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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

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

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) 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


Web

Weak axis

Designation

Major axis

Flange


Actual depth

Cross-sectional area


Flange Properties

WebThickness


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

parameters


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

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


Narrow flange

Note: slope on inside of flange


Same properties as for W shapes


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


Actual depth

Property for design

Property for

detailing


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).


Location of elastic centroid

Location of plastic centroid

X axis properties

Designation


Minor (weak) axis for a single angle

Y axis properties


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


Stem, not web


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

Dimension

Strong axis structural properties

Actual Wall Thickness

Design Wall Thickness = 0.93 x Actual Wall Thickness

Outside Shorter

Dimension


Weak axis structural properties


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

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


Long legs back-to-back

Short legs back-to-back

Radius of gyration for compression members

Separation due to gusset plates


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


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


Suitable for Crane Girders

Channel

Moment of Inertia, Ixx

Weight

W shape


Nominal wall thickness


PreferredSpecification

Limited availability

Steel Types


Plates > 8 inch width

Bars < 8 inch width

Thickness in inches


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