JP2000145193A - Vibration damper for reinforced-concrete structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a vibration damper for a reinforced-concrete structure, by which habitability is improved maximally by installing an excess space on plane arrangement can be installed without occupation while largely reducing rolling by a strong wind, an earthquake or the like when the vibration damper is mounted on a high-rise building structure in the Metropolitan area, in which sites are insufficient. SOLUTION: In the vibration damper for the reinforced-concrete structure 1 with rigid frames 7 composed of reinforced concrete poles 3 and beam materials 5 unified and connected to the concrete 3a of the reinforced-concrete poles 3, the steel frames 3b of the reinforced-concrete poles 3 and concrete 3a in the periphery of the steel frames 3b are made independent mutually along the axial direction and insulated in a mutually displaceable manner by insulating materials 3c interposed among the boundary surfaces of these substances while damping means damping relative displacement in the axial direction generated among the insulated steel frames 3b and concrete 3a due to the bending deflection of the frames are mounted among these steel frames 3b and concrete 3a.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vibration damping device for a structure having a rigid frame composed of steel concrete columns and beams, and more particularly to a vibration damping device for attenuating horizontal vibration caused by bending deformation of the structure. It relates to a vibration device.

[0002]

2. Description of the Related Art From the experience of the Great Hanshin-Awaji Earthquake, the importance of seismic performance for high-rise building structures has been re-recognized. Vibration suppression methods and devices for reducing the rolling of high-rise floors are being actively developed.

As a vibration control method, there is a method of indirectly controlling a vertical displacement accompanying the horizontal displacement. This method is mainly applied to a high-rise building, and the principle of a method of damping by vertical displacement will be described with reference to FIG.

FIG. 6 is a schematic view of a building structure 1 composed of a structural frame 7 composed of columns 3 and a plurality of beams 5, and FIG. 6 (a) shows that the structural frame 7 undergoes bending deformation. FIG. 6B shows a state in which a shear deformation has occurred.

[0005] Generally, the total horizontal displacement γ of the building structure 1 that rolls is the horizontal component γB of the bending deformation of the frame 7.
And the horizontal displacement component γs of the shear deformation. Here, as for the total horizontal displacement of the building structure 1, as the height becomes higher with respect to the lateral width of the building structure 1, the horizontal displacement component caused by the bending deformation of the entire frame 7 becomes more dominant. Therefore, in the case of a high-rise building, the total horizontal displacement γ can be approximated by the horizontal component γB of the bending deformation.
As shown in (a), when a horizontal displacement γB of bending deformation occurs in the frame 7 of the building structure 1, the bending angle θ is generated by the amount corresponding to the bending angle θ, and the vertical direction is applied to both ends of the frame with respect to the bending center. There is a unique relationship that displacement δ occurs.
For example, in a model calculation of the building structure 1 having a height of about 200 m, a horizontal displacement γB of about 100 cm occurs due to a normally assumed wind or earthquake, and a vertical displacement δ becomes about 4
cm, which is a sufficiently controllable displacement. That is, by suppressing the vertical displacement δ, it is possible to suppress the roll.

As a vibration damping device that attenuates vibration caused by bending deformation by utilizing this fact, a tension member is attached side by side from an upper layer to a lower layer on the side of a bending column of a building structure. A pre-stress is introduced by installing a vibration control device in
2. Description of the Related Art A damping device for a structure in which a displacement of a tensile member in a vertical direction is damped by a damping device to dampen horizontal vibration of the structure is known (see Japanese Patent Application Laid-Open No. 7-34718). ).

[0007] Further, an inner steel pipe continuous in the height direction of the building structure is provided along the pillar of the building structure inside the outer steel pipe constituting the outer pillar of the building structure, and the uppermost part of the inner steel pipe is provided. A high-damping device for controlling the deformation in the column axis direction in which a lowermost portion is connected to an upper portion and a lower portion of a building structure, respectively, and a damping device is interposed in the middle or at the end of the inner steel pipe (Japanese Patent Laid-Open Publication No. Hei.
No. 231028) has also been proposed.

