I am modeling a braced excavation where before excavating below a given level, an intermediate shell is created that is reinforced with transverse beams as in the figure:
where the bracing consists of a shell and struts, which should add bending resistance to the shell.
For reference, I am creating the shell first, after Excav 1 but before Excav 2. This creates links between the shell and the soil below, which will be excavated after creating the beams.
I then create the beams using the following data file:
This does create some links but I’m not sure with they are with the shell or with the zones:
However, when I excavate below using
cmodel assign null, this removes the links:
And the beams are not linked to the shell, as shown below with 10x scale:
I tried to make the nodes coincident between beams and shell, and even tried
struc node join after nulling out the zones, in which case I get an error that reads:
“Recursive rigid links exist on SEL node 41, link 266 in DOF 1”
Please let me know how to join the beams to the shell, thank you.