Development of a Single-Degree-of-Freedom (SDOF) Model for an Aluminum Arch Subjected to Impulse Loads
Interim rept. 3 Sep 2002-30 Jun 2007
ALABAMA UNIV IN BIRMINGHAM
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This document was prepared to report the results of analysis performed to develop a static resistance definition for an aluminum arch similar to that used in soft-walled shelter frames. The static resistance curve was developed using a NAsa STRuctural ANalysis NASTRAN Finite Element Model of a single bay of the shelter system. Pressure loads were input to the model as a distributed load over the surface of the structure facing the impulse load within a nonlinear static NASTRAN analysis. The displacement resulting from the analysis was then used to develop the static resistance function. The resulting resistance function was then used in a single-degree-of-freedom SDOF model to predict the displacement of the system when subjected to impulse loads. This displacement was then compared to empirical results obtained from full-scale testing. In addition to the test impulse conditions, additional cases that simulate various charge sizes and standoff distances were input into the SDOF model. These conditions were chosen to simulate points on the pressure-impulse diagram that showed minor damage to the structure and failure of the structure when using the pressure-impulse diagram developed for the shelter through the test program.
- Structural Engineering and Building Technology