Transcription of Introduction to LRFD, Loads and Loads Distribution
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Introduction to LRFD, Loads and Loads Distribution
Introduction to LRFD1-1 Introduction to LRFD, Loads and Loads DistributionThomas K. Saad, Highway AdministrationChicago, ILEvolution of Design MethodologiesSLD Methodology:(ft)D+ (ft)L , (ft)D+ (ft)L FyLFD [ (ft)D+ 5/3(ft)L] Fy, (ft)D+ (ft)L Fy( by judgment) lrfd (ft)D+ (ft)L Fy( by calibration)(new live- load model) Introduction to LRFD1-2 Evolution of Design Methodologies (cont d)SLD does not recognize that some types of Loads are more variable than provides recognition that types of Loads are provides a probability-based mechanism to select load & resistance of Design Methodologies (cont d)As a result, lrfd achieves considerable improvement in the clustering of reliability indices versus the AASHTO Standard Specifications.
Introduction to LRFD 1-8 Resistance Factors (Article 6.5.4.2) Resistance factors, φ, for the strength limit state shall be taken as follows: • For flexure φf = 1.00 • For shear φv = 1.00 • For axial compression, steel only φc = 0.90 • For axial compression, composite φc = 0.90 • For tension, fracture in net section φu = 0.80 • For tension, yielding in gross section φy = 0.95
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