In addition to being an accurate means for structural
comparison, Section Modulus is a well defined number
that can be easily verified. Since Section Modulus is a shape
property only, it can be verified by anyone at any time using
a simple analysis of a published CAD drawing describing
the cross-sectional shape of the sheet piling product in
question.
In conclusion, Section Modulus has been used as the
primary means of design and comparison for structural
capacity of sheet piling products of like materials for
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decades by organizations such as The US Army Corps of
Engineers. Section Modulus has been the comparison tool of
choice because it is the only way to eliminate the possibility
of misleading information through varying factors of safety,
and can be easily verified, therefore giving the choice of level
of safety for any given project to the designer rather than a
material supplier. Moment based calculations can be biased
by representing more subjective factors than true structural
performance. The only way to provide a true performance
based project specification is to specify vinyl sheet piling
based on Section Modulus only.
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