UFC 4-151-10
10 September 2001
CHAPTER 6
STRENGTH EVALUATION OF EXISTING WATERFRONT STRUCTURES
6-1
EVALUATING STRENGTH OF EXISTING MATERIALS. Recent work by Naval
Facilities Engineering Service Center (NFESC) has accomplished much in evaluating the
strength of existing materials. NFESC has conducted impact load tests, followed by finite
element analysis to evaluate the strength of a number of waterfront locations. This was
followed by development of innovative repair techniques such as installation of a laminate
composite overlay on the underside of existing Navy piers. A series of reports have been
published on this topic that can be accessed at the NFESC website:
hardware, reference UFC 4-150-08 Inspection of Mooring Hardware.
6-1.1
6-1.2
Number of Tests Required to Establish Strengths of Undocumented
Materials. Where no documentation exists pertaining to the strength of an existing
material, the strength must be established by tests of the material. Use the value that
sampling and testing indicates to have a 95 percent probability of being exceeded, as the
strength of material to be assumed for strength evaluation of the structure. Use no fewer
than four samples of a given material for testing.
6-1.3
Tests and Test Specimens
6-1.3.1
Steel Members. For steel members, take test specimens from locations
and as described in ASTM A6, Standard Specifications for General Requirements for
6-1.3.2
Concrete Members. For concrete members, use drilled cores and sawed
beams as described in ASTM C42, Obtaining and Testing Drilled Cores and Sawed
6-1.3.3
Wood Members. For wood members, stress-grade visually as described in
6-2
COMPUTING STRENGTH OF THE STRUCTURE. Base analyses on
measured in-place dimensions and existing conditions. A badly deteriorated or obviously
overloaded structure often continues to support the applied loads with no discernible
indications of distress. It is important to consider the factors contributing to this
phenomenon when evaluating the strength of an existing structure. The more important
of these factors are presented in paragraphs 6-2.1 through 6-2.8.
6-1
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