DESIGN OF RCC STAIRS

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• Q1: Define stair.
  Ans: A stair is a structure comprising a series of steps used to move from one floor to another within a building.
• Q2: What is meant by stair spanning horizontally?
  Ans: It refers to stairs supported at the ends and spanning across the width of a space, typically between walls or beams.
• Q3: Define stair spanning longitudinally.
  Ans: It refers to stairs supported along their length, usually by beams or walls running parallel to the direction of the stair flight.
• Q4: Define landing.
  Ans: A landing is a flat platform provided between two flights of stairs or at the top or bottom of a staircase to allow rest and directional change.
• Q5: What is meant by pitch of stair?
  Ans: Pitch of a stair is the angle between the horizontal and the line of nosing of the stair treads, indicating the steepness of the staircase.
• Q6: What is nosing of step?
  Ans: Nosing is the front edge of a stair tread that protrudes over the riser beneath. It enhances safety and aesthetics.
• Q7: Define winder steps.
  Ans: Winder steps are triangular or pie-shaped steps used to change the direction of a staircase without a landing.
• Q8: What are flier steps?
  Ans: Flier steps are the regular rectangular steps in a straight flight of stairs without any directional change.
• Q9: Define soffit of waist slab.
  Ans: The soffit of a waist slab is the underside or bottom surface of the inclined slab that supports the stair steps.
• Q10: What is the difference between going and tread?
  Ans: Tread is the horizontal surface of a step where the foot is placed. Going is the horizontal distance between the face of two consecutive risers.
• Q11: Define riser of step.
  Ans: Riser is the vertical portion of a step between two successive treads in a staircase. It is the place where you place your foot.
• Q12: What is rise of a step?
  Ans: The rise of a step is the vertical height gained in one step, measured from the top of one tread to the top of the next.
• Q13: Define waist slab of stair.
  Ans: Waist is the thickness of the inclined slab in a staircase, measured perpendicular to its slope.
• Q14: What is stringer beam?
  Ans: A stair stringer is an inclined structural member that supports the treads and risers of a staircase. Usually, there are two or three stringers—on either side and sometimes one in the center.
• Q15: Write the formula to calculate breadth of step.
  Ans: Breadth (or going) of a step is calculated using the formula: b = √(T² + R²), where R is the riser and T is the tread.
• Q16: What is the minimum thickness of the waist slab?
  Ans: The minimum thickness of a waist slab is typically 3 inches or 7.62 cm.
• Q17: Define flight.
  Ans: A flight of stairs is a continuous series of steps without any landing that connects two different levels in a building.
• Q18: Define headroom.
  Ans: Headroom is the vertical distance measured from the top surface of a tread to the ceiling directly above it.
• Q19: Define handrails or guardrails.
  Ans: A handrail or guardrail is a safety railing provided along staircases to offer support and prevent falls while ascending or descending.