Structural Analysis
The deflection at any point of a perfect frame can be obtained by applying a unit load at the joint in

The direction in which the deflection is required
Inclined direction
Horizontal direction
Vertical direction

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

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

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

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