KR101397886B1 - Method for reinforcing seismic capability of existing moment frames buildings of reinforced concrete by section enlargement - Google Patents

Abstract

The present invention relates to a method for reinforcing strength by enlarging the section of the structural member of an existing reinforced concrete building and, more particularly, to a seismic retrofit method for an existing reinforced concrete moment frame building, which can improve seismic performance by integrating a steel plate concrete composite reinforcing member with the structural member of an existing reinforced concrete moment frame building, particularly with the structural member of a rectangular school building to enhance the strength and stiffness of the existing reinforced concrete moment frame building. According to an appropriate embodiment of the present invention, the seismic retrofit method for an existing reinforced concrete moment frame building by section enlargement comprises the steps of: roughening the exposed surface of a structural member to be reinforced in an existing reinforced concrete moment frame building; fixing a connection member, which includes a pair of longitudinal members installed in parallel along the axis of the structural member to be reinforced with a predetermined gap therebetween and a plurality of transverse members installed in parallel in the direction perpendicular to the longitudinal members with a predetermined gap therebetween to connect the pair of longitudinal members, to the roughened exposed surface of the structural member to be reinforced along the axis of the structural member to be reinforced; coupling a permanent form, which has a U-shaped cross section, to the connection member to cover the exposed surface of the structural member to be reinforced while forming a filler casting space between the permanent form and the exposed surface of the structural member to be reinforced; and casting a filler in the filler casting space between the permanent form and the exposed surface of the structural member to be reinforced.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to reinforced concrete moment frames,

The present invention relates to a method and a reinforcing device for reinforcing the strength by reinforcing the cross section of a structural member of a conventional reinforced concrete building. More particularly, the present invention relates to a reinforced concrete moment frame structure, And more particularly, to a method and an apparatus for reinforcing an existing reinforced concrete moment frame structure that improves seismic performance by increasing the strength and rigidity of a conventional reinforced concrete moment frame structure by integrating the reinforcement members.

Existing buildings constructed before the seismic design criteria were established are expected to suffer considerable damage and collapse due to lack of seismic performance. To solve these problems, the government is continuously conducting seismic performance evaluation and seismic reinforcement projects for public buildings. The government 's existing buildings' seismic strengthening projects are being extensively carried out for schools, local governments' offices, hospitals, fire stations, and other important buildings that serve as shelters for disaster relief and disaster relief in the event of an earthquake.

As the main methods applied to the seismic retrofitting method of existing buildings, new methods of shear wall construction, strength and ductility reinforcement of existing members, and vibration damper application method are applied.

The new construction method of shear wall is limited due to the problem that it requires a substantial reinforcement period because it is accompanied by basic reinforcement, wet construction method, and damages the interior decoration at the location and the impossibility of actual operation when shear walls are installed .

The strength and soft reinforcement method of existing members are required to reinforce most members when they are applied to existing buildings with low seismic performance and the internal space interior is damaged for steel plate reinforcement or aramid fiber reinforcement, There is a problem.

Although the application of the vibration damper is limited to a part of the existing structure, the application of the vibration damper is limited and the application of the vibration damper has been recently extended. However, the vibration damper is expensive and the length of one direction However, when a damper damper is applied, it is limited to a part of the long side, so there is a limit to equally reinforcing the seismic performance of the entire structure.

A new seismic retrofitting method is needed to solve the problems of existing seismic retrofitting methods. In case of seismic retrofitting of existing buildings with weak seismic performance, such as school buildings, It is necessary to develop an economical seismic retrofitting method that can improve the seismic performance of many members considering the characteristics of one long side school building.

Most of the school buildings have different finishes only on the front and rear facades, but the lower part with windows in each floor is constructed as a masonry or concrete wall (hereinafter referred to as "waist wall") with a very short net length. In this case, as shown in the case of earthquake damage in overseas countries, when the earthquake occurs, the column member does not move as a bending member but is brittlely destroyed by shear.

Therefore, in the case of overseas, the gap is formed by inserting the elastic body between the junction of the waist wall and the column. However, when this method is applied, the scope of the construction is not wide enough to be a practical alternative. In addition, even if the joining of the column and the waist wall is continued, the ductility of the column itself is slightly improved, but since the insufficient strength is not improved, it is necessary to reinforce the column in accordance with the necessity of reinforcement.

Also, most of the structural members of existing buildings have very weak ductile capacity because they do not satisfy the interval standard of the seismic design criteria for the stirrup due to the reinforced concrete members. In order to reinforce the ductility of such a member, the steel sheet or the aramid fiber should be reinforced at its front end, which causes problems in economy as described above. Therefore, it is more suitable to improve the seismic performance by strengthening the strength of the building by performing the reinforcement more than the required level in the absence of the existing building, especially the column member.

Therefore, there is a need for an economical seismic retrofitting method that can increase the strength and rigidity of structural members of existing buildings.

In general, the method of applying the reinforcing member and the vibration damper applying method for increasing the strength and stiffness of the building is generally applied to the outdoors of the building. However, since the interior space needs to be continuously used or the interior decoration works, It is preferable to attach to the outside when selecting the construction method. Most of the existing building seismic retrofitting methods have been applied to the existing seismic retrofitting method by constructing reinforcing members on the outside and integrating them with the existing frame, except that the whole of the existing buildings is subjected to the earthquake reinforcement in parallel with the major remodeling construction.

