Pilot comparison of safety formats for reliability assessment of RC structures

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F28399269%3A_____%2F19%3AN0000007" target="_blank" >RIV/28399269:_____/19:N0000007 - isvavai.cz</a>

Nalezeny alternativní kódy

RIV/00216305:26110/19:PU132269 RIV/68407700:21610/19:00331722

Výsledek na webu

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DOI - Digital Object Identifier

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Jazyk výsledku

angličtina

Název v původním jazyce

Pilot comparison of safety formats for reliability assessment of RC structures

Popis výsledku v původním jazyce

The use of partial factors can be a pragmatic and sufficient approach for many structural systems. However, the global safety concept or the probabilistic approach seem to be more appropriate in cases with strong non-linear behaviour, dominating role of tensile and fracture-mechanical properties, or with multiple failure modes of similar importance. The probabilistic approach makes it possible to realistically consider the randomness of input parameters such as material, geometrical, and load characteristics. fib Model Code 2010 (MC2010) introduced a comprehensive system for the treatment of reliability and model uncertainty for structural assessment and design based on nonlinear analysis. Focusing on resistance variables, non-linear finite element analysis (NLFEA) can be based on one of the following safety formats: 1. Partial factor method (PFM) using design values of material properties. 2. Global resistance methods – MC2010 makes distinction between two approaches: a. The analysis based on mean properties of reinforcement, modified characteristics of concrete and a single value of global partial factor (GF). b. Estimation of a coefficient of variation of resistance ECoV, requiring two structural analyses. 3. Probabilistic method is the most accurate, but also the most demanding approach. This study analyses a simply supported RC beam tested in shear resistance, for which steel yielding or concrete failure can be observed by varying shear reinforcement ratio (Figure 1). The effect of different failure modes is investigated by comparing design resistance obtained by the three safety formats. The MC2010 Level of Approximation 3 (LoA3) is applied to represent models that combine the reinforcement and concrete contributions - “parallel system”. A reference solution is provided by the probabilistic approach that accounts the correlation between the failure modes. The results are compared with the previous study (Cervenka et al. 2018) where the structural resistance was taken as a minimum of the reinforcement yielding and concrete crushing – “series system”.

Název v anglickém jazyce

Pilot comparison of safety formats for reliability assessment of RC structures

Popis výsledku anglicky

The use of partial factors can be a pragmatic and sufficient approach for many structural systems. However, the global safety concept or the probabilistic approach seem to be more appropriate in cases with strong non-linear behaviour, dominating role of tensile and fracture-mechanical properties, or with multiple failure modes of similar importance. The probabilistic approach makes it possible to realistically consider the randomness of input parameters such as material, geometrical, and load characteristics. fib Model Code 2010 (MC2010) introduced a comprehensive system for the treatment of reliability and model uncertainty for structural assessment and design based on nonlinear analysis. Focusing on resistance variables, non-linear finite element analysis (NLFEA) can be based on one of the following safety formats: 1. Partial factor method (PFM) using design values of material properties. 2. Global resistance methods – MC2010 makes distinction between two approaches: a. The analysis based on mean properties of reinforcement, modified characteristics of concrete and a single value of global partial factor (GF). b. Estimation of a coefficient of variation of resistance ECoV, requiring two structural analyses. 3. Probabilistic method is the most accurate, but also the most demanding approach. This study analyses a simply supported RC beam tested in shear resistance, for which steel yielding or concrete failure can be observed by varying shear reinforcement ratio (Figure 1). The effect of different failure modes is investigated by comparing design resistance obtained by the three safety formats. The MC2010 Level of Approximation 3 (LoA3) is applied to represent models that combine the reinforcement and concrete contributions - “parallel system”. A reference solution is provided by the probabilistic approach that accounts the correlation between the failure modes. The results are compared with the previous study (Cervenka et al. 2018) where the structural resistance was taken as a minimum of the reinforcement yielding and concrete crushing – “series system”.

Druh

D - Stať ve sborníku

CEP obor

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OECD FORD obor

20102 - Construction engineering, Municipal and structural engineering

Projekt

Výsledek vznikl pri realizaci vícero projektů. Více informací v záložce Projekty.

Návaznosti

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Rok uplatnění

2019

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název statě ve sborníku

Proceedings of the fib Symposium 2019: Concrete - Innovations in Materials, Design and Structures

ISBN

978-294064300-4

ISSN

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e-ISSN

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Počet stran výsledku

8

Strana od-do

2076-2083

Název nakladatele

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Místo vydání

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Místo konání akce

Krakow, Poland

Datum konání akce

27. 5. 2019

Typ akce podle státní příslušnosti

EUR - Evropská akce

Kód UT WoS článku

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