KR101379892B1 - Seismic retrofit of building structures using changeable steel-frame and construction method thereof - Google Patents

Seismic retrofit of building structures using changeable steel-frame and construction method thereof Download PDF

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Publication number
KR101379892B1
KR101379892B1 KR1020130102526A KR20130102526A KR101379892B1 KR 101379892 B1 KR101379892 B1 KR 101379892B1 KR 1020130102526 A KR1020130102526 A KR 1020130102526A KR 20130102526 A KR20130102526 A KR 20130102526A KR 101379892 B1 KR101379892 B1 KR 101379892B1
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South Korea
Prior art keywords
frame
corner
opening
length
seismic
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KR1020130102526A
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Korean (ko)
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황대성
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비코비엔주식회사
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    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04H—BUILDINGS OR LIKE STRUCTURES FOR PARTICULAR PURPOSES; SWIMMING OR SPLASH BATHS OR POOLS; MASTS; FENCING; TENTS OR CANOPIES, IN GENERAL
    • E04H9/00—Buildings, groups of buildings or shelters adapted to withstand or provide protection against abnormal external influences, e.g. war-like action, earthquake or extreme climate
    • E04H9/02—Buildings, groups of buildings or shelters adapted to withstand or provide protection against abnormal external influences, e.g. war-like action, earthquake or extreme climate withstanding earthquake or sinking of ground
    • E04H9/025—Structures with concrete columns
    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04H—BUILDINGS OR LIKE STRUCTURES FOR PARTICULAR PURPOSES; SWIMMING OR SPLASH BATHS OR POOLS; MASTS; FENCING; TENTS OR CANOPIES, IN GENERAL
    • E04H9/00—Buildings, groups of buildings or shelters adapted to withstand or provide protection against abnormal external influences, e.g. war-like action, earthquake or extreme climate
    • E04H9/02—Buildings, groups of buildings or shelters adapted to withstand or provide protection against abnormal external influences, e.g. war-like action, earthquake or extreme climate withstanding earthquake or sinking of ground
    • E04H9/027—Preventive constructional measures against earthquake damage in existing buildings

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  • Engineering & Computer Science (AREA)
  • Architecture (AREA)
  • Business, Economics & Management (AREA)
  • Emergency Management (AREA)
  • Environmental & Geological Engineering (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Working Measures On Existing Buildindgs (AREA)

Abstract

The present invention relates to a seismic retrofit in which a rectangular steel frame installed in an opening of a structure has a variable structure to be able to change the size thereof, and a preferred method of constructing the same. The seismic retrofit for an opening of a structure according to the present invention is a seismic retrofit for retrofitting an opening of a structure surrounded by vertical structures on both sides and upper and lower horizontal structures. The seismic retrofit according to the present invention comprises: corner frames made of an L-shaped rectangular steel pipe and installed to be fixed to the four corners of an opening of a structure; longitudinal frames installed to connect between the corner frames while adjusting an insertion length in a state in which both ends thereof are inserted into the rectangular steel pipes of the corner frames; and a filling material filled in the rectangular steel pipe of the corner frame to integrate the corner frame and the longitudinal frame and is characterized by varying according to the degree of insertion of the longitudinal frame. The method of constructing a seismic retrofit for an opening of a structure according to the present invention comprises: a first step of assembling a corner frame and a longitudinal frame into a rectangular frame to fit the size of an opening of a structure; a second step of installing and fixing the rectangular frame assembled in the first step to fit the opening of the structure; and a third step of filling a filling material in the corner frame.

Description

Seismic Retrofit of Building Structures Using Changeable Steel-Frame and Construction Method Thereof}

The present invention relates to a seismic reinforcement structure that is seismic reinforcement by installing a rectangular steel frame in the opening of the structure surrounded by the vertical structure on both sides and the horizontal structure of the upper, lower, and more specifically, the rectangular steel frame installed in the opening of the structure It relates to a seismic reinforcement structure and a preferred construction method consisting of a variable structure that can be changed in size.

In general, the building is provided with openings for windows for mining, ventilation, inflow and outflow. Openings are more concentrated in stress than other parts, especially when horizontal loads such as earthquakes can cause tensile cracking at the openings, leading to building collapse. As a result, reinforced concrete buildings completed before 1989, when the seismic design standards were enacted, may not have sufficient seismic performance and may cause great damage due to structural damage caused by openings during earthquakes.

