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Abstract shape. Due to the current practice the engineers design the structures to be strong enough to fulfil thier functions without necessarily being able to predict the actual failure loads of these structures. The behaviour of the pitched roof portal frames is profoundly effected by the diaphragm action (8, 9). The deflections at the joints are decreased significantly and consequently the bending moments. Thus the elastic critical load plays a good part in determining the failure load. It the aim of this work to determine the actual buckling load for the pitched-roof frames taking into consideration the effect of the cladding and the change in the geometrical |