US20120186191A1 - Rolled h-section steel - Google Patents

Rolled h-section steel Download PDF

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Publication number
US20120186191A1
US20120186191A1 US13/261,127 US201013261127A US2012186191A1 US 20120186191 A1 US20120186191 A1 US 20120186191A1 US 201013261127 A US201013261127 A US 201013261127A US 2012186191 A1 US2012186191 A1 US 2012186191A1
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Prior art keywords
rolled
breadth
web
thickness
flange
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Tadayoshi Okada
Ichiro Takeuchi
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Nippon Steel Corp
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Individual
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Publication of US20120186191A1 publication Critical patent/US20120186191A1/en
Assigned to NIPPON STEEL & SUMITOMO METAL CORPORATION reassignment NIPPON STEEL & SUMITOMO METAL CORPORATION MERGER (SEE DOCUMENT FOR DETAILS). Assignors: NIPPON STEEL CORPORATION
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    • 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
    • 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
    • E04C2003/0434—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

Definitions

  • the present invention relates to a rolled H-section steel that directly supports a floor slab or roof floor slab, and is applied to a small beam that is not directly connected to a pillar, a beam that is used within an elastic design range, and the like.
  • a rolled H-section steel for a pillar in which the web thickness to flange thickness ratio is 1.2 to 4, and reinforcement by a doubler plate in a pillar-to-beam joint panel, an oblique stiffener, or the like (for example, refer to Patent Document 2) can be omitted.
  • a rolled H-section steel for a pillar in which the web thickness to flange thickness ratio is 1.1 to 2.0, and reinforcement by a horizontal stiffener at a beam flange joining position in a pillar-to-beam joint, a doubler plate in a panel, an oblique stiffener, or the like can be omitted (for example, refer to Patent Document 3).
  • a thin-web rolled H-section steel in which the web thickness to flange thickness ratio is less than or equal to 0.5, and concavo-convex are formed at predetermined intervals in a web in order to prevent a web flapping phenomenon during rolling (for example, refer to Patent Document 4).
  • a thin-web rolled H-section steel in which the web thickness to flange thickness ratio is less than or equal to 0.5, and at least one protrusion reinforcing rib is provided over the longitudinal total length of only one lateral surface of a web in order to prevent a web flapping phenomenon during rolling for example, refer to Patent Document 5.
  • the flange breadth-thickness ratio and the web breadth-thickness ratio are specified in a relatively small numerical range (the upper limit of the flange breadth-thickness ratio is set to 10.0 and the upper limit of the web breadth-thickness ratio is set to 56.6, according to JIS, in a case where a major application is a beam and the side-height ratio is in a range of 0.77 or less) that is said to have a deformation capacity.
  • the web thickness to flange thickness ratio of a rolled H-section steel for a beam is specified in a relatively small numerical range (the upper limit of the web thickness to flange thickness ratio is set to 0.75, in a case where a major application is a beam and the side-height ratio is in a range of 0.77 or less) as being specified in JIS G 3192.
  • the shape of the rolled H-section steel is standardized in respective countries including the U.S., Britain, Europe, and Japan.
  • various rolled H-section steels described in JIS G 3192 are known.
  • the web breadth-thickness ratio is in a range of 8.0 to 56.6.
  • FIGS. 1 and 4 are graphs showing the horizontal axis as the flange breadth-thickness ratio (B/(2 ⁇ t 2 )) and showing the vertical axis as the web breadth-thickness ratio ((H ⁇ 2 ⁇ t 2 )/t 1 ). Additionally, the various conventional rolled H-section steels shown in Table 1 are plotted and shown in FIGS. 2 and 5 with the horizontal axis as the side-height ratio (B/H) and the vertical axis as the web thickness to flange thickness ratio (t 1 /t 2 ).
  • the major application of rolled H-section steels in which the side-height ratio is in a range (marketed in Japan as a small-breadth series or middle-breadth series of rolled H-section steels regarding the flange breadth of rolled H-section steel) of 0.77 or less can be classified into a beam
  • the major application of rolled H-section steels in which the side-height ratio is in a range (marketed as a large-breadth series of rolled H-section steels regarding the flange breadth of rolled H-section steel) exceeding 0.77 can be classified into a pillar or a brace.
