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D Find the most economic column section for AD in the following loading condition. The end "A" of simply supported beam AB rests on the end "A" of AD, which means AD will have to support the load applied on it directly plus the portions of load at A due to beam AB. Assume the loads transferred by the beams AB is vertical and equally divided to two columns. X=6.23 DL(61.20.2x = LL(102+ 0.2x = k) k) A 10.2 + 0.1x = DL: (51.5 +0.1x = LL: (45.6+0.1x = ) k ) k (161.5 +0.5x) k AK B (115.5+0.5x) k (19.10.1x= _) ft. (10.6+0.1x) ft.