Results of stress analysis in different elements of the three tested bridges are presented in this paper. The methodology of bridges fatigue life estimation is presented. Results obtained from empirical tests have been compared with results abtained using the "rain flow" method. Also the artifical neural network has been recognized as an useful method of fatigue life assessment of steel bridges.
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The problem of the transient resonance in the stochastic formulation has been considered. After introducing new variables and applying the Ito differentiation formula a set or differential equations for finding the probabilistic moments of the system response have been obtained. The approach is illustrated by calculating the probabilistic moments of the displacements of concrete foundation excited by a vibrating machine.
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