JP2013011151A - Earthquake strengthening structure for column-beam frame - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an earthquake strengthening structure for a column-beam frame in which earthquake strengthening can be performed more easily than the prior arts by mounting a strengthening member without performing welding on a job site.SOLUTION: A gusset plate 18 to which a terminal portion of a strengthening member 16 to be installed in a column-beam frame of a building is mounted is fixed to a column 12 in the column-beam frame of the building by a band-like fiber sheet 20 with which plate-like metal fittings 22, 24 for fixture are added in both terminal portions of the band shape. A part of the column 12 in the column-beam frame is wrapped in a peripheral direction by the band-like sheet 20 and in both the terminal portions of the fiber sheet 20 with which the metal fittings 22, 24 for fixture are added, the inner surfaces thereof are overlapped in such a manner as to hold the fiber sheet 20 between both the metal fittings 22, 24 for fixture. In such a case, the gusset plate 18 is held between the inner surfaces to be overlapped, and a gap between both the metal fittings 22, 24 for fixture is fastened by a fastening bolt 26 together with the gusset plate 18.

Description

  TECHNICAL FIELD The present invention relates to a seismic reinforcement structure for a column beam frame that is reinforced by installing a reinforcement member on a column beam frame of a building, and more specifically, a reinforcement member for a column beam frame of a building such as a steel frame, a reinforced concrete structure, or a steel reinforced concrete structure. It is related with the seismic reinforcement structure of the column beam frame.

  Conventionally, as a method of reinforcing the column beam frames of buildings such as steel frames, there is a method of installing a reinforcing member such as a cane or brace on the column beam frames of these buildings. By installing such a reinforcing member on the column beam structure of the building, the proof strength of the building can be increased against the horizontal force. At this time, in order to sufficiently transmit the stress generated in the column beam frame to the reinforcement member, it is necessary to join and integrate the end portion of the reinforcement member to the column beam frame. Therefore, the joining method is important.

  As a joining method in steel structure, welding is well known. Specifically, a gusset plate that fixes the end of a reinforcing member such as a brace with a bolt or the like is attached to a column or beam of a column beam frame by welding, and the end of a reinforcing member such as a brace is bolted to the attached gusset plate There is a method of fixing with.

  Further, in this type of joining method, a joining method that does not use welding is also known. For example, in Patent Document 1, a plate member to which a gusset plate for fixing an end portion of a reinforcing member such as a brace is fixed with a bolt or the like is bonded to a steel pipe forming a beam or a column of a building, and at each end portion of the plate member It is disclosed that a fiber sheet is wound around a steel pipe.

JP 2008-19662 A

  Here, in the case of welding, it is necessary to weld a gusset plate to a column or beam of a column beam structure on site. In this case, a large-scale welding curing is required for the purpose of preventing the occurrence of a fire or the like, leading to an increase in cost. Further, when the on-site environment is bad (for example, when it is necessary to perform welding upward), a welding defect may occur, and there is a concern about a decrease in seismic performance. Therefore, a joining method that does not require on-site welding is desired.

  On the other hand, the method described in Patent Document 1 is a joining method that does not require welding in the field, but since the fiber sheet is wound around the steel pipe in the field, the complicated process of winding the fiber sheet Requires a lot of labor and time during construction. Therefore, a method that does not use welding and that can more easily join the gusset plate to the column beam frame is desired.

  The problem to be solved by the present invention is to provide a seismic reinforcement structure for a column beam frame that can be seismically reinforced by attaching a reinforcing member without performing welding on site, and can be reinforced more simply than before. is there.

  In order to solve the above-mentioned problem, the seismic reinforcement structure for a column beam structure according to the present invention is a seismic reinforcement structure for a column beam structure that is reinforced by installing a reinforcing member on the column beam structure of a building. Alternatively, a part of the beam is wrapped with a belt-like fiber sheet along the circumferential direction, and a plate-like fixing hardware is attached to each of both ends of the fiber sheet, and the fixing material of the fiber sheet is attached. Both ends of the fiber sheet are sandwiched between fixing hardware by joining the inner surfaces at both ends, and at this time, between the fixing hardware to be combined together with both ends of the fiber sheet, A gusset plate to which an end portion is attached is sandwiched, and the fiber sheet is tightly fixed to the outer peripheral surface of the column or beam by tightening a fastening bolt between the fixing hardware together with the gusset plate, The gusset plates via Wei sheet is fixed to the pillar or beam, in which the subject matter that ends of the reinforcing member to the gusset plates are attached.