Among the existing buildings, buildings with weak seismic performance are mainly masonry and reinforced concrete (RC) buildings. Most of the buildings in urgent need of earthquake-proofing in the public sector are RC buildings. In the method for reinforcing the earthquake-proof performance of the RC structure, in the conventional method or the vibration damper application method in which the strength and rigidity of the building are increased, a method of joining the column and the beam of the existing RC structure to the new steel component reinforced, A chemical anchor or a buried steel bar is attached to a new steel member and a stud bolt is attached to a new steel member to insert the spiral wire into the anchor or the reinforcing bar and the stud bolt.

In this way, when the anchor or the reinforcing steel of the reinforcing steel member and the stud of the reinforced steel member are overlapped with each other, it is difficult to ensure a stable construction quality.

As a background of the present invention, there is a patent registration 10-1060708 'Joint structure of steel structure for seismic strengthening and joining method' (Patent document 1). This patent discloses a plate material bonded to the surface of a reinforced concrete structure, comprising: an adhesive reinforcing plate having a plurality of anchor through holes along the longitudinal direction; an anchor penetrating hole provided in the adhesive reinforcing plate, A plurality of fixing anchors to be embedded in the holes, a synthetic resin for bonding in a space between the base surface of the reinforced concrete structure and the adhesive reinforcing plate, and the lower end surface is welded to the upper surface of the adhesive reinforcing plate The upper end section includes a load transmission plate welded to the steel structure for seismic retrofitting and a mortar reinforced by the seam reinforced steel structure including the mortar cast in a space between the seam reinforcing plate and the seismic reinforcement steel structure welded with the load transmission plate Bonding structure and joining method. The joint structure and joining method proposed by this patent is based on the assumption that the existing reinforced concrete structure and the reinforced steel structure with the steel plate are installed in the existing reinforced concrete structure so that the existing reinforced concrete structure and the steel structure for earthquake- However, it is disadvantageous that excessive steel material is used in joining existing structure and steel structure and non-economical and non-environmental because mortar casting is necessary for site casting.

Patent No. 10-1060708 'Joining structure and joining method of steel structure for seismic strengthening'

SUMMARY OF THE INVENTION The object of the present invention is to propose a method of minimizing damage to existing buildings having a considerable brittle ductility, .

Another object of the present invention is to provide a reinforcement device capable of improving the structural stability and workability of the joint between the RC structure of an existing building and a steel member as a reinforcing member and thereby increasing the structural strength of the existing structure economically and widely. .

In particular, in the case of the school building, it is possible to prevent the brittle fracture caused by the effect of the crossing due to the back wall in the case of the pillar member, and to reinforce the strength of many pillars and beams over the long length by the long side. The present invention provides a reinforcement method and a reinforcement device capable of freely adjusting the degree of bending moment imposed by the bending moment and minimizing the basic reinforcement.

A method of seismic retrofitting of a conventional reinforced concrete moment frame structure according to a preferred embodiment of the present invention includes roughly treating the exposed surface of a structural member to be reinforced of a conventional reinforced concrete moment frame structure; A pair of longitudinal members arranged parallel to each other at a predetermined interval in parallel with each other and spaced apart from each other at regular intervals and in a direction perpendicular to the longitudinal members so as to connect the pair of longitudinal members Fixing a connecting member including a plurality of transverse members to the exposed surface of the roughened reinforcing structural member in the direction of reclamation of the reinforcing structural member; Joining a permanent mold having a U-shaped cross-sectional shape to the connecting member so as to cover the exposed surface of the reinforcing structural member while forming a space for inserting a filler material between the exposed surface of the reinforcing structural member and the exposed surface; And placing the filler material in the space between the exposed surface of the structural member to be reinforced and the permanent mold.

At this time, the connecting member is composed of a base plate bonded to the exposed surface of the structural member and a fixed plate vertically extending from one end of the base plate, a pair of longitudinal members having an L-shaped cross-sectional shape and a transverse member of the band- , And the permanent form is composed of a U-shaped cross section including both side wall plates vertically extending from both ends of the bottom plate and the bottom plate, so that both side wall plates are brought into contact with the outer surface of the longitudinal member fixing plate.

Alternatively, the connecting member may include a first horizontal plate joined to the exposed surface of the structural member, a vertical plate extending vertically at one end of the first horizontal plate, and a second vertical plate extending from one end of the vertical plate in a direction opposite to the first horizontal plate. The second horizontal plate extending parallel to the flat plate is constituted by a pair of longitudinal members having a Z-shaped cross-section and a transverse member of a strip-shaped steel plate, and the permanent formwork is vertically extended at both ends of the bottom plate and the bottom plate A U-shaped cross-sectional shape including a joint plate extending horizontally from the end of both side wall plates and both side wall plates to extend horizontally outwardly from the bottom plate so that the joining plate of the permanent formwork abuts on the upper surface of the second horizontal plate of the longitudinal member Can be combined.

On the other hand, the structural member to be reinforced may be a column member or a beam member, and the existing reinforced concrete moment frame structure to be reinforced may be a long-length school building.

