Structural Analysis
The minimum horizontal distance between two parallel main reinforcing bars, is

Greatest value of the above
5 mm more than nominal maximum size of the coarse aggregate
The diameter of the bar if their diameters are same
The diameter of the longer bar if their diameters are unequal

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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 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
the head of the load reaches the section

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