  • Height ⁇ Side (H ⁇ B) (unit: mm): 150 ⁇ 100, 200 ⁇ 150, 250 ⁇ 175, 300 ⁇ 200, 350 ⁇ 250, 400 ⁇ 300, 450 ⁇ 300, 500 ⁇ 300, 600 ⁇ 300, 700 ⁇ 300, 800 ⁇ 300, and 900 ⁇ 300 (mm) are middle-breadth series, and the height (H) and the side (B) that has the same dimensions are large-breadth series, and the others are small-breadth series.
  • the flange breadth-thickness ratio is in a range of 3.1 to 10.0
  • the web breadth-thickness ratio is in a range of 17.2 to 56.6
  • the web thickness to flange thickness ratio is in a range of 0.53 to 0.75.
  • the reason why the flange breadth-thickness ratio is a relatively small numerical range of 17.2 to 56.6 when the web breadth-thickness ratio is in a range of 3.1 to 10.0 is because, if the ratio of the breadth to thickness of a plate element that constitute a member section is large, local buckling is caused in a portion that receives a compressive force, and the proof stress of the member section declines and a required plastic deformation capacity is no longer obtained.
  • various rolled H-section steels that are standardized in ASTM (American Society for Testing and Materials), BS (British Standards), and EN (European Standard) are divided into various rolled H-section steels in which the side-height ratio (B/H) is in a range of 0.77 or less and various rolled H-section steels in which the side-height ratio (B/H) exceeds 0.77, and the upper limits of the flange breadth-thickness ratio, web breadth-thickness ratio, and web thickness to flange thickness ratio (t 1 /t 2 ) of the various rolled H-section steels in which the side-height ratio (B/H) is in a range of 0.77 or less are shown in FIGS. 6 to 11 for close study.
  • FIGS. 6 and 7 as for the various rolled H-section steels that are standardized in ASTM (American Society for Testing and Materials), the various rolled H-section steels (rolled H-section steels belonging to the middle breadth or the small breadth) in which the side-height ratio (B/H) is in a range of 0.77 or less are plotted and shown with open circle marks, and the various rolled H-section steels in which the side-height ratio (B/H) exceeds 0.77 are plotted and shown with X marks.
  • a table of the various rolled H-section steels that are plotted and shown in FIGS. 6 and 7 and are standardized in ASTM (American Society for Testing and Materials) is omitted.
  • FIG. 6 is a graph plotting and showing the various rolled H-section steels that are standardized in ASTM, with the horizontal axis as the flange breadth-thickness ratio (B/(2 ⁇ t 2 )) and the vertical axis as the web breadth-thickness ratio ((H ⁇ 2 ⁇ t 2 )/t 1 ). It can be seen from this drawing that, in the rolled H-section steels that are shown with open circles and belong to the middle breadth or the small breadth, the upper limit of the flange breadth-thickness ratio is 9.4, and the upper limit of the web breadth-thickness ratio is 63.5.
  • the various rolled H-section steels are plotted and shown in FIG. 7 with the horizontal axis as the side-height ratio (B/H) and the vertical axis as the web thickness to flange thickness ratio (t 1 /t 2 ). It can be seen from this graph that, in the rolled H-section steels that are shown with open circles and belong to the middle breadth or the small breadth, the upper limit of the side-height ratio (B/H) is 0.72, and the upper limit of the web thickness to flange thickness ratio (t 1 /t 2 ) is 0.82.
  • FIGS. 8 and 9 as for the various rolled H-section steels that are standardized in BS (British Standards), the various rolled H-section steels (rolled H-section steels belonging to the middle breadth or the small breadth) in which the side-height ratio (B/H) is in a range of 0.77 or less are plotted and shown with open circle marks, and the various rolled H-section steels in which the side-height ratio (B/H) exceeds 0.77 are plotted and shown with X marks.
  • a table of the various rolled H-section steels that are plotted and shown in FIGS. 8 and 9 and are standardized in BS (British Standards) is omitted.
  • FIG. 8 is a graph plotting and showing the various rolled H-section steels that are standardized in BS, with the horizontal axis as the flange breadth-thickness ratio (B/(2 ⁇ t 2 )) and the vertical axis as the web breadth-thickness ratio ((H ⁇ 2 ⁇ t 2 )/t 1 ). It can be seen from this drawing that, in the rolled H-section steels belonging to the middle breadth or the small breadth, the upper limit of the flange breadth-thickness ratio is 8.6, and the upper limit of the web breadth-thickness ratio is 63.3.
