Modelling of 25 storey building with the specified properties using ETABS

Exercise Result

• Criteria : Fundamental Translational natural period.

Desirable solution :

X-direction : 4.4 second

Y-direction : 4.2 second

Result :

X-direction : 4.41 second

Y-direction : 4.22 second

• Criteria : Torsional irregularity

IS 1893-2016(Part-1) Table-5

Desirable solution :

a. Torsional mode Time period should be lesser than X and Y direction time periods

Result : YES

Criteria : Vertical irregularity

IS 1893-2016(Part-1) Table-6 Clause-7

Desirable solution :

a. First three modes together should contribute at least 65% in mass participation factor in each principal direction.

b. Fundamental lateral natural periods in two principal plane directions are away from each other by at least 10%.

Result :

a. YES

b. NO

• Criteria : Inter-storey Drift

IS 1893-2016(Part-1) Clause-7.11.1.1

Desirable solution :

Storey drift shall not exceed 0.004 times the storey height for base shear with no load factors (4x10-3).

Result : YES

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