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Introduction to the design of statically indeterminate structures according PBD method using SBRA approach
Guštar, M. ; Marek, Pavel
Probabilistic methods application in civil engineering is not limited to the reliability assessment of structures only. As the denotation of Performance Based Design methodology suggests, probabilistic methods should allow the direct design of structures components with respect to the specified reliability conditions. In simplest cases the direct probabilistic design of individual members of the structure can be done easily, however the computational complexity grows rapidly with the number of the interconnected members and the number of the conditions to be satisfied. The situation is demonstrated in the following example.
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Design Against Brittle of Elastic-Plastic Fracture of Nuclear Waste Container
Pluvinage, G. ; Lenkey, G. B. ; Dlouhý, Ivo
Design against brittle or elastic plastic fracture of nuclear waste container is discussed based on three different concepts:(i)reserve of ductility defined by means of reference temperature,(ii)deterministic design using linear or elasto-plastic fracture mechanics associated with reserve factors,and (iii)probabilistic design associated with RCC-MR failure assessment diagram. Cast ferritic steel predetermined for containers of spent nuclear fuel has been used in experimental part of the study.Fracture toughness characteristics necessary for considerations have been obtained by standard 1T three point bend specimens tested statically at different temperatures.Pre-cracked Charpy type specimen has been also employed for the investigations tested statically and dynamically.Material properties necessary for the concept presented are corresponding Master Curve and Weibull distribution of fracture toughness.Special attention has been paid to dynamic loading.Large scatter in reserve factor was found depending on the selected failure assessment method for fracture toughness characteristics changing the value from 1.44 to 4.55.
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