The effect of materials on the reliability of reinforced concrete beams in normal and intense corrosions

• Autorzy: Ghanooni-Bagha M. , Shayanfar M. A. , Reza-Zadeh O. , Zabihi-Samani M.

Identyfikatory

DOI

10.17531/ein.2017.3.10

Warianty tytułu

PL

Wpływ stosowanych materiałów na niezawodność belek żelbetowych w warunkach normalnej i silnej korozji

• Języki publikacji: EN

Abstrakty

EN

Concrete structures are exposed to a variety of damages during their lifetime each of which could contribute to reducing their service life and load bearing capacity. Since most of parameters have special role in estimating capacity of members which are not certain, probabilistic evaluating the performance of concrete structures could bring more realistic perception about analysis and design of these structures. One of the most frequent probable damages is corrosion. The main focus of this study is placed on reliability assessment of flexural behavior of a reinforced concrete beam experienced pitting corrosion via Monte Carlo simulation. In addition, the effects of time to corrosion initiation, steel rebar diameter, yielding stress of rebars, strength class of cement, aggregate type and compressive strength of concrete, are included both in intense and normal pitting corrosion. The results clearly illustrate that occurrence of intense corrosion in concrete with low compressive strength, which used of higher strength class of cement and crushed stone aggregate, and less initial time for corrosion will lead to considerable reduction in service life even in some cases nearly half.

PL

W trakcie cyklu życia, konstrukcje betonowe są narażone na wiele uszkodzeń, z których każde może przyczyniać się do skrócenia ich żywotności i nośności. Ponieważ większość parametrów odgrywających szczególną rolę w szacowaniu nośności elementów cechuje niepewność, ocena probabilistyczna charakterystyk struktur betonowych może dawać bardziej realistyczny obraz analizy i projektowania tych struktur. Jednym z najczęściej występujących uszkodzeń struktur żelbetowych jest korozja. Głównym celem niniejszego badania była ocena niezawodności zachowania zginanej belki żelbetowej doświadczalnie poddanej korozji wżerowej poprzez symulację Monte Carlo. Ponadto, badano oddziaływanie czasu inkubacji korozji, średnicy stalowych prętów zbrojeniowych, granicy plastyczności tych prętów, klasy wytrzymałości cementu, rodzaju kruszywa i wytrzymałości na ściskanie betonu zarówno w warunkach silnej jak i normalnej korozji wżerowej. Wyniki jasno pokazują, że wystąpienie silnej korozji w betonie o małej wytrzymałości na ściskanie, do produkcji którego wykorzystano cement i kruszywo kamienne o wyższej klasie wytrzymałości, oraz krótszy czas inkubacji korozji prowadzą do znacznego skrócenia żywotności belek, w niektórych przypadkach nawet prawie o połowę.

Słowa kluczowe

EN

failure probability; Monte Carlo simulation; pitting corrosion; flexural capacity; RC beams

PL

prawdopodobieństwo awarii; symulacja Monte Carlo; korozja wżerowa; nośność na zginanie; belka żelbetowa

• Wydawca: Polskie Naukowo-Techniczne Towarzystwo Eksploatacyjne
• Czasopismo: Eksploatacja i Niezawodność
• Rocznik: 2017
• Tom: Vol. 19, no. 3
• Strony: 393--402
• Opis fizyczny: Bibliogr. 41 poz., rys.

Twórcy

autor

Ghanooni-Bagha M.

• Department of Civil Engineering, East Tehran Branch Islamic Azad University Tehran, Iran

autor

Shayanfar M. A.

• The Centre of Excellence for Fundamental Studies in Structural Engineering Iran University of Science and Technology P.o.BoX: 16765-163; Narmak, Tehran, Iran

autor

Reza-Zadeh O.

• School of Civil Engineering Iran University of Science and Technology P.o. Box 16765-163, Narmak, Tehran, Iran

autor

Zabihi-Samani M.

• Department of Civil Engineering, Parand Branch Islamic Azad University Parand, Iran

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