Various seismic reinforcement methods have been applied to minimize human and physical damage from earthquakes. As a representative seismic reinforcement method, there is a method of installing a vibration suppression device. As a vibration suppression device, a brace damper is installed in a diagonal direction to dissipate energy by plastic hysteresis behavior when a cyclic load is applied by an earthquake. However, the conventional method of installing the vibration suppression device requires a structural member having a large rigidity such as a pillar or a beam for supporting the brace damper, which is difficult in construction, and requires a separate installation space, thereby limiting its applicability. The disadvantage is that it obscures the field of view.

In order to improve the shortcomings of the damper-type damper, a seismic reinforcing method as shown in FIG. 1 has been proposed. As can be seen by fixing the hinged square frame rotatably at the corner of the building opening in the corner, the damper for absorbing the vibration energy in the inner corner of the square frame to install plastic behavior. This method is advantageous in that it can be modularized and secure enough space for installing windows by minimizing the disturbance of the occupants' view. However, since the frame and the damper support all the loads, the efficiency of load distribution against seismic force decreases, and for the effective reinforcement, a member having a large cross-sectional performance is required, and the view is still obscured by the edge damper.

In order to improve the seismic reinforcing method of Figure 1, the present inventors proposed a seismic reinforcing method as shown in FIG. The seismic reinforcement method of FIG. 2 is in accordance with Patent No. 10-1165320, in which a steel frame is installed in a building opening, and a reinforced concrete wall is installed in an inner lower portion of the steel frame. The lower part of the building opening is reinforced with reinforced concrete walls while reducing the moment arm length that the steel frame must support. By the way, the seismic reinforcement method of Figure 2, because the steel frame to be manufactured in accordance with the size of the opening of the structure, when the size of the opening of the structure is inconvenient to produce a steel frame in various sizes accordingly. In addition, since the steel frame is made of expensive H-shaped steel, and especially the brace frame is added for shear reinforcement of the edge (panel zone), the construction cost is increased due to the increase in material cost.

The present invention was developed to improve the disadvantages of using a steel frame produced in a predetermined size in a seismic reinforcement structure by a conventional steel frame, a square steel frame to be applied while flexibly corresponding to various sizes of the structure opening There is a technical problem in providing a seismic reinforcing structure composed of a variable structure and its preferred construction method.

In addition, the present invention is to provide a seismic reinforcement structure by a new steel frame that can reduce the material cost by using a cheap concrete instead of reducing the use of expensive form steel.

The present invention to solve the above technical problem is a seismic reinforcement structure for seismic reinforcement structure for seismic reinforcement of the structure surrounded by the vertical structure on both sides and the upper and lower horizontal structure, provided as L-shaped square steel pipe fixed to each of the four corners of the structure opening Corner frame; A length frame installed at both ends to connect the corner frames while adjusting the length of the pull in a state in which the inside of the square steel pipe is inserted into the corner frame; Filled inside the square steel pipe of the corner frame to integrate the corner frame and the length frame; comprising a, the seismic reinforcement structure of the structure opening by the variable steel frame, characterized in that it is variable depending on the degree of entry of the length frame To provide.

In another aspect, the present invention provides a method for constructing a seismic reinforcement structure of the structure opening, the first step of assembling the corner frame and the length frame in a rectangular frame in accordance with the size of the structure opening; A second step of fixing the square frame assembled in the first step to the opening of the structure; The third step of filling the filler in the corner frame; Provides a method for constructing a seismic reinforcement structure of the structure opening by a variable steel frame, characterized in that consisting of.

According to the present invention, the following effects can be expected.

First, the present invention is divided into a frame of a square steel frame installed in the opening of the structure for seismic reinforcement into a corner frame by a square steel pipe and a length frame by a conventional steel member to configure the length frame into a structure that can be inserted into the corner frame By adjusting the length of the length frame, the size of the entire rectangular frame can be adjusted in various ways. Accordingly, the present invention can be applied flexibly to various sizes of structure openings even with materials of a certain standard.

Second, the present invention can reduce the material cost because the use of steel pipes and fillers in place of expensive shaped steel.

