Consistent Partial Safety Factors

by Niels C. Lind, (A.M.ASCE), Prof.; Dept. of Civ. Engrg., Univ. of Waterloo, Waterloo, Ontario, Canada,

Serial Information: Journal of the Structural Division, 1971, Vol. 97, Issue 6, Pg. 1651-1669

Document Type: Journal Paper


Several reliability-based structural code formats have been suggested in recent literature. To clarify their logical structure their differences and similarities are compared with reference to a set of formal postulates. Such a set is outlined and explained in detail: a postulate concerning the nature of the load; of the strength; a design procedure; a design principle (constant reliability with respect to a formal model and a body of knowledge); and other postulates relating to the format of an individual code. It is shown how a partial safety factor format can be calibrated to achieve nearly constant reliability within the framework of a member-by-member design theory. Explicit results are given for a simple second moment theory, and calibration is illustrated by an example.

Subject Headings: Structural reliability | Standards and codes | Load and resistance factor design | Calibration | Wood structures | Safety | Frames | Moment (mechanics)

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