the development of a vibration damper that can be easily attached and detached, and that exhibits compact and stable vibration control characteristics.

[0008]

SUMMARY OF THE INVENTION It is an object of the present invention to provide an inexpensive, easily attachable and detachable steel vibration damper which can be applied compactly to any structure and exhibits stable vibration damping characteristics. .

[0009]

Means for Solving the Problems The inventors of the present invention installed a plate-shaped steel vibration damper between members where displacement and the like occur due to vibration, and when the displacement and the like occur between members, the steel vibration damper and the like. Invented a mechanism that causes plastic deformation caused by a shift in the in-plane rotation angle between the vicinity of the center of the plate surface and the outer peripheral portion. This vibration damper can be bolted to other members and can be easily replaced after a disaster.

The gist of the present invention resides in the following vibration damper.

[0011] A plate-like steel material in which a stiffener made of a steel material is disposed on part or all of the outer periphery, and a plurality of openings are formed around a region having a center near the center of the plate surface of the plate-like steel material. Steel vibration damper provided with. The above-mentioned "plate-shaped steel material" is made of, for example, a thick steel plate, and its outer shape may be a circle, a polygon, an ellipse, or the like. Further, its thickness does not need to be constant throughout the sheet steel material. The “region” around which an opening is provided may be a region inside a circle, or may be a region surrounded by an ellipse, a curve close to a rectangle, or the like if plastic deformation is easy on the periphery of the opening. A bolt hole may be provided in this area. The size of the area can be changed according to the size of the structure, an assumed large earthquake, or the like.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 shows a steel vibration damper 1 according to an embodiment of the present invention in which an opening 1c is provided along a region having a center near a center 1b of a plate-like steel material 1a having a stiffener 1e provided on an outer edge thereof. FIG. In this figure, plastic deformation occurs at the periphery of the opening 1c.

FIG. 2 shows that a bending moment is generated in the plane between the vicinity 1b of the plate-like steel material 1a and the outer peripheral portion, and the opening 1c is formed.
FIG. 4 is a view for explaining a mechanism in which plastic deformation occurs at the periphery of the element and vibration energy is absorbed.

In the vicinity of the center 1b of the plate-like steel material 1a, a bolt hole 1d for joining with another member is provided. FIG.
Although the shape of the opening 1c is rectangular, any shape such as a circle, a trapezoid, a rhombus, and a triangle may be used as long as plastic deformation easily occurs at the periphery of the opening and energy can be efficiently absorbed. The plate-shaped steel material 1a may be ordinary steel or high-tensile steel,
The yield strength of the plate-like steel material is preferably as low as possible. For example, it is preferable to use a low yield point steel having a yield strength of 200 MPa or less. In order to reduce the yield strength, (a) the chemical composition is as follows: reduction of impurity elements, addition of Ti and Nb, reduction of solute N and solute C, and (b) ferrite grain Is important. In a low yield point steel manufactured by controlling these factors with high precision, the yield strength is 70%.
The yield strength decreases to about MPa. Therefore, a steel material having a yield strength of about 70 MPa can be used. In recent years, the lineup of commercially available low yield point steel has been enhanced, and yield strength 2
Among steel materials having a low yield strength, which are aligned to about 00 MPa, a low yield point steel having a relatively high yield strength may be used. When the plate-like steel material has a high yield strength, it is desirable to increase the area ratio of the opening to increase the stress that the opening edge bears, thereby facilitating plastic deformation of this portion.

When a steel damping damper is attached to the main frame, the stiffener 1e does not cause plastic deformation at the outer periphery of the steel damping damper mounting portion or the like. Is necessary to generate This stiffener may be a steel material, and ordinary steel (TS40
0,490MPa class), high strength steel (TS570MPa, rarely 780,980MPa)
Grade), especially TMCP (Thermo-mechanical controling p.
rocess: TS490,570MPa) Steel etc. can be used.
The stiffener is joined to the plate-like steel by welding, but may be welded to one or both sides of the plate-like steel, or the edge of the plate-like steel may be welded to the steel surface of the stiffener.
In addition, stiffeners are usually welded to the entire periphery of sheet steel, but if plastic deformation does not occur at the base of the mounting part when stress such as an earthquake is applied, even if the stiffener is welded only to a part of the outer periphery Good.

FIG. 3 is a view exemplifying a portion of the steel vibration damper of the present invention attached to a main frame. FIG. 3 (a)
Is a front view, and FIG. 3B is a cross-sectional view taken along line xx shown in FIG.
FIG. In the example shown in FIGS. 3A and 3B,
Two steel dampers 1 of the present invention are arranged by high-strength bolts 3 using spacers 1g so as to sandwich the web of H-section steel. A base plate 1f (not shown) may be attached to the damping damper as shown in FIG. 3 to attach it to the main frame. However, the steel plate constituting the damping damper is directly used by another member without using the base plate. You may be tied to. Plate steel is attached to the column of H-beam by high strength bolts because of easy attachment and detachment of the damping damper.
If b does not rotate, it may be attached by welding or the like. In FIG. 3, the spacer 1g is disposed between the vibration damper of the present invention and the H-shaped steel, but the frictional force between the outer peripheral portion of the plate-shaped steel material and the H-shaped steel is appropriately reduced, and the rotation can be performed smoothly. If appropriate measures such as applying a lubricant are taken as described above, this can be omitted.

FIG. 4 is a view showing an example in which a stud 6 is arranged between an upper story beam 4 and a lower story beam 4 constituting a main frame, and steel dampers 1 of the present invention are installed at both ends thereof. is there.

FIG. 5 is a diagram showing an example in which the steel vibration damper 1 of the present invention is disposed at both ends of the beam.

FIG. 6 is a view showing an example in which the steel vibration damper 1 of the present invention is disposed at the center of the brace material.

In each of the examples shown in FIGS. 4 to 6, the vibration damper of the present invention is joined to another member by a high-strength bolt.

[0021]

The steel vibration damper of the present invention is easy to attach and detach, is inexpensive, can be compactly incorporated in the main frame, and efficiently absorbs vibration energy during an earthquake. In addition, by changing the area ratio, arrangement, shape, and the like of the opening according to the main frame and the like, any rigidity, proof stress, and the like can be obtained, and the degree of freedom in design can be secured.

[Brief description of the drawings]

FIG. 1 is a diagram illustrating a steel vibration damper of the present invention.

FIG. 2 is an explanatory view showing an operation mechanism of the steel vibration damper of the present invention.

FIG. 3 is a view illustrating a part of the steel vibration damper of the present invention attached to another member.

FIG. 4 is a diagram showing an example in which a steel vibration damper of the present invention is mounted between beams, which are main frames.

FIG. 5 is a view showing an example in which a steel vibration damper of the present invention is mounted between pillars, which are main frames.

FIG. 6 is a diagram showing an example in which the steel vibration damper of the present invention is attached as a cheek stick.

[Explanation of symbols]

 1: Damping damper of the present invention 1a: Plate-shaped steel material 1b: Near center 1c: Opening 1d: Bolt hole 1e: Stiffener 1f: Base plate 1g: Spacer 2: H beam 2a: H beam web 3: High strength bolt 4 : Beam 5: Pillar 6: Stud 7: Brace

Claims (1)

[Claims] 1. A plate-like steel material in which a stiffener made of a steel material is disposed on a part or all of an outer periphery, and a plurality of steel plates are provided along a periphery of a region having a center near a center of a plate surface of the plate-like steel material. A steel vibration damper characterized by having an opening.