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Problem with generating a curve load against deflection graph (Reinforced concrete beam)

- July 10, 2018 at 3:42 pm
  
  Joseph Lim
  Subscriber
  
  Dear community,
  
  I having a problem with generating a curve graph of the load against deflection as attached below. I face this problem for about half a year, but I was not able to solve it. I am wondering if there any possibility that the ANSYS workbench able to identify the ultimate load of the beam. If can, may I know how it can be done? Thank you very much in advance and sorry for the inconvenience.
  
  Regards,
  
  Joseph Lim
- July 12, 2018 at 3:38 am
  
  Sandeep Medikonda
  Ansys Employee
  
  Hi Joseph,
  
  Didn't Peter already answer this in your previous discussion? If that didn't help, can you please give some more info on the exact error/problem that you are facing?
  
  You can also do an eigenvalue analysis to determine this?
  
  Regards,
  
  Sandeep
- July 13, 2018 at 1:50 am
  
  Joseph Lim
  Subscriber
  
  Hi Sandeep,
  
  1) Yes, thanks to Peter in the previous discussion, I was able to generate the cracking of the beam. But I realized that I was not able to identify the ultimate load because the load is increasing together with the deflection. Theoretically, the load will start to decrease after reach the failure mode as shown in below figure.
  
  2) Thank you for your suggestion using the eigenvalue analysis. If not mistaken, in this analysis, a gradually increasing load is applied to seek the load level at which the structure becomes unstable. May I know how to identify the unstable structure?
  
  Thank you in advance and very sorry for the inconvenience.
  
  Regards,
  
  Joseph
- August 28, 2019 at 9:03 pm
  
  Chinyere
  Subscriber
  
  Hello Joseph,
  
  I'm faced with the same situation. I applied my load using in load steps and using the program controlled option. With the load steps option the graph is not what I'm expecting and with the program controlled option, I'm getting a linear elastic curve.
  
  Did you get a solution to this problem?
  
  Regards,
  
  Chinyere
- April 28, 2020 at 1:22 am
  
  Emad64
  Subscriber
  
  Hi Joseph and Chinyere
  I’m struggling with the same problem. I’m m a RC concrete slab. I applied displacement instead of force. But the load keep increasing! (No negative slope). I’m wondering if you figured out how to solve this problem?
  
  Thanks.
  
  Kind regards Emad
- February 28, 2023 at 4:41 am
  
  Smruti Pritam
  Subscriber
  
  Sir,
  How i can plot load -deformation graph for the RC slab? And how to check the ultimate load for a slab?

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