Hi all, we already know that to model a bond between reinforcement and concrete, we can use contact one-dimensional model and also give user defined bond laws using Beam in solid function.
My problem is: How can I use the same contact_1D function which is hardcoded in the software and use the same function used there in the BEAM_IN_SOLID through define function for the contact law.
I simpler words C_1D restricts the user in the selection of master and slave nodes and that's why for complicated reinforcement mesh I want to use the bonding law as used in C_1D in Beam_In_Solid function.
My script is not giving satisfying results.
float force(float slip,float leng) { float force,pi,d,area,shear,pf,s1,s2,s3,tmax,tf; pi = 3.1415926; d = 8; pf = 0.4; area = pi*d*leng; if (slip < 0.34) { shear = slip*pf; } else { shear = .0136*10**-(0.218*(slip-0.34)); } force = shear*area; return force; }
Debonding processes can be modeled with a user defined function or user provided subroutine giving the axial shear force based on the slip between rebar nodes and concrete solid elements. This feature is invoked by setting the AXFOR flag to a negative integer which refers to the *DEFINE_FUNCTION ID or a number greater than 1000. In the latter case, the user must modify the subroutine rebar_bondslip_get_getforce() in dyn21.F to add in one or more debonding laws, each tagged with a “lawid.” An AXFOR value greater than 1000 will call the user subroutine and pass AXFOR in as “lawid.” CDIR must be set to 1 in this case to release the axial constraints.
Dear all and especially @Kabir,
I completely agree to your point ..
But while I try to model exactly the contact_1d function through Beam in solid defined function ( not through subroutines and giving 1000 axforce) I'm not getting satisfactory results.
I've included the script, may be you can check
Thank you for your kind message. I wished I had time to check your modeling, but really I am very busy. I wish you the best of luck.
I haven't tried *CBIS incorporated with C1D before, but I believe you can build the bond-slip relationship (force vs. slip) and include it as a function. I'd recommend conducting lab tests to build the bond-slip relationship. You may also follow some standards, namely fib 65 (Model code 2010 for concrete structures). In general, C1D may influence your beam response in certain cases. I do usually neglect it in my nonlinear modelling for beam-slab structures.
Regards..
Muhannad Husain Thanks for the response. I have successfully implemented it. And also verified it.
Again, a lot of appreciation for you.
You are most welcome. I am very glad that I could be helpful for you to get the answer to your question.
Good luck.
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