Abstract
Fatigue crack propagation analyses for typical steel structural details are performed under various types of variable amplitude stresses which may approximately express the stress spectrum in various steel structures. On the basis of the analytical results, the relationship between threshold stress range to give the fatigue damage and the degree of fatigue damage is verified. By combining the relationship with the linear cumulative damage conception, a new procedure is proposed to predict the fatigue life under variable-amplitude stresses. Fatigue life estimated by the proposed procedure is compared with that predicted by previous procedures such as Miner's law, modified Miner's law, Haibach's procedure and so on, and with experimental results by Melhem et al.