  Further, the seismic reinforcement structure for another column beam frame according to the present invention is arranged along the longitudinal direction of the belt in the column beam frame earthquake resistance reinforcement structure that is reinforced by installing a reinforcing member on the column beam frame of the building. A column or a part of the beam of the column beam frame is wrapped along the circumferential direction by a combination of a plurality of strip-like fiber sheets, and a plate-like fixing hardware is provided at each end of the plurality of fiber sheets. Are attached to each other, and the ends of the fiber sheets are sandwiched between the fixing hardware by joining the inner surfaces of the ends of the adjacent fiber sheets to which the fixing hardware is attached. The gusset plate to which the end portion of the reinforcing member is attached together with the end portion of the fiber sheet is sandwiched, and the column or the gusset plate is fastened with a fastening bolt between the fixing hardware together with the gusset plate. A combination of the plurality of fiber sheets is tightly fixed to the outer peripheral surface of the plurality of sheets, and a plurality of gusset plates are fixed to the pillars or beams via the combination of the plurality of fiber sheets. The gist is that the ends of the reinforcing members are respectively attached.

  In these cases, it is preferable that the end portion of the fiber sheet is folded at the front end of the fixing hardware and fixed to both surfaces of the fixing hardware.

  And the said gusset plate is provided with the stress dispersion | distribution part extended along the outer peripheral surface of the said pillar or a beam from the base end of the clamping part used as the part pinched | interposed between the fitting metal fittings fitted together, From the said reinforcement member It is preferable that the stress generated in the gusset plate due to the compressive force transmitted to the gusset plate is distributed along the outer peripheral surface of the column or beam at the stress distribution portion.

  Furthermore, it is preferable that the base end of the fixing hardware is formed with a leg portion that contacts the outer peripheral surface of the column and stabilizes the fixing hardware.

  And the said fiber sheet may be adhere | attached on the outer peripheral surface of the said column by the contact | adherence surface with the outer peripheral surface of the said column.

  According to the seismic reinforcement structure for a column beam frame according to the present invention, the reinforcing member is made of a plate-shaped fixing hardware attached to each of both ends of a belt-like fiber sheet that wraps a part of the column or beam in the circumferential direction. Since the gusset plate to be attached is sandwiched and fixed together with the fiber sheet, the gusset plate can be attached to the column or beam of the column beam frame without performing on-site welding. And by attaching a reinforcing member to this gusset plate, earthquake-proof reinforcement can be performed without performing on-site welding.

  In addition, the fiber sheet is not wound many times as in the conventional case, but the columnar beam frame is constructed by tightening the plate-shaped fixing hardware attached to each of both ends of the fiber sheet together with the gusset plate with the fastening bolt. Since a gusset plate can be attached to the column or beam, it can be reinforced more simply than before.

  And in the seismic reinforcement structure of the other column beam frame according to the present invention, a part of the column or beam is wrapped in the circumferential direction by a combination of a plurality of strip-like fiber sheets arranged along the longitudinal direction of the strip, Since the plurality of gusset plates are fixed to the columns or beams through the combination of the plurality of fiber sheets, the basic structure for attaching the gusset plates to the columns or beams is the seismic resistance of the column beam frame according to the present invention. Similar to the reinforcing structure. For this reason, there exists an effect similar to the seismic reinforcement structure of the column beam frame concerning the present invention.

  In these cases, when the end of the fiber sheet is folded back at the front end of the fixing hardware and fixed to both surfaces of the fixing hardware, the fibers are fixed when the fixing hardware is tightened between the fixing hardware. Resistance to the tensile force generated in the sheet is improved. Thereby, the attachment strength of a gusset plate improves.

  And when a gusset plate is provided with said stress dispersion | distribution part, even when a compressive force acts on a gusset plate from a reinforcement member, the compressive stress of a gusset plate is along the outer peripheral surface of a pillar or a beam in this stress dispersion | distribution part. Since it is dispersed, stress concentration at the proximal end of the clamping portion is suppressed, and it is possible to prevent the outer peripheral surface of the column or beam from being deformed by this compressive force.

  And when the leg part which contacts the outer peripheral surface of the column and stabilizes the fixing metal part is formed at the base end of the fixing metal object, it is adhered to each of both end parts of the non-rigid material such as the fiber sheet. The plate-like fixing hardware can be stably fixed along the outer peripheral surface of the column. Thereby, the attachment strength of a gusset plate is stabilized.

  And if the fiber sheet is bonded to the outer peripheral surface of the column at the contact surface with the outer peripheral surface of the column, the integrity of the fiber sheet and the column is enhanced. Thereby, the attachment strength of a gusset plate improves.

