Loading a ZeroLengthSection element is the easiest approach to compute the moment-curvature and shear force-shear deformation response of fiber sections in OpenSees. However, we cannot do a section warping analysis with a zero length element like we can with non-warping sections--at least not without modifying the ZeroLengthSection element to handle seven DOFs per node. That source code modification is … Continue reading Section Warping Analysis
Tag: Warping
Torsional Buckling
From time to time, I dabble with the OpenSees warping elements developed at the University of Sydney in 2011 for doubly symmetric sections, then in 2016 for open sections. Since my last foray into warping, I've taken the nonlinear displacement-based formulation from "it compiles" to "it works". Some other ancillary changes to the warping fiber … Continue reading Torsional Buckling
Wind in Warped Sails
The Island of Unfinished OpenSees Business grows every year. I own a few acres on that island and I'm sure you do too. Occasionally, items make their way off the island and get shipped to the mainland, i.e., the OpenSees GitHub repository. Take, for example, the warping frame elements developed at the University of Sydney … Continue reading Wind in Warped Sails
Portwood Digital 