LRFD Column Load Tables - cousesteel.com

1 LRFDC olumnLoad TablesHSS2 Electric Resistance Welding (ERW) ProcessIn the tube mill, flat steel strip (1) is formed continuously around itslongitudinal axis to produce a round tube. This is done by moving thestrip through a progressive set of rolls (2-6). The strip edges (7) areheated by either high frequency induction or contact welding and thenforged together by weld rolls to create a continuous longitudinal weldwithout the addition of filler metal. The weld seam (8) is then cooledand processed through a set of sizing/shaping rolls which cold-form itinto a round (9), square (10) or rectangular (11) Weld-Square (ERW) ProcessIn the weld mill, driven forming dies progressively shape the flat strip(1) by forming the top two corners (2) of the square or rectangular tubein the initial forming station.

2 Subsequent stations form the bottom twocorners (3) of the shape. No cold working of the sides of the shape isperformed, and the shape s seam is welded by high-frequency contactswhen the tube is near its final shape and size. The welded tube (4) iscooled and then driven through a series of sizing stations which qualifiesthe tube s final Manufacturing MethodsThe transformation of steel strip into hollow structural sections (HSS) is the result of a series of operations including forming,welding and sizing. Currently three methods are being used in North America for the manufacture of HSS.

3 These methods aredescribed below. Each method meets ASTM A-500 and CSA requirements for the the manufacture of HSS, and the sizeslisted in this brochure may be produced to either Arc Weld (SAW) ProcessTwo identical pieces of flat strip (1) are placed in a press brake andformed into two identical halves (2) of a finished tube size. A backup baris tack welded to each leg of one of the half-sections (3). The two half-sections are fitted together toe-to-toe (4) and welded by the submergedarc process to complete the square or rectangular section (5).

4 1234567891011112233412345213OF NORTH AMERICASTI/HSS Member CompaniesAtlas Tube, Clark Street, Box 970 Harrow, Ontario N0R 1G0 Telephone: (519) 738-3541(800) 265-6912 Fax: (519) 738-3537 Bull Moose Tube Company1819 Clarkson Road, Suite 100 Chesterfield, MO 63017 Telephone: (636) 537-2600(800) 325-4467 Fax: (636) 537-5848 Eugene Welding Box 249 Marysville, MI 48040 Telephone: (810) 364-7421(800) 336-3926 Fax: (810) 364-4347 Hanna Steel Box 558, Fairfield, AL 35064 Telephone: (205) 780-1111(800) 633-8252 Fax: (205) 783-8296 Hannibal Industries, Box 58814, 3851 Santa Fe Angeles, CA 90058 Telephone: (323) 588-4261 Fax: (323) 589-5640 Independence Tube Corporation6226 W.

5 74th StreetChicago, IL 60638-6196 Telephone: (708) 496-0380(800) 376-6000 Fax: (708) 563-1950 IPSCO Tubulars Box 18, 2011 7th AvenueCamanche, IA 52730 Telephone: (563) 242-0000(800) 950-4772 Fax: (563) 242-9137 LTV Copperweld1855 East 122nd Street Chicago, IL 60633 Telephone: (800) 733-5683 Fax: (773) 646-6128(In Canada)14 Holtby AvenueBrampton, OntarioCanada L6X 2M3 Telephone: (905) 451-2400(800) 268-3005 Fax: (905) 840-4716 Maverick Tube Corporation16401 Swingley Ridge Road,Suite 700 Chesterfield, MO 63017 Telephone: (314) 733-1600(800) 840-8823 Fax: (314) 733-1677 Novamerican Steel Hymus BoulevardDorval, Quebec, Canada H9P 1J8 Telephone: (514) 335-6682(800) 361-1496 Fax: (514) 683-5285(In United States)600 Dean Sievres PlaceMorrisville, PA 19067 Telephone: (215) 295-8813 Fax: (215) 295-8798 Productos Laminados de Monterrey, SA de CVHeadquarters & Monterrey PlantAve.

