Modelling of 25 storey building with the specified properties using ETABS

AIM:

To model a 25 storey building using ETABS,with column 800x800mm and beam 300x400mm and slab 150mm.

PROCEDURE:

• Open ETABS and set the initializatiion.

• Set the grids and storeys

• Check if the translational fundamental natural period of vibration in both the x and y direction is approximately: Tx1��1= 4.4 second Ty1��1= 4.2 second

In X direction=4.17

Y direction=4

This check will help confirm if modelling is done correctly. Some deviations from the above values is possible (± 2%). But any major deviation will suggest an error in modelling.

• Check if the following provision in Table 5 of IS 1893 (part 1) – 2016, on torsional irregularity satisfied:

The natural period corresponding to the torsional mode of oscillation must be less than the two fundamental translational modes of oscillation along each principal plan directions. YES

• Check if the two provisions of clause 7 in Table 6 (shown below) of IS 1893 (part 1) – 2016, regarding vertical irregularity is satisfied

1.yes

2.No