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Long term simulation of wind-induced fatigue loadings
HighlightsThe simulation of 50years wind-induced fatigue loadings of a slender steel structure is presented.The benchmark annual fatigue damage is obtained by applying Rainflow counting to concatenated 3days long time series.The benchmark solution is adopted to discuss the classical fatigue analysis approach.The role of the length of the stress time series for annual fatigue damage evaluation is discussed.The variability of the annual damage over the 50year simulation is highlighted and discussed.
AbstractThis paper deals with the fatigue analysis of slender structures subjected to the wind action. A 50-year conditioned Monte Carlo simulation of the bending moment at the base of a steel lighting pole is performed. Long-term simulations of the static part of the bending moment, related to the mean wind speed, are combined with short-term fluctuations due to the turbulence. Multiple time series of the stress at the base of the pole, with length ranging between 10min and 3days, are generated and processed by means of the Rainflow counting algorithm. The resulting large size data set of the fatigue damage is analyzed in order to clarify some cloudy issues related to the fatigue analysis: the contribution to the damage of the low-frequency, large-amplitude cycles in the stress-time series; the contribution of the transition cycles between consecutive wind states; the length of the stress-time series necessary to get a reliable stress cycle histogram in the framework of the classical state approach; the variability of the damage resulting from a given mean wind speed; the variability of the annual damage.
Long term simulation of wind-induced fatigue loadings
HighlightsThe simulation of 50years wind-induced fatigue loadings of a slender steel structure is presented.The benchmark annual fatigue damage is obtained by applying Rainflow counting to concatenated 3days long time series.The benchmark solution is adopted to discuss the classical fatigue analysis approach.The role of the length of the stress time series for annual fatigue damage evaluation is discussed.The variability of the annual damage over the 50year simulation is highlighted and discussed.
AbstractThis paper deals with the fatigue analysis of slender structures subjected to the wind action. A 50-year conditioned Monte Carlo simulation of the bending moment at the base of a steel lighting pole is performed. Long-term simulations of the static part of the bending moment, related to the mean wind speed, are combined with short-term fluctuations due to the turbulence. Multiple time series of the stress at the base of the pole, with length ranging between 10min and 3days, are generated and processed by means of the Rainflow counting algorithm. The resulting large size data set of the fatigue damage is analyzed in order to clarify some cloudy issues related to the fatigue analysis: the contribution to the damage of the low-frequency, large-amplitude cycles in the stress-time series; the contribution of the transition cycles between consecutive wind states; the length of the stress-time series necessary to get a reliable stress cycle histogram in the framework of the classical state approach; the variability of the damage resulting from a given mean wind speed; the variability of the annual damage.
Long term simulation of wind-induced fatigue loadings
Repetto, Maria Pia (author) / Torrielli, Alessio (author)
Engineering Structures ; 132 ; 551-561
2016-11-22
11 pages
Article (Journal)
Electronic Resource
English
Long term simulation of wind-induced fatigue loadings
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