JP2020066847A - Reinforcement structure of building - Google Patents

Abstract

To provide a reinforcement structure of a building causing no restriction of installation due to the shape of an existing column, and allowing easy application of a force from a brace to an appropriate position.SOLUTION: The reinforcement structure for a building 1 having a roughly rectangular opening 12 in front view surrounded by columns 2, 2 facing each other with a space, an upper beam 3 bridged between the upper ends of the columns and a floor 11, comprises, in the opening, a pair of auxiliary columns 4, 4 adjacently arranged in a non-jointed state to each of the columns and set between the upper beam and the floor, an upper board part 6 extended from upper ends of the respective auxiliary columns with an upper face 6a jointed to a lower face 3a of the upper beam by an adhesive, a lower board part 7 extended from lower ends of the respective auxiliary columns, with a lower face 7a jointed to an upper face 11a of the floor with the adhesive, and braces 5 with end parts thereof connected to corner parts of upper ends of the auxiliary columns and the upper board part.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a reinforcing structure for a building having an opening that is substantially rectangular in a front view and is surrounded by a pillar that is spaced apart from each other and an upper beam that is bridged between the pillar upper ends and a base surface portion.

  When steel-framed buildings such as factories are to be seismically reinforced with steel braces, the method of field welding gusset plates to existing pillars and beams is generally adopted, but since the factory often dislikes the fire that occurs during welding work, Curing will be a big deal.

  Further, in recent years, a shortage of skilled workers such as welders has become a social problem. Furthermore, the structural members of old buildings that require seismic reinforcement are not only full-filled types such as H-section steel, but also non-full-filled types that are assembled from angle steel and flat steel, and gusset plates are welded. When doing so, it may be necessary to partially replace existing structural members.

  On the other hand, as a seismic strengthening method that does not require welding work, as disclosed in Patent Document 1, a gusset plate that connects the ends of braces that serve as a reinforcing member is attached to the surface of a pillar or beam by an adhesive. There is known a reinforcing method for adhering to.

JP, 2013-177797, A

  However, in the reinforcing method of the frame structure disclosed in Patent Document 1, since the attachment surface of the gusset plate for brace connection is limited to a flat portion, it is applied to the above-mentioned non-filling column material and beam material. In such a case, an unevenness adjusting material or the like for filling the step due to the rivet or the head of the bolt is required, which complicates the design and construction.

  In addition, when the brace is attached to the pillar material, the force of the brace acts at a position eccentric from the centroid of the pillar-beam joint, so an additional bending moment may be generated, and reinforcement may have to be increased. is there.

  Therefore, an object of the present invention is to provide a building reinforcement structure in which the installation is not restricted by the shape of an existing pillar and the force from the brace can be easily applied to an appropriate position. I am trying.

  In order to achieve the above-mentioned object, the reinforcing structure of the building of the present invention has an opening of a substantially rectangular shape in a front view, which is surrounded by a column facing each other with a gap and an upper beam spanned between the upper ends of the columns and a base portion. A reinforcing structure for a building having, wherein a pair of auxiliary pillar portions are arranged adjacent to each other in the opening in a non-joint state and are interposed between the upper beam and the base surface portion. An upper extending portion extending from each upper end portion of the auxiliary pillar portion and having an upper surface joined to a lower surface of the upper beam by an adhesive; and an upper extending portion extending from each lower end portion of the auxiliary pillar portion to form a lower surface. Is provided with a lower extending portion joined to the upper surface of the base portion by an adhesive, and a brace portion having an end portion connected to a corner portion of at least the upper end portion of the auxiliary column portion and the upper extending portion. Is characterized by.

  Here, at least one of the upper extending portion and the lower extending portion may be continuously provided between the auxiliary column portions. Further, the upper extending portion may be a beam portion bridged between the auxiliary column portions.

  Further, the end portion of the brace portion may be bolted to a gusset plate attached to the corner portion. In addition, shear reinforcements may be provided at both ends of the upper beam.

  The pair of auxiliary pillar portions, the upper extending portion, the lower extending portion, and the brace portion may be configured by a plurality of units or members, and the units or members may be bolted to each other. .

  In the building reinforcing structure of the present invention thus configured, in the opening of the building, the auxiliary pillar portion is arranged adjacent to the pillar in a non-bonded state, and the upper extension portion extended from the auxiliary pillar portion. The lower extension part and the lower extension part are respectively bonded to the upper beam and the base surface part of the building by an adhesive.

