Modelling of 25 storey building with the specified properties using ETABS
1)
ANS:
- draw the grids as per given quesrion.
- by selecting display grid data on spacing specify the grid spacing.
- next go to sorys ,select number of storys and height.
- select similar to option for making model simple.
- define material property by selecting the concrete and steel property.
- define section property of column 800*800 from bottom to top of building
- defining the steel and strrups diameter
- define section property of beam 300*400 minimum of 55mm for longitudinal group rebar centroid.
- select steel grade as per question for longitudinal and shear reinforcement.
- define the section property of slab as 150mm.
- draw by selecting quick draw slab.
- define the loads by selecting the load patterns and giving the live,dead and sesmic loads.
- define the load combinations ,selecting the auto load combinations.
automatic load combinations
- assign all the loads to the model.
- run the analysis ,deflection of the slab and beams of model.
- results of the model 25 story building.
conclusion:
the translational fundamental natural period of vibration in both the x and y direction is approximately Tx1=4.647 second Ty1=4.476 second.