JP2019011669A - Reinforcement structure and construction method of composite plate - Google Patents

Abstract

To provide a reinforcement structure and a construction method of a composite plate.SOLUTION: The invention is related to a reinforcement structure and a construction method of a composite plate embodied to overcome a strength insuffIciency of a concrete beam utilizing a reinforcement member consisted of aluminium, glass fiber and epoxy material and comprises a flexure reinforcement part with a perforated truss structure formed in a longitudinal direction, a shear reinforcement part extending in a right angle direction from both sides of the flexure reinforcement part and having a first clip member formed in one end and an additional shear reinforcement part having a second clip member capable of being fastened to the first clip member of the shear reinforcement part in one end, and being fastened to a reinforced body with the shear reinforcement part.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a composite plate reinforcing structure and a construction method, and more particularly, to realize a lack of proof strength of a concrete beam using a reinforcing material composed of aluminum, glass fiber, and an epoxy material. The present invention relates to a reinforcing structure of a composite plate and a construction method.

  Most of the basic infrastructure of modern society is formed of reinforced concrete (hereinafter referred to as RC). All RC structures are provided to the user with all mechanics taken into account by the designer in order to fully perform their original functions, with an appropriate safety factor applied depending on the environment and circumstances.

  However, when aging occurs due to structural damage due to unforeseen factors or environmental factors, the original function of the designed structure cannot be performed. After performing a safety diagnosis of the structure so that the original functional range can be secured, repairs are performed. In addition, the structure in use had sufficient strength at the time of design, but if it is necessary to increase the strength of the structure due to additional construction or increased load due to structural changes, it will be reinforced through structural design again. Is done.

  Various repair methods have been used to repair and reinforce RC structures. The material used for the initial repair and reinforcement method is steel. The steel plate reinforcement method is a method of attaching a steel plate to the tensile surface of a concrete structure with epoxy, and since it can be expected to increase the bending strength and rigidity of the RC structure, it has been used for a long time since the 1960s. However, the steel plate reinforcement method has the disadvantages that it is difficult to handle because it uses steel with a large specific gravity, and that its own weight is large. In addition, problems such as adhesion damage to the concrete matrix due to steel corrosion have been raised.

  In the 1980s, when the steel plate reinforcement method was generally used in the field of repair and reinforcement of RC structures, a fiber reinforced polymer (hereinafter referred to as FRP) having excellent mechanical properties, durability and light weight. The FRP reinforcement method to replace the steel plate reinforcement method has been studied.

  The types of FRP include glass fiber, aramid fiber, and carbon fiber, and are used for various reinforcement methods depending on their physical characteristics. FRP has advantages such as strength, light weight, and corrosion resistance compared to other materials, and repair and reinforcement research using FRP is actively progressing.

  RC structures reinforced with FRP have been shown to actually increase flexural strength and increase stiffness significantly. In order to maximize the performance of FRP, which has great advantages as a repair and reinforcement material in this way, and to supplement the disadvantages such as adhesion problems, the FRP sheet method, FRP plate method, FRP The NSM (near surface mounted) method has been developed and used.

  Aged RC structures or RC structures that require reinforcement are improved in strength through the methods listed above, and such methods are used for repairing and reinforcing bridges and buildings. . However, there are still issues to be solved.

  In Patent Document 1, it is possible to increase the rigidity of facilities by applying a pre-flex construction method which is generally verified and has a simple principle, so that safety can be ensured and the service life can be increased. Although the concrete structure reinforcement device is described, the contact portion that comes into contact with the central portion of the lower surface of the area to be reinforced of the concrete structure that forms the floor of the bridge is provided at the center portion so as to protrude from both ends. Including a reinforcing material and a fastening means for fastening the reinforcing material to a lower part of a region to be reinforced of the concrete structure, and configured to correct and reinforce the bending of the concrete structure. Features. According to the described technique, the reinforcement is applied to the central part of the region to be reinforced of the concrete structure so that the central projecting part is in contact with each other and both ends are separated from each other, and the preflex force is applied by tightening. Therefore, it has the effect of improving the efficiency of repair and reinforcement work, and the structure and the reinforcing material distribute the load appropriately when dead load or live load is applied to the structure immediately after reinforcement by the preflex method. The rigidity and durability of the structure can be greatly increased.

