Problem with Gravity Load

[lindaatik]

Hi Silvia,

I have U-shaped retaining structures with soil backfill. When I try to add the mass of the structures as node loads, I get the following message:
"Node::addunbalLoad - load to add of incorrect size 2 should be 3"

The nodes have ndf 3 and I am using:
pattern Plain 1 Linear {
load $tag1 0.0 [expr -9.81*$M] 0.0;
}

Can you please let me know what's wrong?

Thanks a lot,
Linda.

[silvia]

why don't you put in
puts "load $tag1 0.0 [expr -9.81*$M] 0.0"

and see what comes out. likely, i am guessing, $tag1 is blank.

[Ricsey]

I have the same error, but with different problem.

This is my sample code:

pattern Plain 10000 Linear {
foreach node $NODES px $PX py $PY {
load $node $px $py 0.0
puts "$node $px $py 0.0 "
}
}

the ndm is 2 and the ndf is 3
the NODES vector is from the opensees command from where I can get the node ID-s.
px and py are not empty, because in the output I check it as you see (puts "$node ...")

After a first iteration I got this error:
Node::addunbalLoad - load to add of incorrect size 3 should be 4
What does this means?

[Ricsey]

And another note for this.
If I change the nodal load row to:
load $node $px $py 0.0 0.0
the following appears:
Node::addunbalLoad - load to add of incorrect size 4 should be 3
This is the opposite of the previous one.

[Ricsey]

I need an answer pls!

[mhscott]

Can you post more of your script, like how you define NODES, PX, and PY arrays/lists?

[Ricsey]

If you send your email I could give you. It is a bit difficult model, it has a lot of files, I got this from the Standford University.
mhscott wrote:
> Can you post more of your script, like how you define NODES, PX, and PY
> arrays/lists?