[0008]

However, in the former damping device for a structure, it is necessary to secure a space for attaching a tension member to be attached from the upper layer to the lower layer on the side of the pillar. There is a drawback in the space efficiency of the layout plan and there is room for improvement.

Further, the latter high damping device for controlling the deformation in the axial direction of the column can be applied only to a steel structure (hereinafter abbreviated as S-structure), and has a problem that it is difficult to apply to a steel concrete structure excellent in compressive load resistance. .

The present invention has been made in view of the above-mentioned problems, and can be installed without occupying an extra space in a plane arrangement. It is an object of the present invention to provide a vibration damping device for a steel concrete structure capable of improving as much as possible.

[0011]

Means for Solving the Problems As means for solving the above problems, of the present invention, the invention according to claim 1 is integrated with a steel concrete column and concrete of the steel concrete column. A damping device for a steel-framed concrete structure provided with a ramen frame composed of a beam material and a steel frame of the steel-framed concrete column and surrounding concrete, wherein an insulating material interposed between these boundary surfaces Is insulated so as to be relatively displaceable independently of each other along the axial direction, and between the steel frame and the concrete, between the insulated steel frame and the concrete due to the bending deformation of the frame. It is characterized in that damping means for damping the relative displacement in the axial direction is provided.

[0012] According to the above structure, when the structure is rolled with bending deformation due to an earthquake, wind, or the like, the steel frame is provided on the structure frame on one side of the bending center axis. Compressive force acts on the steel concrete column on the other side, and tensile force acts on the other side of the column through the beam. At this time, the beam is integrally joined to the concrete of the steel concrete column, and the steel frame and the concrete are insulated by the insulating material so as to be relatively displaceable along the column axis direction. Works only on concrete, not on steel. For this reason, the concrete of the steel concrete column expands and contracts in the column axis direction due to the bending deformation of the structural frame, but the steel frame does not expand and contract, and a relative displacement occurs along the column axis direction between the concrete and the steel frame.
Then, the relative displacement is transmitted to the damping means, and the relative displacement vibration is damped by the operation of the damping means, so that the lateral sway of the structural frame is damped. Also, the damping means can be arranged in the plane space of the steel concrete column, and the vibration damping device does not occupy the plane arrangement space, and the space efficiency in the plan arrangement plan of the structure is impaired. Absent.

[0013] The invention according to claim 2 is characterized in that the damping means is an attenuator provided at the upper end of the steel frame concrete column and connected to the steel frame and concrete.

According to the above structure, the steel frame and the concrete are connected to the upper end of the steel frame concrete column in which the relative displacement difference between the steel frame and the concrete is maximized, and an attenuator such as an oil damper, an air damper or a friction damper is provided. Is provided, the deformation difference absorbed by the attenuator can be maximized, a large vibration damping effect can be obtained, and the attenuator can be installed in the plane space of the steel concrete column, and the plan layout plan of the structure There is no loss of space efficiency.

The invention according to claim 3 is characterized in that the insulating material is a viscoelastic material or a viscous material interposed between the steel frame and concrete and also functioning as the damping means.

According to the above configuration, when the concrete and the steel frame are relatively displaced in the column axis direction, shear deformation occurs in the viscoelastic material or the viscous material of the insulating material interposed between them.
The work due to the shearing force absorbs the vibration energy of the roll, and the insulating material functions as a damping means, so that a large vibration damping effect can be obtained. In addition, since the damping means is also used as an insulating material and is provided inside the steel concrete column main body, there is no need to secure an extra arrangement space larger than the plane sectional area of the steel concrete column, and the space efficiency is not impaired. .

Further, by using the damper in combination with the damper provided on the upper end of the steel concrete column, a further damping effect can be obtained, and the vibration damping property can be improved as much as possible.

