The third stabilising mechanism and the one we will explore in more detail in this series of posts is the so-called propped structure scheme, regularly employed in multi-storey frame structures, e.g.
The result of this is that portal frames generally experience larger lateral (sway) deflections than braced frames. Lateral deflection of portal frames is largely dependent on the stiffness of structural joints and also the flexural rigidity of vertical (column) members. In doing so they typically make use of plastic hinge formation. Portal frames are characterised by their ability to span large distances efficiently. large warehouses, agricultural buildings, hangers. Portal frame structures are most often encountered as steel frame structures, e.g.
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