Seismic reinforcement structure of rahmen frame

Abstract

The present invention relates to a seismic reinforcement structure for a rigid frame, wherein an H-shaped steel column and a steel beam, respectively connected to the front of the column and beam of the existing rigid frame, are connected by a corner joint to form a reinforcement frame, and the rigid frame and the reinforcement frame are connected by a load transfer member, the ends of which are connected to the panel zone and the corner joint of the rigid frame, thereby providing excellent constructability and minimizing damage to the rebar of the existing frame. The seismic reinforcement structure for a rigid frame according to the present invention is intended to seismically reinforce an existing rigid frame composed of reinforced concrete columns and beams, and comprises: a steel column made of an H-shaped steel provided on the front of the column of the rigid frame; a steel beam made of an H-shaped steel provided on the front of the beam of the rigid frame; a corner joint connecting the steel column and the steel beam; and a load transfer member, the rear end of which is fixedly installed in the panel zone of the rigid frame and the front end of which is connected through the corner joint. The corner joint is composed of a frame body formed in the shape of a box with open front and rear ends, a joint portion that is spaced apart from the frame body and into which the load transfer member is inserted and connected, and a plurality of damping plates connecting the frame body and the joint portion.

Description

Technology Field

[0001] The present invention relates to a seismic reinforcement structure for a rigid frame, wherein an H-shaped steel column and a steel beam, respectively connected to the front of the column and beam of the existing rigid frame, are connected by a corner joint to form a reinforcement frame, and the rigid frame and the reinforcement frame are connected by a load transfer member, the ends of which are connected to the panel zone and the corner joint of the rigid frame, thereby providing excellent constructability and minimizing damage to the reinforcing bars of the existing frame. Background Technology

[0003] Recently, as the frequency and intensity of earthquakes have increased domestically, the issue of ensuring the stability of buildings against earthquakes has come to the forefront, and consequently, institutional demands for seismic reinforcement of existing buildings are being strengthened.

[0004] In Korea, seismic design was first introduced in 1988, but it was applied only to buildings with six or more stories, so many low-to-mid-rise buildings were not subject to seismic design. However, as numerous cases of earthquake damage to low-to-mid-rise buildings were reported during the Gyeongju and Pohang earthquakes, it was not until 2017 that the scope of seismic design was expanded to include buildings with two or more stories or a gross floor area of ​​200 m² or more, as well as new housing.

[0005] In particular, most existing school and military buildings are constructed as low-to-mid-rise structures and often lack seismic design. Consequently, seismic reinforcement of these buildings is urgent, and various technologies have been developed to strengthen existing structures.

[0006] For example, there is a technology for reinforcing an existing rigid frame by installing a steel reinforcement structure inside an existing rigid frame composed of columns and beams (Registered Patent No. 10-1185974, Registered Patent No. 10-1197971, etc.).

[0007] The above technology requires the removal of masonry walls inside the existing rigid frame to install the reinforcement frame, resulting in a large scale of construction and inevitably suspending the use of the building during construction. Furthermore, since the reinforcement frame is installed inside the rigid frame, it is difficult to respond on-site in the event of manufacturing errors in the reinforcement members. In addition, the reinforcement frame is fixed to the existing frame using multiple chemical anchors; however, the installation process of chemical anchors may lead to numerous complaints due to noise and dust, requires a long construction time, and may result in reduced load-bearing capacity and structural damage if the rebar is damaged due to excessive drilling.

[0008] In addition, there is an external attachment type reinforcement technology that installs a reinforcement frame on the front of the existing rigid frame structure (Registered Patent No. 10-1623848, Registered Patent No. 10-1827200, etc.). While this technology does not require the removal of the masonry walls inside the existing frame, the reinforcement frame is still joined to the existing frame using multiple chemical anchors. Consequently, this results in poor constructability, a risk of public complaints, and potential degradation of structural stability. The problem to be solved

[0010] To solve the aforementioned problems, the present invention aims to provide a seismic reinforcement structure for a rigid frame that offers excellent constructability while minimizing damage to the reinforcing bars of the existing frame. means of solving the problem

