Conceptual design of a building with columns and shear walls

Ans 1:-

Aim:- To compare the three alternative plans taking into account the floor shrinkage,lateral stiffness and torsional one with respect to the vertical axis ,the vertical reinforcement.

Soln:-A structure is more restrained it will be more expanding,shrinking and cracking.

There will be more floor shrinkage and expanding in structure A whereas there will be minimum cracks in structure B and C.

The shear walls in the structure also decide wether the floor vibration is more or less in the structure it will be better placing a column at the corners so that it it will reduce the cracks instead of having shear walls at the corners in the structure,

The torsion in the structure C is more as compared to B and C because in the structure C there will be an eccentricity.

The redundancy in the structure A and B in more when compared to structure C because there will be eccentricity in the structure C in the left side where the length of the wall 10 meters which can not carry the load in the either directions.

For lateral stiffness Structure C is more laterally stiff as compared to the Structure A and B because there will be eccentricity in the structure C in the left side where the length of the wall 10 metersa which can not carry the load equally in either directions.

Ans 2 :

Aim:- To discuss the suitability for earthquake resistance of the moment resisting frames

There is two way eccentricity in the structure in the X and Y directions. The eccentricity in the X direction is more when compared to the eccentricity in the Y direction.

There is only two continuous frames in the structure that is B1 and B2 in the X direction and B9,B10 and B11,B12 in the Y direction and all the other Beams are broken midway in the frame.

There will be torsional flexibility in the structure, to avoid torsional restraint it is better to make the room dimensions even in both the X and Y directions and placing the columns at the junction of two wall if it is feasible its better to provide shear wall at appropriaye location

The fundamental translation mode of vibration is larger than the fundamental torsional mode of vibration.

Ans 3:

Aim:-To make proposal for the choice of lateral load resisting system

The above plan that is given is totally unsuitable for normal areas as well as for the earthquake prone areas.

In the sesmic region the lateral loads and the vertical loads plays an important criteria because it helps in resisting the failure against the earthquake as the loads restraint will no coincide with the centre of mass of the structure it becomes eccentric and not suitable for any type of areas.

In this plan a flat slab is more appropriate than a regular beam column junction as it provides support to the columns without any provision of the beam which reduces the weight of the building and also helps in the ductility which indirectly helps to maintain the structure in the earth quake prone areas.

Apart from the flat slab a wooden structure is also appropriate which reduces the weight of the building and also helps to maintain the structure in the earthquake prone areas.