  In this way, if it is an auxiliary column part that is adjacent to the column in a non-bonded state, the structure of the existing column will not limit the installation, and the force from the brace will be applied to an appropriate position. Can be easily done. In addition, since they are joined by an adhesive, it is not necessary to perform welding work involving fire.

  Furthermore, when the upper stretched portion or the lower stretched portion is continuously provided between the auxiliary pillar portions, it is easy to keep the distance between the auxiliary pillar portions constant. Furthermore, if the upper extending portion is a beam portion bridged between the auxiliary pillar portions, a gate-shaped highly rigid brace frame structure can be obtained.

  Further, if the end portion of the brace portion is bolted to the gusset plate attached to the corner portion, it can be easily attached to the opening of the existing building on the spot. Furthermore, by providing shear reinforcement portions at both ends of the existing upper beam, the required reinforcement can be provided.

  Then, a brace frame composed of a pair of auxiliary column parts, an upper extension part, a lower extension part, and a brace part may be formed of a plurality of units or members, and the units or members may be bolted to each other. By doing so, the welding work can be performed at another place at the time of production, and the reinforcing structure can be provided at the site in the existing building by the bolt fastening work without involving fire.

It is explanatory drawing which showed the structure of the reinforcement structure of the building of embodiment of this invention. It is explanatory drawing which illustrated the structure of the pillar of the existing building. It is sectional drawing seen in the AA arrow direction of FIG. It is explanatory drawing which showed the structure of the reinforcement structure of the building of Example 1. It is sectional drawing seen in the BB arrow direction of FIG. It is explanatory drawing which showed the structure of the reinforcement structure of the building of Example 2. It is sectional drawing seen in the CC arrow direction of FIG. FIG. 6 is a diagram illustrating an analysis performed in Example 3, (a) is a diagram illustrating modeling of an existing structural member, (b) is a diagram illustrating modeling after reinforcement, and (c) is an analysis result. It is the figure shown.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a front view for explaining the configuration of the reinforcing structure for a building according to the present embodiment. In addition, FIG. 2 is an explanatory diagram illustrating the configuration of the pillars 2 of the existing building 1.

  First, the configuration of the existing building 1 provided with the building reinforcing structure of the present embodiment will be described. In a steel-framed building 1 such as a factory, pillars 2 and 2 are provided at intervals on a floor portion 11 serving as a base surface portion. The floor 11 is, for example, a reinforced concrete slab.

  Further, an upper beam 3 is bridged between the upper ends of the columns 2 and 2. In the building 1 having such a configuration, a rectangular opening 12 surrounded by columns 2 and 2 facing each other with a space, an upper beam 3 spanning between the upper ends of the columns, and an upper surface 11 a of a floor 11. Is formed.

  FIG. 2 exemplifies the configuration of the non-filled column 2 that may be used in the existing building 1. The non-filled column 2 is assembled from angle steel and flat steel. For example, a pair of angle steels are arranged as the main material portions 21 and 21 at corner positions of a rectangular cross section in a plan view, and flat steel or the like is diagonally bridged between the corner portions as a lattice part 22. .

  The ends of the lattice portion 22 are joined by the rivets 23 by being sandwiched between the main material portions 21 and 21. The side surface of the pillar 2 configured in this manner is not flat because the head of the rivet 23 is projected or one side of the angle steel is overhanging.

  Similarly, the upper beam 3 is also assembled from angle steel and flat steel. For example, as shown in FIG. 5, a pair of angle steels are arranged as the main material portions 31 and 31 at the positions of the upper chord member and the lower chord member of the truss, and flat steel or the like is provided between the upper chord member and the lower chord member. As a lattice part 32. Then, the end portion of the lattice portion 32 is sandwiched by the main material portions 31 and 31 and joined by the rivet 33.

  When such a building 1 is subjected to seismic reinforcement, generally, a reinforcing member is arranged in the opening 12 so that the structure is resistant to deformation and the seismic performance is enhanced. Braces are used for this reinforcing member, but in order to attach the brace to the existing columns and beams, it is necessary to make holes in the existing structural members and weld and join the gusset plates. is there.

  On the other hand, if a hole is made in the existing structural member, the performance of the existing structural member will be deteriorated due to the loss of the cross section. In addition, the brace cannot be attached by bolt bonding unless the drilling work is performed by a skilled worker with high construction accuracy. In addition, the gusset plate may not be attached by welding when storing easily ignitable objects or in a building where fire is avoided.