  • FIG. 9 is a graph shown by plotting the various rolled H-section steels that are standardized in BS (British Standards) with the horizontal axis as the side-height ratio (B/H) and the vertical axis as the web thickness to flange thickness ratio (t 1 /t 2 ). It can be seen from this graph that, in the rolled H-section steels that are shown with open circles and belong to the middle breadth or the small breadth, the upper limit of the side-height ratio (B/H) is 0.66, and the upper limit of the web thickness to flange thickness ratio (t 1 /t 2 ) is 0.86.
  • BS Backbone Standard
  • FIGS. 10 and 11 as for the various rolled H-section steels that are standardized in EN (European Standard), the various rolled H-section steels (rolled H-section steels belonging to the middle breadth or the small breadth) in which the side-height ratio (B/H) is in a range of 0.77 or less are plotted and shown with open circle marks, and the various rolled H-section steels in which the side-height ratio (B/H) exceeds 0.77 are plotted and shown with X marks.
  • a table of the various rolled H-section steels that are plotted and shown in FIGS. 10 and 11 and are standardized in EN (European Standard) is omitted.
  • FIG. 10 is a graph plotting and showing the various rolled H-section steels that are standardized in EN (European Standard), with the horizontal axis as the flange breadth-thickness ratio (B/(2 ⁇ t 2 )) and the vertical axis as the web breadth-thickness ratio ((H ⁇ 2 ⁇ t 2 )/t 1 ). It can be seen from this drawing that, in the rolled H-section steels belonging to the middle breadth or the small breadth, the upper limit of the flange breadth-thickness ratio is 11.1, and the upper limit of the web breadth-thickness ratio is 58.0. Additionally, the various rolled H-section steels that are standardized in EN (European Standard) is plotted and shown in FIG.
  • EN European Standard
  • the number of small beams to be used is large compared to the number of large beams, if the weight per beam can be reduced without degrading the required cross-sectional performance, it is possible to greatly contribute to the reduction of the cost of a main body of a structure even if the cost reduction per beam is small.
  • the unit price of the beam can be reduced by about 10%. Therefore, not only can the cost of the main body of a structure be reduced markedly, but also the weight of the structure can be reduced, and the burden of a pillar becomes smaller to the extent that the weight of the structure is reduced. This also can contribute to improvement in the earthquake-proof performance of a structure.
  • a rolled H-section steel which may be made lightweight for a small beam and which does not degrade the cross-sectional performance.
  • the object of the invention is to provide a rolled H-section steel that is advantageous for solving the above problems.
  • H-section steel having a web and flanges.
  • the rolled H-section steel satisfies the following Expression (1) when H is the height of the rolled H-section steel, and B is the breadth of the flanges; the tensile strength is 400 to 510 N/mm 2 , the rolled H-section steel satisfies the following Expressions (2) and (3) when t 2 is the plate thickness of the flanges, and the design yield stress of a steel material of the rolled H-section steel is F(N/mm 2 ).
  • the rolled H-section steel described in the above (a) may satisfy the following Expression (4) when the plate thickness of the web is t 1 .
  • the flange breadth-thickness ratio of the rolled H-section steels belonging to the small breadth or the middle breadth in the major countries can be specified easily and the cross-sectional shape of the rolled H-section steel can be specified.
  • this rolled H-section steel can be reduced more than the conventional rolled H-section steels specified in major countries such as the U.S., Great, Europe, or Japan.
  • the cross-sectional performance of this rolled H-section steel can be kept greater than or equal to that of corresponding rolled H-section steels in the these countries. Accordingly, according to this rolled H-section steel, in all the countries of the world including the major countries, dimensions can be easily set and applied.
  • the flange breadth-thickness ratio (B/(2 ⁇ t 2 )) with the flange breadth B and the plate thickness t 2 of the flanges in the rolled H-section steel may be set to the range of the above Expression (2), even if the design yield stress F of a steel material to be used for this rolled H-section steel changes, the flange breadth-thickness ratio (B/(2 ⁇ t 2 )) of the rolled H-section steel can be set easily.
