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Design of Steel Structural 803459-3. Mohammed Alsabban [email protected] Office : 1153 Ext. 1142...
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Transcript of Design of Steel Structural 803459-3. Mohammed Alsabban [email protected] Office : 1153 Ext. 1142...
Design of Steel Structural
803459-3
Mohammed Alsabban
• [email protected]• Office : 1153• Ext. 1142• Mobile 0-5555-10-233• Office Hours:
– Sun 8am:10am– Tue 11am:12 noon– Wed 5pm:6pm
Text
• Book: Structural Steel Design• Authors:
– Jack C. McCormac and – Stephen F. Csernak
• Publisher: Pearson• Edition: Fifth (International)• Year: 2012
Manual
• 14th edition of the Steel Construction Manual (AISCM)
• Based on the 2010 Specification for Structural Steel Buildings (ANSI / AISC 360-10), (AISCS)
Topics Covered During ClassS/N Topic title Lecture
HoursWeeks
(Equivalent)
1 Introduction to Structural Steel Design 2 0.672 Specifications, Loads, and Methods of Design 1 0.333 Analysis of Tension Members 3 14 Design of Tension Members 3 15 Intro to Axially Loaded Compression Members 3 1 First Term Exam 1 0.336 Design of Axially Loaded Compression Members 2 0.677 Design of Axially Loaded Compression Members (Continued) and Column
Base Plates3 1
8 Introduction to Beams 2 0.67 Second Term Exam 1 0.339 Design of Beams for Moments 3 1
10 Design of Beams-Miscellaneous Topics (Shear, Deflection, etc) 3 111 Bending and Axial Force 3 1 Third Term Exam 1 0.33
12 Bolted Connections 2 0.66 Forth Term Exam 1 0.33
13 Eccentrically Loaded Bolted Connections and Historical Notes on Rivets2 0.67
14 Welded Connections 3 1 Fifth Term Exam 1 0.33 Review 3 1 Final Examination 2 0.67 Total 45 15
Advantages• Great Strength• Light weight• Ease of fabrication• Uniformity• Elasticity• Permanence• Ductility• Toughness• Additions to existing structures• Ability to be fastened together by several simple connectors• Adaptation to prefabrication• Speed of erection• Ability to be rolled into wide variety of sizes and shapes• Reuse• Scrap value
Structural Steel Design, Fifth Edition, McCormac and Csernak, 2012 (International 10
Structural Steel
Disadvantages
• Corrosion• Fireproofing Cost• Susceptibility to buckling• Fatigue• Brittle fracture
Structural Steel Design, Fifth Edition, McCormac and Csernak, 2012 (International 11
Structural Steel
Effect of temperature on yield strength
Structural Steel Design, Fifth Edition, McCormac and Csernak, 2012 (International 12
First Completely Framed with Structural Steel Building
Completed in Chicago in 1890
Structural Steel Design, Fifth Edition, McCormac and Csernak, 2012 (International 13
Historical Note
Rolled-steel shapes
Structural Steel Design, Fifth Edition, McCormac and Csernak, 2012 (International 14
Cold-formed shapes
Structural Steel Design, Fifth Edition, McCormac and Csernak, 2012 (International 15
Concrete floor slabs• Cast on formed steel decks
Structural Steel Design, Fifth Edition, McCormac and Csernak, 2012 (International 16
Metric Units
• The metric equivalents of the standard U.S. shapes are provided in section 17 of AISCM
• W920 X 449 means 920 mm deep and weight 449 kg/m
Structural Steel Design, Fifth Edition, McCormac and Csernak, 2012 (International 17
Stress-Strain Relationships• Typical stress-strain diagram for mild or low-
carbon structural steel at room temperature
Structural Steel Design, Fifth Edition, McCormac and Csernak, 2012 (International 18
Stress-Strain Relationships• Typical stress-strain curves
Structural Steel Design, Fifth Edition, McCormac and Csernak, 2012 (International 19
Brittle steel
• Typical stress-strain diagram for brittle steel
Structural Steel Design, Fifth Edition, McCormac and Csernak, 2012 (International 20
ASTM Specification for Structural Shapes
Structural Steel Design, Fifth Edition, McCormac and Csernak, 2012 (International 21
Structural Steel Design, Fifth Edition, McCormac and Csernak, 2012 (International 22
Part of detail drawing
Structural Steel Design, Fifth Edition, McCormac and Csernak, 2012 (International 23
Part of erection drawing
Structural Steel Design, Fifth Edition, McCormac and Csernak, 2012 (International 24
Responsibilities of the Structural Designer
• Safety– Safely support loads– Control deflection– Control vibrations
• Cost– Standard size members– Simple connections and details– Low cost maintenance
• Constructability– Learn detailing– Learnt fabrication– Learn erection of steel
Structural Steel Design, Fifth Edition, McCormac and Csernak, 2012 (International 25
Building Code and Specifications
• Must refer to Building Code and Specifications• Local Building Code and Rules of
Municipalities• AISCS will be used for Structural steel
Structural Steel Design, Fifth Edition, McCormac and Csernak, 2012 (International 26
Loads
• Accurate estimation• Worst possible combinations• If no local code use ASCE 7 (ANSI 58.1
Standards)
Structural Steel Design, Fifth Edition, McCormac and Csernak, 2012 (International 27
Dead Loads
• Other are found in part 17 of AISCM
Structural Steel Design, Fifth Edition, McCormac and Csernak, 2012 (International 28
Live Loads• Typical minimum uniform table (p.55)
Structural Steel Design, Fifth Edition, McCormac and Csernak, 2012 (International 29
Live Loads
• Typical Concentrated Live Loads table 2.3 p55
Structural Steel Design, Fifth Edition, McCormac and Csernak, 2012 (International 30
Impact• Impact factor (p. 56)
Structural Steel Design, Fifth Edition, McCormac and Csernak, 2012 (International 31
Environmental Loads
• Snow• Rain• Wind• Earthquake
Structural Steel Design, Fifth Edition, McCormac and Csernak, 2012 (International 32
Two Design Methods
• LRFD (Load and Resistance Factor Design)– Reduction factor φ– Nominal Strength Rn
– Computed factored force Ru
– φ Rn ≥ Ru
• ASD (Allowable Strength Design)– Safety factor Ω– Largest computed force Ra
– ≥ Ra
Structural Steel Design, Fifth Edition, McCormac and Csernak, 2012 (International 33
Combined Loads