analyers

[Dongzheng]

Dear STKO team: I built a model of a suspend-dome. It includes a reticulate shell, a ring cable and a tie rod. The reticulate shell is simulated by a NonlinearBeamColumn element, and the cables and ties are simulated by TrussSection elements assigned to ElasticPPGap material properties. Due to the need to model the cable, pull rod and support between the hinge. So I use the zeroLength unit module. However, the model does not converge to the occurrence of errors. Can you give me some advice? Thank you!

[STKO Team]

First, your model is not fixed against rigid body displacements.
Second, when you model trusses, they already don't have rotational stiffnesses. If you link them with 6-DOF zeroLengths you will have singularities in rotational DOFs