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'a ANL Il.3 »41.1 1-,0 <br />, I <br />B. .DESCRIPnON OF TRUSS STRUCTURES - <br />The aluminum lighting truss 8tructures are constructed of a series of welded aluminum <br />assemblies connected by high strength bolts. The welded aluminum assemblies are <br />constructed of 6061·Te Bluminum welded with ER4043 finer altoy. High strength <br />bolts are 5/8- dia. SAE, Grade 8 (equivalent to ASTM A:354, Gr. BD) borts. The <br />geometry and section properties for the ten (10) aluminurn truss configurations <br />investigated are summarized on the following pages. <br />1