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Excuse me Sir, I've tried to download the Tcl/tk file which is needed for running parallel CPUs But i've Got 403 forbidden Error. What's wrong with it ?

Thanks a lot

Thanks a lot SK
You mean after defining the radiation damping by putting two dampers in sway and rocking DOFs, Then I should define 5% rayleigh damping for the total system ( Structure plus soil ) ?

Hi
Dear all
I wrote a code for getting responses of a Soil-Structure system.I used Tabas strong ground motion record in X direction to analyze my system.But I got response from node 2 (Foundation) in Y direction. I don't know why it happens. Can anyone help me?
Regards
My code is :


wipe
model basic -ndm 2 -ndf 3
node 1 0. 0.
node 2 0. 0.
node 3 0. 0.
node 4 0. 0.
node 5 0. $h
fix 3 1 1 1
fix 1 0 1 1
equalDOF 2 4 1 2
equalDOF 2 1 1
mass 2 $mf 1.e-25 $If
mass 5 $ms 1.e-20 0.
uniaxialMaterial Elastic 1 $kh
uniaxialMaterial Elastic 2 $kr
uniaxialMaterial ElasticPP 3 [expr $ke*pow($h,2)] $epr
uniaxialMaterial Viscous 4 $ch 1.0
uniaxialMaterial Viscous 5 $cr 1.0
element zeroLength 1 2 3 -mat 1 -dir 1 -doRayleigh 1
element zeroLength 2 1 2 -mat 2 -dir 6 -doRayleigh 1
element zeroLength 3 2 4 -mat 3 -dir 6 -doRayleigh 1
element zeroLength 4 2 3 -mat 4 -dir 1
element zeroLength 5 1 2 -mat 5 -dir 6
geomTransf Linear 1
element elasticBeamColumn 6 4 5 1.e6 2.e11 1.e6 1
equalDOF 4 5 3
set xDamp $kesai
set nEigenI 1
set nEigenJ 2
set lambdaN [eigen $nEigenJ]
set lambdaI [lindex $lambdaN [expr $nEigenI-1]]
set lambdaJ [lindex $lambdaN [expr $nEigenJ-1]]
set omegaI [expr pow($lambdaI,0.5)]
set omegaJ [expr pow($lambdaJ,0.5)]
set alphaM [expr $xDamp*(2*$omegaI*$omegaJ)/($omegaI+$omegaJ)]
set betaKcomm [expr 2.*$xDamp/($omegaI+$omegaJ)]
rayleigh $alphaM 0.0 $betaKcomm 0.0
set accel "Series -dt 0.001 -filePath tabasdt0.001.txt -factor 9.81"
pattern UniformExcitation 3 1 -accel $accel
set dt 0.001
constraints Transformation
numberer RCM
system BandGeneral
test EnergyIncr 1.0e-6 20
algorithm Newton
integrator Newmark 0.5 0.25
analysis Transient
analyze [expr int(32.82/$dt)] $dt

Hi

I've wrote a code for building a soil-structure system.I want to set 5% damping for structure and 5% material damping for soil. I modeled structure's damping by a damper in my structure and I've modeled radiation damping of soil, by using two dampers with special coefficients that read in the articles in sway and rocking degrees of freedom.But, As you know, soil has both material and radiation damping. I don't know how can I set 5% material damping to the soil. I'll appreciate it if you help me.

Regards
----------------------------------------------------------
Aidin Tamhidi
M.Sc. Student - Structural Engineering
Department of Civil Engineering
Sharif University of Technology