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Lifetime prediction of steel component exposed to time-dependent corrosion effects

Lifetime prediction of steel component exposed to time-dependent corrosion effects. David Pustka. V ŠB – Technical University of Ostrava Faculty of Civil Engineering Ludvíka Podéš tě 1875 , 708 00 Ostrava, Czech Republic. Introduction.

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Lifetime prediction of steel component exposed to time-dependent corrosion effects

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  1. Lifetime prediction of steel component exposed to time-dependent corrosion effects David Pustka VŠB – Technical University of Ostrava Faculty of Civil Engineering Ludvíka Podéště 1875, 708 00 Ostrava, Czech Republic

  2. Introduction • Subject of the discussion is application of SBRA method in reliability analysis of a beam exposed to time-dependent corrosion effects. • The inspections planning and application of evaluated inspection data can lead to more precise estimate of the actual structure lifetime – as is demonstrated on the following example.

  3. Example assignment • Simply supported steel beam exposed to time-dependent corrosion effects:

  4. A priori estimates of load components • Time-dependent random variable load components:

  5. A priori estimate of section modulus • Time-dependent random variable section modulus:

  6. A-priori estimate of resistance and load effects referring to bending • The relation of time-dependent resistance and time-dependent load effects:

  7. Calculation of the probability of failure Reliability function RFcorresponding to timeT=25 years:

  8. The probability of failure estimates Time-dependent probability of failure estimates:

  9. Summary and conclusion • The utilization of SBRA method in the framework of structural engineering design can be extended to reliability analysis of structures exposed to time-dependent degradation processes. • The presented approach allows to propose inspection intervals and, using the evaluated data,more precise estimate the actual safe lifetime of the structure.

  10. Thank you for attention …

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