Small projections attached to, or built into, heavy components. The lugs have an opening in the center to which cables can be attached for lifting. Lifting lugs are in the construction of storage tanks and multi-grade dispensers.
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Composite columns are a combination of two traditional structural forms: structural steel and structural concrete. As composite columns were generally developed after steel columns and reinforced concrete columns, their design approach could have been based on either steel or concrete design methods.