Conventional
approaches relate the load assignment to the storage/retrieval (S/R) travel time, affecting the handling
costs, neglecting any further issue. This paper faces the so-called unit-load assignment problem (ULAP)
for industrial warehouses located in seismic areas presenting an innovative integer linear programming
(ILP) model. The model includes both the S/R travel time and an innovative stability condition for the rack
collapse prevention during seismic events. A case study, based on a multi-scenario analysis, is discussed
to show the benefits coming from the application of the proposed strategy and to assess the impact of the
stability issues on the average single-command travel time. The key results outline the effectiveness of
the proposed strategy revealing that significant improvements in the structure stability are achievable
with little decrease of the S/R efficiency.