steel construction manual
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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. - PowerPoint PPT PresentationTRANSCRIPT
Steel Construction Manual
American Institute of Steel Construction
Thirteenth EditionPart 1
Dimensions and Properties
Wide-flange (W) ShapesMost 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
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
Flange
Web
Major axis
Designation
Weak axis
Cross-sectional area
Actual depth
WebThickness
Flange Properties
Spacing between rowsof bolts in flange
Flat portion of web
End of fillet transition between
web and flange
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 stabilityparameters
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) Shapes16-2/3% 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
Narrow flange
Note: slope on inside of flange
Same properties as for W shapes
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
Actual depth
Property for design
Property fordetailing
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 legs
Angles
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).
Designation
Location of elastic centroid
Location of plastic centroid X axis properties
Y axis properties
Minor (weak) axis for a single angle
TeesWT -, 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
Stem, not web
Hollow Structural ShapesRectangular, 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
Outside LongerDimension
Outside ShorterDimension
Actual Wall Thickness
Design Wall Thickness = 0.93 x Actual Wall Thickness
Strong axis structural properties
Weak axis structural properties
Equal outside dimensionsStructural properties for strong and weak axes
Diameter over design thickness
Nominal versus design thickness
Standard, x-strong and xx-strong designations
Nominal wall thickness
Double Angles
2L6x4x3/4
Major axes are now x and y
X axis properties may be obtained from x axisproperties of single angle
Y axis properties depend on separation between backs angles and whether LLBB or SLBB
Long legs back-to-backShort legs back-to-back
Separation due to gusset plates
Radius of gyration for compression members
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 axisproperties of single channel
Y axis properties depend on back-to-back distance (gusset plate thicknesses) between individual channels
Channel
W shape Weight
Moment of Inertia, Ixx
Suitable for Crane Girders
Nominal wall thickness
Limited availability
Steel Types
Preferred Specification
Plates > 8 inch widthBars < 8 inch width
Thickness in inches