lecture_3

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Lecture 3 Load and Resistance Design (LRFD) Load Factors Types of Settlement and Causes Uniform Tilt Differential Suggested Tolerable Settlements – Under Service Conditions

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Prior Discussion, ASD Design Method: Allowable Stress Design (ASD) R n / FS Σ Q i – R n : Predicted Resistance FS : Factor of Safety – Q i : Load combination of Interest Generally Used to Size Footing (Width & Length) P D + P L + …. R n /FS
ASD LOAD Combinations The Design Load is the Most Critical Combination of Potential Load Sources D (2.1) D + L + F + H + T + (S or R) (2.2) 0.75 [D +L+ (S or R) + (W or E)] (2.3a) 0.75 [D + (W or E)] (2.4a) When designing we select the largest load from all 4 equations Above equations are applied to all types of loads (e.g. normal - P, shear - V, and moment – M)

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LRFD Design Method: Load and Resistance Factored Design (LRFD) φ R n η Σ γ i Q i – R n : Predicted Resistance φ : Resistance Factor γ I : Load Factor ( γ D = 1.2 Dead Load, γ L = 1.6 Live Load) – Q i
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