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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



Weak axis


Major axis


Actual depth

Cross-sectional area

Flange Properties


End of fillet transition between web and flange

Flat portion of web

Spacing between rows

of bolts in flange

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

Narrow flange

Note: slope on inside of flange



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

Actual depth

Property for design

Property for



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).

Location of elastic centroid

Location of plastic centroid

X axis properties



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

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

Outside Longer


Strong axis structural properties

Actual Wall Thickness

Design Wall Thickness = 0.93 x Actual Wall Thickness

Outside Shorter


Structural properties for

strongand weak axes

Equal outside dimensions

Nominal versus design thickness

Diameter over design thickness

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

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

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

Suitable for Crane Girders plate thicknesses) between individual channels


Moment of Inertia, Ixx


W shape

Nominal wall thickness plate thicknesses) between individual channels

Preferred plate thicknesses) between individual channelsSpecification

Limited availability

Steel Types

Plates plate thicknesses) between individual channels> 8 inch width

Bars < 8 inch width

Thickness in inches