Posted Apr 28, 2013, 1:49 AM
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Mortaaaaaaaaar!
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Join Date: Aug 2007
Location: Naugatuck, CT/Worcester,MA
Posts: 3,506
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The thing is, these old truss bridges are very maintenance intensive. Although the trusses have very efficient use of material, they have so much surface area that requires painting and are vulnerable to rust. Not to mention the current trend in civil engineering (spurred by the I65W collapse) to remove truss bridges that don't have redundant load paths.
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