[0012] The present invention, according to a preferred embodiment, is for seismically reinforcing an existing rigid frame structure composed of reinforced concrete columns and beams, and comprises: a steel column, which is an H-shaped steel provided on the front of the column of the rigid frame structure; a steel beam, which is an H-shaped steel provided on the front of the beam of the rigid frame structure; a corner joint connecting the steel column and the steel beam; and a load transfer member, the rear end of which is fixedly installed in the panel zone of the rigid frame structure and the front end of which is penetratingly connected to the corner joint; wherein the corner joint is composed of a frame body formed in a box shape with the front and rear ends open, a connection part spaced apart from the frame body and into which the load transfer member is inserted and connected, and a plurality of damping plates connecting the frame body and the connection part.

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[0018] According to another preferred embodiment, the present invention provides a rigid frame seismic reinforcement structure characterized in that the connection portion between the load transfer member and the corner joint portion is composed of a square tube, and the shear portion of the load transfer member is fitted into the connection portion.

[0019] According to another preferred embodiment, the present invention provides a seismic reinforcement structure for a rigid frame, characterized in that an anchor bar is installed to protrude from the front surface of a column or beam of the rigid frame, a stud bolt is installed on the back surface of the web of the steel column or steel beam, and reinforcing concrete is poured between the column and the steel column or between the beam and the steel beam.

[0020] According to another preferred embodiment, the present invention provides a rigid frame seismic reinforcement structure characterized by having spiral reinforcing bars that are continuously bent into a square shape and mounted on anchor bars or stud bolts within the reinforcing concrete. Effects of the invention

[0022] According to the present invention, for seismic reinforcement of an existing rigid frame, an H-shaped steel column and a steel beam, which are respectively connected to the front of the column and beam of the existing rigid frame, are connected by a corner joint to form a reinforcing frame, and a rear end of a load transfer member is fixed to the panel zone of the rigid frame and a front end is connected through the corner joint to connect the rigid frame and the reinforcing frame, thereby providing a rigid frame seismic reinforcement structure.

[0023] Accordingly, constructability is excellent, and lateral loads acting on the existing rigid frame can be smoothly transferred to the reinforcing frame through the load transfer member.

[0024] In addition, since the reinforcing frame only needs to be connected to the rigid frame by load transfer members in the panel zone, the number of connection points can be minimized, thereby reducing damage to the reinforcing bars of the existing frame and shortening the construction period. Brief explanation of the drawing

[0026] FIG. 1 is a perspective view illustrating the connection relationship between an existing rigid frame and a reinforcing frame. FIG. 2 is a perspective view illustrating a state in which a reinforcing frame is installed on an existing frame structure. FIG. 3 is an enlarged view illustrating the joint between the frame and the reinforcing frame in FIG. 2. FIG. 4 is a cross-sectional view illustrating the combined state of the corner joint and the load transfer member. FIG. 5 is a perspective view illustrating the connection relationship of a separable corner joint. FIG. 6 is a perspective view showing the state in which the corner joint shown in FIG. 5 is installed. FIG. 7 is a perspective view illustrating the coupling relationship of a load transfer member according to another embodiment. FIG. 8 is a cross-sectional view illustrating the state in which the load transfer member shown in FIG. 7 is installed. FIG. 9 is a perspective view illustrating the coupling relationship of a load transfer member according to another embodiment. FIG. 10 is a perspective view showing the state in which the load transfer member illustrated in FIG. 9 is installed. FIG. 11 is a perspective view illustrating another embodiment of a corner joint. FIG. 12 is a front view illustrating the state in which an extension column and an extension beam are combined at a corner joint. FIG. 13 is a perspective view illustrating a corner joint equipped with a reader-type damping plate. FIG. 14 is a perspective view illustrating a corner joint equipped with an in-plane damping plate. FIG. 15 is a cross-sectional view showing the state in which the corner joint shown in FIG. 13 is installed. FIG. 16 is a perspective view illustrating the connection relationship of the cover plate. FIG. 17 is a perspective view illustrating a spiral reinforcing bar. FIG. 18 is a perspective view illustrating the state in which spiral reinforcement is installed between a beam and a steel beam. FIG. 19 is a perspective view illustrating the state in which reinforced concrete is constructed in FIG. 18. Specific details for implementing the invention

[0027] The present invention will be described in detail below according to the attached drawings and preferred embodiments.

