Search found 52 matches

by luckypants
Fri Mar 19, 2021 1:57 pm
Forum: OpenSees Sequential
Topic: Incorrect result when using fixed number of iterations command
Replies: 9
Views: 332

Re: Incorrect result when using fixed number of iterations command

Dear STKO Team: Thank you for your reply. But I want to do hybrid simulation, I should use explicit method or implicit integration method with fixed number of iterations. Then, Newmark method is implicit method. So, is it possible to use explicit method or implicit integration method with fixed numb...
by luckypants
Fri Mar 19, 2021 8:51 am
Forum: OpenSees Sequential
Topic: Incorrect result when using fixed number of iterations command
Replies: 9
Views: 332

Re: Incorrect result when using fixed number of iterations command

Dear Clarabella:

I completed the analysis in STKO. Here are the result.

Then, the attachments are my models (.scd).

Regards
by luckypants
Thu Mar 18, 2021 9:20 am
Forum: OpenSees Sequential
Topic: Incorrect result when using fixed number of iterations command
Replies: 9
Views: 332

Re: Incorrect result when using fixed number of iterations command

Dear Clarabella:

Thank you for your advice. :) :)

I change my model to the simple cantilever column. The time step of the ground motion is 0.005 sec.

I use the same analyses command. The result is wrong.

The attachment is my model (scd file) and TCL file.

Best Regards
by luckypants
Wed Mar 17, 2021 4:39 pm
Forum: OpenSees Sequential
Topic: Incorrect result when using fixed number of iterations command
Replies: 9
Views: 332

Re: Incorrect result when using fixed number of iterations command

Dear Clarabella: Thank you for your advice. :) :) I change the time step of the ground motion 0.02 sec to 0.001953 sec, but the result is still wrong. How could I solve the problem? The following is the analyses command. constraints Transformation numberer RCM system BandGeneral test FixedNumIter 10...
by luckypants
Wed Mar 17, 2021 7:58 am
Forum: OpenSees Sequential
Topic: Incorrect result when using fixed number of iterations command
Replies: 9
Views: 332

Incorrect result when using fixed number of iterations command

Dear STKO Team: I want to do the hybrid simulation, but implicit integration methods are not suitable for hybrid simulation. Therefore, I try to analyze seven story nonlinear model by using explicit integration methods or implicit integration method with fixed number of iterations. After the analysi...
by luckypants
Fri Feb 26, 2021 6:53 am
Forum: OpenSees Sequential
Topic: How to consider the rotational mass in linear elastic static analysis?
Replies: 24
Views: 1477

Re: How to consider the rotational mass in linear elastic static analysis?

Dear AcetoDivino: Thank you very much. :D :D :D The problem is solved. I originally set the multipliers of the shear areas and the torsional constant to 0. So I changed the torsional constant to 1. After I completed the analysis, the results of displacement vs time was almost same and the periods of...
by luckypants
Wed Feb 24, 2021 1:40 pm
Forum: OpenSees Sequential
Topic: How to consider the rotational mass in linear elastic static analysis?
Replies: 24
Views: 1477

Re: How to consider the rotational mass in linear elastic static analysis?

Dear AcetoDivino:

I removed the membranes in ETABS and compare ETABS to STKO. The result was still different.

Here is the ETABS output of the time vs displacement.

Best Regards
by luckypants
Sat Feb 20, 2021 11:09 am
Forum: OpenSees Sequential
Topic: How to consider the rotational mass in linear elastic static analysis?
Replies: 24
Views: 1477

Re: How to consider the rotational mass in linear elastic static analysis?

Dear AcetoDivino: Thank you for your advices. I can't convert it to SAP2000, because I don't have SAP2000. (The user must have both ETABS and SAP2000 installed on the same system) To simplify the comparison, I deleted the shear wall. Then, I did the analysis again and compare ETABS to STKO. There we...
by luckypants
Fri Nov 27, 2020 4:41 am
Forum: OpenSees Sequential
Topic: How to consider the rotational mass in linear elastic static analysis?
Replies: 24
Views: 1477

Re: How to consider the rotational mass in linear elastic static analysis?

Dear STKO Team:

Thank you for your replay.

I put my *SCD file and user report of ETABS here.

Best regards