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Structures 5

Structures 5. 803425-2. Mohammed Alsabban. masabban@uqu.edu.sa Office : 1153 Ext. 1142 Office Hours: (look up university site). Text. Name: Structural Steel Design Fifth Edition (International) Authers : Jack C. McCormac and Stephen F. Csernak Publisher: Pearson 2012. Manual.

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Structures 5

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  1. Structures 5 803425-2

  2. Mohammed Alsabban • masabban@uqu.edu.sa • Office : 1153 • Ext. 1142 • Office Hours: (look up university site)

  3. Text • Name: Structural Steel Design • Fifth Edition (International) • Authers: Jack C. McCormac and Stephen F. Csernak • Publisher: Pearson • 2012

  4. Manual • 14th edition of the Steel Construction Manual (AISCM) • Based on the 2010 Specification for Structural Steel Buildings (ANSI / AISC 360-10), (AISCS)

  5. Grading • Attendance 10% • Homework 10% • 1st Exam 10 % • 2Nd Exam 10% • 3rd Exam 10% • 4th Exam 10% • Final Exam 40%

  6. Grading • Attendance 10% • Homework 10% • 1st Exam 10 % - Tension Members • 2Nd Exam 10% - Columns • 3rd Exam 10% - Beams • 4th Exam 10% - Beam - Columns • Connections • Final Exam 40%

  7. 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

  8. Disadvantages • Corrosion • Fireproofing Cost • Susceptibility to buckling • Fatigue • Brittle fracture

  9. First Completely Framed with Structural Steel Building • Completed in Chicago in 1890

  10. Rolled-steel shapes

  11. 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

  12. Cold-formed shapes

  13. Concrete floor slabs • Cast on formed steel decks

  14. Stress-Strain Relationships • Typical stress-strain diagram for mild or low-carbon structural steel at room temperature

  15. Stress-Strain Relationships • Typical stress-strain curves

  16. Effect of temperature on yield strength

  17. Brittle steel • Typical stress-strain diagram for brittle steel

  18. ASTM Specification for Structural Shapes

  19. Part of detail drawing

  20. Part of erection drawing

  21. 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

  22. 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

  23. Loads • Accurate estimation • Worst possible combinations • If no local code  use ASCE 7 (ANSI 58.1 Standards)

  24. Dead Loads • Other are found in part 17 of AISCM Structural Steel Design, Fifth Edition, McCormac and Csernak, 2012 (International 25

  25. Live Loads • Typical minimum uniform table (p.55)

  26. Live Loads • Typical Concentrated Live Loads table 2.3 p55

  27. Impact • Impact factor(p. 56)

  28. Environmental Loads • Snow • Rain • Wind • Earthquake

  29. Two Design Methods • LRFD (Load and Resistance Factor Design) • Reduction factor φ • Nominal Strength Rn • Computed factored force Ru • φRn ≥ Ru • ASD (Allowable Strength Design) • Safety factor Ω • Largest computed force Ra • ≥ Ra

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