KR20180095271A - Friction Damper Type Earthquake-proof Steel Frame and Earthquake-proof Method using thereof - Google Patents

Abstract

The present invention is to provide an earthquake-proof steel frame. According to the present invention, a friction damping device is installed inside the bottom edge of a rectangular steel frame so that a corner reinforcement effect can be expected in an elastic displacement section. In addition, when an external force exceeding the elastic displacement section is applied due to an earthquake, friction part deformation and determination are guided so that a lateral force concentrated on the corner is attenuated and steel frame buckling attributable to the lateral force can be effectively prevented. The present invention relates to an earthquake-proof steel frame which is installed in an opening such as a window of a steel concrete structure, including an upper frame part (110) arranged in a horizontal direction; a lower frame part (120) spaced apart from the upper frame part (110) and arranged in parallel with the lower part of the upper frame part (110); a pair of vertical frame parts (130) connecting both ends of the upper frame part (110) and the lower frame part (120); and a friction damping unit (200) mounted at each corner formed by the lower frame part (120) and the vertical frame part (130), having one side coupled to the lower part of the vertical frame part (130), having the other side coupled to the end of the lower frame part (120), and damping an external force with a frictional force in the case of displacement attributable to the external force.

Description

Technical Field [0001] The present invention relates to an earthquake-resistant steel frame having a friction damping device and a seismic resistant method using the earthquake-

The present invention relates to an earthquake-resistant steel frame which is installed in an opening such as a window of a steel-frame concrete structure. The steel-frame frame is provided with a friction damping device at a lower edge portion thereof to effectively damp earthquake energy and prevent destruction and collapse .

Since the earthquake in Gyeongju in September 2016, there has been a growing interest in earthquake-resistant seismic retrofitting, and seismic retrofitting of schools, public facilities, etc. is taking place.

In general, buildings such as schools and public facilities are provided with windows and openings for securing views and mining, thereby providing convenient and comfortable living for users.

In case of reinforced concrete buildings completed before 1989, when seismic design criteria were established, the seismic performance of the openings is weak, which can lead to great damage in the event of an earthquake. Therefore, it is necessary to reinforce the openings by various methods in order to reinforce the weakness of the openings and to minimize the loss of valuable lives and property from the earthquake. The quadrangular reinforced steel frame is used to achieve the effect of seismic reinforcement There is a way to find a way to do this.

However, when the reinforced frame is used for seismic retrofitting, the reinforcing steel frame supports all the loads. Therefore, the efficiency of the load distribution is inferior. In particular, since each corner portion of the reinforced frame has concentrated stress due to the earthquake load, Can be very low.

Therefore, a stiffener or a brace member is used to reinforce the corner portion. There is a limit in the corner portion reinforcement using the stiffener. The corner reinforcement using the brace member can expect the corner reinforcement effect. However, There is a risk of promoting collapse of reinforced concrete columns.

In other words, when reinforcing the reinforced concrete structure (a) to be reinforced by using the reinforcing steel frame (b) as shown in FIG. 1, the corner portion of the reinforcing steel frame (b) The corner reinforcement using the stiffener (c) has limitations, and the corner reinforcement using the brace member (d) has the effect of shortening the column when the earthquake occurs (the phenomenon that the column is shortened, The shear failure of the reinforced concrete column is induced, which may lead to the collapse of the existing reinforced concrete column.

In addition, there is a method of installing a damper, but the damper has a disadvantage that the performance is excellent, it is expensive, and the installation method is complicated, which may cause inconvenience of view and mining.

[Prior Art Literature]

Patent No. 10-1000206

Patent No. 10-1112577

Patent No. 10-1651849

In order to solve the above-mentioned problems, the present invention is to provide a friction damping device inside the bottom edge of a rectangular steel frame, so that an edge reinforcement effect can be expected in an elastic displacement interval, and an external force exceeding an elastic displacement interval It is an object of the present invention to provide an earthquake-resistant steel frame frame capable of inducing deformation and judgment of a frictional portion to attenuate a lateral force concentrated at an edge and effectively preventing buckling of a steel frame frame by a lateral force.

