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Methods
Inspection/Evaluation Methods:
As a result of the spalling that occurred and the evacuation of
the two hangar bays, the structural engineers were engaged to both
evaluate the overall structural integrity of Hangar Building 340
and then provide repair methods that could be quickly performed.
A thorough structural analysis was made using a 3-dimensional
computer program known as SAP 2000. This analysis indicated that
the basic design for this hangar was quite adequate to resist gravity
and wind loads.
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An extensive inspection program
was then made to determine the extent of the corrosion of
the reinforcing steel on the underside of the roof shell and
the exterior arches. The primary inspection method for this
evaluation was provided by a large number of "soundings"
made by the impact of a hammer on the concrete. The results
of the soundings determined that the corrosion of the reinforcing
steel had spalled/laminated the concrete in a large number
of locations, especially on the exterior outer portion of
the arches. |
In addition to this inspection methodology, a testing procedure
was established to determine:
| · |
Compressive strength of concrete obtained
by taking cores. |
| · |
Thickness of the thin shell concrete
slabs determined by roto hammer penetrations. |
| · |
Ultrasonic testing to determine concrete
compressive strenght. |
| · |
Half-cell potential measured to determine
corrosion activity of the reinforcing steel. |
| · |
Quality of concrete, depth of carbonation
and chloride content obtained by cores examined by a
testing company in Skokie, Illinois. |
Finally, portions of the concrete that were spalled were removed
at a number of locations to determine the extent/degree of corrosion
of the underlying reinforcing steel.
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