t
A group was formed at Sandia Corporation comprising corporation cmployces, onlisted
personnel from the Army, Navy and Air Force, and college students, te obtain these
Technical evaluation and procuroment or existing equipment was accom~
measurements,
In some cases equipment had to be developed or existing equip-
plished effectively.
Installation and operation of the instrumentation equipment by the
ment adapted,
Sandia Group provided useful data from morc than 95% of the measurements planned,
b.
Large dependence was placed on the measurement of transient effects in-
Blast pressures on the buildings, both
volving a total of 1,065 gauge recordings,
inside and outside, and comprehensive measurements of structural response were inde,
Measure-
Motion picture photography was used to record motions and modes of failure.
ments were made of conditions of the buildings before and after boing subjected to
blast, such as rod and transit surveys, audio velocity measurements in concrete,
micrometer measurements of distances and natural period studics of ten structures,
c.
The Los Alamos Scientific Laboratory accomplished the still photography
and the firm of Edgerton, Germeshausen and Gricr accomplished the motion picture
photography.
These photographic rocords will be of great value in analyzing struct-
ural damage.
&.
CONCLUSIONS
a
The complete analysis of results will reauire several months since it is
nceessary to take all the measured pressurcs and analyze cach structure to determine
whether the deformitions caleuletod by the method cstablished prior to the tests
checks out with the measured deformations.
In the work which has been accomplished
thus far very good agreemont, has becn obtained,
‘The measured pressures, howover, are
quite different in many cases rrom those predicted by theory and shock tube experi-
iments,
It is in this Phe that the gre:test amount of effort is indicated,
b.
The shelter designs of the Corps of Engincers were proven adequate under
heat conditions at a distance of 1700 feet fromtho tower,
This distance was in-
tended to provide the same peak pressure as for a point directly underneath the
bomb at optimum height for a ten pound overpressurc.
SOMG
The conditions ef the test,
particularly the effect of the ground, led to some
uncertainty as to whether the
she
“yo
1
np
id
Shelt
et
ers did
recci
ve the same
press* ure as would have beon experienced dircetly
under~
neath the same bomb,
From a general viewpoint, however, the test results
will bo
very uscful in indicating the order of value
of the sheltor designs,
c.
o
The analysis of models displayed in tho tests
is incomplete,
The use
£ models toa investigate diffraction effe
cts on structures appears promising
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