Thirdly, the present invention synthesizes the corner portion (panel zone) where the strength is concentrated in the square steel frame to the composite structure (CFT structure) by combining the steel pipe and the filling material can effectively strengthen the strength of the corner portion without additional reinforcement material Therefore, the present invention exhibits excellent seismic reinforcing performance.

1 shows a seismic reinforcing structure of a conventional structure opening.
2 shows a seismic reinforcing structure of a structure opening according to Patent No. 10-1165320.
Figure 3 is an installation overview of the seismic reinforcement structure of the structure opening by the variable steel frame according to the present invention.
4 is a detailed view of the corner frame and the length frame in FIG.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will now be described in detail with reference to the accompanying drawings and preferred embodiments.

Figure 3 is an installation overview of the seismic reinforcement structure of the structure opening by the variable steel frame according to the present invention. The present invention relates to an earthquake-resistant reinforcement structure by installing a square steel frame in a structure opening surrounded by a vertical structure (S1) and upper and lower horizontal structures (S2) on both sides, and installing a square steel frame at a corner. The frame is divided into a length frame 120 to be installed in the length between the corner frame 110 and the corner, while the corner frame 110 is provided with a square steel pipe and the end of the length frame 120 in the state inserted therein Is characterized in that it is configured to charge the filler 130 in. In the rectangular steel frame installed to fit the opening of the structure, the edge part (panel zone) is completed by the CFT structure, while the length part is completed by the steel structure. In particular, since the edge portion where the strength is concentrated is finished in the CFT structure in which the steel frame and the filler are synthesized, it exhibits excellent shear strength without providing any additional reinforcing materials (such as haunches and braces).

In the present invention, the corner frame 110 is provided as an L-shaped square steel pipe is fixed to each of the four corners of the structure opening. Corner frame 110 may be fixedly installed in the vertical and horizontal structures (S1, S2) of the structure opening in a number of ways, but preferably fixed to the vertical and horizontal structures (S1, S2) with a chemical anchor (F1) in the gap between When the filler (F2, non-shrink mortar, high-performance injection agent, etc.) is treated in a manner of filling, integration with the vertical and horizontal structures S1 and S2 can be achieved. Alternatively, the filler (F2) may be fixed by the chemical anchor (F1) while installing the elastic insulating material, since the elastic insulating material is installed without gaps while responding flexibly, it contributes to securing the thermal insulation performance and contributes to the seismic load absorption. After fixing with the chemical anchor (F1) to cover the anchor cap to protect the chemical anchor (F1). On the other hand, since the corner frame 110 is provided with a square steel pipe, it is not easy to install the anchor F1, so that the wing plate 111 is extended to the outer corner plate of the square steel pipe corner frame 110, and the wing plate 111 is provided. It is preferable to provide anchor F1 at () (see FIG. 3 (b)).

In the present invention, the length frame 120 is a member that is installed to connect between the corner frame 110, both ends are installed in the inside of the square steel pipe of the corner frame 110. At this time, since the length of the inlet of the length frame 120 can be freely adjusted, the square steel frame completed by the assembly of the corner frame 110 and the length frame 120 becomes a variable structure that can be changed to various sizes. Since the length frame 120 is installed inside the corner frame 110, the length frame 120 is provided with the same or smaller size as the inner circumferential cross section of the square steel pipe of the corner frame 110. H-steel, an angle, a channel, a square steel pipe with a flange, etc. If it is a member, it is suitable, Most preferably, it is provided with H-shaped steel. Length frame 120 by the H-shaped steel reinforcement stiffener 123 in the middle can be reinforced by bonding. In FIG. 3 (b), the H-shaped steel length frame 120 having a smaller size than the square steel pipe cross section of the corner frame 110 may be inserted into the corner frame 110.

On the other hand, since the length frame 120 is integrated with the corner frame 110 by the filling of the filling material 130, it may not be fixedly installed in the structure opening, but in order to secure the installation stability, the anchor (F1) like the corner frame 110 is advantageous. ), A filler (F2), an elastic insulating material or the like is preferably fixed to the vertical and horizontal structures (S1, S2) of the opening of the structure. If the anchor (F1) is provided with a steel frame member having a sufficient cross-section (for example, H-shaped steel, etc.), the anchor (F1) may be installed on the flange of the length frame 120, in some cases the wing plate 121 on the flange It is also possible to extend the joint and to install the anchor (F1) on the wing plate 121 (see Fig. 3 (c)). In particular, since the length frame 120 is installed inside the corner frame 110, it is inevitably installed in the vertical and horizontal structures (S1, S2) of the structure opening at least the thickness of the corner frame (110), the clearance space at this time Silver can be reliably filled with a filler (F2) or elastic insulating material.

