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Stiffness-Factor Modifications

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Stiffness-Factor Modifications Three cases where moment-distribution process can be simplified 1. Member Pin (or Roller) Supported at Far End carry-over factor = 0 if the far end was fixed supported, the stiffness factor K = 4EI/L would have to be modified by 3/4 to model the case of having the far end pin supported 2. Symmetric Beam and Loading for center span: the center span's stiffness factor will be one half that usually determined using K = 4EI/L 3. Symmetric Beam and Antisymmetric Loading for center span: the stiffness factor is one and a half times as large as that determined using K = 4EI/L Procedure for Analysis draw FBDs of spans and joints   determine distribution factors and fixed-end moments   (click)   identify joints  (free ends are not joints) determine stiffness factor K for each span   (click) K = 4EI/L for far-end fixed K = 3EI/L for far-end pinned or roller supported K = 2EI/L for symmetric span and loading K = 6E
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