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Castellated beams In our August column, Mr. A. Billingham posed a problem about the design of these beams in accordance with BS 449, particularly in respect of lateral buckling. Mr. A. D. Weller has responded saying: I am enclosing a copy of a letter sent to Mr. A. Billingham following his question in The Structural Engineer for August 1978. Unfortunately, the answer to his problem would require considerable research work, which may well indicate that castellated beams need restraint at close intervals. Verulam