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Dr. N. Subramanian General Sponsor
Joined: 21 Feb 2008 Posts: 5538 Location: Gaithersburg, MD, U.S.A.
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Posted: Wed Jan 19, 2022 9:30 pm Post subject: Sway or Non-Sway Frame? |
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Sway or Non-Sway Frame?
ACI 318-19 provides three methods to determine if the lateral stiffness is sufficient to designate the frame as non-sway.
1. Section 6.2.5.1, ACI 318-19: Columns are non-sway if the gross lateral stiffness of the walls (bracing elements) in a story is at least 12 times the gross lateral stiffness of the columns in that story. This is a simple, conservative hand calculation.
2. Section 6.6.4.3(a), ACI 318-19: Columns are non-sway if the increase in column end moments due to second-order effects does not exceed 5 percent of the first-order end moments.
3. Section 6.6.4.3(b), ACI 318-19: Columns are non-sway if the stability index “Q” does not exceed 0.05 as shown in Eq. (6.6.4.4.1): |
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vikram.jeet General Sponsor
Joined: 26 Jan 2003 Posts: 3838
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Posted: Thu Jan 20, 2022 6:00 am Post subject: |
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Very useful information from Dr NS sir. The first criteria can be useful in checking sway / non- sway by hand calculations .
Wish to see a simplified structural engg , It is always better to have an approximate solution to exact problem than an exact solution to approximated problem as stated by an eminent structural expert. |
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