Abstract
This paper deals with the elastic analysis of clad pitched roof portal frame structures. A practical structure is analysed, first neglecting the stiffening effect of sheeting and then according to the rules of stressed skin design. The differences between both analyses are shown. Different aspects of stressed skin design analysis are investigated, namely: 1. 1. The fact that some vertical loads mobilize the diaphragm effect, whereas others do not. 2. 2. The modification of axial forces in the columns, due to the influence of diaphragm action. 3. 3. The assumption that shear forces are transmitted from sheeting to the eaves of the frames.
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