  Patent Document 2 discloses a concrete structure reinforcement that further improves the structural strength and tensile strength of a constructed concrete structure by allowing the bent portions on both sides to clearly exhibit an anchor function in the concrete structure. For steel fibers. According to the described technique, in the center, there is a body portion that is formed to extend horizontally in a straight line, and each of the body portions has inclined bent portions on both sides, and the horizontal end that is bent horizontally again at the end of the inclined bent portion. In the case where the bent parts on both sides have a length ratio of a horizontal end parallel to the trunk part to an inclined folded part inclined from the trunk part, the length ratio is 1: 1. .1 to 1: 1.2.

  The steel plate reinforcement method used in the conventional concrete reinforcement structure as described above is a method in which a steel plate is attached to the tensile surface of a concrete structure using epoxy, and the bending strength and rigidity of the RC structure are enhanced. It has been used for a long time since the 1960s, but it is difficult to handle due to the use of steel with a large specific gravity, and it has the disadvantage of its own weight, as well as adhesion damage to the concrete matrix due to steel corrosion. It was raised as a problem.

Korean registered utility model No. 20-0182826 Korean Registered Patent No. 10-0259927

  One aspect of the present invention is a composite plate reinforcement structure that is implemented to overcome a lack of strength of concrete beams by providing a clip-type fastening portion using a reinforcing material composed of aluminum, glass fiber, and an epoxy material. And a construction method.

  The technical problem of the present invention is not limited to the technical problem mentioned above, and other technical problems that are not mentioned should be clearly understood by those skilled in the art from the following description.

  A reinforcing structure of a composite plate according to an embodiment of the present invention includes a bending reinforcing portion in which a perforated truss structure is formed in a length direction; the bending reinforcing portion is extended in a right angle direction from both sides of the bending reinforcing portion; A shear reinforcing portion having a first clip member formed at one end; and a second clip member that can be fastened to the first clip member of the shear reinforcing portion at one end, and being fastened to the reinforced body together with the shear reinforcing portion Includes shear reinforcement.

  In one embodiment, the first clip member may be formed in a U shape that is bent inward from one end of the shear reinforcement portion.

  In one embodiment, the second clip member may be formed in a U shape that is bent outward from one end of the additional shear reinforcement.

  In one embodiment, the second clip member may be inserted into the inverted U-shaped groove of the first clip member, inserted into a clip shape, and meshed.

  In one embodiment, a portion of the shear reinforcement portion where the first clip member and the second clip member are engaged with each other can be fastened together.

  In one embodiment, the shear reinforcement portion may seal an open portion on one side and then fill the other side with an adhesive between the reinforcement target.

  In one embodiment, the perforated truss structure may be formed integrally or detachably below the bending reinforcement portion.

  The reinforcing structure of the composite plate according to another embodiment of the present invention includes a plurality of layers formed of glass fiber reinforced plastic (GFRP) on the surface of the bending reinforcing portion. An additional bending reinforcement for replenishing can be further included.

  A method for reinforcing a composite plate according to still another embodiment of the present invention includes a step of applying an adhesive to an upper portion of a bending reinforcing portion or a reinforcing member requiring reinforcement; attaching the bending reinforcing portion to the reinforcing member. And a step of fastening a shear reinforcement portion extended in a perpendicular direction on both sides of the bending reinforcement portion together with the additional shear reinforcement portion to the reinforced body.

  In one embodiment, the step of coupling the shear reinforcement portion includes the step of sealing an open part on one side of the shear reinforcement portion; the shear reinforcement portion and the reinforced body on the other side of the shear reinforcement portion. Filling the space between the adhesive; sliding insertion of the additional shear reinforcement on the other side of the shear reinforcement, and a first clip member of the shear reinforcement and a second clip member of the additional shear reinforcement; And fastening the portion in which the first clip member and the second clip member are engaged with each other to be reinforced.

  According to one aspect of the present invention described above, a composite plate embodied to overcome a lack of proof strength of a concrete beam by providing a clip-type fastening portion using a reinforcing material composed of aluminum, glass fiber, and an epoxy material. By providing the reinforcing structure and construction method, it has the effect of increasing the strength and rigidity of the RC beam and complementing the disadvantages of existing reinforcement methods such as air permeability, early dropout or construction.

