Structural Analysis
The principle of virtual work can be applied to elastic system by considering the virtual work of

None of these
Internal forces only
Internal as well as external forces
External forces only

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

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

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