In a 'sway frame', the slope-deflection equations include an additional term for:
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Chord rotation ψ = Δ/L (sway) due to lateral deflection of frame
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Correct Answer
B. Chord rotation ψ = Δ/L (sway) due to lateral deflection of frame
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Slope-deflection with sway: M_AB = (2EI/L)(2θA + θB − 3ψ) + FEM_AB where ψ = sway angle = Δ/L (lateral deflection / height). The ψ term represents the chord rotation due to sway. For sway frames: additional equation of horizontal equilibrium ΣH = 0 needed to solve for sway Δ along with joint moment equilibrium equations.
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