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INSPECTION - Fork Lift Truck Damage to
I. Purpose of
At the request of the Client, we
performed an inspection and structural
investigation of multiple damaged columns
throughout the 2nd floor region of the
ABC building. The purpose is to determine
what amount of deformation is safely
permissible, and what repair or
reinforcing measures are required where
excessive. Our information is that the
cause of damage was due to impact by
trucks. The inspected damage was
consistent with this type of impact. The
took place 11/24/02.
II. Description of Building:
The building is a two storey steel framed
structure approximately 150' wide by
175' long. The columns in question bear
upon the first storey columns, and
roof trusses and roof beams above.
Analysis shows that the service load
stress in a normal undamaged column is
approximately 12.8 ksi. This stress
corresponds to 88% of the allowable load
column overall. Damaged portions just
above floor level can be considered to
a higher allowable stress since they
occur near the brace point created by the
diaphragm. At floor level, the 12.8 ksi
corresponds to 61% of allowable load.
A reasonable value for the first 18
inches above the floor would be about
leaves room for a small amount of damage.
Calculations show that if a flange has a
kink, the service load stress in the
flange roughly doubles. Since most of the
columns have flanges pushed out of plane
an inch or more, some sort of repair is
required for them.
Attempts at heating and straightening the
columns can be attempted, but there is
significant restriction on this due to
the danger of applying too much heat into
columns in place and under load. No heat
should be applied while any significant
snow or other roof load exists.
Steel reinforcing plates can be welded
into place in various configurations to
strength lost by the deformations. This
may not be practical or adequate at some
the columns with extensive deformation.
Excessive heat during the welding process
must be considered, and accounted for in
any repair design.
The first 3 to 4 feet of the column can
be encased in concrete. Some
and/or reinforcing prior to installing
concrete may be necessary at some
The concrete will need to have
appropriate reinforcing in order to
restrain the deformed flanges.
- 1200 Troon
- Grand Rapids, MI
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2012 Structural Solutions LLC, 1200 Troon Ct. SE
Grand Rapids, MI 49546 Kent County