The file in the manual returns zero force of viscous element

[AbRiahi]

Dear all
I used the file matTest.tcl in the opensees manual to obtain a force-displacement response of a viscous element.
But the results are zero force for the case. Can anyone help to tackle this problem?
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Here is the code:
# matTest.tcl: SDOF truss to test uniaxial material models
# Units: kip, in
# MHS, Sept 1999
# email: mhscott@ce.berkeley.edu
model BasicBuilder -ndm 1 -ndf 1
file mkdir data; # create data directory
# Define nodes
node 1 0.0
node 2 1.0
# Fix node 1
fix 1 1
# Define uniaxialMaterial

# Defining viscouse material
set matTag_Viscous 1;
set C 1.0;
set alpha 0.1;
uniaxialMaterial Viscous $matTag_Viscous $C $alpha
# Define truss element with unit area
## tag ndI ndJ A matTag
element truss 1 1 2 1.0 $matTag_Viscous
set dt 0.02 ;# Increment between data points
set filename pattern1.txt ;# Filename containing data points
set factor 1.00 ;# Factor applied to data values
# Read displacement pattern from file
# Note, any pattern type can be used here: Linear, Path, Sine, etc.
pattern Plain 1 "Series -dt $dt -filePath $filename -factor $factor" {
# Set reference displacement value
# node dof value
sp 2 1 1.0
}
# Impose monotonic displacements
#pattern Plain 2 "Linear -factor $factor" {
# sp 2 1 1.0
#}
# Record nodal displacements (same as strains since truss length is 1.0)
recorder Node -file Data/DFree.out -time -node 2 -dof 1 disp;
recorder Node -file Data/RBase.out -time -node 1 -dof 1 reaction;
recorder Element -file Data/ele1local.out -time -ele 1 localForce


#recorder Node-file Data/DFree.out truss.out disp -load -node 2 -dof 1
## Record truss force (same as stress since truss area is 1.0)
#recorder Element 1-file Data/DFree.out -time -file force.out force
system UmfPack
constraints Penalty 1.0e12 1.0e12

# Set increment in load factor used for integration
# Does not have to be the same as dt used to read in displacement pattern
set dl $dt
integrator LoadControl $dl 1 $dl $dl
test NormDispIncr 1.0e-6 10
algorithm Newton
#system UmfPack
numberer RCM
analysis Static
analyze 10000
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Here is the file "pattern1.txt" for the displacement of the free end
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[vesna]

Based on the experience of users that tested viscose material it works well only for alpha greater than 0.5. Try this and see if it is going to help you solve your problem.

[AbRiahi]

Dear vesna
I modified the code and managed to get results for the case alpha=1 and harmonic excitation, but I obtained an unexpected result for the hysteretic loop( I mean some fluctuations in the oval shape).
Would you mind please give me your e-mail adress so that I send you the code and the obtained result?

[vesna]

It may be that the material is having a bug. As I am not a developer of the material I can not help you with regard to this.

Did you look at Maxwell material (http://opensees.berkeley.edu/wiki/index ... l_Material) to see if you can use it instead?