Classifications

• • E—FIXED CONSTRUCTIONS
  • E04—BUILDING
  • E04C—STRUCTURAL ELEMENTS; BUILDING MATERIALS
  • E04C3/00—Structural elongated elements designed for load-supporting
  • E04C3/02—Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces
  • E04C3/04—Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces of metal
  • E04C3/06—Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces of metal with substantially solid, i.e. unapertured, web
  • E04C3/07—Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces of metal with substantially solid, i.e. unapertured, web at least partly of bent or otherwise deformed strip- or sheet-like material
• • E—FIXED CONSTRUCTIONS
  • E04—BUILDING
  • E04C—STRUCTURAL ELEMENTS; BUILDING MATERIALS
  • E04C3/00—Structural elongated elements designed for load-supporting
  • E04C3/30—Columns; Pillars; Struts
  • E04C3/32—Columns; Pillars; Struts of metal
• • E—FIXED CONSTRUCTIONS
  • E04—BUILDING
  • E04C—STRUCTURAL ELEMENTS; BUILDING MATERIALS
  • E04C3/00—Structural elongated elements designed for load-supporting
  • E04C3/02—Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces
  • E04C3/04—Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces of metal
  • E04C2003/0404—Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces of metal beams, girders, or joists characterised by cross-sectional aspects
  • E04C2003/0408—Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces of metal beams, girders, or joists characterised by cross-sectional aspects characterised by assembly or the cross-section
  • E04C2003/0413—Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces of metal beams, girders, or joists characterised by cross-sectional aspects characterised by assembly or the cross-section being built up from several parts
• • E—FIXED CONSTRUCTIONS
  • E04—BUILDING
  • E04C—STRUCTURAL ELEMENTS; BUILDING MATERIALS
  • E04C3/00—Structural elongated elements designed for load-supporting
  • E04C3/02—Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces
  • E04C3/04—Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces of metal
  • E04C2003/0404—Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces of metal beams, girders, or joists characterised by cross-sectional aspects
  • E04C2003/0408—Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces of metal beams, girders, or joists characterised by cross-sectional aspects characterised by assembly or the cross-section
  • E04C2003/0421—Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces of metal beams, girders, or joists characterised by cross-sectional aspects characterised by assembly or the cross-section comprising one single unitary part
• • E—FIXED CONSTRUCTIONS
  • E04—BUILDING
  • E04C—STRUCTURAL ELEMENTS; BUILDING MATERIALS
  • E04C3/00—Structural elongated elements designed for load-supporting
  • E04C3/02—Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces
  • E04C3/04—Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces of metal
  • E04C2003/0404—Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces of metal beams, girders, or joists characterised by cross-sectional aspects
  • E04C2003/0426—Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces of metal beams, girders, or joists characterised by cross-sectional aspects characterised by material distribution in cross section
  • E04C2003/043—Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces of metal beams, girders, or joists characterised by cross-sectional aspects characterised by material distribution in cross section the hollow cross-section comprising at least one enclosed cavity
• • E—FIXED CONSTRUCTIONS
  • E04—BUILDING
  • E04C—STRUCTURAL ELEMENTS; BUILDING MATERIALS
  • E04C3/00—Structural elongated elements designed for load-supporting
  • E04C3/02—Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces
  • E04C3/04—Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces of metal
  • E04C2003/0404—Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces of metal beams, girders, or joists characterised by cross-sectional aspects
  • E04C2003/0426—Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces of metal beams, girders, or joists characterised by cross-sectional aspects characterised by material distribution in cross section
  • E04C2003/0434—Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces of metal beams, girders, or joists characterised by cross-sectional aspects characterised by material distribution in cross section the open cross-section free of enclosed cavities
• • E—FIXED CONSTRUCTIONS
  • E04—BUILDING
  • E04C—STRUCTURAL ELEMENTS; BUILDING MATERIALS
  • E04C3/00—Structural elongated elements designed for load-supporting
  • E04C3/02—Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces
  • E04C3/04—Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces of metal
  • E04C2003/0404—Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces of metal beams, girders, or joists characterised by cross-sectional aspects
  • E04C2003/0443—Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces of metal beams, girders, or joists characterised by cross-sectional aspects characterised by substantial shape of the cross-section
  • E04C2003/0452—H- or I-shaped
• • E—FIXED CONSTRUCTIONS
  • E04—BUILDING
  • E04C—STRUCTURAL ELEMENTS; BUILDING MATERIALS
  • E04C3/00—Structural elongated elements designed for load-supporting
  • E04C3/02—Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces
  • E04C3/04—Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces of metal
  • E04C2003/0404—Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces of metal beams, girders, or joists characterised by cross-sectional aspects
  • E04C2003/0443—Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces of metal beams, girders, or joists characterised by cross-sectional aspects characterised by substantial shape of the cross-section
  • E04C2003/0465—Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces of metal beams, girders, or joists characterised by cross-sectional aspects characterised by substantial shape of the cross-section square- or rectangular-shaped

