Formulas: Consideration of Initial System Imperfections

Formula 1

When second-order effects are such that the maximum sidesway amplification, $\Delta_{2 n d \text {-order }} / \Delta_{1 s t \text {-order }}$ or $B_{2} \leq 1.7$ using the reduced elastic stiffness (or 1.5 using the unreduced elastic stiffness) for all lateral load combinations, it is permitted to apply notional loads only in gravity load-only combinations and not in combination with other lateral loads.

Found in

• CALCULATION OF REQUIRED STRENGTHS