The figure explaining the reinforcement structure of the composite plate which concerns on one Example of this invention. The figure explaining the reinforcement structure of the composite plate which concerns on one Example of this invention. Drawing explaining the fastening structure of a shear reinforcement part and an additional shear reinforcement part. The figure which showed the reinforcement part and shear reinforcement part in FIG. The flowchart explaining the construction method of the composite plate structure which concerns on the other Example of this invention. The flowchart explaining the step which couple | bonds the shear reinforcement part in FIG. The figure which showed the test body for evaluating the effect of the reinforcement structure of the composite plate which concerns on this invention. The figure which showed the test body for evaluating the effect of the reinforcement structure of the composite plate which concerns on this invention. It is the graph which showed the load-displacement relationship of the to-be-reinforced body reinforced by this invention, and the to-be-reinforced body which is not reinforced.

  The following detailed description of the invention refers to the accompanying drawings that illustrate, by way of illustration, specific embodiments in which the invention may be practiced. These embodiments are described in sufficient detail to enable those skilled in the art to practice the invention. It should be understood that the various embodiments of the present invention are different from each other but need not be mutually exclusive. For example, the specific shapes, structures, and characteristics described herein may be embodied in other embodiments without departing from the spirit and scope of the invention in connection with one embodiment. It should also be understood that the position or arrangement of individual components within each disclosed embodiment may be changed without departing from the spirit and scope of the invention. The following detailed description is, therefore, not to be taken in a limiting sense, and the scope of the present invention is limited only by the appended claims, along with the full scope of claims to be claimed. . Like reference numerals in the drawings denote the same or similar functions throughout the various aspects.

  Hereinafter, preferred embodiments of the present invention will be described in more detail with reference to the drawings.

  1 to 2 are diagrams illustrating a reinforcing structure of a composite plate according to an embodiment of the present invention.

  Specifically, the composite plate reinforcement structure according to an embodiment of the present invention includes a bending reinforcement part 100, a shear reinforcement part 200, and an additional shear reinforcement part 300.

  A perforated truss structure 110 is formed in the lengthwise direction of the bending reinforcing portion 100, and shear reinforcing portions 200 are respectively formed in the upper right direction from both sides, and adhere to the reinforced body to reinforce the bending of the reinforced body. At this time, the to-be-reinforced body refers to a reinforced concrete structure that forms the basis of most infrastructure in modern society, but is not limited to reinforced concrete, and may be other structures that require reinforcement.

  In one embodiment, the bending reinforcing portion 100 is applied to the adherend after applying an adhesive to the surface facing the reinforced body or applying an adhesive to the attachment surface of the reinforced body to which the bending reinforcing portion 100 is attached. By being attached, the bending of the adherend can be reinforced.

  In one embodiment, the bending reinforcing part 100 can provide an effect of improving rigidity while reducing its own weight by forming a perforated truss structure.

  The shear reinforcement part 200 is formed to extend from both sides of the bending reinforcement part 100 in a right angle direction, and a first clip member 210 is formed at one end to shear and reinforce the object to be reinforced.

  In one embodiment, the shear reinforcement portion 200 is integrally formed with the bending reinforcement portion 100 and is formed of an aluminum material, so that the strength is lighter than the steel material, but it is lighter, thus improving the handling and workability of the reinforcement material. be able to.

  The additional shear reinforcement part 300 includes a second clip member 310 that can be fastened to the first clip member 210 of the shear reinforcement part 200 at one end, and is reinforced by fastening means (for example, a bolt, an anchor bolt, etc.) together with the shear reinforcement part 200. The body to be reinforced is shear-reinforced with the shear reinforcement portion 200 together with the body.

  The composite plate reinforcing structure having the above-described structure is an extrusion process using a mold by using a bending reinforcing part 100, a shear reinforcing part 200, and an additional shear reinforcing part 300 made of aluminum (AL 6063-T5). Can be produced. At this time, AL 6063-T5 is excellent in moldability and corrosion resistance. Therefore, the bending reinforcing portion 100, the shear reinforcing portion 200, and the additional shear reinforcing portion 300 manufactured by AL 6063-T5 are used for the rigidity of the concrete structure. It can contribute to strength, bending rigidity, and yield strength.

  As shown in the cross-sectional view of FIG. 4, the composite plate reinforcing structure having the above-described configuration is different from the existing reinforcing material in that the shear reinforcing portion 200 is extended vertically at both ends of the bending reinforcing portion 100. As a result, the end portion of the reinforcing member can be removed and the adhesion performance can be improved.