In addition, the length frame 120 may be connected to the stud 122 is installed at the end, the stud 122 is embedded in the filler 130 in the corner frame 110, the length frame 120 and the corner frame 110 To strengthen the integration of In FIG. 3B, a stud 122 having a shear head is applied.

The filler 130 is filled in the corner frame 110 to integrate the corner frame 110 and the length frame 120. The filler 130 may be appropriately prepared with cement or epoxy, but may be prepared with a material having a predetermined strength so that the filler 130 may be combined with the corner frame 110 to exhibit an effective synthetic strength.

The seismic reinforcement structure of the structure opening by the variable steel frame as shown in Figure 3, after assembling the square steel frame to the corner frame 110 and the length frame 120, the square steel frame fixed to the opening of the structure Next, it is preferable to construct the process by filling the filler 130 in the corner frame 110. At this time, the corner frame 110 and the length frame 120 are manufactured to a certain standard in the factory, and then assembled into a square steel frame while adjusting the length of the length frame 120 to fit the size of the structure opening to be constructed. After inserting and installing inside the frame 110, it is assembled by a process of welding (welding or bolting). This assembly process can be carried out in the construction site as well as the manufacturing plant of the corner frame 110 and the length frame 120. The assembled square steel frame is fixedly installed by carrying in the opening position of the structure to be constructed, and then fills the filler 130 in the corner frame 110.

4 is a detailed view of the corner frame 110 and the length frame 120 in FIG. As shown, the length frame 120 is installed inside the corner frame 110. After the length frame 120 is installed, the filler 130 is filled in the corner frame 110. At this time, the filler 130 is closed at the end of the corner frame 110 to prevent the filler 130 from leaking out of the corner frame 110. The plate 140 can be bonded to each other. However, when the closing plate 140 is installed, it is necessary to provide the inlet 142 for the filling of the filler 130 and the air outlet 112 for the air discharge, the inlet 142 to the air outlet 112 What is necessary is to provide in the corner frame 110 or the closed plate 140. In FIG. 4, the H-beam length frame 120 penetrates the closing plate 140 and is installed in the corner frame 110. In addition, the closing plate 140 is provided with an injection hole 142, and the corner frame 110 is provided. The air outlet 112 is provided in the.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, the present invention is not limited to the above-described exemplary embodiments, and various modifications, additions and substitutions may be made without departing from the scope of the present invention. And the scope of the present invention is defined by the appended claims.

110: corner frame
111: wing plate
112: air outlet
120: length frame
121: wing plate
122: stud
123: reinforcement stiffener
130: filling material
140: closed plate
142: injection hole
S1: vertical structure
S2: horizontal structure
F1: anchor
F2: Filler

Claims (6)

