2-Story Moment Frame with Panel Zones and RBS Result

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2-Story Moment Frame with Panel Zones and RBS Result

Postby baikunthasilwal » Thu Nov 06, 2014 2:13 pm

I found the different time period and floor displacement response when I check the following website to perform dynamic analysis for two story moment resisting frame with panel zones.

http://opensees.berkeley.edu/wiki/index ... es_and_RBS

First, the time period of the frame is T1=0.00098823 and T2=0.0009789, which are drastically different from the posted results (T1 = 0.81 s and T2 = 0.18 s). Please clarify about this issue.

Next, the displacement response is also significantly different. The analysis shows that the displacement response is 0.138 in and 0.199 in for second floor and third floor.However, the published result in the website are 3 in and 6 in for these floors respectively.

I am curious to know why the response for the frame with panel zones differs significantly compared with the frame without the panel zone. Does the properties of panel zone change the response significantly or is there any other issue that influence the response of the frame?

I am looking forward to receive the response so that the results for time period and displacement response will be acceptable.
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Re: 2-Story Moment Frame with Panel Zones and RBS Result

Postby fmk » Wed Nov 12, 2014 2:03 pm

the difference is due to the new and improved! "Bilin" material .. i am looking at providing the ability to use the old material as a number of people have problems with the new and improved one .. it will be in the new release, out later this week or next.
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Re: 2-Story Moment Frame with Panel Zones and RBS Result

Postby gudipati » Sun May 22, 2016 1:55 pm

I also encountered the same problem as Mr. Bainkuntha Silwal. By looking at the mode shapes using DisplayModel2D.tcl, it appears that the first two modes correspond to local panel zone modes and not the actual building mode.
A similar model using bilin material but without panel zones gives the time period T1=0.82s and T2=0.2s (http://opensees.berkeley.edu/wiki/index ... ment_Frame).

Could someone please confirm if the actual cause of discrepancy is not the bilin material but the above stated reason?

Thanks,
Vamshi Krishna
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Re: 2-Story Moment Frame with Panel Zones and RBS Result

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Re: 2-Story Moment Frame with Panel Zones and RBS Result

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