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Author(s): Nuno Pereira
Xavier Romão
Raimundo Delgado
Title: Statistically-based survey plans to estimate the concrete strength in existing RC buildings
Issue Date: 2014
Abstract: In the proposed study, a framework for the definition of a safety factor leading to a reliableestimate of the mean concrete strength in existing reinforced concrete (RC) buildings is presented. Themain objective is to provide a methodology capable of establishing a reliable correlation between a givenlevel of knowledge that is required (which implies that a number of destructive tests have to be carriedout) and the confidence in the corresponding mean estimate of the strength that is obtained. Thedevelopment of this approach requires dividing the building into areas with a potentially homogeneousconcrete strength (e.g. each building storey). Furthermore, the methodology also uses the notion ofdiscrete structure where the concrete strength of each structural element of a given homogeneousbuilding section is assumed to be defined by a single strength value, which can be different than thoseof the remaining structural elements. The reliable value of the mean concrete strength is established bya boundary value defined according to an admissible variation with respect to the true mean value andincludes the effect of uncertainty due to sampling. This admissible variation is defined by a procedurethat uses both destructive and non-destructive test results. The referred boundary value allows thedefinition of a safety factor which represents the maximum admissible ratio between the true mean valueand the corresponding reliable estimate. The presented study also proposes an alternative approachregarding the definition of the Eurocode 8-Part 3 knowledge levels based on the relation between thenumber of structural members that were tested and the total number of structural members. An adaptiveconfidence factor for the mean value of the material strength is then provided for each knowledge levelas well as an approximation for the admissible global variability of the concrete strength in eachhomogeneous area of the discrete building. The proposed framework can be seen to be a more consistentstatistically-based alternative to the confidence factor values proposed by Eurocode 8-Part 3.
Subject: Engenharia estrutural, Engenharia civil
Structural engineering, Civil engineering
Scientific areas: Ciências da engenharia e tecnologias::Engenharia civil
Engineering and technology::Civil engineering
Source: Second European Conference on Earthquake Engineering and Seismology
Document Type: Artigo em Livro de Atas de Conferência Internacional
Rights: openAccess
Appears in Collections:FEUP - Artigo em Livro de Atas de Conferência Internacional

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