A method of seismic retrofitting of a conventional reinforced concrete moment frame structure according to a preferred embodiment of the present invention includes roughing the exposed surface of the reinforced concrete moment frame structure to the column to be reinforced, the beam, the column and the beam; A pair of longitudinal members arranged parallel to each other at a predetermined interval in parallel with each other and spaced apart from each other at regular intervals and in a direction perpendicular to the longitudinal members so as to connect the pair of longitudinal members Fixing a connecting member including a plurality of transverse members in the direction of reclamation of the column to be reinforced on the exposed surface of the roughened column and the joining of the column and the beam; A permanent U shape of the cross section is connected to cover the exposed surface of the column and the beam, excluding the joint between the column and the beam, while forming a space for filling the filler material between the column to be reinforced and the exposed surface of the beam and the connection between the column and the beam. Coupling to the member; Joining a cross-shaped permanent formwork to the connecting member so as to cover the exposed surface of the joint of the column and the beam while forming a space for filling the filler material between the column and the exposed surface of the joint of the beam; And placing the filler material in a space between the exposed surface of the joining portion of the beam to be reinforced and the beam and the column and the beam, and between the permanent mold and the cruciform permanent mold.

Here, the connecting member is composed of a base plate bonded to the exposed surface of the structural member and a fixed plate extending vertically at one end of the base plate, a pair of longitudinal members having an L-shaped cross-sectional shape and a transverse member of the band- , And the permanent form is composed of a U-shaped cross section including both side wall plates vertically extending from both ends of the bottom plate and the bottom plate, so that both side wall plates are brought into contact with the outer surface of the longitudinal member fixing plate.

Alternatively, the connecting member may include a first horizontal plate joined to the exposed surface of the structural member, a vertical plate extending vertically at one end of the first horizontal plate, and a second vertical plate extending from one end of the vertical plate in a direction opposite to the first horizontal plate. The second horizontal plate extending parallel to the flat plate is constituted by a pair of longitudinal members having a Z-shaped cross-section and a transverse member of a strip-shaped steel plate, and the permanent formwork is vertically extended at both ends of the bottom plate and the bottom plate A U-shaped cross-sectional shape including a joint plate extending horizontally from the end of both side wall plates and both side wall plates to extend horizontally outwardly from the bottom plate so that the joining plate of the permanent formwork abuts on the upper surface of the second horizontal plate of the longitudinal member Can be combined.

On the other hand, the existing reinforced concrete moment frame structure to be reinforced can be a long school building.

The reinforced concrete moment frame structure according to a preferred embodiment of the present invention is a reinforced concrete moment frame structure having an exposed surface. The reinforced concrete moment frame structure has a reinforced concrete moment frame structure, And a pair of longitudinal members provided on the exposed surface of the beam in the direction of reclamation of the beam in parallel to each other at regular intervals and in parallel to each other in a direction perpendicular to the longitudinal member, A connecting member including a plurality of transverse members connecting the direction members, and a space for filling the filler material between the exposed surface of the reinforcing column and the beam, excluding the joining portion of the column and the beam, A U-shaped cross-sectional permanent form coupled to the connecting member to cover the column, A cruciform permanent form coupled to the connecting member so as to cover the exposed surface of the joint of the column and the beam while forming a reconditioning space, and a filler insert between the exposed column and the exposed face of the beam and the column and the beam, and between the permanent formwork and the cruciform permanent formwork And a filler poured into the space.

At this time, the connecting member is composed of a base plate bonded to the exposed surface of the structural member and a fixed plate vertically extending from one end of the base plate, a pair of longitudinal members having an L-shaped cross-sectional shape and a transverse member of the band- , And the permanent form is composed of a U-shaped cross section including both side wall plates vertically extending from both ends of the bottom plate and the bottom plate, so that both side wall plates are brought into contact with the outer surface of the longitudinal member fixing plate.

Alternatively, the connecting member may include a first horizontal plate joined to the exposed surface of the structural member, a vertical plate extending vertically at one end of the first horizontal plate, and a second vertical plate extending from one end of the vertical plate in a direction opposite to the first horizontal plate. The second horizontal plate extending parallel to the flat plate is constituted by a pair of longitudinal members having a Z-shaped cross-section and a transverse member of a strip-shaped steel plate, and the permanent formwork is vertically extended at both ends of the bottom plate and the bottom plate A U-shaped cross-sectional shape including a joint plate extending horizontally from the end of both side wall plates and both side wall plates to extend horizontally outwardly from the bottom plate so that the joining plate of the permanent formwork abuts on the upper surface of the second horizontal plate of the longitudinal member Can be combined.

The method and apparatus for reinforcing an existing reinforced concrete moment frame structure according to the present invention can minimize the damage to the interior of the existing reinforced concrete moment frame structure, It is possible to solve the problem that the unreinforced portion is weakened when the seismic load acts relatively and the brittle fracture due to the effect of the stiffening due to the waist wall of the column member can be prevented.

Also, structural members of existing reinforced concrete moment frame structures can be improved economically and widely, and structural stability and workability of joints of existing reinforced concrete structures and steel members, which are reinforcing members, can be improved. As described above, The reinforced members are reinforced by the ability of the anchors bonded to the concrete tanks. However, in the case of the existing methods, excessive reinforcing members exceeding the capabilities of anchors or reinforcing bars are applied, According to the present invention, the cross-sectional size can be freely designed by the structural design so that the design of the new stiffener bonded to the existing reinforced concrete member and the anchor member can be freely designed. Therefore, in the application of the method, And clear the errors of construction It can be changed.

Particularly, the present invention can be reinforced to enhance the strength of a plurality of columns and beams over the entire length in seismic reinforcement of a structure such as a long school by a long side, and the degree of bending moment imposed by the extension of a column section can be freely adjusted So that the basic reinforcement can be minimized.

