000013098 001__ 13098
000013098 005__ 20161114160327.0
000013098 04107 $$aeng
000013098 046__ $$k2009-06-22
000013098 100__ $$aFranchin, P.
000013098 24500 $$aAdequacy of a single confidence factor to account for epistemic uncertainty in the seismic assessment of existing structures

000013098 24630 $$n2.$$pComputational Methods in Structural Dynamics and Earhquake Engineering
000013098 260__ $$bNational Technical University of Athens, 2009
000013098 506__ $$arestricted
000013098 520__ $$2eng$$aEurocode 8 Part 3 (EC8-3) is devoted to assessment and retrofitting of existing buildings. In order to take into account the uncertainty in the knowledge of structural properties, EC8-3 defines, in addition to the ordinary material partial factors, an adjustment factor, called “confidence factor (CF)”, whose value depends on the level of knowledge (KL) of properties such as geometry, reinforcement layout and detailing, and materials. This solution is plausible from a logical point of view but it cannot yet profit from the experience of its use in practice, hence it needs to be substantiated by a higher level probabilistic analysis accounting for and propagating epistemic uncertainty (i.e., incomplete knowledge of a structure) throughout the seismic assessment procedure. The paper investigates the soundness of the format proposed in EC8-3 and pinpoints some problematic aspects that would require refinement. The approach taken rests on the simulation of the entire assessment procedure and the evaluation the distribution of the assessment results (distance from the limit state of interest) conditional on the acquired knowledge. Based on this distribution a criterion is proposed to calibrate the CF values. The obtained values are then critically examined and compared with code-specified ones. The methodological significance of the work extends beyond the assessment procedure in EC8-3, since similar factors appear in other international guidelines (e.g. the knowledge factor of FEMA356).

000013098 540__ $$aText je chráněný podle autorského zákona č. 121/2000 Sb.
000013098 653__ $$aReinforced concrete, Testing and Inspection, Reinforcement details, Material properties, Modeling assumptions, Analysis method, Knowledge level. Abstract. Eurocode 8 Part 3 (EC8-3) is devoted to assessment and retrofitting of existing buildings. In order to take into account the uncertainty in the knowledge of structural properties, EC8-3 defines, in addition to the ordinary material partial factors, an adjustment factor, called “confidence factor (CF)”, whose value depends on the level of knowledge (KL) of properties such as geometry, reinforcement layout and detailing, and materials. This solution is plausible from a logical point of view but it cannot yet profit from the experience of its use in practice, hence it needs to be substantiated by a higher level probabilistic analysis accounting for and propagating epistemic uncertainty (i.e., incomplete knowledge of a structure) throughout the seismic assessment procedure. The paper investigates the soundness of the format proposed in EC8-3 and pinpoints some problematic aspects that would require refinement. The approach taken rests on the simulation of the entire assessment procedure and the evaluation the distribution of the assessment results (distance from the limit state of interest) conditional on the acquired knowledge. Based on this distribution a criterion is proposed to calibrate the CF values. The obtained values are then critically examined and compared with code-specified ones. The methodological significance of the work extends beyond the assessment procedure in EC8-3, since similar factors appear in other international guidelines (e.g. the knowledge factor of FEMA356).

000013098 7112_ $$aCOMPDYN 2009 - 2nd International Thematic Conference$$cIsland of Rhodes (GR)$$d2009-06-22 / 2009-06-24$$gCOMPDYN2009
000013098 720__ $$aFranchin, P.$$iPinto P., E.$$iRajeev, P.
000013098 8560_ $$ffischerc@itam.cas.cz
000013098 8564_ $$s529346$$uhttps://invenio.itam.cas.cz/record/13098/files/CD131.pdf$$yOriginal version of the author's contribution as presented on CD, section: Statistical and probabilistic methods in computational mechanics to treat aleatory and epistemic uncertainties in structural and/or geotechnical systems and their loading environment - iii (MS).
000013098 962__ $$r13074
000013098 980__ $$aPAPER