  Therefore, the reinforcing structure of the building according to the present embodiment is configured so that it is not necessary to reduce the performance of the existing structural member due to the loss of the cross section or to perform work involving fire. In addition, the structure can be provided adjacent to the pillar 2 whose side surface is not flat.

  The building reinforcement structure of the present embodiment is provided in an opening 12 of an existing building 1 that is substantially rectangular in a front view. Then, the pair of auxiliary pillars 4 and 4 interposed between the upper beam 3 serving as the upper side of the opening 12 and the floor 11 serving as the lower side, and the upper extending portion extending from the upper end of each of the auxiliary pillars 4. Is mainly constituted by a lower plate portion 7 as a lower extending portion extended from each lower end portion of the auxiliary column portion 4, and a brace portion 5.

  As shown in FIG. 3, the auxiliary pillar portion 4 is arranged adjacent to the pillar 2 in a non-bonded state. In the present embodiment, the auxiliary pillar portion 4 is arranged at a position separated from the outermost side end surface 2a of the pillar 2 by the distance d. A steel material such as H-shaped steel, an aluminum material, a stainless material, or the like can be used for the auxiliary pillar portion 4. For example, the auxiliary column portion 4 is formed in a substantially H shape in a plan view by the parallel flanges 4a and 4a and the web 4b connecting them.

  In addition, as shown in FIG. 1, the auxiliary pillar portion 4 can be configured to be divided into three units of a pillar upper portion 41, a pillar middle portion 42, and a pillar lower portion 43. The pillar upper portion 41 and the pillar middle portion 42, and the pillar middle portion 42 and the pillar lower portion 43 can be connected by a bolt joint portion 44 composed of a steel plate, a bolt and a nut, respectively.

  The upper plate portion 6 is a strip-shaped member extending from the upper end portion of the auxiliary column portion 4, and can be formed of a flat steel plate, an aluminum plate, a stainless plate, or the like. Here, the end portion of the upper plate portion 6 is interposed between the upper end surface of the auxiliary column portion 4 and the lower surface 3 a of the upper beam 3. Note that the configuration is not limited to this, and the side end surface of the upper plate portion 6 may be in contact with the side surface of the auxiliary column portion 4.

  The upper surface 6a of the upper plate portion 6 is bonded to the lower surface 3a of the upper beam 3 with an adhesive such as an epoxy resin. The length of the upper plate portion 6 may be set so that the strength obtained by joining with the adhesive can suppress the movement (sliding displacement) of the upper end portion of the auxiliary column portion 4. . In short, it suffices if the upper plate portion 6 can secure an adhesive area commensurate with the brace proof strength expected for seismic reinforcement. Even if the existing upper beam 3 is made of steel and the upper plate 6 is made of a different metal, for example, an aluminum plate, since the adhesive insulates between different kinds of metals, electrolytic corrosion does not occur.

  On the other hand, the lower plate portion 7 is a strip-shaped member that extends from the lower end portion of the auxiliary column portion 4, and can be formed of flat steel, an aluminum plate, a stainless plate, or the like. Here, the end portion of the lower plate portion 7 is interposed between the lower end surface of the auxiliary column portion 4 and the upper surface 11 a of the floor portion 11. The configuration is not limited to this, and the side end surface of the lower plate portion 7 may be brought into contact with the side surface of the auxiliary column portion 4.

  The lower surface 7a of the lower plate portion 7 is joined to the upper surface 11a of the floor portion 11 by the above-mentioned adhesive. The length of the lower plate portion 7 may be set so that the strength obtained by joining with the adhesive can suppress the movement (sliding displacement) of the lower end portion of the auxiliary column portion 4. . Further, in order to securely fix the lower plate portion 7 to the floor portion 11, a post-installed anchor may be used together.

  The ends of the brace portions 5 are connected to the corners of the pillar upper portion 41 provided with the upper ends of the auxiliary pillar portions 4 and the upper plate portion 6 at right angles. The brace portion 5 is mainly configured by a diagonal member 51 diagonally arranged in the opening 12, a gusset plate 52, and a bolt joint portion 53 for joining an end portion of the diagonal member 51 to the gusset plate 52. It The diagonal member 51 is formed of a steel material, an aluminum material, a stainless material, or the like.

