Run Time History and Pushover analysis

[elena girardi]

I have a problem: I can't write a program wich is able to run a Time History analysis and, after, a Pushover. The file filePath A10000.acc is the same I've found in the Examples Manual. The model built is the same for the analysis.
Here the tcl I've written:

#"Time history analysis"

wipe;

model BasicBuilder -ndm 2 -ndf 3;

#Definisco i due nodi d'estremità, con altezza della pila 10 m
node 1 0 0;
node 2 0 10000;


#Condizioni divincolo: incastro al nodo 1
fix 1 1 1 1;

# nodal masses:
mass 2 5.18 1.e-9 0.; # node#, Mx My Mz, Mass=Weight/g.

# definizione dei materiali
uniaxialMaterial ElasticPP 1 32e3 0.00175;

#Sezione circolare, d=1000 mm
# Circular Patch command
section fiberSec 10 {
patch circ 1 12 4 0.0 0.0 0.0 500 0 360
}

geomTransf PDelta 1

set NGauss 4;

element nonlinearBeamColumn 1 1 2 $NGauss 10 1 ;



# define GRAVITY -------------------------------------------------------------
timeSeries Linear 1
pattern Plain 1 1 {
load 2 0. -1e6 0.; # node#, FX FY MZ -- superstructure-weight
}
constraints Plain; # how it handles boundary conditions
numberer Plain; # renumber dof's to minimize band-width (optimization), if you want to
system BandGeneral; # how to store and solve the system of equations in the analysis
algorithm Linear; # use Linear algorithm for linear analysis
integrator LoadControl 0.1; # determine the next time step for an analysis, # apply gravity in 10 steps
analysis Static # define type of analysis static or transient
analyze 10; # perform gravity analysis
loadConst -time 0.0; # hold gravity constant and restart time

# DYNAMIC ground-motion analysis -------------------------------------------------------------
# create load pattern

set G 9810

timeSeries Path 2 -dt 0.005 -filePath A10000.acc $G;

pattern UniformExcitation 2 1 -accel 2;

set freq [expr [eigen 1]**0.5];
set dampRatio 0.02;
rayleigh 0. 0. 0. [expr 2*$dampRatio/$freq];

wipeAnalysis;

constraints Plain;
numberer Plain;
system BandGeneral;
algorithm Linear;

integrator Newmark 0.5 0.25;
analysis Transient;

analyze 3995 0.01;

puts "Done TH!"

This have no problem, then I try to run the following (without "wipe" command):

# RECORDER--------------------------------------------------------------------------------------------------

recorder Node -file RBase.txt -time -node 1 -dof 1 2 3 reaction; # support reaction

recorder Node -file Disp2.txt -time -node 2 -dof 1 2 3 disp; # dx,dy,rz nodo2

# Carico laterale push over F= 1e3 N -------------------------------------------------------------
# Lateral load pattern
pattern Plain 3 Linear {
load 2 1000 0 0 ;
}

# pushover: diplacement controlled static analysis
# Spostamento di 1 mm per 1000 step; spost totale D=500 mm
integrator DisplacementControl 2 1 1;
analyze 500;

puts "Done PO!"

But the program says me that there are problems with "Transient analysis".

If anyone could help me. Thank you.

[fmk]

you need to issue a "wipeAnalysis" command after the dynamic analysis and then build a static analysis for the pushover.

there is no space between wipe and Analysis, it's all one word.

[elena girardi]

But I want to compare the Pushover analysis (Pushover Curve) before and after the Time History analysis, I want to conserve the results of the Time history and run the Pushover to obtain new and lower results. It is possible?

[silvia]

i believe the wipeAnalysis only removes the analysis parameters, not the results and status

[andrett7]

Hi Elena,

did you solve the problem?. I am also interested in comparing the performance of a structure before an earthquake (with a pushover analysis) and after that (time history and a subsequent pushover). Now I'll try to solve the problem. However, let me know; maybe we can compare the methods we implemented (I hope).

See you,

Andrea

[andrett7]

Hi Elena,

I tried an example (on a simple cantilever beam) and it works.
At the end of the tcl file with the specifications of time history analysis just put wipeAnalysis, and after that you can run a pushover analysis. In your output you will see first the results of TH and then those related to the static analysis.

Andrea