[0029] FIG. 1 is a perspective view illustrating the connection relationship between an existing rigid frame and a reinforcing frame, and FIG. 2 is a perspective view illustrating the state in which a reinforcing frame is installed on an existing rigid frame. FIG. 3 is an enlarged view illustrating the connection between the rigid frame and the reinforcing frame in FIG. 2, and FIG. 4 is a cross-sectional view illustrating the connection state between the corner connection and the load transfer member.

[0030] As illustrated in FIGS. 1 to 4, the seismic reinforcement structure of the present invention is intended to seismically reinforce an existing rigid frame (1) composed of reinforced concrete columns (11) and beams (12), and is characterized by comprising: a steel column (3) which is an H-shaped steel provided on the front of the column (11) of the rigid frame (1); a steel beam (4) which is an H-shaped steel provided on the front of the beam (12) of the rigid frame (1); a corner joint (5) connecting the steel column (3) and the steel beam (4); and a load transfer member (6) whose rear end is fixedly installed in the panel zone of the rigid frame (1) and whose front end is connected through the corner joint (5).

[0031] The present invention is intended to provide a seismic reinforcement structure for a rigid frame that has excellent constructability and can minimize damage to the reinforcing bars of the existing rigid frame when seismically reinforcing an existing rigid frame (1).

[0032] The present invention is intended to seismically reinforce an existing frame structure (1) composed of columns (11) and beams (12).

[0033] The above columns (11) and beams (12) are reinforced concrete members.

[0034] A reinforcing frame (2) for reinforcing an existing frame structure (1) is composed of steel columns (3) and steel beams (4). The steel columns (3) and steel beams (4) are joined by corner joints (5) to form a rectangular reinforcing frame (2) overall.

[0035] The above steel columns (3) and steel beams (4) are each provided on the front of the columns (11) and beams (12) of the existing frame structure (1).

[0036] The above steel columns (3) and steel beams (4) may each be composed of H-shaped steels consisting of flanges (31, 41) and webs (32, 42). The steel columns (3) and steel beams (4) may be arranged such that the strong axis direction of the cross-section is aligned with the transverse direction of the rigid frame (1), thereby seismically reinforcing the rigid frame (1) against loads acting in the transverse direction.

[0037] The above corner joint (5) is joined to the frame frame (1) by a load transfer member (6).

[0038] The load transfer member (6) has its rear end fixedly installed on the front of the panel zone where the column (11) of the frame (1), specifically the column (11) and the beam (12) are joined, and its front end is joined to the corner joint (5).

[0039] At this time, the shear of the load transfer member (6) penetrates the corner joint (5) and is joined.

[0040] Accordingly, the lateral load acting on the existing frame (1) is transferred to the reinforcing frame (2) through the load transfer member (6).

[0041] In addition, since the above reinforcing frame (2) only needs to be joined to the existing frame frame (1) by the load transfer member (6) in the panel zone, the number of joining points can be minimized to reduce damage to the reinforcing bars and shorten the construction period.

[0043] FIG. 5 is a perspective view illustrating the connection relationship of a separable corner joint, and FIG. 6 is a perspective view illustrating the state in which the corner joint shown in FIG. 5 is installed.

[0044] As shown in FIGS. 5 and 6, the corner joint (5) is composed of a pair of flanges (51) and a web (52) extending from the end of the steel beam (4), and the load transfer member (6) can be joined to the corner joint (5) by a fixing nut (N) that penetrates the web (52) of the corner joint (5) and is fastened to the front surface of the web (52).

[0045] The above corner joint (5) can be formed with an H-shaped cross-section identical to that of the steel beam (4).

[0046] That is, the corner joint (5) may be composed of a pair of flanges (51) and a web (52).