[0018]

Preferred embodiments of the present invention will be described below in detail with reference to the accompanying drawings.

FIG. 1 shows a first embodiment of a vibration damping device for a steel-frame concrete structure according to the present invention, and is a cross-sectional view of a high-rise building structure at a column center position. This building structure 1
Is provided with a ramen frame 7 composed of an outer peripheral portion, a large number of steel concrete columns 3 arranged at the four corners thereof, and a plurality of beams 5 provided between the layers of each floor by connecting these columns 3.

FIG. 2 is a sectional view of the steel concrete column 3 taken along the line II-II shown in FIG. 1. In the present embodiment, the steel concrete column 3 has a cross-shaped steel frame 3b and an outer periphery of the steel frame 3b. Is formed in a rectangular shape with the concrete 3a surrounding. Here, the steel frame 3b and the concrete 3a of the steel frame concrete column 3 are insulated by the insulating material 3c interposed therebetween, and are provided so as to be relatively displaceable along the column axis direction. Basic slab 1
5 is fixed. In addition, the cross-sectional shape of the steel frame 3b is not limited to the illustrated cross shape, but may be an I shape, an H shape, or the like. Although not shown, each beam 5 is rigidly and integrally connected to the steel concrete column 3 only to the concrete 3a side thereof to form a rigid frame 7, and the beam 5 is made of H-shaped steel or the like. It may be made of steel or reinforced concrete.

In this embodiment, a viscoelastic material or a viscous material is used for the insulating material 3c, and the insulating material 3c is a damping means provided between the steel frame 3b and the concrete 3a. It is also used as That is, the relative displacement along the column axis direction generated between the concrete 3a and the steel frame 3b is absorbed by the shear deformation of the insulating material 3c made of the viscoelastic material or the viscous material. Accordingly, a polymer material which is a material having viscoelastic deformation or viscous deformation characteristics is suitable for the insulating material 3c, but shear deformation occurs when a relative displacement between the steel frame 3b and the concrete 3a occurs,
The material is not limited to this as long as it is a material that can absorb energy by the work due to the shearing force, and an elastic-plastic material such as high-damping rubber, or a spreadable metal such as lead or a synthetic resin is also applicable.

Here, the vibration damping action of the present invention will be described with reference to FIG. FIG. 3 is a cross-sectional view of the building structure having the vibration damping device according to the present invention, showing a state in which the building has rolled with bending deformation, and is at the center of the pillar.

As described above, the frame 7 of the high-rise building structure 1 has a unique relation between the horizontal displacement γ and the vertical displacement δ, but the building structure 1 rolls,
When the clockwise bending deformation occurs in the figure,
The concrete 3a 'of the left column 3' extends in the column axis direction symmetrically with respect to the bending deformation center axis CL (in the illustrated example, the center line in the width direction of the structure 1), and the concrete 3a of the right column 3 extends. However, since the steel frames 3b 'and 3b buried inside the columns 3' and 3 do not expand and contract, the steel frames 3b 'and 3b and the concrete 3a' and 3a extend along the column axis. Relative displacement occurs, and the relative displacement is transmitted to the insulating members 3c 'and 3c interposed between the steel frames 3b' and 3b and the concrete members 3a 'and 3a.
The viscoelastic material or viscous material used for c ′ · 3c is sheared. Then, the work by the shearing force at the time of deformation of the insulating materials 3c 'and 3c absorbs the displacement energy due to the vibration, and thus the bending vibration is suppressed to a small extent, so that the high-rise building structure 1 can have a large vibration damping effect. That is, the viscoelastic material or viscous material of the insulating materials 3c 'and 3c also functions as the damping means.

In addition, since the structure is such that the vibration damping device is provided inside the steel frame concrete pillars 3 'and 3', no space is required on the plane of the vibration damping device. Applicable to various buildings.

