In the design of a dog-legged staircase, the waist slab is designed for:
Choose the correct answer
Live load only (25 kN/m²)
Self-weight of inclined slab + step weight converted to horizontal projection + live load, spanning horizontally
Only self-weight of concrete
Only the live load at the nosing line
Correct Answer
B. Self-weight of inclined slab + step weight converted to horizontal projection + live load, spanning horizontally
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Waist slab (inclined slab of staircase): the inclined slab between landings. Span is the horizontal span (not going length). Total load = (weight of steps + slab self weight) on inclined slab converted to horizontal projection load. Effective span includes going + landing portions. Designed as one-way slab spanning between supports (walls, beams, landings).
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