ReverseCyclic and ground motion analysis of cantilvercolumn

[Cathy]

hello everyone! I am a graduate and a greenhand of OS. Thanks in advance!
I want to do Reverse Cyclic Lateral Load Analysis and damage of cantilever column.

Reverse Cyclic Lateral Load Analysis script is:
wipe
source gravityloads.tcl
pattern Plain 2 "Linear" {
load 2 200 0.0 0.0
}

uniaxialMaterial Pinching4 4 300 0.02 400 0.1 311 0.135 171 0.135 -300 -0.02 -400 -0.1 -311 -0.135 -171 -0.135 0.5 0.25 0.05 -0.5 -0.25 -0.05 1.0 0.2 0.3 0.2 0.9 0.5 0.5 2.0 2.0 0.5 1.0 0.0 1.0 1.0 0.9 10 energy

recorder Node -file RCyclicPinchR.out -load -node 2 -dof 1 disp

# build the components for the analysis object

system SparseGeneral -piv;

constraints Plain

test NormUnbalance 1.0e-9 10

algorithm Newton

numberer Plain

## analysis type used in the procedure is Static

set peakpts [list 0.02 0.025 0.03 0.05 0.07 0.1 0.14 ]

set increments 10

set nodeTag 2

set dofTag 1


# print the results at nodes

print Node

the experiment date of this Reverse Cyclic Lateral Load is
3176
0 0
0.143 -1.532
0.143 -1.67
0.024 -0.95
0.024 -1.088
0.024 -1.364
0.019 -1.501
0.024 -1.532
0.028 -2.022
0.033 -1.992
0.047 -2.145
0.052 -2.267
0.043 -2.666
0.057 -2.834
0.09 -2.712
0.086 -2.513
0.081 -2.497
0.076 -2.405
0.552 24.087
1.005 44.427
1.462 64.437
1.633 71.617
1.205 50.127
0.743 28.207
0.367 8.317
-0.062 -12.7
-0.443 -32.173
-0.872 -52.333
-1.205 -66.743
-0.838 -46.053
-0.443 -24.863
-0.029 -5.3926
...-2.9195 39.077
-0.915 39.907
0.057 39.417
0.071 39.237

question 1:the RCyclicPinchR out is blank,how can i do ?
question 2:I want to get the damage of cantilever column after strong earthquake, how to define recorder ? is there anything that i need do?[/list][/quote][/url][/i][/b]

[silvia]

please look at the examples and user manuals for reversed cyclic loading and for recorders.
i think there is something about if the input is from a file.

[Cathy]

thank you silvia! now i have two question
1. in the RCyclicPinch.tcl ,how to get the parameter for example rDisp ,uForce,gammaK1 gammaK2 gammaK3 gammaK4 gammaKLimit ,gammaD1 gammaD2 gammaD3 gammaD4 gammaDLimit ?

##### Ratio of maximum deformation at which reloading begins
### Pos_env. Neg_env.
set rDisp [list 0.5 0.5]

##### Ratio of envelope force (corresponding to maximum deformation) at which reloading begins
### Pos_env. Neg_env.
set rForce [list 0.25 0.25]

##### Ratio of monotonic strength developed upon unloading
### Pos_env. Neg_env.
set uForce [list 0.05 0.05]

##### Coefficients for Unloading Stiffness degradation
### gammaK1 gammaK2 gammaK3 gammaK4 gammaKLimit
#set gammaK [list 1.0 0.2 0.3 0.2 0.9]
set gammaK [list 0.0 0.0 0.0 0.0 0.0]

##### Coefficients for Reloading Stiffness degradation

### gammaD1 gammaD2 gammaD3 gammaD4 gammaDLimit
#set gammaD [list 0.5 0.5 2.0 2.0 0.5]
set gammaD [list 0.0 0.0 0.0 0.0 0.0]


2. I want to get the damage of the ground motion analysis of cantilver column, how can i get the damage? now i don't find suitable example,please give me detailed examplation or suitable example.
when defining Recorder Objects , which one i should choose? Recorder Objects :Node Recorder;EnvelopeNode Recorder;Drift Recorder;Element Recorder;EnvelopeElement Recorder;Display Recorder;Plot Recorder;playback Command;

[silvia]

look at the user and examples manual for the recorders.

for the data on the pinching, you should contact the material author, as i don't have much experience with it.
also, you have to calculate damage in post-processing.

[Cathy]

Thanks silvia!
If i calculate damage in post-processing,should i use OSP - The OpenSees Graphical Post Processor ?
If i want to get hysteretic curves,should i define two ecorder command in the Reverse Cyclic Lateral Load Analysis ? the two ecorder command are :
recorder Node -file RCyclic.out -time -node 2 -dof 1 2 disp
recorder Element -file Element1.out -time -ele 1 force
is hysteretic curves made up of the datas from the two out files?

[silvia]

i don't know if osp has been updated to be compatible with the latest version of opensees.
for the hysteretics, it depens on what you are looking for in the model.