Analysis of an Expeditionary Structure


  1. Ozum, A.
Corporate Authors
Defence R&D Canada - Suffield, Ralston ALTA (CAN)
The Canadian Forces designed a steel-framed HESCO/ISO bunker for collective protection. To validate the design a 3-dimensional model of the bunker was analyzed with STAAD (a commercial structural analysis program) under a dynamic impulsive overpressure loading. The structure consists of an ISO shipping container surrounded by a steel frame and perimeter HESCO bastion walls. There is a steel roof supporting smaller HESCO bastions and an observation post on the roof. The objective of the analysis is to determine the maximum loading that the structure should be able to repeatedly withstand. Based on the analysis of the structure using STAAD and assuming that the dynamic impulse may originate from anywhere, it is the performance of the HESCO walls that limits the elastic load rating for the structure to a maximum reflected overpressure of 420 kPa with a time of duration of 0.004 seconds. This corresponds to a peak side-on pressure of roughly 80 kPa with a time of duration of 0.004 seconds or an impulse of 0.32 kNs/m2. The observation post is a weak link in the design and might fail at a lower load than the rest of the structure. Recommendations for future improvements include: modifying the entrances to put increased gravity loads on the narrow end walls; saturating the HESCO bastions with a very lean mix concrete fill to decrease the loss of fill, and extend the life of the HESCOs; and having the entrances face opposite directions.
Report Number
DRDC-SUFFIELD-CR-2005-033 — Contractor Report (Final)
Date of publication
01 Mar 2004
Number of Pages

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