[0047] At this time, the corner joint (5) can be formed as a separate member from the steel beam (4) (Fig. 5). Alternatively, as shown in Fig. 3, the steel beam (4) can be extended toward the column (11) to form the corner joint (5) and the steel beam (4) as a single unit.

[0048] When the corner joint (5) and the steel beam (4) are formed as separate members, the corner joint (5) can be joined to the steel column (3) and the steel beam (4) by bolts or welding.

[0049] When the corner joint (5) is formed integrally by extending from the steel beam (4), a stiffener (43) may be provided at the boundary between the steel beam (4) and the corner joint (5) (Fig. 3).

[0050] The above steel column (3) can be joined to the flange (51) of the corner joint (5).

[0051] The load transfer member (6) can be joined by penetrating the web (52) of the corner joint (5).

[0052] A fixing nut (N) can be fastened to the front end of the load transfer member (6) that penetrates the web (52) of the corner joint (5).

[0053] To prevent the fixing nut (N) from loosening, an anti-loosening nut (N') may be further fastened to the front of the fixing nut (N). By fastening the anti-loosening nut (N'), the fixing nut (N) can be prevented from loosening under repeated loads.

[0054] The load transfer member (6) transfers the stress of the rigid frame (1) to the reinforcing frame (2) by means of shear stiffness. In addition, when rotational displacement occurs in the panel zone, rotational displacement can be transferred to the corner joint (5) by means of the torsional stiffness of the load transfer member (6).

[0055] At this time, when rotational displacement occurs in the load transfer member (6), deformation occurs in the web (52) of the corner joint (5), and some of the seismic energy can be dissipated.

[0056] The load transfer member (6) may be provided with a washer (W) on the web (52) side.

[0058] As shown in FIGS. 4 and 5, a shear reinforcing plate (53) through which the load transfer member (6) passes is provided on the front and rear surfaces of the web (52) of the corner joint (5), and can be bolted (B) to the web (52).

[0059] When the corner joint (5) is formed by extending it integrally from the steel beam (4) or when a ready-made H-shaped steel is used as the corner joint (5), the thickness of the web (52) is configured to be relatively thin. Accordingly, when the load of the load transfer member (6) is transferred to the reinforcing frame (2), deformation such as lateral buckling occurs in the web (52) of the corner joint (5), and stress transfer or energy dissipation may not be properly achieved.

[0060] Accordingly, a shear reinforcement plate (53) may be provided on the web (52) of the corner joint (5) so that stress can be smoothly transmitted at the corner joint (5) and stable deformation of the web (52) can be induced to achieve sufficient energy dissipation.

[0061] The shear reinforcement plate (53) is provided on the front and rear sides of the web (52), respectively, and can be fixed to the web (52) by a plurality of bolts (B) or welding.

[0062] At this time, a through hole may be formed in the center of the shear reinforcement plate (53) so that the load transfer member (6) can pass through.

[0064] As shown in FIGS. 4 and 6, the load transfer member (6) may be configured to include a large-diameter long bolt (61).

[0065] As shown in FIG. 4, the large-diameter long bolt (61) can be configured such that its rear end is installed in the panel zone of the column (11), and its front end penetrates the web (52) of the corner joint (5) and protrudes to the front of the web (52).

[0066] The above large-diameter long bolt (61) can be inserted and installed into a coring hole (10) formed by coring a panel zone in the range of M42 to M50, and can be fixed to the panel zone by grouting with adhesive.

[0067] The above-mentioned coring hole (10) can be formed with a size of φ50 mm to φ75 mm on the front of the panel zone of the column (11) using high-speed rotary diamond coring equipment, etc. By using coring equipment in this way, noise can be reduced by more than 80% compared to conventional anchor bolt construction using a hammer drill. Accordingly, in the case of school buildings, reinforcement work can be carried out even during classes.

[0068] In addition, the number of drilling points is significantly reduced, allowing for a substantial reduction in construction time.

[0069] The above large-diameter long bolt (61) can be fixed by cleaning the inside of the coring hole (10), injecting epoxy or inorganic adhesive, and then inserting it. After the adhesive hardens, a reinforcing frame (2) is installed on the front, and a fixing nut (N) is fastened to the protruding end of the large-diameter long bolt (61) on the front of the web (52) of the corner joint (5).