  • the dimensions of the H-section steel are easily set from the relationship between the height H of the rolled H-section steel, the breadth B of the flanges, the plate thickness t 2 of the flanges, and the design yield stress F (N/mm 2 ) of the steel material. Therefore, the cross-sectional area is reduced without reducing the cross-sectional performance compared to conventional rolled H-section steels, and a rolled H-section steel with a new dimension or shape with reduced weight can be provided.
  • the web breadth-thickness ratio ((H ⁇ 2 ⁇ t 2 )/t 1 ) of the rolled H-section steel can be set to a predetermined range from the relationship between the height H of the H-section steel, the plate thickness t 1 of the web, the plate thickness t 2 of the flanges, and the design yield stress F (N/mm 2 ) of the steel material.
  • the weight of a steel material can be reduced without reducing the cross-sectional performance compared to conventional well-known rolled H-section steels, and a rolled H-section steel with a new dimension or shape can be provided.
  • the weight per beam can be reduced more than that of conventional H-section steels by about 10%.
  • the cost per rolled H-section steel can be reduced, and this can also contribute greatly to reduction of the cost of a structure using this rolled H-section steel.
  • the unit price of the small beam can be reduced by about 10%. Therefore, not only can the construction cost of a structure be markedly reduced, but also the weight of the structure can be reduced due to the weight reduction of the small beam, and the earthquake-proof performance can be improved.
  • the cross-sectional area can be reduced by about 10% more than conventional rolled H-section steels, and it is possible to provide a small beam having a cross-sectional performance that is greater than or equal to conventional cross-sectional performance.
  • the cross-sectional secondary moment can be improved by 15% or more to a maximum of about 60%, and the section modulus is improved, so that at least the section modulus is the same as before, and the best the section modulus achieves improvement of 15%.
  • the weight per rolled H-section steel can be reduced by about at least 5% or more and a maximum of about 15% more than conventional products, and the cost per one rolled H-section steel can be reduced.
  • the weight of a small beam can be reduced by about at least 5% or more and a maximum of 15%, without reducing the earthquake-resistent performance of the small beam.
  • the unit price of the small beam can be reduced by about 5% or more and up to about 15%. Therefore, not only can the cost of a structure be markedly reduced, but also the weight of the structure can be reduced due to the weight reduction of the small beam, and the earthquake-resistent performance can be improved.
  • This rolled H-section steel is optimal to a rolled H-section steel for a small beam with little weight burden, weight can be reduced by about at least 5% or more and about a maximum of 15% more than conventional rolled H-section steels, and a small beam having the cross-sectional performance that is greater than or equal to conventional cross-sectional performance can be provided.
  • the cross-sectional secondary moment can be improved by 5% or more and a maximum of about 65%, and the section modulus is improved so that at least the section modulus is the same as before, and the best the section modulus achieves improvement of 20%.
  • FIG. 1 is a graph showing the relationship between a web breadth-thickness ratio and a flange breadth-thickness ratio in various rolled H-section steels related to one embodiment of the invention and various rolled H-section steels according to JIS.
  • FIG. 2 is a graph showing the relationship between a web thickness to flange thickness ratio and a side-height ratio in the various rolled H-section steels related to this embodiment and the various rolled H-section steels according to JIS.
  • FIG. 3 is a view showing the representative dimensions of parts of a rolled H-section steel and is an outline view as seen in a cross-section perpendicular to a longitudinal direction of the beam.
  • FIG. 4 is a graph showing the relationship between a web breadth-thickness ratio and a flange breadth-thickness ratio in the various rolled H-section steels according to JIS.
  • FIG. 5 is a graph showing the relationship between a web thickness to flange thickness ratio and a side-height ratio in the various rolled H-section steels according to JIS.
  • FIG. 6 is a graph showing the relationship between a web breadth-thickness ratio and a flange breadth-thickness ratio in various rolled H-section steels according to ASTM.
  • FIG. 7 is a graph showing the relationship between a web thickness to flange thickness ratio and a side-height ratio in the various rolled H-section steels according to ASTM.
  • FIG. 8 is a graph showing the relationship between a web breadth-thickness ratio and a flange breadth-thickness ratio in various rolled H-section steels according to BS.
  • FIG. 9 is a graph showing the relationship between a web thickness to flange thickness ratio and a side-height ratio in the various rolled H-section steels according to BS.
