Modelling of 25 storey building with the specified properties using ETABS
Q1.
AIM:
The aim is to design and analysis a 25 story building model in etabs .
material used :
Structural Element Sizes
- Beams : 300 × 400 mm
- Columns : 800 × 800 mm
- Slab : 150 mm thick
Material Properties
- Grade of Concrete : M30
- Grade of Steel Reinforcement Bars : Fe 415
Loading
- Dead Load on beams from infill wall : 10 kN/m (Let us assume the same for roof floor in view of parapet)
- Live load on floor : 3 kN/m2 (Let us assume the same for roof floor)
| Criteria | Desirable solution | Exercise results | |
| Fundamental translationalnatural period | X- direction | 4.4 second | 3.7 |
| Y- direction | 4.2 seccond | 3.5 | |
| Torsional irregularity |
IS 1893 - 2016(part-1) table 5 |
Torsional mode time period should be lesser than X and Y direction time periods | yes |
| Vertical irregularity | IS 1893 - 2016(part-1) table 6 | First three modes together should contribute at least 65% in mass participation factor in each principal direction | yes |
| Fundamental lateral natural periods in two principal plane direction are away from each others by at least 10% | yes | ||
| Inter - storey drift | IS 1893-2016(part -1 ) clause - 7.11.1.1 | Storey drift shall not exceed 0.004 times the stroey height for base shear with no load factors(4*10^-3) | yes |