Definitions

• the present invention relates to a buckling stiffening structure of a box-shaped cross-section thin plate member.
• bars such as a vertical frame member and a horizontal frame member made of a thin lightweight plate steel used in a steel house, a house, a factory building, etc.
• the present invention relates to a buckling stiffening structure for a box-shaped thin plate member suitable as a light-like member.
• FIG. 23 A typical steel frame structure in steel houses is shown in Figure 23.
• the pillars, beams, joists and other vertical and horizontal frames built on the fabric foundation are mainly made of a sheet steel sheet with a thickness of 0.8 to 1.6 mm.
• the one formed by bending into a groove shape by roll forming (simply called groove steel) is used.
• a plurality of pillars 2, corner pillars 3, and vertical frames 4 constituting the first floor are erected from a lower frame runner 1 fixed by an anchor port on a fabric foundation (not shown).
• a head connection, an upper frame runner 5 and the like are provided at the upper end of the pillar 2, corner pillar 3, and vertical frame 4 constituting the first floor.
• a lintel 7 and a lintel support 8 are provided at the window opening 6 for the first floor.
• a roof truss 13 is attached to the upper frame runner 5 via a head joint 10, a locking stopper 1 1, a tilt stopper, a gusset plate 1 2, and a brace 9.
• Roof truss 1 3 Lower chord material (that is, ceiling joists) 1 4 Starting from the frame, the Tsumagoya frame frame 1 5 rises. 6, head Roll prevention 1 7 etc. are provided.
• Fig. 24 (B) the webs 21 of two ripped channel steels 18 are brought into contact with the back-to-back, and drill screws 2 2 are driven through both webs 21 and both
• the vertical member including the column 2 or corner column 3 or the vertical frame member in Fig. 2 3 or the horizontal member including the inclined member such as the beam or the truss member or the horizontal frame member.
• FIG. 23 Development of vertical frame materials (and vertical members) or horizontal frame materials (and horizontal members) for use in thin steel lightweight steel buildings on the first or second floor of steel houses, etc. as shown in Fig. 23
• Fig. 24 (B) As shown in Fig. 24 (B), as shown in Fig. 24 (B), the grooved steel with rips 1 8 can be assembled with many drill screws 2 2 and the assembly of the assembled H-shaped steel members 19 Since the side grooves or drill screws 2 2 etc. are exposed, problems in the appearance of the members have become apparent, and the need for a rectangular closed cross-section member 2 4 as shown in Fig. It is being advanced.
• the closed cross-section member 24 shown in Fig. 25 (A) is formed by bending a strip-shaped steel sheet into a box-shaped cross-section with a closed annular cross-section consisting of four sides 25 and a right corner portion 26. Formed and bent strips of thin steel sheets, both ends of which are seamed by caulking sections 27, column members (square steel) 2 vertical frame materials or roof frames 1 A rod-like box-shaped cross-section thin plate member 2 8 is formed. However, in the box-shaped member (square steel) 28 shown in Fig. 25 (A), the radius of curvature of the arc-shaped part of each corner part 26 is made smaller than twice the sheet thickness t. As shown in Fig.
• the outer width dimension b is the same as the above, whereas the outer width dimension b is less affected by the width dimension of each side.
• the ripped channel steel 1 8 is In the assembled H-section steel member 1 9 constructed by combining two, each flanged section steel with lip 1 8 flange part 2 9 width b Z 2 full width is an effective width, In the box-shaped cross-section in Fig.
• the effective dimension width is larger than the outer width dimension b. Since it becomes smaller, the ratio (width-thickness ratio) between the plate thickness t and the external width dimension b increases as a large factor.
• the plate thickness dimension can be set appropriately large, so that the above-mentioned problems do not occur, and a box made of thin plate members with a thickness t of 0.8 mm to l .6 mm. This is a problem peculiar to the cross-sectional thin plate member 28.
• the stiffening rib 3 1 is provided in the middle part of the plate element 30 constituting each side 25 as shown in FIG. 25 (B).
• FIG. 25 (B) See, for example, Japanese Patent Laid-Open No. 2 0 0 1 — 1 5 2 6 0 7 and Japanese Patent Laid-Open No. 2 0 0 1 — 3 2 9 6 5 6), or as shown in FIG. 25 (c)
• a method for improving the effective cross-sectional ratio p by corrugating the plate element 30 has been proposed. In the case of the structure shown in FIGS.
• stiffening ribs and corrugated plates may interfere with drill screw placement, or (2) stiffening
• the structure as described above increases the rigidity of the plate element 30 on each side 25, As a whole, the rigidity of the box-shaped cross-section thin plate member 28 can be increased to provide a stiffening structure against buckling. Disclosure of the invention
• the radial dimension R of the arc-shaped portion 3 2 of the corner portion 26 is defined to be twice the plate thickness t of the thin plate member (R-2 t).
