numerical singularity issue in ABAQUS
numerical singularity issue in ABAQUS
(OP)
Hello everyone,
I have been trying to model in ABAQUS (I am new to the software) a simple supported reinforced concrete beam. I have used solid elements for the concrete beam and wire elements for longitudinal rebars and stirrups.
The simulation keeps failing for 'numerical singularity' issues. I have checked my boundary conditions and constraints and everything looks fine. Both supports have U1=U2=U3=0 and all the reinforcement is constraint to the beam with an 'Embedded region' type constraint. The problem appears to occur on the node located on every longitudinal rebar (24 rebars along the perimeter of the section) at midspan. The red dot in the picture below shows the node where the singularity occurs, i.e. on the rebar at midspan. There are other 23 failures occuring at midspan and corresponding to the remaining rebars.

Do you have any suggestion on what the issue might be?
I appreciate your help.
Thank you very much.
Regards,
Martino
I have been trying to model in ABAQUS (I am new to the software) a simple supported reinforced concrete beam. I have used solid elements for the concrete beam and wire elements for longitudinal rebars and stirrups.
The simulation keeps failing for 'numerical singularity' issues. I have checked my boundary conditions and constraints and everything looks fine. Both supports have U1=U2=U3=0 and all the reinforcement is constraint to the beam with an 'Embedded region' type constraint. The problem appears to occur on the node located on every longitudinal rebar (24 rebars along the perimeter of the section) at midspan. The red dot in the picture below shows the node where the singularity occurs, i.e. on the rebar at midspan. There are other 23 failures occuring at midspan and corresponding to the remaining rebars.

Do you have any suggestion on what the issue might be?
I appreciate your help.
Thank you very much.
Regards,
Martino





RE: numerical singularity issue in ABAQUS
RE: numerical singularity issue in ABAQUS
Any suggestion how to solve this? I am only trying to repeat this exercise https://www.youtube.com/watch?v=XzJC8Nqf8vo#t=15.4.... I have exactly done what the guy in the video does.
However, I wonder if there is a more efficient way to model reinforced concrete with appropriate elements which I know they are available in ANSYS for instance. With these elements there shouldn't be the need to model the steel reinforcement.
Thank you for your replies.
RE: numerical singularity issue in ABAQUS
RE: numerical singularity issue in ABAQUS
RE: numerical singularity issue in ABAQUS
Abaqus Analysis User's Guide 2.2.3 Defining Reinforcement
RE: numerical singularity issue in ABAQUS