  The composite plate reinforcement structure having the above-described configuration is formed by attaching the end portions of the reinforced body so as to wrap the ends of the reinforced body with the shear reinforcement parts 200 on both sides for fixing to the reinforced body. Since the adhesion performance by the frictional shear with the concrete base material which is the reinforcement body and the breaking phenomenon such as the corner peeling of the shear reinforcement portion 200 due to the stress concentration phenomenon are prevented, the reinforcement performance can be improved.

  The composite plate reinforcement structure having the above-described structure is realized by using a reinforcing material composed of aluminum, glass fiber and epoxy material to provide a clip-type fastening part to overcome the lack of strength of concrete beams. By doing so, it is possible to increase the strength and rigidity of the RC beam and to complement the disadvantages of the existing reinforcement method such as air permeability, early dropout or workability, and to reinforce both bending and shear strength.

  FIG. 2 is a perspective view of the reinforcing structure of the composite plate according to the embodiment of the present invention.

  Referring to FIG. 2, in the bending reinforcement portion 100, two perforated truss structures 110-1 and 110-2 are formed in the length direction, but the perforated truss structures are not limited to the corresponding number. Three or more perforated truss structures may be formed.

  In one embodiment, the perforated truss structure 110 is shown integrally in the lower part of the bending reinforcing portion 100 in the case of FIGS. 1 to 3, but it can be attached and detached as required, such as fastening means or adhesive means. May be formed.

  FIG. 3 is a view for explaining a fastening structure of the shear reinforcement portion and the additional shear reinforcement portion.

  Referring to FIG. 3, the first clip member 210 is formed in an inverted U shape that is bent inward from one end of the shear reinforcing portion 200 (that is, the upper end of the shear reinforcing portion 200), and is bent inward. A portion bent outside the second clip member 310 is inserted into the space.

  The second clip member 310 is formed in a U shape that is bent outward from one end of the additional shear reinforcement portion 300 (that is, the lower end of the additional shear reinforcement portion 300), and the portion bent outward is the first clip member 210. Is inserted into a space formed by being bent inside.

  In one embodiment, the second clip member 310 may be inserted into the inverted U-shaped groove of the first clip member 210 and inserted into the clip shape as shown in FIG.

  In one embodiment, the portion where the first clip member 210 and the second clip member 310 are engaged with each other in the shear reinforcement portion 200 can be fastened together with the member to be reinforced by fastening means (for example, bolts, anchor bolts, etc.).

  In one embodiment, since the shear reinforcement portion 200 is attached to the reinforced body even when the reinforced body does not have a separate fastening means, the open portion on one side is sealed and then the other side is covered. An adhesive can be filled between the reinforcing body (see FIG. 1).

  The composite plate reinforcing structure having the above-described configuration may further include an additional bending reinforcing portion 400.

  The additional bending reinforcement 400 replenishes the reinforcing force by cross-laminating multiple layers formed of glass fiber reinforced plastic (GFRP) on the surfaces of the bending reinforcement 100, the shear reinforcement 200, and the additional shear reinforcement 300. (See FIG. 4). At this time, when the fiber arrangement is unidirectional, if the force acts in a direction different from the fiber arrangement direction due to eccentricity or the like, the fiber arrangement is disturbed and the hybrid material cannot exhibit all the structural performance. When the reinforcing layer has a multi-directional fiber arrangement pattern that is not unidirectional, the structural performance of the hybrid material can be fully exhibited, and the required mechanical properties can be realized.

  In one embodiment, the additional bending reinforcement 400 may reduce shear friction due to non-adhesion with the reinforced concrete structure together with the bending reinforcement 100, the shear reinforcement 200, and the additional shear reinforcement 300 having a relatively low elastic modulus. As a result, the synthesis behavior can be induced.

  Although the aluminum used in the bending reinforcement part 100, the shear reinforcement part 200, and the additional shear reinforcement part 300 of the present invention has a lower strength than a steel material, it is light and can improve the handling and workability of the reinforcement material. The additional bending reinforcement portion 400 formed of fibers serves to relatively reinforce low-strength aluminum and wraps around the bending reinforcement portion 100, thereby improving corrosion prevention and durability. In addition, aluminum and glass fiber having a lower elastic modulus than the reinforcing material used in the existing construction method can reduce the shear friction due to non-adhesion with the RC structure, and thus can induce a synthetic behavior.

  FIG. 5 is a flowchart for explaining a construction method of a composite plate structure according to another embodiment of the present invention.