It is a schematic diagram of the seismic reinforcement structure of the column beam frame which concerns on one Embodiment of this invention. It is the figure which showed the combination of the fiber sheet used for the seismic reinforcement structure of the column beam frame of FIG. 1, a fixing metal fitting, and a gusset plate. It is the figure which expanded and showed the attachment part of the gusset plate in the earthquake-proof reinforcement structure of the column beam frame of FIG. It is the figure which showed the combination of the fiber sheet of the other embodiment applicable to the seismic reinforcement structure of the column beam frame which concerns on this invention, the fixing metal fitting, and a gusset plate. It is the figure which showed the combination of the fiber sheet of the other embodiment applicable to the seismic reinforcement structure of the column beam frame which concerns on this invention, the fixing metal fitting, and a gusset plate. It is the figure which showed the combination of the fiber sheet of the other embodiment applicable to the seismic reinforcement structure of the column beam frame which concerns on this invention, the fixing metal fitting, and a gusset plate. It is the figure which showed the combination of the fiber sheet of the other embodiment applicable to the seismic reinforcement structure of the column beam frame which concerns on this invention, the fixing metal fitting, and a gusset plate. FIG. 4 is a diagram for explaining deformation that may occur when a compressive force is applied to a gusset plate in the seismic reinforcement structure for the column beam frame of FIG. 3. It is the figure which showed the combination of the fiber sheet of the other embodiment applicable to the seismic reinforcement structure of the column beam frame which concerns on this invention, the fixing metal fitting, and a gusset plate. It is a schematic diagram of the earthquake-proof reinforcement structure of the column beam frame to which the gusset plate shown in FIG. 9 is applied. It is the figure which expanded and showed the attachment part of the gusset plate in the earthquake-proof reinforcement structure of the column beam frame which concerns on other embodiment of this invention. It is the figure which expanded and showed the attachment part of the gusset plate in the earthquake-proof reinforcement structure of the column beam frame which concerns on other embodiment of this invention.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 is a schematic diagram of a seismic reinforcement structure for a column beam frame according to an embodiment of the present invention. FIG. 2 is a view showing a combination of a fiber sheet, a fixing hardware, and a gusset plate used in the seismic reinforcement structure of the column beam frame of FIG. FIG. 3 is an enlarged view of a gusset plate mounting portion in the seismic reinforcement structure of the column beam frame of FIG.

  In the seismic reinforcement structure 10 for a column beam frame according to an embodiment of the present invention shown in FIG. 1, the building to which the seismic reinforcement is applied is made of a steel structure. The column 12 of the column beam frame is a steel tube column (a so-called BOX column) made of a steel pipe, and the steel tube has a substantially square sectional shape in the radial direction. The beam 14 of the column beam frame is made of H-section steel. Seismic reinforcement of the column beam frame is performed by installing braces 16 as reinforcing members for the column beam frame having such a configuration. For the brace 16, for example, a steel material such as an H-shaped steel or a grooved steel is used.

  The brace 16 resists horizontal force (force caused by interlayer deformation) acting on the building due to vibration such as an earthquake, and is installed so as to connect the diagonals of the column beam frame, for example. Since the beam 14 of the steel column beam frame usually has a slab, the end of the brace 16 is attached to the column 12 at a position adjacent to the joint between the column 12 and the beam 14. For example, when the beam 14 has no slab, the end of the brace 16 may be attached to the beam 14 at a position adjacent to the joint, or both the column 12 and the beam 14 at a position adjacent to the joint. It may be attached to. A gusset plate 18 is used as a mounting bracket for attaching the end of the brace 16 to the column 12 of the column beam frame.

  The gusset plate 18 is fixed to a brace fixing hole 18a provided for fixing the end portion of the brace 16 with a bolt 28, and fixing hardware 22, 24, which will be described later, together with the fiber sheet 20 with a fastening bolt 26. A fixing hole 18b for fixing hardware provided for this purpose is provided.

  The fiber sheet 20 is configured by a fiber made of high-strength fibers such as carbon fibers and aramid fibers formed into a sheet shape. The fiber sheet 20 is formed in a band shape, and plate-like fixing hardwares 22 and 24 are attached to both ends. The fixing hardware 22 and 24 may be integrated by being fixed in advance to both ends of the fiber sheet 20 by adhesion or the like, or the fixing hardware 22 and 24 and the fiber sheet 20 are integrated before construction. However, it may be a separate and independent member.

  The fixing hardwares 22 and 24 are composed of a pair of sets attached to both ends of the belt-like fiber sheet 20. Each of the pair of fixing hardwares 22 and 24 is provided with fastening portions 22a and 24a which are portions that sandwich the gusset plate 18 together with the fiber sheet 20 when fastened together, and are fastened together. Leg portions 22b and 24b are extended from the base ends of 22a and 24a, and are bent from the base ends of the fastening portions 22a and 24a so as to face each other. The leg portions 22b and 24b are for stabilizing the plate-like fixing hardwares 22 and 24 along the outer peripheral surface of the column 12, and are in contact with the outer peripheral surface of the column 12 with the fiber sheet 20 interposed therebetween. Part. Bolt insertion holes 22c and 24c for passing fastening bolts 26 are formed in the fastening portions 22a and 24a of the fixing hardwares 22 and 24, respectively. When the fixing hardwares 22 and 24 are fixed in advance to both ends of the fiber sheet 20 by adhesion or the like, the fixing hardwares 22 and 24 are fixed to the fiber sheet 20 on the inner surfaces of the fastening portions 22a and 24a.