[0070] To adjust the installation level of the above reinforcing frame (2), a level adjustment nut (N) can be fastened to a large-diameter long bolt (61) on the back side of the web (52) of the corner joint (5).

[0071] The above large-diameter long bolt (61) may be a large-diameter threaded bolt, a steel pipe with threads formed on its outer surface, a filled steel pipe with concrete or mortar filled inside the steel pipe with threads formed on its outer surface, etc.

[0072] When rotational displacement occurs in the panel zone, additional energy dissipation is possible through the torsional deformation of the large-diameter long bolt (61).

[0074] FIG. 7 is a perspective view illustrating the connection relationship of a load transfer member according to another embodiment, and FIG. 8 is a cross-sectional view illustrating the state in which the load transfer member shown in FIG. 7 is installed.

[0075] As illustrated in FIGS. 7 and 8, the load transfer member (6) may be composed of a base plate (62) fixedly installed in the panel zone of the frame (1), a connecting nut (63) provided on the front of the base plate (62), and a large-diameter long bolt (61) fastened to the connecting nut (63).

[0076] The load transfer member (6) is installed at four points on the existing frame (1). At this time, if the reinforcing frame (2) is constructed while the load transfer member (6), which is configured to include a large-diameter long bolt (61), is first installed on the existing frame (1), it may be difficult to install the reinforcing frame (2) due to interference from the large-diameter long bolt (61).

[0077] Therefore, the above large-diameter long bolt (61) can be configured to be assembled later.

[0078] To this end, the load transfer member (6) may be composed of a base plate (62), a connecting nut (63), and a large-diameter long bolt (61).

[0079] The above base plate (62) is fixedly installed in the panel zone of the frame structure (1). The above base plate (62) can be fixed to the panel zone by means of anchor bolts (621), etc.

[0080] The above connecting nut (63) is a long nut and can be fixed to the front surface of the base plate (62) by welding or the like.

[0081] To reinforce the above connecting nut (63), a stiffener (64) may be installed between the front of the base plate (62) and the side of the connecting nut (63).

[0082] A large-diameter long bolt (61) is screw-coupled to the above-mentioned connecting nut (63). The large-diameter long bolt (61) can be fastened later after the corner joint (5) is installed, but if necessary, it is also possible to fasten it to the connecting nut (63) in advance before the corner joint (5) is installed.

[0083] The front surface of the above connecting nut (63) may be supported by the web (52) of the corner joint (5) (or the rear side shear reinforcement plate (53) or washer (W) of the web (52)).

[0085] FIG. 9 is a perspective view illustrating the connection relationship of a load transfer member according to another embodiment, and FIG. 10 is a perspective view illustrating the state in which the load transfer member shown in FIG. 9 is installed. FIG. 11 is a perspective view illustrating another embodiment of a corner joint, FIG. 12 is a front view illustrating the state in which an extension column and an extension beam are connected to the corner joint, FIG. 13 is a perspective view illustrating a corner joint equipped with a reader-type damping plate, FIG. 14 is a perspective view illustrating a corner joint equipped with an in-plane direction damping plate, and FIG. 15 is a cross-sectional view illustrating the state in which the corner joint shown in FIG. 13 is installed.

[0086] As illustrated in FIGS. 9 to 15, the corner joint (5) may be composed of a frame body (50) formed in the shape of a box with open front and back, a joint part (54) into which the load transfer member (6) is inserted and joined, spaced apart from the frame body (50), and a plurality of damping plates (55) connecting the frame body (50) and the joint part (54).

[0087] The above corner joint (5) may be configured to include a damping plate (55) so as to be able to exert energy dissipation ability on its own.

[0088] To this end, the corner joint (5) may be composed of a frame body (50), a connecting part (54), and a damping plate (55).

[0089] The above frame body (50) can be configured in the shape of a box with four plates arranged in a rectangular shape on the elevation and open at the front and back.

