Structural Analysis
The maximum bending moment due to a train of wheel loads on a simply supported girder

None of these
Never occurs under a wheel load
Always occurs at centre of span
Always occurs under a wheel load

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

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Structural Analysis
To generate the j th column of the flexibility matrix

a unit displacement is applied at co-ordinate j and the forces are calculated at all coordinates
a unit force is applied at coordinate j and the forces are calculated at all coordinates
a unit displacement is applied at co-ordinate j and the displacements are calculated at all co-ordinates
a unit force is applied at coordinate j and the displacements are calculated at all coordinates

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Structural Analysis
When a series of wheel loads crosses a simply supported girder, the maximum bending moment under any given wheel load occurs when

None of these
The centre of span is midway between the centre of gravity of the load system and the wheel load under consideration
The centre of gravity of the load system is midway between the centre of span and wheel load under consi-deration
The wheel load under consideration is midway between the centre of span and the centre of gravity of the load system

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