Consideration of Secondary Effects in Frame Design

by Francois Cheong-Siat-Moy, (A.M.ASCE), Asst. Prof. of Civ. Engrg.; Dept. of Civ. and Mineral Engrg., Univ. of Minnesota, Minneapolis, Minn.,

Serial Information: Journal of the Structural Division, 1977, Vol. 103, Issue 10, Pg. 2005-2019

Document Type: Journal Paper


The contributions to the P-Δ moments of such sources as semirigid connections, initial-story eccentricity, column-axial shortening, and panel zone deformation can be calculated and included in the preliminary design of multistory steel frames. For all practical purposes, the second-order effects are equal to the first-order values multiplied by an amplification factor which is a function of the story stiffness. It is shown that all these sources can significantly reduce frame stiffness to the point of causing damage to light partitions and windows.

Subject Headings: Frames | Steel frames | Steel columns | Stiffening | Moment (mechanics) | Connections (structural) | Panels (structural) | Deformation (mechanics)

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