  • FIG. 10 is a graph showing the relationship between a web breadth-thickness ratio and a flange breadth-thickness ratio in the various rolled H-section steels according to EN.
  • FIG. 11 is a graph showing the relationship between a web thickness to flange thickness ratio and a side-height ratio in the various rolled H-section steels according to EN.
  • FIG. 3 the representative dimensions of parts in a rolled H-section steel 1 of the present embodiment and a rolled H-section steel 2 of a conventional example is shown in FIG. 3 .
  • Reference sign H represents the height (mm) of an H-section steel 1 (2)
  • reference sign B represents the length (mm) of a side that is the flange breadth of H-section steel 1 or 2
  • reference sign t 1 represents the thickness (mm) of a web 3
  • reference sign t 2 represents the thickness (mm) of flanges 4
  • reference sign r represents the curvature radius R (mm) of inner corners between the web 3 and the flanges 4 .
  • the relationship between the height H of the H-section steel 1 and the length B (hereinafter, the length of the side is simply referred to as a side) of a side that is the flange breadth in the rolled H-section steel of the present embodiment satisfies the following Expression (1) similarly to the conventional case.
  • the reason why the relationship between the height H and the length B of the side that is the flange breadth in the rolled H-section steel 1 is specified is the same as the above-described reason in conventional products. That is, whether a side-height ratio B/H that is the ratio of the height H and the length B of the side that is the flange breadth in the rolled H-section steel 1 is either less than 0.77 or greater than or equal to 0.77 depending on the applications of the beam.
  • the present embodiment since the rolled H-section steel is mainly used as a pillar when this side-height ratio B/H exceeds 0.77, and the rolled H-section steel is mainly used as a beam when the side-height ratio B/H has a middle breadth or small breadth of 0.77 or less, the present embodiment has also adopted such a practical index.
  • the rolled H-section steel to be targeted in the present embodiment is a rolled H-section steel that is mainly used as a beam in which the side-height ratio B/H falls within 0.77 or less, and the tensile strength of a steel is 400 to 510 N/mm 2 (the design yield stress F of the steel material is 235 N/mm 2 to 275 N/mm 2 ).
  • the targeted rolled H-section steel is a rolled H-section steel made of steel materials which are equivalent to SS400 (tensile strength is 400 N/mm 2 to 510 N/mm 2 ) in JIS G 3101, SM400A, B, C (tensile strength is 400 N/mm 2 to 510 N/mm 2 ) in JIS G 3106, and SN400A, B, and C (tensile strength is 400 N/mm 2 to 510 N/mm 2 ) in JIS G 3136.
  • SS400 tensile strength is 400 N/mm 2 to 510 N/mm 2
  • JIS G 3106 JIS G 3106
  • SN400A, B, and C tensile strength is 400 N/mm 2 to 510 N/mm 2
  • the rolled H-section steel of the present embodiment is a rolled H-section steel to be used in the elastic range thereof.
  • the rolled-H-section steel is used as a small beam, the rolled H-section steel remains in use within the elastic range. Therefore, the required plastic deformation capacity of a beam member is zero (plastic modulus 1.0), which is sufficient.
  • the targeted rolled H-section steel 1 in the present embodiment is a rolled H-section steel to be used within the elastic range. It is considered that the required plastic deformation capacity is set to zero (plastic modulus 1.0), whereby the flange breadth-thickness ratio B/(2 ⁇ t 2 ) makes the numerical range shown in JIS G 3192 or JP-A-2002-88974, i.e., the upper limit 10.0 of the flange breadth-thickness ratio B/(2 ⁇ t 2 ) into a minimum value. However, in addition to this value, the flange breadth-thickness ratio B/(2 ⁇ t 2 ) is 9.4 in a graph shown by plotting various rolled H-section steels of ASTM shown in FIG.
  • the flange breadth-thickness ratio B/(2 ⁇ t 2 ) is made greater than 11.1.
  • the web breadth-thickness ratio (H ⁇ 2 ⁇ t 2 )/(t 1 ) is a numerical range shown in JIS G 3192 or Japanese Unexamined Patent Application, First Publication No. JP-A-2002-88974. That is, the upper limit of the web breadth-thickness ratio (H ⁇ 2 ⁇ t 2 )/(t 1 ) is 56.6 in a graph shown by plotting various rolled H-section steels of JIS standard shown in FIGS. 1 and 4 , is 63.5 in the various rolled H-section steels of ASTM shown in FIG. 6 , and is 63.3 in various rolled H-section steels of BS standard which is shown in FIG. 8 .
