Portal frames are a type of structural frame, that, in their simplest form, are characterised by a beam (or rafter) supported at either end by columns, however, the joints between the beam and columns are ‘rigid’ so that the bending moment in the beam is transferred to the columns. This means that the beam can be reduced in sectional size and can span large distances.
Typically, the joint between the beam and the columns is made ‘rigid’ by the addition of a haunch, bracket, or by a deepening of the section at the joints. Portal frames are generally fabricated from steel, reinforced precast concrete, or laminated timber sometimes referred to as ‘glulam’ .
Post time: Jul-18-2022