  The ends of the fiber sheet 20 are folded back at the tips of the fastening portions 22a and 24a of the fixing hardwares 22 and 24. The folded end of the fiber sheet 20 may be fixed to the outer surfaces of the fastening portions 22a and 24a by adhesion or the like, or may not be fixed.

  The folded portion 20a by folding the fiber sheet 20 is in contact with the tips of the fastening portions 22a, 24a of the fixing hardware 22, 24, and the fiber sheet 20 is placed at the tips of the fastening portions 22a, 24a of the fixing hardware 22, 24. The tip side rounded portions 22d and 24d are formed to alleviate stress concentration at the folded portion 20a. Further, leg portions 22b and 24b are extended from the base ends of the fastening portions 22a and 24a of the fixing hardwares 22 and 24. The leg portions 22b and 24b are bent from the base ends of the fastening portions 22a and 24a. The bent portions are base end side round portions 22e and 24e that alleviate stress concentration at the contact portion of the fiber sheet 20 that contacts this portion (the base ends of the fastening portions 22a and 24a).

  Here, in order to fix the gusset plate 18 to the column 12 of the column beam frame, the belt-like fiber sheet 20 is used. First, a part of the column 12 of the column beam frame is wrapped in the circumferential direction using the belt-like fiber sheet 20. Next, fixing metal pieces 22 and 24 are attached to both ends of the fiber sheet 20. Next, the inner surfaces of both ends of the fiber sheet 20 to which the fixing hardwares 22 and 24 are attached are aligned. Thereby, both ends of the fiber sheet 20 are sandwiched between the fixing hardwares 22 and 24. At this time, the gusset plate 18 is sandwiched together with both ends of the fiber sheet 20 between the fixing hardwares 22 and 24 to be combined. Next, the fixing hardware 22 and 24 are tightened together with the gusset plate 18 using the fastening bolts 26.

  When the space between the fixing hardwares 22 and 24 is tightened, the fiber sheet 20 is pulled in the direction of the arrow in FIG. 3 (the direction in which the fiber sheet 20 is tightened along the outer peripheral surface of the column 12) and closely contacts the outer peripheral surface of the column 12. . At the same time, the leg portions 22b and 24b of the plate-shaped fixing hardware 22 and 24 are in contact with the outer peripheral surface of the column 12 with the fiber sheet 20 interposed therebetween, and the plate-shaped fixing hardware 22 and 24 are on the outer peripheral surface of the column 12. Stabilize along. The fiber sheet 20 is fixed to the outer peripheral surface of the column 12 by tension (clamping force) generated in the fiber sheet 20. The gusset plate 18 fastened to the fixing hardwares 22 and 24 through the fiber sheet 20 fixed to the column 12 is fixed to the column 12. The column beam frame is reinforced by attaching the end of the brace 16 as a reinforcing member to the gusset plate 18 fixed to the column 12 and installing the brace 16 on the column beam frame.

  According to the seismic reinforcement structure 10 of such a column beam frame, the plate-like fixing hardware 22, 24 attached to each of both ends of the belt-like fiber sheet 20 that wraps a part of the column 12 in the circumferential direction. Since the gusset plate 18 for attaching the brace 16 as the reinforcing member is sandwiched and fixed together with the fiber sheet 20, the gusset plate 18 can be attached to the column 12 of the column beam frame without performing on-site welding.

  At this time, the fiber sheet is not wound many times as in the prior art, and the plate-like fixing hardware 22 and 24 attached to each of both ends of the fiber sheet 20 are fastened together with the gusset plate 18 with the fastening bolts 26. By tightening, the gusset plate 18 can be attached to the column 12 of the column beam frame, so that it can be more easily reinforced than before.

  At this time, when the ends of the fiber sheet 20 are folded back at the ends of the fixing hardware 22 and 24 and are fixed to both surfaces of the fixing hardware 22 and 24 by adhesion or the like, the both ends are fixed using the fastening bolts 26. A resistance force improves with respect to the tensile force which arises in the fiber sheet 20 when the metal fittings 22 and 24 are tightened. Thereby, the attachment strength of the gusset plate 18 is improved.

  At this time, the folded portions 20a of the folded fiber sheet 20 come into contact with the tips of the plate-like fixing hardware 22 and 24, but the stress concentration at the folded portions 20a of the fiber sheet 20 is eased at the tips. Since the distal end side rounded portions 22d and 24d are formed, a decrease in breaking strength at the folded portion 20a of the fiber sheet 20 is suppressed. Thereby, the attachment strength of the gusset plate 18 is improved.

