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Unformatted text preview: (514) 42 In Equation 514 the values of Î¸ and Î¶ are the lognormal mean and lognormal standard deviation respectively, + = 2 2 2 1 ln R R Î» Ïƒ Î¾ (515) 2 2 1 ln Î¸= R (516) Where Ïƒ R and Î» R are the standard deviation and the mean of the resistance as defined in prior sections. LRFD components Probability of failure. The LRFD approach defines the probability of failure of a structure based on the load and resistance distribution curves. Figures 52 shows the probability density functions for normally distributed load and resistance. The shaded area represents the region of failure where the resistance is smaller than the loads. For the load and resistance curves, the margin of safety can be defined in terms of the probability of survival as ( 29 Q R P p s = (517)...
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 Spring '11
 Hass
 Normal Distribution, probability density function, AASHTO

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