BRIEF DESCRIPTION OF THE DRAWINGS The accompanying drawings, which are incorporated in and constitute a part of the specification, illustrate exemplary embodiments of the invention and, together with the description, serve to explain the principles of the invention, Shall not be construed as limiting.
FIGS. 1A to 1D are views sequentially illustrating a method of reinforcing an existing reinforced concrete moment frame structure according to an embodiment of the present invention.
FIG. 2A is a view showing a modified example of a connecting member fixing step applied to a seismic retrofitting method of a conventional reinforced concrete moment frame structure according to an embodiment of the present invention, and FIG. 2B is a view showing a modification of the permanent formwork combining step .
FIG. 3 is a perspective view illustrating a reinforced beam using an existing reinforced concrete moment frame structure according to an embodiment of the present invention and a reinforcement device. FIG.
4 is a view showing a method of reinforcing an existing reinforced concrete moment frame structure according to another embodiment of the present invention and a reinforcing apparatus.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in detail below with reference to the embodiments shown in the accompanying drawings, but the present invention is not limited thereto.

The present invention relates to a method and a reinforcing device for reinforcing strength and rigidity, that is, reinforcing strength, by increasing the cross-section of a column and a beam of a conventional reinforced concrete moment frame structure. In the reinforced concrete moment frame structure to which the present invention is applied, A reinforced concrete structure having a sufficient stiffness such that the joining portion of the column can maintain the angle between the initial members. In such a moment frame, lateral forces such as wind and earthquake are mainly resisted by the effect of the stiffening frame, that is, the shear force and bending moment generated at the frame members and joints. Accordingly, the present invention improves the seismic performance by reinforcing the joint between the column and the beam and the frame member, that is, the joint between the column and the beam.

The concrete structure of the reinforcement method is the same as that of the object of the cross-sectional enlargement, that is, the column to be reinforced and the fixed cross-section are the same, so the following description focuses on reinforcing the column and briefly explains how to reinforce the beam do. Next, a method of reinforcing the column and the beam simultaneously including the joint between the column and the beam will be described.

FIGS. 1A to 1D are views sequentially illustrating a method of reinforcing an existing reinforced concrete moment frame structure according to an embodiment of the present invention.

As shown in FIGS. 1A to 1D, an existing reinforced concrete moment frame structure seismic reinforcement method according to an embodiment of the present invention includes an exposed surface 111 of the reinforced concrete moment frame structure 10, ); Securing the connecting member (20) to the exposed surface (111) of the roughened reinforcing object structural member (10); The connecting member 20 is fixed to the permanent mold 10 so as to cover the exposed surface 111 of the reinforcing object structural member 10 while forming the filling material placing space 50 between the exposed surface 111 of the reinforcing structural member 10 and the exposed surface 111 of the reinforcing object structural member 10. [ (40); And placing the filler material 60 in the filler material placement space 50 between the exposed surface 111 of the structural member 10 to be reinforced and the permanent mold 40. [

Hereinafter, each step will be described in more detail with reference to the drawings.

First, as shown in FIG. 1A, the reinforcing object structural member 10 of the existing reinforced concrete moment frame structure, that is, the exposed surface 111 of the column 11 is roughened in this embodiment. The reason for roughening the smooth concrete surface is to improve the adhesion with the filler material 60 placed back. For this purpose, various methods are known for roughening the surface of the concrete. One example is chipping, which makes the surface of the concrete roughen by a tool or a machine. If the finish is installed before roughing the exposed surface, first shake off the finish.

In the drawing, it is illustrated that the cross section is expanded in the direction of the outdoor side exposed surface 111, and only the outdoor side exposed surface 111 is roughened. However, the cross sectional enlargement can be performed in the direction of the indoor side exposed surface 112, Or both of the exposed surfaces, or all of the exposed surface directions, of the exposed surfaces 113 and 114 perpendicular to the exposed surface of the room, and all of the exposed surfaces in the direction of the extended surface are roughened .

Next, as shown in Fig. 1B, the connecting member 20 is fixed to the exposed surface 111 of the roughened object member 10 to be reinforced. The connecting member 20 includes a pair of longitudinal members 21a and 21b provided parallel to each other at regular intervals and in the direction of reclamation of the reinforcing object structural member 10 and a pair of longitudinal members 21a and 21b, 21a, 21b and a plurality of transverse members 22 connecting the pair of longitudinal members 21a, 21b. That is, the connecting member 20 is composed of a pair of longitudinal members 21a and 21b provided in the reclamation direction of the structural object to be reinforced 10 and a plurality of transverse members 22 provided in the direction perpendicular to the reclamation direction . Therefore, the connecting member 20 has a shape similar to a ladder.

The pair of longitudinal members 21a and 21b have the same cross-sectional shape and are fixed to the exposed surface 111 of the reinforcing object structural member 10 symmetrically with respect to each other. In this embodiment, the pair of longitudinal members 21a and 21b are respectively fixed to the base plate 211 joined to the exposed surface 111 of the reinforcing structural member 10 and the permanent mold 40 And the fixing plate 212 has a cross-sectional shape at right angles. That is, the pair of longitudinal members 21a and 21b have an L-shaped sectional shape in which the base plate 211 and the fixing plate 212 are formed at right angles to each other. As the pair of longitudinal members 21a and 21b, an L-shaped steel having such a sectional shape can be applied, or a single steel plate produced by press working or roll forming can be applied.

The distance between the pair of longitudinal members 21a and 21b is determined by the width of the reinforcing structural member 10 and the length is determined by the span of the reinforcing structural member 10. [ The anchor insertion hole 213 through which the anchor bolt 30 for fixing the connecting member 20 to the reinforcing object structural member 10 passes is formed in the base plate 211 of the pair of longitudinal members 20a, They are perforated at regular intervals along the direction.