  The gusset plate 52 is formed of a steel plate, an aluminum plate, a stainless plate, or the like, and is attached to a corner portion between the column upper portion 41 and the upper plate portion 6. The gusset plate 52 can be joined by welding if it is produced in another place in advance. That is, the upper edge of the gusset plate 52 is welded to the lower surface of the upper plate portion 6, and the side edge of the gusset plate 52 is welded to the side surface of the auxiliary column portion 4.

  The other end of the brace portion 5 diagonally arranged in the opening 12 is connected to a corner portion where the lower column portion 43 where the lower end portion of the auxiliary column portion 4 is provided and the lower plate portion 7 are orthogonal to each other. In this corner portion, the lower edge of the gusset plate 52 is welded to the upper surface of the lower plate portion 7, and the side edge of the gusset plate 52 is welded to the side surface of the auxiliary column portion 4.

  Next, a method for constructing the building reinforcement structure of the present embodiment will be described. Here, the existing building 1 has been used as a factory for many years, and a case where the opening 12 is reinforced as seismic reinforcement will be described as an example.

  First, in a place where fire can be used (processing factory), the units and members that form the reinforcing structure are manufactured in advance by welding work. In detail, the end portion of the upper plate portion 6 is placed on the upper end surface of the column upper portion 41 and welded. Further, a gusset plate 52 is attached to the corner portion formed by the side surface of the column upper portion 41 and the lower surface of the upper plate portion 6 by welding.

  Further, the lower end surface of the column lower portion 43 is placed on the end portion of the lower plate portion 7 and welded thereto. Further, the gusset plate 52 is attached by a welding operation to a right-angled corner portion formed by the side surface of the column lower portion 43 and the upper surface of the lower plate portion 7.

  Further, bolt holes for the bolt joints 44 are drilled in the lower end of the column upper portion 41, both ends of the column intermediate portion 42 and the upper end of the column lower portion 43. Further, bolt holes for the bolt joints 53 are also formed at both ends of the diagonal member 51. Then, a bolt hole for the bolt joint portion 53 is also drilled in the gusset plate 52.

  These processed units and members are transported to the opening 12 of the existing building 1. Then, the pillar upper portion 41, the pillar middle portion 42, and the pillar lower portion 43 are temporarily assembled to form one auxiliary pillar portion 4. The auxiliary pillar portion 4 is erected at a position separated from the side end surface 2 a of the pillar 2 by a distance d inside the opening 12.

  At this time, it is possible to position the portion where the column upper portion 41 and the upper plate portion 6 are joined and to mark the lower surface 3 a of the upper beam 3. Similarly, it is possible to position the portion where the column lower portion 43 and the lower plate portion 7 are joined and mark the upper surface 11a of the floor portion 11 with a mark.

  Then, depending on workability, the auxiliary column portion 4 is once disassembled into the column upper portion 41, the column middle portion 42, and the column lower portion 43. Subsequently, an adhesive is applied to the upper plate portion 6 and the lower surface 3 a of the upper beam 3 to bond the pillar upper portion 41 and the upper plate portion 6 to which the gusset plate 52 is attached to the lower surface 3 a of the upper beam 3.

  In addition, before or after or simultaneously with this joining work, an adhesive is applied to the upper surface 11a of the lower plate portion 7 and the floor portion 11, and the column lower portion 43 and the lower plate portion 7 to which the gusset plate 52 is attached are attached to the floor portion 11 of the floor portion 11. Bonded to the upper surface 11a.

  When the auxiliary column portion 4 is disassembled, the upper end of the column intermediate portion 42 is connected to the column upper portion 41 by the bolt joint portion 44 before the adhesive is completely cured, and the column intermediate portion 42 The lower end is connected to the column lower portion 43 by the bolt joint portion 44.

  Then, the adhesive is cured by curing until a predetermined bonding strength is exhibited. The work of installing the auxiliary pillar portion 4 is performed on the pillars 2 and 2 on both sides of the opening 12. Subsequently, the two diagonal members 51, 51 are arranged in an X shape with respect to the gusset plates 52, ...

  The end portion of the diagonal member 51 is joined to the gusset plate 52 by the bolt joint portion 53. As described above, in the existing building 1, the joining work by the adhesive and the bolt is performed, and the welding work is not performed.

