Modeling of diaphragm floor

is it possible to model a diaphragm slab in Sofiplus or in Text editor. I would like to have a slab which has infinitely rigid inplane stiffnes. Thanks.

Hey, as a variant you can try to increase the inplane stiffness of the entire group during calculation like this:

+PROG ASE urs:3
HEAD LINEAR ANALYSIS
CTRL OPT SOLV 4
LC 1,2
grp2 2 quea 100 $ factor = 100 for group № 2 
END
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