The transverse member 22 is composed of a strip-shaped steel plate and is joined in parallel to the longitudinal members 21a and 21b in a direction perpendicular to the longitudinal members 21a and 21b to connect the pair of longitudinal members 21a and 21b . That is, the transverse member 22 is bonded between the anchor insertion hole 213 and the anchor insertion hole 213 on the upper surface of the base plate 211 in the direction perpendicular to the longitudinal direction of the longitudinal members 21a and 21b. The method of joining the transverse member 22 to the upper surface of the base plate 211 of the longitudinal members 21a and 21b is preferably welded but a bolt or rivet joint may also be used.

The connecting member 20 constructed as described above is fixed to the rough surface-treated exposed surface 111 of the reinforcing object structural member 10 with the anchor bolt 30 with the same length as the span of the reinforcing object structural member 10 do. That is, the anchor holes are drilled in the reinforcing structural member 10 at the intervals corresponding to the anchor insertion holes 213, and then the reinforced structure member 10 is buried in the anchor holes drilled in the reinforcing structural member 10 through the anchor insertion holes 213 The anchor bolts 30 are fastened to the reinforcing object structural member 10 in a rigid manner. There is no particular limitation on the type of the anchor bolts 30 applied to the present invention, and any post-construction anchor bolts known in the art such as a micanickel anchor and a chemical anchor can be applied.

Next, as shown in Fig. 1C, the exposed surface 111 of the structural object member 10 to be reinforced is formed by forming the filler material installation space 50 between the exposed surface 111 and the exposed surface 111 of the structural object member 10 to be reinforced. The permanent mold 40 is coupled to the connecting member 20 so as to cover it. The permanent mold 40 is manufactured by bending a single steel sheet in a manner such that both side wall plates 42 extending vertically from both ends of the bottom plate 41 and the bottom plate 41 are integrally formed by a press working or a roll forming method . Therefore, the permanent mold 40 has a U-shaped cross-sectional shape of which one side is open, has the same length as the connecting member 20, and has a width corresponding to the distance between the longitudinal members 21a and 21b.

The permanent mold 40 is welded to the outer surface of the fixing plate 212 of the pair of longitudinal members 21a and 21b while the side walls 32 of the permanent mold 40 are in contact with each other And is firmly coupled to the pair of longitudinal members 21a and 21b. Sealing the junction between the permanent mold 40 and the pair of longitudinal members 21a and 21b using an epoxy resin can improve the watertightness performance. Accordingly, a closed filler material installation space 50 is formed between the exposed face 111 of the structural member 10 to be reinforced and the permanent formwork 40, and the permanent formwork 40 is formed of a steel plate concrete composite structure It also functions as a structural member similar to a steel plate which surrounds concrete and is integrally combined with concrete to resist external forces together. On the other hand, since the permanent mold 40 is firmly connected to the structural object member 10 to be reinforced through the anchor bolt 30 and the connecting member 20, a separate ground support is unnecessary.

Finally, as shown in FIG. 1D, the filling material 60 is placed in the filling material placing space 50 between the exposed surface 111 of the reinforcing structural member 10 and the permanent mold 40. As the filler material 60, cement paste, mortar or concrete can be used. When the filler material 60 is cured, the reinforcing object structural member 10, the filler material 60 and the permanent mold 40 are integrated. Therefore, according to the present invention, the reinforcing members of the steel composite concrete structure are integrated with the existing reinforced concrete moment frame structural members, thereby increasing the strength and rigidity of the existing reinforced concrete moment frame structures, thereby enhancing the seismic performance.

The connecting member and the permanent mold applied to the present invention can be modified into various shapes in consideration of workability and economical efficiency. Hereinafter, these modified examples will be described.

FIG. 2A is a view showing a modified example of a connecting member fixing step applied to a seismic retrofitting method of a conventional reinforced concrete moment frame structure according to an embodiment of the present invention, and FIG. 2B is a view showing a modification of the permanent formwork combining step .

Although a pair of longitudinal members 21a and 21b having an L-shaped cross section is applied in the above-described embodiment, a pair of longitudinal members 21c and 21d having a Z-shaped cross section is applied in this variation, So that the cross-sectional shape of the permanent mold 40a is also changed into a U-shaped lapped shape, but the overall construction steps are the same. Therefore, the detailed description of the construction step is omitted below, and the description of the same construction steps as those of the previously described embodiment will be omitted or only the connection member installation step and the permanent mold installation step will be described in detail.

Referring to FIG. 2A, in this modified example, as shown in FIG. 1A, after roughly treating the exposed surface 111 of the structural object member 10 to be reinforced, a pair of longitudinal members 21c And 21d are fixed to the exposed surface 111 of the reinforcing structural member 10 with the anchor bolts 30. [ More specifically, the pair of longitudinal members 21c and 21d each have a first horizontal plate 215 and a second horizontal plate 215 joined to the exposed surface 111 of the structural object to be reinforced 10, A U-shaped permanent die (not shown) extending parallel to the first horizontal plate 215 in a direction opposite to the first horizontal plate 215 at one end of the vertical plate 216 And a second horizontal plate 217 to which the joining plate 43 of the second horizontal plate 40a is joined. Therefore, the pair of longitudinal members 21c and 21d according to the present modification has a Z-shaped cross-sectional shape. As the pair of longitudinal members 21c and 21d, a Z-shaped steel having such a sectional shape can be applied, or a single steel sheet can be produced by press working or roll forming. Anchor insertion holes 213 are formed in the first horizontal plate 215 of the pair of longitudinal members 21c and 21d at regular intervals along the longitudinal direction for engagement with the structural object to be reinforced 10 And a bolt fastening hole 218 is formed in the second horizontal plate 217 at regular intervals for engagement with the U-shaped permanent mold 40a.

