Designing Chords and Collectors using ETABS

[zeemas]

Does any body help for designing Chords and Collectors for Concrete rigid diaphragm from ETABS?
I have tried to extract the forces from ETABS using SemiRigid diaphragm approach but the axial force diagram doesnt looklike good numbers.
Any suggestion, any idea?

Thanks.

 

[slickdeals]

Rigid Diaphragm assignment will never give you any axial force in the members. You will have to use a semi-rigid diaphragm to extract axial forces in floor framing members.

 

[zeemas]

Slickdeals

I have mentioned the same thing that I am using Semi Rigid diaphragm. The question is that forces are not giving me good sense of understanding for collector beams. I have asked if you guys can give me some idea that how u design chords and collectors for rigid floor using ETABS.

Thanks.

 

[slickdeals]

I am guessing one of the ways you can check it would be to check the shear in the lateral force resisting element at a level and then looking at the axial force in the collector beams. Maybe others have better ideas.

 

[zeemas]

I have already checked that and this was the basis that I am saying that forces doesnt look right. The forces doesnt even close for shear in the lateral force resisting element and axial force in the collector beam. I calculated manually rigidity of each wall floor by floor and distribute the forces base on rigidity and designing for that.

Thanks for your response.