Fatigue Reliability and Design

by James T. P. Yao, (M.ASCE), Prof. of Civ. Engrg.; Purdue Univ., West Lafayette, IN,

Serial Information: Journal of the Structural Division, 1974, Vol. 100, Issue 9, Pg. 1827-1836

Document Type: Journal Paper

Abstract: At present, the fatigue provision in most design specifications in this country is based upon test data presented in the form of modified Goodman diagrams. The recent AISC specification is based upon a constant-range criterion. In any event, neither the randomness of fatigue lives nor that of applied loads is being considered. In this paper, a simple and reliability-based procedure is presented for the fatigue design of structures. The probability distribution for repeated loads can be obtained from dynamic analysis or field measurements. In addition, the stress-life-probability relations are available from single-stress-level laboratory tests. With an initial configuration of the structure, the distribution of repeated stresses can be computed. Then, the life of the structure can be predicted using a cumulative-damage criterion and an acceptable probability of failure. The computed life is compared with the design life, and the design can be modified in an iterative manner.

Subject Headings: Lifeline systems | Fatigue tests | Repeated loads | Structural reliability | Probability | Load distribution |

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