Steel storage pallet racks are structures composed of cold-formed members designed to store goods and wares. They are used in logistic areas, allowing to save space and preserve material. Despite a worldwide usage, their dynamic behaviour is not well known, and the current literature lacks important works about the seismic vulnerability of these systems. In fact, during recent seismic events in Northern Italy, May 2012, many racks collapsed, compromising the goods stored and consequently causing huge economic losses and logistic issues. The aim of this research has been to investigate the seismic behaviour of steel storage pallet racks, in terms of seismic fragility curves. The latter have been retrieved by means of multiple-stripe analysis (MSA), having the potential of using different suites of ground motion records at different levels (i.e., the stripes) of a chosen seismic intensity measure (IM), based on disaggregation of seismic hazard at the site of interest. For the record selection, the Generalized Conditional Intensity Measure (GCIM) approach has been employed, which allows to efficiently select records that match a theoretical target conditional distribution of IMs. A typical rack configuration has been analysed, and epistemic uncertainty related to the construction details has been accounted for by considering different hysteretic connection behaviours and upright moment resistances. Nonlinear dynamic analyses have been performed in the down-aisle direction, considering both geometric nonlinearities via corotational formulation and material nonlinearities via concentrated plasticity in connections. The results have been obtained with reference to different engineering demand parameters (EDPs) and limit states, and the components that are most prone to seismically induced failure have been identified. The obtained fragility functions, if combined with relevant hazard curves, would allow the analyst to carry out a seismic risk assessment and mitigation of steel storage racks.
Seismic Fragility Curves of Steel Storage Pallet Racks / Gabbianelli, Giammaria; Cavalieri, Francesco; Nascimbene, Roberto. - (2019). (Intervento presentato al convegno Fourth International Workshop on Seismic Performance of Non-Structural Elements - SPONSE tenutosi a Pavia, Italia).
Seismic Fragility Curves of Steel Storage Pallet Racks
Francesco Cavalieri;
2019
Abstract
Steel storage pallet racks are structures composed of cold-formed members designed to store goods and wares. They are used in logistic areas, allowing to save space and preserve material. Despite a worldwide usage, their dynamic behaviour is not well known, and the current literature lacks important works about the seismic vulnerability of these systems. In fact, during recent seismic events in Northern Italy, May 2012, many racks collapsed, compromising the goods stored and consequently causing huge economic losses and logistic issues. The aim of this research has been to investigate the seismic behaviour of steel storage pallet racks, in terms of seismic fragility curves. The latter have been retrieved by means of multiple-stripe analysis (MSA), having the potential of using different suites of ground motion records at different levels (i.e., the stripes) of a chosen seismic intensity measure (IM), based on disaggregation of seismic hazard at the site of interest. For the record selection, the Generalized Conditional Intensity Measure (GCIM) approach has been employed, which allows to efficiently select records that match a theoretical target conditional distribution of IMs. A typical rack configuration has been analysed, and epistemic uncertainty related to the construction details has been accounted for by considering different hysteretic connection behaviours and upright moment resistances. Nonlinear dynamic analyses have been performed in the down-aisle direction, considering both geometric nonlinearities via corotational formulation and material nonlinearities via concentrated plasticity in connections. The results have been obtained with reference to different engineering demand parameters (EDPs) and limit states, and the components that are most prone to seismically induced failure have been identified. The obtained fragility functions, if combined with relevant hazard curves, would allow the analyst to carry out a seismic risk assessment and mitigation of steel storage racks.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.