JP4576899B2 - Method for manufacturing column-beam joint structure and column-beam joint structure - Google Patents

Description

  The present invention relates to a method for manufacturing a column-to-beam connection structure and a column-to-beam connection structure of a steel structure having a column and a beam for setting a yield point at a beam part away from the beam-to-column connection.

JP 2002-88912 A JP 2001-207533 A Toshio Fujioka, “Research on Strengthening RBS Method”, Summary of Academic Lectures of the Architectural Institute of Japan (Tokai), Conference of Architectural Institute of Japan, September 2003, No. 22487, p. 973,974

  As a column beam connection structure to which a so-called RBS method (Reduced Beam Section Connections) in which a yield point is set at a site away from the beam-column joint is applied, for example, as shown in FIG. 12, the beam beam is separated from the beam-column joint 2b. Non-Patent Document 1 proposes a column beam connection structure 60 in which a notch (notch) 25 connected to the flange 3 of the beam 2 and the reinforcing plates 23 and 24 is formed. Further, for example, Patent Document 1 proposes a column beam joining structure 70 in which a notch (notch) 27 is formed in a longitudinal rib plate 26 as shown in FIG. Further, for example, Patent Document 2 proposes a column beam joining structure 80 in which a notch (notch) 29 is formed in a cover plate 28 as shown in FIG. Each of the beam-column joint structures 60, 70, and 80 prevents a ductile fracture or a brittle fracture from occurring in the beam-column joint 2b due to the external force when a large external force is applied due to an earthquake or the like. It is like that.

  However, in the column-beam joint structure 60 in Non-Patent Document 1, a lot of welding is required to attach the reinforcing plate to the beam, which is troublesome. The end face of the notch 25 needs to be grinder finished to remove the notch that is the starting point of the fracture, and has a higher strength than the beam end where the design stress is large compared to the center of the beam. It is difficult to make an economical design that uses the steel material of the material or increases the thickness of the flange plate to increase the strength of the beam end.

  Moreover, in the column beam connection structure 70 in patent document 1, the rib plate welded to a beam becomes a comparatively big thing, and the welding line required in connection with this becomes long.

  Further, in the column-beam joint structure 80 in Patent Document 2, the cover plate 28 to be welded to the beam becomes relatively large, and accordingly, the required welding line becomes long. Further, the yielding portion of the notch 29 includes a welded portion of the cover plate 28 and the flange 3 of the beam. If the welded portion is defective, the notch 29 may be damaged.

  The present invention has been made in view of various points in the previous period, and the purpose of the present invention is to eliminate the need to greatly cut out the flange of the beam, and to effectively use the bending strength of the beam, as well as due to an earthquake or the like. An inexpensive method for manufacturing a column beam joint structure that can prevent ductile fracture and brittle fracture from occurring due to an external force and can maintain the desired strength of the beam, and a column beam joint structure Is to provide.

  One example of the column beam connection structure of the present invention is a column beam connection portion of a steel structure in which a column and a beam are bonded, and one end is bonded to a column surface in a substantially horizontal plane and the other end is a column surface. At least one first beam flange plate that is joined to a second beam flange plate facing the first plate, and the first beam flange plate and the second beam flange plate form a substantially vertical plane to form a web plate The first beam flange plate is joined and has a notch at a position away from the column surface, and the portion of the first beam flange plate located on the second beam flange plate side with respect to this notch is The second beam flange plate is wider than the second beam flange plate.

  According to the above-mentioned column beam connection structure, the first beam flange plate is manufactured from a single plate in which a notch is formed. Therefore, it is necessary to weld the reinforcing plates 23 and 24 like the column beam connection structure 60. There is no. In addition, since the first beam flange plate is joined to the second beam flange plate by welding, a higher strength steel material is used for the first beam flange plate or the thickness of the flange plate is increased. Economic design that increases the strength of the beam ends becomes easy. Here, the first and second beam flange plates and the web plate are made of a metal material such as a steel plate, formed into a beam by welding in a factory, and welded to a column when the steel frame is erected.

