Push over analysis doesn't converge!

[amirmassoud]

Hi everybody ...
My model is a 3D reinforced concrete structure.
It contains 3 stories.
Elements are defined as fiber sections and modeled with dispBeamColumn elements.
But push over analysis doesn't converge.
Help me if possible ...
# --------------------
# Push over analysis
# --------------------
pattern Plain 2 "Linear" {;
# --------------------
# Node ID FX FY MZ
# --------------------
load 131 1.00 0.00 0.00 0.00 0.00 0.00
load 98 0.667 0.00 0.00 0.00 0.00 0.00
load 65 0.333 0.00 0.00 0.00 0.00 0.00
};
# --------------------
# Displacement increment
# --------------------
set dU 0.01 ;
integrator DisplacementControl 131 1 $dU ;
system UmfPack ;
constraints Transformation ;
test EnergyIncr 1.00e-5 200 1 ;
algorithm ModifiedNewton ;
numberer RCM ;
# --------------------
# Max displacement
# --------------------
set maxU 0.6 ;
set numSteps [expr int($maxU/$dU)] ;
analyze $numSteps ;
# --------------------
puts " Pushover analysis performed successfully ..."
# --------------------

[fmk]

do something in the script if the analysis fails
http://opensees.berkeley.edu/wiki/index ... r_Analysis