Question regarding Pushover Analysis

[Ella]

Hi there,
I have a 6-story 3D model and want to perform a LOAD-CONTROL pushover analysis on it. However, I have 3 questions (problems actually) and would be grateful if you could help.
1)although I have defined 100 steps for my analysis (analyze 100), opensees only analyzes my model for 64 steps (I got only 64 rows in my output files).
2)when I record node reactions (for finding base shear), some nodes give positive reactions! (in direction of push).
3)even if I push the roof for about 1 meter, there is no diving in capacity curve, it goes up and up!
I would be thankful if you could tell me what the problem might be. here is my code for pushover analysis:

recorder Node -file BaseShear.OUT -nodeRange 10 40 -dof 1 reaction
recorder Node -file RoofDisplacement.OUT -node 6 -dof 1 disp

pattern Plain 2 Linear {

load 6 1.000 0.0 0.0 0.0 0.0 0.0
load 5 0.830 0.0 0.0 0.0 0.0 0.0
load 4 0.664 0.0 0.0 0.0 0.0 0.0
load 3 0.498 0.0 0.0 0.0 0.0 0.0
load 2 0.332 0.0 0.0 0.0 0.0 0.0
load 1 0.166 0.0 0.0 0.0 0.0 0.0
}

constraints Lagrange;
numberer RCM;
system UmfPack;
test EnergyIncr 1.E-8 6;
algorithm Newton;
integrator LoadControl 1000;
analysis Static;
analyze 100;

I appreciate your tolerance.

[fmk]

1. does OpenSees fail at step 65 or does evrything work and you only get 64 lines of output.
2. you can do 2 thnings:
1.check the rections at a node with element forces for the column coming into the node ..
2. check overall global equilibrium of structure (applied loads versus reactions)
3. that is a function of your particular model.

[Ella]

Dear Dr. McKenna,
Thank you so much for your reply, It was really deriving me mad! and I'm really happy to have your support.
1-No problem at all. Everything works perfect but I get 64 lines of output.
2-As you said, I checked the overall equilibrium and it's OK, but the question is that why do I get logical node reaction response while performing DISPLACEMENT_CONTROL pushover analysis (all components are negative and in contrast to the direction of applied load), whereas performing LOAD-CONTROL pushover analysis results in some positive node reactions which are in the same direction to the applied load. And i think that it cannot be correct. It should be noted, however, the capacity curves obtained from load-control and disp-control pushover analysis are exactly the same!
Thanks a lot for your patience...