Verification of Dynamic Load Factor for Analysis of Airblast-Loaded Membrane Shelter Panels by Nonlinear Finite Element Calculations
Final rept. Feb-Sep 1990
ARMY NATICK RESEARCH DEVELOPMENT AND ENGINEERING CENTER MA
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A structural concept consisting of thin membrane skin panels supported by stiffening ribs is under study for use in tactical shelters designed to withstand airblast. For design analysis it is desirable to evaluate membranes under static loadings in place of more complex and costly dynamic analysis. Previous analysis indicated that membrane panel deflections produced by the dynamic airblast loading would be approximately equal to those produced by a static pressure loading four times as great. This result is confirmed in work reported here using a nonlinear finite element code to determine the static and dynamic response of rectangular and infinitely long membranes. The use of static loads of four times the peak airblast-reflected overpressure loading should be sufficient for design purposes in consideration of head-on blast encounters with the membrane panel.
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