The transverse member 22 is composed of a strip-shaped steel plate and is joined to the longitudinal members 21c and 21d in a direction perpendicular to the longitudinal members 21c and 21d at a predetermined distance in the same manner as in the above- 21c, and 21d. That is, the transverse member 22 is bonded between the anchor insertion hole 213 and the anchor insertion hole 213 on the upper surface of the first horizontal plate 215 in the direction perpendicular to the longitudinal direction of the longitudinal members 21c and 21d, do. The method of joining the transverse member 22 to the upper surface of the first horizontal plate 215 of the longitudinal members 21c and 21d is preferably a weld joint, but a bolt or a rivet joint may also be used.

The connecting member 20a configured as described above is fixed to the rough surface-treated exposed surface 111 of the reinforcing object structural member 10 with the anchor bolt 30 with the same length as the span of the reinforcing object structural member 10 do. That is, the anchor holes are drilled in the reinforcing structural member 10 at the intervals corresponding to the anchor insertion holes 213, and then the reinforced structure member 10 is buried in the anchor holes drilled in the reinforcing structural member 10 through the anchor insertion holes 213 The anchor bolts 30 are fastened to the reinforcing object structural member 10 in a rigid manner. There is no particular limitation on the type of the anchor bolts 30 applied to the present invention, and any post-construction anchor bolts known in the art such as a micanickel anchor and a chemical anchor can be applied.

Referring to FIG. 2B, the U-shaped permanent formwork 40a is engaged with the connecting member 20a fixed to the exposed surface 111 of the structural object member 10 to be reinforced. The permanent formwork 40a according to the present modification further includes a joining plate 43 extending horizontally from the end of both side wall plates 42 and 42 of the permanent form 40 do. The permanent formwork 40a according to the present modification also includes a bottom plate 41, a pair of side wall plates 42 extending vertically at both ends of the bottom plate 41, The bottom plate 41 and the joining plate 43 extending horizontally outwardly from the end of the side wall plates 42 and 42 are integrally formed. Therefore, the permanent form 40a has a U-shaped cross-sectional shape of which one side is open, has the same length as the connecting member 20, and has a width corresponding to the distance between the longitudinal members 21a and 21b.

The permanent mold 40a is formed by joining the joining plates 43 of the permanent mold 40a to the upper surface of the second horizontal plate 217 of the pair of longitudinal members 21c and 21d, Thereby being firmly coupled to the pair of longitudinal members 21c and 21d. Accordingly, a closed filler material installation space 50 is formed between the exposed surface 111 of the structural member 10 to be reinforced and the permanent formwork 40a, and the permanent formwork 40a is formed of a steel plate concrete composite structure It also functions as a structural member similar to a steel plate which surrounds concrete and is integrally combined with concrete to resist external forces together. Meanwhile, since the permanent formwork 40a is firmly coupled to the structural member 10 to be reinforced through the anchor bolts 30 and the connecting member 20, a separate ground support is unnecessary.

1D, the filling material 60 is inserted into the filling material placing space 50 between the exposed surface 111 of the reinforcing object structural member 10 and the permanent mold 40a after the permanent mold 40a is installed, . As the filler material 60, cement paste, mortar or concrete can be used. When the filler material 60 is cured, the reinforcing object structural member 10, the filler material 60 and the permanent mold 40a are integrated. Therefore, according to the present invention, the reinforcing members of the steel composite concrete structure are integrated with the existing reinforced concrete moment frame structural members, thereby increasing the strength and rigidity of the existing reinforced concrete moment frame structures, thereby enhancing the seismic performance.

In the above description, the reinforcement structural member 10 is the column 11, but the beam 12 may be reinforced by the same construction step.

FIG. 3 is a perspective view illustrating a reinforced beam using an existing reinforced concrete moment frame structure according to an embodiment of the present invention and a reinforcement device. FIG.

As shown in Fig. 3, when the beam 12 is reinforced, the cross-sectional expansion is made with respect to the outdoor-side exposed surface. Therefore, after the exposed surface of the beam 12 is roughened, the connecting member 20 or 20a is installed in the direction of recoil of the beam 12, the permanent mold 40 or 40a is installed, The filling material 60 may be placed in the filling material placing space 50 between the exposed surface and the permanent mold 40 or 40a. When the filler material 60 is cured, the filler material 60 and the permanent mold 40 or 40a are integrated. Therefore, according to the present invention, reinforcing members of a steel plate concrete composite structure are integrated with existing reinforced concrete moment frame structural members (beams) to increase the strength and rigidity of existing reinforced concrete moment frame structures, thereby improving seismic performance.

The present invention can be applied to reinforcement of individual structural members as described above, and can also be applied to reinforcing a column and a beam member at the same time, including a joint between the column and the beam.

The connection member 20 shown in FIG. 1B or the connection member 20a shown in FIG. 2A may be used as the connection member and the connection member 20 shown in FIG. 1C when the connection member 20 shown in FIG. Permanent form 40 is coupled and permanent form 40a shown in Figure 2b is engaged when connecting member 20a shown in Figure 2a is applied. Hereinafter, a method of reinforcing the connection member 20 shown in FIG. 1B and the permanent mold 40 shown in FIG. 1C will be described.

