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Steel Construction Manual

Steel Construction Manual. American Institute of Steel Construction Thirteenth Edition Part 1 Dimensions and Properties. Wide-flange (W) Shapes. Most widely used section. Two flanges held apart by a web. Essentially parallel inner and outer flange surfaces. Section designation.

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Steel Construction Manual

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  1. Steel Construction Manual American Institute of Steel Construction Thirteenth Edition Part 1 Dimensions and Properties

  2. Wide-flange (W) Shapes Most widely used section Two flanges held apart by a web Essentially parallel inner and outer flange surfaces Section designation Weight in pounds/per foot W 24 x 55 Nominal depth in full inches Nominal depths from 4-inch to 44 inch Weights available from 9 lb/ft to 800 lb/ft

  3. Wide-flange (W) Shapes W 14 x 730 W 14 x 90 Actual depth is 22.4 inches Actual depth is 14 inches All shapes from W14 x 90 to W 14 x 730 have flat (T) part of web of 10 inches. All these shapes can be stacked on each other 5

  4. Web Weak axis Designation Major axis Flange

  5. Actual depth Cross-sectional area

  6. Flange Properties WebThickness

  7. End of fillet transition between web and flange Flat portion of web Spacing between rows of bolts in flange

  8. Moment of Inertia (I), elastic section modulus (S), radius of gyration (r), plastic section modulus (Z) for strong and weak axes Weight per foot Flange and web stability parameters

  9. M-Shapes Not classified in ASTM 6 as W-, S- or HP- shapes Same properties (A, d, tw, bf, etc) as W- shapes Can have sloped inside flange or other features

  10. American Standard (S) Shapes 16-2/3% slope on inner flange surface Relatively narrow flanges and thicker webs when compared to W shapes Sectiondesignation S24x121 Weight per foot Nominal depth Use is less common because of lower moment of inertia, tapered flanges and low lateral stiffness

  11. Narrow flange Note: slope on inside of flange

  12. Same properties as for W shapes

  13. Channels Sectiondesignation Weight in pounds per foot Nominal depth is same as actual depth C15x50 Actual depth MC – Miscellaneous channel – Other than 2 on 12 slope on inner flange

  14. Actual depth Property for design Property for detailing

  15. Angles For a single angle major axes do not correspond to x and y axes Section designation Short leg length L6x4x3/4 Thickness of both legs Long leg length Equal leg and unequal leg angles available Angles are best used in pairs as LLBB (Long-leg- back-to-back) or SLBB (Short-leg-back-to-back).

  16. Location of elastic centroid Location of plastic centroid X axis properties Designation

  17. Minor (weak) axis for a single angle Y axis properties

  18. Tees WT -, MT- and ST- are obtained by shearing or thermal-cut from parent shape of W, M and S respectively Two WT 22 x 131 can be made by cutting a W 44 x 262 Nominal depths and weights of a WT is exactly half of the parent shape Off-center cuts can be done but properties not listed in Manual Used for top and bottom chords of trusses and diagonal bracing in buildings

  19. Stem, not web

  20. Hollow Structural Shapes Rectangular, Square or Round HSS Welded or Seamless Welded HSS made by welding sheet steel Seamless made by extrusion of solid round bars Outside longer dimension HSS 10 x 4 x 3/8 Wall thickness Outside shorter dimension Section Designation

  21. Outside Longer Dimension Strong axis structural properties Actual Wall Thickness Design Wall Thickness = 0.93 x Actual Wall Thickness Outside Shorter Dimension

  22. Weak axis structural properties

  23. Structural properties for strongand weak axes Equal outside dimensions

  24. Nominal versus design thickness Diameter over design thickness

  25. Nominal wall thickness Standard, x-strong and xx-strong designations

  26. Double Angles 2L6x4x3/4 Major axes are now x and y X axis properties may be obtained from x axis properties of single angle Y axis properties depend on separation between backs angles and whether LLBB or SLBB

  27. Long legs back-to-back Short legs back-to-back Radius of gyration for compression members Separation due to gusset plates

  28. Double Channels Designated as 2C or 2MC 2C15x50 Y axis properties depend on back-to-back separation X axis properties can be obtained from x axis properties of single channel

  29. Y axis properties depend on back-to-back distance (gusset plate thicknesses) between individual channels

  30. Suitable for Crane Girders Channel Moment of Inertia, Ixx Weight W shape

  31. Nominal wall thickness

  32. PreferredSpecification Limited availability Steel Types

  33. Plates > 8 inch width Bars < 8 inch width Thickness in inches

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