Concept on positioning of Columns
Ans1. Investigation of the framing plan with respect to symmetry in X- direction.
If we split the plan vertically half it willlook mirrored . So we concluded the given plan is symmetric in X- direction.
. Investigation of the framing plan with respect to symmetry in Y- direction
If we split the plan horizontally half, it will look mirrored again.
So we conclude the given plan is symatric in Y- direction
Contd.,
Investigation of the framming plan with respect to redundancy in X- direction.
Reduncy is nothing but the behaviour or the structural arrangement of a building which has sufficant number of supports that are arrange in an order
The column in X- direction are compratively more and evenly spaced.
So the structural is more redundent in X -direction . Except the top and bottom column rows are having quite longer spans.
.Investigation of the farming plan with respect to redundency in Y-direction
The column in Y- direction are comparatively lesser but evenly spaced .
So the structure is redundant but lesser then that of in X- direction.
Contd.,
Investigation with respect to Bi-directional stiffness:
.The column in horizontal direction are connected with straight to straight beams. This means , any lateral load (Seismic force in X- direction) passing from left end of the building will have it's path straight till it reaches right end of the building . So no or less possibility of force diversion take place.
. The column in virtical direction are not connected with straight to straight beam. so a lateral load passing from south side of building will get diverted to east & west direction to reach next bay. There will be major force diversion take place with sesmic force in Y-direction . The framing plan is week with respect to bi-directional stiffness in Y-direction.
Contd.,
Investigation if the framing plan with respect to ductility:
. Prima facie, the aspect ratio of the plan clearly hints more column in X-direction compared to y-direction. It will result in higher stiffness of the building in X-direction, which would reduce ductility in X-axis.
. Moreover , the x-force will easily pass one bay to its next due to beam alignment. Whereas , the y-force will struggle to pass through. The north-south beam are arrange in zig-zag which leads to a discontinuous bracing.
.We can conclude that the given framing plan is more ductile in y-direction than that of x-direction.
Ans2.
.Vertical irregularity- The building plan area is large in bottom stories. The floor plan areas are getting reduced with increase in height. These building offset has to be crosschecked with reference to IS-1893-2016 Table-6 serial number (iii)
.Soft story- The building has uncovered opening space in `6^(th)` floor . As there is no occupancy or a partition wall, this will lead to plastic hinge formation at the columns (with reference to IS-1893-2016 Figure 4A). This has to be checked and sufficiently designed. 
. Slopy base- They building is constructed on a sloping ground at one side. This will lead to significant variations in the stiffness (with reference to IS-1893-2016 Figure 5E). FEw levels may be subjected to soft storey mechnism.
Ans3.
.Open ground floor- This denotes soft storey mechanism acting in the building
. Rooms along 2 bays separated by an open corridor- The bays filled with rooms will have higher mass compared to the middle bay left open for corridor. This induces mass irreguarity along height uniformly.
. Two short sides covered with infill walls- This means the building's left and right sides periphery is more stiffer during seismic forces (especially alomg North-South)
. Staircase portion at left top corner- Usually staircase and lift portions are stiffer than other parts because of concentrated concrete elements. So the staircase portion contains more stiffness in the provided building plan.
Comtd.,
. No framing connection along Y-direction- We could see structural beams provided along the vertical direction between columns. This makes the building more vulnerable during the North-South seismic force.
. Beams connected along column minor axes- The columns are having longer dimension in Y-direction. This means they are more stiffer along y-direction . But the beam are running only along x-direction which would attract moch lesser leteral forces and hardly transfer it.
. Variation in column sizes- The internal columns are having higher size compared to exterior columns (This is common because of higher load demands). So the concrete floor might have suffered heavy out-of-plane shear which would lwd to collapse.