Russian Federation
This paper examines methodologies for predicting the fatigue strength of steel structures operating under conditions of repeated variable loading. Special attention is given to the theoretical foundations of fatigue failure, including the analysis of the stress-strain state of structures using analytical methods and numerical modeling. Experimental data on the fatigue life of steel specimens and welded joints obtained under various cyclic loading regimes are presented. Discrepancies between computational models and experimental results are discussed, and factors affecting the reduction of fatigue life, such as stress concentration, residual welding stresses, and corrosive environments, are identified. Recommendations for enhancing the fatigue strength of structures are developed, including geometry optimization, improvement of joint quality, and the implementation of regular monitoring systems.
fatigue strength, steel structures, repeated variable loads, finite element method, stress strain state, Wohler curves, Miner’s criterion, fatigue failure, durability prediction, stress concentration
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