Regarding OpenSees

[gourik]

Hi I am getting following while running tcl script of structural frame on OpenSees.

"ProfileSPDLinDirectSolver::solve() - aii < 0 (i, aii): (0,0)
WARNING Linear::solveCurrentStep() -the LinearSOE failed in solve()
DirectIntegrationAnalysis::analyze() - the Algorithm failed at time 0.01
OpenSees > analyze failed, returned: -3 error flag
-3
"

tcl script of model is very large which is not possible to copy n paste over here.

[silvia]

run an eigen command before the analysis to check that the model is properly constrained and that you are gettin a good period.

[gourik]

Thanks for your quick reply

I added the same and got the following error
"terminate called after throwing an instance of 'std::bad_alloc'
what(): St9bad_alloc
Aborted
"

[silvia]

something is up with your model.

[gourik]

I have tried one small script as given below ..
"wipe all
model BasicBuilder -ndm 2 -ndf 2
#####Materal Information#######
nDMaterial ElasticIsotropic 1 432000.000 0.3
#####Node Information#####
node 1 -9.663 1.398
node 2 -7.549 4.176
node 3 -3.425 -0.647
node 4 -5.435 6.955
node 5 -1.979 0.874
node 6 -0.534 2.394
node 7 2.813 -2.691
node 8 4.508 0.052
node 9 6.203 2.796
####Element Information###
element quad 1 2 5 3 1 1 PlaneStrain2D 1 0 3.4161 0 0
element quad 2 4 6 5 2 1 PlaneStrain2D 1 0 3.4161 0 0
element quad 3 5 8 7 3 1 PlaneStrain2D 1 0 3.4161 0 0
element quad 4 6 9 8 5 1 PlaneStrain2D 1 0 3.4161 0 0
######Boundary Information######
fix 3 1 1 1
fix 17 1 1 1
fix 27 1 1 1
fix 28 1 1 1
fix 9 1 1 1
fix 23 1 1 1
#######Point Load information
pattern Plain 1 "Linear" {
}
constraints Plain
algorithm Linear
numberer Plain
system ProfileSPD

# create the analysis object
analysis Static

# perform analysis
# numSteps del_t
analyze 1

print Default_Title.flavia.res node -flag 1"

still it gives same error

ProfileSPDLinDirectSolver::solve() - aii < 0 (i, aii): (0,0)
WARNING Linear::solveCurrentStep() -the LinearSOE failed in solve()
StaticAnalysis::analyze() - the Algorithm failed at iteration: 0 with domain at
load factor 1
OpenSees > analyze failed, returned: -3 error flag
-3
"

[silvia]

someone in the geotech might be able to help you, i'm no expert in solid elements.

[fmk]

nodes need to be numbered ANTI-CLOCKWISE

[kavya1811]

I couldnt see the loads applied on ur model....
that might be the reason for the error you got..check it out