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The portal and cantilever methods are two approximate methods for analysing tall buildings for lateral (wind or siesmic) loads - nowadays used for preliminary design purposes.

The portal method is suitable for buildings likely to deform in shear mode. It is based on the distribution of base shears proportional to influence areas.

The cantilever method is suitable for slender buildings likely to deform in flexure mode. It is based on distribution of base moment as axial forces on columns proportional to their distance from centroidal axis of the building.

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Q: What is the difference between the portal and cantilever methods in structural design?
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