Problems with identifying the ultimate load of the beam

Dear all, 

I am trying to run an analysis of a simple supported reinforced concrete beam in Ansys Workbench 14.5. However, I was not able to identify the ultimate load of the beam. The load-displacement curves don't line up the way I would expect based on the results outcome. From the modelling results, the applied load is directly proportional to the deflection. Do you have an idea? Thank you very much in advance for your help and time. 

Comments

  • AdisaAdisa Member
    edited June 2018

    Hi,

    Put your .wbpz file (File>Arhive), in the above attached file miss "Flexural Solid Beam_files".

  • peteroznewmanpeteroznewman Member
    edited June 2018

    Adisa,

    After I extracted the zip file contents, I found the .wbpj file inside the _files folder. I just moved it out of there and put it in a folder one level up where the _files folder was and I was able to open the project in Workbench.

    Peter

  • AdisaAdisa Member
    edited June 2018

    Yes Peter, you are right!!

  • Joseph LimJoseph Lim Member
    edited June 2018

    Thank you Peter

  • peteroznewmanpeteroznewman Member
    edited June 2018

    Lim Yong Tat,

    Have you looked at using a SOLID65 element for your concrete?

    There are several posts here about SOLID65 and concrete, which can support cracking and a subsequent loss of load carrying capability.

    One

    Two

    Three

  • Joseph LimJoseph Lim Member
    edited June 2018

    Adisa,

    From my results, the applied load is directly proportional to the deflection, where I was not able to identify the load-displacement response, yield point and ultimate capacity. Any advice and suggestion on this problem (where I can get the curve load vs deflection graph)? Thank you very much in advance for your help and time.

  • Joseph LimJoseph Lim Member
    edited June 2018

    Thank you, Peter,

    You have been so much helpful.

    Previously, I have looked at that matter (using the SOLID65 element for the concrete element). But I was not able to make it. From the solution information, I realised that my concrete was using the SOLID187. Any suggestion on how to change SOLID187 to the SOLID65 element? Thank you very much in advance for your help and time.

     

  • peteroznewmanpeteroznewman Member
    edited June 2018

     You have to put a Command item like this under each body that is concrete.

    et,matid,solid65

    MP,Ex,matid,1500

    MP,Prxy,matid,0.2

    MP,Dens,matid,2400e-9

    TB,concr,matid

    tbdata,1,0.3,1,0.304,4.278

     

    Like this

  • Joseph LimJoseph Lim Member
    edited June 2018

    Peter,

    After I have changed the concrete to SOLID65 using the command item, one problem I encounter (when solving the model). Same problem I face previously when I am using the command item. It does not allow me to change the SOLID187 to SOLID65 element (as attached below).

    Is this problem due to the beam geometry? Any recommended solution? Thank you very much in advance for your help and time.

     

     

     

     

  • peteroznewmanpeteroznewman Member
    edited June 2018

    Click on Geometry and in the Details window, change Element Control to Manual.

    I hope that is the same in Version 14.5 and if not, search the Help system for how to do that.

  • Joseph LimJoseph Lim Member
    edited July 2018

    Dear Peter,

    May I know the commands below is under which concrete grade? Thank you in advance and very sorry for the inconvenience.

     

    et,matid,solid65

    MP,Ex,matid,1500

    MP,Prxy,matid,0.2

    MP,Dens,matid,2400e-9

    TB,concr,matid

    tbdata,1,0.3,1,0.304,4.278

     

     

    Regards,

    Joseph

     

     

  • peteroznewmanpeteroznewman Member
    edited July 2018

    Dear Joseph,

    I don't know about concrete grades. You will have to explain that.

    The material properties above are Young's Modulus (Ex), Poisson Ratio (Prxy) and Density (Dens).  Look in the ANSYS Help for the CONCR material model what the numbers in the tbdata mean. 

    Remember that Command snippets are in the units of the Project so you mustn't change the Project units after you use command snippets or you will get the wrong answer!

     Regards,

    Peter

  • Joseph LimJoseph Lim Member
    edited July 2018

    Peter,

    Thank you very much. You are the best teacher that helping me a lot. 

    Regards,

    Joseph

     

     

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