Search results for "Safety assessment"
showing 3 items of 3 documents
Vulnerability of a Damaged Bridge Abutment in a Seismic Area
2018
The case of the abutment of a motorway urban viaduct damaged by human intervention is presented. Built in the 1960s, it lies in a critical seismic area and the human-induced damage involved the elements of the abutment foundation. The structure is geometrically complex and the evaluations of its structural safety were carried out by applying Italian codes from different times: those concerning the time of construction, those of a recent past (1996), and those of the present (2008), inspired by Eurocodes. A comparison between the safety checks performed and the requirements of all these codes is presented and discussed, especially regarding safety coefficients after the damage was done. Two …
Safety Assessment and Migration Tests
2018
This chapter outlines (i) the advances to reduce the uncertainty in nanomaterials (NMs) determination; (ii) the results from migration experiments conducted with nano-clay, nanosilver, and other nanomaterial-containing polymers; and (iii) the different established protocols for risk assessment that ensure consumer's safety. The text starts highlighting the need of an understanding of potential exposure via migration into food and a deeper knowledge of the interaction of NMs with food constituents and their effects upon ingestion. The chapter covers the ability of the analytical techniques utilized to detect nanoparticles per se in food simulants. In addition, the results of the application …
TREEZZY2, a Fuzzy Logic Computer Code for Fault Tree and Event Tree Analyses
2004
In conventional approach to reliability analysis using logical trees methodologies, uncertainties in system components or basic events failure probabilities are approached by assuming probability distribution functions. However, data are often insufficient for statistical estimation, and therefore it is required to resort to approximate estimations. Moreover, complicate calculations are needed to propagate uncertainties up to the final results. In our work, in order to take account of the uncertainties in system failure probabilities, the methodology based on fuzzy sets theory is used both in fault tree and event tree analyses. This paper just presents our work in this issue, which resulted…