Further, since the vibration damping device of the present invention can change the vibration damping capacity and specification by changing the material of the insulating material inside the column and changing the shape of the steel frame, the vibration damping effect can be improved in a planar arrangement. Not only can be preferentially arranged at a position where the vibration is large, but also by individually disposing a plurality of columns having different damping abilities, it is possible to improve the damping effect in a combined manner.

On the other hand, regarding the buckling resistance of the steel frame 3b, the surrounding concrete 3a receives the horizontal displacement during the action of the axial compression force of the steel frame 3b via the insulating material 3c. At the same time, it is possible to effectively resist, and at the same time, it may be possible to apply a shape in which the second moment of area of the steel frame 3b is increased.

An example of a method of installing the insulating material 3c will be described. An insulating material 3c formed of a polymer material in a sheet shape is adhered to the entire outer periphery of the steel frame 3b by a tape, an adhesive, or welding. Then, a formwork for concrete injection molding is assembled around the steel frame 3b, and ready-mixed concrete is poured into the formwork. Then, after the ready-mixed concrete is hardened, if the form is removed, a desired steel-concrete column 3 in which the steel frame 3b and the concrete 3a are insulated by the insulating material 3c is obtained. It is to be noted that the surface of the sheet-shaped insulating material 3c in contact with the concrete 3a is provided with uneven protrusions, or measures for improving the adhesiveness to the concrete, such as roughening the surface roughness or applying an adhesive, are taken. Of course. As described above, the workability of the present invention at the construction site is very easy as in the case of the conventional steel concrete columns.

With regard to maintenance, it is conceivable that the insulating material 3c is renewed over time. Basically, a highly durable material is selected for the insulating material, but the deterioration is periodically renewed by the following method. It is possible to That is,
A sol-like or gel-like viscous material is used as the insulating material 3c. When the deterioration is renewed, a pump or the like is used from a drain pipe with an open / close valve for replacing the insulating material 3c installed at the lower end of the steel-framed concrete column 3. Remove the viscous material and replace it with a new viscous material.

FIGS. 4 and 5 show an attenuator as an attenuating means.
It shows a second embodiment of a vibration damping device for a steel concrete structure according to the present invention when an oil damper is applied,
It is sectional drawing in the pillar center position of the building structure 1. FIG. FIG. 4 shows a normal state without rolling, and FIG. 1 of the first embodiment is shown.
It corresponds to. FIG. 5 shows a state in which rolling occurs with bending deformation, and corresponds to FIG. 3 of the first embodiment. Here, the structure of the building structure 1 itself is completely the same as that of the first embodiment, and the same members are denoted by the same reference numerals and description thereof will be omitted.

As shown, in the second embodiment, oil dampers 27 and 27 'as dampers are arranged at the upper end portions of the steel concrete columns 3 and 3' of the building structure 1. The oil dampers 27, 27 ′ are slidably fitted in the cylinders 19, 19 ′ and slidably fit in the cylinders 19, 19 ′.
1b and 21b 'are formed at the lower ends of the cylinders 19 and 19', and the lower ends of the cylinders 19 and 19 'are integrally formed with mounting flanges 29 and 29'. On the upper surface of concrete 3a, 3a 'at the top of concrete column 3, 3'
Fixed at 23 '. Also, pistons 17 and 17 '
Actuating rods 17a, 17a 'formed integrally with each other extend downward through the lower ends of the cylinders 19, 19', and have distal ends whose ends are steel frames 3b, 3 embedded in concrete 3a, 3a '.
It is connected to the upper end of b 'by pins 16 and 16'. The pistons 17 and 17 'are provided with orifices 25 and 25' for communicating the oil-filled hydraulic chambers 21a and 21a 'and 21b and 21b'. In the second embodiment, it is not always necessary to use a viscoelastic body or a viscous material for the insulating members 3c and 3c ', so that the concrete 3a and 3a' and the steel frames 3b and 3b 'can be relatively displaced. It only needs to be insulated.