  Referring to FIG. 5, first, an adhesive is applied to the upper portion of the bending reinforcing portion 100 or a to-be-reinforced body that needs reinforcement (S510).

  In one embodiment, the adhesive applied to the reinforced body is an epoxy adhesive (a thermosetting resin based adhesive based on epoxy resin, curing agent, filler, diluent, etc. and other additives) In addition, it has excellent mechanical properties after curing, strong adhesion, excellent heat resistance and electrical insulation properties).

  When the adhesive is applied in the above-described step S510, the bending reinforcement portion 100 is attached to the reinforced body as shown in FIG. 1 (S520).

  When the bending reinforcement part 100 is attached in the above-described step S520, the shear reinforcement part 200 extended at right angles on both sides of the bending reinforcement part 100 is fastened to the reinforced body together with the additional shear reinforcement part 300 (S530).

  The construction method of the composite plate structure having the steps as described above includes a grinding operation for the surface of the reinforced body reinforced by the present invention before the above-described step S510, an operation for removing the finished mortar of the reinforced body, The method may further include performing a pretreatment process for performing one or more of a repair work for a crack in the reinforcing body and a work for flattening the uneven surface of the reinforced body. Moreover, a primer can be apply | coated to a to-be-reinforced body after performing a corresponding pre-processing process.

  By performing the pretreatment process as described above and applying the primer, the adhesion force between the reinforced body and the bending reinforcement portion 100 can be increased.

FIG. 6 is a flowchart for explaining the step of joining the shear reinforcement portions in FIG.

  Referring to FIG. 6, the open part on one side of the shear reinforcement 200 is sealed (S531). In other words, the one side of the shear reinforcement portion 200 is not a space between the object to be reinforced and the shear reinforcement portion 200 in close contact with each other, but a space only for fastening the first clip member 210 and the second clip member 310. (Refer to FIG. 1 to FIG. 3), by sealing the corresponding gap, the adhesive filled from the other side is prevented from flowing out through the corresponding gap.

  When the sealing is performed in step S531, the adhesive is filled in the space between the shear reinforcement portion 200 and the body to be reinforced on the other side of the shear reinforcement portion 200 (S532).

  When the adhesive is filled in step S532 described above, the additional shear reinforcement portion 300 is slidingly inserted on the other side of the shear reinforcement portion 200, and the first clip member 210 and the second clip member 310 are engaged in a clip shape. (S533). That is, as shown in FIG. 3, after adjusting the additional shear reinforcement 300 so that the first clip member 210 and the second clip member 310 are engaged in a clip shape, the second clip member 310 is moved to the first clip. The additional shear reinforcement 300 is fastened to the shear reinforcement 200 as shown in FIG. 2 by sliding and inserting the additional shear reinforcement 300 so that it can be inserted in the lengthwise direction while being engaged with the member 210. Like that.

  When the clip is fastened in the above-described step S533, the portion where the first clip member 210 and the second clip member 310 are engaged with each other is fastened using a fastening means (for example, an anchor bolt) as shown in FIG. It fastens with a to-be-reinforced body (S534).

  7 to 9 are drawings for explaining experiments for evaluating the effect of the composite plate reinforcing structure according to the embodiment of the present invention.

  A test body for evaluating the effect of the reinforcing structure of the composite plate according to the present invention was generated, and the state of destruction of the reinforced body to which the present invention was not applied was tested. FIG. 9 is a graph showing a load-displacement relationship between a reinforced body reinforced by the present invention and an unreinforced reinforced body.

  First, in order to verify the bending and shear reinforcement ability of the reinforcing structure of the composite plate according to the present invention, an RC beam was manufactured and subjected to bending and shearing experiments after being reinforced with the present invention. The behavioral characteristics of the experimental body reinforced and unreinforced with the present invention were experimentally compared and analyzed through various variable analyses, and the reliability of the experiment was confirmed through a general-purpose structural design program. The behavior of the reinforced structure was predicted.

  First, referring to FIGS. 7 and 8, in order to confirm the bending reinforcement effect of the beam reinforced with the BE-2 of the present invention, a total of three experimental bodies including the reference experimental body B-U were manufactured. The details of the size of the experimental body and the reinforcing bar arrangement are shown in FIG.

