Modelling of 25 storey building with the specified properties using ETABS
- The fundamental translational natural period at X- direction is 4.58 and Y- direction is 4.37 therefore it is approximately equal to the value given.
- The torsional mode time period is lesser than X and Y direction time periods.
- First three modes together should contribute atleast 65% in mass participation factor in each principal direction.
- Fundamental lateral natural periods in two principal plane directions are not away from each other by atleast 10%.
- The storey drift is not exceed 0.004 times the storey height for base shear with no load factors (4X10^-3).