ANIDIS - L'ingegneria Sismica in Italia, ANIDIS XIX & ASSISi XVII - 2022

Dimensione del carattere:  Piccola  Media  Grande

An innovative framework for risk assessment of the secondary elements of industrial plants

Gianluca Quinci, Fabrizio Paolacci, Michalis Fragiadakis

Ultima modifica: 2022-08-27


Na-Tech events (Natural Hazard Triggering Technological Disasters) are industrial accidents caused by natural events such as hurricanes, floods, earthquakes, tsunami, etc. In the recent decades, various analytical approaches for the performance-based earthquake engineering (PBEE) have been developed. The most well-known approach is provided by the Pacific Earthquake Engineering Research (PEER) Center, which consists of four stages: hazard analysis, demand analysis, damage analysis, and risk assessment. The accuracy of this method in case of complex critical infrastructure, such as nuclear and non-nuclear industrial plants, is still under investigation. Specifically, for this type of structures it is necessary to define more severe limit states and proper Engineering Demand Parameters (EDP), especially in presence of critical Non-Structural Components (NSC), whose damage can cause serious consequences. Furthermore, because of the narrow distribution of frequencies in the demand of NSC, the selection of ground motion records for fragility analysis represents a critical aspect.

Consequently, the aim of the proposed study is to investigate the suitability of the PBEE approach in presence of  NSCs and their dynamic interaction with the primary structure. On these premises, a comprehensive shake table test campaign was carried out with the aim to investigate the seismic behaviour of two structural configurations of a representative industrial multi-storey frame equipped with process NSCs. In this study the main limit states for NCSs are identified and the related fragility curves built, in a PBEE perspective, both based on the experimental results and finite element model (FEM) simulations. For this purpose an innovative algorithm for ground  accelerogram selection is used. Finally, the mean annual frequency (MAF) of exceedance of the experimentally identified limit states for both relevant NSCs and global structure are carried out.

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