The dead weight of a stair consists of
- Adead weight of waist slab
- Bdead weight of steps
- Cdead weight of stringer beam
- Dall of the aboveCorrect
Solution
Concept
Components of stair dead weight
Formula
NONE
Step-by-step solution
1. Staircases consist of structural components including waist slabs, steps, landings, and supporting stringer beams. 2. The total dead load of a stair includes the self-weight of all these structural components. 3. Therefore, dead weight of waist slab, steps, and stringer beams all contribute to the overall dead weight. Answer: D
Explanation
The total dead weight of a staircase includes all of its permanent structural components. This encompasses the self-weight of the inclined waist slab, the steps, and any supporting stringer beams included in the design. Therefore, all the listed components contribute to the total dead weight of the stair.
Why the other options are wrong
A) The waist slab is only one structural component of the dead weight. B) Steps represent only a portion of the total stair dead weight. C) The stringer beam is only one element contributing to the overall weight.
Shortcut
Stair dead weight includes all components: waist slab, steps, and stringer beams.
Common mistake
Considering only individual components like the waist slab or steps instead of all supporting components combined.
Correct answer: D) all of the above