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722.2.4.2 Minimum Cover for R/C Columns
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The minimum thickness of concrete cover to the main longitudinal reinforcement in columns, regardless of the type of aggregate used in the concrete and the specified compressive strength of concrete, f 'c, shall not be less than 1 inch (25 mm) times the number of hours of required fire resistance or 2 inches (51 mm), whichever is less.
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722.2.4.2 Fire and Smoke Protection Features, Minimum Cover for R/C Columns
The minimum thickness of concrete cover to the main longitudinal reinforcement in columns, regardless of the type of aggregate used in the concrete ...
DC Building Code 2017 > 7 Fire and Smoke Protection Features > 722 Calculated Fire Resistance > 722.2 Concrete Assemblies > 722.2.4 Concrete Columns > 722.2.4.2 Minimum Cover for R/C Columns
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DC Building Code 2017 > 7 Fire and Smoke Protection Features > 722 Calculated Fire Resistance > 722.5 Steel Assemblies > 722.5.1 Structural Steel Columns