portal frame

noun

1. civil engineering building trades a frame, usually of steel, consisting of two uprights and a cross beam at the top: the simplest structural unit in a framed building or a doorway

Example Sentences

She will have 24 onstage performers, four of her children will also be on stage, and she will transported high up around the arena "in an illuminated portal frame that acts as a time machine".

From Reuters

Prouvé patented his modular building design, based on an axial portal frame, in 1938, and continued to develop his demountable buildings through the ’60s, seeing them function as homes, schoolhouses, offices, and gas stations.

From Architectural Digest