Learning Forum

[Sneha E S]

I want to actually check the fatigue life of a reinforced beam with both ends fixed, but when I ran the software for results, it showed "invalid/missing stress life curve,"  so just to make sure everything was right, I checked for total deformation, and this is the result I obtained. What is the issue? Should I provide a connection between the reinforcement and concrete? If so, how should I do it?

[Erik Kostson]

 

Hi

Instead of beam Model Type use reinforcement type for the rebar. See here for more info and images showing this:

 

/forum/forums/topic/contact-modeling-for-steel-rebars-in-concrete-using-ansys-workbench/

 

As for the fatigue analysis it is most likely not very suitable for concrete.

 

All the best

Erik

 

[Sneha E S]

 

What should I do here to complete the contact, I am new to ansys,so please excuse my silly doubts.

Also, when i checked above posted reply, there are commands shown for analysing the reinforced beam, is it necessary to do that?

[Erik Kostson]

Hi

No need for contacts and commands.

 

Do as follows:

In that post/link I gave above, see my response and the image which shows how to set the beams to reinforcements):

"We have a much better workflow now (in 2020 release and onwards) for the rebars using the reinf264 elements - you just add your steel rebars as line bodies and then use a reinforcement type (see yellow highlight in the image below) in mechanical instead of beam and they will be automatically embedded in the concrete. So we do not need any contacts or anything. Just use reinforcement type"

All the best

Erik

[Sneha E S]

Thank you, I got the result for total deformation, but when I checked the same for fatigue its saying, "An error occurred inside the FATIGUE module: Invalid or missing stress life curve". I have used structural steel as material for reinforcement, which already has SN curve in it. This is part of my project work so I have to do this analysis on reinforced concrete beam itself.