2nd Order Effects: Design Example 2 - Sway Frame

This video demonstrates how to determine the 2nd order effects for a sway frame. It includes the calculation of the effective length factor (ke) based on the stiffness ratios at the top and bottom of the columns. It then discusses how the second order effects would be accounted for in design through the use of a second order multiplier to the first order moments as described in the New Zealand steel standard: NZS 3404.

[@algernonwebbe]

Thank you for your video. If the frame were timber, would the procedure be similar?

[@lucasshogan]

The fixity of the end conditions and the gamma values are specific to the experimental rotational stiffnesses of steel members, but the overall accounting for P-Delta actions (i.e. second order effects) should be similar.

[@algernonwebbe]

@@lucasshogan Okay. Thank you. I thought so. If the calculations showed that a second-order analysis is needed, can you point to any resource where an example of actually carrying out a second-order analysis is done (video, text, etc.?)