Conceptual design of a building with columns and shear walls

Q1

1) Restrain of floor shrinkage- It will be worst in 'c' case and best in 'a' case due to placement of shear walls at corner, 'b' case will also be good but not in comparision with 'a'

2) Lateral stiffness- Worst in 'c' case best in 'a' case, 'b' case wont be having better because walls on corners are not able to provide that much stiffness

3) Torsion- worst in case 'c' and best in 'a' and average on 'b'

4) Reinforcement required for same load- Max will be required in case 'c',then on 'a' and then 'b'

5) Static eccentricty- most eccentric will be 'c' case

6) redundancy- under same load 'c' case will be under much more stresses so, 'a' and 'b' are more redundant.

7) Foundation system- 'a' case will require a box type foundation because of its L shape, 'b' case will require strip foundation and 'c' case will require much heavier foundation.

8) Architectural constraint- No architect will allow the 'c' case, 'a' is most suitable from this point of view.

Q2

Things need to be modified in this plan are

-B7 beam which is a secondary beam should be shift on right and end on column C6

-As proper grid is not followed, B3 should also be shifted to C5 column and beam B5 B6 should be made to be in line

-Sizes of beam and column shown will tend to promote the strong beam and weak coloumn.

Q3

-As portion of the area is much greater in left side so the length of shear wall must be more in left side of the plan

-Shear wall must be designed to take all lateral load and column should take only gravity load seeing the irregularity in plan and irregularity in all the floor with respect to arrangment of the beams and wall

-Columns should be tied with the shear wall the foundation level