  • the upper limit 63.5 of the various rolled H-section steels of ASTM standard shown in FIG. 6 is the greatest, in the present embodiment, the upper limit of the web breadth-thickness ratio is made greater than the upper limit 63.5 of the various rolled H-section steels of ASTM standard.
  • the web breadth-thickness ratio (H ⁇ 2 ⁇ t 2 )/(t 1 ) is set to 71.0 or less because the flange breadth-thickness ratio B/(2 ⁇ t 2 ) becomes 15.5 or less when the tensile strength is 400 to 510 N/mm 2 and the design yield stress F of a steel material is 235 N/mm 2 .
  • the above tensile strength and the design yield strength are the limiting values (similarly specified also in AU design criteria) determined in the Building Standard Law (Notification No. 596 by Ministry of Land, Infrastructure and Transport on May 18, 2007).
  • the web breadth-thickness ratio (H ⁇ 2 ⁇ t 2 )/(t 1 ) of the rolled H-section steel is not specified in the AISC design criteria and BS design criteria, but is specified as 124.0 in the EN design criteria. From this, in the present embodiment, 71.0 of the web breadth-thickness ratio (H ⁇ 2 ⁇ t 2 )/(t 1 ) specified in AIJ design criteria is adopted. This value is generalized as 1100/ ⁇ square root over ( ) ⁇ (F), using the design yield stress F.
  • k is the buckling coefficient
  • E is the Young's modulus
  • ⁇ is the Poisson's ratio
  • t is the plate thickness
  • b is the plate breadth.
  • the rolled H-section steel has a cross-sectional shape in which lateral buckling and bending torsion buckling tend to occur.
  • the flanges are the most important parts in order to secure the proof stress of a beam. From this, the flange breadth-thickness ratio is set a little more severely than the elastic local buckling. In the case of the three-edges simply supported and one edge of freedom (in the case of the flanges), the flange breadth-thickness ratio is 14.0 in an allowable stress design.
  • the web is formed as follows so that the web breadth-thickness ratio becomes a little gentler than the elastic local buckling.
  • the web breadth-thickness ratio is 71.0 in an allowable stress design.
  • the flange breadth-thickness ratio B/(2 ⁇ t 2 ) and the web breadth-thickness ratio (H ⁇ 2 ⁇ t 2 )/(t 1 ) greater than before, the height H of a cross-section and the dimension B of the side in the rolled H-section steel 1 can be increased. Therefore, even when the web thickness t 1 is equal to or slightly smaller than the flange thickness t 2 , the cross-sectional secondary moment (I) per unit cross-sectional area and a section modulus (Z) for resisting a bending stress can be made higher than a conventional case, to improve rigidity (especially, around a strong axis).
  • the web thickness and flange thickness ratio (t 1 /t 2 ) can be made greater than a numerical range shown in JIS G 3192, i.e., the upper limit 0.75 of the web thickness to flange thickness ratio (t 1 /t 2 ).
  • the lower limit of the web thickness to flange thickness ratio (t 1 /t 2 ) is made greater than 0.75.
  • the web thickness and flange thickness ratio (t 1 /t 2 ) is set to less than 1.0.
  • various rolled H-section steels 1 of the present embodiment set to various dimensions are shown in Table 3 as Examples A to H of the invention.
  • a cross-sectional dimension, the side-height ratio (B/H), the flange breadth-thickness ratio B/(2 ⁇ t 2 ), the web breadth-thickness ratio (H ⁇ 2 ⁇ t 2 )/(t 1 ), the web thickness to flange thickness ratio (t 1 /t 2 ), and the cross-sectional performance are shown in Table 3.
  • various conventional rolled H-section steels 2 in Japan corresponding to the examples A to H of the invention are shown together in Table 3 as conventional examples A to H.
  • the cross-sectional secondary moment ratios become larger as the travel distances (absolute number) of the examples A and B become larger than those of the examples C to H (travel distance ⁇ 25 on the same coordinate axes), i.e., the breadth and height of a H-shaped cross-section increase.
  • the examples A to H of the invention are rolled H-section steels for a small beam.