  Further, at this time, the fiber sheet 20 is also in contact with the base ends of the plate-shaped fixing hardwares 22 and 24, but the base end side rounded portion that relaxes stress concentration at the contact portion of the fiber sheet 20 also with the base ends. Since 22e and 24e are formed, the fall of the breaking strength in a contact part with the base end of the fixing metal objects 22 and 24 of the fiber sheet 20 is suppressed. Thereby, the attachment strength of the gusset plate 18 is improved.

  The fiber sheet 20 may or may not be adhered to the outer peripheral surface of the column 12 at a close contact surface with the outer peripheral surface of the column 12. For example, when bonded, the integrity of the fiber sheet 20 and the column 12 is further increased. Thereby, the attachment strength of the gusset plate 18 is improved.

  Since the outer peripheral length of the column 12 of the column beam frame of the building is determined according to the type and performance of the building, the length and width of the fiber sheet 20, the size of the fixing hardware 22, 24, etc. , Can be predetermined. For this reason, for example, the length or width of the fiber sheet 20 is set to a predetermined length in advance at a factory or the like, and the fixing hardware 22 and 24 having a predetermined size is fixed to a predetermined position of the fiber sheet 20. The band-shaped fiber sheet 20 in which the plate-shaped fixing hardwares 22 and 24 are fixed to both ends of the band-shaped ends can be produced as a product. In this case, a process of fixing the fixing hardwares 22 and 24 to the fiber sheet 20 at the site does not occur.

  In addition, the fiber sheet 20 does not necessarily have to be folded at the tips of the plate-like fixing hardwares 22 and 24. For example, as in another embodiment shown in FIG. 4, the end of the fiber sheet 20 is sandwiched between the fixing hardware 22 and 24 to be joined, or by bonding or the like on the inner surface of the fixing hardware 22 and 24. Although it is fixed, it is not fixed on the outer surface of the fixing hardware 22, 24 because it is not folded back on the outer surface of the fixing hardware 22, 24.

  When the ends of the fiber sheet 20 are folded and fixed to both surfaces of the fixing hardware 22 and 24, the ends of the fiber sheet 20 are fixed only to the inner surfaces of the fixing hardware 22 and 24; In comparison, there is an advantage that resistance to tensile force generated in the fiber sheet 20 is high.

  And the shape of the fiber sheet 20 is not limited to the said embodiment. For example, the shape as shown in FIGS. 5-7 is the figure which showed the combination of the fiber sheet of the other embodiment applicable to the seismic reinforcement structure of the column beam frame which concerns on this invention, the fixing hardwares 22 and 24, and the gusset plate 18. FIG.

  The fiber sheet 30 shown in FIG. 5 includes a plurality of strips arranged in a narrow strip shape having a width shorter than the width of the fastening portions 22a and 24a of the fixing hardware 22 and 24 (length in the vertical direction shown in FIG. 5). It is composed of a bundle of narrow fiber sheets 32. Each of the plurality of strip-like fiber sheets 32 is fixed to the fastening portions 22a and 24a of the plate-like fixing hardware 22 and 24 at both ends in the length direction thereof by bonding or the like. A plurality of strip-like fiber sheets 32 may be integrated with each other, and before the construction, each of the plurality of strip-like fiber sheets 32 and the fixing hardwares 22 and 24 are integrated by bonding or the like. It may not be made into a separate and independent member.

  The plurality of narrow fiber sheets 32 are arranged at intervals so as not to contact each other. In the fastening portions 22a and 24a of the fixing hardware 22 and 24, the bolt insertion holes 22c and 24c for passing the fastening bolts 26 are, for example, a narrow strip-shaped fiber sheet 32 and a narrow strip-shaped fiber sheet 32. What is necessary is just to form in the part etc. in which the fiber sheet 32 is not arrange | positioned. In addition, the multiple strip-like fiber sheets 32 can also be arranged without a gap so as to contact each other.

  The fiber sheet 40 shown in FIG. 6 is constituted by a single belt-like fiber sheet 40. The belt-like fiber sheet 40 and the fixing hardwares 22 and 24 may be integrated in advance by adhesion or the like, and before construction, the belt-like fiber sheet 40 and the fixing hardwares 22 and 24 are bonded or the like. They may not be integrated and may be separate and independent members. The belt-like fiber sheet 40 shown in FIG. 6 has a width shorter than the width of the fastening portions 22a, 24a of the fixing hardware 22, 24 (the vertical length shown in FIG. 6). Both end portions in the vertical direction can be arranged at the center portions in the width direction of the fastening portions 22a, 24a of the fixing hardwares 22, 24. At this time, both end portions in the width direction of the fastening portions 22a and 24a of the fixing hardwares 22 and 24 are portions where the belt-like fiber sheet 40 is not disposed. For example, bolt insertion holes 22c for passing the fastening bolts 26 through these portions. 24c may be formed.