[0090] The end of a steel column (3) or steel beam (4) can be directly joined to the outside of the above-mentioned frame body (50) (Figs. 9, 10).

[0091] Alternatively, as shown in FIG. 12, an extension column (501) and an extension beam (502) may be extended in an orthogonal direction on the outer side of the frame body (50), a steel column (3) may be installed between adjacent extension columns (501), and a steel beam (4) may be installed between adjacent extension beams (502).

[0092] The above-mentioned connecting part (54) is provided inside the frame body (50) at a distance from the frame body (50). The front end of the load transfer member (6) is connected to the above-mentioned connecting part (54).

[0093] The above-mentioned connecting part (54) may be composed of a steel pipe formed with an interior shape corresponding to the load transfer member (6) (Fig. 11). Accordingly, the front end of the load transfer member (6) can be fitted into the connecting part (54).

[0094] The above-mentioned connecting part (54) is connected to the frame body (50) by a damping plate (55).

[0095] As shown in FIG. 11, the damping plate (55) may be provided in a direction perpendicular to the column surface. In this case, energy dissipation is achieved through the out-of-plane bending deformation of the damping plate (55) for lateral displacement.

[0096] Alternatively, as shown in FIG. 14, multiple damping plates (55) may be arranged in a direction parallel to the column surface so that energy dissipation is achieved through in-plane shear deformation of the damping plates (55).

[0097] In addition, the damping plate (55) may be configured in a dog bone shape with a narrower width in the middle so that a large deformation can occur in the central part of the damping plate (55) (Fig. 13).

[0098] The above reinforcing frame (2) can induce ductile behavior after rigid behavior by means of a corner joint (5) equipped with a damping plate (55).

[0100] FIG. 16 is a perspective view illustrating the connection relationship of the cover plate.

[0101] As illustrated in FIGS. 9, 15, 16, etc., the connection part (54) of the load transfer member (6) and the corner joint part (5) is composed of a square tube, so that the front end of the load transfer member (6) can be fitted into the connection part (54).

[0102] In order to transfer the rotational displacement of the load transfer member (6) to the corner joint (5), the load transfer member (6) and the joint (54) may be composed of square tubes.

[0103] For example, as shown in FIG. 9, the load transfer member (6) and the connecting part (54) may be composed of square steel pipes.

[0104] In this case, the load transfer member (6) can be fixedly installed in the panel zone by the base plate (62).

[0105] The above-mentioned connecting part (54) is composed of a square steel pipe with open front and rear ends, so that the load transfer member (6) can be fitted and connected to the connecting part (54).

[0106] When the load transfer member (6) and the coupling part (54) are composed of square tubes, the coupling part (54) rotates together with the load transfer member (6) when the load transfer member (6) rotates, so that rotational displacement can be transmitted to the corner joint part (5).

[0107] A cover plate (65) may be attached to the front end of the load transfer member (6) so that the corner joint (5) does not detach when the load transfer member (6) is fitted and connected to the joint (54).

[0108] The above cover plate (65) may be formed with an area larger than that of the connecting part (54) and may be detachably connected to the load transfer member (6) by a bolt (B).

[0109] A blocking plate (66) having a bolt fastening hole (661) formed in the center for fastening a bolt (B) may be integrally provided at the front end of the load transfer member (6).

[0111] FIG. 17 is a perspective view illustrating spiral reinforcement, FIG. 18 is a perspective view illustrating the state in which spiral reinforcement is installed between a beam and a steel beam, and FIG. 19 is a perspective view illustrating the state in which reinforced concrete is constructed in FIG. 18.

[0112] As shown in FIGS. 18 and 19, an anchor bar (13) is installed to protrude from the front of the column (11) or beam (12) of the frame (1), a stud bolt (44) is installed on the back of the web (32, 42) of the steel column (3) or steel beam (4), and reinforcing concrete (7) can be poured between the column (11) and the steel column (3) or between the beam (12) and the steel beam (4).

[0113] Depending on the size of the existing frame (1) or the size of the expected load, the reinforcing frame (2) may be attached to the existing frame (1) in a wet manner.

