I am a tyro with OpenSees and was trying to run an eigenanalysis with the Example 1 problem given for thermal analysis (simply supported beam). Unfortunately, some error is coming while running the code. Can anyone kindly help me with this? Is it something that I am doing wrong or is it something else?
Thanks,
Adarsh
The code and the error messages are given below.
Code:
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##########################################################################################
# Code by Walker Maddalozzo & Dr. Erica Fischer - Oregon State University - April 2019
# Example: simple beam with thermal expansion
# Units: Newtons, mm, seconds
wipe all; # clear memory of past model definitions
model BasicBuilder -ndm 2 -ndf 3; # Define the model builder, ndm = #dimension, ndf = #dofs
#source DisplayModel2D.tcl; # procedure for displaying a 2D perspective of model
#source DisplayPlane.tcl; # procedure for displaying a plane in a model
set dataDir Examples/Example1_OUTPUT; # name of output folder
file mkdir $dataDir; # create output folder
#------------------------------------------------------------------------------
# Geometric model
# ________
# | | | 4 fibers in section
# 1 |------------------------|2 |____|____| 0.4m
# |<----------1m---------->| | | |
# |____|____|
# 0.2m
#------------------------------------------------------------------------------
###################################################################################################
# Define Geometry, Nodes, Masses, and Constraints
###################################################################################################
###################################### NODE DEFINITIONS ###########################################
# http://opensees.berkeley.edu/wiki/index ... de_command
# node nodetag locx locy
node 1 0 0;
node 2 1000 0;
###################################### MASS DEFINITIONS ###########################################
mass 1 314. 314. 0. ;
mass 2 314. 314. 0.;
###################################### BOUNDRY CONDITIONS #########################################
# http://opensees.berkeley.edu/wiki/index.php/Fix_command
#fix nodetag dofx dofy dof moment about z [ 1 = fixed 0 = free ];
#Left end fixed - right end roller to allow expansion.
fix 1 1 1 0; #pinned
fix 2 0 1 0; #roller
##################################### MATERIAL DEFINITIONS ########################################
set Es 210000; #Mpa # steel Young's modulus;
set Fy 250; #MPa # steel yield strength;
set b 0.001; # strain-hardening ratio;
#uniaxialMaterial Steel01Thermal $matTag $Fy $E0 $b
uniaxialMaterial Steel01Thermal 1 $Fy $Es $b;
##################################### TRANSFORMATION DEFINITIONS ############################
# http://opensees.berkeley.edu/wiki/index ... on_Command
#three transformation types can be chosen: Linear, PDelta, Corotational
# transforamtion: geomTransf $type $TransfTag;
set transftag 1
geomTransf Linear $transftag;
###################################### ELEMENT GEOMETRY ############################################
# PATCH COMMAND: http://opensees.berkeley.edu/wiki/index ... ch_Command
section FiberThermal 1 -GJ $Es {
set numSubdivIJ 2; # horizontal
set numSubdivJK 2; # vertical
set yI -100;
set zI -200;
set yJ 100;
set zJ -200;
set yK 100;
set zK 200;
set yL -100;
set zL 200;
patch quad 1 $numSubdivIJ $numSubdivJK $yI $zI $yJ $zJ $yK $zK $yL $zL
}
###################################### ELEMENT PROPERTIES ###########################################
#dispBeamColumnThermal $eleTag $iNode $jNode $numIntgrPts $secTag $TransfTag;
element dispBeamColumnThermal 1 1 2 5 1 $transftag;
###################################### RECORDER OUTPUTS #############################################
# http://opensees.berkeley.edu/wiki/index ... er_Command
recorder Node -file $dataDir/Node2disp.out -time -node 2 -dof 1 disp; # displacements of end node (2) DOF 1 Horizontal Direction
###################################### THERMAL LOADS ###############################################
# Defining temperature data for two extreme locations. The temperature will be linearly interpolated between the two locations.
set T 1180.; #Max Temp - DEG CELCIUS
set Y1 200.; #top fiber of beam
set Y2 -200.; #Bottom fiber of beam
#pattern Plain $PatternTag Linear { eleLoad -ele $eleTag -type -beamThermal $MaxTemp $ExtremeFiberLoc1 $MaxTemp $ExtremeFiberLoc2 };
pattern Plain 1 Linear { eleLoad -ele 1 -type -beamThermal $T $Y2 $T $Y1 };
###################################### EIGEN ANALYSIS ###############################################
eigen 1
set Nstep 1000;
set Factor [expr 1.0/$Nstep];
constraints Plain;
numberer Plain;
system BandGeneral;
test NormDispIncr 1e-12 500;
algorithm Newton;
integrator LoadControl $Factor;
analysis Static;
analyze $Nstep;
puts "Fire Done. End Time: [getTime]"
wipe;
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OUTPUT/ERROR MESSAGE:
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Steel01Th unaxial material - Modified by Princeton
ArpackSolver::Error with _saupd info = -9999
Could not build an Arnoldi factorization.IPARAM(5) the size of the current Arnoldi factorization: is 1factorization. The user is advised to check thatenough workspace and array storage has been allocated.
WARNING DirectIntegrationAnalysis::eigen() - EigenSOE failed in solve()
WARNING: analysis .. existing TransientAnalysis exists => wipeAnalysis not invoked, problems may arise
Fire Done. End Time: 1.000000
> End of file [ "C:\Users\CHIKKU-ADI\Desktop\OpenSees _Thermal\OwnThermal_1D_Beam\OwnThermal_1D_Beam.tcl" ] reached.
> Elapssed time: 00:00:000.0681 (h
s:ms)> Sunday, April 10, 2022 5:39:57 PM
> Press any key to close, right click for options.
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