Pitting corrosion of the steel bars is a process that strongly jeopardizes the durability of reinforced concrete structures exposed to chlorides. This is a problem widely studied in order to evaluate structural lifetime. Nevertheless, the proper treatment of the noteworthy sources of uncertainty, that affect the numerical values of geometrical and mechanical structural parameters, is still an open question. Such properties, in fact, cannot be considered as deterministic quantities. In many real problems, very few uncertain data are available and new non-probabilistic procedures need to be defined to perform lifetime estimation. In the present study, parameters are modelled using fuzzy set theory and a time-dependent fuzzy safety factor is defined in order to indicate how the critical chloride front is distant from the bars. Moreover, the study provides a more proper mathematical analysis of chloride penetration into concrete and an improved calibrating procedure to estimate sampling model parameters, also accounting of time variability. The analysis confirms that the application of oversimplified Fick’s solutions leads to substantial conceptual errors in service lifetime estimation

Fuzzy lifetime prediction of RC structures subject to chlorides / Marano, Giuseppe Carlo; Giuseppe, Quaranta; Sara, Sgobba; Simona, Sasso; Notarnicola, Michele. - (2008). (Intervento presentato al convegno 11DBMC International Conference on Durability of Building Materials and Components tenutosi a Istanbul, Turkey nel May 11-14, 2008).

Fuzzy lifetime prediction of RC structures subject to chlorides

MARANO, Giuseppe Carlo;NOTARNICOLA, Michele
2008-01-01

Abstract

Pitting corrosion of the steel bars is a process that strongly jeopardizes the durability of reinforced concrete structures exposed to chlorides. This is a problem widely studied in order to evaluate structural lifetime. Nevertheless, the proper treatment of the noteworthy sources of uncertainty, that affect the numerical values of geometrical and mechanical structural parameters, is still an open question. Such properties, in fact, cannot be considered as deterministic quantities. In many real problems, very few uncertain data are available and new non-probabilistic procedures need to be defined to perform lifetime estimation. In the present study, parameters are modelled using fuzzy set theory and a time-dependent fuzzy safety factor is defined in order to indicate how the critical chloride front is distant from the bars. Moreover, the study provides a more proper mathematical analysis of chloride penetration into concrete and an improved calibrating procedure to estimate sampling model parameters, also accounting of time variability. The analysis confirms that the application of oversimplified Fick’s solutions leads to substantial conceptual errors in service lifetime estimation
2008
11DBMC International Conference on Durability of Building Materials and Components
Fuzzy lifetime prediction of RC structures subject to chlorides / Marano, Giuseppe Carlo; Giuseppe, Quaranta; Sara, Sgobba; Simona, Sasso; Notarnicola, Michele. - (2008). (Intervento presentato al convegno 11DBMC International Conference on Durability of Building Materials and Components tenutosi a Istanbul, Turkey nel May 11-14, 2008).
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11589/22679
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