Photograph and video credits

Photographs

A steel building frame under construction, seen from above by Chevsapher, Wikimedia Commons, licensed CC0. Cropped and resized.
Fabricated plate girders with stiffeners, delivered to site by MTA Capital Construction Mega Projects, Wikimedia Commons, licensed CC BY 2.0. Cropped and resized.
Erected steel portal frames of a warehouse by AbyarAfzar, Wikimedia Commons, licensed CC BY-SA 4.0. Cropped and resized.
A blueprint elevation of a tall building by Warner, Burns, Toan, and Lunde architecture firm, Wikimedia Commons, licensed Public domain. Cropped and resized.
Bundles of steel sections stacked in a yard by Shixart1985, Wikimedia Commons, licensed CC BY 2.0. Cropped and resized.
A welder joining steel plates by Alfred T. Palmer, Wikimedia Commons, licensed Public domain. Cropped and resized.
The inside of a steel portal frame building, its columns, rafters and purlins erected by Syibeehive, Wikimedia Commons, licensed CC BY-SA 4.0. Cropped and resized.
Steel frame building under construction in Taiwan by SSJF01, Wikimedia Commons, licensed CC0. Cropped and resized.
I-Träger feuerverzinkt mit Hängeloch by Leo Miregalitheo, Wikimedia Commons, licensed CC BY-SA 4.0. Cropped and resized.

Wabenträger brennen aus IPE450 Stahlträger (A CNC line cutting a castellated beam from an IPE 450 section) by FERROFLEX AG Rothrist, Wikimedia Commons, licensed CC BY 3.0. Shortened to 2 minutes 30 seconds for the lesson and 48 seconds for the trailer, and re-encoded.