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AECT250-Lecture 2

AECT250-Lecture 2 - Lecture 2 Steel properties and ASD LRFD...

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Lecture 2 - Page 1 of 8 Lecture 2 – Steel properties and ASD & LRFD principles General Steel Properties : Structural steel used in buildings uses carbon steel. It is a mixture of mostly iron (98%+ ) and carbon (0.15% - 0.59%), as well as a percentage of other alloys used to enhance certain properties. Some of the alloys used include silicon, manganese, nickel, sulfur and phosphorus. Different steels exhibit stress-strain relationships as shown below: As designers of structural steel, we are most interested in the following 3 properties: a) Modulus of elasticity = 29,000 KSI b) Yield stress = F y c) Ultimate stress = F u
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Typical structural shapes : (ref. AISC p. 1-3 thru 1-8) 1) I shapes are categorized into 4 groups – “W”, “M”, “S”, and “HP” 2) Channels – “C” and “MC” 3) Angles – “L” 4) Structural Tees – cut from I shapes, “WT”, “MT” and “ST” 5) Hollow Structural Section – “HSS” rectangular and round 6) Steel pipe Refer to AISC p. 1-10 thru 1-115 for dimensions and structural properties of the above-noted structural shapes and combination of shapes. Refer to AISC Table 2-3 (page 2-39) for a list of appropriate structural steel ASTM designations for various structural shapes. In general, the following ASTM designations are commonly used: ASTM Designation F y (KSI) F u (KSI) Applicable structural shapes A36 36 58 M, S, C, MC, L, plates A572 50 65 HP A992 50 65 W A53 35 60 Pipe A500, Gr. B 42 58 HSS round A500, Gr. B 46 58 HSS rectangular A588 50 70 Corrosion-resistant for all rolled shapes Advantages of Steel-Framed Structures : 1) High-strength 2) Excellent quality control, predictability 3) Ductility 4) Speed of erection 5) Lightweight 6) Can be easily modified Disadvantages of Steel-Framed Structures : 1) Fireproofing 2) Corrosion 3) Need for bracing 4) Semi-skilled labor (ironworkers, welders)
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AECT250-Lecture 2 - Lecture 2 Steel properties and ASD LRFD...

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