To achieve the above object, the present invention provides an earthquake-resistant steel frame frame installed at an opening formed of a column and a beam of a steel-frame concrete structure, comprising: an upper frame part 110 arranged in a horizontal direction; A lower frame part 120 spaced apart from the upper frame part 110 and arranged in parallel with the lower part of the upper frame part 110; A pair of vertical frame parts 130 connecting both ends of the upper frame part 110 and the lower frame part 120, respectively; And one side of the lower frame part 120 is coupled to a lower part of the vertical frame part 130 and the other side of the lower frame part 120 is connected to the lower frame part 120. [ And a friction damping unit 200 coupled to an end of the friction plate 200 and damping an external force due to frictional force when a displacement occurs due to an external force.

Technical effects of the configuration of the present invention are as follows.

First, when the earthquake occurs, the lateral force concentrated on the corner of the frame of the steel frame can be attenuated by the slit steel plate.

Second, it can reinforce the frame of the steel frame and prevent the crossing effect which can be caused by it, so that the risk of destruction and collapse of the column member to be reinforced can be prevented in the event of an earthquake.

Third, it is possible to easily reinforce the edge of an anti-vibration steel frame by using a friction damping device which is cheap and easy to install.

Fourth, by installing a friction damping device in a position where it can be embedded in the wall of the lower part of the window, it is possible to provide an earthquake-resistant steel frame frame that does not affect the view or mining.

1 shows a problem of a conventional seismic-strengthening steel frame.
Fig. 2 shows a concrete embodiment of the present invention, in which an upper slit steel plate 211 and a lower slit steel plate 212 are used.
Fig. 3 shows another specific embodiment of the present invention, in which upper slit-shaped steel 221 and lower slit-shaped steel 222 are used.
4 shows another specific embodiment of the present invention in which upper hinge bracket 231 and lower hinge bracket 232 are used.
Fig. 5 shows another specific embodiment of the present invention in which the upper elastic damping portion 241 and the lower elastic damping portion 242 are used.
FIG. 6 shows a state in which the construction according to the present invention is completed.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Reference will now be made in detail to the preferred embodiments of the present invention, examples of which are illustrated in the accompanying drawings.

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an earthquake-resistant steel frame installed in an opening of a window or the like of a steel-concrete structure.

2 is composed of an upper frame part 110, a lower frame part 120, a vertical frame part 130 and a friction damping part 200. [

The upper frame part 110 is arranged in the horizontal direction and the lower frame part 120 is arranged in parallel to the lower part of the upper frame part 110 so as to be spaced apart from the upper frame part 110, And vertically arranged to connect both ends of the upper frame part 110 and the lower frame part 120, respectively.

Thus, the upper frame part 110, the lower frame part 120, and the pair of vertical frame parts 130 form a rectangular steel frame, and the steel frame is installed in an opening such as a window.

The friction damping portion 200 is mounted inside each corner portion formed by the lower frame portion 120 and the vertical frame portion 130. One side of the friction damping portion 200 is welded to the lower portion of the vertical frame portion 130 And the other side of the friction damping part 200 is coupled to the end of the lower frame part 120 by welding or the like to attenuate the external force by frictional force when displacement occurs due to external force.

The friction damping portion 200 shown in FIG. 2 includes an upper slit steel plate 211, a lower slit steel plate 212, and a first binding steel plate 213.

The upper slit steel plate 211 is connected to a lower portion of each of the vertical frame portions 130 by welding or the like and the lower slit steel plate 212 is connected to the lower frame portion 120 as a triangular metal plate, And the upper slit steel plate 211 and the lower slit steel plate 212 are coupled to each other so as to be spaced apart from each other by a predetermined distance without being overlapped with each other.

The first binding steel plate 213 is bolted to the front and rear opposite sides of the separated upper slit steel plate 211 and the lower slit steel plate 212 to compress the upper slit steel plate 211 and the lower slit steel plate 212, So that the strength of the corner portion can be increased as in the case where the brace member is provided at the corner of the frame.

