Structural Analysis
The minimum horizontal distance between two parallel main reinforcing bars, is

Greatest value of the above
The diameter of the bar if their diameters are same
The diameter of the longer bar if their diameters are unequal
5 mm more than nominal maximum size of the coarse aggregate

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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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