In the present embodiment, an oil damper 27 is provided at the upper end of the steel-concrete column 3, 3 'where the axial relative displacement between the steel frame 3b, 3b' and the concrete 3a, 3a 'is maximized.
-Since 27 'is installed, the deformation difference absorbed by the oil damper can be maximized, and a large vibration damping effect can be obtained.

According to the second embodiment of the above configuration, as shown in FIG. 5, when the building structure 1 rolls and a clockwise bending deformation occurs, the center of the building structure 1 in the width direction is generated. The concrete 3a 'of the left column 3' elongates and the concrete 3a of the right column 3 shortens on the basis of the bending center axis CL of the wire, but the steel frames 3b 'and 3b inserted therein.
Does not expand or contract, the piston 17 'of the left oil damper 27' receives a load downward and the right piston 17 receives a load upward. At this time, regarding the left oil damper 27 ', the oil in the hydraulic chamber 21a'
After passing through 5 ′, it flows into the hydraulic chamber 21b ′. The flow resistance at this time brings about a damping effect of the vibration, and produces a damping effect.

When it is desired to further improve the vibration damping effect, a viscoelastic material may be used for the insulating material 3c as in the first embodiment.
A viscous material may be used. Thus, in addition to the vibration damping effect of the oil damper, the vibration damping effect due to the absorption of vibration energy due to the shearing deformation of the insulating material 3c is further added. In the second embodiment, the oil damper 27 is used as an attenuator. However, the present invention is not limited to this, and an air damper and a friction damper having the same effect can be applied.

The cross-sectional shape of the steel frame 3b of the steel concrete column 3 having the vibration damping structure described above is not limited to the above-described cross shape, but may be an I-shape, an H-shape, an L-shape, a square or round steel pipe, a prism, or the like. A round bar or the like may be used, and it is necessary to consider and determine which one to apply in consideration of the assumed buckling load and the required vibration damping force at the time of design. That is, if buckling resistance is required,
A sectional shape that increases the next moment may be applied, and a shape that increases the surface area of the steel frame may be applied if vibration resistance is required. Further, the steel concrete column 3 is a steel reinforced concrete (hereinafter abbreviated as SRC) column in which a reinforcing bar is embedded in concrete 3a for reinforcement, or a steel concrete (hereinafter referred to as SC) in which a steel frame is separately inserted in the concrete 3a for reinforcement. Abbreviations) Pillars or steel tube concrete (hereinafter abbreviated as CFT) columns in which steel tube columns are wrapped around the periphery of concrete 3a, or CFT columns which are the above-mentioned CFT columns and have reinforcing bars or steel frames embedded in concrete 3a for reinforcement. However, when it is actually applied to a high-rise building, SRC columns and CFT columns are considered to be appropriate in order to secure the strength during tensile deformation of the columns. In addition, when CFT is used, the problem of wave deformation particularly in the vicinity of the beam-column joint is a problem, but it can be dealt with by integrating the steel pipe and concrete with a stud or the like.

With respect to the position of the steel concrete column 3 to which the present invention is applied on the plane, in each of the above-described embodiments, the steel column is installed at the four corners and the outer column at the outer periphery. The column is not limited to this as long as the difference between the amount of concrete axial deformation of the concrete column and the amount of axial deformation of the steel frame increases, and if the column has a large damping effect, it is not limited to this. May be applied.

[0036]

As described above, the invention according to claim 1 is provided with a ramen frame composed of a steel concrete column and a beam integrated with and joined to the concrete of the steel concrete column. A vibration damping device for a steel concrete structure, wherein a steel frame of the steel concrete column and surrounding concrete can be relatively displaced independently from each other along an axial direction by an insulating material interposed between these boundary surfaces. And damping means for damping the axial relative displacement between the insulated steel frame and the concrete due to bending deformation of the frame between the steel frame and the concrete. It was made.

