Not converge when runng

[BuuNguyen]

Hi STKO support team,

I tried to simulate a soil-mat foundation interaction by assuming a rigid mat foundation. By setting EqualDOF all points of mat foundation to the center point. And a system of spring was applied to connect the center point of the mat foundation and a fixed point.

However, the model can not converge, Can you please help me to figure it out?
Thank you for your support,
Buu

[STKO Team]

Some issues:

• don't put SP constraint (fix rotations) to the slave of the an MP constraints while using transformation method -> I fixed the rotation at the base
• The zeroLength does not work with a node-element link -> converted to node-node link
• add material to the Rz (torsional) DOF of the zeroLength -> otherwise is singular. I put a 1.0e12 material, check if it stiff enough
• I removed, while testing, the modelSubsets, in this example it's not necessary