• the corner portion 26 of the box-shaped cross-section thin plate member 28 is formed into a semicircular bent portion that is largely bent into an arc shape exceeding 2 t, which is twice the plate thickness t.
• the semicircular bent part (arc-shaped part 3 2) is closer to the center of the member, and the cross-sectional secondary moment of the entire member is reduced, so stiffening against buckling is achieved.
• the corner of the structure was not actively considered.
• the basic design philosophy of lowering the moment of inertia of the entire member is that, in the field of thin steel lightweight steel construction, some corners in the box-shaped thin plate member 2 8 2 6 About the box-shaped cross-section thin plate member 2 8 Forming a large arc-shaped stiffener at the corner of 8 and the dimensions of the arc-shaped stiffener at the corner It wasn't thought about digging.
• the bending buckling strength of the entire member that is, the secondary moment of the cross-section tends to decrease, and the arc-shaped
• the bending buckling strength of the entire member that is, the secondary moment of the cross-section tends to decrease
• the arc-shaped Alternatively, paying attention to the characteristics of changes in the effective cross-sectional area A e when the width of the straight stiffening section is changed, the dimensions of the stiffening section of the corner section and the allowable compressive stress F cr (N / mm 2 ) And the effective cross-sectional area A e (mm 2 ), focusing on the strength of the final member, the allowable compression resistance (A e • F cr) of the final member, Knowing that the value of area A e) X (allowable compressive stress F cr) draws a chevron diagram according to the size of the corner stiffener, the dimension of the corner stiffener It is found that the bending buckling rigidity of the box-shaped cross-section thin plate member can be increased efficiently by setting the
• the box-shaped cross-section thin plate member is a thin plate member having a thickness of 0.8 mm to l. 6 mm, a steel house, a house, a pillar member of a factory star, and the like, and a leg frame of an office desk. It can also be applied to the same structure composed of thin plates other than housing.
• the buckling stiffening structure of the box-shaped cross-section thin plate member of the first invention is the buckling stiffening structure of the box-shaped cross-section thin plate member, and the thickness of the plate is 0.
• 4mm to l .6 mm box-shaped cross-section thin plate members are formed by bending a thin steel plate into a box-shaped cross-sectional shape to form corner stiffeners that connect each side and adjacent sides.
• the two corner stiffeners have a width dimension D in the direction parallel to the side connected to the corner, which is more than twice the plate thickness of the thin plate member, and the external width dimension of the two sides connected at a part of the corner 1/3 of b or less of b, or 1/3 or less of the outer width of the short side, whichever one of the two sides connected at the corner is shorter Characterized in that it is that is sized corner stiffeners.
• the outer width dimension is the thickness of the thin plate member.
• the width D of the corner stiffener in the direction parallel to the side satisfies the following relations (2) and (3): A value having a small filling upper limit value is set as the width dimension D.
• the corner stiffening portion in the box-shaped cross-section thin plate member is linear or arcuate outside the member or The inside of the member has an arc-shaped cross-sectional shape.
• the box-shaped cross-section thin plate member excludes the corner stiffening portion in the box-shaped cross-section thin plate member
• Three of the four sides have U-shaped or V-shaped intermediate stiffening ribs in the cross section, and the remaining one side is joined by caulking.
• the caulking portion in the buckling stiffening structure of the box-shaped cross-section thin plate member according to the fourth invention, has an overlap thickness of 2 to 6 times the plate thickness dimension, and the plate It is characterized by having an overlap width of 5 to 15 times the thickness dimension.
• the box-shaped cross-section thin plate member in the buckling stiffening structure of the box-shaped cross-section thin plate member of any one of the first to fifth inventions, the box-shaped cross-section thin plate member is closed or partially released, As a whole, the cross-sectional shape is a 5-8 octagon.
• the box-shaped cross-section thin plate member in the buckling stiffening structure of the box-shaped cross-section thin plate member of any of the first to sixth inventions, is configured by combining a plurality of thin steel plate members. It is characterized by being.
• At least one corner stiffening portion has the same width dimension in the direction parallel to each side connected thereto. May be.
• box-shaped cross-section thin plate member may be a closed box-shaped cross-section member or a box-shaped cross-section member in which a part of the side is opened.
• column members made of box-shaped thin sheet members can be used for welding, drill screws, rivets, bonding, and other means. It may be.
