Wind pushes on every building the same way — what changes is how the building fights back. Toggle between three systems on the same frame and see why stiffness matters.
Every building needs a system to resist wind and earthquake forces. Shear walls (rigid concrete or masonry panels) are the stiffest — least drift, most restrictive on floor plan. Braced frames (diagonal steel members) are stiff and efficient but block openings. Moment frames (rigid beam-column connections) are the most flexible — maximum architectural freedom, most drift. Many real buildings combine systems.
Stiffness controls drift (how much the building sways). Ductility controls survival (how the building behaves when pushed beyond its elastic limit). Shear walls are stiff but can be brittle. Moment frames are flexible but highly ductile — they absorb earthquake energy through controlled yielding at beam ends. Seismic codes reward ductile systems with lower design forces (the R-factor) because ductile buildings are more forgiving.
Drift limits (H/400 for wind, 0.02h for seismic) often govern member sizing more than strength. A moment frame may have enough capacity to carry the load, but if the building sways too much it damages cladding, cracks partitions, and scares occupants. The drift check is where moment frames get expensive — you end up with larger members not because of stress, but because of stiffness.