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Unformatted text preview: factor) that result in equivalent physical dimensions of a substructure or superstructure as by ASD. It does not provide a better or more uniform margin of safety. In order to calibrate the ASD method, the first step is to rewrite equations 52 and 53 as 38 L D n Q Q FS R + ≥ (54) D D L L n Q Q R γ φ + ≥ (55) It should be noted that the loads only include dead and live loads. Environmental loads (i.e. wind, earthquake, etc) were not taken into consideration for the derivation of the ASD fitting equation. Solving both equations for R n we obtain ( 29 L D n Q Q FS R + ≥ (56) ( 29 D D L L n Q Q R + ≥ (57) Setting Equation 56 equal to Equation 57 and solving for φ ( 29 D L D D L L Q Q FS Q Q + + = (58) Dividing both the numerator and the denominator of Equation 58 by Q L + + = 1 L D L D L D Q Q FS Q Q (59)...
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 Spring '11
 Hass
 Statistics, Probability, Reliability theory, Interval finite element, LRFD

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