Steel Design PDF
Preview Steel Design
Structural Steel Design by Rafael Sabelli, S.E. Disclaimer Instructional Material Complementing FEMA 1051, Design Examples Part 1: Background/Theoretical • Context in Provisions • Steel behavior • Reference standards and design strength • Moment resisting frames • Braced frames • Other topics • Summary Instructional Material Complementing FEMA 1051, Design Examples Steel Structures -2 Steel Design: Context in Provisions • Design basis: Strength limit state • Using the 2015 NEHRP Recommended Provisions, Refer to ASCE 7 2016: – Chap. 11: Seismic Design Criteria – Chap. 12: Seismic Design Requirements (Buildings) – Chap. 13: Nonstructural components – Chap. 14: Design of steel structures • Refers to AISC Specification (AISC 360-16) • Refers to AISC Seismic (AISC 341-16) Instructional Material Complementing FEMA 1051, Design Examples Steel Structures -3 Seismic Resisting Systems • Unbraced Frames • Connections are: – Fully Restrained Moment-resisting – Partially Restrained Moment-resisting • Seismic classes are: – Special Moment Frames – Intermediate Moment Frames – Ordinary Moment Frames – Systems not specifically detailed for seismic response • Braced Frames • Ordinary Concentric Braced Frames • Special Concentric Braced Frames • Eccentrically Braced Frames • Buckling Restrained Braced Frames • Special Plate Shear Walls • Systems not specifically detailed for seismic response Instructional Material Complementing FEMA 1051, Design Examples Steel Structures -4 Monotonic Stress-Strain Behavior Instructional Material Complementing FEMA 1051, Design Examples Steel Structures -5 Plastic Hinge Formation Plastic hinge in beam Instructional Material Complementing FEMA 1051, Design Examples Steel Structures -6 Behavior Modes For Beams Moment strain hardening B M D J idealized behavior p E F H K C inelastic LTB A G M r I elastic LTB L M O Deflection Instructional Material Complementing FEMA 1051, Design Examples Steel Structures -7 Flexural Ductility of Steel Members Practical Limits • Lateral torsional buckling – Provide sufficient lateral or torsional bracing • Local buckling – Limit width-to-thickness ratios for compression elements • Fracture – Avoid by proper detailing to allow inelastic strain Instructional Material Complementing FEMA 1051, Design Examples Steel Structures -8 Lateral Torsional Buckling Resisting u moment E A B L M p buckling M y with strain- hardening inelastic buckling C M e D elastic buckling 0 Laterally unbraced length Instructional Material Complementing FEMA 1051, Design Examples Steel Structures -9 Local Buckling b Classical plate buckling solution: 2 k E t cr y 2 2 12(1 )(b / t) Substituting = 0.3 and rearranging: b kE 0.95 t F y Instructional Material Complementing FEMA 1051, Design Examples Steel Structures -10
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