000013119 001__ 13119
000013119 005__ 20161114160328.0
000013119 04107 $$aeng
000013119 046__ $$k2009-06-22
000013119 100__ $$aPetrini, F.
000013119 24500 $$aThe role of uncertainty in aeolian risk assessment

000013119 24630 $$n2.$$pComputational Methods in Structural Dynamics and Earhquake Engineering
000013119 260__ $$bNational Technical University of Athens, 2009
000013119 506__ $$arestricted
000013119 520__ $$2eng$$aThe design of wind sensitive structures must take into account many sources of uncertainty related to: (a) the basic environmental parameters that describe the wind field at the site, like mean wind velocity, turbulence intensity, wind direction, etc.; (b) the structural and mechanical properties, like stiffness and damping; (c) the parameters that influence the windstructure interaction (aerodynamic coefficients, flutter derivates, Strohual number, etc.). Roughly, three categories of uncertainty can be distinguished: the aleatoric uncertainty, related to the natural variability of the parameters and their unpredictability; the epistemic uncertainty related both to the lack of information and to the errors of experimental measures; the model uncertainty related to the choice of the models of wind action, structural response and interaction phenomena. In this paper, specific reference is made to the optimal design of a long span suspension bridge: the effects of the three types of uncertainty on the Aeolian risk assessment of the bridge are evaluated. The attention is focused on the minimum information needed to characterize satisfactorily the wind field, since the data available today (essentially, turbulence spectra and maps of expected wind speeds) are rather limited. The influence of model uncertainty is investigated with reference to buffeting, by implementing different formulations in time domain of the aeroelastic forces. The relevance of epistemic uncertainty is investigated in evaluating the flutter stability, by a parametric analysis that assumes different values of the aerodynamic coefficients. Finally, the relevance of aleatoric uncertainty that characterize the mean wind velocity is considered in assessing the fatigue life of the secondary suspension cable system under buffeting effects. The final aim of these studies is the development of procedures for Performance-Based Wind Engineering, whose general framework is illustrated in [4].

000013119 540__ $$aText je chráněný podle autorského zákona č. 121/2000 Sb.
000013119 653__ $$aPerformance-Based Wind Engineering, Wind Actions, Uncertainty, Aeolian Risk, Reliability Assessment. Abstract. The design of wind sensitive structures must take into account many sources of uncertainty related to: (a) the basic environmental parameters that describe the wind field at the site, like mean wind velocity, turbulence intensity, wind direction, etc.; (b) the structural and mechanical properties, like stiffness and damping; (c) the parameters that influence the windstructure interaction (aerodynamic coefficients, flutter derivates, Strohual number, etc.). Roughly, three categories of uncertainty can be distinguished: the aleatoric uncertainty, related to the natural variability of the parameters and their unpredictability; the epistemic uncertainty related both to the lack of information and to the errors of experimental measures; the model uncertainty related to the choice of the models of wind action, structural response and interaction phenomena. In this paper, specific reference is made to the optimal design of a long span suspension bridge: the effects of the three types of uncertainty on the Aeolian risk assessment of the bridge are evaluated. The attention is focused on the minimum information needed to characterize satisfactorily the wind field, since the data available today (essentially, turbulence spectra and maps of expected wind speeds) are rather limited. The influence of model uncertainty is investigated with reference to buffeting, by implementing different formulations in time domain of the aeroelastic forces. The relevance of epistemic uncertainty is investigated in evaluating the flutter stability, by a parametric analysis that assumes different values of the aerodynamic coefficients. Finally, the relevance of aleatoric uncertainty that characterize the mean wind velocity is considered in assessing the fatigue life of the secondary suspension cable system under buffeting effects. The final aim of these studies is the development of procedures for Performance-Based Wind Engineering, whose general framework is illustrated in [4].

000013119 7112_ $$aCOMPDYN 2009 - 2nd International Thematic Conference$$cIsland of Rhodes (GR)$$d2009-06-22 / 2009-06-24$$gCOMPDYN2009
000013119 720__ $$aPetrini, F.$$iCiampoli, M.$$iAugusti, G.
000013119 8560_ $$ffischerc@itam.cas.cz
000013119 8564_ $$s795825$$uhttps://invenio.itam.cas.cz/record/13119/files/CD157.pdf$$yOriginal version of the author's contribution as presented on CD, section: Statistical and probabilistic methods in computational mechanics to treat aleatory and epistemic uncertainties in structural and/or geotechnical systems and their loading environment - iii (MS).
000013119 962__ $$r13074
000013119 980__ $$aPAPER