A plurality of slit holes 11 are provided in each of the upper slit steel plate 211 and the lower slit steel plate 212 in parallel with the longitudinal direction of the first binding steel plate 213, And the bolted connection is made with the binding steel plate 213.

When an earthquake-resistant steel frame composed of the upper frame part 110, the lower frame part 120 and the vertical frame part 130 is deformed by an external force due to an earthquake, the first binding steel sheet 213, the upper slit steel plate 211 and the lower slit steel plate 212 is allowed to move, and the seismic energy is attenuated by the frictional force according to the bolt's coupling force.

That is, when the displacement occurs in the elastic region, the external force is attenuated by the frictional force according to the bolt's coupling force. By absorbing the external force efficiently through the frictional force,

When the external force due to the earthquake is increased and deviates from the elastic deformation region, the slit hole 11 of the upper slit steel plate 211 and the lower slit steel plate 212 and the bolt passing hole portion of the first binding steel plate 213 are broken and deformed , The earthquake energy is absorbed and attenuated to effectively block the breakage and collapse of openings of windows, etc. of the reinforced concrete structure.

The first slat steel plate 211 and the first slat steel plate 212 are coupled to the first slat steel plate 211 and the lower slit steel plate 212 at right angles to each other along the upper ends of the upper slit steel plate 211 and the lower slit steel plate 212, This first buckling prevention flange 214 reinforces the upper slit steel plate 211 and the lower slit steel plate 212 to prevent buckling or deformation from occurring easily so that the abrupt decrease of the seismic energy attenuation function according to the frictional force .

3, an H-shaped steel is used as the friction damping portion 200 of another specific embodiment of the present invention.

The upper slit-shaped steel 221 is an H-shaped steel member. One end of the upper slit-shaped steel 221 is joined to the lower part of each of the vertical frame parts 130 by welding or the like, and is inclined downward toward the lower frame part 120 The lower slit-shaped steel member 222 is an H-shaped steel member. One end of the lower slit-shaped steel member 222 is joined to each of both side ends of the lower frame member 120 by welding or the like, 221).

The second binding steel sheet 223 is bolted to be overlapped with both the front and rear sides of the web of the upper slit-shaped steel 221 and the web of the lower slit-shaped steel 222 to press the upper slit-shaped steel 221 and the lower slit- And connects the upper slit-shaped steel 221 and the lower slit-shaped steel 222 together.

A plurality of slit holes 11 are provided in each of the webs of the upper slit-shaped steel 221 and the lower slit-shaped steel 222 in parallel to the longitudinal direction of the second binding steel sheet 223, The second binding steel sheet 223 is bolted.

The principle of damping earthquake energy by friction force due to bolt coupling is the same when an external force due to earthquake is applied.

3, the upper stiffening plate 224 may include a lower stiffening plate 225 and a second anti-buckling flange 226. The upper stiffening plate 224 may be a triangular plate- And the lower reinforcing plate 225 is formed as a triangular plate member having two sides formed with the lower slit-shaped steel member 222 and the upper slit- And the lower frame part 120 to increase the coupling force between the lower slit-shaped steel pipe 222 and the lower frame part 120. [

The second buckling prevention flange 226 is welded to the upper reinforcing plate 224 and the lower reinforcing plate 225 so as to be orthogonal to each other along the other side of each of the upper reinforcing plate 224 and the lower reinforcing plate 225, Thereby increasing the strength of the lower reinforcing plate 224 and the lower reinforcing plate 225 and preventing buckling or deformation from easily occurring.

Fig. 4 shows another embodiment of the friction damping unit 200, in which a hinge type is used.

The upper hinge bracket 231 is coupled to a lower portion of each of the vertical frame portions 130 by welding or the like and the lower hinge bracket 232 is bolted to both ends of the lower frame portion 120.

The hinge-shaped load transmission member 233 is bolted to both the upper hinge bracket 231 and the lower hinge bracket 232, as shown in FIG. 4. When an external force exceeding the bolt coupling force is applied, The upper hinge bracket 231, and the lower hinge bracket 232 rotate relative to each other.

