Convergence Problem

[khunglongkhelua]

Hi vesna

I made a simple spring model using steel02 material subjected to a ground motion. Based on the period of the spring and the response spectrum of the ground motion I estimate the displacement of the spring and calculate the corresponding initial stiffness and yield value ( K001 & Fyield & bbb1 = 0.05 for 10% assumed damp). However I got a convergence problem when my Keff = 100000 kips/in ( Fyield1 897, K001 1670796,bbb1 0.05), when my Keff less than 30000 kips/in ( Fyield1 867, K001 501239,bbb1 0.05) the model run fine. Can you tell me how to overcome this? Here is my model and the ground motion:

wipe

set datadir test
file mkdir $datadir


wipe
# Build Model
set g 386.4

set filePath2 {"CAPEMENDOCINO_CPM_UP.txt" }
set dt2 { 0.02 }
set GMname {1 }

foreach filePath2 $filePath2 dt2 $dt2 GMname $GMname {
wipe


# Define the model builder

model BasicBuilder -ndm 2 -ndf 3


set g 386.4


# Set some variables

set L 120

set A 20

set E [expr 10e12]

set I 1400

set M 10


# Define nodes

node 1 0.0 0.0

node 2 0.0 0.0 -mass $M $M 0

node 3 $L 0.0


# Define single point constraints

fix 1 1 1 1

fix 3 1 0 1


# Define force-deformation relationship for spring

set Fyield1 897
set K001 1670796
set bbb1 0.05
uniaxialMaterial Steel02 1 $Fyield1 $K001 $bbb1 20 0.925 0.15; # uniaxialmaterial


# id ndI ndJ mats dirs

element zeroLength 1 1 2 -mat 1 -dir 2


# Geometric transformation

geomTransf Linear 1


# id ndI ndJ A E I transf

element elasticBeamColumn 2 2 3 $A $E $I 1


# tag dir factor fileName deltaT



timeSeries Path 2 -dt $dt2 -filePath $filePath2 -factor $g


pattern UniformExcitation 2 2 -accel 2


recorder Node -file $datadir/Vdisp$GMname.out -time -node 2 -dof 2 disp
recorder Node -file $datadir/Vaccelabsolute$GMname.out -timeSeries 2 -time -node 2 -dof 2 accel
recorder Element -file $datadir/Vload$GMname.out -time -ele 1 force


integrator Newmark 0.5 0.25
test EnergyIncr 1.0e-6 10
algorithm Newton
numberer Plain
constraints Transformation 1.0
system SparseGeneral
analysis Transient


analyze 3000 0.01

}


GM:


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[vesna]

Try to do the analysis in a while loop as in this example:http://opensees.berkeley.edu/wiki/index ... e_Analysis

[khunglongkhelua]

Thanks vesna, I tried but it still didn't converge. When I modeled the spring as linear the model works well, do you think the problem comes from the steel02 material.

[vesna]

Can you show me the message you get for the cases your Steel02 is not working?