Column rotation inconsistency
Moderators: silvia, selimgunay, Moderators
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- Posts: 6
- Joined: Sat Jul 29, 2017 6:59 am
- Location: Shiraz university
Column rotation inconsistency
Hi,
I am analyzing a 6-story R.C. MRF. The total height of the building is 18 meters. The problem is that when I push the structure to the roof drift of 3%, column rotations are very small ( in the order of 10^-4). In this case, column to beam ratio moment strength is 5! and when I change this ratio to 1.5, everything becomes normal (column base rotations is consistent with the drift). What might be the problem?
Thanks,
I am analyzing a 6-story R.C. MRF. The total height of the building is 18 meters. The problem is that when I push the structure to the roof drift of 3%, column rotations are very small ( in the order of 10^-4). In this case, column to beam ratio moment strength is 5! and when I change this ratio to 1.5, everything becomes normal (column base rotations is consistent with the drift). What might be the problem?
Thanks,
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- Posts: 913
- Joined: Mon Sep 09, 2013 8:50 pm
- Location: University of California, Berkeley
Re: Column rotation inconsistency
How do you know the column rotations at the bottom? Are the columns pinned at the base?
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- Posts: 913
- Joined: Mon Sep 09, 2013 8:50 pm
- Location: University of California, Berkeley
Re: Column rotation inconsistency
In the case of column to beam ratio of 5, your columns are probably not yielding at the base.
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- Posts: 6
- Joined: Sat Jul 29, 2017 6:59 am
- Location: Shiraz university
Re: Column rotation inconsistency
I used concentrated nonlinear springs developed by Haselton
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- Posts: 6
- Joined: Sat Jul 29, 2017 6:59 am
- Location: Shiraz university
Re: Column rotation inconsistency
if column bases are not yielding, how can a 3% drift be explained without significant rotations in the columns?