Structural Design Guide

I I This book is intended to guide practicing structural engineers into more profitable routine designs with the AISC Load and Resistance Factor Design Specification (LRFD) for structural steel buildings. LRFD is a method of proportioning steel structures so that no applica ble limit state is exceeded when the structure is subjected to all appro priate factored load combinations. Strength limit states are related to safety, and concern maximum load carrying capacity, Serviceability limit states are related to performance under service load conditions such as deflections. The term "resistance" includes both strength states and serviceability limit states. LRFD is a new approach to the design of structural steel for buildings. It involves explicit consideration of limit states, multiple load factors and resistance factors, and implicit probabilistic determination of relia bility. The type of factoring used by LRFD differs from the allowable stress design of Chapters A through M of the 1989 Ninth Edition of the AISC Specifications for Allowable Stress Design, where only the resistance is divided by a factor of safety to obtain an allowable stress, and from the plastic design provisions of Chapter N, where the loads are multi plied by a common load factor of 1.7 for gravity loads and 1.3 for gravity loads acting with wind or seismic loads. LRFD offers the structural engineer greater flexibility, rationality, and economy than the previous 1989 Ninth Edition of the AISC Specifications for Allowable Stress Design.

Zusammenfassung
Explains the American Institute for Steel Construction (AISC) Load and Resistance Factor Design (LRFD) Specifications and Commentary. This guide provides readers with specification interpretations, analysis and design examples, and graphs providing solutions to complex code formulas.

Inhalt
1Structural Materials and Economics: Specifications, Testing, and Inspection /.- Materials and Specifications /.- Testing and Inspection /.- Economics and the Choice of Materials /.- 2Structural Analysis and LRFD Design /.- General /.- Pure Flexure/.- Shear/.- Loads, Load Factors, and Load Combinations/.- Elastic Analysis for One-Story Structures/.- Elastic Analysis for Multistory Structures/.- 3Beams and Girders as Flexural Members /.- Beam Example 1: Simple Span Roof Beam, Simple Framing Construction/.- Beam Example 2: Exterior Span Roof Beam, Rigid Frame (Fully Restrained) Construction/.- Beam Example 3: Cantilevered Suspended Span, Interior/.- Beam Example 4: Cantilevered Suspended Span, Exterior/.- Beam Example 5: Simple Spar Office Floor Beam, SF Construction/.- Beam Example 6: 5th Floor Exterior Span Floor Beam, FR (Fully Restrained) Construction for 10-Story Office Building/.- 4Trusses /.- General/.- Design Example 1: Simple Span Welded Roof Truss, Grade 50 Chords and Grade 36 Web/.- Design Example 2: Typical Roof Truss Connection, Detail of Top Chord and Web Members/.- 5Connections /.- General/.- Scope/.- Rivets/.- Bolts/.- Welds/.- Connection Design/.- Joint Design Examples/.- 6Columns /.- Definitions/.- Column Design: Conditions/.- Slenderness Effects in Axially-Loaded Columns of Braced Frames/.- Axial Compression and Bending/.- Braced Frames/.- Axial Compression and Bending with Lateral Forces: Columns in Unbraced Frames/.- Arbitrary Allowance by Specifications/.- Individual Column Design/.- Design Examples Using Specification Formulas with Primary Analysis Data/.- Appendices /.- A1. Beam Selection Table /.- A2. One-Story Rigid Frames /.- A3. Interior Span of Cantilevered Span System /.- A4. Exterior Span of Cantilevered Span System /.- A5.Truss: Continuous Chords, Pinned Diagonals and Verticals /.- A6. 5th Floor Gravity Loads: 10-Story Building /.- A7. 10-Story Office Building: Wind Loads /.- AISC Specification Section Index /.- Subject Index /.