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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

Steel Construction Manual

American Institute of Steel Construction

Thirteenth Edition

Part 1

Dimensions and Properties

Wide flange w shapes

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

Wide flange w shapes1

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


Steel construction manual


Weak axis


Major axis


Steel construction manual

Actual depth

Cross-sectional area

Steel construction manual

Flange Properties


Steel construction manual

End of fillet transition between web and flange

Flat portion of web

Spacing between rows

of bolts in flange

Steel construction manual

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


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

American standard s shapes

American Standard (S) Shapes

16-2/3% slope on inner flange surface

Relatively narrow flanges and thicker webs when

compared to W shapes



Weight per foot

Nominal depth

Use is less common because of lower moment of inertia,

tapered flanges and low lateral stiffness

Steel construction manual

Narrow flange

Note: slope on inside of flange

Steel construction manual

Same properties as for W shapes




Weight in pounds per foot

Nominal depth is same as actual depth


Actual depth

MC – Miscellaneous channel – Other than 2 on 12 slope on

inner flange

Steel construction manual

Actual depth

Property for design

Property for


Steel construction manual


For a single angle major axes do not correspond to x and y axes

Section designation

Short leg length


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).

Steel construction manual

Location of elastic centroid

Location of plastic centroid

X axis properties


Steel construction manual

Minor (weak) axis for a single angle

Y axis properties

Steel construction manual


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

Steel construction manual

Stem, not web

Hollow structural shapes

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

Steel construction manual

Outside Longer


Strong axis structural properties

Actual Wall Thickness

Design Wall Thickness = 0.93 x Actual Wall Thickness

Outside Shorter


Steel construction manual

Weak axis structural properties

Steel construction manual

Structural properties for

strongand weak axes

Equal outside dimensions

Steel construction manual

Nominal versus design thickness

Diameter over design thickness

Steel construction manual

Nominal wall thickness

Standard, x-strong and xx-strong designations

Double angles

Double Angles


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

Steel construction manual

Long legs back-to-back

Short legs back-to-back

Radius of gyration for compression members

Separation due to gusset plates

Double channels

Double Channels

Designated as 2C or 2MC


Y axis properties depend on back-to-back separation

X axis properties can be obtained from x axis

properties of single channel

Steel construction manual

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

Steel construction manual

Suitable for Crane Girders


Moment of Inertia, Ixx


W shape

Steel construction manual

Nominal wall thickness

Steel construction manual


Limited availability

Steel Types

Steel construction manual

Plates > 8 inch width

Bars < 8 inch width

Thickness in inches

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