4 is a view showing a method of reinforcing an existing reinforced concrete moment frame structure according to another embodiment of the present invention and a reinforcing apparatus.

First, as shown in FIG. 4A, the posts 11, which are the structural members to be reinforced, and the beams 12 and their joint exposed surfaces are roughened.

Subsequently, as shown in Fig. 4B, the connecting member 20 shown in Fig. 1B is fixed to the roughened column 11 and the beam 12 and their joint exposed surfaces by means of the anchor bolts 30 .

Subsequently, as shown in Fig. 4C, the column 11 of the remaining part except for the joining part of the column 11 and the beam 12 and the connecting member 20 fixed to the beam 12 Thereby joining the permanent mold 40. Therefore, at this stage, the permanent mold 40 is not installed at the joint between the column 11 and the beam 12, but is exposed in a cross shape.

Next, as shown in FIG. 4D, the cross-shaped permanent mold 40b is joined to the joining portion of the beam 12 and the column 11 to which the permanent mold 40 is not joined. The cross-shaped permanent mold 40b is formed in a cross shape crossing the permanent mold 40 shown in FIG. 1C, and has a sectional shape similar to that of the permanent mold 40 shown in FIG. 1C.

Finally, as shown in FIG. 4E, the filler material 60 is poured into the permanent mold 40 and the cross-shaped permanent mold 40b.

According to this embodiment, reinforcing members of the steel plate concrete composite structure are integrated into the joint between the existing reinforced concrete moment frame structure member and the structural member, thereby increasing the strength and rigidity of the existing reinforced concrete moment frame structure, do.

In the above-described embodiments, the exposed surfaces 111 of the reinforcing structural member 10 are roughened and then the connecting members 20 and 20a are fixed. However, It is also possible to roughly treat the exposed surface 111 after fixing the connecting members 20 and 20a to the exposed surface 111 of the member 10.

As described above, according to the present invention, it is possible to minimize damage to the interior of the existing reinforced concrete moment frame structure, and when the reinforcement is limited to a part of the long side direction due to the high cost of the vibration damper product, It is possible to solve the problem of weakening in operation and to prevent the brittle fracture due to the effect of the crossing due to the waist wall of the column member.

Also, structural members of conventional reinforced concrete moment frame structures can be economically extended to a wide range of strength, and structural stability and workability of joints of reinforced concrete members and reinforcing steel members can be improved.

Also, as mentioned above, the performance of the members reinforced by the anchors' ability to be bonded to the existing reinforced concrete tanks is exerted. In the existing method, by applying an excessive reinforcing member exceeding the anchor or the reinforcing steel, According to the present invention, it is possible to freely design the size of the cross section by the structural design so that the design of the new stiffener joined to the existing reinforced concrete member and the anchor member can be easily designed. In addition, Even in the application of the method, the construction method is simple and clear, so that errors in construction can be minimized.

Particularly, the present invention can reinforce a plurality of pillars and beams so as to enhance the strength of the pillars and the beams over the entire length in the seismic reinforcement of a structure such as a long school by a long side, and can freely adjust the degree of bending moment There is an effect that the basic reinforcement can be minimized.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is evident that many alternatives, modifications and variations will be apparent to those skilled in the art in light of the above teachings. will be. The invention is not limited by these variations and modifications, but is limited only by the claims appended hereto.

10: structural member 111: exposed surface of the structural member
11: Column 12: Beam
20: connecting member 21: longitudinal member
211: base plate 212: fixed plate
213: anchor insertion hole 22: transverse member
30: Anchor bolt 40: Permanent die
50: filler material installation space 60: filler material

Claims (13)