• a dimension b between adjacent corner stiffening portions at intervals in the box-shaped cross-section thin plate member may be set so as to satisfy the following relational expressions (4) and (5) between the width dimension D of the corner stiffening portion and the outer width dimension b of the box-shaped cross-section thin plate member.
• FIG. 1 is an end view of a buckling stiffening structure for a box-shaped cross-section thin plate member having a corner stiffening portion according to a first embodiment of the present invention.
• FIG. 2 is an end view of a buckling stiffening structure of a box-shaped cross-section thin plate member having a corner stiffening portion according to a second embodiment of the present invention.
• FIG. 3 (A) is an end view of a buckling stiffening structure of a box-shaped cross-section thin plate member having a corner stiffening portion according to a third embodiment of the present invention.
• FIG. 3 (B) is an end view showing a modified form of the buckling stiffening structure of the box-shaped cross-section thin plate member having the corner stiffening portion of the third embodiment of the present invention.
• Fig. 4 shows the relationship between the width D of the corner stiffening part D and the allowable compressive stress F cr excluding the safety factor when the thickness of the plate-like member in the configuration shown in Fig. 1 is 1.6 mm.
• FIG. 4 shows the relationship between the width D of the corner stiffening part D and the allowable compressive stress F cr excluding the safety factor when the thickness of the plate-like member in the configuration shown in Fig. 1 is 1.6 mm.
• Fig. 5 shows the dimension D of the corner stiffening part and the effective cross-sectional area A at the end face of the box-shaped cross-section thin plate member when the plate thickness in the configuration shown in Fig. 1 is 1.6 mm. It is a diagram which shows the relationship with e.
• Fig. 6 shows the relationship between the width D of the corner stiffener and the allowable compressive strength when the plate-like member thickness in the configuration shown in Fig. 1 is 1.6 mm.
• (2) and (3) are satisfied, and (2) is a diagram when the maximum value is smaller.
• Figure 7 shows the relationship between the width D of the corner stiffening part and the allowable compressive stress F cr excluding the safety factor when the thickness of the plate-like member in the configuration shown in Figure 1 is 1.2 mm.
• Fig. 8 shows the dimension D of the corner stiffening part and the perforated cross-sectional area at the end face of the box-shaped cross-section thin plate member when the plate thickness in the configuration shown in Fig. 1 is 1.2 mm. It is a diagram which shows the relationship with Ae.
• FIG. 9 shows the relationship between the width D of the corner stiffening portion and the allowable compressive strength when the plate thickness of the plate-shaped member in the form shown in FIG. 1 is 1.2 mm. This is a diagram when Eqs. (2) and (3) are satisfied, and Eq. (3) has a smaller maximum value.
• FIG. 10 shows the relationship between the width D of the corner stiffening portion and the allowable compressive strength when the thickness of the plate-like member in the form shown in FIG. 1 is 0.8 mm.
• the equation (3) is a diagram when the maximum value is smaller.
• FIG. 11 is an end view of a buckling stiffening structure of a box-shaped cross-section thin plate member having a corner stiffening portion according to a fourth embodiment of the present invention.
• FIG. 12 is an end view of a buckling stiffening structure of a box-shaped cross-section thin plate member having a corner stiffening portion according to a fifth embodiment of the present invention.
• Fig. 13 (A) is an end view of a buckling stiffening structure of a box-shaped cross-section thin plate member having a corner stiffening portion according to the sixth embodiment of the present invention for explaining the position when caulking is fixed. It is.
• FIG. 13 (B) is an enlarged longitudinal front view showing a caulking fixing portion of a box-shaped cross-section member provided with a corner stiffening portion according to a sixth embodiment of the present invention.
• FIG. 14 is an end view of a buckling stiffening structure for a box-shaped cross-section thin plate member having a corner stiffening portion according to a seventh embodiment of the present invention.
• FIG. 15 is an end view of a buckling stiffening structure for a box-shaped cross-section thin plate member having a corner stiffening portion according to an eighth embodiment of the present invention.
• FIG. 16 is an end view of a buckling stiffening structure for a box-shaped cross-section thin plate member provided with corner supplementary portions according to a ninth embodiment of the present invention.
• FIG. 17 (A) is an end view of the buckling stiffening structure of the cross-sectional thin plate member having the corner stiffening portion according to the tenth embodiment of the present invention.
• FIG. 17 (B) is an end face of the buckling stiffening structure of the cross section type thin plate member having the corner stiffening portion of the first embodiment of the present invention.
• FIG. 18 is an end view of a buckling stiffening structure of a box-shaped cross-section thin plate member having a corner :: stiffening portion according to the first and second embodiments of the present invention.