  • the side-height ratio becomes 0.51 or less
  • the flange breadth-thickness ratio becomes 11.8 to 13.8
  • the web breadth-thickness ratio becomes 64.6 to 69.8
  • the web thickness and flange thickness ratio becomes 0.77 to 0.95 or less.
  • the examples A to H of the invention that are rolled H-section steels of the present embodiment in Table 3 and the conventional examples A to H that are conventional rolled H-section steels corresponding thereto are compared with each other, compared to the conventional examples, in the examples A to H of the invention that are rolled H-section steels of the present embodiment in which the web thickness t 1 and flange thickness t 2 are made small, and the height H and the dimension B of the side that is the flange breadth, it is understood that the cross-sectional area A can be reduced by 10% to 16%, the cross-sectional secondary moment (I) ratio around a strong axis can exhibit a performance improvement of 14% to 61%, and the section modulus (Z) ratio around a strong axis can exhibit a performance improvement of 17%. In addition, in Tables 2-1 to 2-3, it is understood that the minimum of the side-height ratio (B/H) is 0.33.
  • the rolled H-section steels 1 including the examples A to H of the invention that satisfy respective conditions of the above Expressions (1), (3), and (4) of the present embodiment are rolled H-section steels in a region that can be clearly distinguished from a region of conventional well-known rolled H-section steels in Japan and other countries (refer to FIGS. 1 , 6 , 8 , and 10 ).
  • the rolled H-section steels 1 including the examples A to H of the invention that satisfy conditions of the above Expressions (1), (3), and (4) of the present embodiment are rolled H-section steels in a region that can be clearly distinguished from a region of conventional well-known rolled H-section steels in Japan and other countries (refer to FIGS. 2 , 7 , 9 , and 11 ).
  • the rolled H-section steel 1 whose dimensions are set as in the present embodiment exhibits a markedly excellent cross-sectional performance compared to the conventional well-known rolled H-section steel.
  • FIG. 1 and Table 3 show the cross-sectional performance of the examples of the present embodiment and the conventional examples when the specified design strength F of a steel material is 235 N/mm 2 .
  • the cross-sectional performance of the examples of the present embodiment in a case where the specified design strength F of the steel material (N/mm 2 ) is 235 ⁇ F ⁇ 275 and the concrete specific specified design strength F is 275 N/mm 2 will be described, in comparison to the conventional examples.
  • the upper limits of the flange breadth-thickness ratio B/(2 ⁇ t 2 ) and web breadth-thickness ratio (H ⁇ 2 ⁇ t 2 )/(t 1 ) of the rolled H-section steel 1 in the present embodiment may satisfy the limiting values determined in the Building Standard Law (Notification No. 596 by Ministry of Land, Infrastructure and Transport on May 18, 2007), and satisfy AISC design criteria, BS design criteria, and EN design criteria.
  • the flange breadth-thickness ratio B/(2 ⁇ t 2 ) is less than or equal to 215 ⁇ square root over ( ) ⁇ (F) (i.e., less than or equal to 14.0)
  • the web breadth-thickness ratio (H ⁇ 2 ⁇ t 2 )/(t 1 ) is less than or equal to 1100/ ⁇ square root over ( ) ⁇ (F) (i.e., less than or equal to 71.0).
  • the flange breadth-thickness ratio B/(2 ⁇ t 2 ) may be less than or equal to 215/ ⁇ square root over ( ) ⁇ (F)
  • the web breadth-thickness ratio (H ⁇ 2 ⁇ t 2 )/(t 1 ) may be less than or equal to 1100/ ⁇ square root over ( ) ⁇ (F).
  • the flange breadth-thickness ratio B/(2 ⁇ t 2 ) may be less than or equal to 215/ ⁇ square root over ( ) ⁇ 275 (i.e., less than or equal to 12.9), and the web breadth-thickness ratio (H ⁇ 2 ⁇ t 2 )/(t 1 ) may less than or equal to 1100/ ⁇ square root over ( ) ⁇ (275) (i.e., less than or equal to 66.0).
  • the rolled H-section steel and the dimensions of the parts in the present embodiment in which it is required that the design yield stress F (N/mm 2 ) of the steel material as described above satisfies 235 ⁇ F ⁇ 275 N, are set as follows.
