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Structural Characteristics:
Hangar Building 340 is a conventionally reinforced cast-in-place
concrete structure that was constructed by the Navy in 1940, for
use by large seaplanes.
The structure consists of a double arch type of construction having
overall dimensions of 250 feet by 600 feet with a maximum height
of 80 feet at the crown of the arches. Clear span of arches is almost
300 feet.
The load carrying system consists of thin shell concrete roof slab
supported by reinforced concrete arches. The thin shell concrete
roof has a thickness of 4-6 inches. The concrete arches have a depth
of 6 feet at their crown and 14 feet at their base, with widths
varying from 2 to 7 feet. Both the thin shell concrete roof slabs
and the concrete arches are heavily reinforced with both plain and
deformed reinforcing bars.
Due to the uniqueness of the framing system coupled with its massive
size and very long clear span of almost 300 feet, Hangar Building
340 is recognized by the American Society of Civil Engineers as
a Historic Building.
At the present time, this hangar is utilized by the Navy for housing
four squadrons of helicopter craft, with a total staff of about
1,000 Navy personnel assigned to this maintenance hangar that is
considered an essential facility.
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