• FIG. 19 is an end view of a buckling stiffening structure of a box-shaped cross-section thin plate member having a corner: stiffening portion according to the first to third embodiments of the present invention.
• FIG. 20 is an end view of a buckling stiffening structure of a box-shaped cross-section thin plate member having a stiffening portion :: stiffening portion according to a 14th embodiment of the present invention.
• FIG. 21 is an end view of a buckling stiffening structure of a box-shaped cross-section thin plate member having a corner: stiffening portion according to the fifteenth embodiment of the present invention.
• FIG. 22 shows the corners of the 16th embodiment of the present invention:
• Fig. 23 is a perspective view of the framework of a conventional steel house.
• Fig. 24 (A) is an end view showing an example of a conventional column member.
• Fig. 24 (B) is an illustration of another conventional column member.
• Fig. 25 (A) is an end view showing an example of a conventional column member.
• Fig. 25 (B) is an end view showing another example of a conventional column member.
• FIG. 25 (C) is an end view showing another example of a conventional column member.
• FIG. 25 (D) is an enlarged front view showing a caulked portion.
• FIG. 1 shows a first embodiment of a buckling and stiffening structure for a box-shaped cross-section thin plate member according to the present invention, which is a vertical frame made of a thin lightweight plate steel used in a steel house, a house, a factory building, and the like.
• 1 shows a first embodiment in which a buckling stiffening structure of the present invention is applied to a box-shaped cross-sectional thin plate member 33 suitable as a rod-shaped member such as a frame member and a horizontal frame member.
• the box-shaped cross-section thin plate member is formed by bending a thin steel plate with a thickness of 0.8 to 1.6 mm into a box-shaped cross-section by roll forming, and seaming both ends by caulking. It is formed between 40 mm and 120 mm. Also, a part of each corner of the four sides of this box-shaped cross-section thin plate member 3 3
• a buckling stiffening structure is formed by providing corner stiffening part 3 4 in 26.
• corner stiffening part 3 4 is formed at each corner portion 26 on four sides, but a corner stiffening portion 3 4 may be provided on at least one corner portion 26.
• the cross-sectional form of the box-shaped cross-sectional thin plate member 33 of each embodiment of the present invention is determined based on the following two viewpoints.
• the box-shaped cross-section thin plate member 3 3 is based on the octagonal cross section as described above. However, by adopting a pentagonal to octagonal cross-sectional shape with corner stiffening part 3 4, the secondary moment of section of the box-shaped cross-section thin plate member 3 3, that is, the overall bending buckling strength is Since it tends to be small, pay attention to the final member strength (ie, the product of effective cross-sectional area A e and allowable compressive stress F cr, member allowable compression resistance: A e ⁇ F cr) The width dimension D in the direction parallel to the side 25 of the corner stiffening portion 34 in FIG.
• the effective cross-sectional area (A e) of the plate element 30 in the box-shaped cross-section thin plate member 3 3 is the effective width indicated in the thin plate lightweight section steel notification (Ministry of Land, Infrastructure, Transport and Tourism H 1 3 1 6 4 1) Although it is determined based on the following formula that prescribes B e, it can also be calculated using the formula shown in overseas guidelines.
• the outer width dimension b of the box-shaped cross-section thin plate member 33 targeted in the invention is required to satisfy the following expression (1).
• the lower limit value of the width dimension D of the corner stiffening portion 34 in the direction parallel to the side 25 is determined by the above equation (8).
• the width dimension D of part 3 4 is set to the following range.
• the width D of the flat part of the corner stiffening part 3 4. is the dimension b between the corner stiffeners. If it is wider than the width of, the width D of the flat plate part.
• the out-of-plane bending stiffness of the part plate is the dimension between the corner stiffeners b. Since there is a concern that the strength of the member may be reduced due to the fact that it is smaller than the out-of-plane bending rigidity of the plate of the part,
• the width dimension D of the corner stiffening portion 34 may be set so as to satisfy both the conditions (2) and (3). That is, it is desirable that the maximum value of the corner width dimension D is equal to or smaller than the smaller value of the upper limit values of both the expressions (2) and (3).
• Figures 4 to 6 show the relationship between 2 ) and the effective area A e (mm 2 ) and the allowable compression resistance A e ⁇ F cr (k N).
• the allowable compressive stress F cr and effective cross-sectional area A e were calculated according to the above-mentioned notice.
