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

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Presentation on theme: "Steel Construction Manual American Institute of Steel Construction Thirteenth Edition Part 1 Dimensions and Properties."— Presentation transcript:

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

2 Wide-flange (W) Shapes Most 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

3 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

4 Flange Web Major axisDesignation Weak axis

5 Cross-sectional area Actual depth

6 WebThickness Flange Properties

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

8 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 stability parameters

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11 M-Shapes Not classified in ASTM 6 as W-, S- or HP- shapes Same properties (A, d, t w, b f, etc) as W- shapes Can have sloped inside flange or other features

12 American Standard (S) Shapes 16-2/3% 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

13 Narrow flange Note: slope on inside of flange

14 Same properties as for W shapes

15 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

16 Actual depth Property for design Property for detailing

17 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 legsAngles 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).

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

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

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 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

21 Stem, not web

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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 HSS 10 x 4 x 3/8 Wall thickness Section Designation Outside longer dimension Outside shorter dimension

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

25 Weak axis structural properties

26 Equal outside dimensions Structural properties for strong and weak axes

27 Diameter over design thickness Nominal versus design thickness

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

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

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

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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

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

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

35 Nominal wall thickness

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38 Limited availability Steel Types Preferred Specification

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


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