## General Mechanical

#### Ultimate load and Ultimate deflection

• naik_shrihari
Subscriber
How to get ultimate deflection and ultimate load for RCC beam?
• peteroznewman
Subscriber

Start by learning how to create a RCC beam in ANSYS with the proper material properties that will provide the softening behavior that will deliver an ultimate load point in the load-deflection curve.

Here is a good discussion on concrete models.

Here is a post with links to three discussions on SOLID65.

• naik_shrihari
Subscriber
Load Vs Deflection curve is linear. Where have I gone wrong?
Could you please tell me what do you mean by softening behavior?
• Sandeep Medikonda
Ansys Employee

Hi Naik,

Softening behavior refers to the damage that occurs in the stress-strain behavior of a concrete material. Please go through this article for some additional description.

Now, when you have this behavior included you would see a load vs deflection as discussed in this paper, which helps you determine the ultimate load vs deflection.

Hope this helps.

Regards,

Sandeep

• naik_shrihari
Subscriber
Thank you so much for the answer Sandeep.
• naik_shrihari
Subscriber
Hi Peter
Could you please explain what does tbdata 1,0.3,1,0.304,4.278 mean in the list of commands mentioned in one of those links that you shared ?
• peteroznewman
Subscriber

Hi Naik,

TB = table and is used to send a table of values to a material model. The specific meaning of the values after TB depend on the preceding command.

Here is a relevant post.

Regards,

Peter

• naik_shrihari
Subscriber
Thank you Peter. I have now understood the meaning of tb. But those values aren't still clear to me. What do those values (1,0.3 and so on) represent?
• Sandeep Medikonda
Ansys Employee

Hi Naik,

These values correspond to what is in the TB command. So depending on that, the TBDATA would point to different material parameters such as poisons ratio, yield stress etc. Now in your case, it looks like 1 corresponds to the first data point and 0.3 to the poisson's ratio. Checkout this part of the manual for understanding material data tables.

~Sandeep

• naik_shrihari
Subscriber
Thanks a ton for the response Sandeep !