As a seismic reinforcing structure for seismic reinforcing the opening of the structure surrounded by the vertical structure (S1) and the upper and lower horizontal structure (S2) on both sides,
Corner frame 110 is provided as an L-shaped square steel pipe is fixed to each of the four corners of the structure opening;
A length frame (120) installed at both ends to connect the corner frames (110) while controlling the degree of drawing in a state in which the corner frames (110) are inserted into the rectangular steel pipe;
Filler 130 is filled in the square steel pipe of the corner frame 110 to integrate the corner frame 110 and the length frame 120;
It is configured to include, the seismic reinforcement structure of the structure openings by a variable steel frame, characterized in that the variable according to the degree of introduction of the length frame. In claim 1,
The corner frame 110, the closing plate 140 to close the gap between the length frame 120 is installed at the end,
The filler 130, the seismic reinforcement structure of the structure opening by the variable steel frame, characterized in that the filling is injected through the injection hole 142 formed in the corner frame 110 or the closed plate 140. In claim 1,
The length frame 120, the stud 122 is attached to the end of the structure opening by the variable steel frame, characterized in that the stud 122 is installed to be embedded in the filler 130 in the corner frame 110 inside. Seismic reinforcement structure. In claim 1,
The length frame 120 is provided as a steel frame member having a flange is a variable steel frame, characterized in that the anchor (F1) is installed on the wing plate 121 is extended to the flange or the flange is fixed to the opening of the structure Seismic reinforcement structure of structure opening by 5. The method according to any one of claims 1 to 4,
The corner frame 110 is fixed to the opening of the structure by the anchor (F1) is installed on the wing plate 111 is extended to the outer corner plate surface of the square steel pipe of the structure opening by a variable steel frame Seismic reinforcement structure. As a method of constructing a seismic reinforcement structure of the structure opening according to claim 1,
A first step of assembling the corner frame 110 and the length frame 120 into a rectangular frame in accordance with the size of the structure opening;
A second step of fixing the square frame assembled in the first step to the opening of the structure;
A third step of filling the filler 130 in the corner frame 110;
Seismic reinforcement structure construction method of the structure opening by a variable steel frame, characterized in that consisting of.
KR1020130102526A 2013-08-28 2013-08-28 Seismic retrofit of building structures using changeable steel-frame and construction method thereof KR101379892B1 (en)

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Cited By (19)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101480057B1 (en) * 2014-06-23 2015-01-09 한국복합섬유 주식회사 Seismic reinforcement device using t-type steel frame and concrete, and method for constructing the same
KR101489848B1 (en) * 2014-06-23 2015-02-06 (주)정우구조엔지니어링 Structure for seismic-proofing opening parts by pretensioning to steel frame using wire rope, and construction method for the same
KR101522821B1 (en) * 2014-10-29 2015-05-26 김기태 Seismic strengthening structure of opening of building and method using Seismic strengthening structure of opening of building
KR101778040B1 (en) * 2016-09-05 2017-09-14 주식회사 에스엠피건설 Earthquake Exterior Composite Reinforcing Method
KR101826190B1 (en) * 2017-07-24 2018-03-22 비코비엔주식회사 Reinforcing frame with length regulating means and construction method of the same
KR101878861B1 (en) * 2017-11-23 2018-07-16 주식회사 비에스이엔씨 SEISMIC RETROFIT FRAME FOR OPENINGS OF BUIlDING
KR20180098450A (en) * 2017-02-24 2018-09-04 (주)더나은구조엔지니어링 Seismic Strengthening Method For School Building
KR101900459B1 (en) 2018-04-16 2018-09-19 주식회사 오케이건설 Method and Structure for Reinforcing Seismic Resistance of Windows
KR101927711B1 (en) * 2018-05-04 2018-12-11 조청환 Earthquake proof reinforcing method for opening parts of apartment house
CN109279177A (en) * 2018-11-23 2019-01-29 苏州瑞至通建筑科技有限公司 A kind of double-layer scaffold for horizontal member
KR101950954B1 (en) * 2018-05-09 2019-02-21 유시봉 Variable connection structure for earthquake-proof reinforcement and construction method
KR102017546B1 (en) * 2018-04-16 2019-09-03 주식회사 오케이건설 Method and Structure for Reinforcing Seismic Resistance of Windows
KR102097234B1 (en) 2019-05-09 2020-04-03 주종천 Earthquake-Resistant construction window
KR102143566B1 (en) * 2019-09-16 2020-08-11 (주)아리수엔지니어링 Seismic retrofit structure using fixing device for reinforcing panel zone and construction method thereof
KR102187658B1 (en) * 2020-05-29 2020-12-07 경북대학교 산학협력단 Seismic reinforcement composite using composite material frame and its construction method
KR20210009045A (en) * 2019-07-16 2021-01-26 손찬우 Steel Structure for Seismic Retrofit of Buildings and Seismic Retrofit Method Using It
KR20220000315A (en) 2020-06-25 2022-01-03 (주)세욱실업 Seismic multi-window system
KR102462907B1 (en) 2021-11-25 2022-11-04 (주)한국건축구조연구원 Seismic reinforceme bracing steel frame and seismic reinforceme method using the same
KR102523930B1 (en) 2022-10-21 2023-04-20 주식회사 거원산업 Hinge-type Seismic Reinforcement Frame

