Plastic ratio Robot structural

[Anonymous]

 Hello,

I am realising a non linear analysis on a whole structure and I wish to know the plastic ratios on each bar, after running the calculations. However, when I open the plastic process history, the table is empty. How can I solve this? Even for the buckling analysis when I select P-Delta effects, the structure is safer than without P-delta effects, which doesn't make much sense considering the second order effects. How do I know if the loss of stiffness is being considered for the material?

Thank you,

Manuel Queiroz

[mustafahesenow]

Hi @Anonymous

Plastic ratios is available only for push over analysis and elasto plastic section.

For sure when you check P-Delta effect the reducing of the stiffness for compression members will work and moment will be magnified 

When Pcr/Pu < 10 P -Delta to be considered otherwise its not needed.