The original LRFD Specification values were calibrated to the ASD specification

Question

The original LRFD Specification values were calibrated to the ASD specification at a live load to dead load ratio of 3. Derive the relationship between factor of safety ? and the resistence factor ? by equating nominal strengths from ASD and LRFD. Consider the D+L for ASD and 1.2D + 1.6L for LRFD.

3. The original LRFD Specification values were calibrated to the ASD specification at a live load to dead load ratio of 3. Derive the relationship between factor of safety () and the resistance factor (0) by equating the nominal strengths from ASD and LRFD. Consider the D +L for ASD and 1.2D 1.6L for LRFD.

Explanation / Answer

= (1.2D/L+1.6)/ (D+L/L + 1 )

Here D/L is dead load to live load ratio therefore the eqation will be changed to = 5.2/ *5 (D/l = 3 given)

=1.04

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