  The fiber sheet 50 shown in FIG. 7 is composed of two thin strip-like fiber sheets 52. The two strip-like fiber sheets 52 have a width shorter than the width of the fastening portions 22a, 24a of the fixing hardware 22, 24 (the length in the vertical direction shown in FIG. 7). Each of the two strip-like fiber sheets 52 is fixed to the fastening portions 22a, 24a of the plate-like fixing hardware 22, 24 by bonding or the like at both ends in the length direction, and the fixing hardware 22, 24 is fixed. The two strip-like fiber sheets 52 may be integrated with each other, and before the construction, the two strip-like fiber sheets 52 and the fixing hardwares 22 and 24 are integrated by bonding or the like. It may not be made into a separate and independent member. The central portion in the width direction of the fastening portions 22a and 24a of the fixing hardware 22 and 24 is a portion where the two thin fiber sheets 52 are not arranged. For example, a bolt for passing the fastening bolt 26 through this portion. The insertion holes 22c and 24c may be formed.

  5-7, the bolt insertion holes 22c and 24c can be formed in the part by which the strip | belt-shaped fiber sheets 30-50 are not arrange | positioned among the fastening parts 22a and 24a of the metal fittings 22 and 24 for fixation. In this case, since it is not necessary to make holes in the belt-like fiber sheets 30 to 50 and pass the fastening bolts 26, the configuration is simpler than that of the above embodiment using the belt-like fiber sheet 20. .

  Here, since the gusset plate 18 shown in FIGS. 2 to 7 is a flat plate, when a compressive force is applied from the brace 16 to the gusset plate 18, the base end of the gusset plate 18 (the outer peripheral surface side of the column 12). ) The stress is concentrated. In this case, depending on the magnitude of the compressive force, for example, as shown in FIG. 8, the column 12 is recessed as indicated by a dotted line at the center portion in the width direction of the outer peripheral surface of the column 12 where the proximal end of the gusset plate 18 is located ( There is a risk of deformation.

  Therefore, as a measure for suppressing such deformation, FIGS. 9 to 10 show another embodiment in which stress is not concentrated on the base end (the outer peripheral surface side of the column 12) of the gusset plate.

  In FIG. 9, the combination of the fiber sheet of the other embodiment applicable to the seismic reinforcement structure of the column beam frame which concerns on this invention, the metal fitting for fixation, and a gusset plate is shown. 9 is different from that shown in FIG. 2 in that the shape of the gusset plate is different, and the configuration other than this is the same as that shown in FIG. Omitted.

  In the gusset plate 60, a brace fixing hole 60 a provided for fixing the end of the brace 16 with the bolt 28 and fixing bolts 26 and 24 together with the fiber sheet 20 with the fastening bolt 26. A fixing hole 60b for fixing hardware provided is provided. The fixing hole 60 b is provided in the clamping portion 62 that is a portion sandwiched between the fixing hardwares 22 and 24 that are attached to and joined to both ends of the fiber sheet 20.

  A stress distribution portion 64 is formed integrally with the clamping portion 62 at the base end (the outer peripheral surface side of the column 12) of the clamping portion 62 of the gusset plate 60. The stress dispersion portion 64 extends along the outer peripheral surface of the column 12 from the proximal end of the clamping portion 62. Accordingly, as shown in FIG. 10, when a compressive force is applied from the brace 16 to the gusset plate 60, the compressive stress of the gusset plate 60 is dispersed along the outer peripheral surface of the column by the stress dispersion portion 64. Stress concentration at the base end of 62 can be suppressed, and the outer peripheral surface of the column 12 can be prevented from being recessed (deformed) by this compressive force.

  Here, the pillar 12 is a steel pipe pillar (so-called BOX pillar) having a substantially square cross-sectional shape in the radial direction, and there are adjacent outer surfaces at both ends in the width direction of the pillar 12. This outer surface is a flange surface that supports both ends in the width direction of the surface to which the gusset plate 60 is attached. The stress distribution portion 64 extends to the top of the flange surface (up to both ends in the width direction of the column 12), and can distribute the stress to both ends in the width direction of the column 12. That is, stress can be transmitted to the flange surfaces at both ends in the width direction. Thereby, the outer surface of the pillar 12 is made more difficult to dent (it is hard to deform | transform).

  The plate thickness of the stress distribution portion 64 is preferably at least larger than the plate thickness of the column 12 from the viewpoint of ensuring a stress distribution function.

  Here, in each of the above embodiments, the fiber sheet and the fixing hardware are used for attaching the gusset plate 16 only within one wall surface surrounded by the pillars 12 and the beams 14, but for example, It can also be used to attach two or more gusset plates to two or more adjacent wall surfaces at the same time.