6 Lazaro Cardenas 1525 Nino ArtilleroMonterrey, Mexico 64280 Telephone: (8) 351-1625(8) 351-1070 Fax: (8) 351-0322( Office)Prolamsa, SW Freeway, Suite 521 Stafford, TX 77477 Telephone: (281) 494-0900 Fax: (281) 494-0990 Valmont Industries (Structural Tube Division) Box 2620 Tulsa, OK 74101 Telephone: (918) 583-5881(800) 331-3002 Fax: (918) 585-1927 Vest, Incorporated6023 Alcoa AvenueLos Angeles, CA 90058 Telephone: (323) 581-8823(800) 421-6370 Fax: (323) 581-3465 Welded Tube of Canada Limited111 Rayette RoadConcord, Ontario,Canada L4K 2E9 Telephone: (905) 669-1111(800) 565-8823 Fax: (905) 738-40704 load and Resistance Factor Design ( lrfd ) Column load Tables are presented for square, rectangular and round hollow structuralsections (HSS) manufactured by the electric resistance welding (ERW) method and for square, and rectangular HSS manufactured bythe submerged arc welding (SAW) method.

7 Tables of design stresses for compression members for six minimum specified yield stresssteels from Fy= 42 ksi to Fy= 70 ksi are also tabulated design strength loads and the compression member design stresses have been calculated in accordance with the newAISC Specification for the Design of Steel Hollow Structural Sections - April 15, 1997. This specification is a supplement to theAISC load and Resistance Factor Design Specification for Structural Steel Buildings-December, 1993. The design strength loads arebased upon section property data for HSS that were recalculated in 1996 to account for today s more precise manufacturing section property data for HSS is published in Hollow Structural Sections - Dimensions and Section Properties available fromthe Steel Tube Institute of North America.

8 Tables for square and rectangular HSS are presented for Fy= 46 ksi and for Fy= 50 ksi. Separate Tables are used for HSS sizesproduced by the ERW and SAW manufacturing for round HSS are presented for Fy= 42 ksi, Fy= 46 ksi and for Fy= 50 ksi. The round HSS are produced by the ERWmanufacturing design strength loads have been calculated for effective lengths, KL, with respect to the least radius of gyration, r or ry, varyingfrom 0 to 40 feet. A HSS defined as a slender element cross section , in accordance with Section of the AISC Specification , isidentified in the Tables with an asterisk (*) immediately following the design wall thickness parameter in the tabulated values of compression member design stresses, on pages 124 through 126, are calculated in accordance with therequirements of AISC Specification Section Note that these design stresses do not apply to a HSS defined as a slender elementcross section.

9 Refer to part 3, Column Design, of the AISC 2nd Edition manual of Steel Construction - load & Resistance Factor Design for adiscussion of the design strength of columns . The symbols in these Tables follow those used in the AISC manual .PageHow to Use the Column load Tables .. 5 Column load Tables :Square HSS (ERW) Fy = 46 ksi .. 6 Rectangular HSS (ERW)Fy = 46 ksi ..14 Square HSS (ERW) Fy = 50 ksi .. 36 Rectangular HSS (ERW) Fy = 50 ksi ..44 Square HSS (SAW) Fy = 46 ksi ..67 Rectangular HSS (SAW) Fy = 46 ksi ..69 Square HSS (SAW) Fy = 50 ksi.

10 72 Rectangular HSS (SAW) Fy = 50 ksi ..74 PageRound HSS (ERW) Fy = 42 ksi .. 78 Round HSS (ERW) Fy = 46 ksi ..93 Round HSS (ERW) Fy = 50 ksi .. 108 Design Stress TablesFy = 42 ksi .. 124Fy = 46 ksi .. 124Fy = 50 ksi .. 125Fy = 60 ksi .. 125Fy = 65 ksi .. 126Fy = 70 ksi .. 126 ForewordTable of ContentsThe information presented in this publication has been prepared in accordance with recognized engineering principles and is for general information it isbelieved to be accurate, this information should not be used or relied upon for any specific application without competent professional examination and verification of itsaccuracy, suitability, and applicability by a licensed professional engineer, designer.