Modelling of 25 storey building with the specified properties using ETABS

AIM:
⦁ Modelling of 25 storeys building with specified properties using etabs.

PROCEDURE:
⦁ open etabs and select the new model and make the following settings.

⦁ an interface appears as shown, click the custom grid spacing and maintain the spacing as 4m in both x & y directions.

⦁ click ok, a box appears,enter the stories upto 25 maintaing height of 3m except for base to plinth in which is 1.5m and 1st storey is entered as master story.

⦁ now go to define and select material properties, and enter the following.
⦁ M30 grade concrete and steel 415

⦁ now go to the load pattern,and enter the loads as shown.

now go to define option and select mass source and assign the mass source as shown.

⦁ now select the quick draw column from the screen and place the columns at each grid.

⦁ similarly place the beams and slabs.

⦁ now assign the load to all floors,select all the beams and go to assign option.
⦁ select the load as super dead load and 10kn/m.

⦁ and assign the live load as 3 kn/m2.

⦁ and assign the diaphragm load.

⦁ now go to the analyse and check model.

⦁ go to the display and select shown tables and then modal mass participating ratios.

⦁ from the table we can say that time period of mode of torsion is less than fundamental mode.
⦁ first 3 modes contributre more than 65% in the mass participating ratios of each plan direction.