  Moreover, according to said column beam connection structure, a beam member becomes a built-up member and can adapt to larger member cross sections, such as a high-rise building. In addition, the notch (notch) can be manufactured at a lower cost, and the material and the cross section of the member can be changed at the end and center of the beam, so that economic design is possible.

  In the manufacturing method of the beam-column joint structure according to claim 1, at least one first plate is bonded to each of the column and beam flange so as to reinforce the beam-column connection portion of the column and the beam, At least one second plate is joined to a portion of the flange of the beam that is farther from the beam-to-column joint than the first plate, and the opposite ends of the joined first and second plates, respectively, At least one concave shape is formed by the side end face of the flange of the beam between the first and second plates.

  According to the manufacturing method of the column beam connection structure according to claim 1, it is not necessary to make a notch in the recessed shape. Accordingly, it is not necessary to grind the end face of the notch.

  3. The method of manufacturing a column beam connection structure according to claim 2, wherein at least one first rib plate is formed on each column and beam flange so as to reinforce the column and beam column beam connection portion. And at least one second rib plate is joined to each of the flange portions of the beam farther from the beam-to-column joint than the first rib plate in a substantially vertical plane, respectively. At least one indented shape is formed by the mutually opposing end portions of the first and second rib plates and the outer surface of the flange of the beam between the first and second rib plates.

  According to the manufacturing method of the column beam joint structure according to claim 2, it is not necessary to make a notch in the recessed portion. Accordingly, it is not necessary to grind the end face of the notch. Moreover, the rib plate welded to the beam becomes smaller, and the length of the welding line required for this is shortened.

  In the method for manufacturing a column-to-column connection structure according to claim 3, at least one first cover plate is provided with a substantially horizontal plane on each of the column and the flange of the beam so as to reinforce the column-to-column connection portion of the beam. In addition to joining, at least one second cover plate is joined to each of the flange portions of the beam farther from the beam-to-column joint than the first cover plate in a substantially horizontal plane, and each of the joined first covers And at least one cross-sectional defect portion formed by the mutually opposing ends of the second cover plate and the outer surface of the flange of the beam between the first and second cover plates.

  According to the method for manufacturing a column-beam joint structure according to claim 3, it is not necessary to make a notch in the cross-sectional defect portion. Accordingly, it is not necessary to grind the end face of the notch. Further, the cover plate to be welded to the beam becomes smaller, and the length of the welding line required for this is shortened. Furthermore, since the cross-sectional defect portion has no welded portion, there is no risk of damage due to a defect or the like in the welded portion.

  The other column beam connection structure of the present invention has a notch at a position apart from the column surface while being bonded to the column surface at one end in the column beam connection part of the steel structure in which the column and the beam are bonded. At least one first beam flange plate, at least one second beam flange plate joined at one end to the other end of the first beam flange plate, and first and second beam flange plates; Web plates being joined together. According to such a beam-to-column connection structure, the first beam flange plate is manufactured from a single plate in which a notch is formed. Therefore, it is necessary to weld the reinforcing plates 23 and 24 like the beam-to-column connection structure 60. There is no. In addition, since the first beam flange plate is joined to the second beam flange plate by welding, a higher strength steel material is used for the first beam flange plate or the thickness of the flange plate is increased. Economic design that increases the strength of the beam ends becomes easy. The first and second beam flange plates and the web plate are made of a metal material such as a steel plate, formed into a beam by welding in a factory, and welded to a column when constructing a steel frame.

  The beam-to-column connection structure according to claim 4 includes at least one first plate bonded to each of the column and beam flanges so as to reinforce the column and beam beam-column connection portion; At least one second plate that is joined to a portion of the flange of the beam that is farther from the beam-to-column joint than the plate, and first and second ends that face each other of the first and second plates At least one recess formed by the side end face of the flange of the beam between the plates.

  According to the beam-column joint structure of claim 4, it is not necessary to make a notch in the recess. Accordingly, it is not necessary to grind the end face of the notch.

