Concept on positioning of Columns

1.

.

• It is observed that the distribution of mass,stiffness is across the plan has good symmetrical aspects.
• This tends to reduce the horizontal displacements in both of the two horizontal displacements in both of the two Orthogonal Horizontal Directions and has uniformity.
• The building plan may not be able to resist the horizontal seismic actions in the shorter direction (Y-axis) and also the resistance and stiffness in the shorter direction (Y-axis) is less when compared to longer direction (X-axis).

2.

The possible type of irregularities for the given structure are:

Irregularity:

1) Soft storeys

2) Extremely flexible Structure in torsion

Some provisions to avoid the irregulrities:

The columns which are provided on the structure should be of same size and height through out the building.

As we observed the weight of the building from ground floor has increased towards top thats the reason behind collapse.The weight of the building from ground floor should decrease towards top.

The building is torsionally irregular.So the building framing must be revised.

The mass irregulrity is avoided by providing light weight concrete/ Low weight masonary or by providing structure with more wood materials.

The structure should be built in a well symmmetric manner.

3.

• Structure is not symmetric.
• Larger strength is provided hence low ductility
• Redundancy in the vertical direction is not provided properly.
• In this building, there is no proper placement of masonry infill walls.
• As the building fully collapsed that means improper reinforcement is provided.