Nonlinear Bedding to Quad Areas

SOFiSTiK
1

Hi all,

one of my colleague showed me a feature within Sofistik that I did no know existed.
Essentially, if I wanted to perform a structural analysis for tension only bedding for quad elements (i.e. structural areas) but without limitation to the compression stress, there is no need to define a specific material bedding.
It is sufficient to perform a non linear springs and bedding analysis for the normal bedding defined in the quad definition. Is this correct?

I did tested this feature myself and effectively it seams to work, however in all the guides/tutorial/videos I’ve seen it is always mentioned that a specific material bedding must be defined (with non linear analysis) to allow for compression only.

Essentially, by default, for a non-linear analysis ASE will cut-off the tensile stress automatically if a normal bedding is defined. Is this also applied to the transverse bedding?

I tried to find the explanation in the manuals about this but with no success, could someone provide some refence of this in the manual?

Thanks.

2

Further to the above, how do I turn this feature off?
I understand I must use the GRP nnn VAL LINE command, but if I add it to my ASE run, it does not work.
Below my input.

+PROG ASE urs:22.1 $ Analysis of Combined Loads
HEAD Analysis of Combined Loads
PAGE UNII 0
CTRL OPT WARP VAL 0
SYST PROB nonl ITER 60 NMAT YES
GRP 101 VAL line
LC 1000
END

I get the following error

+++++ error no. 43 in program LOAD
Load or mass on node 1 loadcase 1000 not defined or node not activated.

Thanks.

3

Try;
Grp No - Val Yes
Grp No 101 Val Lin $ Same as Line but less printing

Normally you need to specify a default for all groups and then specifying single cases.

4

It worked with

GRP -
GRP 101 VAL LINE

Thanks for your reply.