P-M Interaction diagram using Caltran guidelines

[RK Sriwastav]

How to obtain a PM interaction using Caltrans guidelines ?

RK Sriwastav

 

[le99]

Per my understanding, the way to construct P-M interaction diagram is a universal practice, which is present/covered in all reinforced concrete textbooks. Why do you think Caltran's practice is any different?

 

[RK Sriwastav]

Thank you @le99 for Answering.

This question is based on a confusion in SAP2000. SAP2000 (in section designer) gives two type of PM interaction plots i) Caltrans interaction surface ii) interaction surface (which is based on design codes). These two plots are greatly different.

What could be the reason for this difference ?

RK Sriwastav

 

[le99]

It seems like the first is the unit axial P-M diagram, and the second is the biaxial P-M diagram. If it is not the case, can you post the non-conventional diagrams?

 

[RK Sriwastav]

Dear @le99,

Both i) Caltrans interaction surface ii) interaction surface (which is based on design codes)are biaxial P-M diagram. I have attached the SAP2000 diagrams.

RK Sriwastav

 

[EireChch]

stick this in the structural forum to get more responses.

 

[RK Sriwastav]

Thanks @EireChch

RK Sriwastav

 

[le99]

Other than 3D presentation, I don't think it is any different than the traditional biaxial P-M diagram.