APPENDIX "C" - PROGRAM3,0 - EFFECTS ON STRUCTURES The structures program was sponsored jointly by the Army, Navy and ALr Poree. In addition, the Federal Civil Defense Administration sponsored a test to determine the effect of blast on windows, The program comprised a total of twenty~seven test - buildings and shelters erected at various distances from the "EASY" shot ground zero on three separate islands, The structures were designed in late 1949 on the basis of the best available information on blast loading and structural response, Use was mad: of experimental data from shock tubes, and laboratory tests of materials and elements under dynamic loading. A medium degree of damage between superficial and collapse was desired for test purposes, The structures were So Jocated as to sustain median damage, based on energy yleld predictions and pressure distance data furnished by ‘the Commander, Task Group 3,1. 2. ARMY TRSTS The Army sponsored a three~story building having several independent sec~ tions of different types cf construction, and a composite shelter of three sections; cubicular reenrorced concrete, cylindrical reonforced concrete and cylindrical cor~ rugated steel, Damage to the three-story building was slight, but it was sufficient to furnish @ basis for checking design criteria and methods, The shelter sections were undamaged and provided adequate protection against blast and nuclear radiation effects, 3e NAVY TESTS The Navy had twelve test structures , generally about 20 by 40 fect in plan, of a type that would be employed for magazines, storage, and personnel shelters, Pre~ cast construction was employed in most of the buildings because of its adaptability to overseas use and its relative cheapne 88. Two of the structures were of heavy re- aiferced concrote construction and were inten ded to test the feasibility of providing» protection at a distance of only 83 yards from ground zero, Damago to most of the Navy structures 2 however, : CS was S Severe; ae : . . much useful information was obtained on the comparative value of various types of building s, Detailed data on the mode of failure of structural elements were also obtained , 4. ATR FORCE TESTS Buildings sponsored by the Air Porce were typical of those which mircht be attacked, There was no specific desi gn to resist blast but rather a sele ction of ~l. Doty we reg 1 elite week aghes hid wee mak Vike a“ Poo 7