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Unformatted text preview: (5-14) 42 In Equation 5-14 the values of and are the lognormal mean and lognormal standard deviation respectively, + = 2 2 2 1 ln R R (5-15) 2 2 1 ln -= R (5-16) Where R and 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 5-2 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 = (5-17)...
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This note was uploaded on 10/19/2011 for the course TTE 4004c taught by Professor Hass during the Spring '11 term at University of Florida.
- Spring '11