A slit hole 11 is formed in a longitudinal direction of the lower frame part 120 in the lower frame part 120 coupled to the lower hinge bracket 232 and a lower hinge bracket 232 is provided in the slit hole 11 To the lower frame part 120 through bolts.

Each of the lower hinge brackets 232 may be provided with a third binding steel plate 234 which is in contact with the lower frame 120. The lower binding frame 120 at a position corresponding to the third binding steel plate 234, A slit reinforcing plate 235 is provided under the slit hole 11 of the lower hinge bracket 232 and is coupled with the third binding steel plate 234 of the lower hinge bracket 232 by the coupling bolt, ) Region may be pressed against the upper and lower portions.

4, the relative rotation of the hinge-shaped load transmission member 233, the upper hinge bracket 231, and the lower hinge bracket 232 in the elastic deformation region, when the external force due to the earthquake acts, The seismic energy is attenuated by the frictional force of the bolts in the process of the occurrence of the seismic energy. In addition, in the process of relative movement along the lower hinge bracket 232, the lower frame part 120, and the slit hole 11, The seismic energy is absorbed more efficiently by the friction force.

When the external force due to the earthquake is increased and deviates from the elastic deformation area, the hinge-shaped load transmission member 233, the upper hinge bracket 231, and the lower hinge bracket 232 are engaged with the bolt- The breakage and deformation of the bolt-coupled slit hole 11 of the part 120 can be absorbed and damped by the seismic energy, effectively blocking the breakage and collapse of the openings of the window of the reinforced concrete structure.

Fig. 5 shows another embodiment of the friction damping portion 200, in which a highly damped rubber layer or viscoelastic layer 245 is used.

The upper elastic damping portion 241 is bolted to the lower portion of each of the vertical frame portions 130 and the lower elastic damping portion 242 is bolted to both end portions of the lower frame portion 120.

Each of the upper elastic damping portion 241 and the lower elastic damping portion 242 is formed so as to have a predetermined thickness between the base plates 244 facing each other, A rubber layer or a viscoelastic layer 245. Such a highly damped rubber layer or viscoelastic layer 245 can be selected from a wide variety of commercially available materials and products.

The elastic damping type load transmission member 243 is coupled to both the upper elastic damping portion 241 and the lower elastic damping portion 242 at both ends thereof.

The upper elastic damping portion 241 and the lower elastic damping portion 242 including the highly damping rubber layer or the viscoelastic layer 245 absorb and absorb the seismic energy by repeating the elastic behavior by the elastic force of itself when an external force due to the earthquake acts When an external force exceeding the range of the elastic force is applied, the high-damping rubber layer or the viscoelastic layer 245 is broken and absorbs the external force.

Fig. 6 shows a state in which the seismic proofing method using the earthquake-resistant steel frame of the present invention is completed.

(1) Step 1

The process of demolishing the existing window or the finishing material at the site where the earthquake-proof steel frame frame is to be installed may be accompanied by the demolition of the window wall at the lower portion of the window as necessary.

(2) Step 2

It is a process to prepare a space where the frame of steel frame is installed by removing irregular projections, paint or foreign matter on the base surface from which existing window or finishing material is removed by using a grinder.

(3) Step 3

A pre-fabricated earthquake-resistant steel frame is transported to the ground surface to temporarily install it. The earthquake-resistant steel frame is moved to the installation space using a crane at the work site. Attach the steel frame to the openings. If necessary, the front and back of the frame can be supported using appropriate supporters.

(4) Step 4

This is the process of drilling anchor holes on the base surface and installing anchor bolts according to the patterns of the anchor mounting holes formed in the frame.

In other words, holes are formed in the upper frame part 110, the lower frame part 120, and the vertical frame part 130, respectively, for mounting the anchor bolts, when the steel frame is manufactured at the factory, In the installed state, the anchor holes are drilled on the surface according to the pattern of these holes.