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KR101253519B1 (en) * 2012-11-06 2013-04-11 주식회사 힐 엔지니어링 Method of aseismic reinforcement for existing building structure using pre cast concrete filled steel tube

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KR101253519B1 (en) * 2012-11-06 2013-04-11 주식회사 힐 엔지니어링 Method of aseismic reinforcement for existing building structure using pre cast concrete filled steel tube

Cited By (24)

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Publication number Priority date Publication date Assignee Title
KR101489848B1 (en) * 2014-06-23 2015-02-06 (주)정우구조엔지니어링 Structure for seismic-proofing opening parts by pretensioning to steel frame using wire rope, and construction method for the same
KR101480057B1 (en) * 2014-06-23 2015-01-09 한국복합섬유 주식회사 Seismic reinforcement device using t-type steel frame and concrete, and method for constructing the same
KR101522821B1 (en) * 2014-10-29 2015-05-26 김기태 Seismic strengthening structure of opening of building and method using Seismic strengthening structure of opening of building
KR101778040B1 (en) * 2016-09-05 2017-09-14 주식회사 에스엠피건설 Earthquake Exterior Composite Reinforcing Method
KR101951095B1 (en) * 2017-02-24 2019-02-22 (주)더나은구조엔지니어링 Seismic Strengthening Method For School Building
KR20180098450A (en) * 2017-02-24 2018-09-04 (주)더나은구조엔지니어링 Seismic Strengthening Method For School Building
KR101826190B1 (en) * 2017-07-24 2018-03-22 비코비엔주식회사 Reinforcing frame with length regulating means and construction method of the same
KR101878861B1 (en) * 2017-11-23 2018-07-16 주식회사 비에스이엔씨 SEISMIC RETROFIT FRAME FOR OPENINGS OF BUIlDING
KR102017546B1 (en) * 2018-04-16 2019-09-03 주식회사 오케이건설 Method and Structure for Reinforcing Seismic Resistance of Windows
KR101900459B1 (en) 2018-04-16 2018-09-19 주식회사 오케이건설 Method and Structure for Reinforcing Seismic Resistance of Windows
KR101927711B1 (en) * 2018-05-04 2018-12-11 조청환 Earthquake proof reinforcing method for opening parts of apartment house
KR101950954B1 (en) * 2018-05-09 2019-02-21 유시봉 Variable connection structure for earthquake-proof reinforcement and construction method
CN109279177A (en) * 2018-11-23 2019-01-29 苏州瑞至通建筑科技有限公司 A kind of double-layer scaffold for horizontal member
KR102097234B1 (en) 2019-05-09 2020-04-03 주종천 Earthquake-Resistant construction window
KR102232526B1 (en) * 2019-07-16 2021-03-26 손찬우 Steel Structure for Seismic Retrofit of Buildings and Seismic Retrofit Method Using It
KR20210009045A (en) * 2019-07-16 2021-01-26 손찬우 Steel Structure for Seismic Retrofit of Buildings and Seismic Retrofit Method Using It
WO2021054698A1 (en) * 2019-09-16 2021-03-25 (주)아리수엔지니어링 Anti-seismic reinforcement structure using panel zone reinforcing fixtures and construction method therefor
KR102143566B1 (en) * 2019-09-16 2020-08-11 (주)아리수엔지니어링 Seismic retrofit structure using fixing device for reinforcing panel zone and construction method thereof
US11927029B2 (en) 2019-09-16 2024-03-12 Arisu Engineering Co., Ltd. Anti-seismic reinforcement structure using panel zone reinforcing fixtures and construction method therefor
KR102187658B1 (en) * 2020-05-29 2020-12-07 경북대학교 산학협력단 Seismic reinforcement composite using composite material frame and its construction method
WO2021241859A1 (en) * 2020-05-29 2021-12-02 경북대학교 산학협력단 Seismic reinforcement composite using composite material frame and method for constructing same
KR20220000315A (en) 2020-06-25 2022-01-03 (주)세욱실업 Seismic multi-window system
KR102462907B1 (en) 2021-11-25 2022-11-04 (주)한국건축구조연구원 Seismic reinforceme bracing steel frame and seismic reinforceme method using the same
KR102523930B1 (en) 2022-10-21 2023-04-20 주식회사 거원산업 Hinge-type Seismic Reinforcement Frame

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