  The beam-to-column connection structure according to claim 5 includes: at least one first rib plate that is bonded to each of the column and the flange of the beam so as to reinforce the beam-to-column connection portion of the column and the beam; At least one second rib plate that is joined to a portion of the flange of the beam that is further away from the column beam joint than the first rib plate, and the first and second rib plates that are opposite to each other And at least one recess formed by the outer surface of the flange of the beam between the second rib plates.

  According to the column beam connection structure of the fifth aspect, it is not necessary to make a notch in the recessed portion. Accordingly, it is not necessary to grind the end face of the notch. Moreover, the rib plate welded to the beam becomes smaller, and the length of the welding line required for this is shortened.

  The beam-to-column connection structure according to claim 6 includes at least one first cover plate bonded to each of the column and the flange of the beam so as to reinforce the beam-to-column connection portion of the column and the beam, At least one second cover plate joined to a portion of the flange of the beam farther from the column beam joint than the first cover plate, and the first and second end portions of the first and second cover plates facing each other. At least one cross-sectional defect portion formed by the outer surface of the flange of the beam between the second cover plates.

  According to the beam-column joint structure of the sixth aspect, it is not necessary to make a notch in the cross-sectional defect site. Accordingly, it is not necessary to grind the end face of the notch. Further, the cover plate to be welded to the beam becomes smaller, and the length of the welding line required for this is shortened. Furthermore, since the cross-sectional defect portion has no welded portion, there is no risk of damage due to a defect or the like in the welded portion.

  According to the present invention, it is possible to effectively use the bending strength of the beam by eliminating the need to greatly cut the flange of the beam, and at the same time, ductile fracture or brittle fracture is caused at the column beam joint due to external force due to an earthquake or the like. It is possible to provide an inexpensive method for manufacturing a beam-column joint structure and a beam-column joint structure that can prevent the occurrence of the beam and maintain a desired bending strength of the beam.

  Next, examples of embodiments of the present invention will be described in more detail based on preferred examples shown in the drawings. The present invention is not limited to these examples, and various improvements and design changes can be made without departing from the gist of the present invention.

(First embodiment)
In FIG. 1 to FIG. 5, in the column-beam joint structure 1 of this example, a column 2 a and a beam 2 are joined. One end of the first beam flange plate 5 forms a substantially horizontal plane and is joined to the column surface of the column 2a by welding at the column beam joint 2b. Further, the web (web plate) 4 of the beam 2 is joined to the column 2 a by a bolt 12 via a gusset plate 11. The beam 2 is a built-up H-shaped beam assembled by welding. The other end of the first beam flange plate 5 at the beam end is butt welded to one end of the second beam flange plate 5a at the beam center by a weld 6. The beam 2 forms a built-up H-shaped beam by joining the first and second beam flange plates 5 and 5a to the web 4 by a fillet weld 6a in a substantially vertical plane. The first and second beam flange plates 5 and 5a and the web 4 are preferably joined to each other so that the beam 2 is constructed by welding in a factory, and the thus constructed beam 2 is a steel frame. It is joined to the pillar 2a at the time of construction.

  When an external force generated in the beam 2 at the time of an earthquake is applied to the beam-column joint structure 1 of this example, the bending stress generated in the beam 2 is greatly generated in the beam-column joint 2b, and as the distance from the beam-column joint 2b increases. It becomes gradually smaller. Although a larger bending stress is applied to the beam-column joint 2b than the position separated from the beam-column junction 2b, in the beam-column joint structure 1 of the present example, the first beam flange plate While the width of 5 is reinforced widely, a notch (notch) 7 is formed at a position away from the column surface of the first beam flange plate 5, so that a ductile fracture occurs at the column beam joint 2b. Even if a large external force that can cause brittle fracture is applied, the yield hinge is formed by causing plastic deformation at the notch portion 7 before ductile fracture or brittle fracture occurs at the beam-column joint 2b. It has become so.

