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A happy New Year to you all! The Christmas holiday has proved inspirational to a number qf readers... Deflection of portals Mr D. H. Camilleri has written from Malta and is concerned about the vertical deflection of portal frames. He writes: I have often wondered regarding the validity of the ridge deflection dRE quoted in section 11.5 of Manual for the design of steelwork building structures given as: dRE = dE X cot รจ, where dE is the horizontal deflection.