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___________________?

A. the head of the load reaches the section
B. the tail of the load reaches the section
C. the load position should be such that the section divides it equally on both sides
D. the load position should be such that the section divides the load in the same ratio as it divides the
✅ The correct answer is option D.

To generate the j the column of the flexibility matrix________________?

A. a unit force is applied at coordinate j and the displacements are calculated at all coordinates
B. a unit displacement is applied at co-ordinate j and the forces are calculated at all coordinates
C. a unit force is applied at coordinate j and the forces are calculated at all coordinates
D. a unit displacement is applied at co-ordinate j and the displacements are calculated at all co-ordinates
✅ The correct answer is option A.