Structural Analysis
The thickness of the rectangular plate for the cap or base of a solid round steel columns, is calculated from the formula t = √[(9W/16 fbct) × D/(D -d)] where ‘d’ is

The diameter of the top
The diameter of the base
The reduced diameter of the column
The dimension of the base

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Structural Analysis
Pick up the incorrect statement from the following:

The gross section of the web of plate girders is the depth of the web plate multiplied by its thickness
The gross section of the web of channels is the depth of the web multiplied by its thickness
None of these
The gross section of the web of rolled I-beams is the depth of the beam multiplied by the web thickness

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