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Stochastic fatigue crack growth in steel structures subject to random loading |
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| Authors: | Ruohua Zheng Bruce R Ellingwood |
| Affiliation: | a Mobil Technology Company, Dallas, TX 75247, USA b Deptartment of Civil Engrineering, Johns Hopkins University, Baltimore, MD 21218, USA |
| Abstract: | Uncertainty in fatigue crack growth under service load conditions arises from the statistical characteristics of crack growth under constant amplitude loading and from random variable amplitude loading. This study generalizes previous stochastic fatigue crack growth models by incorporating a time-dependent noise term described by arbitrary marginal distributions and autocorrelations to model the uncertainty in the crack growth under constant amplitude loading. A computationally efficient approach for handling wide-band random loadings based on the rainflow method of stress cycle identification also is developed. The method is illustrated with a fatigue reliability analysis of a steel miter gate at a lock and dam facility operated by the US Army Corps of Engineers. |
| Keywords: | Steel structures Fatigue of materials Crack propagation Structural analysis Structural loads Markov processes Mathematical models Probability density function Statistical methods Random loading Power spectral density function |
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