Once the drilling is completed, remove dust and foreign matter from inside and around the anchor hole once again, then install the anchor bolt. The types of anchor bolts are freely selectable among commercialized products as needed and are not limited to products having a specific structure. In addition, since the general procedure according to the selected anchor bolts can be performed in the installation of the anchor bolts, detailed description thereof will be omitted.

(5) Step 5

This is the process of sealing the boundary between the frame of steel frame and the ground plane along the perimeter of the frame.

In other words, the gap between the boundary between the upper frame portion 110, the lower frame portion 120 and the vertical frame portion 130 constituting the earthquake-resistant steel frame and the base surface and the peripheral portion gap provided with the anchor bolt are sealed. Can choose the right one among various products that are currently commercialized.

(6) Step 6

In the fifth step, synthetic resin adhesive or grout-type mortar is injected into the sealed space to fill the space, and the injection port and the air discharge port are spaced apart from each other so as not to generate a gap in the inner space. Such a synthetic resin adhesive is not limited to a specific product, and an appropriate product can be freely selected among commercially available products.

(7) Step 7

The process of completing construction after finishing work may include the process of removing extra synthetic resin adhesive or grout mortar, arranging the work area around, and finishing necessary work on the surface of the column.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is clearly understood that the same is by way of illustration and example only and is not to be taken by way of limitation, Addition or deletion of a technique, and limitation of a numerical value are included in the protection scope of the present invention.

110: upper frame part
120: Lower frame part
130: Vertical frame part
200: Friction damping portion
211: Upper slit steel plate
212: Lower slit steel plate
213: first binding steel sheet
214: first anti-buckling flange
221: Upper slit steel
222: Lower slit-shaped steel
223: second binding steel sheet
224: Upper stiffening plate
225: Lower reinforcement plate
226: second anti-buckling flange
231: upper hinge bracket
232: Lower hinge bracket
233: Hinge type load transmitting member
234: third binding steel sheet
235: slit reinforcing plate
241: upper elastic damping portion
242: lower elastic damping portion
243: elastic damping type load transmitting member
244: base plate
245: a highly damped rubber layer or viscoelastic layer
11: Slit hole

Claims (8)

