000013174 001__ 13174
000013174 005__ 20161114160330.0
000013174 04107 $$aeng
000013174 046__ $$k2009-06-22
000013174 100__ $$aDegee, H.
000013174 24500 $$aDynamic interaction between merchandizes and supporting structure in steel storage racking system

000013174 24630 $$n2.$$pComputational Methods in Structural Dynamics and Earhquake Engineering
000013174 260__ $$bNational Technical University of Athens, 2009
000013174 506__ $$arestricted
000013174 520__ $$2eng$$aWhen static steel storage racks are subjected to seismic action, a specific limit state must be considered additionally to classical resistance and stability criteria, i.e. the fall of pallets with subsequent damage to goods, to people and to the structure itself. From an analysis point of view, this requires to account both for the sliding motion of the pallets with respect to the supporting beams and, if relevant, for the rocking motion of the stored goods. Further, since the mass of the merchandizes is usually very important compared to the mass of the structure itself, their sliding and rocking motion introduces a strong dynamic interaction between the stored objects and the supporting structure. The objective of the present contribution is to investigate this coupled behavior and to study its consequences on the structural safety in the perspective of deriving design recommendations. To this purpose, a parameter study is performed with a specifically developed numerical tool. Regarding the sliding behavior, it can easily be stressed that if the amplitude of the relative motion is not too important, in such a way that pallets can remain on the rack, the sliding effect can benefit to the structure since it is limiting the horizontal seismic forces transferred to the rack to a maximum intensity equal to the friction force at the interface between pallet and beam. In this contribution, it is evidenced that a reduction factor can thus be applied on the seismic load and that this reduction is depending on the structural typology (and in particular on the first natural frequency of the system) and on the ratio ag/μ between the design acceleration of a structure with the additional masses supposed to be fixed and the friction coefficient of the pallets.

000013174 540__ $$aText je chráněný podle autorského zákona č. 121/2000 Sb.
000013174 653__ $$aSteel storage racks, pallet sliding. Abstract. When static steel storage racks are subjected to seismic action, a specific limit state must be considered additionally to classical resistance and stability criteria, i.e. the fall of pallets with subsequent damage to goods, to people and to the structure itself. From an analysis point of view, this requires to account both for the sliding motion of the pallets with respect to the supporting beams and, if relevant, for the rocking motion of the stored goods. Further, since the mass of the merchandizes is usually very important compared to the mass of the structure itself, their sliding and rocking motion introduces a strong dynamic interaction between the stored objects and the supporting structure. The objective of the present contribution is to investigate this coupled behavior and to study its consequences on the structural safety in the perspective of deriving design recommendations. To this purpose, a parameter study is performed with a specifically developed numerical tool. Regarding the sliding behavior, it can easily be stressed that if the amplitude of the relative motion is not too important, in such a way that pallets can remain on the rack, the sliding effect can benefit to the structure since it is limiting the horizontal seismic forces transferred to the rack to a maximum intensity equal to the friction force at the interface between pallet and beam. In this contribution, it is evidenced that a reduction factor can thus be applied on the seismic load and that this reduction is depending on the structural typology (and in particular on the first natural frequency of the system) and on the ratio ag/μ between the design acceleration of a structure with the additional masses supposed to be fixed and the friction coefficient of the pallets.

000013174 7112_ $$aCOMPDYN 2009 - 2nd International Thematic Conference$$cIsland of Rhodes (GR)$$d2009-06-22 / 2009-06-24$$gCOMPDYN2009
000013174 720__ $$aDegee, H.$$iDenoel, V.
000013174 8560_ $$ffischerc@itam.cas.cz
000013174 8564_ $$s273095$$uhttps://invenio.itam.cas.cz/record/13174/files/CD230.pdf$$yOriginal version of the author's contribution as presented on CD, section: Seismic safety assessment of structures - ii (MS).
000013174 962__ $$r13074
000013174 980__ $$aPAPER