CIVL439/WO0D476 Decay in a poorly constructod bullding Reliability and Safety Safety Factors Strength distnbution p Load.Resistance Load.Resistance Safety factors Safety Index B=Safoty Inde Load,Resistance e-Lead 6 CIVL439/WOOD476 6 Preservative treatment of wood in marine environment Decay in a poorly constructed building envelope Reliability and Safety o Load ccurrence distribution Load, Resistance Probability of o Probability of failure (overlap area) Resistance distribution Safety Factors Load distribution Strength distribution occurrence Load, Resistance Probability of Probability of failure (overlap area) Lavg Ravg Global safety factor = Ravg/Lavg Safety factors Load distribution occurrence Load, Resistance Probability of Measure of safety Resistance distribution 95th percentile 5th percentile Nominal safety factor = R95/L05 L95 R05 Safety Index Load distribution Strength distribution Probability of occurrence currence Resistance - Load Probability of failure (overlap area) Probability of occ (Resistance – Load) distribution β (SDEV) Probability of β = Safety Index failure