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

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Structural Analysis
When a uniformly distributed load, shorter than the span of the girder, moves from left to right, then the conditions for maximum bending moment at a section is that

the load position should be such that the section divides it equally on both sides
the head of the load reaches the section
the tail of the load reaches the section
the load position should be such that the section divides the load in the same ratio as it divides the span

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