[0114] In this case, a plurality of anchor bars (13) may be installed on the front of the column (11) or beam (12), and a plurality of stud bolts (44) may be installed on the back side of the web (32, 42) of the steel column (3) or steel beam (4). Then, reinforcing concrete (7) may be poured in the space between the column (11) and the steel column (3) or between the beam (12) and the steel beam (4).

[0115] Due to the anchoring force of the anchor bar (13) and stud bolt (44), the reinforcing concrete (7) integrates the column (11) and the steel column (3) or the beam (12) and the steel beam (4), allowing for mutually integrated movement.

[0117] Inside the above reinforcing concrete (7), a spiral reinforcing bar (71) that is continuously bent into a square shape and mounted on an anchor bar (13) or stud bolt (44) may be provided.

[0118] In order to reinforce strength and stiffness by restraining the reinforcing concrete (7) at the overlapping portion of the anchor bar (13) and the stud bolt (44), a spiral reinforcing bar (71) may be placed inside the reinforcing concrete (7).

[0119] At this time, the spiral reinforcing bar (71) can be formed by continuously bending it into a square shape to effectively reinforce the internal concrete and to facilitate fixing during installation (Fig. 17).

[0120] Accordingly, the spiral reinforcing bar (71) can be positioned to be mounted on the upper part of the anchor bar (13) or stud bolt (44) or positioned across the lower part to fix its location. Explanation of the symbols

[0122] 1: Ramen frame 10: Coring hole 11: Pillar 12: Bo 13: Anchor bar 2: Reinforcement Frame 3: Steel column 31: Flange 32: Webb 4: Steel beam 41: Flange 42: Webb 43: Stiffener 44: Stud bolt 5: Corner joint 50: Frame body 501: Extension column 502: Extension 51: Flange 52: Webb 53: Shear reinforcement plate 54: Joint 55: Damping plate 6: Load transfer member 61: Large-diameter long bolt 62: Baseplate 621: Anchor bolt 63: Connecting nut 64: Stiffener 65: Cover plate 66: Pause 661: Bolt fastener 7: Reinforced concrete 71: Spiral rebar B: Bolt N: Fixing nut N': Anti-loosening nut N": Leveling nut W: Washer

Claims

Claim 1 For seismic reinforcement of an existing rigid frame (1) composed of reinforced concrete columns (11) and beams (12), a steel column (3) which is an H-shaped steel provided on the front of the column (11) of the rigid frame (1); a steel beam (4) which is an H-shaped steel provided on the front of the beam (12) of the rigid frame (1); and a corner joint (5) connecting the steel column (3) and the steel beam (4). A seismic reinforcement structure for a rigid frame, comprising: a load transfer member (6) in which the rear end is fixedly installed in the panel zone of the rigid frame (1) and the front end is connected through the corner joint (5); wherein the corner joint (5) is composed of a frame body (50) formed in a box shape with the front and rear ends open, a connecting part (54) in which the load transfer member (6) is inserted and connected while spaced apart from the frame body (50) inside the frame body (50), and a plurality of damping plates (55) connecting the frame body (50) and the connecting part (54). Claim 2 delete Claim 3 delete Claim 4 delete Claim 5 delete Claim 6 delete Claim 7 A rigid frame seismic reinforcement structure according to claim 1, wherein the connection part (54) of the load transfer member (6) and the corner joint part (5) is composed of a square tube, and the shear of the load transfer member (6) is fitted into the connection part (54). Claim 8 A seismic reinforcement structure for a rigid frame according to claim 1, characterized in that an anchor bar (13) is installed to protrude from the front of a column (11) or beam (12) of the rigid frame (1), a stud bolt (44) is installed on the back of a web (32, 42) of a steel column (3) or steel beam (4), and reinforcing concrete (7) is poured between the column (11) and the steel column (3) or between the beam (12) and the steel beam (4). Claim 9 A rigid frame seismic reinforcement structure according to claim 8, characterized in that a spiral reinforcing bar (71) is provided inside the reinforcing concrete (7) and is continuously bent into a square shape and mounted on an anchor bar (13) or stud bolt (44).

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