Modelling of 25 storey building with the specified properties using ETABS

1) Objeactive of this project is to model and analyse 25 storey building in Etabs with the given data and verify results as per IS 1893.

PROCEDURES:

1. For grid label and grid ID:

2.Storey height and storey level

3.Material property:

Steel

Concrete

Beams and column sizes:

Column sizes:

Slab property:

Load pattern:

Mass source:

Load combinations:

Frame loads:

Wall loads:

Live load:

Assigning diaphragms to the slabs:

Restraints :

Restraints are assigned using selecting the bottom support nodes --> Assign --> Joint --> Restraints--> Pinned support

Results:

Table --> Analysis results --> Structure output --> Modal period and frequencies

Translation in X direction - 4.228

Translation in Y direction - 4.047

Torsional irregularity :

Mode 3 time period is lesser than mode 1 & mode 2 time period

Mode 3 time period - 3.155

Mass participation ratios :

First mode participation ratio is 80%.

Fundamental lateral natural periods of the building two principal plan directions are away from each other atleast by 10 percentage does not satisfy minimum requirements.

Storey drift:

In EQx direction

In EQy direction

Inter storey drift is below than 0.004( codal limit), satisfies the condition.

Conclusion:

Except the fundamental lateral natural periods of the building two principal plan directions are away from each other atleast by 10 percentage. Remaining codal requirements are satisfied.