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ABSTRACT
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3 The purpose af this study,“Damage-Gervey-and-Anatveig-of Structures 2-48, to determine
the damage and blast loading on Operation Greenhouse Acmy Test Structure 3.1.1 and to survey
the damage done to Creenhouse Structure 3.1.3 and other miscellaneous structures. These
structures, located on the Zniwetck Atoll, were expcsed to the effects of the two atomic bursts
(Mike ard King) of Operation Ivy in the late fall of 1962, A damage survey was conducted by
theOffireoftheChiel
uf Souineers-andthe-Messachusetts inetrtute of Technology tn Auerst4943 to obtain data cyon which to base a correlation of the damage incurred with the measured
air-blast ovorpressures caused by the two shots,
The damage caused ': Structure 3.1.1 by shot Mike was comparabte to that caused by shot
Easy of Operation Greenlouse. It is probable that no damage occurred to Structure 2,1.1 from
shot King. Owy the fiz! permanent deflections were recorded of Str. cture 3.1.1 for shot Mike.
The jack of transient response records for this shot Increased the dituculty of correlating the
loading with the deformations sustained.
Analyses were periormed on Buildings 2 and 3 of Structure 3.1.1. The effect of va.“ying
overpressure gnd the snare of the load-time curve were investigatedPee-structaral paramaers of Buildings 2 and 3 were obtained-by correlation of the measured overpressure with the
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+ recordetrrespones ier ehot Kasy of Operation Greenhouse. The results'of the various analyses
for Operation Ivy :ndscate thal the free-air overpressure in the vicinity of Structure 3.1.1 was
between 12 and i4 ps: for shot shke. which compares reasonably weil + “th pressures pre-
dicted at Structure 3.1.1 based on actual measurements made ut uther Ications rear the
8 tructure.
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ews The oldervatirrs «ade in the gross-damage survey may ve cummarized as follows:
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1, The di mk? sustained by tha var‘ous buildings of Structure 3.1.1 oce to shot Mike was
ba es,
as follows: The test paacis of hwilaregs t and 7 sustained oniy slight c2ditional damage due to
air biast, The steei rrames of Building 2 «fe +3 moderate plastic defo: mation, and the steel
sheeting af the rear foce was disturted inward between pitts. The site, frame and acding of
formed their function satisfactarily without exhibiting any primary structural failures,
4. Of the many cone stary reinforced-concrete surface and semiburied structures ob-
served, none were badly damaged. The only serious structural failures observed were confined
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to wing walis designed to retain portions of the f:ll on the semiburied structures. Exposed
seAhd
blast. The painted surface of the vent pipe was charred on the side facing Ground Zeru ‘+.
gage overpressure was approximately 18 psi.
3. Ali re:nforced-concrete semiburiea instrumentation suelters appeared to have per-
deine iohs.oh tact ig.
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Builaing 6 received no apparent addsticnal camage. The .oncrese frames of Puridings 3 and >
suffered moderate riastic deformation, The rear wall of Building 5 was blow; ou oy the air
blast. The scar wells of Building 4 were undamaged. However, large cracks were cpened in
the roof slabs udiccent to the shear walla and roof girdera. The overpressure was approxi.
mately 14 psi.
2. Structure 3.1.3 suffered no major structural damage. The biast dr ors were removed
pricr to the test. The wood-frame air lock, which was left in place, wa:. destroyed by the air