  FIG. 7 shows a simplified representation of the experimental method. The load applied to all the experimental bodies was unloaded at a distance of 300 mm on both sides from the center of the experimental bodies, and displacement control was performed until the experimental bodies were broken at a speed of 0.02 mm / sec. Two LVDTs (linear variable transformers) for measuring the displacement of the experimental body were installed at the front and back under the center of the experimental body. In addition, during the bending fracture experiment, two strain gauges were attached to the center of the reinforcing bar, and seven strain gauges were attached to the perforated truss composite plate reinforcement to investigate the behavior of each material. . All data were measured using a data logger to measure the sag at the center of the experimental body and the deformation rate of the reinforcing bar and perforated truss composite plate by load stage until the experiment was completed. In addition, the initial crack and crack progress of the experimental body, the drop and breakage of the perforated truss composite plate reinforcement were observed and recorded with the naked eye, and the cracks that occurred at each load stage were recorded on the surface of the member. A crack degree was created after the experiment.

  The B-U experimental body, which is a comparative experimental body, is an RC beam not reinforced by the present invention, and the mechanical mechanism is a system that resists bending by combining the compressive force of concrete and the tensile force of reinforcing bars. It was designed with the ratio of under-reinforcing bars where the tensile rebar yields first in the force balance relationship. As a result of the unloading experiment of the reference experimental body, bending fracture due to the yield of reinforcing bar tension, which is consistent with the design intention, appeared. Bending cracks occurred in the middle of the unloading section in the middle of the experiment, and cracks occurred from the center toward both fulcrums as the load increased. The load did not increase so much as the reinforcing bar yielded after the load continued to increase. The drooping of the center of the experimental body occurred greatly, and the experiment ended with the compression failure of the concrete.

  Referring to FIG. 9, the structural behavior of the experimental body reinforced by the present invention is a system that resists bending by applying the tensile force of the present invention in addition to the compressive force of the concrete and the tensile force of the reinforcing bar. . Since the tensile force is greater than that of the unreinforced experimental body, an increase in bending strength and rigidity can be induced, and cracks in the concrete tensile portion can be suppressed.

  In addition, in the fracture mode that appears in the experimental body reinforced by bending according to the present invention, when the load unloading starts, the hybrid material beam and the tensile reinforcing bar simultaneously receive a tensile force. When an arbitrary load is reached, the reinforcing bar yields first, and then a large amount of load is received by the perforated truss composite plate reinforcement, causing breakage in the maximum bending section.

  The RC beam reinforced with the present invention had bending cracks that developed and progressed as the displacement increased from the center, and the final failure was terminated by the failure of the compression part due to the slip between the main reinforcing bar and the concrete. Yes, it is judged that the adhesion between the reinforcing material and the concrete is sufficient.

  It can be seen that the cracks in the reference experimental body are more widely distributed when the cracks in the reference experimental body B-U and the cracks in the bending reinforcement experimental body BE-2 are observed. It can be judged that this is because the experimental body reinforced by the present invention suppresses cracks and prevents the development of cracks. Moreover, until the experiment was completed, the breakage of the present invention as a reinforcing material and separation from the RC beam did not occur.

  Referring to FIG. 9, it was found that the initial crack load, rigidity, and maximum load of the experimental body reinforced with the present invention were increased with reference to the standard experimental body B-U. The initial crack load of the B-U reference experimental body was 11.6 kN, and the reinforcement experimental body was 18.1 kN. This is judged that the present invention suppresses the initial crack by being reinforced by the tensile portion of the concrete. The rigidity of the reference experimental body and the reinforced experimental body was not significantly different before the initial crack was generated. However, the difference in stiffness after the initial crack was shown, and it was found that the maximum load was greatly increased compared to the reference experimental body B-U. Moreover, since the soft section behaves more greatly by yielding at a higher load than the reference experimental body, a bending reinforcement effect can be expected.

  As a result, in the present invention, a perforated truss composite plate reinforcing material made of two materials was attached to a tensile portion of an RC beam to reinforce bending and shear strength and rigidity, and a bending fracture experiment was performed. In order to analyze the bending characteristics of the experimental body reinforced with, we examined the fracture mode, the appearance of cracks in the experimental body, the effect on experimental variables, and the deformation characteristics of the perforated truss composite plate reinforcement. And the following conclusion was able to be obtained.

  First, both the rigidity and the maximum load of the experimental body reinforced by the present invention increased compared to the reference experimental body that was not reinforced. The beam reinforcement experimental body showed a maximum load increase rate of about 32.4% to 86.2%, and the soft reinforcement performance increased by about 30%. Therefore, it is judged that the reinforcement performance of the present invention is excellent.

