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

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

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Wide-flange (W) Shapes 5 W 14 x 730 Actual depth is 22.4 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 W 14 x 90 Actual depth is 14 inches

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Flange Web Major axisDesignation Weak axis

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Cross-sectional area Actual depth

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WebThickness Flange Properties

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

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

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M-Shapes Not classified in ASTM 6 as W-, S- or HP- shapes Same properties (A, d, t w, b f, etc) as W- shapes Can have sloped inside flange or other features

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

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Narrow flange Note: slope on inside of flange

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Same properties as for W shapes

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

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Actual depth Property for design Property for detailing

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L6x4x3/4 Short leg length For a single angle major axes do not correspond to x and y axes Long leg length Thickness of both legsAngles Section designation 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).

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

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

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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 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 Nominal depths and weights of a WT is exactly half of the parent shape

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Stem, not web

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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 HSS 10 x 4 x 3/8 Wall thickness Section Designation Outside longer dimension Outside shorter dimension

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

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Weak axis structural properties

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Equal outside dimensions Structural properties for strong and weak axes

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Diameter over design thickness Nominal versus design thickness

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

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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

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

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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

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

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Channel W shape Weight Moment of Inertia, I xx Suitable for Crane Girders

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Nominal wall thickness

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Limited availability Steel Types Preferred Specification

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

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