Roughing the exposed surface of the structural member to be reinforced in the existing reinforced concrete moment frame structure;
A pair of longitudinal members arranged parallel to each other at a predetermined interval in parallel with each other and spaced apart from each other at regular intervals and in a direction perpendicular to the longitudinal members so as to connect the pair of longitudinal members Fixing a connecting member including a plurality of transverse members to the exposed surface of the roughened reinforcing structural member in the direction of reclamation of the reinforcing structural member;
Joining a permanent mold having a U-shaped cross-sectional shape to the connecting member so as to cover the exposed surface of the reinforcing structural member while forming a space for inserting a filler material between the exposed surface of the reinforcing structural member and the exposed surface; And
And inserting a filler into the space between the exposed surface of the structural member to be reinforced and the permanent formwork. The method according to claim 1,
The connecting member,
The base plate joined to the exposed surface of the structural member and the fixed plate extending vertically at one end of the base plate are constituted of a pair of longitudinal members having an L-shaped cross-section and a transverse member of the strip-
The permanent mold,
Wherein the reinforcing member is composed of a U-shaped cross section including both side wall plates extending vertically at both ends of the bottom plate and the bottom plate, and both side wall plates are coupled to abut the outer side surface of the longitudinal member fixing plate. Seismic Retrofit Method of Moment Framed Buildings. The method according to claim 1,
The connecting member,
A vertical plate extending vertically from one end of the first horizontal plate, and a second horizontal plate extending parallel to the first horizontal plate in a direction opposite to the first horizontal plate at one end of the vertical plate, And the second horizontal plate is composed of a pair of longitudinal members having a Z-shaped cross-sectional shape and a transverse member of a strip-shaped steel plate,
The permanent mold,
A U-shaped cross-sectional shape including a pair of side wall plates extending vertically at both ends of the bottom plate and the bottom plate, and a joint plate extending horizontally from the end of both side wall plates to the outside in a horizontal direction, Wherein the joint plate of the permanent formwork is brought into abutment with the upper surface of the watertight plate. The method according to claim 1,
Characterized in that the structural member to be reinforced is a column member, and a method of reinforcing the seismic reinforcement of the existing reinforced concrete moment frame structure. The method according to claim 1,
Characterized in that the structural member to be reinforced is a beam member, and a method of reinforcing the existing reinforced concrete moment frame structure. The method according to claim 1,
The reinforced concrete moment frame structure to be reinforced is characterized in that it is a long - length school building, and a method of reinforcing the existing reinforced concrete moment frame structure by the sectional enlargement. A step of roughening the exposed surfaces of the reinforced concrete pillars and beams and columns and beams of the existing reinforced concrete moment frame structure;
A pair of longitudinal members arranged parallel to each other at a predetermined interval in parallel with each other and spaced apart from each other at regular intervals and in a direction perpendicular to the longitudinal members so as to connect the pair of longitudinal members Fixing a connecting member including a plurality of transverse members in the direction of reclamation of the column to be reinforced on the exposed surface of the roughened column and the joining of the column and the beam;
A permanent U shape of the cross section is connected to cover the exposed surface of the column and the beam, excluding the joint between the column and the beam, while forming a space for filling the filler material between the column to be reinforced and the exposed surface of the beam and the connection between the column and the beam. Coupling to the member;
Joining a cross-shaped permanent formwork to the connecting member so as to cover the exposed surface of the joint of the column and the beam while forming a space for filling the filler material between the column and the exposed surface of the joint of the beam; And
And placing a filler material in a space between the exposed face of the joining portion of the beam to be reinforced and the beam and the beam and the permanent formwork and the cruciform permanent formwork in the space for inserting the filler material. The present invention relates to a reinforced concrete moment frame Reinforcement method. 8. The method of claim 7,
The connecting member,
The base plate joined to the exposed surface of the structural member and the fixed plate extending vertically at one end of the base plate are constituted of a pair of longitudinal members having an L-shaped cross-section and a transverse member of the strip-
The permanent mold,
Wherein the reinforcing member is formed of a U-shaped cross section including both side wall plates extending vertically at both ends of the bottom plate and the bottom plate, and both side wall plates are coupled to abut against the outer surface of the longitudinal member fixing plate. Seismic strengthening method of framed structures. 8. The method of claim 7,
The connecting member,
A vertical plate extending vertically from one end of the first horizontal plate, and a second horizontal plate extending parallel to the first horizontal plate in a direction opposite to the first horizontal plate at one end of the vertical plate, And the second horizontal plate is composed of a pair of longitudinal members having a Z-shaped cross-sectional shape and a transverse member of a strip-shaped steel plate,
The permanent mold,
A U-shaped cross-sectional shape including a pair of side wall plates extending vertically at both ends of the bottom plate and the bottom plate, and a joint plate extending horizontally from the end of both side wall plates to the outside in a horizontal direction, Wherein the joint plate of the permanent formwork is brought into abutment with the upper surface of the watertight plate. 8. The method of claim 7,
The reinforced concrete moment frame structure to be reinforced is characterized in that it is a long - length school building, and a method of reinforcing the existing reinforced concrete moment frame structure by the sectional enlargement. In the existing reinforced concrete moment frame structure having exposed surfaces, the columns to be reinforced and the joints of beams, columns and beams,
And a pair of longitudinal members provided on the exposed surface of the beam and the beam in the direction of reclamation of the beam in parallel to each other at regular intervals and in parallel to each other in a direction perpendicular to the longitudinal member A connecting member including a plurality of transverse members connecting the pair of longitudinal members;
A permanent formwork of U-shaped cross-sectional shape joined to the connecting member so as to cover the exposed surface of the column and the beam, excluding the joining portion of the column and the beam, while forming a space for inserting the filler material between the column and the exposed surface of the beam;
A cruciform permanent form coupled to the connecting member so as to cover the exposed surface of the joint of the column and the beam while forming a space for filling the filler material between the column and the exposed surface of the joint of the beam;
And a filler poured into the space for inserting the filler material between the exposed face of the joining portion of the beam to be reinforced and the beam and the permanent formwork and the cruciform permanent form of the beam and an earthquake-reinforcement device for the existing reinforced concrete moment frame structure . 12. The method of claim 11,
The connecting member,
The base plate joined to the exposed surface of the structural member and the fixed plate extending vertically at one end of the base plate are constituted of a pair of longitudinal members having an L-shaped cross-section and a transverse member of the strip-
The permanent mold,
Wherein the reinforcing member is composed of a U-shaped cross section including both side wall plates extending vertically at both ends of the bottom plate and the bottom plate, and both side wall plates are coupled to abut the outer side surface of the longitudinal member fixing plate. Seismic Retrofit of Moment Frame Buildings. 12. The method of claim 11,
The connecting member,
A vertical plate extending vertically from one end of the first horizontal plate, and a second horizontal plate extending parallel to the first horizontal plate in a direction opposite to the first horizontal plate at one end of the vertical plate, And the second horizontal plate is composed of a pair of longitudinal members having a Z-shaped cross-sectional shape and a transverse member of a strip-shaped steel plate,
The permanent mold,
A U-shaped cross-sectional shape including a pair of side wall plates extending vertically at both ends of the bottom plate and the bottom plate, and a joint plate extending horizontally from the end of both side wall plates to the outside in a horizontal direction, Wherein the joint plate of the permanent formwork is brought into abutment with the upper surface of the watertight plate.

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