Structural Analysis
The three moments equation is applicable only when

The beam is prismatic
There is no settlement of supports
There is no discontinuity such as hinges within the span
The spans are equal

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Structural Analysis
Pick up the correct statement for the web stiffeners.

For horizontal stiffeners, d is the clear distance between the horizontal stiffener and the tension flange
d is the distance between flange angles or the clear distance between flanges
All of these
Vertical stiffeners are spaced at a distance not greater than 1.5 d and not less than 0.33 d

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