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Sway or Non-Sway Frame?

 
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Dr. N. Subramanian
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PostPosted: Wed Jan 19, 2022 9:30 pm    Post subject: Sway or Non-Sway Frame? Reply with quote

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
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PostPosted: Thu Jan 20, 2022 6:00 am    Post subject: Reply with quote

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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