Next, the function of the building reinforcing structure of the present embodiment will be described.
In the reinforcing structure for a building according to the present embodiment configured as described above, the auxiliary pillar portion 4 is arranged in the opening 12 of the building 1 so as to be adjacent to the pillar 2 in a non-joined state, and the auxiliary pillar portion 4 is provided. The upper plate portion 6 and the lower plate portion 7 extending from are bonded to the upper beam 3 and the floor portion 11 of the building 1 by an adhesive, respectively.

  In this way, if the auxiliary column portion 4 is adjacent to the column 2 in a non-bonded state, the installation is not limited by the shape of the existing column 2. In short, as shown in FIG. 2, when the side surface of the pillar 2 has unevenness such as unevenness, the side surface of the auxiliary pillar portion 4 cannot be closely attached. On the other hand, when installing the auxiliary pillar 4 with a gap (distance d), the auxiliary pillar 4 should be installed without being affected by the shape of the pillar 2 in any state. You can

  Further, it is not necessary to process or replace the existing structural members such as the pillar 2 and the upper beam 3. In particular, since the existing structural members are not removed, it is possible to prevent the seismic performance of the building 1 from temporarily decreasing.

  Further, since there is no limitation on the position where the end of the brace portion 5 is attached, the centroid of the corner portion of the auxiliary column portion 4 and the upper plate portion 6 and the corner portion of the auxiliary column portion 4 and the lower plate portion 7 are not changed. The brace portion 5 can be attached in a direction substantially matching the centroid. That is, the brace portion 5 can be easily attached to the position where the additional bending moment does not occur.

  In addition, since the work of joining the lower surface 3a of the upper beam 3 and the upper surface 11a of the floor portion 11 with an adhesive does not involve fire like welding work, it can be performed safely even inside the building 1 where fire is disliked. can do. Further, since the joining work using the adhesive and the bolt joining work do not require skill, it is possible to easily ensure quality.

  Furthermore, if the end portion of the brace portion 5 is joined to the gusset plate 52 attached to the corner portion by the bolt joint portion 53, it can be easily attached on the spot in the opening 12 of the existing building 1. That is, the brace portion 5 can be attached without performing a troublesome work such as making a hole in the pillar 2 or the upper beam 3 of the existing building 1.

  Then, a brace frame composed of the pair of auxiliary column parts 4, 4, upper plate parts 6, 6, lower plate parts 7, 7 and brace parts 5, 5 is formed by a plurality of units or members, and each unit is formed. Alternatively, the members can be connected by the bolt joints 44 and 53. With such a configuration, the welding work is performed at another place outside the building 1 at the time of manufacturing, and at the site in the existing building 1, the welding work and the bolt fastening work can be performed without using the fire. Can be provided with a reinforcing structure.

  Hereinafter, Example 1 of a form different from the building reinforcement structure described in the above-described embodiment will be described with reference to FIGS. Note that description of the same or equivalent parts as the contents described in the above embodiment will be made using the same terms or the same reference numerals.

  In the building reinforcing structure described in the first embodiment, the configurations of the upper extending portion and the lower extending portion are different from the upper plate portion 6 and the lower plate portion 7 described in the above-described embodiment. That is, in Example 1, as shown in FIG. 4, the beam portion 8 serving as the upper extending portion and the long plate portion 9 serving as the lower extending portion are continuously provided between the auxiliary pillar portions 4 and 4.

  In detail, the beam part 8 bridged between the auxiliary pillar parts 4 and 4 is a member extended from the upper end part of each of the auxiliary pillar parts 4. As shown in FIG. 5, the beam portion 8 is formed in a substantially H-shape in cross section by an upper flange 81 and a lower flange 83 arranged in parallel in the vertical direction and a web 82 connecting them. Then, the upper surface 8 a of the beam portion 8 is bonded to the lower surface 3 a of the upper beam 3 with the adhesive 84.

  As shown in FIG. 4, the side end surface of the beam portion 8 is brought into contact with the side surface of the auxiliary column portion 4 and joined by welding or the like. The configuration is not limited to this, and the end portion of the beam portion 8 may be interposed between the upper end surface of the auxiliary column portion 4 and the lower surface 3a of the upper beam 3.

  A gusset plate 52A is welded to the lower corner of the beam portion 8 and the side surface of the auxiliary column portion 4 at the corner portion where the upper portion 41 of the auxiliary column portion 4 is provided and the beam portion 8 intersect at right angles. To be joined. In the configuration of the first embodiment, when being transported to the existing building 1, the pillar upper portions 41, 41 and the gusset plates 52A, 52A are attached to both ends of the beam portion 8 as a unit.

