Dear all,

How to calculate in plane and out plane bending moment. As per B31.3, sec 319.4.4 a&b Flexibility stresses, in that i try to calculate bending stress (sb) for elbow. As i found Ii and Io based on appendix D. Could some one please guide to calculate Mi and Mo.

Thanks

Mi and Mo are component moments acting at a given point and are the result of a structural analysis of the piping system.

hai Moverz,

Thanks, where i have to get the result of a structural analysis of the piping system. Is the standard value for Mo and Mi.

Thanks once again moverz...

Caesar II and all similar programs execute a structural analysis of a given piping system.

Think of it as 'round beams' with temperature added. The theory applied is all common to most 3D structural analyses.

Due to the complex nature of a piping system it is not possible to come up with a meaningful set of equations to give you 'Mi' and 'Mo' values.

Hai Moverz,

can use below formula to calculate Mi and Mo.

Please Confirm.

thanks..

No, instead you may find useful to open a book where bending moments diagrams are explained.
After that you would discover yourself the meaning of "elbow subject to in-plane bending moment" and "out-plane bending moment".

Hope now is clear what MoverZ said "Mi and Mo are component moments acting at a given point and are the result of a structural analysis of the piping system."


Best regards.