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· The material type may influence the
type of shapes that can be fabricated.
·
For the wood, shown at the top of the diagram, stronger beams
are fabricated from larger cross-sections. The aspect ratio (h/b) can be changed
to improve deflection response for a beam loaded in the "h" direction
and 2 x 4, 2 x 6, and 2 x 10, sections are common for house construction
and rely on this change of depth to permit larger loads to be carried.
· The steel sections shown
in the lower part of the diagram take advantage of the same geometrical behavior,
the deeper section having a larger resistance to bending than the smaller
section. The rolling technique used to form steel into beams permits the more
complicated shape. In this case, the material section thickness, t, is important
as well as the overall aspect ratio.
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