  • a rolled H-section steel may be adopted in which the relationship between the height (H) and the length (B) of the side that is the flange breadth in the rolled H-section steel is
  • a rolled H-section steel may be adopted that satisfies the above conditions, and in which the relationship between the height H and the web thickness t 1 , and the flange thickness t 2 is defined as
  • a rolled H-section steel may be adopted that satisfies the above conditions and in which the relationship between the web thickness t 1 and the flange thickness t 2 is
  • various rolled H-section steels 1 of the present embodiment set to various dimensions are shown in Table 4 as Examples A to H of the invention.
  • a cross-sectional dimension, the side-height ratio (B/H), the flange breadth-thickness ratio B/(2 ⁇ t 2 ), the web breadth-thickness ratio (H ⁇ 2 ⁇ t 2 )/(t 1 ), the web thickness and flange thickness ratio (t 1 /t 2 ), and the cross-sectional performance are shown in Table 4.
  • various conventional rolled H-section steel 2 corresponding to the examples A to H of the invention are together shown as conventional examples A to H.
  • the examples A to H of the invention are rolled H-section steel for a small beam.
  • the side-height ratio becomes 0.51 or less
  • the flange breadth-thickness ratio becomes 11.3 to 12.5
  • the web breadth-thickness ratio becomes 58.5 to 61.0
  • the web thickness and flange thickness ratio becomes 0.79 to 0.90.
  • the examples A to H of the invention that are rolled H-section steel of the present embodiment in Table 4 and the conventional examples A to H that are conventional rolled H-section steel corresponding thereto are compared with each other, compared to the conventional examples, in the examples A to H of the invention that are rolled H-section steel of the present embodiment in which the web thickness t 1 and flange thickness t 2 are made small, and the height H and the dimension B of the side that is the flange breadth, it is understood that the cross-sectional area A can be reduced by 5% to 10%, the cross-sectional secondary moment (I) ratio around a strong axis can exhibit a performance improvement of 5% to 65%, and the section modulus (Z) ratio around a strong axis can exhibit a performance improvement which at least the same as before, and the best achieves improvement of 20%.
  • the cross-sectional area A can be reduced by 5% to 10%
  • the cross-sectional secondary moment (I) ratio around a strong axis can exhibit a performance improvement of 5%
  • the rolled H-section steel 1 of the present embodiment can also be applied to a small-breadth beam, a middle-breadth small beam, and a middle-breadth beam in addition to the small-breadth small beam.
  • rolled H-section steel that is standardized in major advanced nations including the U.S., Britain, Europe, and Japan, it is possible to provide a rolled H-section steel that is made to be lightweight for a small beam and does not degrade the cross-sectional performance.

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US13/261,127 2009-07-09 2010-07-09 Rolled h-section steel Abandoned US20120186191A1 (en)

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US11571736B2 (en) * 2018-09-04 2023-02-07 Tox Pressotechnik Gmbh & Co. Kg C-shaped frame and device for cold joining

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JP6003526B2 (ja) * 2012-10-23 2016-10-05 Ｊｆｅスチール株式会社 圧延ｈ形鋼
JP6003527B2 (ja) * 2012-10-23 2016-10-05 Ｊｆｅスチール株式会社 圧延ｈ形鋼
JP6003591B2 (ja) * 2012-12-03 2016-10-05 新日鐵住金株式会社 圧延ｈ形鋼
JP6119588B2 (ja) * 2013-12-11 2017-04-26 Ｊｆｅスチール株式会社 Ｈ形鋼部材
JP6664193B2 (ja) 2014-12-12 2020-03-13 三星電子株式会社Ｓａｍｓｕｎｇ Ｅｌｅｃｔｒｏｎｉｃｓ Ｃｏ．，Ｌｔｄ． バックライトユニット

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US7107730B2 (en) * 2001-03-07 2006-09-19 Jae-Man Park PSSC complex girder
US20050247007A1 (en) * 2002-06-05 2005-11-10 Chika Iri Steel frame building and joint structure of column and beam
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SG177550A1 (en) 2012-02-28
JP4677059B2 (ja) 2011-04-27
CN102482881A (zh) 2012-05-30
CN102482881B (zh) 2014-09-17
JPWO2011004895A1 (ja) 2012-12-20
WO2011004895A1 (ja) 2011-01-13
HK1171058A1 (en) 2013-03-15
KR101348866B1 (ko) 2014-01-07

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