• F is calculated as 2 8 ON / mm 2 as the design standard strength with reference to the Ministry of Land, Infrastructure, Transport and Tourism Notification No. 1 6 39 in 2001. The calculation may be made as appropriate based on the yield point.
• Fig. 4 shows the relationship between the width D of the corner stiffening part 34 and the allowable compressive stress F cr (N / mm 2 ) excluding the safety factor (without considering the safety factor). It can be seen that when the width D of the corner stiffening portion 34 is increased, the allowable compressive stress F cr decreases. This is the corner stiffener
• the present invention pays attention to such a tendency to increase / decrease in the effective cross-sectional area A e, while aiming to maximize the allowable capacity (allowable compression resistance) of the member, I want to get it.
• FIG. 6 shows the relationship between the width dimension D of the corner stiffening portion 34 and the allowable compression resistance (A e ⁇ F cr) of the box-shaped cross-section thin plate member 3 3.
• the allowable compression resistance (A e 'F c r) at this time is
• the allowable compression resistance (A e ⁇ F cr) of the box-shaped cross-section thin plate member 3 3 is maximized by setting the width dimension D of the corner stiffening portion 3 4 to 20 mm.
• the allowable compression resistance (A e-F cr) at this time is almost the same as that of the conventional assembled H-section steel 19 shown in Fig. 24 (B). It can be used as an alternative material.
• the width dimension D of the corner stiffening part 3 4 is 0 is the form shown in FIG. 25 (A).
• the width dimension D is zero (the position of the left vertical axis), that is, the form shown in FIG.
• the dimension D of the corner stiffening portion 3 4 is 3 mm to 30 mm.
• the width dimension D of the practical corner stiffening portion 34 may be, for example, 3 mm to L 0 mm.
• the corner stiffening portion 34 is a flat plate shape
• the corner stiffening The width of the side 25 of the intermediate part excluding the part 3 4 is reduced, and the rigidity of the side 25 of the intermediate part is relatively smaller than the rigidity of the corner stiffening part 3 4 Therefore, it is desirable that the dimension D of the corner stiffening portion 34 is not more than b / 3 of the outer width b.
• the rigidity of the corner stiffening part 34 is further increased by adopting the thickness of the thin plate member and the cross-sectional shape of the corner stiffening part 34 (circular cross section or corrugated cross section).
• the present invention although it is a steel box-shaped cross-section thin plate member 3 3, there is a corner stiffening portion 3 4, so that corners can be eliminated in the same manner as chamfering in a wooden member. Even if it collides with the cross-sectional thin plate member 3 3, there is no risk of injury, and the design of the box-shaped cross-sectional thin plate member 3 3 is enhanced, and the high-class feeling is enhanced even though it is a steel member. It is also possible to use the box-shaped cross-section thin plate member 3 3 so as to be exposed to the space. In addition, a cosmetic surface material is affixed as necessary.
• the form in which the straight corner stiffeners 34 arranged so as to intersect each side 25 are provided at the four corners of the rectangular cross-sectional shape.
• a corner-shaped stiffening part 3 4 for a box-shaped cross-section thin plate member 3 3 with a closed cross-section, or a box-shaped cross-section thin plate member 3 3 with a part open The rigidity may be increased, and will be specifically described in the following embodiment.
• the corner stiffening portion 34 and its width dimension D are the same as those in the above-described embodiment, and thus the same reference numerals are given and description thereof is omitted.
• the arc-shaped portion 35 having a center in the vicinity of intersecting on the extension line of each side 25 of the box-shaped cross-section thin plate member 3 3 and approaching the member center is formed on each side 2 Corner stiffeners connected to intersect 5 3
• the corner stiffening portion 34 is not limited to a linear shape, but may be an arcuate corner stiffening portion 34.
• the outer shape is a special shape, so it is possible to improve the design, including design, even though it is a steel member. Even though it is a member, it can also be used as a member placed indoors.
• the radius dimension r of the arcuate portion 3 5 connected to each side 2 5 is set to 2 t in the corner portion 2 6.
• a corner stiffening portion 34 having a radius that does not fall below is formed, and is smoothly connected to each side 25 connected to the corner portion 26.
• the radius dimension r of the circular arc-shaped part 35 may exceed 2 t, for example, the dimension D as in the above embodiment.
• the radius R of the arc-shaped portion 35 connected to each side 25 in the corner part 26 is made larger than that in Fig. 3 (A), and the corner portion is compensated.
• the radial dimension R of the arcuate part 35 may be greater than 2 t, for example, a radial dimension larger than the width dimension D.
• the form of the box-shaped cross-section thin plate member 3 3 having the corner stiffening part 3 4 according to the present invention can be various. This will be described with reference to the following. Moreover, the same code
