Portal frames are generally low-rise structures, comprising columns and horizontal or pitched rafters, connected by moment-resisting connections. • Resistance to lateral and vertical actions is provided by the rigidity of the connections and the bending stiffness of the members, which is increased by a suitable haunch or deepening of the rafter sections. • This form of continuous frame structure is stable in its plane and provides a clear span that is unobstructed by bracing. • Portal frames are very common, in fact 50% of constructional steel used in the UK is in portal frame construction. • They are very efficient for enclosing large volumes, therefore they are often used for industrial, storage, retail and commercial applications as well as for agricultural purposes. • This article describes the anatomy and various types of portal frame and key design considerations.
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