  On the other hand, the long plate portion 9 provided between the auxiliary pillar portions 4 and 4 is a member extended from the lower end portion of each of the auxiliary pillar portions 4. The long plate portion 9 is made of flat steel or the like. Then, the lower surface 9a of the long plate portion 9 is joined to the upper surface 11a of the floor portion 11 with an adhesive.

  In the reinforcing structure for a building according to the first embodiment configured in this way, the beam portion 8 and the long plate portion 9 are continuously provided between the auxiliary pillar portions 4 and 4, so that the distance between the auxiliary pillar portions 4 and 4 is increased. Can be easily kept constant as designed.

Further, if the upper extending portion is a structural member called a beam portion 8 bridged between the auxiliary pillar portions 4 and 4, the auxiliary pillar portions 4 and 4 on both sides and the beam portion 8 form a gate-shaped brace having high rigidity. It can be a frame.
It should be noted that the other configurations and operational effects of the first embodiment are substantially the same as those of the above-described embodiment and other examples, and thus the description thereof will be omitted.

  Hereinafter, a second embodiment, which is different from the building reinforcement structure described in the above-described embodiment and first embodiment, will be described with reference to FIGS. Note that description of the same or equivalent parts as the contents described in the above-described embodiment or Example 1 will be made using the same terms or the same reference numerals.

  The reinforcing structure of the building described in the second embodiment is the structure provided in the opening 12 by the auxiliary pillar portions 4, 4, the beam portion 8, the long plate portion 9 and the brace portions 5, 5 of the above-described first embodiment. It is the same as the constructed brace frame.

  In the second embodiment, both ends of the upper beam 3 of the existing building 1 are reinforced by the shear reinforcing portions 35, 35. The shear reinforcement portion 35 is provided in the vicinity immediately above the auxiliary column portion 4. That is, the existing upper beam 3 is reinforced in order to have a structure that can withstand the shearing force acting on the upper beam 3 by newly disposing the auxiliary column portion 4.

  As shown in FIG. 7, the shear reinforcing portion 35 is provided so as to close the open side between the upper and lower main material portions 31, 31 of the upper beam 3. Specifically, the upper surface of the mounting material 352 such as chevron steel is bonded to the lower surface of the main material portion 31 serving as the upper chord member by an adhesive 354, and the upper surface of the main material portion 31 serving as the lower chord material is also bonded to the upper surface of the mounting material 352 by the adhesive agent 354. The lower surface of the attachment material 352 such as steel is joined.

  The attachment members 352 and 352 are attached so that a vertical plane that hangs from the upper chord member side and stands up from the lower chord member side is formed, and the upper and lower attachment members 352 and 352 are covered with a face plate portion 351 such as a steel plate. The face plate portion 351 is joined to the attachment member 352 by the bolt portion 353.

In the reinforcing structure for a building according to the second embodiment configured as described above, the existing upper beam 3 can be reinforced without performing welding work. Further, by providing the shear reinforcement portions 35, 35 at both ends of the upper beam 3, it is possible to perform the seismic reinforcement by the brace frame even on the existing building 1 in which the shear strength of the beam ends is insufficient. become.
It should be noted that other configurations and operational effects of the second embodiment are substantially the same as those of the above-described embodiment or other examples, and thus the description thereof will be omitted.

  Hereinafter, an analysis performed to support the effect of the reinforcing structure of the building described in the embodiment and Examples 1 and 2 will be described with reference to FIG. The description of the same or equivalent parts as the contents described in the above-described embodiment or Examples 1 and 2 will be made using the same terms or the same reference numerals.

  In Example 3, the analysis was performed by a frame analysis model in which a commonly used member was replaced with a wire rod. FIG. 8A shows a configuration of an existing frame M1 in which the pillar 2 and the upper beam 3 of the existing building 1 as described above are used as the pillar model M2 and the upper beam model M3. Here, the upper beam model M3 has a structure in which the end of the projecting portion M31 that projects from the column model M2 is simply supported.