  In addition, when considering the effect of reinforcement through the strength, displacement and cracking of the experimental body, the reinforcement according to the present invention is efficient, and the end vertical plate is installed to prevent the corner of the concrete matrix from peeling off and to improve the adhesion performance. It can be seen that is more effective for reinforcing the structure.

  Although the present invention has been described with reference to the embodiments, those skilled in the art can make various modifications to the present invention without departing from the spirit and scope of the present invention described in the following claims. It should be understood that it can be changed.

100: bending reinforcement part 200: shear reinforcement part 210: first clip member 300: additional shear reinforcement part 310: second clip member 400: additional bending reinforcement part

Claims (15)

Bending reinforcement part in which a perforated truss structure is formed in the length direction;
A shear reinforcement portion which is formed to extend in a right angle direction from both sides of the bending reinforcement portion, and a first clip member is formed at one end;
A second clip member that can be fastened to the first clip member of the shear reinforcement portion at one end, and an additional shear reinforcement portion fastened to the reinforced body together with the shear reinforcement portion;
Composite plate reinforcement structure including   2. The composite plate reinforcement structure according to claim 1, wherein the first clip member is formed in an inverted U shape bent inward from one end of the shear reinforcement portion. 3.   3. The composite plate reinforcement structure according to claim 2, wherein the second clip member is formed in a U-shape bent outward from one end of the additional shear reinforcement portion.   4. The composite plate reinforcing structure according to claim 3, wherein the second clip member is inserted into an inverted U-shaped groove of the first clip member, inserted into a clip shape, and meshed. 5.   5. The composite plate reinforcement structure according to claim 4, wherein the shear reinforcement portion is fastened together with a to-be-reinforced portion at a portion where the first clip member and the second clip member mesh with each other.   6. The composite plate according to claim 5, wherein the shear reinforcing portion includes fastening means for fastening a portion where the first clip member and the second clip member are engaged together with a to-be-reinforced body. Reinforcement structure.   The composite plate reinforcing structure according to claim 1, wherein the shear reinforcing portion seals an open portion on one side and then fills the other side with an adhesive between the reinforcing member and the reinforcing member. .   The composite plate reinforcing structure according to claim 1, wherein the perforated truss structure is formed integrally or detachably at a lower portion of the bending reinforcing portion.   2. The composite plate reinforcing structure according to claim 1, wherein the bending reinforcing portion, the shear reinforcing portion, and the additional shear reinforcing portion are made of aluminum.   The reinforcing structure of a composite plate according to claim 1, further comprising an additional bending reinforcing part for laminating glass fiber reinforced plastic (GFRP) on the surface of the bending reinforcing part to supplement the reinforcing force.   The composite plate reinforcing structure according to claim 10, wherein the additional bending reinforcing portion includes a plurality of layers formed of GFRP cross-laminated. A step of applying an adhesive to an upper portion of the bending reinforcing portion or a reinforcing member requiring reinforcement; a step of attaching the bending reinforcing portion to the reinforcing member; and shear reinforcement formed to extend at right angles on both sides of the bending reinforcing portion. Fastening the part to the reinforced body together with the additional shear reinforcement part;
Construction method of composite plate structure including   Before the step of applying the adhesive, the grinding work on the surface of the reinforced body, the work of removing the finishing mortar of the reinforced body, the repair work for cracks in the reinforced body, or the uneven surface of the reinforced body is flattened. The method for constructing a composite plate structure according to claim 12, further comprising a pretreatment step of performing one or more of the operations to be performed.   The construction method of a composite plate structure according to claim 13, further comprising a step of applying a primer to the object to be reinforced after performing the pretreatment step. The step of joining the shear reinforcements comprises
Sealing the open part on one side of the shear reinforcement;
Filling the space between the shear reinforcement portion and the reinforced body on the other side of the shear reinforcement portion with an adhesive;
The additional shear reinforcement portion is slidingly inserted on the other side of the shear reinforcement portion and fastened so that the first clip member of the shear reinforcement portion and the second clip member of the additional shear reinforcement portion are engaged in a clip shape. Steps,
The method for constructing a composite plate structure according to claim 12, further comprising a step of fastening a portion where the first clip member and the second clip member are engaged with each other to be reinforced.

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