How to improve the convergence of dynamic analysis of SDOF?

[ismailqeshta]

Hi,

I am running a dynamic (time-history) analysis of a single degree of freedom (SDOF) model using distributed plasticity (dispBeamColumn element).

I am using the below code to run my analysis. I tried to improve the convergence by using the different alternative algorithms of the analysis code of example 7 (Portal frame EQ distributed), but it did not improve it.

Can anyone please check my code below, and if possible, give me any suggestion on how to improve the convergence?



# 2. Analysis
# System of equations
system BandGeneral
#system FullGeneral
numberer Plain
# Constraint handler
constraints Transformation
# Convergence test
test NormDispIncr 1.0e-6 100
# Integrator
integrator LoadControl 0.1
# Solution algorithm
algorithm Newton
# Analysis object
analysis Static

for {set i 1} {$i < $NumSteps} {incr i} {

set ok [analyze 1 $dt_analysis]

set ok 0; break;
}
if {$ok != 0} {