Assessment of the reliability of trusses in case of corrosion wear based on simulation modeling

The paper considers the problem of probabilistic assessment of the reliability of truss metal structures, taking into account corrosion wear. Corrosion wear is represented as the accumulation of damage, and the corrosion state of an element is considered from the undamaged level to the limit state corresponding to failure (loss of stability of a rod element of a truss structure). Degradation is described by a sequence of probabilistic transitions between states within a continuous-time Markov model. The time dependencies of the transition probabilities are reconstructed from experimental observations and approximated by parametric dependencies, which allows us to form a consistent time transition matrix for the entire state scale. After the model is calibrated, Monte Carlo simulations are performed for individual rod elements of the truss structure and for the truss system as a whole, taking into account the varying structural significance of the elements. This allows us to obtain reliability estimates and damage accumulation characteristics, which can be used for engineering diagnostics and repair decision-making.

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