*Constrained_Beam_In_Solid_Penality

[Solomon Abebe]

Hi there,

I am a third-year PhD student working on corrosion, and I need to introduce a deteriorated bond between corroded steel and concrete. I am using the general bond stress–slip relationship from Bulletin 65 of the fib Model Code for Concrete Structures 2010, and I am trying to implement it in my LS-DYNA model using *CONSTRAINED_BEAM_IN_SOLID_PENALTY.

However, I am struggling with the BONDC parameter (please see the attached pic). It doesn’t seem to be working for me, or I may not be interpreting it correctly. The manual states that BONDC = B10 + A, but I am not sure what this means in practice. The rest of the fields are straightforward to input using the fib model, but this specific definition of BONDC is unclear to me.

Could you please explain what BONDC = B10 + A means, ideally with some sample numbers?

Thank you very much for your support.

Best regards,
Solomon

[SUMAN KUMAR]

Dear  Solomon,

BONDC means you need to define the condition of the bond. Let me explain,

As per LS DYNA suggestion BONDC=B10+A

So, if there are stirrups in the model, then A=1, and the condition of the bond is good, then B=0, then BONDC=0x10+1=01. Similarly, if any other bond condition is there, the B=1 and hence BONDC=1x10+1=11. Now, you can do the rest, I guess.

Regards,

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[Solomon Abebe]

Dear Suman,

Thank you for your kind reply.

I tried to model it according to your suggestion, but unfortunately, it is still not working. Please see the attached screenshots. The error message on the model code line# 13851 indicates that there is improperly formatted data.  

  Do you think the blank fields highlighted in yellow between end and axfor, axfor and pssf, and pssf and xint—might be causing the problem?   

I would sincerely appreciate any further assistance.  

Best regards, 

Solomon 

[SUMAN KUMAR]

Please check LS DYNA solver version as this is relatively new update. Previously it was not available maybe before 2023

With Best Regards, SUMAN KUMAR, Research Scholar, Structural Engineering Division, Department of Civil Engineering, IIT Guwahati, North Guwahati, ASSAM, 781039, India, Contact: +91-8709705539

[S]

Sure, I’ll check that out. Thanks again!

Best regards,

Solomon