Modeling compression only spring
Modeling compression only spring
(OP)
Hello everyone
I'm modeling a self-centering steel plate shear wall using abaqus.
As you know, in this system Post-tensioned strands create self centering property.
Beam to column connection type is rocking connection and to simulate it, used comprresion only spring.
This text is from thesis Patricia M. Clayton "Self-Centering Steel Plate Shear Walls:
Subassembly and Full-Scale Testing" :
The “compression-only springs” at the beam flanges were modeled using axial connectors with nonlinear behavior representing a high elastic stiffness in compression and very low elastic stiffness in tension
please guide me.
Please see attached photo
I'm modeling a self-centering steel plate shear wall using abaqus.
As you know, in this system Post-tensioned strands create self centering property.
Beam to column connection type is rocking connection and to simulate it, used comprresion only spring.
This text is from thesis Patricia M. Clayton "Self-Centering Steel Plate Shear Walls:
Subassembly and Full-Scale Testing" :
The “compression-only springs” at the beam flanges were modeled using axial connectors with nonlinear behavior representing a high elastic stiffness in compression and very low elastic stiffness in tension
please guide me.
Please see attached photo






RE: Modeling compression only spring
BA
RE: Modeling compression only spring
Mike Halloran
Pembroke Pines, FL, USA
RE: Modeling compression only spring
Stepwise procedures dividing time or loads on an increasing range, and checking each component step by step. You will need a nice iterative approach in order to solve() your data. It may worth the effort on a dynamic analysis i suppose.
But also i been thinking to set limits to the load. Maybe determining the yield load (or the one of your interest) as first load input and then a second load of interest. It's pretty similar to the above but with less steps and could be useful when stiffness is multilinear.
Good luck!
RE: Modeling compression only spring
RE: Modeling compression only spring
RE: Modeling compression only spring
RE: Modeling compression only spring
RE: Modeling compression only spring
you can bound the problem with two linear runs ...
1) use a simple spring, if compression load then ok, else
2) delete the spring and run again; if +ve displacement (indicating the spring would be in tension) then ok.
but if 2) gives a compression displacement then you need to model the spring properly.
another day in paradise, or is paradise one day closer ?
RE: Modeling compression only spring
So, the way I interpret this comment is that this axial member is intended only to represent the non-linear connectivity between two elements. If the member is in compression it acts as a rigid link. If the member is in tension, it has a near zero sttiffness.... likely to help with convergence issues in the abaqus solution.
RE: Modeling compression only spring
RE: Modeling compression only spring
most likely, unfortunately, some will misbehave and you'll be stuck with the NL run.
another day in paradise, or is paradise one day closer ?
RE: Modeling compression only spring