Can anybody help me to check this example?

[Rocky]

The first five steps work fine.
But after six steps, I checked the displacement of Node 3, and found it's zero. I don't know why. Can anybody help me?

Thanks alot.



model basic -ndm 2 -ndf 3
node 1 0.0 0.0
node 2 0.0 3.0
node 3 0.0 4.5
fix 1 1 1 1
fix 2 0 1 1
fix 3 0 1 0
mass 2 100000.0 0.0 0.0
geomTransf Linear 1
element elasticBeamColumn 1 1 2 1.0 30000000.0 3.0 1
element elasticBeamColumn 2 2 3 1.0 30000000.0 3.0 1
recorder Node -file _insideSub.txt -node 2 -dof 1 disp

set dispSeries "Series -time {0.01 0.02 0.03 0.04 0.05 0.06} -values {-5.9703e-5 -1.3216e-4 1.0867e-4 8.1344e-4 1.4789e-3 2.00e-3} -factor 1.0"
pattern MultipleSupport 1 {
groundMotion 1 Plain -disp $dispSeries
imposedMotion 3 1 1
}


recorder Node -file Sub1_1_0.out -node 3 -dof 1 reactionIncludingInertia
set gaccel "Series -time {0.01 0.02 0.03 0.04 0.05 0.06} -values {2.4 -4.24 -6.41 -1.68 10.7 17.6} -factor 1.0"
pattern UniformExcitation 2 1 -accel $gaccel
#rayleigh 0.2 0.0 0.001 0.0
constraints Transformation
numberer RCM
system SparseGeneral -piv
test EnergyIncr 1.0e-12 100 3
algorithm Newton
integrator Newmark 0.5 0.25
analysis Transient
analyze 6 0.01

[Rocky]

If only analyzing five steps (0-0.05), the result of reaction force on node 3 is correct. But if analyzing six steps (0-0.06), the reaction force on node 3 is not correct, and the displacement on this node is not the displacement assigned to it.

Can anybody check it? or is my syntax incorrect?

Thanks alot.