78 lines
3.5 KiB
Text
78 lines
3.5 KiB
Text
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# --------------------------------------------------------------------------------------------------
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# Example4. 2D Portal Frame-- Dynamic sine-wave input analysis
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# Silvia Mazzoni, 2006
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# execute this file after you have built the model, and after you apply gravity
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#
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# Uniform Sine-Wave ground motion (uniform acceleration input at all support nodes)
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set GMdirection 1; # ground-motion direction
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set GMSineAccAmpl [expr 0.5*$g]; # sine ground-motion acceleration amplitude (this is the support motion, not the free-node motion)
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set TPeriodSine [expr 0.35*$sec]; # period of input sine wave
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set DurationSine [expr 3.*$sec]; # duration of input sine wave
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# set up ground-motion-analysis parameters
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set DtAnalysis [expr 0.01*$sec]; # time-step Dt for lateral analysis
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set TmaxAnalysis [expr 10. *$sec]; # maximum duration of ground-motion analysis -- should be 50*$sec
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# ----------- set up analysis parameters
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source LibAnalysisDynamicParameters.tcl; # constraintsHandler,DOFnumberer,system-ofequations,convergenceTest,solutionAlgorithm,integrator
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# define DAMPING--------------------------------------------------------------------------------------
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# apply Rayleigh DAMPING from $xDamp
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# D=$alphaM*M + $betaKcurr*Kcurrent + $betaKcomm*KlastCommit + $beatKinit*$Kinitial
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set xDamp 0.02; # 2% damping ratio
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set lambda [eigen 1]; # eigenvalue mode 1
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set omega [expr pow($lambda,0.5)];
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set alphaM 0.; # M-prop. damping; D = alphaM*M
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set betaKcurr 0.; # K-proportional damping; +beatKcurr*KCurrent
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set betaKcomm [expr 2.*$xDamp/($omega)]; # K-prop. damping parameter; +betaKcomm*KlastCommitt
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set betaKinit 0.; # initial-stiffness proportional damping +beatKinit*Kini
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rayleigh $alphaM $betaKcurr $betaKinit $betaKcomm; # RAYLEIGH damping
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# --------------------------------- perform Dynamic Ground-Motion Analysis
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# the following commands are unique to the Sine-Wave excitation
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set IDloadTag 400; # for uniformSupport excitation
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set DtGround [expr 0.005*$sec]; # time-step Dt for input grond motion
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set omegaSine [expr 2*$PI/$TPeriodSine];
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set vel0 [expr $GMSineAccAmpl*(-1)/$omegaSine];
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set AccelSeries "Sine 0. $DurationSine $TPeriodSine -factor $GMSineAccAmpl "
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pattern UniformExcitation $IDloadTag $GMdirection -accel $AccelSeries -vel0 $vel0
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set Nsteps [expr int($TmaxAnalysis/$DtAnalysis)];
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set ok [analyze $Nsteps $DtAnalysis]; # actually perform analysis; returns ok=0 if analysis was successful
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if {$ok != 0} { ; # analysis was not successful.
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# --------------------------------------------------------------------------------------------------
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# change some analysis parameters to achieve convergence
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# performance is slower inside this loop
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# Time-controlled analysis
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set ok 0;
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set controlTime [getTime];
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while {$controlTime < $TmaxAnalysis && $ok == 0} {
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set controlTime [getTime]
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set ok [analyze 1 $DtAnalysis]
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if {$ok != 0} {
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puts "Trying Newton with Initial Tangent .."
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test NormDispIncr $Tol 1000 0
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algorithm Newton -initial
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set ok [analyze 1 $DtAnalysis]
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test $testTypeDynamic $TolDynamic $maxNumIterDynamic 0
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algorithm $algorithmTypeDynamic
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}
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if {$ok != 0} {
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puts "Trying Broyden .."
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algorithm Broyden 8
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set ok [analyze 1 $DtAnalysis]
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algorithm $algorithmTypeDynamic
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}
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if {$ok != 0} {
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puts "Trying NewtonWithLineSearch .."
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algorithm NewtonLineSearch .8
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set ok [analyze 1 $DtAnalysis]
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algorithm $algorithmTypeDynamic
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}
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}
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}; # end if ok !0
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puts "Ground Motion Done. End Time: [getTime]"
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