A 120 ft clear-span pre-engineered steel warehouse case study — worked rigid-frame gravity reactions, wind and seismic lateral design across two different load paths, column base plate/anchor rod sizing, and spread footing design for the column reactions.
The project brief: a 120 ft x 200 ft pre-engineered steel warehouse at 24 ft eave height needs a complete rigid-frame gravity and lateral system with no interior columns. Tapered built-up rigid frames clear-span the full 120 ft width and resist transverse lateral load through moment continuity, while a separate rod-bracing system carries longitudinal wind and seismic load — two different lateral systems solving two different directions on the same building.
This module walks the whole design the way a real structural engineer would: a gravity load takedown to a 55.2 kip factored column reaction, worked wind and seismic lateral calculations that govern two different structural systems, a base plate/anchor rod design where practical minimums govern over the bearing and tension calculations, and a column spread footing sized against the service-level reaction. The full worked numbers, complete bill of materials, and finished design reasoning are part of the unlocked module below.