A shell element, simply-supported at its corners, is shown on the left side of Figure 1. The images on the right side present the same shell element with an edge beam along its side.
Question
These shell elements are meshed using 4x4 sub-elements, though no connection is created between the shell and the edge beam. Given this condition, I would expect the shell and beam to deflect independently from one another. However, the deflection contours indicate that the beam stiffens the system against out-of-plane behavior. Is there an explanation? And how are these components modeled to behave independently?
Figure 1 - Shell model and deflection with and without edge beam
Answer
When frame and shell elements are meshed, joints are created along their interface and merged by default. If this connection is not desired, users should divide the elements explicitly, then select the merged joints which were automatically created, and then select Edit > Point > Disconnect to create duplicate joints at the same location. Selected degrees of freedom (DOF) may then be reconnected, if desired, using weld constraints.
Attachments
- SAP2000 V12.0.0 model (zipped .SDB file)
