I have built a 4 noded quad structure for the gable walls to help create a uniform mesh for 4-noded shell. The mesh is getting interfered by the nodes of the micro-model (shown in screenshot below). How do I create an interaction between the wall, wood frame and the cgi roof and still keep them separated? I don't the properties of the wall transferred to the roof element.
I had a look at your model and the geometry of the transverse walls where corrupted (probably due to not-so-accurate boolean operations). I changed them so that now they can be meshed. If you remember, during our meeting I told you that it is better to keep the top portion of the transverse walls as homogeneus, since it will be difficult for you to generate valid geometries for structured quad mesh (it can be done, but you need to master meshing techniques). This is how I changed the transverse walls, the violet geometry has an homogenous property, that is a mix of mortar and stone (obtained with a layered shell section with alternating layers):
- twall.png (12.48 KiB) Viewed 4836 times
Then I simply created SelectionSets with the walls and roof boundaries for easy seleciton of masters and slaves for the interactions. Then I generated 3 interactions. At the moment they have EqualDOF condition.
I was wondering how do I lay one physical property on top of another, like the roof faces should be on top of the wooden room frame, not falling in the middle, exposing the frame (shown in screenshot below).
You can do it by physically separating the roof geometry from the frame geometry (now they are a single geometry), offset them apart, and then creating an interaction (rigidLink) between them. However this is not convenient.
An easier way is to create a Layered cross section for the roof, adding just 1 layer with a "Dummy" linear elastic material, under the "Real" layers of the roof.
This "Dummy" material will have a Young's Modulus = 0, so that it generates 0 stresses. At the same time it will have a thickness = RoofBeamHeight/2. So that it will act as a rigid offset.
Also, what's the best way to apply nailed connections?
Insead of assigning an EqualDOF condition to the interaction that should represent nailed connections, you can create a physical property and element property for zeroLength elements.
In the physical property you can define the unixial material that you want for the shear behaviour of the nails (and of course, you need to equalDOF the remaining DOFs). In those uniaxial materials you should input values as per unit-length. Then in the ELement Property, check the "distributed" option. In this way STKO will generate appropriate lumped zeroLength elements based on the mesh size