Conceptual design of a building with columns and shear walls

1.The building shown, 20 × 35 m in plan, has columns on a 5 × 5 m grid and shear walls (with dimensions shown in m, 250 mm in thickness) in three alternative arrangements, (a), (b), (c), all with the same total cross-sectional area of the shear walls. Compare the three alternatives, taking into account the restraint of floor shrinkage, the lateral stiffness and the torsional one with respect to the vertical axis, the vertical reinforcement required for the same total flexural capacity at the base, the static eccentricity, the system’s redundancy, foundation systems, architectural constraints etc.

1. In this plan the shear wall system is safe in option a and b.
2. Insteand of option b is better than because the shear wall in center we can place an any lift portion and others in column can be placed.
3. These lateral load are faced similarly and transver the load in correct node.so floor shrinkage be safed and stiffness of the shearwall wil be same.
4. In the option c one side of wall dimension differ so force can distributed equaly so the shrinkage of the floor and the torsion will applied in slabs it is eccentricity load is act.

2.Discuss the suitability for earthquake resistance of the moment resisting framing plan of a three-storey building depicted here (cross-sectional dimensions in cm), the eccentricity of the centre of mass (as centroid of floor plan) to the centre of stiffness (from the moments of inertia of the columns) are shown. Suggest an alternative. Also, is there torsional flexibility? Are the two fundamental translational modes of vibration larger than the fundamental torsional mode of vibration. Discuss qualitatively.

1. In this plan they have eccentric load on the two direction X and Y direction.
2. The two beam are intresect in the beam it create a torsion on the beam.
3. we can create a column in this place otherwise addtional torsion reinforcment is place for resist the torsion in the beam.
4. There is no torsion flexibilty itgh will added on the beam.

3.A multi-storey building with basement, with a quadrilateral (non symmetrical floor plan) plan as, has interior columns in an irregular (not in a grid) pattern in plan that serves architectural and functional considerations. Partition walls and interior beams supporting the slab have different layout in different stories. However, there is no constraint to the type, location and size of the lateral force resisting components and sub-systems on the perimeter. Proposals are to be made and justified for the choice of the lateral-load-resisting system and its foundation.

1. In this plan the column is irregular formation they didt resist the any stifness of beam
2. The irregular grid the support of beam is not there slab are placed on the column.
3. The interior column can be used in any floor in the plan.