precast outside wall and cast-in-place inside wall

shear wall structure supported on frame-shear wall

shear wall supported on frame-shear wall structure

arc stair

auxiliary stair

Cantilever Stair

circular stair

corkscrew stair

crane stair

double stair horizontal well

double stepping on one stair

Escape Stair

exterior stair

Fire Escape Stair

fire-escape stair

floor slab with stair steps

halfpace stair

main stair

newel stair