  Further, FIG. 8B shows the configuration of a reinforcing frame M100 in which the opening M12 of the existing frame M1 is reinforced. In the opening M12, the auxiliary column model M4 corresponding to the above-described auxiliary column portion 4 and the beam model M8 corresponding to the beam portion 8 are arranged. Further, only one of the brace portions 5 is arranged as a brace model M5. Further, the lower stretched portion that is provided between the lower end portions of the auxiliary pillar portions 4 and 4 is arranged as the lower stretched model M9.

  In the analysis, the rigidity of the brace model M5 and the beam model M8 was set according to the rigidity of the actual adhesive. In addition, each modeled wire rod including the bonded part was a non-linear model considering the yield of steel and adhesive. Then, as the load P, a horizontal load of P / 2 is applied to each of the intersections (corner portions) of the column models M2 and M2 and the upper beam model M3.

FIG. 8C is a diagram comparing the frame analysis results with the horizontal axis representing the interlayer displacement and the vertical axis representing the layer shear force. As is clear from this figure, the reinforcing frame M100 is significantly improved in not only the initial rigidity but also the final structural proof strength as compared with the existing frame M1.
It should be noted that other configurations and operational effects of the third embodiment are substantially the same as those of the above-described embodiment or other examples, and therefore description thereof will be omitted.

  Although the embodiment of the present invention has been described in detail with reference to the drawings, the specific configuration is not limited to this embodiment and the example, and a design change is made to the extent not departing from the gist of the present invention. Are included in the present invention.

  For example, although the case where the base surface portion is the floor portion 11 has been described as an example in the above-described embodiments and examples, the present invention is not limited to this, and a lower beam such as a floor beam may be the base surface portion. . Further, in the above-described embodiment and examples, the steel-framed building 1 has been described, but the present invention is not limited to this, and the present invention may be applied to openings of a reinforced concrete structure or a steel-framed reinforced concrete structure. it can.

  Further, in the above-described embodiment and examples, the brace portions 5 and 5 arranged in the X-shape when viewed from the front have been described as an example, but the present invention is not limited to this, and the K-shape when viewed from the front and the V viewed from the front. It may be a brace portion arranged in a letter shape or a diagonal line in a front view.

  Further, in the above-described embodiment and examples, the case where the auxiliary pillar portion 4 is arranged at a position separated from the side end surface 2a of the pillar 2 has been described, but the present invention is not limited to this, and the pillar 2 and the auxiliary pillar portion are provided. Both may be in contact as long as they are not joined.

1: Building 11: Floor (base)
11a: upper surface 12: opening 2: column 3: upper beam 3a: lower surface 4: auxiliary column part 44: bolt joint part 5: brace part 52: gusset plate 53: bolt joint part 6: upper plate part (upper extension part)
6a: upper surface 7: lower plate portion (lower extending portion)
7a: Lower surface 8: Beam portion (upper extension portion)
8a: Upper surface 84: Adhesive 52A: Gusset plate 9: Long plate part (lower extending part)
9a: Lower surface 35: Shear reinforcement

Claims (6)

A reinforcing structure for a building having an opening of a substantially rectangular shape in a front view, which is surrounded by an upper beam spanning between a column and an upper end of a column which are opposed to each other with a space,
In the opening,
A pair of auxiliary pillar portions that are arranged adjacent to each of the pillars in a non-bonded state, and are interposed between the upper beam and the base surface portion,
An upper extending portion extending from the upper end of each of the auxiliary pillars, the upper surface of which is joined to the lower surface of the upper beam by an adhesive;
A lower extending portion extending from the lower end portion of each of the auxiliary pillar portions, the lower surface of which is joined to the upper surface of the base surface portion by an adhesive;
A reinforcing structure for a building, comprising: at least an upper end portion of the auxiliary pillar portion and a brace portion whose end portion is connected to a corner portion of the upper extending portion.   The reinforcing structure for a building according to claim 1, wherein at least one of the upper extending portion and the lower extending portion is continuously provided between the auxiliary column portions.   The reinforcing structure for a building according to claim 1, wherein the upper extending portion is a beam portion bridged between the auxiliary pillar portions.   The reinforcing structure for a building according to claim 1, wherein an end portion of the brace portion is bolted to a gusset plate attached to the corner portion.   The reinforcing structure for a building according to claim 1, wherein shear reinforcing portions are provided at both ends of the upper beam.   The pair of auxiliary pillar portions, the upper extending portion, the lower extending portion, and the brace portion are composed of a plurality of units or members, and the units or members are bolted to each other. 6. The building reinforcement structure according to any one of 1 to 5.