Search found 5 matches

by Sanaz Ahlehagh
Wed May 12, 2021 12:37 am
Forum: OpenSees.exe Users
Topic: Braced Frame Analysis
Replies: 1
Views: 396

Braced Frame Analysis

Dear All, I have modeled a 2D SCBF based on Vesna Terzic model. When running the 1 story frame it runs correctly, but when I modify it to a 3-story frame, then the pushover analysis does not converge after lateral displacement of about 2cm. If I change the brace material to elastic, there is no conv...
by Sanaz Ahlehagh
Wed Jan 17, 2018 2:50 am
Forum: OpenSees.exe Users
Topic: element type
Replies: 2
Views: 1371

Re: element type

Dear Sir, Please note that in the "beam with Hinges" script given in the link you sent, the plastic hinge stiffness "ks_col" or "ks_beam", is not correct. The stiffness is now: Ks_col=6*E*I_col/Lp_col but shall change to Ks_col=6*E*I_col/L*Lp_col. using forceBeamColumn/HingeRadau and the corrected K...
by Sanaz Ahlehagh
Sat Jan 05, 2008 2:15 am
Forum: OpenSees.exe Users
Topic: Pushover of a Braced frame
Replies: 6
Views: 6435

no there is no special reason, i just want to know the difference! As far as I know, with fiber section only moment and axial loads are considered and using a section aggregator I can also consider the shear in beams. I do not know why it is ignored in most of the example models?! How can I define t...
by Sanaz Ahlehagh
Mon Dec 31, 2007 5:11 am
Forum: OpenSees.exe Users
Topic: Pushover of a Braced frame
Replies: 6
Views: 6435

section aggregator

In the above model I have not used section aggregator for beams, if I do so I will have convergency problems with the pushover analysis, and brace forces will not be correctly predicted.
In section aggregator I just add elastic shear to the fiber section.
Why this happens?
by Sanaz Ahlehagh
Mon Dec 17, 2007 2:27 am
Forum: OpenSees.exe Users
Topic: Pushover of a Braced frame
Replies: 6
Views: 6435

Pushover of a Braced frame

Hello I want to do a pushover analysis for a three storey chevron braced frame. The analysis converges well, but in the base shear-control node displacement curve obtained from the analysis, the base shear keeps increasing through all displacements. while I think this is not correct. I think that it...