  FIG. 11 and FIG. 12 are enlarged views showing a gusset plate mounting portion in a seismic reinforcement structure for a column beam frame according to another embodiment of the present invention. FIG. 11 shows an example of installation with respect to a pillar arranged at a corner of a building, for example, and two wall surfaces orthogonal to each other at the corner are simultaneously used by using a fiber sheet or a fixing hardware. A gusset plate is attached. FIG. 12 shows an example of installation with respect to a pillar arranged in a plane of a building. Two adjacent wall surfaces in the same plane are simultaneously used with two fiber sheets and fixing hardware. A gusset plate is attached.

  The structure shown in FIG. 11 and the structure shown in FIG. 12 use two fiber sheets 20, two pairs of fixing hardware 22, 24, and two gusset plates 60, as compared with the structure shown in FIG. It is different. Since the other configuration is the same as that shown in FIG. 10, the description thereof is omitted.

  In FIG. 11, two belt-like fiber sheets 201 and 202 are arranged along the longitudinal direction of the belt. A part of the pillar 12 is wrapped along the circumferential direction by the combination of the two fiber sheets 201 and 202. Plate-shaped fixing hardwares 22 and 24 are attached to the end portions 201a, 201b, 202a and 202b of the two fiber sheets 201 and 202, respectively.

  Here, the inner surface of one end 201a to which the fixing hardware 24 of the first fiber sheet 201 is attached, and the inner surface of one end 202a to which the fixing hardware 22 of the second fiber sheet 202 is attached. , The end portions 201a and 202a of the fiber sheets 201 and 202 are sandwiched between the fixing hardwares 22 and 24. At this time, the fiber sheets 201 and 202 are sandwiched between the fixing hardwares 22 and 24. The clamping part 621 of the first gusset plate 601 is sandwiched together with the end parts 201a and 202a.

  Also, the inner surface of the other end 201b to which the fixing metal piece 22 of the first fiber sheet 201 is attached, and the inner surface of the other end 202b to which the fixing metal piece 24 of the second fiber sheet 202 is attached, The end portions 201b and 202b of the fiber sheets 201 and 202 are sandwiched between the fixing hardwares 22 and 24, and the ends of the fiber sheets 201 and 202 are interposed between the fixing hardwares 22 and 24 to be combined. The clamping part 622 of the second gusset plate 602 is sandwiched together with the parts 201b and 202b.

  In this state, between the fixing hardware 22 and 24 together with the gusset plate 601 is tightened with the fastening bolt 26, and when between the fixing hardware 22 and 24 together with the gusset plate 602 is tightened with the fastening bolt 26, The combination of the two fiber sheets 201 and 202 is tightly fixed to the outer peripheral surface of the twelve. At the same time, the surfaces of the stress distribution portions 641 and 642 of the gusset plates 601 and 602 are in contact with the outer peripheral surface of the column 12 with the surfaces aligned. As a result, the two gusset plates 601 and 602 are fixed to the column 12 through the combination of the two fiber sheets 201 and 202. Next, if the end portions of the braces 16 as reinforcing members are attached to the gusset plates 601, 602, two wall surfaces orthogonal to each other at the corner portions can be reinforced.

  The structure shown in FIG. 11 is a structure in which two gusset plates 601 and 602 are fixed to the outer surfaces of two adjacent (orthogonal) surfaces of a column 12 made of a steel tube column having a substantially square cross section. The structure shown in FIG. 12 is different in that two gusset plates 601 and 602 are fixed to the outer surfaces of two opposing (parallel) surfaces. Since the other configuration is the same as that shown in FIG. 11, the description thereof is omitted. Therefore, if the edge part of the brace 16 as a reinforcement member is attached to each gusset plate 601,602, two adjacent wall surfaces can be reinforced in the same plane.

  In the structure shown in FIG. 11 and the structure shown in FIG. 12, a T-shaped gusset plate 60 having a clamping part 62 and a stress dispersion part 64 is used as the gusset plate. The shape of the gusset plate is not particularly limited to a T-shape. Of course, other shapes are possible. For example, as shown in FIG. 2 and the like, a flat gusset plate 18 having no stress dispersion portion is applied to the structure shown in FIG. 11 or the structure shown in FIG. 12 in place of the T-shaped gusset plate 60. You can also.

  Moreover, in the structure shown in FIG. 11 and the structure shown in FIG. 12, although the example which attaches two gusset plates simultaneously to two adjacent wall surfaces is shown, these are given as an example, and in this invention It is also possible to attach two or more gusset plates simultaneously to two or more adjacent wall surfaces. For example, three to four strip-shaped fiber sheets are prepared, three to four pairs of fixing hardware are prepared, and three gusset plates are simultaneously applied to three adjacent wall surfaces or four adjacent wall surfaces by combining them. Of course, four gusset plates can also be attached.

  Although the embodiments of the present invention have been described in detail above, the present invention is not limited to the above-described embodiments, and various modifications can be made without departing from the gist of the present invention.