  Since the first beam flange plate 5 is cut with a notch 7 from the steel plate, it is not necessary to weld the reinforcing plate to the beam 2. Further, a steel plate made of a high strength material is used for the first beam flange plate 5 corresponding to the end portion of the beam having a high stress, and a steel plate made of a normal material is used for the second beam flange plate 5a corresponding to the center portion of the beam having a low stress. Can be used to reduce the amount of steel. Furthermore, since the notch amount of the first beam flange plate 5 constituting the notch portion 7 and the enlarged width of the flange at the column beam joint portion 2b can be freely changed, the degree of freedom in design is increased.

(Second Embodiment)
6 and 7, the column-beam joint structure 30 of this example includes a pair of joints that are joined to the pillar 2 a and the flange 3 of the beam 2 so as to reinforce the column-beam joint 2 b of the beam 2. Each of the first plate 15, the pair of second plates 16 joined to the portion of the flange 3 of the beam 2 farther from the column beam joint 2 b than the pair of first plates 15, and the plates 15 and 16, respectively. A recess 8 having a recess shape constituted by the end portions facing each other and the side end face of the flange 3 of the beam 2 between the plates 15 and 16 is provided. The plates 15 and 16 are preferably joined to the beam 2 by welding in a factory, and joined to the column 2a when constructing the steel frame. The end portions of the plates 15 and 16 can be smoothly finished by turning welding 14 as well as the tabs during welding can be removed by grinder finishing.

  According to the beam-column joint structure 30, as in the first embodiment, the yield hinge is formed by causing plastic deformation in the recess 8 before ductile fracture or brittle fracture occurs in the beam-column joint 2 b. Is possible. In the dent 8, there is no need to form a notch (notch processing is performed), and there is no need to grind the end face associated therewith.

(Third embodiment)
8 and 9, the column beam connection structure 40 of this example has a substantially vertical plane on each of the column 2 a and the flange 3 of the beam 2 so as to reinforce the column beam connection portion 2 b of the beam 2. The pair of first rib plates 17 to be joined together and the pair of the flanges 3 of the beam 2 that are further away from the beam-to-column joining portion 2b than the pair of first rib plates 17 are joined in a substantially vertical plane. A second rib plate 18, and a concave-shaped recess 9 constituted by the opposite ends of the rib plates 17 and 18 and the outer surface 3 a of the flange 3 of the beam 2 between the rib plates 17 and 18. is doing. The rib plates 17 and 18 are preferably joined to the beam 2 by welding in a factory, and joined to the column 2a when constructing the steel frame. The end portions of the rib plates 17 and 18 are smoothly finished by the turn welding 14. The flange 3 of the recess 9 may be provided with a notch 19 for inducing a yielding hinge.

  According to the beam-column joint structure 40, as in the first embodiment, a yield hinge is formed by causing plastic deformation in the recess 9 before ductile fracture or brittle fracture occurs in the beam-column joint 2b. Is possible. In the recess 9, there is no need to form a notch portion (no need to perform notch processing), and there is no need to grind the end face associated therewith. Further, the rib plates 17 and 18 to be welded to the beam 2 become smaller, and the length of the welding line required for this is shortened.

(Fourth embodiment)
10 and 11, the column beam connection structure 50 of this example forms a substantially horizontal plane on each of the column 2a and the flange 3 of the beam 2 so as to reinforce the column beam connection portion 2b of the beam 2a. A first cover plate 20 to be joined, and a second cover plate 21 to be joined in a substantially horizontal plane to a portion of the flange 3 of the beam 2 farther from the column beam joint 2b than the first cover plate 20 The cross-sectional defect part 10 comprised by the edge part which the cover plates 20 and 21 mutually oppose, and the outer surface 3a of the flange 3 of the beam 2 between the cover plates 20 and 21 is comprised. The cover plates 20 and 21 are preferably joined to the beam 2 by welding in a factory, and joined to the column 2a when constructing the steel frame. The end portions of the cover plates 20 and 21 are smoothly finished by the turn welding 14. A notch 22 for inducing a yielding hinge may be provided in the flange 3 of the cross-sectional defect site 10.

