Abstract
We present here linear and nonlinear finite element analyses of a newly designed deployable rapid assembly shelter (DRASH J) manufactured by DHS Systems. The structural analysis is carried out in three stages. Firstly, single composite tubes (struts) under three-point bending are modeled with five layers of orthotropic materials in three different orientations and the simulation results are compared with the actual test data for validation. Secondly, a comprehensive structural model for the entire shelter is constructed with the consideration of two types of strut scissor points, namely natural and forced scissor (crossing) points, as well as partial-fixed hub joints, which allow rotations along individual hub slots (grooves). Finally, a simplified structural model is created by introducing fixed joints for the scissor points as well as rigid links for the hubs. With sufficient verifications with experiments and different modeling methods, linear and nonlinear finite element analyses are then carried out for both the comprehensive and simplified shelter models. Based on the simulation results, we are able to identify a few critical issues pertaining to proper design and modifications of such shelter systems, such as various end wall supports pertaining to the overall structural stability.
Highlights
Analysis of a Large Shelter withThe deployment of deployable rapid assembly shelters (DRASH) in a field emergency can be accomplished minutes after arrival at the crisis areas for both military and civilian missions
Similar finite element analyses of these types of complex structures have been reported in references. [12,13]. We focus on both the linear elastic response and linearized buckling analysis of the entire structures as well as the nonlinear analyses
We must be aware that the assumptions make the simulation model more stable than the real structure which provide an upper bound for the estimate of the collapse load
Summary
Analysis of a Large Shelter withThe deployment of deployable rapid assembly shelters (DRASH) in a field emergency can be accomplished minutes after arrival at the crisis areas for both military and civilian missions. DHS Systems provides state-of-the-art technology in such portable sheltering. DRASH technology as the smaller XB shelter and is currently one of the largest single unit shelters manufactured by DHS Systems. The J model considered in this analysis measures externally 33.66 L × 34.16 W × 17.97 H ft and provides more than 1100 ft of usable interior floor space. The key frame of the shelter comprises of composite tubing structures with preattached interior and exterior covers. Limited study has been performed for the entire structure stability of the J shelter with respect to snow load. The research presented in this work is important because it provides the first linear and nonlinear structural analysis for the entire J shelter as well as necessary verification comparisons with both experiments and different modeling methods
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