Steel and Composite Structures

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Load-level isolator model for pallets on industrial storage racks and validation with experimental results

  • Marcelo Sanhueza-Cartes (Facultad de Ingenieria, Universidad Catolica de la Santisima Concepcion) ;
  • Nelson Maureira-Carsalade (Facultad de Ingenieria, Universidad Catolica de la Santisima Concepcion) ;
  • Eduardo Nunez (Facultad de Ingenieria, Universidad Catolica de la Santisima Concepcion) ;
  • Angel Roco-Videla (Universidad Arturo Prat)
  • Received : 2023.08.29
  • Accepted : 2024.06.20
  • Published : 2024.07.10
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Abstract

This paper introduces a system allows for seismic isolation of the pallet from the rack in the down-aisle direction, occupies minimal vertical space (5 cm) and ±7.5 cm of deformation range. A conceptual model of the isolation system is presented, leading to a constitutive equation governing its behavior. A first experimental campaign studying the response of the isolation system's components was conducted to calibrate the parameters of its constitutive equation. A second experimental campaign evaluated the response of the isolation system with mass placed on it, subjected to cyclic loading. The results of this second campaign were compared with the numerical predictions using the pre-calibrated constitutive equation, allowing a double-blind validation of the constitutive equation of the isolation system. Finally, a numerical evaluation of the isolation system subjected to a synthetic earthquake of one component. This evaluation allowed verifying attributes of the proposed isolation system, such as its self-centering capacity and its effectiveness in reducing the absolute acceleration of the isolated mass and the shear load transmitted to the supporting beams of the rack.

Keywords

Acknowledgement

The authors thank the manager of the company "LEMUSSE Desarrollo e Ingenieria SpA", engineer Christian Leva, for his constructive comments suggested from a commercial point of view and industrial use of technology that allowed to improve this research work. The authors are also grateful to the DI-FMEI 06/2023 fund, granted by the Research Directorate of the Universidad Catolica de la Santisima Concepcion, Concepcion, Chile.

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