• a box-shaped cross-sectional thin plate member 33 having an open cross-sectional shape in which the middle part of the right side 25 is opened, and other configurations are the same as those in the above-described embodiment.
• one of the box-shaped cross-section thin plate members 3 3 The middle part of the side 25 may be an open part 3 6.
• the manufacture is easy. Further, it is suitable for the case where the box-shaped cross-section thin plate member 33 is used as a column member and another flange member or the like is inserted and joined from the open portion 36.
• the box-shaped cross-section thin plate member 33 has a lateral outer width dimension of b / 2 and a vertical outer width dimension of b.
• the lateral width dimension is small, b / 2
• the width dimension D of the corner stiffening part 3 4 is the dimension b of the short side 25 of this part b.
• the width D of the corner stiffening part 3 4 should be D ⁇ (b 2) / S b Z e.
• a caulking portion 2 7 is provided to close the cross section.
• the position may be provided at an appropriate middle position of the outer width dimension b.
• the caulking fixing structure can be folded inwardly so that one end is folded inwardly in a U-shape, and the other end is folded in an outwardly symmetrical inverted U-shape.
• a conventionally well-known structure may be used that is folded and overlapped so that the U-shaped tip portions are wound together and fixed by caulking.
• the position of the caulking part can be changed as appropriate based on construction reasons. That is, it is not limited to the intermediate portion of the outer width dimension b, and may be caulked and joined at a plurality of positions.
• an intermediate stiffening rib 31 having a U-shaped cross section extending in the longitudinal direction of the member is connected to the middle portion of the side 25 as a unit.
• the corner stiffening portion 3 4 of the present invention is provided and the stiffening rib 3 1 is provided at the center of each side 25, a more box-shaped cross-section type
• the rigidity against buckling of the thin plate member 33 can be increased.
• FIG. 18 it is of course possible to employ a configuration in which intermediate stiffening ribs 31 having a U-shaped cross section and caulking 27 are mixed. That is, in FIG.
• intermediate stiffening ribs 31 having a U-shaped or V-shaped cross section are provided on three of the four sides excluding the corner stiffening portion of the box-shaped cross-section thin plate member. On the remaining side, a caulking portion 27 is formed and caulked and joined.
• the shape of the caulking portion 27 is not particularly limited, but for example, it can be a shape as shown in FIG. 13 (B).
• the overlap thickness C t (mm) of the caulking portion 27 is not less than twice the plate thickness dimension t (mm) of the plate element (thin plate) 30 and the overlap width Cw is the plate element (thin plate). It is preferable to be at least 5 times the thickness t (mm) of 30.
• the thickness of the caulking part 2 7 is more than 6 times the thickness t of the plate element (thin plate) 30 and the overlap width Cw is 15 times the thickness t of the plate element 30. Even if the steel material exceeds this value, the stiffening ability per unit weight of steel (thin plate) will be reduced.
• the overlap thickness C t (mm) of the caulking portion is not less than 2 times and not more than 6 times (2 t to 6 t) the plate thickness dimension t (mm) of the plate element (thin plate), and the overlap width Cw (mm ) Is preferably not less than 5 times and not more than 15 times (5 t to l 5 t) of the plate thickness dimension (thickness) of the plate element (thin plate).
• the overlapping thickness of the caulking portion and the width of the overlapping portion are within the above range.
• the caulking part itself can exhibit substantially the same stiffening ability as that of the intermediate stiffening rib 3 1, and it is possible to obtain a box-shaped cross-section thin plate structure member with excellent structural performance, productivity and economy. it can.
• the caulking portion is formed on one side where the intermediate stiffening rib is not provided among the four sides excluding the corner stiffening portion of the box-shaped cross-section thin plate structure member.
• the position may be anywhere on this side, but it is preferably provided in correspondence with the position of the intermediate stiffening rib formed in the middle part of the other three sides.
• the present invention determines the cross-sectional shape of the box-shaped cross-section thin plate member 33 formed from a thin steel plate based on a consistent technical idea, and forms the cross-sectional shape of the box-shaped cross-section thin plate member 33.
• the bonding method bonding position, or the number of bonding points. Therefore, a part of thin steel rice shown in Fig. 19 (in the case shown, both ends of the thin steel plate) is overlapped and joined by joining means such as welding, drill screws, rivets, and adhesives.
• a plurality of thin steel plate members are provided with a corner stiffened portion grooved steel 3 8 having a corner stiffened portion 3 4 formed from a thin steel plate.