The present invention relates to an earthquake-resistant steel frame frame installed in an opening, such as a window of a steel frame structure,
An upper frame part 110 arranged in a horizontal direction;
A lower frame part 120 spaced apart from the upper frame part 110 and arranged in parallel with the lower part of the upper frame part 110;
A pair of vertical frame parts 130 connecting both ends of the upper frame part 110 and the lower frame part 120, respectively; And
The lower frame part 120 and the vertical frame part 130 are mounted on the respective corners of the lower frame part 120 and the lower frame part 130. One side is coupled to the lower part of the vertical frame part 130, A friction damping part coupled to the friction damping part and damping an external force by frictional force when an external force is generated;
And a friction damping device for supporting the friction damping device. The method of claim 1,
The friction damping part (200)
An upper slit steel plate 211 coupled to a lower portion of each of the vertical frame parts 130;
A lower slit steel plate 212 coupled to both side ends of the lower frame part 120; And
A first binding steel plate 213 bolted to both front and back sides of the upper slit steel plate 211 and the lower slit steel plate 212 to press the upper slit steel plate 211 and the lower slit steel plate 212, ;
, ≪ / RTI >
A plurality of slit holes 11 are formed in each of the upper slit steel plate 211 and the lower slit steel plate 212 in parallel with the longitudinal direction of the first binding steel sheet 213, A bolt connection is made with the first binding steel plate 213,
A first buckling prevention flange 214 coupled to each of the upper slit steel plate 211 and the lower slit steel plate 212 along the upper ends of the upper slit steel plate 211 and the lower slit steel plate 212 respectively;
Wherein the frame is provided with a friction damping device. The method of claim 1,
The friction damping part (200)
An upper slit-shaped steel 221 as an H-shaped steel member having one end connected to a lower portion of each of the vertical frame portions 130 and sloping downward toward the lower frame portion 120;
A lower slit-shaped steel pipe 222 as an H-shaped steel member having one end connected to both ends of the lower frame part 120 to form the upward sloping shape and the upper slit-shaped steel pipe 221 arranged in a straight line; And
And a second binding unit 221 which is bolted to be overlapped with both the front and rear sides of the web of the upper slit-shaped steel 221 and the front and rear sides of the web of the lower slit-shaped steel 222 to press the upper slit-shaped steel 221 and the lower slit- A steel plate 223;
, ≪ / RTI >
A plurality of slit holes 11 are formed in the web of the upper slit shaped steel 221 and the web of the lower slit shaped steel 222 in parallel to the longitudinal direction of the second bonded steel plate 223, 11. The frame as claimed in claim 1, wherein the second connecting steel plate (223) is bolted to the second connecting steel plate (223). 4. The method of claim 3,
An upper reinforcing plate 224 having two sides connected to the upper slit-shaped steel 221 and the vertical frame 130, respectively, as a triangular plate member;
A lower reinforcing plate 225 having two sides connected to the lower slit-shaped steel pipe 222 and the lower frame portion 120, respectively, as a triangular plate-shaped member; And
A second buckling prevention flange 226 coupled to the upper reinforcing plate 224 and the lower reinforcing plate 225 so as to be orthogonal to each other along the other side of each of the upper and lower reinforcing plates 224 and 225;
Further comprising a friction damping device. The method of claim 1,
The friction damping part (200)
An upper hinge bracket 231 coupled to a lower portion of each of the vertical frame parts 130;
A lower hinge bracket 232 coupled to both ends of the lower frame part 120; And
A hinge type load transmission member 233 to which both end portions are bolted to the upper hinge bracket 231 and the lower hinge bracket 232, respectively;
, ≪ / RTI &
The lower frame part 120 coupled to the lower hinge bracket 232 is provided with a slit hole 11 along the longitudinal direction of the lower frame part 120. The lower hinge bracket 232 is inserted into the slit hole Is coupled to the lower frame part (120) through a bolt (11). The method of claim 5,
Each of the lower hinge brackets 232 includes a third binding steel plate 234 contacting the lower frame portion 120;
Respectively,
The third binding steel sheet 234 is positioned below the slit hole 11 of the lower frame part 120 at a position corresponding to the third binding steel sheet 234 and is fixed to the third binding steel sheet 234 of the lower hinge bracket 232 A slit reinforcing plate 235 coupled to the lower frame part 120 to press the slit hole 11 at upper and lower portions thereof;
Wherein the frame further comprises a friction damping device. The method of claim 1,
The friction damping part (200)
An upper elastic damping portion 241 coupled to a lower portion of each of the vertical frame portions 130;
A lower elastic damping portion 242 coupled to both ends of the lower frame portion 120; And
An elastic damping type load transmission member 243 having both side ends joined to the upper elastic damping portion 241 and the lower elastic damping portion 242;
, ≪ / RTI &
The upper elastic damping part 241 and the lower elastic damping part 242, respectively,
And a highly damped rubber layer or a viscoelastic layer (245) formed to have a predetermined thickness between the base plates (244) facing each other and connecting the base plate (244) facing each other. Earthquake-resistant steel frame. An earthquake-proof method using an earthquake-resistant steel frame equipped with the friction damping device according to any one of claims 1 to 7,
A first step of removing an existing window or a finishing material at a site where the earthquake-resistant steel frame is to be installed;
A second step of removing protrusions, paint, and foreign matter from the base surface from which the existing window or finishing material has been removed using a grinder;
A third step of installing a prefabricated earthquake-resistant steel frame on a ground surface of the ground;
A fourth step of drilling an anchor hole on a base surface according to a pattern of an anchor mounting hole formed in the earthquake-resistant steel frame, and installing an anchor bolt;
A fifth step of sealing the boundary between the frame of the steel frame and the floor surface along the periphery of the frame;
A sixth step of injecting a synthetic resin adhesive or grout-type mortar into the sealed inner space and filling it; And
A seventh step of completing the construction after the finishing process;
Wherein the friction damping device is provided with an anti-resonance steel frame.

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