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Thanks Silvia, that's what I thought too. Displacements were input in inch then outputs should be in inch too. Now, when I run your script with the load of 8382.1 lbf, I got the disp. of 12.36inch (the number in the file is 12.36, assuming it is in inch). So this result is totally wrong because in m...

it's not in ft either. The unit seems to be 1/12 of an inch, because when I devide the number in the output file by 12, I got the correct answer in inch. Could you please explain this for me. Thanks a lot!

Hi silvia, Sorry for my silly question. But if I divide my number by 12 I got resonable result so is the unit in the output file in ft. I input everything in inch and in the LibUnits.tcl, the basic and output unit for disp. is in inch. When I use the command put, I got the the number on the screen i...

Hi Silvia, Thank you for your help. I tried to do it either ways. Both of my original code and the one modified as you instructed gave the same result, that was when the vertical load was 2884.9 lbf the displacement was 1.2in. I defined my first point of hysteretic curve as 2884.9lbs and 0.1in. Ther...

Hi Silvia and all, I made a very simple model to verify the hysteretic material model in OpenSees. The model had only one element which was truss element. I used OpenSees uniaxial hysteretic material with parameters from my FE analysis results. The model was running without errors. But the results d...

have you compared a static analysis first? Hi Silvia, Yes, I applied 100kips horizontaly on both model and I got the same reactions. But when I run time history analysis, the reaction plots are identical, but the value is different. I read in this thread that reactions in OpenSees including inertia...

silvia wrote:have you compared a static analysis first?

Hi Silvia,

Yes, I applied 100kips horizontaly on both model and I got the same reactions. But when I run time history analysis, the reaction plots are identical, but the value is different.

fmk wrote:is there damping in your model?

No, I am trying no damping first.

Hi Silvia and all, I do a time history analysis for my strucuture in OpenSees and SAP2000 and compare the results. Displacements and accelerations are in very good agreement. But reactions do not match at all. Difference is like 30%. Do you have any idea about this? What can be wrong? Are the reacti...