Accordingly, when the relative displacement occurs due to the lateral sway of the frame, the relative displacement vibration is absorbed by the damping means, and the vibration damping effect can be obtained.

Further, the damping means can be arranged in the plane space of the steel concrete column, so that the vibration damping device does not occupy the plane arrangement space, and the space efficiency in the plan arrangement plan of the structure is impaired. Never be. Therefore, it is possible to alleviate the restrictions on the plan of the plan of the layout due to the difficulty in securing the building land.

Further, the column of the present invention is a steel concrete structure having excellent compressive load resistance, so that it can be applied to various buildings, and the vibration control capability and specifications can be changed for each column, so that the columns are arranged in a plane. Not only can it be preferentially arranged at a position where the upper damping effect is large, but by arranging a plurality of pillars having different individual damping abilities, the damping effect can be improved compositely.

According to a second aspect of the present invention, as the damping means of the first aspect, the steel frame and the concrete are connected to the upper end of a steel concrete column in which the relative displacement difference between the steel frame and the concrete is maximized. Since the attenuator is provided, the deformation difference absorbed by the attenuator can be maximized, and a large damping effect can be obtained. Does not impair.

According to a third aspect of the present invention, a viscoelastic material or a viscous material which also functions as a damping means is applied as an insulating material interposed between the steel frame and the concrete. Therefore, when the concrete and the steel frame are relatively displaced in the column axis direction, shear deformation occurs in the viscoelastic material or the viscous material of the insulating material interposed therebetween, and the work caused by the shear force causes the vibration of the roll. Energy is absorbed, and a great damping effect can be obtained. Further, since the vibration damping device is installed inside the steel concrete column, there is no need to secure an extra space for installing the vibration damping device, and the space efficiency is not impaired not only in the plane but also in the height direction.

Further, when used in combination with the attenuator according to the second aspect, the damping effect is synergistic, and a remarkable damping effect is achieved.

[Brief description of the drawings]

FIG. 1 is a sectional view of a high-rise building structure at a column center position, showing a first embodiment of a vibration damping device according to the present invention.

FIG. 2 is a cross-sectional view of the steel concrete column taken along the line II-II shown in FIG.

FIG. 3 is a cross-sectional view at a column center position showing a state in which the building structure of FIG. 1 has rolled due to bending deformation.

FIG. 4 is a cross-sectional view of a high-rise building structure showing a second embodiment of a vibration damping device according to the present invention at a column center position.

5 is a cross-sectional view at the center of a pillar showing a state in which the building of FIG. 4 has rolled due to bending deformation.

6A and 6B are diagrams of a structure constituted by a frame including columns and beams of a plurality of layers, wherein FIG. 6A is a conceptual diagram showing a state in which bending deformation has occurred, and FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Steel-concrete building structure 3a Concrete 3b Cross-shaped steel frame 3c Insulation material 3 Steel-concrete column 5 Beam 7 Rigid frame structure consisting of beam-column 15 Foundation slab

Claims (3)

[Claims] 1. A vibration damping device for a steel-frame concrete structure having a rigid frame composed of a steel-frame concrete column and a beam integrated with and joined to the concrete of the steel-frame concrete column, The steel frame of the column and the surrounding concrete are insulated so as to be relatively displaceable independently of each other along the axial direction by the insulating material interposed between these boundary surfaces, and between the steel frame and the concrete. A damping means for damping the axial relative displacement generated between the insulated steel frame and the concrete due to the bending deformation of the frame, wherein the damping means is provided. . 2. The vibration damping system for a steel concrete structure according to claim 1, wherein said damping means is an attenuator provided at the upper end of said steel frame concrete column and connected to said steel frame and concrete. apparatus. 3. The material according to claim 1, wherein the insulating material is a viscoelastic material or a viscous material interposed between the steel frame and the concrete and functioning as the damping means. Structure vibration control device.