Presentation is loading. Please wait.

Presentation is loading. Please wait.

Steel Construction Manual

Similar presentations

Presentation on theme: "Steel Construction Manual"— Presentation transcript:

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

2 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

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

4 Major axis Flange Web Weak axis Designation

5 Actual depth Cross-sectional area

6 Flange Properties WebThickness

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

8 Flange and web stability
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



11 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 11

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

13 Narrow flange Note: slope on inside of flange

14 Same properties as for W shapes

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

16 Property for design Property for detailing Actual depth

17 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).

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

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

20 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 20

21 Stem, not web

22 22

23 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 Section Designation Outside shorter dimension 23

24 Strong axis structural properties
Outside Longer Dimension Strong axis structural properties Actual Wall Thickness Outside Shorter Dimension Design Wall Thickness = 0.93 x Actual Wall Thickness 24

25 Weak axis structural properties

26 Structural properties for
strong and weak axes Equal outside dimensions

27 Nominal versus design thickness
Diameter over design thickness

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

29 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 29

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

31 31

32 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 32

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

34 Suitable for Crane Girders
Channel Moment of Inertia, Ixx W shape Weight

35 Nominal wall thickness



38 Preferred Specification
Limited availability Steel Types

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

Download ppt "Steel Construction Manual"

Similar presentations

Ads by Google