48202096
Structural
- Apr 10, 2013
- 3
Hi IceBreakerSours
I am a civil engineer, recently i was trying to model a three-dimensional steel frame with rigid diaphragm, to do this i have to use Kinematic Coupling in ABAQUS. However i am geting some error. For example i define an extra RP(reference point) at each story level and constraint three dof (U1,U2,UR2)(2 translational and 1 vertical rotational dof) of the Coupling Node to the RP. However i think because of using the Kinematic constraint, The dof of RP is now activated which means that the dof that i am not constraint (U2,UR1,UR3) to can be free to translate and rotate, so i'm starting to get error due to the singularity problems. I try to fix the problem by providing a boundary condition to the unconstrained dof of the RP, however my result start to get ugly because the extra boundary that i specified (eg. i think the boundary condition provide an extra constraint to U2 which is the vertical displacement of my frame that is supposed to be independent with the constraint equation). I am performing an geometrical and material non-linear analysis.
I was just wondering if you have any thought to my problems.
Many Thanks.
Peter
I am a civil engineer, recently i was trying to model a three-dimensional steel frame with rigid diaphragm, to do this i have to use Kinematic Coupling in ABAQUS. However i am geting some error. For example i define an extra RP(reference point) at each story level and constraint three dof (U1,U2,UR2)(2 translational and 1 vertical rotational dof) of the Coupling Node to the RP. However i think because of using the Kinematic constraint, The dof of RP is now activated which means that the dof that i am not constraint (U2,UR1,UR3) to can be free to translate and rotate, so i'm starting to get error due to the singularity problems. I try to fix the problem by providing a boundary condition to the unconstrained dof of the RP, however my result start to get ugly because the extra boundary that i specified (eg. i think the boundary condition provide an extra constraint to U2 which is the vertical displacement of my frame that is supposed to be independent with the constraint equation). I am performing an geometrical and material non-linear analysis.
I was just wondering if you have any thought to my problems.
Many Thanks.
Peter