  For example, in the above-described embodiment, the present invention is described by taking a steel structure as an example of a building to be seismic reinforced. However, a building to which such a seismic reinforcement structure can be applied is a steel structure. Needless to say, the present invention can also be applied to a reinforced concrete structure or a steel frame reinforced concrete structure. For example, if the building to which seismic reinforcement is applied is reinforced concrete, etc., and there is a non-smooth corner on the pillar to which the fiber sheet is attached, square metal fittings are installed as necessary, and the fiber sheet breaks at the corner. It may not be easy.

  In the above embodiment, the present invention has been described by taking a steel pipe column having a substantially quadrangular cross-sectional shape in the radial direction as the column 12 of the column beam frame, but the cross-sectional shape other than the substantially quadrangular shape (for example, It may be a steel pipe column having a circular shape or a polygonal shape other than a quadrangular shape, or a column made of a shape steel such as an H-shaped steel or a grooved steel. The seismic reinforcement structure of the present invention can be applied even to a pillar having such a structure. Also in this case, square metal objects may be installed as necessary so that the fiber sheet is not easily broken at the corners of the shape steel.

  Moreover, in the said embodiment, although this invention was demonstrated taking the brace as an example as a reinforcement member, the seismic reinforcement structure of this invention is applicable also to reinforcement members, such as a cane.

  In the above embodiment, the present invention has been described by taking the example in which the leg portion is provided at the base end of the fastening portion of the fixing hardware. However, even if the leg portion does not exist, good. In this case, it is preferable that a proximal end round portion having the same shape as the distal end side round portion at the distal end of the fastening portion is also provided at the proximal end of the fastening portion.

  Moreover, in the said embodiment, a board | plate material etc. can also be further arrange | positioned between the fastening parts of the fixing hardware for the purpose of adjusting the fastening condition to the pillar of a fiber sheet.

10 Seismic reinforcement structure for column beam structure 12 Column 14 Beam 16 Reinforcement member (brace)
18 Gusset plate 20 Fiber sheet 22, 24 Fixing hardware 26 Fastening bolt

Claims (6)

In the seismic retrofit structure of a column beam frame that is reinforced by installing reinforcing members on the column beam frame of the building,
A part of the column or beam of the column beam frame is wrapped with a belt-like fiber sheet along the circumferential direction,
A plate-shaped fixing hardware is attached to each of both ends of the fiber sheet,
The both ends of the fiber sheet are sandwiched between the fixing hardware by joining the inner surfaces thereof at both ends to which the fixing hardware of the fiber sheet is attached,
At this time, a gusset plate to which the end of the reinforcing member is attached is sandwiched between the fixing hardware to be fitted together with both ends of the fiber sheet,
The fiber sheet is tightly fixed to the outer peripheral surface of the column or beam by fastening the fixing hardware together with the gusset plate with a fastening bolt, and the column or beam is fixed to the column or beam via the fiber sheet. Fixed to
A seismic reinforcement structure for a column beam structure, wherein an end of the reinforcing member is attached to the gusset plate. In the seismic retrofit structure of a column beam frame that is reinforced by installing reinforcing members on the column beam frame of the building,
A column or a part of the beam of the column beam frame is wrapped along the circumferential direction by a combination of a plurality of strip-shaped fiber sheets arranged along the longitudinal direction of the strip,
Each of the end portions of the plurality of fiber sheets is accompanied by a plate-like fixing hardware,
The end of the fiber sheet is sandwiched between the fixing hardware by combining the inner surfaces of the ends to which the fixing hardware of the adjacent fiber sheet is attached,
At this time, a gusset plate to which the end of the reinforcing member is attached is sandwiched between the fixing metal fittings together with the end of the fiber sheet,
The combination of the plurality of fiber sheets is closely fixed to the outer peripheral surface of the pillar or beam by fastening the fixing hardware together with the gusset plate with a fastening bolt, and the combination of the plurality of fiber sheets is A plurality of gusset plates are fixed to the column or beam via,
An end of the reinforcing member is attached to each of the plurality of gusset plates.   3. The seismic reinforcement structure for a column beam frame according to claim 1, wherein an end portion of the fiber sheet is folded back at a front end of the fixing hardware and fixed to both surfaces of the fixing hardware.   The gusset plate includes a stress distribution portion that extends along the outer peripheral surface of the column or beam from a proximal end of a clamping portion that is a portion to be sandwiched between the fittings to be fitted together, and the gusset from the reinforcing member. The stress generated in the gusset plate by the compressive force transmitted to the plate is dispersed along the outer peripheral surface of the column or beam at the stress dispersion portion. Seismic reinforcement structure for column beam structures.   The base end of the fixing hardware is formed with a leg portion that contacts the outer peripheral surface of the column and stabilizes the fixing hardware. Seismic reinforcement structure for column beam structures.   The seismic reinforcement structure for a column beam frame according to any one of claims 1 to 5, wherein the fiber sheet is bonded to the outer peripheral surface of the column at a close contact surface with the outer peripheral surface of the column. .

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