• box-shaped cross-section thin plate member 3 3 or a plurality of joint portions 37 is also included in the scope of the present invention. In this way, manufacturing a box-shaped cross-section thin plate member 3 3 with a plurality of thin steel plate members increases the number of parts compared with the case of manufacturing with a single thin steel plate, but the advantage of easy manufacture There is.
• the flange 4 2 tip of the grooved steel with corner stiffening portion 38 is overlapped (however, the tip of the flange 42 located inside is bent so as to be displaced inward. )
• the form shown in FIG. 21 is a grooved steel with a lip having a corner stiffening portion.
• Member 3 3 3.
• the box with the corner stiffening part 3 4 mentioned above This is the same as the case of manufacturing the cross-sectional thin plate member 33.
• box-shaped cross-section thin plate member 3 3 may be formed by butt-welding or fillet welding at both ends of a member formed of a thin steel plate.
• the box-shaped cross-section thin plate member 3 3 is filled with foaming resin such as urethane foam or other resin as a filler 4 1.
• foaming resin such as urethane foam or other resin as a filler 4 1.
• the rigidity or thermal insulation of the steel may be increased.
• the corner stiffening portion 34 of the present invention may be applied to the three locations, and in this case, the number of bent portions is reduced, so that the cost of roll forming equipment is reduced. Can do. Further, the side with the corner stiffening portion 34 may be arranged on the indoor side or the exposed side. From such a point of view, the form shown in FIG. 16 is a form in which corner stiffening portions 34 are provided at two diagonal positions in the box-shaped cross-sectional thin plate member 33.
• FIG. 17 (A) shows a form in which the corner stiffening portion 3 4 of the present invention is formed at one corner portion 26 of the box-shaped cross-section thin plate member 3 3.
• FIG. 17 (B) the width dimension D of the corner stiffening portion 34 is increased, and the box-shaped cross-section thin plate member 33 has an octagonal shape.
• the corner stiffening portion 34 As described above, as a cross-sectional form of the corner stiffening portion 34, for example, as shown in FIG. 2, the cross-sectional arc shape approaches the central portion of the member, and the center of the circular arc is formed outside the member. Having corner reinforcements 3 4 as each side 2 5 may be refracted to 5 or, conversely, as shown in FIG. 3, a corner having a circular arc cross-section that separates toward the center of the member and has the center of the arc inside the member.
• the reinforcing part 34 may be an arcuate corner stiffening part 34 that is refracted or smoothly connected to each side 25, and although not shown, these forms may be combined. Further, the corner reinforcing portion 34 may be wave-shaped.
• a square box shape made of a square or a rectangle is used as the base, and the four corners are formed as corner stiffening parts.
• the present invention is also applicable to various square box cross-section members. can do.
• the embodiment has been described in which the size of the corner stiffening portion 34 is the same as the width D of the corner stiffening portion 34 in each side 25 direction connected to the corner portion 26.
• the width dimension D of the corner stiffening portion 34 in the direction of each side 25 connected to the corner portion 26 may be different. Therefore, various modifications other than those shown are possible.
• the width D of the corner stiffening portion in the box-shaped cross-section thin plate member is set larger than the conventional case, the width D of the corner stiffening portion is set within a predetermined range.
• the effective cross-sectional area can be increased, and the bending buckling rigidity of the box-shaped cross-section thin plate member can be increased.
• the width dimension D of the corner stiffening portion in the box-shaped cross-section thin plate member is set larger than the conventional case, the width dimension D of the corner stiffening portion is kept within a predetermined range.
• the present invention can be applied in the range of the plate thickness of 0.4 mm to l.6 mm, and preferably the plate thickness of 0.8 mm to l.6 mm.

Landscapes

• Engineering & Computer Science (AREA)
• Architecture (AREA)
• Civil Engineering (AREA)
• Structural Engineering (AREA)
• Rod-Shaped Construction Members (AREA)
• Body Structure For Vehicles (AREA)

Priority Applications (2)

Applications Claiming Priority (2)

Publications (1)

Family

ID=38655629

Family Applications (1)

Country Status (5)

Families Citing this family (17)

Citations (4)

Family Cites Families (6)

• 2006
  • 2006-04-26 JP JP2006122439A patent/JP4724591B2/ja active Active
• 2007
  • 2007-04-24 KR KR1020087025648A patent/KR101156202B1/ko active IP Right Review Request
  • 2007-04-24 CN CN2007800145085A patent/CN101426987B/zh active Active
  • 2007-04-24 WO PCT/JP2007/059348 patent/WO2007126109A1/ja active Application Filing
  • 2007-04-24 TW TW096114416A patent/TWI337639B/zh active

Patent Citations (4)

Non-Patent Citations (1)

Also Published As

Similar Documents

Legal Events