  According to this, similarly to the first embodiment, it is possible to form a yield hinge by causing plastic deformation at the cross-sectional defect site 10 before ductile fracture or brittle fracture occurs at the beam-column joint 2b. become. In the cross-sectional defect part 10, there is no need to form a notch (necessary to perform notch processing), and there is no need to grind the end face accompanying this. Further, the cover plates 20 and 21 to be welded to the beam 2 become smaller, and the length of the welding line required for this is shortened.

It is plane sectional explanatory drawing of the example of embodiment of this invention. Example 1 It is a vertical side explanatory view of the example shown in FIG. Example 1 FIG. 3 is an explanatory view taken along the line III-III of the example shown in FIG. 1. Example 1 It is IV-IV sectional view explanatory drawing of the example shown in FIG. Example 1 It is VV sectional view explanatory drawing of the example shown in FIG. Example 1 It is plane sectional explanatory drawing of the other example of embodiment of this invention. (Example 2) FIG. 7 is a vertical side view of the example shown in FIG. 6. (Example 2) It is a vertical side explanatory drawing of the other example of embodiment of this invention. (Example 3) FIG. 9 is an explanatory plan view of the example shown in FIG. 8. (Example 3) It is plane sectional explanatory drawing of the other example of embodiment of this invention. Example 4 FIG. 11 is a vertical side view of the example shown in FIG. 10. Example 4 It is a plane cross-section explanatory drawing of the example of the conventional column beam connection structure. It is vertical side explanatory drawing of the other example of the conventional column beam junction structure. It is plane cross-sectional explanatory drawing of the other example of the conventional column beam junction structure.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Column beam connection structure 2 Beam 2a Column 2b Column beam connection part 3 Flange 4 Web plate 5 1st beam flange plate 5a 2nd beam flange plate 7 Notch 8, 9 Recess 10 Cross-section defect part

Claims (6)

  At least one first plate is joined to each of the column and beam flanges to reinforce the column and beam column-to-beam joint, and at least one second plate is more than the first plate. The side end face of the flange of the beam between the first and second plates and the opposite ends of the first and second plates respectively joined to the beam flange portion away from the beam-to-column joint. A method of manufacturing a column beam joint structure in which at least one concave shape is formed.   At least one first rib plate is joined to each of the column and beam flanges in a substantially vertical plane so as to reinforce the column-beam joint of the column and the beam, and at least one second rib plate. Are connected to the flange portion of the beam farther from the beam-column joint than the first rib plate in a substantially vertical plane, and the end portions of the first and second rib plates that are joined to each other are respectively opposed to each other. And a column beam connection structure forming at least one indented shape formed by the outer surface of the flange of the beam between the first and second rib plates.   At least one first cover plate is joined to each of the column and beam flanges in a substantially horizontal plane so as to reinforce the column-beam joint of the columns and beams, and at least one second cover plate is attached. The first and second cover plates are joined to each other at a portion of the flange of the beam farther away from the beam-to-column joint than the first cover plate in a substantially horizontal plane, respectively. A method of manufacturing a column-beam joint structure that forms at least one cross-sectional defect portion constituted by an outer surface of a flange of a beam between the first and second cover plates.   At least one first plate joined to each of the column and beam flanges to reinforce the column and beam column beam joint, and a beam farther from the column beam junction than the first plate. By at least one second plate respectively joined to the flange part, respectively opposite ends of the first and second plates and the side end face of the flange of the beam between the first and second plates A beam-column joint structure comprising at least one recess configured.   At least one first rib plate joined to each of the column and beam flanges to reinforce the column and beam joints of the columns and beams, and more distant from the column beam joints than the first rib plates At least one second rib plate joined to a portion of the flange of the beam, the end of the first and second rib plates facing each other and the flange of the beam between the first and second rib plates A beam-column joint structure comprising at least one recess formed by an outer surface.   At least one first cover plate joined to each of the pillar and beam flanges to reinforce the column and beam joints of the columns and beams, and more distant from the column beam joints than the first cover plates At least one second cover plate joined to a portion of the flange of the beam, and the outer surface of the flange of the beam between the first and second cover plates and the opposite ends of the first and second cover plates, respectively And a beam-column joint structure comprising at least one cross-sectional defect portion constituted by:

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