Staad Pro Column Design Result

Can you please send the model for us to investigate the issue? Also,please mention the version of Staad.Pro you are using. (Help>>About Staad.Pro)

This is quite feasible. The required area of column reinforcement depends on the critical condition of interaction of both axial force and flexure developed in the column. I have also noticed the same in  few models I had handled before.

The axial load would be greater at the lower column as the axial forces is getting acccumulated as we go down. But flexure will not behave in similar fashion.

The flexure developed in a column depends on the floor to floor height (column length), The relative stiffness distribution ( see below, on the top floor,, the  beam moment is transferred only to one column member, whereas, in case of the intermediate floor, the beam moment is shared between the two connected columns). Thirdly, if the model is simply a frame model without the consideration of infill brick wall, then the flexure on the column is expected to be very significant compared to the axial force developed in the column and hence the top floor may attract more flexure than the lower one.

However, if the above point does not hold good for your scenario, then kindly send us the model for further investigation.

Please find attached file of my design.

I am using staadpro v8i.

I saw your model and the explanation I provided in my earlier thread holds good for  this model.

                                                         I could see the  flexure developed in the column of upper sory relatively more than the lower one.

                                                         See the example below

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hi sir Geeky,

is there any way to minimize this kind of scenario? that the steel reinf of column is greater than the lower column?

rekcah